Hydraulic forming press system and press method thereof

Abstract

A hydraulic pressing system for forming a workpiece and its pressing method are disclosed. The part A to be expanded maximally and a part B linked to said part A and to be bent are first expanded and said part B is then bent inward by upper and lower dies to obtain the beautiful contour with minimal curvature radius.

Description

technical field [0001] The invention relates to a hydraulic forming pressing system and a pressing method thereof. More specifically, the present invention relates to a hydroforming pressing system and a pressing method thereof that first expand a maximum expansion portion and a curved portion connected thereto, and then fold the curved portion inwardly. Background technique [0002] Generally, the hydroforming method is performed at room temperature (10° C.-30° C.) by a sheet metal forming method of expanding a tube using hydraulic pressure. [0003] The hydroforming method is a very effective method for lightening pressed articles, such as front side members and bumpers in the automobile industry, which can reduce the production cost of pressed articles. [0004] In addition to steel alloys, recently, high-strength aluminum alloys have been widely used for pipes in the hydroforming method to reduce the weight of the pipes. [0005] High-strength aluminum alloys are less ...

AI Technical Summary

Problems solved by technology

[0012] However, as shown in FIG. 8, when the minimum radius of curvature portion is formed at the maximum expansion portion P1, the expansion of the hydraulic pressure is not sufficient to allow the pipe to flow sufficiently toward the minimum radius of curvature portion P2.

In this case, problems arise, such as the thickness of the tube 100 at the portion P2 having the smallest radius of curvature becomes very small, or worse, cracks may occur (C)

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