JPH0798285B2 - Ultra-thin metal strip slitting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, when slitting an ultrathin metal strip continuously in the length direction, provides a burr amount of a slitting portion from a predetermined amount to a predetermined amount or less. The present invention relates to a slitting method for an ultra-thin metal strip that can be carried out by pressing.

[Prior art]

In recent years, there has been a demand for downsizing and weight reduction of electric and electronic devices, and thus demand for ultra-thin metal strips having a plate thickness of 0.2 mm or less is rapidly increasing. The ultra-thin metal strips used for these purposes are manufactured in a wide width and then used by slitting them into a predetermined width according to the user's request. However, the demand from customers for improving slitting accuracy is strict.

In order to continuously slit a wide metal strip into a plurality of strips, generally, a pair of upper and lower circular blades whose blade edges are lapped is rotated while generating side pressure.
In this case, the clearance between the cutting edges during slitting is important in order to reduce the amount of burr in the slitting area.In the case of ultra-thin metal strips, the clearance during slitting should be as close to zero as possible. It is empirically well known that the lateral pressure of the is important. In order to make the clearance between the edges of both circular blades during slitting as close to zero as possible, a side pressure that resists the shear resistance of the metal strip to be slit is generated at least between the edges of the circular blades during slitting. There must be.

A conventional method for performing slitting by generating a lateral pressure between the cutting edges will be described with reference to the drawings. FIG. 9 is a partial cross-sectional explanatory view showing the inter-blade pressure generating method by the clearance adjusting paper, and FIG. 10 is a partial cross-sectional explanatory view showing the inter-blade pressure generating method by the coil spring.

One example of a conventional method for generating a lateral pressure between the pair of upper and lower circular blades 1 and 2 in which the blade edges are lapped is a method using a clearance adjusting paper. A circular blade 1 fixed in position by a lock nut 5 and a spacer 6 on a rotary shaft 3 on the upper side in the example, and a circular blade 2 on the other side (lower side in the example) on which the blade edge is lapped.
By the spacer 6 and the lock nut (not shown) and the clearance adjusting paper 7 further inserted between them on the rotary shaft 4 on the same side, the clearance between the blade edges is zero, that is, the two blade edges are in surface contact (in this state, The case where the side pressure is zero is theoretically included, but usually the positive side pressure is given.) The position of the body of the circular blades 1 and 2 (the part on the circle center side excluding the cutting edge) To adjust. In this method, the pressure between the cutting edges is not necessarily high during the suspension of slitting, but when slitting is started, the force to expand the clearance due to the shear resistance of the metal strip acts on the cutting edges of both circular blades 1 and 2, At this time, the movement of the positions of the body portions of both circular blades 1 and 2 stays only slightly, and as a reaction thereof, a pressing force is generated on the body portions and a large side pressure is generated between the blade edges.

Another example of the conventional method for generating a lateral pressure between the blade edges of the circular blades 1 and 2 is a method using a coil spring. As shown in FIG. 10, one of the upper and lower circular blades 1 (lower side in the example) is It is fixed to the rotary shaft 3 on the same side by a spacer 6, etc., and the circular blade 2 on the other side (upper side in the illustrated example) is attached to the rotary shaft 4 on the same side with zero clearance with the circular blade 1. 9 is the same as that shown in FIG. 9, but the spring force of the coil spring 9 mounted between the circular blade 2 and the holder 8 of the circular blade 2 acts on the body of the circular blade 2 as a pressing force. Is different in that a large lateral pressure is generated due to the fact that the blade edge is constantly pressed by the blade edge of the opponent circular blade 1, and during slitting, it is generated by the pressing force of the coil spring 9 against the body of the circular blade 2. Shear of metal strip due to lateral pressure between cutting edges It is an attempt to prevent the clearance expansion by anti. Although two sets (above) of the pair of upper and lower circular blades 1 and 2 are shown in FIGS. 9 and 10, the same applies to the case of only one set.

In the conventional slitting method, the side pressure is generated by the method using the clearance adjusting paper 7 or the method using the coil spring 9 as described above, but it has the following drawbacks.

That is, no matter which of the above methods is used as the side pressure generation method, the intuition and experience of the operator are strong, and the former adjusts the number of the clearance adjusting papers 7 for each type of the metal band to be slitted. The latter needs to be replaced with a coil spring 9 having a different spring force for adjustment, and the suitability of this adjustment is determined by making a trial cut and determining the burr amount by the tactile sensation of the back of a finger or the like. It was For this reason,
Since the amount of burr cannot be quantitatively controlled, the amount of burr varies among workers, making it impossible to obtain stable slitting accuracy. Further, when there are two or more slitting points in the ultra-thin metal strip, it is very difficult to make the slitting conditions the same at each point, and thus plate bending occurs. Further, the thickness of the clearance adjusting paper 7 and the spring force of the coil spring 9 change with time depending on the use conditions, but after setting both circular blades 1 and 2 at the start of slitting, the side pressure of the blade during slitting is set. Since it is difficult to adjust, the slitting is performed as it is until the slitting of the target coil is completed, so that a larger amount of burr is generated as the slitting time becomes longer.

[Problems to be solved by the invention]

The present invention solves the above-mentioned problems of the prior art, and provides a slitting method for an ultra-thin metal band capable of stably and continuously slitting by holding the burr amount below a predetermined amount from the start to the end of slitting. To aim.

For that purpose, how to detect the burr amount of the ultra-thin metal strip that is still running after slitting and what physical quantity should be controlled to keep it below a predetermined amount There was a problem that was difficult to solve.

[Means for solving problems]

As a result of various studies by the present inventors to solve the above problems, the relationship between the burr amount and the pressure between the cutting edges of the circular blade has a minimum value for each metal species and thickness of the target ultra-thin metal strip. By approximating a quadratic curve of the above, and combining this with the known linear relationship between the pressure between the cutting edges and the surface strain amount of the circular blade, the control of the burr amount is converted to the control of the surface strain amount of the circular blade. The present invention has been completed by researching what can be done.

That is, the present invention relates to continuously slitting an ultra-thin metal strip in the length direction while rotating a pair of upper and lower circular blades whose edges are lapped with a side pressure generated between the blade edges. For a thin metal strip, a quadratic curve having a minimum value that is approximately established between the burr amount Y produced by slitting and the inter-blade pressure P is obtained, and the inter-blade pressure P corresponding to the burr amount Y of a predetermined amount or less is obtained. Is determined, and then the proportional relationship between the pressure P between the cutting edges and the amount of surface strain of the circular blade to be used is obtained to determine the appropriate surface strain of the circular blade corresponding to the above range of the pressure P between the cutting edges. After determining the amount range, while continuously measuring the surface strain amount of the circular blade, the pressure P between the blade edges is adjusted to maintain the state within the above-mentioned appropriate range for continuous slitting. How to slit metal strips It relates.

Hereinafter, a method for slitting an ultrathin metal strip according to the present invention will be described in detail with reference to the drawings.

Figure 1 shows SUS304, and Figure 2 shows cold rolled steel strip (SPC).
A diagram showing a quadratic curve that approximates the relationship between the pressure between the cutting edges and the amount of burr during slitting, and
FIG. 3 is a diagram showing the relationship between the burr amount and the pressure between the cutting edges when the lapping amount of the circular blade is changed, and FIGS. 4 (a), (b) and (c) show the magnitude of the cutting edge side pressure and The figure which shows typically the relationship with the contact state of a circular blade, FIG. 5 is a figure which shows the relationship between the pressure between blade edges, and the surface strain amount of a circular blade, FIG. 6 is a schematic which shows the order of implementation of the method of this invention. Explanatory drawing, FIG. 7 is an explanatory view showing an example of a slitting execution state by the method of the present invention, and FIG. 8 (a).
And (b) are diagrams showing variations in the amount of burr with respect to the length from the slitting starting point when slitting is continuously performed by the method of the present invention and the conventional method, respectively.

[Description of configuration]

In the method of the present invention, the ultrathin metal strip is continuously slitted in the lengthwise direction while rotating a pair of upper and lower circular blades 1 and 2 whose blade edges are lapped with a side pressure P generated between the blade edges. The point is the same as in the prior art, and first, a quadratic curve having a minimum value that is approximately established between the burr amount Y and the inter-blade pressure P that occur when slitting is performed on an ultrathin metal band to be slitted. To ask.

The burr amount Y is a physical quantity obtained by quantifying the burr height, and the measurement is based on a method of measuring the burr height with a surface roughness meter. The pressure P between the cutting edges of the circular blades 1 and 2 is measured in a laboratory by attaching a strain gauge to the side surface of the circular blade 2 and applying a load to the tip of the blade to measure the amount of strain on the blade surface and the load. A relationship is obtained in advance, and the inter-blade pressure P generated during actual slitting is estimated from this relationship from the blade surface strain amount detected by the strain gauge.

For example, the relationship between burr amount (μm) and blade edge pressure (kgf) when slitting SUS304 with a thickness of 0.05 mm under conditions that generate various blade edge pressures is shown in Fig. 1. It becomes like this. In this experiment, three types of circular blades made of die steel, powder high-speed steel, and cemented carbide were used as circular blades 1 and 2 as shown in Fig. 1 in order to provide strength corresponding to various pressures between the cutting edges. 1,2 were used. By drawing a curve that most closely represents the distribution state of each dot obtained in this way, a quadratic curve A having a minimum value is obtained as shown in FIG. Although the quadratic curve A can be easily obtained by drawing in this way, it can also be obtained as follows.

That is, the following quadratic equation Y = aP ² + bP + c (1) is established with respect to Y and P, and the coefficients a, b and c are calculated by a known method from a plurality of experimental numerical values of Y and P described above. The quadratic curve A can be obtained by determining the equation (1) using Therefore, the coefficients a, b, and c are coefficients that change depending on the metal species and thickness of the thin film metal strip to be slit. In the case of SUS304, Y = 33 × 10 ⁻⁴ P ² −5.6 × 10 ⁻² P + 2.9.

Another example is a cold rolled steel strip (SPC) with a thickness of 0.05 mm.
The same experiment as above was performed to obtain the quadratic curve B having the minimum value from the dots shown in FIG. The quadratic equation (1) showing the quadratic curve B was Y = 1.6 × 10 ⁻⁴ P ² −20 × 10 ⁻² P + 1.1.

The relationship between the burr amount Y and the inter-blade pressure P is
It was found from the following experimental results that the material of both circular blades 1 and 2 and the size of the amount of lapping between the blade edges are irrelevant. That is, Fig. 3 shows the case of slitting a cold-rolled steel strip with a thickness of 0.05 mm by adjusting the lap amount of circular blades 1 and 2 of various materials to three types of 0.5 mm, 1.0 mm and 1.5 mm for each material. The relationship between the burr amount Y and the inter-blade-side pressure P is shown, and the above facts can be understood from the fact that all dots are on one line.

Thus, the relationship between the burr amount Y and the inter-blade pressure P is not related to the material of the circular blades 1 and 2 and the lapping amount between the blade edges, and the minimum value of the burr amount Y, that is, the burr amount Y is minimized. It has been empirically revealed that there is a pressure P between the cutting edges. This means that the burr amount Y is centrally determined by the inter-blade pressure P regardless of the material of the circular blades 1 and 2 and the lapping amount thereof, and the preferable range of the burr amount Y is defined as It shows that it can be converted into a range. The reason for this can be considered as follows. Fourth
The figure shows the size of the inter-blade side pressure P generated by the pressing force F acting on the body of the circular blade 1 fixed in position and the circular blade 2 that wraps between the blade edges, and the shear resistance of the metal band generated during slitting. The relationship between K and the contact state of the cutting edge is schematically shown in three stages.

In FIG. 4 (a), the pressure P between the cutting edges and the shear resistance K are P <
Due to the relationship of K, a clearance is generated between the circular blades 1 and 2, and in FIG. 4 (B), P = K, the blade edges are in surface contact with each other, and the clearance is zero. ) Then P
When> K, the side pressure P is too strong, and the blade edges come into line contact with each other to cause clearance. The generation and size of this clearance are reflected in the occurrence of burr and the amount of burr during slitting. Therefore, when the side pressure P is small, for example, when the clearance adjusting paper 7 is inserted between the spacers 6 and the pressing force F acting on the barrel portion of the circular blade 2 is increased, the side pressure P is increased. Since the equilibrium state is reached with the shear resistance K and slitting can be performed in the state of surface contact, the amount of burr Y is minimized. When the side pressure P is further increased, the side pressure P becomes stronger against the shear resistance K,
Since the contact between the two cutting edges is in the line contact state, the clearance becomes "plus" and the burr amount Y increases on the contrary. From such a change in the contact state of the two cutting edges, it is considered that a quadratic relationship having a minimum value is established between the burr amount Y and the side pressure P, and this relationship has circular blades 1, 2 The material and the size of the lap do not come in as factors.

Next, in the method of the present invention, a proportional relationship established between the inter-blade pressure P to the blade of the circular blade 2 to be used and the surface strain amount ε of the circular blade 2 is obtained in advance.

This proportional relationship is expressed by the following relational expression (2) P = dε (2). Here, d is a coefficient relating to the material and size of the circular blade 2, the measurement point on the circular blade, and the like. It is well known that the relational expression (2) always holds if the surface strain amount ε of the circular blade 2 is due to the deformation of the blade within the elastic limit of the material, and that P and ε have a comparative relationship. ing. For example, a strain gauge is attached to the side of a circular blade made of various materials and having a thickness of 5 mm and a diameter of 170 mm at a position 3 mm in the center direction from the tip of the blade, and strain is applied to the lead wire previously embedded in the rotary shaft 3. When the relationship between the side pressure (kgf) and the surface strain amount (× 10 ^-6 ) was tested in addition to the blade edge by the method of connecting the gauge and measuring the blade surface strain amount with the strain amplifier through the slip ring. A linear relationship was obtained as shown in FIG. In this way, the proportional relationship between P and ε may be obtained as a chart, not in the form of equation (2).

According to the method of the present invention, a quadratic curve (hereinafter referred to as YP) showing the relationship between the burr amount Y and the pressure P between the cutting edges of the circular blades 1 and 2 as described above.
And a proportional relationship between the side pressure P applied to the cutting edge of the circular blade 2 and the surface strain amount ε at a constant measurement point (hereinafter, may be referred to as Pε proportional relationship). After obtaining, follow the sequence shown in FIG. That is, the limit values P ₁ and P ₂ of the pressure P between the two cutting edges corresponding to the limit value y of the burr amount Y required from the application of the ultrathin metal strip to be slitted are obtained from the YP quadratic curve. Thereby, the proper range of the pressure P between the cutting edges is determined as P ₁ <P <P ₂ . Next, the surface strain amounts ε ₁ and ε ₂ of the circular blade 2 corresponding to the above-described limit values P ₁ and P ₂ of P are determined from the P ε proportional relationship. Thereby, the appropriate range of the amount of surface strain ε is determined as ε ₁ <ε <ε ₂ .

On the other hand, an adjustable pressing means for applying a pressing force F to the body portion of the circular blade 2 is attached to the rotational shaft 4 via a spacer 6 which positions the circular blade 2 at a substantially suitable position on the rotational shaft 4.
As this pressing means, there is shown a means (not shown) for applying a pressing force by a hydraulic system or an electric system via a spring 11 as shown in FIG. As a specific example, a structure using a pressing system is such that a ring-shaped hydraulic cylinder mechanism is held on the rotating shaft 3 and the pressing force is controlled by hydraulic pressure, and a rotating system using an electric system is a rotating shaft. 3 shows a structure having a pressing adjustment screw mechanism and controlling the pressing force by an electric screw moving amount.

When the proper range of ε is determined as described above, slitting is finally started. Before that, the strain gauge 10 is attached so that the surface strain amount of the circular blade 1 can be measured. This mounting is such that the measuring point on the circular blade 1 by the strain gauge 10 is at the same position as when the YP quadratic curve is obtained. When slitting at a plurality of locations, the strain gauge 10 is attached to each of the plurality of circular blades 1 as shown in FIG. 7, and the pressing means is also attached accordingly.

Once the above preparations have been completed, slitting of a wide ultra-thin metal strip will start. Then, slitting is performed while adjusting the pressing means so that the surface strain amount ε by the strain gauge 10 is always in the proper range ε ₁ <ε <ε ₂ . In the case where there are a plurality of slitting points, in order to make the burr amount Y of each part less than or equal to the same limit value y of the burr amount, the surface strain amounts ε may be set in the same range.

In the method of the present invention, the amount of surface strain ε is detected, and this is checked with respect to the proper range, and the result is fed back to operate the pressing means so that the amount of surface strain ε is within the proper range to perform the correction operation. , Etc. can be easily automated by using recent control technology.

[Work]

In the method of the present invention, by controlling the surface strain amount ε of the circular blade 1 by the strain gauge 10 so that the proper range is always in the range of ε ₁ <ε <ε ₂ , the circular blade 1.
The pressure P between the two cutting edges is in the proper range P ₁ <P <P ₂ , so that the burr amount Y generated by slitting from the YP quadratic curve becomes a predetermined limit value y or less, and the circular blade Since the surface strain amount ε of 1 can be easily corrected by the pressing means even during slitting, the slitting can be continuously and stably controlled while being controlled within the proper range from the start to the end of slitting.

〔Example〕

When continuous slitting is performed at two positions of a SPC (cold rolled steel strip) having a plate thickness of 50 μm by the method of the present invention in the same manner as in FIG. 7, and the operator only adjusts the circular blade before starting the slitting. Regarding the case of going by the conventional method of
After finishing the slitting, one of the four shear planes newly formed by the slitting at two locations is selected, and the burr amount (μ
The results of examining m) are shown in FIGS. 8A and 8B, respectively. As can be seen from the figure, the amount of burr and the variation in the method of the present invention are smaller than those in the conventional method. Further, even if the slitting time is long, the change in slitting condition is corrected and kept constant, so that the burr amount hardly changes, and stable slitting accuracy is obtained. Even when slitting was performed at two points at the same time, since the slitting condition at each slitting point was made the same by the surface strain amount ε, the plate bending hardly occurred. On the other hand, in the method according to the conventional technique, the phenomenon of plate bending was observed.

〔The invention's effect〕

According to the method of the present invention, the control of the burr amount is converted into the control of the surface strain amount of the circular blade to control even during slitting, so that the slitting condition is corrected even if the slitting is continuously performed for a long time. The amount of burr can be maintained below the limit value. Therefore, there is no variation in the amount of burr caused by differences in workers, the amount of burr can be reduced, and it is possible to prevent the amount of burr from increasing over time, and also to eliminate plate bending. As a result, it is possible to slit the curved thin film metal strip continuously and stably so as to have such a highly accurate sheared surface.

[Brief description of drawings]

Figure 1 shows SUS304, and Figure 2 shows cold rolled steel strip (SPC).
A diagram showing a quadratic curve that approximates the relationship between the pressure between the cutting edges and the amount of burr during slitting, and
FIG. 3 is a diagram showing the relationship between the burr amount and the pressure between the cutting edges when the lapping amount of the circular blade is changed, and FIGS. 4 (a), (b) and (c) show the magnitude of the cutting edge side pressure and The figure which shows typically the relationship with the contact state of a circular blade, FIG. 5 is a figure which shows the relationship between the pressure between blade edges, and the surface strain amount of a circular blade, FIG. 6 is a schematic which shows the order of implementation of the method of this invention. Explanatory drawing, FIG. 7 is an explanatory view showing an example of a slitting execution state by the method of the present invention, and FIG. 8 (a).
And (b) are views showing a variation state of the burr amount with respect to the length from the slitting starting point when continuously slitting by the method of the present invention and the conventional method, and FIG. FIG. 10 is a partial cross-sectional explanatory view showing the inter-side pressure generating method, and FIG. 10 is a partial cross-sectional explanatory view showing the inter-blade pressure generating method by the coil spring. 1 …… Circular blade 2 …… Circular blade 3 …… Rotary axis 4 …… Rotary axis 5 …… Lock nut 6 …… Spacer 7 …… Clearance adjustment paper 8 …… Holder 9 …… Spring 10 …… Strain gauge 11 …… spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akinobu Takezoe, 5 Ishizushi Nishimachi, Sakai City, Osaka Prefecture, within the Hanshin Institute of Nisshin Steel Co., Ltd. (56) Bibliography 61-85313 (JP, U) -28782 (JP, U) Actually opened 54-109981 (JP, U)

Claims (1)

[Claims] 1. A pair of upper and lower circular blades whose blade edges are lapped is rotated in a state in which a lateral pressure is generated between the blade edges while continuously slitting an ultrathin metal strip in the lengthwise direction. For a thin metal band, a quadratic curve having a minimum value that approximately holds between the burr amount (Y) generated by slitting and the pressure (P) between the cutting edges is obtained, and the burr amount (Y) of a predetermined amount or less is obtained. The proper range of the inter-blade pressure (P) is determined, and then the proportional relationship between the inter-blade pressure (P) and the surface strain amount of the circular blade to be used is obtained to determine the inter-blade pressure (P). After determining the proper range of surface strain of the circular blade corresponding to the proper range, maintain the state within the proper range by adjusting the pressure (P) between the cutting edges while measuring the surface strain of the circular blade. Ultra thin metal characterized by continuous slitting Suritsuteingu methods.