JPS60244402A - Production of extra-thin broad material - Google Patents

Abstract

PURPOSE:To prevent edge cracking of a narrow material and to facilitate production of an extra-thin broad material by forming at least a sheet of metallic strips to the width smaller than the width of the other metallic strips, superposing such strips and rolling the same. CONSTITUTION:One of the strips is formed to 650mm. width and the superposed strips are rolled at 50% draft in equal-thickness lap rolling with 50mum/50mum thickness X 700mm. width. The material having 650mm. width is entirely free from edge cracking and the satisfactory sheet having an equal thickness of 25mum and different widths is obtd. The material having 180mum thickness is made 740mm. wide and the material having 60mum thickness is made 700mm. wide in press welding of the materials having different thicknesses, i.e., 180mum/60mum. Such materials are subjected to rolling at 50% draft in the first pass, by which the coils having 90mum and 30mum as well as 30mum thicknesses are obtd. The materials are further subjected to the 2nd pass of rolling in the opposite direction at 40% draft. The broad materials having 54mum thickness and 18mum thickness are thus produced without generating small pieces of sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing ultra-thin and wide materials using a lap rolling method in which a plurality of metal strips are stacked and rolled simultaneously.

(b) Prior Art The lap rolling method, in which a plurality of metal strips are stacked and rolled, has been known for a long time. However, the conventional lap rolling method is related to a method for producing a cladding material in which dissimilar metals are closely laminated or a method for producing aluminum foil, and is not for producing thin plates of the same kind of metal.

In recent years, a method for producing thin copper strips has been proposed in which a plurality of copper strips are stacked one on top of the other, cold-rolled, and then each descendant copper strip is peeled off (for example, Japanese Patent Laid-Open No. 58-215206).

In particular, in the production of ultra-thin plates, there is a minimum thickness that can be rolled due to the elastic deformation of the rolls, so if a product smaller than that thickness is to be obtained, this lap rolling method must be used. In particular, it has been widely industrialized in the rolling of aluminum foil and the production of cladding materials, and can also be applied to the field of copper strips. However, when the plate thickness is less than 100 μm, edge cracks will occur at the edges on the width side of the plate during rolling, and if the degree of cracking becomes severe, it will cause a plate breakage accident, which will significantly reduce the production efficiency of thin material rolling. This makes it impossible to industrially produce ultra-thin, wide-width materials.

In the lap rolling method, it is common sense to roll a plurality of strips with the same width. For this reason, when the material becomes thinner, the edges tend to shift toward the ears.

←J Problems to be Solved by the Invention The problems to be solved by the present invention are to eliminate cracks at the edges of metal strips and to manufacture ultra-thin and wide materials with a thickness of 30 Am or less at high speed. .

B) Means for Solving the Problems The method for manufacturing ultra-thin wide material of the present invention is based on a lap rolling method in which a plurality of metal strips are stacked and rolled at the same time.
The above-mentioned problems are solved by selecting the width of one metal strip to be smaller than the width of the other metal strips and then peeling off the rolled metal strips.

In particular, when selecting the plate width, it is preferable that the width of the thinner metal strip be smaller than the width of the thicker metal strip.

In addition, in order to perform multiple passes of rolling while stacked, from the perspective of preventing seizing on the mating surfaces, either apply oil to the mating surfaces of material A and B on the entry side in Figure 1, or separate them separately when creating the stacked coil. It is desirable to apply a molding agent beforehand.

Furthermore, when producing ultra-thin and wide materials, three sheets are rolled one on top of the other, thick materials are placed on the top and bottom surfaces, and thin materials are placed in the center, and the width of the thin materials is made smaller than that of the thick materials. is preferred.

As for the difference in plate width ΔW, it is basically more desirable that it is smaller, but it seems appropriate to be 10 to 60, taking into account lateral plate deviation during rolling. E P on the inlet and outlet reels
If a C (Edye Po'5ition Control) device is attached, it is possible to reduce this ΔW to 10 mm or less.

(e)) Examples The following description will be made using a copper strip as an example, but the present invention is not limited to copper strips and can be applied to other metal strips as well. The rolling mill used was a work roll with a diameter of 350 mm, and a diameter of 1'38.
It is a 4-layer lever mill with 0mm bank-up rolls. As shown in Figure 1, there are two
Two reels 2.3 and one reel 4 are provided on the exit side.

α, Single-sheet rolling of wide material (comparative example) Conventionally, it has been easy to manufacture products up to 50 μm thick, but we attempted to create products even thinner than this. However, 30μ
If the thickness is less than about 1.5 m, plate breakage at the start of rolling, poor shape, and breakage due to pin holes occur frequently, and it is only possible to roll a thickness of up to 30 μm at an extremely low speed, and there is no hope for industrialization.

b1 Equal thickness lap rolling (Part 1) 2 coils (A,
As shown in FIG. 1, B) was rolled over two reels 2.3 on the entry side of the rolling mill 1 for one pass rolling at a reduction rate of 50%.

We succeeded in manufacturing an ultra-thin wide material with a thickness of 25 μm and a width of 700 mm. However, as shown in Figure 2, the sheet deviation in the sheet width direction δ
As a result, cracks occurred at the edges, making it impossible to increase the tension. The maximum rolling speed is 100,100 rn7, which results in low production efficiency and a rise in manufacturing costs. Even if the overlapping surfaces of materials A and B in FIG. 1 were not particularly lubricated, no seizure occurred and separation was possible without any problems with just rolling oil during rolling to a thickness of 50 μm.

C0 Equal Thickness Lap Rolling (Part 2) Lap coils were prepared in advance from two coils of 50 μm thick and 700 mm wide on a separate line, and rolled on the entry reel at a reduction rate of 50%. 25μm thickness
We succeeded in manufacturing an ultra-thin wide material with a width of 700+++m. However, as shown in Figure 2, due to the sheet deviation δ in the sheet width direction,
Ear cracks occurred at the edges, making it impossible to increase the tension. The maximum rolling speed is 13 Q m/min, which results in low production efficiency and a rise in manufacturing costs. Note that the plate deviation δ was smaller than in method b, and the speed could be increased slightly.

In both methods b and c, trimming of both edges is inevitable. Furthermore, after one pass of rolling using method 5c, a second pass of rolling in the opposite direction was attempted, but plate breakage occurred frequently and production was impossible.

d. Lap rolling of different thicknesses 5 Since the method of c could only roll the material up to a thickness of 25 μm, lap rolling of different thicknesses was performed. 180μm thickness/70
A stacked coil was created by combining 0 rolling width and 60 μm thick x 700 rolling width coils on a separate line, and rolling was performed at a first pass reduction rate of 50%. Since coils with a thickness of 90 μm and a thickness of 30 μm were obtained, rolling was attempted at a rolling reduction of 50% in the opposite direction of the second pane, but as with method C, many plate breakages occurred and the rolling was discontinued. However, since there was no particular problem with the rolling speed of 200 ml 1 m 1 n for pass (2), it was confirmed that the larger the overall thickness, the higher the speed could be achieved.

e.) Effect of limmer installation In all of the above cases, edge cracking due to sheet slippage was the main cause of sheet breakage, so a simple trimmer was installed on the entry side of the rolling mill, and the strip was rolled while aligning the sheet width with the trimmer.

As a result, we confirmed that edge cracking was significantly reduced and that it was possible to roll at higher speeds than before and to achieve ultra-thinness. Due to the reduction in work space due to the installation of a trimmer, the problem of disposing of trimming waste, the occurrence of roll defects due to board sagging due to trimming errors, and the need to re-trim the finished product in some cases, the following differences will occur. Width rolling was attempted.

f0 Equal Thickness Different Width Rolling (Part 1) Method C 50 ttrn150 ttm thickness x 700
In overlapping rolling of mi width, rolling was performed with one sheet width set to 650 mm.

No edge cracking occurred in the 650 width material, and a very good board was obtained. Note that the 700 mm width material was not much different from the conventional material.

1. Different thickness and different width rolling (part 2) In the method of d, in the 180 μm / 60 μm thickness lap rolling, 180 μm thickness was set to 740 width, 60 μm thickness was set to 700 width, and rolling was performed at a pass reduction rate of 50%. Ta. Since the width of the thicker material is wider, the occurrence of edge cracks observed in method d in the 30 μm thick material after rolling is extremely small (Fig. 3).
High-tension high-speed rolling (400 m/m11z or higher) is now possible.

Furthermore, a second pass of rolling was performed in the opposite direction at a rolling reduction ratio of 40%. As a result, 54cm
Wide width materials with a thickness of μm and a thickness of 18 μm could be manufactured. For reference, the actual measured plate thickness distribution at the lth ξth is shown in Fig. 4. As is clear from FIG. 4, an extremely thin plate with good flatness and a uniform thickness distribution in the width direction was obtained.

(f) Effects According to the method of the present invention, it is possible to prevent edge cracking of narrow width materials, so if the thinner side is made narrower when stacking materials of different thickness, it is possible to prevent edge cracking of narrow width materials. Manufacturing becomes easier.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a normal lap rolling method. FIG. 2 is a plan view showing edge cracks in a rolled material rolled by a conventional method. FIG. 3 is a plan view showing an embodiment of the present invention. FIG. 4 is a graph showing the plate thickness distribution of an example of the present invention. 1: Rolling mill 2: Reel 3: Reel 4 reels (5 other people)

Claims (2)

[Claims] (1) In the lap rolling method in which multiple metal strips are stacked and rolled at the same time, the width of at least one metal strip is selected to be smaller than the width of the other metal strips, and rolling is performed. A method for producing ultra-thin wide material comprising peeling off rolled metal strips respectively. (2) The method according to claim 11, characterized in that the width of the thinner metal strip is selected to be smaller than the width of the thicker metal strip.