JP4366515B2 - Rolling method and rolling machine - Google Patents

Description

  The present invention relates to a rolling method and a rolling mill, and more particularly to a rolling method and a rolling mill for producing a thin metal plate.

  In Patent Document 1, in a one-stand multi-pass rolling mill, which includes three or more work rolls in one stand, and at least one of the work rolls simultaneously rolls a rolled material at two or more points. / The work roll of the stand is arranged, the driving device is provided on the two outer work rolls, and the drawing roll is installed so that at least the rolling work material is wound around the drive work roll. A one-stand multi-pass rolling mill is described. Furthermore, in a one-stand multi-pass rolling method in which three or more work rolls are provided in one stand, and the rolled material is simultaneously rolled at two or more points by at least one of the work rolls, four arranged / stand works Among the rolls, when driving the outer two rolls, and rolling and rolling at least without rolling the rolling material around the driven work roll, the different speed ratio of the driven work roll (high speed driving side work roll speed / A one-stand multi-pass rolling method in which the low-speed drive side work roll speed) is 2.0 to 3.5 is described.

  In Patent Document 2 cited in Patent Document 1, three or more work rolls are arranged in a row so as to form a rolling pass with adjacent work rolls, and work rolls closer to the exit side of the rolling mill. The peripheral speed of the work roll is controlled so as to increase the roll peripheral speed, and a metal strip is wound around the semi-circular circumference of the work roll between the work rolls on both sides, and the rolling pass is continuously passed through. In the first roll, the low-speed work roll is driven so that the ratio of the strip entry speed to the peripheral speed of the low-speed work roll is 0.8 to 1 in the first pass, or The low-speed side work roll is not driven, and the ratio of the strip discharge speed from the pass to the peripheral speed of the high-speed side work roll is 0.8 to 1.2 in the remaining passes. There are, and rolling method for metal strip the peripheral speed of the high speed side work roll at least one pass to drive the work rolls to be higher than the strips release rate from the path is described.

Patent Document 3 refers to different peripheral speeds.
Patent Document 4 describes different peripheral speed setting means (circuit) for setting different peripheral speeds of the upper and lower rolling rolls.

  In Patent Document 5, in a continuous rolling mill in which a plurality of rolling mills are continuously arranged and rolled, the ratio of the inlet side plate thickness and the outlet side plate thickness of the rolling mill is substantially equal to the peripheral speed ratio of the upper and lower work rolls. In addition, a continuous rolling mill is described in which a differential rolling mill that performs rolling so that the front tension is larger than the rear tension is provided in the final stand.

  Patent Document 6 has at least two work rolls, and rolls the material by rotating adjacent work rolls at different peripheral speeds in the opposite direction, and winds the material around the work rolls. A rolling mill that is configured to be rolled and provided with a reinforcing roll that supports a rolling pressure on each of the work rolls, and a groove portion through which a material wound around the work roll passes is provided at the center of these reinforcing rolls. Has been.

  In Patent Document 7, two non-driven small-diameter work rolls are arranged between two large-diameter work rolls driven in opposite directions so that their rotational axes are substantially in the same plane as the drive work rolls. A strip rolling machine is described in which the small-diameter work roll is clamped by a reinforcing roll. According to the present rolling mill, effects such as single-sided roll driving, different-diameter roll rolling, or different peripheral speed rolling can be obtained. It describes what you can do.

Japanese Patent Laid-Open No. 6-4163 Japanese Patent Publication No. 60-49044 JP-A-60-213301 JP 61-242713 A Japanese Patent Laid-Open No. 61-14005 JP 59-18126 JP-A 61-20603

In recent years, the demand for copper alloys containing pure copper and extremely thin stainless steel plate materials has been rapidly increasing. The one with low deformation resistance such as aluminum foil has been produced by a simple four-high rolling mill with 10μ2 stacked, and 5μ has been produced for a long time, but when it is harder than that, the deformation resistance is 2 It is a difficult problem because it is around 10 times.
For that purpose, it has been necessary to make the roll diameter extremely small, and a 20-high rolling mill represented by a Sendier mill that can use a small-diameter work roll has been indispensable particularly for rolling stainless steel or the like.
Still, it is not enough to meet the industry's needs of producing ultra-thin plates.

The present invention makes it possible to produce a thin plate with a four-high rolling mill using a large-diameter work roll (a concept including a four-high rolling mill or more; the same applies hereinafter).
The present invention is particularly stable for a rolling of a thin metal plate, particularly with a four-high rolling mill having a simple configuration, that is, the plate tension can be appropriately applied in consideration of the relationship with the rolling load. It is in providing the rolling method and rolling mill which can produce the ultra-thin board which was difficult to manufacture conventionally.

First, Formula 1 shows the minimum sheet thickness that can be rolled by the conventional rolling method.

As an example, starting from a thick material made of stainless steel, for a final thickness of about 10μ, the total rolling reduction exceeds 80% and S = 180 kg / mm ² . When winding a tension reel, it is usually about 40 kg / mm ² , but when this is 50 kg / mm ² , h _min is as follows.

h _min = 17 × μD (180-50) × 10 ⁻⁵
= 17 × μ × 130D × 10 ⁻⁵
In the case of mineral oil used for stainless steel rolling or the like, the problem μ decreases as the rolling speed increases and the roll diameter increases.
When the rolling speed is 600 m / min or more, it is estimated that μ = 0.04 when the large-diameter roll is about 200 mm or more, μ = 0.05 when 50 mm, and μ = 0.06 when 20 mm.

When appropriate, when D = 50 mm,
h _min = 17 × 0.05 × 50 × 130 × 10 ⁻⁵ = 0.055 (mm)
When D = 20mm,
h _min = 17 × 0.06 × 20 × 130 × 10 ⁻⁵ = 0.0265 (mm)
However, with a small-diameter roll, the roll cooling capacity cannot withstand high-speed rolling, which may cause seizure. Increasing the viscosity of the oil is effective in reducing μ, but conversely the cooling capacity of the roll decreases.
In any case, it can be said that it is extremely difficult to roll a stainless steel plate to 20 to 30 μm or less, 10 μm, or in some cases 5 μm in the conventional method.

  On the other hand, the method of the present invention theoretically has no limit on the minimum sheet thickness that can be rolled by a simple large-diameter rolling mill. Its basic principle is the different speed rolling by a two-high rolling mill developed in the Soviet Union around 1975. This idea was also applied in Japan. However, although the roll diameter was too large in a two-high rolling mill, development with a multi-high rolling mill having four or more stages was performed, but it has hardly been practically used. Although there are various reasons, the present invention provides a solution to solve the problem.

Hereinafter, the principle will be described using a known rolling theory.
If the Young's modulus E of the rolling roll is infinite and the friction coefficient μ between the rolling roll and the rolled material is zero, the rolling load P per 1 mm of the sheet width is the constraint deformation resistance of the material as S (kg / mm ² ) If the front and rear plate tensions are σ _td and σ _te and the average of both is σ _tm , the work roll diameter D and radius R are

However, since the Young's modulus E of the roll is not infinite in practice, the radius R of the roll surface of the roll on which the material is rolled increases to R ′ due to elastic deformation. The relational expression is that the E of the roll is 2.1 × 10 ⁴ kg / mm ²

実際は、ロールと圧延材間の摩擦係数μは零ではないのでＰは更に増加する。この数式４は、新しく見つけ出したものであり、μ＝０の場合はＰはこの式によって求めることが出来る。μの影響について以下述べる。圧延理論によれば

として

すなわち、μのためにＰは

倍に増加する。これを圧力増加係数（Ｐ．Ｍ．Ｆ）と呼んでいる。 Than this

Actually, since the friction coefficient μ between the roll and the rolled material is not zero, P further increases. This formula 4 is newly found, and when μ = 0, P can be obtained by this formula. The influence of μ is described below. According to the rolling theory

As

That is, for μ, P is

Doubled. This is called the pressure increase coefficient (PMF).

とするのが妥当である。このＰ．Ｍ．Ｆがどの程度かを見るのに適当なデータがある。それは純銅の圧延で２０μから１２μに圧延するのに１２０ｍｍの作業ロール径で７００ｍｍの板幅の場合、約５０Ｔｆの圧延荷重を要していることである。 Although h _m at this time is the mean value of h _d and h _e, than that the outer shape of the roll is circular,

Is reasonable. This P.I. M.M. There is appropriate data to see how much F is. That is, a rolling load of about 50 Tf is required for a plate width of 700 mm with a work roll diameter of 120 mm to roll from 20 μm to 12 μm by rolling pure copper.

となる。
すなわち、μのため圧延荷重が７倍になっているが、μ＝０ではＰが減り、Ｒ′は更に減少するため更に圧延荷重は減少する。 At this time, the load per 1 mm width P = 50 × 10 ³ /700=71.4 kg / mm
At this time, Δh = 20−12 = 8 μ, and R ′ is

It becomes.
That is, although the rolling load is 7 times due to μ, when μ = 0, P decreases and R ′ further decreases, so the rolling load further decreases.

Thus, in general rolling, it is extremely troublesome to obtain a rolling load because of the friction coefficient μ. In this example, it is good because the rolling load is known, but in general, an unknown rolling load is obtained by calculation. This is related to the flat deformation of the roll and the coefficient of friction, and it is extremely troublesome to obtain exactly. When this is set to μ = 0, it can be said that it can be obtained by an extremely simple mathematical formula 4 and is an extremely valuable discovery in industry.
The correctness of this equation was verified by an experimental mill.

  As mentioned above, although the harm of friction was described, it is useful for general rolling. There are generally two reasons for using rolls to roll metal sheets. One is that if it is an annealed material by simply pulling to extend the plate, it is possible to stretch around 30%, but the elongation of the work-hardened material is extremely reduced, so in general not only tension but also pressure is applied. The addition is to prevent plate breakage. That is, the roll plays the role of a continuous press. The other is to give the material plastic deformation energy by the frictional force between the roll and the material.

だけ速くなる。それに対してロールの周速は一定であるため、中立点の一点を除いてロールと材料は滑る。中立点より入口側はロールが材料に引張力を与え、逆に出口側はブレーキ作用を与え、この差で圧延に必要なエネルギを与える。 Depending on the rolling reduction rate γ, the outlet side speed is higher than the inlet side speed.

Only get faster. On the other hand, since the peripheral speed of the roll is constant, the roll and the material slide except for one point of the neutral point. On the inlet side from the neutral point, the roll gives a tensile force to the material, and on the contrary, the outlet side gives a braking action, and this difference gives the energy required for rolling.

  Therefore, when the frictional force is zero, the rolling energy cannot be applied to the plate material from the roll. Therefore, in that case, the rolling energy can only be given by the tension difference between the entrance and exit of the plate. In reality, it is extremely difficult to make the friction coefficient zero, so even if there is a friction coefficient, the method of eliminating the influence is the PV method.

とされる。（尚、ここで ｌ は小文字のエルを示す。）
Ｓ_eは平均拘束変形抵抗で圧延前のＳ＝Ｓ₁、圧延後をＳ₂とすると近似的に

で示される。 The PV method is a different peripheral speed rolling method in which one of the rolls to be rolled is matched with the outlet speed of the rolled material and the other roll speed is matched with the inlet side of the rolled material. Therefore, the neutral point of the faster roll is located on the outlet side of the roll, and the neutral point of the slower roll is located on the inlet side of the roll. As described above, since the neutral point does not exist in the contact length between the rolled material and the roll, the phenomenon that the rolling material receives a compressive stress by the frictional force and the deformation resistance becomes large disappears. Instead, the frictional force applied to the plate material by the pair of work rolls is zero and the rolling energy cannot be given by the rolls. Therefore, this energy supply is due to the difference in winding tension between the front and rear, and the relationship is based on the theory of plastic energy.

It is said. (Here, l is a lowercase letter L.)
_Se is an average constrained deformation resistance, and is approximately when S = S ₁ before rolling and S ₂ after rolling.

Indicated by

で、Ｒに比べΔｈが小さい時はθ／２μは１に比べ微小になるので近似的にφ≒θ／２となる。
この場合、材料は中立点に向けてμＰの圧縮力を受けるので圧延材の板厚をｈとすれば圧縮応力σ_cが発生する。

となる。
厳密にはこのμＰは接触長の中で一定でなく中立点に向かって増大する。 Here, the difference in characteristics between the normal rolling method and the different peripheral speed rolling method will be described.
In FIG. 1, FIG. 1 (A) shows a normal rolling method, and FIG. 1 (B) shows a different peripheral speed rolling method. FIG. 2 shows the relationship between the velocity V and the frictional force μP in these methods. FIG. 2 (A) corresponds to FIG. 1 (A) and FIG. 2 (B) corresponds to FIG. In these figures, φ is a neutral angle, and a neutral point is indicated by φ. At this angle φ, the peripheral speed of the roll coincides with the speed of the material. Here, V _e is the inlet side speed of the rolled material, V _d is the outlet side speed, V _Rt is the high speed side roll speed, and V _Rb is the low speed side roll speed.

Thus, when Δh is smaller than R, θ / 2μ is smaller than 1, so approximately φ≈θ / 2.
In this case, since the material receives a compressive force of μP toward the neutral point, a compressive stress σ _c is generated if the thickness of the rolled material is h.

It becomes.
Strictly speaking, this μP is not constant in the contact length but increases toward the neutral point.

This σ _c increases as the plate thickness decreases. In general, when the tension is applied, the rolling load is reduced. On the contrary, this σ _c increases the rolling load. As a result, the roll radius is increased due to the flat deformation of the roll, and P is further increased. _c increases further and eventually rolling becomes impossible. As this phenomenon is shown by the theoretical formula of Formula 1, the minimum sheet thickness that can be rolled is proportional to μ.

  In order to eliminate this restriction, there is no choice but to make μ zero or make the work roll diameter D as small as possible. Since μ cannot be made zero, in reality, complicated and expensive rolling mills for reducing the diameter of the work roll have been used for many years. On the other hand, although μ cannot be zero, it is equivalent circumferential rolling to make μ = 0 equivalently.

  That is, the peripheral speed ratio of the upper and lower rolls is set corresponding to the rolling reduction, the roll peripheral speed on the high speed side is set to be higher than the outlet side speed of the plate, the roll on the low speed side is set to be lower than the inlet side speed of the plate, and the neutral point is And not in the contact area of the material.

となる。 By doing so, the following two effects occur.
1) The frictional forces of the upper and lower surfaces of the rolled material cancel each other in opposite directions, and no compressive stress in the rolling direction is applied to the rolled material. In other words, the rolling load increases due to the effect of friction, and there is no limit to sheet rolling.
2) The frictional force opposite to the upper and lower surfaces does not cause compressive stress, but this force gives a shearing force to the material. As a result, the constraining deformation resistance of the material is reduced to 1/1 + μ. That is, the equivalent constraint deformation resistance Se is

It becomes.

  Thus, it can be said that this different circumferential speed rolling PV method is an extremely excellent method for rolling a thin plate. However, why has this PV rolling method been announced and has not been successfully put into practical use after more than 25 years? The theory is good, but there is a problem with the implementation method. The present invention solves that problem.

とし、Ｔ_eとＴ_dは制御された張力である。その時の条件は次の二式の条件を同時に満足させる必要がある。

FIG. 3 shows a conventional PV method. Here, B represents the plate width, and R represents the work roll radius.
If PV rolling is performed in FIG. 3, it is assumed that rolling is performed at a reduction ratio γ.

And _Te and _Td are controlled tensions. The conditions at that time must satisfy the following two conditions simultaneously.

First, it is necessary to know the value of the constraint deformation resistance S in order to satisfy the condition of the expression [1], but it is difficult to know an accurate value because it changes depending on the cumulative rolling reduction rate. Furthermore, even if σ _td −σ _te is kept at a predetermined value, the rolling load P is greatly changed by σ _td + σ _te , so that setting of the rolling load is extremely difficult. That is, it is considered that the setting of the tension and the rolling load is extremely difficult, and this is the biggest reason why the practical use cannot be realized.

In the present invention, a four-high rolling mill is used, and a device is added to the setting of the rolling load. The specific numerical calculation will be described in a specific example described later. If the rolling load is low, σ _td −σ _te remains constant and σ _td + σ _te rises to meet the rolling load and the rolling load is too high. The tension drops and balances with the rolling load. The allowable range is quite wide, but the tension is measured so that the tension does not become too large and the tension on the inlet side does not disappear, and if the tension is too high, the rolling load is increased, and conversely the tension is too low. For example, the rolling load may be set low, and the operation becomes extremely easy.

  The philosophy of the present invention is shown in each claim, but simply speaking, the role of the rolling roll is to prevent the plate breakage due to the tension alone and to prevent the unnecessary reduction of the rolling force due to the friction between the roll and the material. It has the role of applying pressure, regulates the elongation rate of the plate by tension control resulting from speed control, that is, the reduction rate, and gives the energy necessary for plastic deformation of the plate by the difference in tension.

  The present invention uses a rolling machine having four or more stages provided with a set of work rolls and a set of reinforcing rolls for reinforcing the work rolls, and performs rolling while changing the peripheral speed of both work rolls. Basically, a four-high rolling mill equipped with a pair of upper and lower work rolls and a pair of reinforcing rolls that reinforce the upper and lower work rolls is used, the peripheral speed of the work rolls is changed, and the inlet side plate speed is changed to the low speed side work. Rolling is performed with the peripheral speed of the roll and the plate speed on the outlet side matched with the peripheral speed of the high speed work roll. Here, “match” is used to mean “basically dependent on matching”. The roll peripheral speed can be slightly faster on the outlet side than the plate speed and can be slightly slower on the inlet side. The amount is appropriately selected. In addition, a four-high rolling mill provided with a set of work rolls and a set of reinforcing rolls that reinforce the work rolls is used to perform rolling while changing the peripheral speed of both work rolls. Here, also in the solution means, the four-high rolling mill is used in a concept including a four-high rolling mill or more. In the case of a six-high rolling mill, an intermediate roll is used between the work roll and the reinforcing roll. In this case, the intermediate roll is a meaning of the reinforcing roll.

In this case, both work rolls are driven at different peripheral speeds, and the rolling material passes through the rolling material so that it passes between the low-speed work roll and the other reinforcing roll (B ₁ ) before passing between the work rolls (A). For example, it is configured to pass between the work rolls (A) through the space between the low speed side work roll and the reinforcing roll (B ₁ ) and then between the high speed side work roll and the reinforcing roll (B ₂ ). By driving the work rolls at the different peripheral speeds while applying the rolling load to B ₁ , A, B ₂ , different speed rolling is performed at A, and the rolling material speed on the inlet side is set to the peripheral speed of the low speed work rolls, and on the outlet side. The speed is synchronized with the peripheral speed of the high speed work roll. The frictional force at B ₁ and B ₂ works to eliminate the neutral point at point A. That is, the influence of friction on rolling is eliminated by removing the neutral point from the contact arc with the rolling mill between the two work rolls (A). Thereby, the width of the rolling material between the work rolls and the width of the rolling material passing through the work roll and the reinforcing roll coincide with each other by winding the rolling material on the work roll and the reinforcing roll, and the work roll by the reinforcing roll Bending is eliminated and good flat rolling is possible. Incidentally, there is a fact that the deformation resistance is lowered to 1.15 by this. And this was proved by experiments.

Such a work roll and reinforcing roll configuration is such that the plate tension on the outlet side and the inlet side depends on the rolling load, respectively, and the difference in plate tension between the outlet side and the inlet side becomes autonomous from the rolling load. The rolling energy is supplied by the difference between the outlet side and the inlet side at the point A of the plate tension, so that the rolling material is made into a thin plate by the rolling roll composed of a large-diameter work roll and a reinforcing roll, in particular, extremely thin. It can be rolled into a plate material.
Further, by synchronizing the speed of the rolling material with the peripheral speed of the work roll, the difference in plate tension is made autonomous as will be described later.

  Here, “synchronized with the peripheral speed” is a concept including automatically adjusting the speed of the rolling material to the peripheral speed of the work roll by the action of a rolling load as will be described later. In some cases, a slight speed difference margin can be allowed in practice.

The present invention uses a rolling mill having at least a four-stage roll configuration of a set of work rolls and a set of reinforcing rolls for reinforcing the work rolls, and further uses this rolling mill to change the peripheral speed of both work rolls. In a rolling mill and a rolling method for performing rolling,
Both work rolls are driven at different peripheral speeds by different peripheral speed drive devices to operate as a high-speed work roll and a low-speed work roll, respectively, and before the rolling material passes between both work rolls (A), It is hung so that it passes between the reinforcing rolls (B ₁ ) to reinforce this, and after passing between both work rolls (A), it is hung so that it passes between the high speed side work roll and the other reinforcing roll (B ₂ ). The rolling load is applied to points A, B ₁ and B ₂ by the machine, and the rolling material speed on the inlet side is set to the peripheral speed of the low-speed work roll and the rolling material speed on the outlet side is increased by the frictional force at points B ₁ and B _2. Influence of friction on rolling by regulating rolling reduction ratio of rolling material by peripheral speed ratio of upper and lower work rolls by synchronizing with side work roll peripheral speed and removing neutral point from contact arc with rolling material at point A Disappears and is extremely thin with a large diameter work roll. The provides a rolling method by rolling mill and the rolling mill with a 4-stage roll arrangement consisting of the aforementioned work roll and backup rolls, characterized by rolling.

  In the above rolling mill and rolling method, the energy required for rolling is given by the difference between the exit side tension and the entrance side tension at point A, and this tension difference is autonomously constant from the rolling load. It is determined by the tension value on the entry / exit side, and when the rolling load is changed, the tension on the entry / exit side automatically corresponds to this, and the rolling load is selected arbitrarily within the allowable value of the tension on the entry / exit side. Good.

  In the rolling mill and the rolling method described above, the rolling load allowable range is set such that the lower limit value of the rolling load depends on the outlet side plate tension, the upper limit value depends on the inlet side plate tension, and the rolling load is within the rolling load allowable range. In this case, it is possible to be autonomous with respect to a difference in plate tension between the outlet side and the inlet side.

  In the rolling mill and the rolling method described above, the upper and lower work rolls may be shifted in opposite directions in the roll axis direction so that the end portions of the rolling material coincide with the roll end portions of the upper and lower work rolls, respectively.

  In the rolling mill and the rolling method described above, the upper and lower reinforcing rolls of the upper and lower work rolls may be opposed to each other in the roll axial direction, and the work roll to be reinforced may be shifted in the opposite direction from the roll shift direction. .

  The rolling mill and the rolling method described above are configured such that a bridle roll is juxtaposed on the side of the work roll and the rolling material is hung on the bridle roll, and a tension meter is installed on the bridle roll, respectively. The rolling load tolerance range limit can be measured.

  A rolling material can be rolled into a thin plate, particularly into an extremely thin plate material, by a four-high rolling mill in which a rolling load acts between the work roll and the reinforcing roll and between the work rolls. The rolling material speed is synchronized with the peripheral speed of the low speed work roll, the outlet side speed is synchronized with the peripheral speed of the high speed work roll, and the rolling load acts between the reinforcing roll and the work roll. The speed is synchronized with the peripheral speed of the work roll, the material (A) between the work rolls is in a state where the difference in plate tension is autonomous, and the rolling load does not substantially affect the rolling reduction. Rolling energy is supplied by the difference between the outlet side and the inlet side. Thus, the rolling load becomes autonomous from the rolling reduction. Therefore, the rolling reduction can be set only by the peripheral speed ratio of the work roll. Then, the rolling load is set within an allowable range, and a constant rolling reduction operation can be performed.

  Embodiments of the present invention will be described below with reference to the drawings.

The basic form of the embodiment of the present invention is shown in FIG. This example will be described.
In this drawing, a rolling mill 100 includes a set of upper and lower work rolls 2 and 3 and a set of upper and lower reinforcing rolls 4 and 5 for reinforcing them, which are accommodated in a housing 20, and a rolling load is applied by a reduction device 21. This is a four-high rolling mill. In this example, a four-stage roll configuration is adopted, but the reinforcing rolls 4 and 5 are two-stage rolls including an intermediate roll, that is, a rolling mill having a roll configuration of six or eight stages as a whole. It is not excluded.

  Work roll drive spindles 6 and 7 are attached to the work rolls 2 and 3, respectively, and a work roll drive system is adopted.

  Different speed gears 8 and 9 are attached to the work roll drive spindles 6 and 7, respectively, and speeds based on a speed ratio determined by the gear ratio of the different speed gears 8 and 9 are applied to the work rolls 2 and 3, respectively. One speed gear 9 is connected to a motor (electric motor) as a drive source. In this example, the speed ratio by the different speed gears 8 and 9 is set to a predetermined speed ratio, and the set speed ratio is applied to the work rolls 2 and 3.

  A bridle roll 15 is installed on the side of the upper work roll 2, and a bridle roll 16 is installed on the side of the lower work roll 3, and tension gauges 17 and 18 are attached to the respective bridle rolls 15 and 16.

  Then, the metal plate 1A is unwound from the unwinder 11, and sequentially between the reinforcing roll 5 and the work roll (inlet side work roll) 3, between the outer periphery of the bridle roll 15, between the work rolls 2 and 3, and the bridle roll 16 , Between the reinforcing roll 4 and the work roll (exit side work roll) 2, rolled between them, and taken up by the winder 12.

  A deflector roller 13 is disposed in the vicinity of the unwinder 11, and a deflector roller 14 is disposed in the vicinity of the winder 12.

As described above, the work rolls 2 and 3 are driven at different peripheral speeds, and the metal plate 1 passes between the work rolls (B ₁ ) between the work rolls (B ₁ ) and the work rolls (B ₁ ). After passing through A), it is configured to pass between the high-speed work roll (for example, work roll 2) and the reinforcing roll (B ₂ ). There are various ways to pass this.

The work roll is driven at different peripheral speeds by applying a rolling load to points B ₁ , A, and B ₂ by the reduction device 19. Kotosoku rolling at point A, B ₁ and B to the peripheral speed of the inlet side of the metal plate (1A) rate lower speed work roll by frictional forces at _two points, the outlet side of the metal plate (1B) speed high speed side work roll Synchronize with the peripheral speed. After passing through the reinforcing roll 5 and the work roll 3, the metal plate 1 </ b> A enters between the work rolls 2 and 3, and when it exits the work rolls 2 and 3, it passes between the reinforcing roll 4 and the work roll 2. The work rolls 2 and 3 constituting the upper and lower passing points are in common with the work rolls 2 and 3 performing the rolling action, so that the work roll peripheral speed is naturally determined. At the point A, the neutral point described above is set as the outside of the θ angle (including the θ angle itself) shown in FIG. 1 (B), so that the presence of the neutral point disappears, and accordingly, the friction of the rolling is reduced. The effect disappears.

The speed of the metal plate 1 is adjusted between the work rolls 2 and 3 by the above-described tuning to the peripheral speed of the work roll and the configuration of the four-high rolling mill in which the rolling load is applied to the reinforcing rolls 4 and 5 in contact with the metal plate 1. As shown in FIG. 4B, the difference in plate tension acting on the side and the exit side is balanced with the applied rolling load at that time, as shown in FIG. In FIG. 4 (B), the value of σ _td −σ _te is constant, does not depend on the rolling load P, and is autonomous. The allowable range of rolling load is set by the maximum value of σ _td and the minimum value of σ _te , and details will be described later.

を満足することである。これだけでは差が決まるだけで絶対値は定まらない。
２つめの条件；
１ｍｍ幅当りの圧延荷重をＰとすれば、

The autonomous action of plate tension and rolling load will be described. The plate tension does not directly control itself, but is automatically determined when the following two conditions are met.
First condition;
When σ _td and σ _te are the exit side and entrance side tension of the rolled material, and S is the average deformation resistance of the material (both kg / mm ² ),

Is to satisfy. This alone will determine the difference and not the absolute value.
Second condition;
If the rolling load per 1 mm width is P,

である。
Ｓ，Ｒ（ロール半径）、Δｈ（圧下量）は一定なので、

となる。数９より、

数８より、

となる。これを数１１に入れて

を得る。また、

より

を得る。すなわち、数８と数１１の関係より、σ_tdとσ_teは特定され、その値は圧延荷重Ｐによって決まることになる。 In addition,

It is.
Since S, R (roll radius) and Δh (rolling amount) are constant,

It becomes. From Equation 9,

From Equation 8,

It becomes. Put this in Equation 11

Get. Also,

Than

Get. That is, σ _td and σ _te are specified from the relationship of _Equations 8 and 11, and the values are determined by the rolling load P.

ＰはΔｈの増減によって増減し、σ_td＋σ_teの増減によって減増する。
すなわち、

である。逆にΔｈは、Ｐの増減によって増減する。 Specific examples are shown in FIGS. 5 (A) and 5 (B). The reason why the plate tension is kept at a value suitable for the load even when the rolling load is changed and the rolling reduction is kept constant will be explained.
Equation 9 is in the form of Equation 14

P increases and decreases as Δh increases and decreases as σ _td + σ _te increases and decreases.
That is,

It is. Conversely, Δh increases or decreases as P increases or decreases.

In FIG. 6, it is assumed that the rolling load P is reduced from a certain PV state. Then, Δh, that is, the rolling reduction γ tends to decrease.
Here, V _Rt is a high-speed roll peripheral speed, VR _b is a low-speed roll peripheral speed, V _s is a rolling material speed, V _s ′ is a decrease in P, and a virtual speed when Δh and γ are decreased.
In this case, assuming that the outlet speed is constant, if Δh, that is, γ decreases due to a decrease in P, the inlet speed V _{e of the} plate _{tends to be} higher than V _Rb . If it is always set to V _e = V _Rb , σ _te becomes larger than the tension in the set state, and naturally σ _td also becomes larger, and both values are autonomously adjusted to the tension that balances the new low rolling load. Fit.

As shown in FIG. 5B, σ _td and σ _te are parallel and the difference between them is constant within the allowable range of rolling load determined from the risk of sheet breakage and the occurrence of sagging of the sheet, In other words, the rolling reduction is constant during this period (even if it deviates from this range, it is constant as shown in the figure, but cannot be adopted in an actual machine). That is, even if the value of σ _td + σ _te increases, the rolling reduction is kept constant. When the rolling load is set within the allowable range, σ _td −σ _te , σ _td + σ _te, that is, σ _td , σ _te are uniquely determined. In this invention, the said characteristic is utilized for rolling of a 4-high rolling mill.

Furthermore, what should be noted is the discovery that an allowable range exists in the range of the applied rolling load as shown in FIG. Depending on the conventional method, if the rolling load is changed, the rolling reduction is immediately affected, and the range in which the plate tension and the rolling load should be satisfied is only one point. Therefore, this is not a range, indicating that control is extremely difficult. However, according to this embodiment, the risk of sheet breakage, which is another factor, and the rolling load allowable range that can avoid the phenomenon of sagging of the sheet can be avoided without considering the influence of the rolling reduction. In other words, the rolling load can be handled by excluding the factor of the rolling reduction, and it becomes extremely easy to apply the rolling load.
In the rolling load allowable range, the lower limit value is determined depending on the plate tension σ _td on the outlet side, and the upper limit value is determined depending on the plate tension σ _te on the inlet side.

Ｂ₁点およびＢ₂点は４段圧延機における板速規定点である。すなわち、これらの点での規定で圧延材料速度の作業ロール２，３周速への自律的同調がなされる。 FIG. 5 shows the dependence and autonomy of the plate tension on the rolling load P. In FIG. 4A, point A is a different speed rolling point between the work rolls 2 and 3, and the peripheral speed ratio of the work rolls 2 and 3 and the reduction rate γ have the following relationship.

₁ point and B ₂ points B is a plate-speed prescribed point in 4-high rolling mill. That is, the autonomous tuning of the rolling material speed to the work rolls 2 and 3 peripheral speeds is made in accordance with these points.

As shown in FIG. 5A, the values of σ _td and σ _te are automatically determined according to P. That is, the individual values of σ _td and σ _te are determined depending on P. In other words, P can be determined from the settings of σ _td and σ _te . As shown in FIG. 5B, the value of σ _td −σ _te is a constant value, and is constant regardless of the increase or decrease of the rolling load P. That is, σ _td −σ _te is autonomous with respect to P.

となる。および、

となる。故に、
σ_td＝σ_te＋４５（kg／mm²）
となる。板幅Ｂが２００ｍｍの場合、圧延荷重Ｐは２５〜４６Ｔｆとなり、安全をみても３０〜４５Ｔｆとなって、１．５倍の裕度がある。 A calculation example is shown below. Assuming that the work roll diameter is 130 mm, he = 0.1 mm, γ = 30%, the constraint deformation resistance S is 150 kg / mm ² and μ = 0.04, the effect of 1.15 and the friction effect described above. , The constraint deformation resistance Se is

It becomes. and,

It becomes. Therefore,
σ _td = σ _te +45 (kg / mm ² )
It becomes. When the plate width B is 200 mm, the rolling load P is 25 to 46 Tf, which is 30 to 45 Tf for safety reasons, and has a margin of 1.5 times.

Incidentally, the tension may provide a frictional force at _two points B by raising the 25Tf to 30Tf is required plate tension sigma _td increases and decreases, a margin is increased.
By providing tension meters on the bridle rollers 15 and 16, the magnitudes of σ _te and σ _td can be adjusted by P.

Next, the reason for the work roll drive will be described. Assuming that the required torque on the high speed side with a large torque is T ₂ , the torque of μPR works at point A, and Bh _d · σ _td · R acts as the transmission torque due to the frictional force at point B ₂ .
T ₂ = μPR + Bh _d σ _td R
It is. If only the reinforcing roll is driven, the force transmitted to the plate is μP,
μP <μP + Bh _d σ _td
And power is insufficient. That is, only the reinforcing roll drive does not hold as in the above formula, and the complete PV does not hold. Working .mu.P at the point A in the roll drive corresponds with directly driven, as long as μP> Bh _d σ _td, can support only the work roll drive.

The allowable rolling load range can be determined by setting a limit value with the risk of fracture of the rolled material and the risk of occurrence of sagging of the rolled material as the minimum limit value or the maximum limit value, and the set limit value. Therefore, as shown in FIG. 4A, the maximum of σ _td or the minimum of σ _te set by providing the tension meters 17 and 18 is set, and the rolling load is controlled within the allowable rolling load range. Can be done easily.
Therefore, even when a large work roll such as a four-high rolling mill is used, the metal plate 1 can be rolled to an extremely thin thickness under a stable reduction ratio setting. Here, rolling to ultrathin is used in a concept including making the plate in such a situation extremely thin.
Rolling energy is supplied by the difference between the outlet side and the inlet side at point A of the autonomous plate tension. Then, as described above, a constant rolling reduction operation is performed within the allowable range of rolling load.

In the above example, the rolling reduction rate is 30%. However, even when the rolling reduction rate is other than the above value, the above-described characteristics can be established and normal rolling can be performed.
In addition, this specific numerical example shows that the tension at the inlet side and outlet side of point A autonomously matches the rolling load even if the rolling reduction is changed from 0 to 40% with the same rolling load at the final stand of the tandem mill. State.

Both work rolls 2 and 3 are driven at different peripheral speeds, and the rolling material 1 passes between the work rolls 2 and 3 (A) between the low-speed work roll 3 and the reinforcing roll 5 (B ₁ ), and then on the high speed side. It is configured to pass between the work roll 2 and the reinforcing roll 4 (B ₂ ), and the work rolls 2 and 3 are driven at different peripheral speeds with the rolling load applied to the points B ₁ , A and B _2. The plate tension on the inlet side and the outlet side at the acting point A can be made autonomous by balancing the applied rolling load, and the rolling energy can be supplied by the difference between the outlet side and the inlet side at the point A of the autonomous plate tension. By adopting the means, the rolling material can be rolled into an extremely thin plate material without adding another device, for example, another plate tension device.

  As described above, the rolling mill 100 of this example is composed of a four-high rolling mill composed of work rolls 2 and 3 and reinforcing rolls 4 and 5, and after the rolling material 1 passes between the lower reinforcing roll 5 and the lower work roll 3. It is passed through the bridle roll 16, passed between the work rolls 2 and 3, passed through the bridle roll 15, and further passed between the upper work roll 2 and the upper reinforcing roll 4.

As described above, a rolling mill having at least a four-stage roll configuration of a set of work rolls and a set of reinforcing rolls for reinforcing the work rolls, and further using this rolling mill, the peripheral speeds of both work rolls are changed. In the rolling mill and rolling method, the two work rolls are driven at different peripheral speeds by different peripheral speed driving devices to operate as a high-speed work roll and a low-speed work roll, respectively. A) Before passing, hang so that it passes between the low speed side work roll and the reinforcing roll (B ₁ ) that reinforces it, and between both work rolls (A), after passing between the high speed side work roll and the other reinforcing roll ( B ₂ ). The rolling load is applied to points A, B ₁ and B ₂ by a reduction device, and the rolling material speed on the inlet side is set to the peripheral speed of the low-speed work roll by the frictional force at points B ₁ and B ₂ , and the rolling material on the outlet side. The rolling reduction ratio of the rolled material is defined by the peripheral speed ratio of the upper and lower work rolls by synchronizing the speed with the peripheral speed of the high-speed work roll. In addition, the effect of friction on the rolling is eliminated by removing the neutral point from the contact arc with the rolling material at point A, and the ultra-thin material is rolled with a large-diameter work roll consisting of the work roll and the reinforcing roll. It is comprised so that it may carry out with the rolling mill which has a 4-stage roll structure.

  In this case, the energy required for rolling is given by the difference between the exit side tension and the entry side tension at point A, and this tension difference is autonomously constant from the rolling load, and the rolling load is the tension value on the entering and exiting side. When the rolling load is changed, the tension on the entry / exit side automatically corresponds to this, and the rolling load is arbitrarily selected within the allowable value of the tension on the entry / exit side.

  Further, a rolling load allowable range in which the lower limit value of the rolling load depends on the outlet side plate tension and the upper limit value depends on the inlet side plate tension is set, and the rolling load is within the rolling load allowable range. Autonomous with differences in plate tension.

  As shown in FIG. 4, the rolling material speed on the inlet side is low due to the action of the rolling load between the reinforcing rolls 4 and 5 and the work rolls 2 and 3 in contact with the rolling material and in the presence of frictional force. The rolling material speed on the work roll 2 and the rolling material speed on the outlet side are synchronized with the peripheral speed of the high speed work roll 2, and in order to match the peripheral speed ratio, the speed ratio of the rolling material is set. There is no need to make contact with the rolling material at any place other than the main body of the rolling mill and attach another device, and the structure becomes simple. In this case, the magnitude of the rolling load P has no substantial influence on the synchronizing action under normal operation, and therefore it can be said that the magnitude of the rolling load P is autonomous from the synchronizing action. The peripheral speed ratio of the work rolls 2 and 3 is automatically determined by the gear ratio of the different speed gears 8 and 9 as a different speed drive device. In the case shown in FIG. 7, it is determined by the gear ratio to be combined.

The bridle rolls 15 and 16 have three roles.
1) The work rolls 2 and 3 are fully cooled to withstand high speed rolling.
2) When the work roll 2 is wound around the work roll 2 at the place where the rolling point A between the work rolls 2 and 3 exits, bending occurs in the state of plastic deformation, and the plate is bent, so that it should be drawn out in a straight line.
In addition, the angle at which the rolled material is drawn out is not horizontal, but the material is subjected to bending stress to prevent bending or warping of the plate that is expected to occur due to different peripheral speed rolling.
3) Install a tension meter to monitor the plate tension within the allowable range.
If the tension exceeds the allowable range, correct the rolling load (rolling force) P.
It is. In this case, the rolling load P is applied to B ₁ , A, and B ₂ . B ₁ is between the reinforcement roll 5 and the work roll 3, and B ₂ is between the work roll 2 and the reinforcement roll 4. The work rolls 2 and 3 are rotated at a speed ratio corresponding to the rolling reduction as described above. It is desirable to determine the speed ratio mechanically. As a result, the point A gives the rolling load necessary for rolling, and the points B ₁ and B ₂ give the necessary tension by the frictional force due to P.

Only two points of the work rolls 2 and 3 are driven, and there are two purposes of driving. One is for the friction force between the material and the roll, and the other is a tension that gives energy of plastic deformation to the material. The former is performed at point A and the latter is performed at point B (B ₁ , B ₂ ). In this case, the work of the point B can be performed only by the reinforcing roll driving, but the work roll driving is performed because the work of the point A cannot be performed. The driving of the work roll is indispensable, and the driving of only the work roll is sufficient in the thin rolling which is the main focus of the present embodiment. Further, such work can be facilitated by driving a single work roll such as when a rolled material is passed or unwound.

Next, a different speed driving system for the roll will be described. There are various ways to achieve different speeds of rolls.
1) Twin drive method This is a method in which two motors are provided, the motor on the high speed side and the generator on the low speed side. This is not economical because the motor has a large capacity and the speed control requires precision.
2) Method using differential gears This method is characterized in that the energy of the power generation is mechanically restored, the capacity of the motor is small, and the speed ratio can be varied. There is a necessary drawback.
3) Method of mechanically determining the speed ratio This is a method of changing the upper and lower diameters of the pinion stand, which had the same diameter in the upper and lower parts, according to the reduction ratio. This has the disadvantage that the rolling reduction is fixed, but it is simple and the speed ratio is kept accurate. This method is desirable.
The most common is the twin drive system in which the upper and lower rolls are driven by separate motors. This method has two drawbacks.

One is that the total capacity of the motor is increased. In this method, if the output of the electric motor is approximately 100, the capacity of the generator is about 50. If this is mechanically connected to form one motor, 100-50 = 50, which is one third.
The other requires a control device to increase the accuracy of the different speeds. The mechanical system guarantees an accurate speed ratio without control. Therefore, it is not necessary to measure the thickness of the outlet side if the thickness of the material is known. Further, when the plate thickness is 10 μm or less, the accuracy of the thickness gauge also decreases. The mechanical method has the strength that can be maintained even if the percentage of the thickness accuracy of the material becomes thin. In the case of reversible rolling, the gear system requires three gear ratios of forward, reverse, and low pressure reduction, which complicates the structure and increases the equipment cost. In some cases, twin drive with two motors is desirable. This plan naturally has the advantage that the product thickness can be freely changed.

  There is also a method of performing twin drive using a differential gear. However, in the work roll drive, there is a problem of space, and in addition to dealing with reversible rolling, there are merits of variable speed, but this requires a separate electric motor and also causes a problem of control accuracy.

  The simplest method is shown in FIG. That is, in the two-roll drive pinion stand, the upper and lower gears are changed in diameter and rotated at different speeds.

  FIG. 7 shows a different speed rotation driving device 30 (different circumferential speed driving device) using one different speed rotating gear. In FIG. 7, two shafts 32 and 33 that are connected to work rolls 2 and 3 and transmit rotational power are disposed in a housing 31. A motor 34 serving as a drive source is connected to the shaft 32 via a connecting device 35. Further, two shaft fixing gears 36 and 37 having different numbers of teeth are fixed to the shaft 32 in the housing 31. In the figure, the shaft fixed gear 37 has a larger diameter and a larger number of teeth than the shaft fixed gear 36.

  The shaft 33 is provided with two free gears 38 and 39 having different numbers of teeth in the housing 31 so as to be rotatable via rolling bearings 41 and 42. The free gear 38 is a fixed shaft gear 36, and the free gear 39 is The shaft is engaged with the shaft fixing gear 37. A small-diameter clutch gear 43 is formed integrally with the free gear 38 and is free to rotate with respect to the shaft 33 by the rolling bearing 41. The free gear 39 is formed with a small-diameter clutch gear 44 having the same diameter as the clutch gear 9, and is free to rotate with respect to the shaft 33 by the rolling bearing 42.

  A clutch gear 45 having the same diameter between the clutch gear 43 and the clutch gear 44 is fixed to the shaft 33 by a fixed key 46. Around the clutch gears 43, 45, 44, a switching clutch 47 is provided so that the rotor 48 is rotated by the operation of the clutch switching lever 48, and accordingly it moves in the horizontal direction.

  Therefore, by operating the clutch switching lever 48, the switching clutch 47 connects the clutch gear 43 and the clutch gear 45, the clutch gear 44 and the clutch gear 45, or meshes only with the clutch gear 45, and either of the clutch gears 43 and 44 is engaged. Is also considered free. Thus, the position is set at three points.

  Rolling bearings are provided between the housing 31 and the shafts 32 and 33. In the drawing, rolling bearings 51 and 52 provided between the shaft 33 and the housing 31 are displayed. Reference numerals 53, 54, 55 and 56 denote bearing retainers. Such a different speed rotation drive gear device 30 provides different speeds and controlled speeds that can be switched to the work rolls 2 and 3. The different speed switching is mainly used for reversible rolling, and in the case of free, it is used for passing plates.

  8 and 9 show alternatives to the different speed rotation drive gear device 30 shown in FIG. In this proposal, the load is distributed between the right and left reduction devices while adopting a conical shape as the roller, maintaining a constant conical ratio with the other roller in contact with the roller, and maintaining a constant peripheral speed ratio of the upper and lower body lengths. Thus, only a specific roller group is brought into contact, and the other roller groups are separated and kept in a non-contact state. Hereinafter, a detailed description will be given based on FIGS. 8 and 9.

FIG. 8 shows an example in which the different peripheral speed ratio is switched in two steps. The differential speed rotation drive device 130 of this example includes right and left housings 131 and 132 disposed on a bed 140, and hydraulic cylinders 135 and 136 and a hydraulic piston 137 disposed in the housings 131 and 132. , 138, separators 141 and 142 provided vertically between the housings 131 and 132, and an upper conical roller group 143 and a lower conical roller group provided as a set opposite to each other between the housings 131 and 132. 144, bearing devices 151, 152 provided on the shaft 145 provided with the upper conical roller group 143 in contact with the hydraulic pistons 137, 138, respectively, and a bearing device provided on the shaft 146 provided on the lower conical roller group 144. 157, 158. The bearing devices 151 and 152 include bearing housings 153 and 154 and rolling bearings 155 and 156, respectively. The bearing devices 157 and 158 include bearing housings 159 and 160 and rolling bearings 161 and 162, respectively. The upper conical roller group 144 has two sets of rollers 171 and 172 on the shaft 145, and the lower conical roller group 144 has two sets of rollers 173 and 174 spaced apart on the shaft 146. The roller 171 and the roller 172 are arranged to face the roller 173 and 174, respectively. In the drawing, the roller 171 has a right end diameter smaller than the left end diameter, and the roller 173 similarly has a right end diameter smaller than the left end diameter. That is, the diameter of the left end of the roller 171 is D ₂ and the diameter of the right end is αD ₂ (α <1). The diameter of the left end of the roller 173 is D ₁ and the diameter of the right end is αD ₁ (α <1).

In the case of the rollers 172 and 174, the right diameter of the roller 172 is D ₂ ', the right diameter of the roller 174 is D ₁ ', and the left diameters are αD ₂ 'and αD ₁ ', respectively. In such an arrangement, rollers 171 and 172 are brought into full contact with the roll surfaces as shown in the drawing by the pressures P ₁ and P ₂ acting on the hydraulic pistons 137 and 138. In this case, the roller 172 and the roller 174 are separated and do not contact each other. Then, due to the load distribution of the hydraulic devices 151 and 152, the roller 172 and the roller 174 contact each other, and the roller 171 and the roller 173 are brought into a non-contact state.

In this way, the conical ratio of the contacting roller is constant, and the upper and lower peripheral speeds of the contacting barrel length can be kept constant. Only a specific roller group (rollers 171, 173 or rollers 172, 174) is brought into contact with the change in load distribution of the left and right hydraulic devices 151, 152, and the other roller groups are separated and kept in a non-contact state. In this manner, a specific combination of rollers can be selected and the different peripheral speed ratio can be easily switched.
In the above example, a hydraulic device is adopted as the reduction device, but the same effect can be obtained as an electric device. In the case of a hydraulic device, switching is performed by changing the left and right hydraulic pressure, and in the case of an electric device, switching is performed by changing the reduction device.

  In FIG. 8, the left sides of the shafts 145 and 146 are connected to a spindle (not shown) to drive the work roll via the spindle, and the right side of the shaft 146 is connected to and driven by a drive motor (not shown). FIG. 9 shows an example in which the roller groups 143 and 144 of the different speed rotation drive device 131 of FIG. 8 are changed to roller groups 181 and 182. The rollers 171 and 173 and the rollers 172 and 174 provided on the left and right have the same configuration, and cylindrical rollers 183 and 184 as central rollers are provided between these rollers. According to this example, three stages of switching are possible. By installing the cylindrical rollers 183 and 184 as the central rollers, it is possible to drive at three different speeds by switching the hydraulic pressure or the reduction position, that is, by selecting a conical roller or a cylindrical roller.

  According to these examples, it is possible to easily switch the different speed ratio, and there is a concern when using a gear mechanism in the different speed rotation drive device due to a gear pitch error or the like in the rolling mill during extremely thin rolling. There is no possibility of a minute mark due to a rotation error. As described above, the differential speed control of the friction drive by the combination of rollers has a great advantage and is optimal.

The above is summarized as shown in FIG. The rolling mill to be used is preferably a rolling mill having a four-roll configuration, but does not exclude a rolling mill having a six-roll configuration or an eight-roll configuration, or a rolling mill having a higher multi-roll configuration. Both work rolls used have diameters D _wt and D _wb = 2R _w , respectively. Both work rolls rotate at n _t and n _b , respectively.
〇 Corresponding conditions for three conditions for realizing completely different speed rolling (1) Autonomous determination of plate speed High-speed work roll V _d = V _Rt
Low speed work roll V _e = V _Rb
Both work rolls are driven at different peripheral speeds by different peripheral speed drive devices to operate as a high-speed work roll and a low-speed work roll, respectively, and before the rolling material passes between both work rolls (A), It is hung so as to pass between the reinforcing rolls (B ₁ ) that reinforce this, and after passing between both work rolls (A), it is hung so as to pass between the high speed side work roll and the other reinforcing roll (B ₂ ). Thus, the rolling material speed on the inlet side is set to the peripheral speed of the low-speed work roll and the rolling material speed on the outlet side is set to the high-speed side work by the frictional force caused by the rolling load P in B ₁ and B ₂ . Synchronize (match) with the peripheral speed of the roll.

すなわち、両作業ロールの周速比のみに依存してγが決定される。
条件（２） ロールと圧延材料間の摩擦トルク供与
高速側作業ロールに μＰＲ_w
低速側作業ロールに −μＰＲ_w
の摩擦トルクを供与する。このため、作業ロール駆動が必須条件とされる。
条件（３）
圧延エネルギの供与は、出入口の板張力差によって行う。σ_tdはＢ₂において、σ_teはＢ₁おいて圧延荷重Pによる摩擦力で両作業ロールによって圧延材料に伝達する。出口側と入口側における板張力の差は次のようになる。

Determination of the rolling reduction γ The rolling reduction γ is determined by the following.

That is, γ is determined depending only on the peripheral speed ratio of both work rolls.
Condition (2) Friction torque provision between roll and rolling material μPR _{w for} high speed side work roll
-ΜPR _{w for} low-speed work roll
Of friction torque. For this reason, work roll driving is an essential condition.
Condition (3)
Rolling energy is supplied by a difference in plate tension at the entrance and exit. σ _td is transmitted to the rolling material by both work rolls at B ₂ and σ _te is B _{1 at the} frictional force due to the rolling load P. The difference in plate tension between the outlet side and the inlet side is as follows.

圧延荷重Ｐは、次の式で表される。
ここで、Ｂ，Ｓ，ｈ_e，γは一定で、

従って、
Ｐ＝ｆ₁（σ_td）又はＰ＝ｆ₂（σ_te）
γ一定のままＰを変えると、Ｐはσ_te又はσ_tdに依存し、σ_td−σ_teは右図に示すように自律的に対応する。従って、Ｐは特定の値に限定されることを要しない。従って、Ｐを変えてσ_tdを変数にすることが容易に可能になる。 O Characteristics of rolling characteristics As described above, the difference in plate tension between the outlet side and the inlet side is as follows.

The rolling load P is expressed by the following formula.
_{Here, B, S, h e,} γ is constant,

Therefore,
P = f ₁ (σ _td ) or P = f ₂ (σ _te )
When P is changed while γ is constant, P depends on σ _te or σ _td , and σ _td −σ _te autonomously corresponds as shown in the right figure. Therefore, P need not be limited to a specific value. Therefore, it becomes easy to change σ _td as a variable by changing P.

完全異速圧延によりμ＝０とするように作用せしめることが可能であるので、ｈ_minを限りなく０に近づけ、極薄の板材に圧延することができる。この場合に、本実施例の特徴は、４段式ロール構成の圧延機、すなわち通常の大径の作業ロールを使用して極薄の板材に圧延することが可能であるということである。そして、このことは繰業を大幅に容易にすることを意味する。
尚、ｈ_min，Ｋ，Ｄ，μ，Ｓ，σ_tmの定義は図内に示す。 * Effect _hmin is represented by the following formula.

Since it is possible to cause μ = 0 by completely different speed rolling, h _min can be brought as close to 0 as possible and rolled into an extremely thin plate material. In this case, the feature of the present embodiment is that it can be rolled into an extremely thin plate using a rolling machine having a four-stage roll configuration, that is, a normal large-diameter work roll. And this means that the work is greatly facilitated.
The definitions of h _min , K, D, μ, S, and σ _tm are shown in the figure.

As described above, this embodiment uses a rolling mill having at least a four-stage roll configuration of a set of work rolls 2, 3 and a set of reinforcing rolls 4, 5 that reinforce the work rolls 2, 3. A rolling method and a rolling mill for rolling by changing the peripheral speeds of both work rolls 2 and 3, wherein both work rolls 2 and 3 are driven at different peripheral speeds by different peripheral speed drive devices 30 and 130, respectively. Operate as roll 2 and low-speed work roll 3, and roll the rolling material so that it passes between low-speed work roll 3 and reinforcing roll 5 (B ₁ ) that reinforces it before passing between both work rolls (A). After passing between the two work rolls (A), the work roll 2 is hung so as to pass between the high-speed work roll 2 and the other reinforcing roll 4 (B ₂ ), and the rolling load P is applied to A, B ₁ and B ₂ by the reduction device 19. The speed of the rolling material on the inlet side of the work roll 3 on the low speed side The speed, the rolling material speed of the outlet side is tuned to the peripheral speed of the high-speed side work roll 2, further friction in B ₁ and B _2, so as to eliminate the effect of friction against rolling in A rolling material outlet The plate tension on the inlet side and the inlet side depends on the rolling load P, and the difference in plate tension between the outlet side and the inlet side σ _td -σ _te is made autonomous from the rolling load. Rolling material is rolled into an ultra-thin plate by a four-stage roll configuration in which rolling energy is supplied with a difference σ _td −σ _te and the above-described work rolls 2 and 3 and reinforcing rolls 4 and 5 are combined. A rolling method and a rolling mill are configured.

In addition, this embodiment uses a rolling mill having at least a four-stage roll configuration of a set of work rolls 2 and 3 and a set of reinforcing rolls 4 and 5 that reinforce the work rolls 2 and 3. A rolling method and a rolling mill that perform rolling while changing the peripheral speeds of 2 and 3, and the work rolls 2 and 3 are driven at different peripheral speeds by different peripheral speed driving devices 30 and 130, respectively. Operate as a low-speed work roll 3, and roll the rolled material so that it passes between the low-speed work roll 3 and the reinforcing roll 5 (B ₁ ) that reinforces it before passing between the work rolls (A). After passing between the rolls (A), it is hung so as to pass between the high-speed work roll 2 and the other reinforcing roll 4 (B ₂ ), and the rolling load P is applied to the points A, B ₁ and B ₂ by the reduction device 19, The rolling material speed on the inlet side is set to the peripheral speed of the low speed work roll 3, The rolling material speed of the mouth-side is tuned to the peripheral speed of the high-speed side work roll 2, and B ₁ and the frictional force in B _2, the outlet side and the inlet side of the rolling material so as to eliminate the influence on rolling at point A The sheet tension of the sheet is made to depend on the rolling load, the difference in sheet tension σ _td −σ _te between the outlet side and the inlet side is made autonomous from the rolling load P, and the reduction ratio γ is determined depending on the peripheral speed ratio of both work rolls. Thus, a rolling method and a rolling mill for rolling a rolling material into an extremely thin plate material are configured by a four-stage rolling roll configuration in which the above-described work rolls 2 and 3 and reinforcing rolls 4 and 5 are combined.

In addition, this embodiment uses a rolling mill having at least a four-stage roll configuration of a set of work rolls 2 and 3 and a set of reinforcing rolls 4 and 5 that reinforce the work rolls 2 and 3. Rolling method and rolling machine for rolling at different peripheral speeds, wherein work rolls 2 and 3 are driven at different peripheral speeds by different peripheral speed drive devices 30 or 130, respectively, and high speed side work roll 2 and low speed side work respectively. Operate as a roll 3, before passing the rolling material between the two work rolls (A), wrap around the low-speed work roll 3 and the reinforcing roll 5 (B ₁ ) that reinforces the roll material between the two work rolls ( After passing through A), it is hung so as to pass between the high-speed work roll 2 and the other reinforcing roll 4 (B ₂ ), and the rolling load P is applied to points A, B ₁ , B ₂ by the reduction device 19, The rolling material speed is set to the peripheral speed of the low-speed work roll 3, and the outlet side The rolling material speed is tuned to the peripheral speed of the high-speed side work roll 2, and B ₁ and the frictional force in B _2, the outlet side and the inlet side of the plate tension of the rolling material so as to eliminate the influence on rolling at point A Σ _td + σ _te is made to depend on the rolling load P, the plate tension difference σ _td −σ _te on the outlet side and the inlet side is made autonomous from the rolling load P, and the reduction ratio γ is only the peripheral speed ratio of both work rolls. The rolling load P is set depending on the magnitudes of the plate tensions σ _td and σ _te on the outlet side or on the inlet side while keeping the rolling reduction γ constant. A rolling method and a rolling mill are provided.

Further, separately or in combination with the above-described configuration, the work rolls are driven at different peripheral speeds by different peripheral speed drive devices to operate as high speed side work rolls and low speed side work rolls, respectively, and the rolling material is moved between both work rolls. (A) Before passing, hang around (B ₁ ) between the low speed side work roll and the reinforcing roll that reinforces this, and after passing between both work rolls (A), between the high speed side work roll and the other reinforcing roll (B ₂ ), and the rolling load is applied to points A, B ₁ , B ₂ by a reduction device, the rolling material speed on the inlet side is set to the peripheral speed of the low speed work roll, and the rolling material speed on the outlet side is set to The plate tension on the outlet side and the inlet side of the rolled material is adjusted to the rolling load so that the frictional force at B ₁ and B ₂ is synchronized with the peripheral speed of the high speed side work roll and the influence on the rolling at point A is eliminated. Dependent and out The difference between the plate tension on the side and the inlet side is made autonomous from the rolling load, and the rolling reduction is made to be determined depending on the peripheral speed ratio between the two work rolls. A rolling method and a rolling mill for rolling a rolled material into an ultrathin plate material by a corrugated roll configuration are configured.

With the rolling mill and rolling method described above, it was possible to reduce the h _min as much as possible, and this was proved by experiments. When an ultra-thin plate is rolled, there is a concern that vibration is generated by direct contact between the end side portions of the large-diameter work rolls, which may cause a mark or a plate breakage. FIG. 11 shows the phenomenon in that case in an easily understandable manner.

As shown in FIG. 11A, a rolled plate (rolling material) 1 is placed between the upper work roll 2 and the lower work roll 3 and rolled. The width of the rolled plate 1 is B and the thickness is hd. As shown in FIG. 11 (a), in the case of (A) the plate thickness is large, the end side portions of the upper work roll 2 and the lower work roll 3 are close to each other, but may not come into contact with each other. as shown in b), (B) the thickness small in the case occurs that both the work rolls are in contact over a length of l _k at the end side of the upper work roll 2 and a lower work roll 3 comrades There is a concern to do. This concern can be resolved as follows.

(Solution 1)
Solution 1 is shown in FIG. In this method, the roll surface of at least one of the upper and lower work rolls 2 and 3 has a roll surface length portion (roll side) on both sides wider than the rolled material plate width (located at the center surface long portion). The roll surface length part) has a smaller diameter than the center surface length and prevents the occurrence of vibration due to direct contact between the work rolls used for different peripheral speed rolling. In the case of the side shown in FIG. 12, a work roll having a normal shape is used as the lower work roll B, and the upper work roll is a work roll having both sides of the roll surface length reduced in diameter at an angle θ. I use it. By such a combination of work rolls, contact between the end portions of the work rolls shown in FIG. 11B can be easily avoided. You may employ | adopt the work roll of the structure similar to the upper work roll 2 for the lower work roll 3. FIG.

(Solution 2)
FIG. 13 shows Solution 2. In this case, the upper and lower work rolls 2 and 3 are each configured to shift to the opposite side (side) in the roll axis direction, and preferably the plate end portion is configured to coincide with the roll end portion on the left and right sides. According to the configuration, the occurrence of vibration due to direct contact between the work rolls used for different peripheral speed rolling is prevented. In FIG. 13, the upper work roll 2 is reinforced by the upper reinforcement roll 4, and the lower work roll 3 is a type of rolling mill reinforced by the lower reinforcement roll 5, and the rolled sheet 1 is A part, B ₁ part, B _In this case, the roll end portion (including the end) 111 of the upper work roll 2 is made to coincide with the plate end portion 112 of the rolled plate 1 in the vertical direction. The upper and lower work rolls 2 and 3 are shifted in the roll axial direction so that the roll end 113 of the lower work roll 3 coincides with the plate end 113 of the rolled plate 1. In the figure, since the plate ends of the A portion and the B ₁ and B ₂ portions coincide with each other, only 112 and 113 are indicated as the plate end portions, and it is well known for the axial shift of the upper and lower work rolls 2 and 3. A work roll shift device is used.

(Solution 3)
FIG. 14 shows Solution 3. In this case, in addition to Solution 2, the reinforcing roll is also shifted in the direction opposite to the shift direction of the work roll that comes into contact, and when only the work roll is shifted, the pressure distribution is uneven in B ₁ and B ₂ parts. It prevents the risk of meandering of the plate. In FIG. 14, the upper reinforcing roll 4 is held by a reinforcing roll choke 122 on which the reduction screw 121 acts, and is shifted in a direction opposite to the shifting direction of the upper work roll 2 by a reinforcing roll shift device (not shown). Although not shown, the same shift configuration is also used for the lower reinforcing roll 5. Accordingly, the roll end portions of the upper work roll 2 and the lower reinforcement roll 5 are in a relationship that coincides in the vertical direction, and the roll end portions of the lower work roll 3 and the upper reinforcement roll 4 are in a relationship that coincide in the vertical direction.

FIG. 15 is a diagram illustrating a pressure distribution state in the example of FIG. As shown in FIG. 14, the pressure distribution load generated in each of the A ₁ part, B ₁ part, and B ₂ part is uniform in the width direction by adopting the shift configuration of the work rolls 2 and 3 and the reinforcing rolls 4 and 5. Thus, the risk of occurrence of meandering of the plate can be prevented.

  Next, the application of this method to a continuous tandem rolling mill will be described. Conventionally, in the cold rolling of tin materials, a tandem rolling mill having 5 to 6 stands is usually employed. In this method, about two conventional rolling mills are required, but thereafter, three to four rolling mills are accommodated in one roll housing, the reduction device is one set, and the drive motor is also 1-2. It is an extremely compact system that only requires a table, and can produce thin plates more easily at low construction costs.

  A typical example is shown in FIG. In FIG. 16, the illustration of the detailed structure of the equipment on the inlet side is omitted. However, in order to continue rolling, the equipment for welding and joining hot coils of materials and about two normal rolling mills (this is a roll that can be strongly reduced) A shift type 6-high rolling mill is desirable). After that, the tandem rolling mill of the present invention is located, and a known running cutting machine and winding machine are arranged on the exit side. FIG. 16 shows an example in which three rolling mills are provided in one housing 58.

The roll can be driven by a single electric motor if the rolling reduction ratios of all the stands are constant, but the rolling reduction ratio can be changed only in the final rolling mill, considering the case where changes in product sheet thickness cannot be handled by the upper normal rolling mill. Therefore, another electric motor is provided. However, it is not limited to this.
Among these, the rolling conditions of the rolling mills are different. In particular, in the final rolling mill, the rolling of each pass can be rolled with the same rolling load in order to change the rolling reduction, and it has been impossible to predict in the past.

  First, it is necessary to clarify this point, but since the former stage is thick, there is no problem even with a normal rolling mill.

  In the place where the thickness of the previous stage is thick, it is possible to use a normal rolling mill regardless of the PV system. Therefore, as an example, the sheet thickness on the inlet side is set to 1.8 mm, and this is rolled to 0.46 mm with a normal rolling mill. Table 1 shows an example of rolling in 3 stands up to 0.1 mm with a tandem mill.

Now, the thickness of the hot strip is 1.8mm, the thickness of the outlet from the normal rolling mill, that is, the thickness of 0.46mm that passes between the rolls 68 and 62 at the entrance of the new tandem mill, and the schedule of each pass is all passes. Table 1 shows the rolling load P (kg / mm) when the rolling reduction is 40%. The work roll diameter is 500 mm. However, in each pass, the inlet side tension is assumed to be 20 kg / mm ² . In addition, Formula 4 is used for the formula of rolling load.

すなわち、各パスによって圧延荷重Ｐは異なる。然るに圧延荷重を一定にすれば入口側張力σ_teが自動的に変化して圧延荷重に適合する。ただし、σ_td−σ_teは圧下率が一定であれば一定でσ_teが変化すれば必然的にσ_tdも変化して圧延荷重に適合する。

That is, the rolling load P is different for each pass. However, if the rolling load is kept constant, the inlet side tension σ _te automatically changes to match the rolling load. However, σ _td −σ _te is constant if the rolling reduction is constant, and σ _td is inevitably changed if σ _te is changed, and is adapted to the rolling load.

FIG. 17 shows how σ _te changes so that the load P = 272 kg / mm in the third pass coincides with 356 kg / mm in one pass. That is, rolling the suppressed to P = 356kg / mm load inevitably sigma _te the rolling reduction holds a constant 40% by rolling of the third path 20 kg / mm ² from 9.3 kg / mm ² in, sigma _td conforms to the rolling load 356kg / mm lower from 67 kg / mm ² to 56.3 kg / mm ^2. For the second pass, the inlet side tension σ _te2 is defined as 14.0 kg / mm ² so that the rolling load P is 356 kg / mm. This is because the plate tension corresponding to the rolling load is generated with the characteristics described in the above-mentioned single stand rolling mill, and a certain rolling reduction is ensured. However, if the rolling load deviates more than a predetermined value, the tension becomes zero or excessive. It is safer to be able to measure the tension of the plate with a bridle roll in order to monitor it and set it to an appropriate rolling load.

すなわち、σ_teは常にプラスでストリップがたるむことはない。尚、圧下率γ＝０％であればσ_teは９．５にこだわる必要はないが、極めて小さい圧下率を想定しての値である。これにより、第３パス目は同じ圧延荷重で圧下率を０から４０％まで変化させられることが判る。図１８に表２の張力関係を示す。 Next, the problem of whether or not the rolling reduction in the third pass can be changed under the condition of a constant rolling load will be clarified.
The rolling load is as shown in Table 2 with reference to Table 1 defined as 356 kg / mm.

That is, σ _te is always positive and the strip does not sag. If the rolling reduction γ = 0%, σ _te need not be 9.5, but is a value assuming a very small rolling reduction. Thereby, it turns out that the rolling reduction can be changed from 0 to 40% with the same rolling load in the third pass. FIG. 18 shows the tension relationship in Table 2.

Next, FIG. 16 will be described in detail.
The rolling material 41, which is a strip that has exited the preceding normal rolling mill, for example, the six-high rolling mill 101, is rolled around the work rolls 62 to 67 and the reinforcing rolls 68 to 71. These six work rolls and four reinforcing rolls are accommodated in one housing 58, and a rolling load is applied by a common reduction device 59. In addition, 61A shows the rolling material on the inlet side, and 61B shows the outlet side rolling material (ultra thin plate).

Reference numerals 73 to 77 denote bridle rolls whose purpose is to sufficiently cool the roll and strip and to measure the plate tension with a tensiometer. In the final pass, the strip is bent in the rolled state to prevent the bending of the plate.
However, it is omitted between the first reinforcing roll 68 and the work roll 62 that the tensiometer is provided as 17 on the outlet side of 80. In this case, since the rolling speed is slow, the roll is sufficiently cooled on one side. That is. In the drive system, the work rolls 62, 63, 64, 65, 66 are driven at a constant speed ratio by the electric motor 81. The electric motor 89 drives only the work roll 67 at a variable speed.

A series of connected gears 82, 83a, 83b, 87, 84, 85, 88, 86 has a gear ratio corresponding to the reduction ratio of each path. In this case, it is important that the peripheral speeds of the contact points A and B, C and D coincide. Therefore, D ₃ and D ₄ , D ₅ and D _{6 make} the roll diameters exactly the same. The pitch diameters of the gears 84 and 83b, 85 and 86 must be matched. The clutches 90, 91, and 92 are used to drive the rolls at a constant circumferential speed for each pass so that the plates can pass at a constant speed when passing through the plates. The roll coolant is preferably low-lubricating oil in the preceding stage, but it may be desirable to use high-lubricating coolant in the subsequent stage in order to reduce the temperature rise of the rolls and strips.

As described above, in a rolling method in which rolling is performed by changing the peripheral speed of both work rolls using a rolling mill provided with a set of work rolls and a reinforcing roll that reinforces the work rolls, the reinforcing roll (S ₁ ), Work roll (W1), Work roll (W2), Reinforcement roll (S2), Work roll (W3), Work roll (W4), Reinforcement roll (S3), ..., Work roll (Wn), Reinforcement roll (Sn) A plurality of tandem rolling mills arranged in the manner described above are housed in one housing, and the rolling material is sequentially passed between all the rolls, and all the rolling machines are provided by one rolling device provided in the housing. A rolling load is applied through the rolling material between the rolls, both work rolls are driven at different peripheral speeds, and different peripheral speed rolling is performed on the rolling material by the frictional force between the work rolls and the reinforcing rolls, and the plate tension on the outlet side and the inlet side. Difference in plate tension is rolling load A rolling method and a rolling mill are provided, in which neutral points between work rolls are eliminated by supplying plate tension in an autonomous state to supply energy necessary for rolling.

In addition, since the rolling load is not applied to the bearing of the intermediate reinforcing roll excluding B ₁ and Bn of the reinforcing roll, this portion may be reduced in strength. However, if the diameter of the reinforcing roll is made too small, rolling occurs between the work roll and the reinforcing roll, and the plate tension supplied between the work rolls decreases due to the energy. The roll diameter must be determined.

  FIG. 19 shows an example in which the rolling mill 100 (FIG. 19) of the present embodiment (first embodiment) type is added or modified on the exit side of an existing tandem rolling mill. This example shows that the rolling mill described above is employed only in the tandem final stage rolling mill to perform rolling of the rolling mill. Thereby, it becomes possible to produce a thinner plate thickness stably. For each configuration shown in the figure, reference should be made to the previous embodiment.

The implementation effects of the present invention will be described comprehensively.
The biggest advantage is that ultra-thin rolling is possible with a large diameter work roll,

1) Applying the tension of different peripheral speed rolling, which requires high-tension rolling, with a roll at the same speed without using a winder, high-tension rolling can be performed without fear of sheet breakage. The tension can be low enough to remove, and the shape of the plate can be omitted, and the shape can be observed with the naked eye or with a simple method.

2) If the reduction ratio is kept constant, the thickness of the base plate can be determined by the reduction ratio if the thickness of the base material is known. However, in this method, the% of the thickness accuracy of the base material can be maintained as it is.

3) As a means to stabilize the plate shape and improve accuracy, an intermediate roll that can be shifted according to the plate width is used to remove the harmful contact part between the work roll and the reinforcing roll that are wider than the plate width, which is a four-stage defect. Although a six-stage rolling mill (known as HC-Mill) provided between a reinforcing roll and a work roll has been highly evaluated and widely used worldwide since 1975, in this embodiment, The B ₁ point and B ₂ point plates have the effect of serving as an intermediate roll.

4) In general rolling mills, the deformation resistance of the material was 1.15 times the yield point, which was consistent with the fact, but in HC-Mill, if 1.15 times were not set to 1.0, it would not match the operating data. There is. This HC effect is naturally expected in the present invention, and the effect is great. That is, the slip speed of the roll and the rolled material is greatly different in different peripheral speed rolling compared to normal rolling.
This greatly affects the temperature rise of rolls, especially ultrathin strips. The slip speed of different speed rolling is 1.6 times at 30% reduction and 1.5 times at 40% compared to normal rolling, and the heat generation is proportional to the product of this slip speed and rolling load. This rolling load is also greatly reduced by the effect of different peripheral speeds, but if the above-mentioned HC effect is added to this, it can be greatly improved, and the strip temperature rise, which is the biggest problem in ultra-thin rolling, is greatly relaxed and becomes below normal rolling. .

5) The rolled material can be rolled to an extremely thin thickness without annealing. For example, it is possible to roll a stainless material of about 200 μ as a raw material to an ultrathin thickness of 20-10 μ without annealing. Naturally, it can be easily rolled to a plate thickness greater than this.
Further, the presence of the plate at points B ₁ and B ₂ eliminates the largest cause of the axial deflection of the work roll of the four-high rolling mill due to the rolling load, and a plate having a good shape can be obtained.

6) Application to a tandem rolling mill is possible. 3 units with 1 housing and 1 rolling device
Rolling for 4 stands is possible. Also, the number of rolls can be reduced. Although the number of work rolls does not change, only four reinforcing rolls are required for three stands. In the case of 3 stands, at least 3 electric motors are required in a normal tandem mill, whereas in this method only 1 or 2 motors are required. In this way, it is possible to easily produce thin plates that are larger than conventional ones in a small space and at low cost.
In addition, thin plate rolling can be easily realized by remodeling or newly installing this system on the exit side of the existing tandem mill.
Although the above has been described for cold rolling, it is clear that the same effect can be obtained by temper rolling.

  A method for preventing drawing or breakage of the rolled material that may be caused by the rolling method shown in the first to third embodiments will be described with reference to FIGS. 20 and 21. FIG. 20A shows the case of normal rotation (Vt> Vb), and FIG. 20B shows the case of reverse rotation (Vb> Vt). FIG. 21 shows a conventional offset method.

  In normal rolling mills, the center of the upper and lower work rolls is offset by the same amount in the same direction with respect to the vertical line connecting the reinforcement rolls, and the bearing box is pressed against the housing by the horizontal component force due to the rolling load to prevent rolls from crossing due to backlash. is doing.

  In the rolling mill of this example, when a rolling load is applied before rolling by the conventional offset method, the bearing box is pressed to the offset side, but when rolling starts, the frictional force at point A is up and down due to the different circumferential continuous rolling. When this force exceeds the horizontal component of the rolling load, one work roll in the set of work rolls moves in the opposite direction to the offset direction, and the parallelism of the upper and lower work rolls is distorted and drawn. There is a risk of breaking the plate. In order to prevent the occurrence of this phenomenon, the offset direction is matched with the direction of the frictional force.

That is, in FIG. 20A, the upper work roll 2 and the lower work roll 3 are offset in the opposite directions with respect to the center line L of the set of reinforcing rolls 4 and 5, and the work rolls 2 and 3 ( the direction of friction force μP by rolling load a), the rolling preventing squeezing and breakage of the rolled material by the horizontal component force P _H of the work rolls caused by contact load of each work rolls in the same direction by the offset Do. In FIG. 20 (A), the frictional force at point A acting on the work rolls 2 and 3 acts in the direction of the entry side because the peripheral speed of the upper work roll 2 is faster than the speed at point A of the rolled material. Since the peripheral speed of the roll 3 is slower than that of the rolled material, it acts on the exit side, and as a result, the direction at the point A of the friction force is reversed between the upper and lower work rolls. In the figure, it has a top work roll 2 to the left, and are offset a lower work roll 3 to the right, and a frictional force μP acting leftward and horizontal force P _H in the same direction.

FIG. 20B shows the case of reverse rotation, and the direction of the offset need not be changed even by reversible rolling.
The direction of the force pressing the work rolls 2 and 3 does not change before and after rolling, and does not change even in forward and reverse rolling.

In the conventional method shown in FIG. 21, Yes working rolls 2 and 3 are both in the same direction offset (to the right in the figure), after the pre-rolling P _{H (horizontal} component of the rolling load) rolling, lower work roll 3 horizontal force is P _{H +} .mu.P and the horizontal component force even upper work roll 2 composed of the same direction is the direction is opposite from P _H and _{P H -μP (μP> P H} ), the work roll 3 is working also fixed rolls 2 Moves by the amount of play, and roll backlash causes a plate drawing break. In order to prevent this with this method, the offset amount becomes excessive. 20 and 21, P represents a rolling load, μ represents a friction coefficient, and δ represents an offset amount.

The figure explaining a normal rolling system and a different peripheral speed rolling system. The figure which shows the relationship between the speed V and the frictional force (micro | micron | mu) P in relation to FIG. The figure explaining the conventional PV method. The figure which shows the structure of the 1st Example of this invention. The figure explaining the dependence to the rolling load of plate tension, and autonomy. The figure for demonstrating the autonomy of board tension. The figure which shows the structure of a different speed rotation drive device. The figure which shows the structure of the alternative of the different speed rotation drive device shown in FIG. The figure which shows the deformation | transformation of the example shown in FIG. The figure which shows the concept of this invention collectively. The figure explaining the problem to derive. The figure which shows the solution (1) of the said problem. The figure which shows the solution (2) of the said problem. The figure which shows the solution (3) of the said problem. The figure which shows the pressure distribution of the structure shown in FIG. The figure which shows the structure of the continuous tandem rolling mill which is a 2nd Example. The figure which shows the rolling load unified characteristic in a tandem. The figure which shows the relationship between the rolling reduction and tension | tensile_strength on the basis of rolling load constant. The figure which shows the structure of the modified Example which is a 3rd Example. The figure explaining the method of preventing the drawing or the fracture | rupture of the rolling material by a present Example. The figure explaining the method of preventing the drawing or fracture | rupture of the rolling material by the conventional method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Metal plate (rolling material), 2, 3 ... Work roll, 4, 5 ... Reinforcement roll, 11 ... Unwinding machine, 12 ... Winding machine, 13, 14 ... Deflector roller, 15, 16 ... Bridle roll, 17 , 18 ... tension meter, 20, 31 ... housing, 30 ... different speed rotation drive device, 100 ... rolling mill, 101 ... six-high rolling mill.

Claims (17)

In a rolling method that uses a rolling mill having at least a four-stage roll configuration of a set of work rolls and a set of reinforcing rolls that reinforce the work rolls, and performs rolling while changing the peripheral speed of both work rolls,
Both work rolls are driven at different peripheral speeds by different peripheral speed drive devices to operate as a high-speed work roll and a low-speed work roll, respectively, and before the rolling material passes between both work rolls (A), It is hung so that it passes between the reinforcing rolls (B ₁ ) to reinforce this, and after passing between both work rolls (A), it is hung so that it passes between the high speed side work roll and the other reinforcing roll (B ₂ ). The rolling load is applied to points A, B ₁ and B ₂ by the machine, and the rolling material speed on the inlet side is set to the peripheral speed of the low-speed work roll and the rolling material speed on the outlet side is increased by the frictional force at points B ₁ and B _2. Influence of friction on rolling by regulating rolling reduction ratio of rolling material by peripheral speed ratio of upper and lower work rolls by synchronizing with side work roll peripheral speed and removing neutral point from contact arc with rolling material at point A Disappears and is extremely thin with a large diameter work roll. Rolling method according to the rolling mill having a four-stage roll arrangement consisting of the aforementioned work roll and backup rolls, characterized by rolling.   In claim 1, the energy required for rolling is given by the difference between the exit side tension and the entry side tension at point A, and this tension difference is autonomously constant from the rolling load, and the rolling load is the tension on the entry / exit side. The four-stage roll is characterized in that when the rolling load is changed, the tension on the entry / exit side automatically corresponds to this and the rolling load is arbitrarily selected within the allowable range of the tension on the entry / exit side. A rolling method using a rolling mill having a configuration.   In Claim 1 or 2, the rolling load allowable range in which the lower limit value of the rolling load depends on the outlet side plate tension, the upper limit value depends on the inlet side plate tension is set, and the rolling load is within the rolling load allowable range. A rolling method using a rolling mill having a four-roll configuration, wherein the rolling method is autonomous with respect to a difference in plate tension between the side and the inlet side.   In claim 1, the upper work roll and the lower work roll are offset in opposite directions with respect to the center line of the set of reinforcing rolls, and the direction of the frictional force due to the rolling load between the two work rolls (A) and the offset A rolling method in which the horizontal component of the work roll generated by the contact load of each work roll is the same direction.   4. The method according to claim 1, wherein the upper and lower work rolls are shifted in opposite directions in the roll axis direction so that the end portions of the rolling material coincide with the roll end portions of the upper and lower work rolls, respectively. A rolling method using a rolling mill having a four-roll configuration.   6. The upper and lower work rolls of the upper and lower work rolls according to claim 5, wherein the upper and lower work rolls are opposed to each other in the roll axial direction, and the work rolls to be reinforced are shifted opposite to the roll shift direction. A rolling method using a rolling mill having a four-roll configuration. In a rolling mill comprising at least a four-stage roll configuration of a set of work rolls and a set of reinforcing rolls that reinforce the work rolls, and performing rolling while changing the peripheral speed of both work rolls,
Both work rolls are driven at different peripheral speeds by different peripheral speed drive devices to operate as a high-speed work roll and a low-speed work roll, respectively, and before the rolling material passes between both work rolls (A), It is hung so that it passes between the reinforcing rolls (B ₁ ) to reinforce this, and after passing between both work rolls (A), it is hung so that it passes between the high speed side work roll and the other reinforcing roll (B ₂ ). The rolling load is applied to points A, B ₁ and B ₂ by the machine, and the rolling material speed on the inlet side is set to the peripheral speed of the low-speed work roll and the rolling material speed on the outlet side is increased by the frictional force at points B ₁ and B _2. Influence of friction on rolling by regulating rolling reduction ratio of rolling material by peripheral speed ratio of upper and lower work rolls by synchronizing with side work roll peripheral speed and removing neutral point from contact arc with rolling material at point A Disappears and is extremely thin with a large diameter work roll. Rolling mill having 4-stage roll arrangement consisting of the aforementioned work roll and backup rolls, characterized by rolling.   In Claim 7, the energy required for rolling is given by the difference between the exit side tension and the entry side tension at point A, and this tension difference is autonomously constant from the rolling load, and the rolling load is the tension on the entering and exiting side. The four-stage roll is characterized in that when the rolling load is changed, the tension on the entry / exit side automatically corresponds to this and the rolling load is arbitrarily selected within the allowable range of the tension on the entry / exit side. A rolling mill having a configuration.   In Claim 7 or 8, the rolling load allowable range in which the lower limit value of the rolling load depends on the outlet side plate tension and the upper limit value depends on the inlet side plate tension is set, and the rolling load is within the rolling load allowable range. A rolling mill having a four-stage roll structure characterized by being made autonomous with respect to a difference in plate tension between the side and the inlet side.   The bridle roll is arranged side by side on the side of the work roll, and the rolling material is hung on the bridle roll. A tensiometer and a tachometer are installed on the bridle roll, and rolling is performed by the tensiometer. A rolling mill having a four-roll configuration, wherein a load allowable range limit is measured, and the elongation of the rolled sheet is measured with the tachometer.   8. The rolling mill having a four-stage roll structure according to claim 7, wherein the different circumferential speed drive device comprises a different speed gear, a twin drive device or a differential gear device.   8. The different peripheral speed drive device according to claim 7, wherein the other circumferential speed drive device is a roller group consisting of two sets of conical rollers or a combination of three sets of conical rollers and a cylindrical roller, and the other roller contacting the length of the cone roller or the cylindrical roller. A rolling mill having a four-roll configuration, comprising a rolling device comprising a group of rollers and selecting a specific conical roller or cylindrical roller to contact.   7. The six-high rolling mill according to claim 6, wherein an intermediate roll is provided between the work roll and the reinforcing roll instead of shifting the upper and lower reinforcing rolls, and the intermediate roll is shifted opposite to the shift direction of the work roll.   The rolling having a four-stage roll structure according to claim 7, wherein a roll surface length part on an end side of at least one work roll among the upper and lower work rolls is smaller in diameter than the center surface length part. Machine. In a rolling method that uses a rolling mill equipped with a set of work rolls and a reinforcing roll that reinforces the work rolls, and performs rolling while changing the peripheral speed of both work rolls,
Reinforcement roll (S1), work roll (W1), work roll (W2), reinforcement roll (S2), work roll (W3), work roll (W4), reinforcement roll (S3), ..., work roll (Wn) , A plurality of tandem rolling mills arranged like reinforcing rolls (Sn) are housed in one housing, and the rolling material passes between all the rolls in order, and 1 provided in the housing. A rolling load is applied between all the rolls with the use of one reduction device, and both work rolls are driven at different peripheral speeds to perform different peripheral speed rolling, and the frictional force between the work rolls and the reinforcing rolls causes the rolling material to move toward the outlet side. A four-stage roll characterized in that the neutral point between work rolls disappears and the energy required for rolling is supplied by giving a plate tension in which the difference between the plate tension and the plate tension on the inlet side is autonomous from the rolling load. Configuration Rolling method by rolling mill to be. In a rolling method in which rolling is performed by changing the peripheral speed of both work rolls using a rolling mill provided with a set of work rolls and a reinforcing roll for reinforcing the work rolls,
Reinforcement roll (S1), work roll (W1), work roll (W2), reinforcement roll (S2), work roll (W3), work roll (W4), reinforcement roll (S3), ..., work roll (Wn) In a rolling method in which rolling mills are arranged like a reinforcing roll (Sn) and a plurality of tandem rolling mills are housed in one housing, the rolling material sequentially passes between all work rolls and the reinforcing rolls. The rolling load is applied in common to all work rolls and reinforcing rolls by one reduction device provided in the housing, and all work rolls except for the work roll (Wn) of the final rolling mill are Driven by the drive unit, the speed ratio of the work rolls excluding the work roll (Wn) is set constant, and at least the work roll (Wn) is driven at a variable speed by the other drive unit. Rolling method according to the rolling mill having a four-stage roll arrangement, characterized in that the rolling mill having the rolls was set to carry out the rolling method of claim 1. In a rolling mill that uses a rolling mill provided with a set of work rolls and a reinforcing roll that reinforces the work rolls and performs rolling while changing the peripheral speed of both work rolls,
Reinforcement roll (S1), work roll (W1), work roll (W2), reinforcement roll (S2), work roll (W3), work roll (W4), reinforcement roll (S3), ..., work roll (Wn) In a tandem-type rolling mill in which each rolling mill is arranged on a reinforcing roll (Sn) and a plurality of tandem-type rolling mills are housed in one housing, the rolling material sequentially passes between all the work rolls and the reinforcing rolls. The rolling load is applied in common to all work rolls and reinforcing rolls by one reduction device provided in the housing, and all work rolls except for the work roll (Wn) of the final rolling mill are used. Driven by one drive unit, the differential speed ratio of the work rolls excluding the work roll (Wn) is set constant, and at least the work roll (Wn) is driven at a variable speed by another drive unit. Mill tandem arrangement, characterized in that the respective rolling mill and the rolling mill structure according to claim 1.

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