Bent member, and device and method for manufacturing same

Abstract

Provided are a bent member having a bend having a minute bend radius which is, for example, not more than 1 to 5 times the thickness of the member, and a device and a method for manufacturing the bent member. A first support means (11) disposed at a first position (A) supports a rectangular pipe (16) while feeding the rectangular pipe (16) in the longitudinal direction, a heating means (12) disposed at a second position (B) partially heats the rectangular pipe (16), and a cooling means (13) disposed at a third position (C) cools the rectangular pipe (16). When working the rectangular pipe (16), a shear force application means (14) which is disposed in a downstream region (D) is moved two-dimensionally or three-dimensionally in two directions at the same time, the two directions being the feeding direction of the rectangular pipe (16) and the direction substantially parallel to one lateral cross-section of the rectangular pipe (16), said lateral cross-section being located at a position in the longitudinal direction and being that which is heated by the heating means (12). By doing so, a shear force is applied to the heated portion of the rectangular pipe (16), and as a result, a bent member (21) is manufactured.

Description

technical field [0001] The invention relates to a bending member, a manufacturing device and a manufacturing method of the bending member. More specifically, the present invention relates to a curved member having an extremely small curved portion such that the bending radius is, for example, 1 to 5 times the thickness (thickness of a material), and a manufacturing apparatus and method for the curved member. Background technique [0002] It is desired to have a high-strength, light-weight, and compact metal strength member, reinforcing member, or structural member having a curved shape that is used in automobiles, various machines, and the like. Conventionally, such bent members have been produced by welding press-worked products, punching thick plates, forging, and the like. It is difficult to further reduce the weight and size of curved members manufactured by these manufacturing methods. [0003] Non-Patent Document 1 discloses that such a curved member is produced by a...

AI Technical Summary

Problems solved by technology

However, due to cold working, there is a risk of cracks in the processed blank when the same bending process is performed on high-strength materials

[0021] In particular, it is difficult to use this technology to process blanks above 980MPa

In addition, even if cracks are avoided, since the processing load required to form a steel pipe with high strength and a large wall thickness becomes extremely large, the processing equipment has to be made into a relatively large equipment, and the equipment cost is significantly increased.

[0022] Therefore, even with the invention disclosed in Non-Patent Document 3, it is difficult to mass-produce a bent member having an extremely small bending radius (for example, 1 to 5 times the wall thickness) at a low cost, and it is not possible to process high-strength Tube blank

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