Manufacturing method of flange structure

Abstract

The present invention discloses a manufacturing method of a flange structure, which is a method for forming a flange structure with a non-circular flange part that extends from the body to outside, wherein the method comprises the following steps: a first forging step of forming an intermediate formed member with a head which projects in a direction that is matched with a projection direction of a flange part in an anchor block; a second forging step of forming a large flange part forming member with a large flange part which is larger than the flange part in an outer peripheral direction through preventing the restriction of at least one part in the outer periphery of the head from a second mold and a second punching head when the intermediate formed member is pressed to collapse between the second mold and the second punching head; and a punching step of forming a contour of the flange part through performing punching to the large flange part. The manufacturing method of the flange structure can be used for effectively manufacturing a larger projected flange part.

Description

technical field [0001] The present invention relates to a method of manufacturing a flange structure integrally provided with a flange portion. Background technique [0002] For example, an anchor block for a parking brake of an automobile is an iron-steel component having a large elliptical protruding flange portion on the outer periphery of one end portion of a shaft portion. In the manufacture of such parts, since the amount of deformation of the material is large, the forming of the flange portion is mostly performed by hot forging. [0003] However, hot forging requires a large heating device, which increases costs, slows production speed, requires skill, makes it difficult to obtain products with good surface conditions, and requires follow-up processes such as cutting and grinding for parts requiring high dimensional accuracy. Shortcomings. [0004] For this reason, it has been considered to perform all processes by cold forging, but in the case of forming a steel p...

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Problems solved by technology

[0003] However, hot forging requires a large heating device, which increases costs, slows production speed, requires skill, makes it difficult to obtain products with good surface conditions, and requires follow-up processes such as cutting and grinding for parts requiring high dimensional accuracy. Shortcomings

[0004] For this reason, it has been considered to perform all processes by cold forging, but in the case of forming steel parts with large protruding flanges, it is not practical to increase the processing pressure too much

In addition, if the protruding shape of the flange is non-circular such as ellipse, after protruding into a circle by upset forging, it needs to be cut or deburred according to the obtained shape of the flange, and there will be material Poor Utilization Problem

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