JPH03258404A - Width expanding method of metallic sheet - Google Patents

Abstract

PURPOSE:To efficiently obtain the product with extensive width dimension by performing by shifting the wave expanding work of metallic sheet which is corrugating formed in the width direction gradually from the middle part in the width direction to end parts. CONSTITUTION:A metallic sheet or strip metal is formed into the state with waves in the width direction. Next, the corrugated metallic sheet or strip metal is subjected to the wave expanding work by shifting gradually from the middle part in the width direction to the end parts. The corrugated sheet is made with the rolling mill with a rolls with calibers. The corrugated sheet is expanded using a die. In this way, the metal plate with adequate expanding quantity can be obtained at practical cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of widening a long metal plate.

(Prior Art) Conventionally, as a means for widening a long metal plate, as disclosed in Japanese Patent Publication No. 50-1463, a single roll having sinusoidal irregularities in the roll axis direction is used to expand the width of a metal plate. A known method is to form a sheet material into a sheet material having corrugations in the width direction as shown in FIG. 5, and then roll the corrugated sheet material using flat rolls as shown in FIG.

On the other hand, as disclosed in Japanese Patent Application Laid-open No. 83-1118404, a long flat metal plate is oriented from the center in the width direction to the ends symmetrically with respect to the center in the width direction of the plate, as shown in FIG. A known method is to widen a plate material by forging it using a pair of upper and lower molds that run obliquely in the flow direction.

In the case of these conventional techniques, for example,
When using the technology disclosed in Publication No. 463, No. 5
When a corrugated sheet material as shown in the figure is rolled to spread out the corrugations with a flat roll, each convex part of the corrugated sheet material and the outer circumferential surface of the flat roll come into contact simultaneously in the entire width direction of the sheet, as shown in Fig. 8. Therefore, displacement in the width direction is restrained in the entire contact area of the corrugated plate material. As a result, a sufficient amount of widening cannot be obtained with one bus.

Therefore, in order to obtain the desired widening amount, multiple passes of rolling are required, resulting in a problem of low productivity. On the other hand, according to the technique disclosed in JP-A-63-188404, a flat metal plate is widened by reduction forging using upper and lower dies that run diagonally in the width direction. For some reason, there is a problem in that a large load is required, resulting in large-scale equipment and high costs.

(Problems to be Solved by the Invention) An object of the present invention is to solve the problems in the above-mentioned prior art and to provide a means for widening a metal plate material with high productivity, low cost, and high efficiency.

(Means for Solving the Problems) In order to achieve the above object, the gist of the present invention is as follows:
A metal plate or metal band is formed into a state in which it has waves in its width direction, and then the corrugated metal plate or metal band is subjected to a wave-stretching process that is gradually shifted from the center part to the six ends in the width direction. The method of widening the width of a metal plate is characterized by the following.

The present invention will be explained in detail below.

In the present invention, a corrugated plate having sinusoidal waves in the width direction of a long metal plate is manufactured using a rolling mill equipped with rolls having grooves.

After that, for example, using a forging machine having a die having the shape shown in FIG. so that it can be carried out without being constrained by displacement.

That is, first, the wave expansion process of the corrugated plate is performed at the part marked ■ of the die shown in Fig. 1, and then the wave expansion process is performed at the part marked ■, and then at the part marked ■. .

By the way, if you try to spread out the waves of a corrugated board using a flat die, each part of the corrugated board will spread out over the entire width of the board, similar to when rolling the waves by using a flat roll shown in Figure 8. The convex portion and the die come into contact at the same time, and the rolling blade (black arrow shown in FIG. 9) applied to each contact point increases toward the center in the width direction of the sheet. This means that at a contact point closer to the end in the sheet width direction, the resultant force of the sheet width direction component of the force acting on the sheet material from the die is applied to the central portion in the sheet width direction as a compressive force. In addition, the force that prevents the width of the plate material from expanding, as shown by the white arrow in Figure 9, is the sum of the force applied as a compressive force to the central part in the width direction of the plate and the friction coefficient of the rolling blade applied to each contact point. It is. Therefore,
When rolling by expanding the waves using flat rolls as disclosed in Japanese Patent No. 463, the restraining force in the board width direction becomes large, and the width widening effect on the board becomes small.

According to the present invention, as shown in FIGS. 2(1), (2), and (3), the corrugation expansion process of the corrugated plate is performed in divisions over time in the width direction of the plate. Therefore, the number of contact points that are simultaneously constrained in the width direction of the plate can be significantly reduced, and the restraining force in the width direction of the plate does not become large.
It is possible to increase the width of the plate material.

Further, according to the present invention, since there is no need to reduce the plate material, the forging load can be significantly reduced compared to the prior art disclosed in Japanese Patent Application Laid-open No. 188404/1983. When carrying out the present invention, the shape of the die used is not limited to that shown in FIG. For example, a die having the shape shown in FIG. 3 may be used.

On the other hand, when forming a plate material into a corrugated plate, any forging machine equipped with a type die having an uneven shape such as a sinusoidal curve may be used.

Furthermore, when expanding the waves on a corrugated board,
Processing is carried out gradually from the center in the width direction of the board to the edges.
It is also possible to take into account the shape of the rolls and use arranged rolling mill rows. Further, in order to improve the surface quality of the plate material after widening, the plate material may be rolled with slight reduction.

Furthermore, the gap between the dies or rolls can be adjusted in order to adjust the amount of width expansion for the plate material.

(Example) A plate with a width of 1000 mm was rolled with corrugations using a rolling mill with grooved rolls as shown in Fig. 4, and the corrugations were made with a plate thickness of 5 mm, a wave height of near 0 mm, and a wave pitch of 250 m+s. It was made into a board.

Next, this corrugated plate was processed by using a forging machine having upper and lower dies having the shape shown in FIG. 1 to expand the corrugations of the corrugated plate gradually from the central part in the widthwise direction of the plate to the ends. As a result, it was possible to obtain a plate material whose width was increased by 20%.

(Effects of the Invention) According to the present invention, a plate material with a sufficient width expansion can be obtained at a practical cost.

Further, by combining the present invention with a continuous casting process in which it is difficult to change the sheet width, products with a wide range of sheet widths can be efficiently obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the die shape used when carrying out the present invention, and FIG. 2 is a diagram showing an example of the shape of a die used in carrying out the present invention. FIG. FIG. 3 is a diagram showing another example of the die shape used in carrying out the present invention. FIG. 4 is an embodiment of the present invention in which corrugation is applied to a plate material. FIG. 5 is a diagram showing a longitudinal section of a corrugated board, FIG. 6 is a diagram showing a conventional technique for applying corrugated widening to a corrugated board, and FIG. 7 is a diagram showing a method for expanding the width of a board. Figure 8 is a diagram showing how force is applied in the conventional technique of applying corrugated expansion processing to a corrugated plate, and Figure 9 is a diagram showing an example of a conventional technique for applying corrugation to a corrugated plate. It is an explanatory view showing how force is applied when it is assumed that the plate is subjected to wave expansion processing.

Claims (1)

[Claims] A metal plate or metal band is formed into a state in which it has waves in its width direction, and then the corrugated metal plate or metal band is subjected to a wave-stretching process that is gradually shifted from the center portion in the width direction to the end portions. A method for expanding the width of a metal plate.