JPH0663606A - Method for rolling metallic foil - Google Patents

Abstract

PURPOSE:To enable foil rolling using a foil material of which the sheet crown rate is adjusted in a specified range by hot and cold rollings. CONSTITUTION:The generation of wrinkles in a metallic foil coil 5 is dependent on the sheet crown rate of a metallic foil 4. The metallic foil 4 which is obtained by executing foil rolling of the foil material of which the sheet crown rate is adjusted at 0.1 to 0.7% is coiled into a coil shape. In this way, rolling by which wrinkles in the coil 5 of the metallic foil are hardly generated is executable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling metal foil such as aluminum foil.

[0002]

2. Description of the Related Art Metal foil such as aluminum foil is generally hot-rolled and cold-rolled into a foil having a thickness of 0.2 to 0.5 mm, and then a foil rolling machine. Manufactured by rolling to the target thickness. As shown in FIG.
The metal foil 4 rolled by the pair of upper and lower rolling rolls 1 and 1 of the foil rolling machine is then wound around the spool 2 by the winding device to form the aluminum foil coil 5. In FIG. 6, 3 is a deflector roll, and 5 is a metal foil coil wound around the spool 2.

Since the rolled metal foil 4 generally has a large plate crown ratio of 1.0 to 1.5%, when the metal foil 4 is wound around the spool 2 in a coil shape,
Regardless of the initial winding time, the metal foil coil 5 becomes a Tyco shape as the number of windings on the spool 2 increases.
Since the difference between the axial center and both ends of the coil 5 appears as a drum diameter due to the shape of the drum 5, the metal foil 4 located in the winding portion immediately before the coil 5 has a tyco shape. , A tension distribution as shown in FIG. 4 is generated. That is,
The coil 5 in which the metal foil 4 in the winding portion immediately before the Tyco-shaped metal foil coil 5 is a portion of the Tyco-shaped outer diameter that is the maximum
The tension (σf) becomes maximum at the central portion in the axial direction.

This will be described more specifically with reference to FIG.
FIG. 5 shows a case where a metal foil having a plate thickness of 0.13 mm, a plate width of 1500 mm, and a plate crown rate of 1% is wound with a tension of 4 kg / mm ² on the outlet side, and the metal foil is wound immediately before the metal foil coil. And the horizontal axis represents the distance (mm) from the widthwise center of the metal foil, and the vertical axis represents the tension (kg) at that portion.
f / mm ² ) is shown. As can be seen from this graph, the tension becomes 0 at the winding portions corresponding to both sides of the coil, increases gradually toward the central portion, and the tension becomes maximum at the central portion.

By the way, when rolling a metal foil (for example, an aluminum foil) at a high pressure reduction rate and a high speed, as shown in FIG.
As shown in FIG. 3, a local longitudinal wave 6 is generated on the metal foil 4 at the exit side of the rolling rolls 1 and 1 of the foil rolling machine. The main cause of the longitudinal waves 6 is the stress in the width (axial) direction generated in the roll contact arc, but it is also caused by the accuracy of the rolling mill, the rolling conditions, the cooling conditions of the rolling rolls, and the like. At this time, the metal foil having local longitudinal waves 6 as described above has no particular problem in quality as compared with the conventional one.

However, as a result of showing the tension distribution as shown in FIG. 5 as described above, a large tension is generated in the central portion depending on the coil shape, which promotes the longitudinal wave 6 and finally, as shown in FIG. If the longitudinal wave 6 buckles and becomes wrinkle 7, it becomes a problem in terms of quality and becomes a defective product. The present invention is
The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for rolling a metal foil that prevents wrinkles that occur when the rolled metal foil is wound into a coil.

[0007]

The present inventors have found that there is a correlation between the occurrence of wrinkles in a metal foil coil and the plate crown ratio of the rolled metal foil, and completed the present invention. That is, the method for rolling a metal foil of the present invention is characterized in that a foil material having a plate crown ratio adjusted to 0.1 to 0.7% by hot and cold rolling is foil-rolled.

Here, the plate crown ratio means a value represented by a percentage (%) of (hc-he) / hc in the cross section of the metal foil 10 shown in FIG. hc is the plate thickness at the center of the plate width, he is the plate thickness at the plate end, and most are determined in the hot rolling process.

[0009]

The function of wrinkling of the metal foil coil depends on the plate crown ratio of the metal foil. Therefore, the plate crown ratio of the foil is 0.
When the metal foil obtained by performing hot and cold rolling to 1 to 0.7% and then foil rolling to a target thickness is wound into a coil, wrinkles are generated in the metal foil coil. Suppressed.

[0010]

EXAMPLE A metal foil (for example, an aluminum foil) is generally hot-rolled and cold-rolled to form a foil having a plate thickness of 0.2 to 0.5 mm, and then a foil rolling machine is used to reach a target thickness. Manufactured by rolling. The present invention uses the above-mentioned conventionally known foil rolling machine, and the plate crown ratio of the metal foil 4 is 0.1 to 0.
The foil is adjusted to 7%, and the metal foil is rolled into a predetermined thickness and wound up.

Hereinafter, the reasons for limiting the numerical values will be described together with specific examples. [Specific Example] An aluminum foil having a plate thickness of 0.3 mm with a plate crown ratio adjusted to 0 to 1.5% was prepared by hot rolling and cold rolling, and this aluminum foil was produced in one step. And foil-rolling under the same rolling conditions, with a plate thickness of 0.13 mm and a plate width of 1500
mm aluminum foil was prepared and wound on a spool to produce an aluminum foil coil.

Table 1 shows the results of longitudinal wave generation and wrinkle generation of the obtained metal foil coil for each plate crown ratio of the aluminum foil.

[0013]

[Table 1]

As can be seen from Table 1, the generation of longitudinal waves increases as the plate crown ratio of the foil material increases. But,
When the plate crown ratio is 0.1 to 0.7%, the wrinkle of the aluminum foil coil is suppressed and the plate crown ratio is 0.8.
If it is more than%, the frequency of wrinkles is high. However,
Longitudinal waves occur from the beginning of rolling, but wrinkles occur after more than half of the aluminum foil is wound into a coil.

From the above results, it is possible to suppress the occurrence of wrinkles in the aluminum foil coil by reducing the plate crown ratio, and the occurrence of wrinkles in the aluminum foil coil increases when the plate crown ratio exceeds 0.7%. On the other hand, the plate crown ratio is 0.1
If less than%, wrinkles do not occur in the aluminum foil coil, but the aluminum foil 11 has a cross-sectional shape as shown in FIG.
The shape becomes defective.

Therefore, the plate crown rate is 0.1 to 0.7%.
By winding a metal foil obtained by foil-rolling the above-mentioned foil, a metal foil coil having no shape defect and almost no wrinkles can be produced. As a method of adjusting the plate crown ratio of the foil material within the above range, various conventionally known plate crown control methods such as roll crown adjustment, roll bending force adjustment, and roll order control are applied. .

[0017]

Industrial Applicability The present invention is obtained by adjusting the plate crown ratio of the foil material to 0.1 to 0.7% by hot and cold rolling and rolling the foil material to a target thickness. Since the obtained metal foil is wound in a coil shape, even if a longitudinal wave is generated in the metal foil, the longitudinal wave hardly buckles and wrinkles in the metal foil coil. Therefore, according to the rolling method of the present invention, it is possible to reduce the defective product generation rate of the metal foil coil more than ever before.

[Brief description of drawings]

FIG. 1 is a schematic view showing a crown shape of a rolled metal foil.

FIG. 2 is a schematic diagram showing a cross-sectional shape of a metal foil when the plate crown rate is small.

FIG. 3 is a diagram for explaining a problem of a metal foil coil.

FIG. 4 is a diagram for explaining a problem of a metal foil coil.

5 is a graph showing the tension distribution of FIG.

FIG. 6 is a drawing for explaining the manufacturing method of the metal foil coil.

[Explanation of symbols] 10 metal foil 11 metal foil

Claims (1)

[Claims] 1. A method of rolling a metal foil, which comprises foil-rolling a foil material having a sheet crown ratio adjusted to 0.1 to 0.7% by hot and cold rolling.