JP2755167B2 - How to prevent wrinkles from occurring when winding a metal band - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a metal strip such as an extremely thin steel plate is wound on a take-up reel, and wrinkles of an interleaf strip inserted between the metal strips to be wound are transferred and generated. The present invention relates to a method for preventing generation of wrinkles in an interleaf strip in order to prevent surface flaws.

[0002]

2. Description of the Related Art In a process of manufacturing a metal strip, for example, cold temper rolling of an ultra-thin steel sheet, a stainless steel sheet, etc., annealing pickling, a final inspection line, etc., a work of winding the metal strip is involved.

[0003] At this time, if the surface of the metal strip is in direct contact with the metal strip to be wound, rubbing or friction generates slip marks or oyster marks on the surface of the metal strip. In particular, in the case of final products that have a low surface roughness and require glossiness, such as ultra-thin steel sheets such as bright steel sheets and stainless steel sheets,
These slip flaws and oyster flaws significantly lower the commercial value and the product yield. In order to prevent this, a measure has been taken to insert an interleaf strip having a width substantially equal to the width of the metal band between the metal bands to be wound.

FIG. 5 is a view for explaining a schematic configuration of an apparatus for inserting a slip sheet between a metal strip rolling line and a metal strip to be wound. The metal strip 1 unwound from the coil 1c wound on the metal strip unwinding reel 4 is rolled to a predetermined thickness by the rolling mill 3 through a deflector roll (direction changing roll) 10. After that, the direction is changed by the deflector roll 10 on the winding side, the vehicle is driven to the winding reel, wound on the winding reel 6, and wound to form the coil 1c. At this time, the interleaf strip 2 unwound from the interleaf strip unwinding reel 5 travels to the insertion position while being supported by the support rolls 11 and is continuously wound between the metal strips 1. Is inserted into.

When winding a metal band while inserting a slip band to produce a coil 1c, if wrinkles occur in the slip band, it is transferred to the metal band as it is and becomes surface flaws, thereby deteriorating the quality of the product. Was. Furthermore, since the interleaf strip becomes uneven in thickness with the occurrence of wrinkles, the metal strip to be wound meanders, the edges of the coil become uneven, and the balance of the coil is lost when the coil is transported by a crane in a later process. The bent portion of the edge portion adversely affects the yield of the final product. In addition, the occurrence of wrinkles causes a problem that the slip-sheet band breaks during the insertion operation, which lowers the work efficiency.

As a countermeasure for preventing the occurrence of wrinkles in the slip sheet, the following inserting method of the slip sheet has been conventionally proposed.

Based on the knowledge that wrinkles generated in the slip band can be eliminated by applying a high tension, a plurality of guide rolls are arranged between the slip band take-up reel and the metal band take-up reel. There is a method of applying a high tension to the slip sheet (see, for example, JP-A-1-33611).

However, when this proposed method is applied to a production line for a metal band, the interleaf paper band has a lower bending rigidity than the metal band, and the effect of the crown (the convex shape of the cross section of the metal band) attached to the metal band. In addition, despite the high tension applied to the interleaf strip, wrinkles and breaks occur at the center in the width direction of the interleaf strip at the time of contact with the metal strip. Further, since a large number of guide rolls are arranged between the take-up band take-up reel and the metal band take-up reel, if a trouble such as breakage of the take-up band occurs for some reason,
There is a problem that the recovery work takes time.

Next, as a method for mechanically preventing wrinkles generated in the slip sheet, wrinkles (wavy) are formed immediately before the take-up reel.
There has been proposed a method of providing an erasing roll and pressing the roll against a metal strip to prevent wrinkles from occurring (see, for example, JP-A-1-289509). However, in this method, it is necessary to press the roll for eliminating wrinkles (undulations) against the metal band, so that friction between the roll and the metal band may cause surface flaws such as slip flaws, which may result in deterioration of product quality. There is.

[0010]

Conventionally, when inserting a slip sheet between the wound metal strips while winding the metal strip on a take-up reel, wrinkles generated in the inserted slip strip are conventionally considered. There was no proper way to prevent it. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for easily preventing wrinkles from occurring in an interleaf strip without requiring a special device when inserting the interleaf strip.

[0011]

The gist of the present invention, as shown in FIGS. 1 and 3, is the following (1) and (2) methods for preventing the occurrence of wrinkles in a slip sheet.

(1) When inserting the interleaf strip 2 between the wound metal strips 1 while winding the metal strip 1 on the take-up reel 6, the metal strip 1 travels between the deflector roll 10 and the take-up reel 6. The angle α formed by the metal strip 1 and the slip sheet 2 running between the last support roll 11 and the take-up reel 6 among the support rolls provided between the slip sheet unwinding reel and the take-up reel is defined as A method for preventing generation of wrinkles in an interleaf band at the time of winding a metal band, wherein the range is 40 ° to 300 ° (see FIG. 1).

(2) When inserting the interleaf strip 2 between the wound metal strips 1 while winding the metal strip 1 on the take-up reel 6, a plurality of interleaving strips 5 are disposed between the unwinding reel 5 and the take-up reel 6. The slip-sheets 2 inserted between the metal strips 1 after running on the support rolls 11 provided are θ ₁ > θ ₂ and θ ₂ <70.
A method for preventing wrinkles from occurring when winding a metal band, comprising running between an unwinding reel, a support roll and a take-up reel under the condition of ° (see FIG. 3).

However, θ ₁ is the final support roll 11c
Is the angle formed by the interleaf strip 2 traveling on the entry side of the support roll 11b and the interleaf strip 2 traveling on the exit side of the last support roll 11b, and θ ₂ is the final support roll. 11c
Is an angle formed by bending the roll between the slip band 2 traveling on the entry side and the slip band traveling on the exit side.

It is desirable that any one of the above support rolls is an expanded roll.

[0016]

One of the causes of wrinkles in the slip sheet is that air is simultaneously drawn in when the sheet is inserted into the metal strip.
If the air entrained between the metal band and the interleaf band can be extracted, the generation of wrinkles in the interleaf band can be reduced, and surface defects of the metal band due to transfer can be prevented.

FIG. 1 is a view for explaining a schematic positional relationship between a metal band, a paper band, and a take-up reel when a paper band is inserted between metal bands. The interleaf strip 2 is wound on the take-up reel 6 and travels while being supported by the support roll 11, and is inserted between the metal strips 1 to form the coil 1c. When there are a plurality of support rolls, the roll 11 is the last support roll. Here, α in the figure is expressed as an angle formed by the metal band 1 running between the deflector roll 10 and the take-up reel 6 and the slip-sheet band 2 running between the support roll 11 and the take-up reel 6. FIG. 1A shows a case where α is an included angle, and FIG.
(B) shows a case where α is a wide angle.

As is clear from FIG. 1, after the slip-sheet band 2 comes into contact with the coil 1c of the metal band already wound on the take-up reel 6, it is sandwiched between the metal bands through a certain contact length L. Inserted. Therefore, in order to extract the air entrained by the contact of the interleaf strip 2, the metal strip coil 1c
It is effective to increase the time from contact with the metal strip to being sandwiched between the metal strips. In order to lengthen this time, the contact length L may be increased assuming that the winding speed of the rolling line is constant. For this purpose, it is advantageous to increase the above-mentioned α in the configuration shown in FIG. Based on such knowledge, the first invention has been completed.

In the operation of the rolling line, the diameter of the coil wound on the take-up reel increases with the progress of the metal strip rolling, so that the contact position of the slip sheet changes and α changes.

The present inventors have studied the range of α which must be ensured during winding of the metal strip.

FIG. 2 is a diagram showing the relationship between the wrinkle occurrence rate of the slip-sheet band and α. However, the winding speed v was kept constant at 80 m / min, and the wrinkle generation rate was evaluated based on the wrinkle transfer flaws generated on the steel strip, and expressed by the length ratio of the generated wrinkle transfer flaws. The conditions of θ ₁ and θ ₂ described later were θ ₁ = 130 ° and θ ₂ = 140 °, respectively.

As shown in FIG. 2, if α is an included angle of about 10 °, it is not possible to secure a sufficient time for extracting the entrapped air and the wrinkle generation rate is high, but α is 40 °. The wrinkles generated in the slip-sheet band are reduced when the angle is close to the above, and almost no wrinkles are observed when the angle exceeds 45 °.

Therefore, during winding of the metal band, α is 40
By setting the position of the support roll 11 so as to be equal to or more than one degree, wrinkles can be prevented from occurring even when the slip sheet is continuously inserted between the metal strips.

On the other hand, when α exceeds 300 °, the running position of the slip-sheet band changes remarkably with the increase in the diameter of the coil wound on the take-up reel. The upper limit of α was set to 300 ° because of inconvenience in terms of surface. Therefore, during winding of the metal strip, α
By adjusting the position of the support roll 11 so that the angle falls within the range of 40 ° to 300 °, wrinkles of the slip sheet can be prevented.

Another factor that causes wrinkles in the slip sheet is slack in the width direction of the slip sheet. Preventing this slack in the width direction is the gist of the second invention, and
It was completed based on the findings of

One or a plurality of support rolls are provided between the take-up reel and the take-up reel, and the distance that the slip band travels between the rolls is shortened, thereby forming a wavy shape in the width direction. Can be prevented from becoming loose. In particular, the effect becomes remarkable by reducing the traveling distance between the final support roll and the take-up reel.

As described above, the provision of the support roll is effective for preventing the slippage of the slip sheet from being loosened when the slip sheet comes into contact with the support roll in the longitudinal direction of the slip sheet, that is, the running direction of the slip sheet. This is because a tension in the width direction is generated, and the slack in the width direction is limited. The tension required here does not need to be the strong tension proposed in the above-mentioned Japanese Patent Application Laid-Open No. 1-133611, and with this level of tension, it is possible to prevent the slip of the slip-sheet band.

When a plurality of support rolls are provided,
The tension generated in the slip sheet is not uniform, and the arrangement of the support rolls is important.

FIG. 3 is a diagram for explaining a running state of the metal band and the slip sheet band when three support rolls are provided. The metal strip 1 runs between the deflector roll 10 and the take-up reel 6, while the slip-sheet strip 2 runs between the unwind reel 5 and the take-up reel 6 by supporting the support rolls 11a, 11b and 11c. The traveling distance between the rolls is reduced.
Here, θ ₁ in the figure indicates that the slip sheet 2 traveling on the entrance side of the support roll 11b and the slip sheet 2 traveling on the exit side just before the final roll bend the roll 11b. is an angle that constitutes, theta _2, the final support interleaving paper band 2 and is the roll running slip sheet band 2 and egress for traveling entrance side of the roll 11c
11c.

On the assumption that three support rolls are arranged as shown in FIG. 3, the wrinkle occurrence rate of the slip sheet was investigated.

FIG. 4 is a diagram showing the wrinkle occurrence rate of the slip-sheet band when θ ₂ is changed by adjusting the arrangement of the support rolls while keeping θ ₁ constant. Here, the winding speed v is 1
The rate of wrinkling was measured in the same manner as in FIG. The condition of α described above was α = 27 °.

As is apparent from FIG. 4, θ ₂ is θ ₁ (1
(00 °), the wrinkle generation rate decreases extremely. Furthermore, theta ₂ is little wrinkles encountered when a 70 ° or less.

Therefore, by adjusting the arrangement of the support rolls so as to satisfy the following conditions (a) and (b), it is possible to prevent wrinkles occurring in the slip sheet.

Θ ₁ > θ ₂ ... Condition (a) θ ₂ <70 °... Condition (b) Note that if these conditions are satisfied, α may not be 40 ° or more.

Further, reducing the difference in tension in the width direction generated in the slip sheet is effective in reducing the slack. For this reason, one or more of the support rolls installed between the unwinding reel and the take-up reel of the interleaf strip should be replaced with expanded rolls provided with a shock absorber such as a spring at the roll support end. desirable. Using the buffer mechanism of the roll, reduce the tension difference in the width direction of the slip sheet,
This is because the occurrence rate of wrinkles in the metal strip can be reduced.

The effects of the first and second aspects of the present invention will be specifically described below with reference to examples.

[0037]

EXAMPLE A cold rolled ultra-thin steel strip was wound on a winding line having the structure shown in FIG. Take a test. In each case, the ultra-thin steel strip used is made of material SUS 304
(JIS standard), thickness 0.3 mm, width 1025 mm, and the line speed of the winding line was 80 m / min.

(Example 1) A single support roll is provided between a take-up reel and a take-up reel, and a metal belt, a support roll, and a take-up reel which travel between the deflector roll and the take-up reel. Was adjusted so as to be within a predetermined range during winding, and the occurrence rate of surface flaws due to wrinkle transfer of the steel strip was examined. The rate of occurrence of surface flaws was examined based on the length ratio of the generated wrinkle transfer flaws. The results are shown in Table 1.

[0039]

[Table 1]

As shown in the results of Table 1, α is 40 to 300 °.
Outside the range, surface flaws generated in the steel strip increase.

(Embodiment 2) Next, as shown in FIG. 3, three support rolls are provided between the take-out reel and the take-up reel, and θ ₁ and θ ₂ are respectively changed. The occurrence of surface flaws due to wrinkle transfer on the steel strip was investigated. In some cases, expanded rolls were used for support rolls 11b. Table 2 summarizes the results.

[0042]

[Table 2]

As is clear from Table 1, when the slip-paper strip is run under the conditions of θ ₁ > θ ₂ and θ ₂ <70 °, the surface flaw generated on the steel strip was small. In particular, when an expand roll is used, the occurrence of surface flaws on the steel strip is significantly reduced.

[0044]

According to the present invention, it is possible to prevent surface flaws due to wrinkle transfer generated on a metal band by modifying equipment at low cost without requiring special equipment. Furthermore, since a simple roll arrangement can be provided around the take-up reel, it is possible to contribute to automation of handling and improvement of equipment layout.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic positional relationship between a metal band, a paper band, and a take-up reel when a paper band is inserted between metal bands. FIG. 1A illustrates a case where α is an included angle. (B) shows a case where α is a wide angle.

FIG. 2 is a diagram showing the relationship between the wrinkle occurrence rate of an interleaf strip and α.

FIG. 3 is a diagram illustrating a traveling state of a metal band and a slip sheet band when three support rolls are provided.

FIG. 4 is a diagram showing the wrinkle occurrence rate of the slip sheet band when θ ₂ is changed by adjusting the arrangement of the support rolls while keeping θ ₁ constant.

FIG. 5 is a diagram illustrating a schematic configuration of an apparatus for inserting an interleaf strip between a metal strip rolling line and a metal strip to be wound;

[Explanation of symbols]

1 ... metal strip, 1c ... metal strip coil, 2 ... interleaf strip, 3
... Rolling machine 4 ... Metal band unwinding reel, 5 ... Slip-sheet unwinding reel, 6
... take-up reel 10 ... deflector roll, 11, 11a, 11b, 11c ... support roll

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-339519 (JP, A) JP-A-3-161119 (JP, A) JP-A-3-161118 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) B21C 47/00-49/00 B21B 39/16

Claims (1)

(57) [Claims] When inserting an interleaf band between wound metal bands while winding the metal band on a take-up reel, a plurality of support rolls are provided between the unwinding reel and the take-up reel. After running, the interleaf strip inserted between the metal strips is an unwinding reel under the conditions of θ ₁ > θ ₂ and θ ₂ <70 °,
A method for preventing wrinkles from occurring when winding a metal band, comprising running between a support roll and a take-up reel. Here, θ ₁ is an angle formed by a paper slip band traveling on the entrance side of the support roll immediately before the final support roll and a paper slip band traveling on the output side surrounding the roll, and θ is defined as θ 1. ₂ is the angle and slip sheet strip traveling slip sheet band with the exit side that travels entrance side of the final support roll is constituted by囲撓the roll.