JPS63268502A - Manufacture of extra thin metal strip - Google Patents

Abstract

PURPOSE:To improve the shape quality of products by installing a wrinkle straightening roll dividing a length of a metal strip into specified lengths in a region where a lateral sectional shape of the extra thin metal strip changes from a flat situation to a next flat situation. CONSTITUTION:A wrinkle straightening roll 6 is installed to divide a length of a metal strip S into lengths of <=1/2 length of the strip S in a region, where a sectional shape of the strip S changes from a flat situation to a next flat situation, between a supplying reel 1 of the strip S and a 1st deflector roll 2. The roll 6 cooperates with a high tension of a rolled stock and prevents accumulation of differences in length generated by the tension in the region because the strip S is previously given the high tension. Thus, generation of stretch elongations of the extra thin metal strip S of <=0.3mm thickness is prevented to improve the shape quality of products.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is an ultra-thin metal strip that can be manufactured by rolling an ultra-thin metal strip with a thickness of 0.3 mm or less into a good shape without causing streak elongation. The present invention relates to a method for manufacturing a metal strip.

[Conventional technology]

In recent years, ultra-thin steel sheets have come to be used as composite materials with paper and plastic, as well as for lead frame materials for IC circuits, due to their excellent magnetic sensitivity and electromagnetic shielding properties. To.

There is an increasing demand for ultra-thin metal strips with a thickness of 0.3 mm or less. When attempting to manufacture such an ultra-thin metal strip by rolling, the edges of the rolled metal strip may come off due to the flattening phenomenon at the rolling position of the rolling rolls due to the thin thickness of the rolled metal strip. The rolling rolls come into contact with each other at certain positions, making it difficult to apply a uniform rolling load to the metal strip across the entire width, and at the same time, variations in the thickness of the metal strip tend to occur in the width direction. This phenomenon can be considerably improved by using small-diameter hard rolls and by adjusting the rolling blades attached to the rolls so as to adjust the degree of curvature of the rolls. It is impossible to completely eliminate variation.

[Problem that the invention seeks to solve]

As a result, when attempting to manufacture an ultra-thin metal strip by rolling, the cross-sectional shape in the width direction changes from a state where it is considered to be almost flat during the rolling process to a state where the cross-sectional shape in the width direction is considered to be almost flat. A second metal strip is placed in the zone of
There is a problem in that streaks elongate in the length direction as shown in the figure, and when the tension applied to the metal strip is reduced in an attempt to prevent the streaks from elongating, herringbones as shown in FIG. 3 occur.

[Means for solving problems]

As a result of various studies to solve the problems of the prior art described above, the present inventors found that it is impossible to avoid the occurrence of herringbones by reducing the tension applied to the metal band. However, if the metal strip is rolled with high tension applied to it, streaks will be elongated in the length direction of the metal strip as mentioned above. As a result of further investigation into how to prevent the elongation of streaks that occur in the length direction, we found that this elongation of streaks occurs when the cross-sectional shape of the metal strip in the width direction is considered to be approximately flat, In the zone where the cross-sectional shape in the direction is considered to be almost flat, the tension applied to the metal strip due to the variation in the thickness in the width direction of the metal strip causes a difference in length within that zone. We investigated that the difference in length is caused by the accumulation of differences in length, and in order to prevent the accumulation of differences in the length direction of the metal strip, the cross-sectional shape in the width direction is considered to be almost flat, and then the cross-sectional shape in the width direction is almost flat. The width of the metal strip is at least at a position where the length of the metal strip in the zone is divided into 1/2 or less in the zone where streak elongation occurs, which is the zone before transitioning to a state that is considered flat. The present invention was completed by determining that it would be sufficient to install a wrinkle smoothing roll that has a substantially flat cross-sectional shape in the direction.

That is, in the present invention, high tension is applied and the plate thickness is 0.3 m.
When manufacturing ultra-thin metal strips of 1.5 m or less by rolling, the zone where the cross-sectional shape in the width direction transitions from a state where the cross-sectional shape in the width direction is considered to be almost flat to the next state where the cross-sectional shape in the width direction is considered to be almost flat. In the zone where streak elongation occurs, at least at a position where the length of the metal strip in the zone is divided into 1/2 or less length, a wrinkle smoothing roll is installed to make the cross-sectional shape of the metal strip in the width direction almost flat. The present invention relates to a method of manufacturing an ultra-thin metal strip with a good shape, which is characterized by the fact that it is installed.

EMBODIMENT OF THE INVENTION Hereinafter, the manufacturing method of the ultra-thin metal strip based on this invention is demonstrated based on the Example shown in drawing.

FIG. 1 is an explanatory diagram showing one embodiment of the method for manufacturing an ultra-thin metal strip according to the present invention.

In the figure, 1 is a rolled metal strip S with a plate thickness of 0.3 mm or less
2 is a first deflector roll that changes the moving direction of the metal strip S unwound from the unwind reel 1 with a high tension that prevents herringbone formation. It is. 3 is a rolling roll for rolling the metal strip S whose moving direction has been changed by the first deflector roll 2;
The rolling rolls may be those of a normal multi-high rolling mill such as a high-high rolling mill or a six-high rolling mill, or the rolling rolls of a cluster mill such as a Senshimia mill. This rolling roll 3
When the rolling mills are installed in tandem as in the illustrated embodiment, there are as many rolling mills as there are tandems. 4 is a second deflector roll for changing the moving direction of the metal strip S rolled by the rolling roll 3; 5 is a second deflector roll for winding the metal strip S whose moving direction has been changed into a coil by the second deflector roll 4; It is a take-up reel. 6 is a zone where the cross-sectional shape in the width direction transitions from a state where the cross-sectional shape in the width direction is considered to be almost flat to a state where the cross-sectional shape in the width direction is considered to be almost flat when manufacturing the metal strip S into an ultra-thin metal strip by rolling. In the zone where stripe elongation occurs, the metal strip S is installed at least at a position that divides the length of the metal strip S in the zone into 1/2 or less, and the cross-sectional shape of the metal strip S in the width direction is This is a wrinkle smoothing roll that makes it almost flat. The zones where this streak elongation occurs include the position where the metal strip S is wound on the unwinding reel 1, where the cross-sectional shape in the width direction is considered to be almost flat, and the position where the metal strip S is wound on the unwinding reel 1, and the position where the metal strip S is wound on the first deflector roll 2 position, the position of the rolling roll 3, the position of the second deflector roll 4, and the position where the take-up reel 5 takes up the winding. A zone from the first deflector roll 2 to the rolling roll 3, a zone from the rolling roll 3 to the second deflector roll 4, and a zone from the second deflector roll 4 to the take-up reel 5. In addition, when the rolling mills that roll the metal strip S are installed in tandem, the zone is from the rolling roll 3 of the rolling mill installed in tandem to the rolling roll 3 of the next rolling mill. There may be both cases.

In this way, in the method of the present invention, when manufacturing the metal strip S by rolling, the cross-sectional shape in the width direction changes from a state where the cross-sectional shape in the width direction is considered to be almost flat to a state where the cross-sectional shape in the width direction is considered to be almost flat. At least the metal band S in the zone where stripe elongation occurs is
A wrinkle smoothing roll 6 that makes the widthwise cross-sectional shape of the metal band S almost flat at the position where the length is divided into 172 or less lengths.
This is because if the wrinkle smoothing roll 6 is installed only at the front end or rear end of the metal strip S in that zone in the direction of movement, the thickness of the metal strip S in the width direction will vary. The difference in the length of the metal band S caused by the tension applied to the metal band S in that zone is undesirable because it accumulates within that zone and causes streak elongation. This is because if the difference in length in the direction is made as small as possible, the number of wrinkle smoothing rolls 6 to be installed can be reduced and equipment costs can be reduced.

〔Example〕

5O3304 with plate thickness of 0.2mm and plate width of 1030mm
Annealed material of 54 + am φ
Cold rolling was performed with and without using a wrinkle smoothing roll of 00a+m length to a plate thickness of 0.1mm.
An ultra-thin stainless steel plate was manufactured. Note that the fourth pass of rolling when the wrinkle smoothing roll is not used is the third pass of rolling.
After rolling was performed using a wrinkle smoothing roll up to the pass, the wrinkle smoothing roll was removed only in the final pass (fourth pass) and rolling was performed.

In the rolling process using this Senshimia mill, the length of the zone from the unwinding reel to the first deflector roll is about 1000 on, and the length of the zone from the first deflector roll to the rolling roll is about 2100 mm.

The length of the zone from the rolling roll to the second deflector roll is approximately 2100 m+++, and the length of the zone from the second deflector roll to the take-up reel is approximately 1000 mm. A wrinkle-smoothing roll was placed approximately in the center of each of these zones. The results are shown in Table 2.

Table 2 ○: Good rolled shape ×: Streak elongation occurred Note 1: Streak elongation occurred in the zone from the unwinding reel to the first deflector roll Note 2: Streak elongation occurred in the zone from the rolling roll to the second deflector roll [Operations and Effects] The method for manufacturing an ultra-thin metal strip according to the present invention as detailed above has the advantage that herringbones are generated during the rolling process.
When manufacturing ultra-thin metal strips with a thickness of 0.3 mm or less by applying high tension to prevent In the zone where streak elongation occurs, which is the zone before transitioning to a state considered to be flat, the metal strip is placed at least at a position where the length of the metal strip in the zone is divided into 1/2 or less. A wrinkle smoothing roll with a nearly flat cross-sectional shape in the width direction is installed, and the tension applied to the metal strip due to the variation in the thickness of the metal strip in the width direction causes differences in length within that zone. This is a method of manufacturing ultra-thin metal strips with a good shape by preventing the phenomenon that occurs due to the accumulation of differences in lever length. This can be carried out by a simple modification of the equipment by simply installing an appropriate number of wrinkle smoothing rolls that make the cross-sectional shape in the width direction of the metal strip almost flat at the positions where the length is divided into lengths of 172 or less. Since the number of strips is small, the cost of improving the equipment is low, and it is possible to supply wide, ultra-thin metal strips that require good formability, such as high-tech materials, and its commercial value is extremely high. There's something big about it.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the method for manufacturing an ultra-thin metal strip according to the present invention, FIG. 2 is a perspective view showing a state in which streaks are elongated in the length direction of the metal strip, and FIG. FIG. 2 is a perspective view showing a state in which herringbones are generated on a metal band. 1... Unwinding reel 2... First deflector roll 3... Rolling roll 4... Second deflector roll 5... Winding reel 6... Wrinkle smoothing Roll S...Metal band

Claims (1)

[Claims] 1. When manufacturing an ultra-thin metal strip with a thickness of 0.3 mm or less by applying high tension by rolling, the cross-sectional shape in the width direction is considered to be almost flat, then the cross-sectional shape in the width direction is In the zone where the cross-sectional shape is considered to be almost flat and where streak elongation occurs, at least at a position where the length of the metal strip in the zone is divided into 1/2 or less. A method for manufacturing an ultra-thin metal strip with a good shape, which comprises installing a wrinkle smoothing roll that makes the cross-sectional shape of the metal strip substantially flat in the width direction. 2. The method for manufacturing an ultra-thin metal strip according to claim 1, wherein the zone where the wrinkle smoothing roll is installed is the zone from the unwinding reel to the first deflector roll. 3. The method for producing an ultra-thin metal strip according to claim 1, wherein the zone where the wrinkle smoothing roll is installed is the zone from the first deflector roll to the rolling roll. 4. The method for manufacturing an ultra-thin metal strip according to claim 1, wherein the zone where the wrinkle smoothing roll is installed is the zone from the rolling roll to the second deflector roll. 5. The method for manufacturing an ultra-thin metal strip according to claim 1, wherein the zone where the wrinkle smoothing roll is installed is the zone from the second deflector roll to the take-up reel. 6. A claim in which rolling mills for rolling ultra-thin metal strips are installed in tandem, and the zone where the wrinkle smoothing rolls are installed is a zone from rolling roll to rolling roll of the rolling mills installed in tandem. The method for producing an ultra-thin metal strip according to item 1.