JPS58163501A - Production of deformed section bar - Google Patents

Abstract

PURPOSE:To obtain a deformed section bar having the part where the thickness differs in the transverse direction without generation of any twist or the like by rolling down a flat blank plate with a grooved roll to buckle and deform the unrolled part to be walled thickly and rolling this part. CONSTITUTION:A blank bar 4a which is a flat plate molding is passed between a grooved roll 2 having a groove part 1 in the part for working the material thickly and a flat roll 3 to apply rolling down force only on the part 5 to be walled thinly. The groove part 1 of a thick walled part 6 in an unrolled state is buckled and deformed by the rolling down force. The rolled bar 4b having the part 6 in the buckled state is passed between flat rolls 7 and 7 to roll down only the part 6 again to a prescribed thickness, whereby a deformed section bar 4c is obtained. The snaking or twisting of the bar is prevented by this method, whereby the number of working stages is reduced and productivity is improved.

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a strip of irregular cross section that has portions with different thicknesses in the width direction that are continuous in the longitudinal direction. When manufacturing irregular cross-sectional strips with different thicknesses in the cross section by rolling, if a material with the same sheet thickness is rolled with a partially changed rolling reduction, the amount of rolling deformation from the material will be localized depending on the size of the rolling reduction. Therefore, this difference in the amount of deformation results in a difference in elongation of the rolled strip in the longitudinal direction, causing meandering or twisting of the rolled strip. As a method to solve this meandering or twisting, a horizontal rolling method or a center rolling method designed to release the amount of deformation in the width direction of the strip has been used. However, in the horizontal rolling method, since long strips are rolled in the transverse or width direction with respect to the longitudinal direction, the material must be fed intermittently, which causes deterioration of workability and impediment to productivity improvement. It became.゛Also, in the width rolling method, the thickness of the plate is deformed in the width direction by extrusion processing using a combination of a V-shaped die and rolls, but pressing force is generated by reciprocating the rolls. Therefore, processing and forming had to be carried out intermittently, and the processing speed could not be increased, so it was not possible to improve production efficiency. On the other hand, as a method that does not involve rolling, there is a method in which the material is formed into a predetermined thickness change by a cutting method, but in this method,
As a matter of course, this method has the fundamental drawback of producing an unnecessary cut layer and increasing material loss. Therefore, an object of the present invention is to provide an alternative to the prior art as described above.
This method eliminates the drawbacks of strips having different thicknesses in the width direction and makes it possible to manufacture irregular cross-section strips having different thicknesses continuously in the longitudinal direction without the risk of meandering or twisting, and has excellent workability and productivity. The purpose is to provide a manufacturing method. The gist of the present invention is to apply a lower blade with a grooved roll only to the part where the plate thickness of the material of the flat plate shape should be reduced, and at that time, the flow in the width direction of the material causes the groove of the grooved roll to The purpose is to buckle and deform the unrolled portion of the material located therein, and further to roll the buckled and deformed unrolled portion. As the metal strip that can be applied to the method of the present invention, a wide range of metal materials can be used, such as plate materials such as copper, copper alloy, aluminum, aluminum alloy, iron, stainless steel, and composite materials using these materials. In the following, embodiments according to the present invention will be explained with reference to the drawings. A method of manufacturing a strip of irregular cross section according to an embodiment of the present invention is shown in FIG. As shown, a grooved roll 2 having a groove 1 located in a portion where the plate thickness is to be thickened, and a similar grooved roll or a flat roll located facing each other at °C.

A material strip 4a having a flat plate shape is passed between the material strip 4a and the J-rule 3 (in the illustrated case, the J-rule) for rolling. At this time, the material strip 4a is formed between the surfaces of the grooved roll 2 except for the surface where the groove 1 is located.
A low lower blade is added only to the portion 5 to be thin-walled. When a rolling force is applied only to the thin-walled portion 5 of the material strip 4a, the material flows in the width direction due to the deformation of the thin-walled portion 5 to the unrolled state located in the groove 1, as shown in FIG. A certain thick-walled part 6 is buckled, and thus a rolled strip 4b is formed continuously in the longitudinal direction and the rolling direction of the thick-walled part 6 buckled at a certain position in the direction 1. The rolled strip 4b having the thick-walled portion 6 in the buckled state is
As shown in FIG. 3, the irregular cross-section strip 4C is created by passing between a pair of flat-rolls 7°7 and rolling only the thick-walled portion 6 down to a predetermined thickness. be done. In this case, if it is necessary to adjust the shape of the re-rolled strip 4C, it is preferable to further perform finish rolling at a uniform rolling rate using a grooved 11-rule having a predetermined plate thickness relationship. In addition, if it is necessary to adjust the hardness of the strip or to make it evenly processed, it is preferable to perform an intermediate treatment such as annealing while the rolled strip 4b is in a buckled state, and then perform re-rolling. It should be noted that if such intermediate treatment is not required, productivity can be improved by carrying out rolling and re-rolling, and if necessary, finish rolling, on the same line. Furthermore, rolling from a raw material/strip to a strip with irregular cross-section does not necessarily have to be carried out in one pass, as is obvious, but it is necessary to roll the material strip into a strip with different cross-sections, the thickness and width of the strip, and the difference in the cross-sectional thickness of the strip with irregular cross-section. The number of passes should be selected appropriately. In addition, in the case of the above explanation and illustration, the case was taken as an example where a continuous thick part in the longitudinal direction is provided only on one side of the strip. It is also an optional matter to change the number of grooves on the grooved rolls used in the process, or to roll the strip with a pair of grooved rolls so as to provide a thickened portion on both sides of the strip. Additionally, it should be noted that by creating a plurality of thick-walled sections extending in the longitudinal direction and cutting the unnecessary sections into slits, a wide variety of strips with irregular cross-sections can be created using the same grooved roll. As described in 1-1 above, according to the present invention, it is possible to perform rolling using grooved rolls that can increase the flow of material in the width direction 5 of the strip, so that the strip can be rolled continuously in the longitudinal direction to create irregular shapes. It is possible to manufacture cross-sectional strips and prevent the occurrence of meandering, twisting, etc. of the strips, thereby reducing the number of work steps and improving productivity.

[Brief explanation of drawings]

1 to 3 are diagrams showing step-by-step the method according to the invention. 1: Groove, 2: Grooved roll, 4: Strip, 5: Thin-walled portion, 6: Thick-walled portion, 7: Flat roll.

Claims (1)

[Claims] A method of manufacturing a strip of irregular cross-section having a part where the plate thickness increases in the width direction continuously in the longitudinal direction by a rolling method, wherein the plate thickness in the width direction of the strip is manufactured by 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 material flows in the width direction of the thinned part of the strip by rolling, thereby buckling the end rolled part of the strip located in the groove of the grooved roll. A method for manufacturing a strip with irregular cross-section, comprising the steps of deforming the strip and rolling the buckled portion of the strip to a predetermined thickness.