JPS58159901A - Production of deformed section bar - Google Patents

Abstract

PURPOSE:To produce deformed section bars having no twists by rolling blank materials with grooved rolls so as to roll down the parts to be thin-walled but not to roll down the parts to be thick-walled. CONSTITUTION:A bar 1 having a flat plate-like section molding which is a blank material is moved longitudinally between a grooved rolls 3 having a groove 2 provided on at least one surface side thereof and a roll 4 provided on the opposite side. While the thin-walled part 5 to be thin-walled in the transverse direction of the bar 1 is rolled down between a projecting surface part 6 of the roll 3 which delineates the part 2 and the roll 4, the bar receives no rolling down effect in the thick-walled part 7 to be thick-walled in the transverse direction located in the position corresponding to the groove 2. Thus, the flow by the deformation of the part 5 moves to the part 7 which is not applied with the rolling down force, that is, into the part 2, thereby packing the part 2. The generation of the difference in the longitudinal or rolling direction occuring in the difference in the wall thickness in the transverse direction is thus prevented, and the generation of twists after the rolling is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a strip of irregular cross section, which has portions with varying plate thicknesses in the width direction that are continuous in the longitudinal direction, by a rolling method.

When manufacturing strips that have continuous thickness changes in the width direction using the rolling method, the conventional method has been to roll strips with the same thickness by partially changing the reduction ratio. Therefore, the amount of deformation differs for each part in the width direction depending on the magnitude of the rolling reduction ratio to the strip, and this difference in the amount of deformation occurs as a difference in the elongation of the strip in the rolling direction, causing twisting in the rolled strip. It had become.

As a method for preventing twisting of the rolled strip, a transverse rolling method and an width rolling method have been used in which the strip is rolled so that the amount of deformation during rolling is released in the width direction of the strip.

However, when using the horizontal rolling method, workability is extremely poor because rolling is performed in the width direction perpendicular to the longitudinal direction of the strip.
On the other hand, when using the width rolling method, the forming process is performed intermittently because it uses a combination of a V-shaped die and a roll to suppress the process and deform it in the width direction of the strip. Moreover, since the method generates pressing force by the reciprocating motion of the rolls, the processing speed cannot be increased and production efficiency cannot be improved.

In addition to the rolling method, there is a method of forming the desired thickness change by cutting, but this method naturally produces unnecessary cutting waste, which has the fundamental drawback of high material loss. It has the following.

Therefore, an object of the present invention is to provide a rolling method that can eliminate the drawbacks of the prior art as described above, can produce strips with partially changed thickness in the width direction without twisting, and can realize excellent productivity. The purpose of this invention is to provide a manufacturing method according to the invention.

The gist of the present invention is to apply a rolling blade using a grooved roll to the part of a flat plate that is to be processed into a thin plate, and to apply the deformation flow of the material that occurs to the unrolled part of the groove of the grooved roll. The purpose is to absorb the residual internal stress and prevent the occurrence of torsion, and to re-roll the above-mentioned rolled material as a raw material with a grooved roll at the same reduction rate regardless of changes in plate thickness.

The method of the present invention can be applied to metal strips made of a wide variety of materials, such as copper, copper alloys, aluminum, aluminum alloys, iron, stainless steel, and composite materials thereof.

Embodiments according to the present invention will be described below with reference to the drawings.

As shown step by step in FIGS. 1(a) to 1(c), the method according to the embodiment of the present invention is to provide a strip 1 having a flat plate-like cross-sectional shape as a material on at least one side thereof. It runs in the longitudinal direction between a grooved roll 6 having a groove 2 and a roll 4 provided on the opposite side (see Fig. 1(a)).
)reference). At that time, the thin-walled portion 5 of the strip 1 to be thinned in the width direction is rolled down between the roll 4 and the protruding surface portion 6 defining the groove 2 of the grooved roll 6,
Because the reduction action is not performed on the thick-walled portion 7 that is to be thick-walled in the width direction and is located at a position corresponding to the groove portion 2,
The flow caused by the deformation of the thin-walled portion 5 moves into the thick-walled portion 7 to which the reduction blade is not applied, that is, into the groove 2 (see FIG. 1(b)), and generally fills the groove 2 ( 1st
6 (C)) prevents differences in elongation in the longitudinal direction or in the rolling direction due to differences in wall thickness in the width direction, thereby ensuring that twisting occurs after rolling of the strip 1. can be resolved.

Furthermore, in order to reliably form the thickness change shape of the strip 1 with a predetermined cross-sectional shape, the strip 1 that has been rolled as described above is used as a raw material, and if necessary, hardness adjustment, uniform processing, etc. are carried out. After performing annealing, etc., the processed strip 1 is rolled uniformly in the longitudinal direction or rolling direction by a grooved roll (not shown) formed so that it can be rolled at the same rolling rate in accordance with the wall thickness ratio of the processed strip 1 described above. It can be manufactured by re-rolling to achieve a certain elongation.

Here, the number of passes of the rolling pool is appropriately selected depending on the thickness, length in the width direction, and material of the flat plate serving as the raw material, or the desired size of the difference in thickness in the width direction. Moreover, when performing the above-mentioned two rollings, productivity can be further improved by performing both rollings on the same line, if intermediate treatment such as annealing between the two rollings is not required.

On the other hand, in the above explanation and illustration, one thick-walled part 5 is formed at the center of one side of the strip 1, but grooved rolls are arranged on both sides of the strip, and the second
As shown in Figure (a), the thickness of the strip is manufactured so that both sides of the processed portion protrude, or the number of grooves or protruding surfaces of the grooved roll and the position in the width direction of the strip are appropriately changed. As a result, strips having various cross-sectional shapes in the width direction, such as those shown in FIGS. 2(b) to 2(d), differing in the number and position of the thick-walled portions 5 can be manufactured as desired.

In addition, as shown in FIG. 6(a), by creating several rows of identical stripes for the thick-walled portions and cutting off the unnecessary thick-walled portions with a strip, as shown in FIG. 6(b)-( As shown in d), it is also possible to manufacture strips having various thickness changes in the width direction.

As described above, according to the present invention, the rolling deformation of the thin-walled portion is reduced by rolling down the thin-walled portion using a grooved roll and rolling so as not to essentially roll down the thick-walled portion. is absorbed into the thick-walled part located in the d] direction, thereby preventing deformation and elongation in the longitudinal direction of the strip or in the rolling direction.

In addition, by re-rolling the rolled strip at the same rolling rate in accordance with the thickness ratio in the width direction, it is possible to elongate the strip evenly in the longitudinal direction or in the rolling direction, and more accurately achieve the desired width direction. It is possible to manufacture strips with varying thicknesses, and in addition, it enables rolling with a large deformation flow in the width direction of the strips, improving rolling efficiency and reducing the number of work hours. This is a very effective method.

[Brief explanation of drawings]

FIGS. 1(a) to (Q) are diagrams showing step by step the rolling process according to an embodiment of the present invention, and FIGS. 2(a) to (d) are diagrams showing a strip with irregular cross section manufactured by the method of the present invention. FIGS. 6(a) to 6(d) are further cross-sectional views showing an example of application of the method of the present invention. 1: Strip, 6: Grooved roll, 5: Thin-walled part, 7: Thick-walled part.

Claims (1)

[Scope of Claims] 1. A method for producing a strip of irregular cross section having portions with different thicknesses in the width direction continuously in the longitudinal direction, the method comprising rolling the strip with a work roll, at least one of which is a grooved roll. A rolling blade is applied only to the part where the plate thickness in the width direction is to be reduced, and the amount of deformation of the material in the part of the strip where the rolling blade is applied is calculated as the rolling reduction of the strip located in the groove of the grooved roll. A method characterized in that a non-twisted irregular cross-section strip is manufactured by absorbing it into the untwisted portion to eliminate the difference in the amount of deformation in the width direction of the strip. 2. A method of manufacturing a strip of irregular cross-section that has parts with different thicknesses in the width direction continuously in the longitudinal direction by a rolling method, in which the thickness of the strip in the width direction is changed by using a work roll, at least one of which is a grooved roll. A rolling blade is applied only to the part to be thinned, and the amount of deformation of the material in the part of the strip to which the rolling blade is applied is absorbed by the unrolled part of the strip located in the groove of the grooved roll. and re-rolling the rolled strip at a rolling rate according to the thickness ratio in the width direction to uniformly elongate the strip in the longitudinal direction and in the rolling direction.