JPS62279038A - Manufacture of embossed metal strip - Google Patents

Abstract

PURPOSE:To prevent the generation of a camber at the rolling time of an embossing by arranging the dull roll of the roughness complied with the embossing pattern in opposing to the roll with pattern and adjusting the rolling reduction rate of both rolls. CONSTITUTION:The dull roll 2B rolling a metal strip 1 together with a patterned roll 2a is arranged in opposition to the patterned roll 2A subjected to an embossing. The roughness of the dull roll 2B is selected according to the embossing pattern and the rolling reduction rates of both rolls 2A, 2B is adjusted according to the embossing pattern. For example, in case of the embossing pattern being fine and complicated, the surface roughness of the dull roll 2B is made larger and the rolling reduction rate is made smaller. In case of the embossing pattern being simple, the reverse setting to the above is made. In this way the C camber of the embossing pattern giving rolling time can be prevented and the yield of the product is improved.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a method for manufacturing embossed metal strips.

[Prior art] As a method for manufacturing an embossed steel strip, there is
As described in Japanese Patent No. 2801, a patterned roll embossed with a predetermined pattern by etching, electric discharge machining, etc. is used as either the upper work roll or the lower work roll during rolling. As the other side of the work roll.

A regular bright finish roll is used.

[Problems to be Solved by the Invention] However, since the pattern of the embossed steel strip has a design quality, different patterns are adopted depending on the consumer. If the pattern is complicated, a bow-shaped warp (zero warp) occurs in the width direction of the copper strip during rolling, as shown in FIG. 4.

The above-mentioned zero warpage causes scratches after rolling, for example, during continuous annealing process, and also causes the embossed pattern to be destroyed when warping is corrected in the skin pass rolling process after annealing, resulting in a reduction in product value. be.

An object of the present invention is to make it possible to prevent the occurrence of warpage during rolling of an embossed pattern.

[Means for Solving the Problems] The present invention provides a method for manufacturing an embossed metal strip in which a metal strip is rolled by an embossed patterned roll and an embossed pattern is imparted to the metal strip. A dull roll with a roughness corresponding to the embossed pattern is used as a roll that rolls the metal strip together with the patterned roll, and the rolling reduction ratio of the patterned roll and the dull roll is adjusted according to the embossed pattern. .

[Function] The present inventor noticed that C warping is: (1) warping in a state in which the side of the metal band in contact with the patterned roll is convex, and (2) the degree of warping differs depending on the embossed pattern. In other words, C warpage is caused by the difference in the amount of plastic deformation in the width direction between the upper and lower surfaces of the metal strip, and if the difference in the amount of plastic deformation in the width direction between the upper and lower surfaces is eliminated, the occurrence of C warp can be prevented. Preventable.

Generally, when rolling a metal strip under high tension,
The width of the metal band shrinks. When a patterned roll with large irregularities on the roll surface is used on one of the upper and lower surfaces of the metal strip, and a bright finish roll is used on the other upper and lower surface, a large restraining force is exerted by the roll on the side of the metal strip that is in contact with the patterned roll. As a result, the metal strip shrinks in the width direction without applying a large restraining force to the side in contact with the bright finishing roll, and as a result, the metal strip shrinks in the width direction on the side in contact with the patterned roll. Produces a convex C warp. Note that the warpage of the metal strip in the rolling direction is corrected by the tension applied during rolling.

Therefore, when rolling using patterned rolls, we conducted experiments by changing the surface roughness of the rolls placed opposite to the patterned rolls, and ■ the rolling reduction ratio. It was confirmed that it was possible to prevent the occurrence of C warpage. That is, (a) when the embossed pattern is fine and complex, (1) the roll placed opposite to the patterned roll is used as a dull roll to increase its surface roughness;
By reducing the rolling reduction ratio and (b) when the embossed pattern is simple, it is possible to prevent the occurrence of C warpage by setting the conditions opposite to (1) and (2) above. When the embossed pattern is fine and complex, the purpose of increasing the roughness of the dull roll placed opposite the patterned roll is to suppress plastic deformation in the width direction, and the purpose of reducing the rolling reduction is to increase the roughness of the dull roll placed opposite the patterned roll. This is to reduce the difference in the amount of plastic deformation between the upper and lower surfaces. C warping cannot be prevented simply by increasing the roughness of the roll placed opposite to the patterned roll when the roughness of the patterned roll is 100 to 200 JL and the maximum processable roughness of the dull roll placed opposite the patterned roll. This is because the rolling reduction ratio is large compared to , and in order to compensate for this, it is necessary to reduce the rolling reduction ratio.

The roughness of the dull roll placed opposite to the patterned roll is 0.
．． 5~IOB is desirable, less than 0.51L is C
There is no warping prevention effect, and if it exceeds 1 OIL, a uniform dull surface cannot be obtained, and the reduction ratio is preferably 2 to 15%. If it is less than 2%, the uneven pattern becomes blurred and the product value decreases, and if it exceeds 15%, the uneven pattern collapses and the product value decreases.

As a method for preventing warping of the metal strip, it is also possible to use patterned rolls for both the upper and lower rolls. In this case, C
Although this method is effective in preventing warping, the metal strip during rolling may be bent in the rolling direction, making the product unusable.

Figure 1 shows the embossed pattern, the roughness of the dull roll placed opposite the patterned roll, the rolling reduction rate during embossing rolling, and the C
FIG. 3 is a diagram showing the relationship between occurrence of warpage. In Figure 1,
Emboss rate,
That is, the area ratio of the four parts of the patterned roll was used. What is the reduction ratio during embossing rolling in the shaded area in Figure 1? C when ,
It shows the area where warpage occurs.

[Example] Using a four-layer reversible rolling mill shown in Fig. 2, stainless steel (
As a result of embossing SUS304), Table 1 was obtained.

In Fig. 2, l is a copper strip, 2 is a work roll, and 2
A is a patterned roll, 2B is a dull roll, 3 is a reinforcing roll, 4 is a deflector roll, and 5 is a winding and unwinding reel. Embossing was performed during the finishing pass during cold rolling.

In the example of the invention, the roughness of the dull roll on the opposite side to the patterned roll and the rolling reduction ratio of the finishing pass are changed depending on the embossed pattern (embossed ratio). In the comparative example, the roughness of the dull roll is not appropriate for the embossing ratio and rolling reduction ratio. Comparative example ■ is an example in which the patterned roll is also used for the roll facing the patterned roll. However, although C warping during rolling can be prevented, bending occurs in the rolling direction, making it impossible to put it to practical use.

FIG. 3 is a schematic diagram showing the emboss pattern and emboss rate in the embossing process. The shaded area in FIG. 3 indicates the area where the roll surface of the patterned roll is concave and the copper strip after rolling is convex.

[Effects of the Invention] As described above, the present invention provides a method for manufacturing an embossed metal strip in which a metal strip is rolled by an embossed patterned roll and an embossed pattern is imparted to the metal strip. A dull roll with a roughness corresponding to the embossed pattern is used as a roll that rolls the metal strip together with the patterned roll, and the rolling reduction ratio of the patterned roll and the dull roll is adjusted according to the embossed pattern. .

Therefore, embossing can be performed without causing C warpage during rolling, and the yield of the product can be significantly improved.

Furthermore, it becomes possible to manufacture even embossed patterns that cannot be manufactured using conventional techniques.

[Brief explanation of drawings]

Figure 1 shows the embossed pattern, dull roll roughness, reduction rate, and C.
Diagram showing the relationship between warpage occurrence, Fig. 2 is a schematic diagram showing a quadruple reversible rolling mill, Fig. 3 is a schematic diagram showing the embossed pattern and embossing rate, and Fig. 4 is a schematic diagram showing the state of C warping. It is. l...Steel strip, 2A...patterned roll, 2B...dull roll. Representative Patent Attorney Osamu Shiokawa Fig. 1 Emboss ratio (y=) Fig. 2 (aJ) (C) Eng) Boss rolling @ 3% (b) Fig. 4 → Rolling direction

Claims (1)

[Claims] (1) In a method for manufacturing an embossed metal strip in which a metal strip is rolled by an embossed patterned roll to give an embossed pattern to the metal strip, the metal strip is placed opposite to the patterned roll, and the metal strip is rolled together with the patterned roll. As the rolling roll, a dull roll with a roughness corresponding to the embossed pattern is used,
A method for manufacturing an embossed metal strip, characterized in that the rolling reduction ratio of a patterned roll and a dull roll is adjusted according to the embossed pattern.