Wrinkle prevention forming mold and forming method of bent half-pipe

Abstract

The invention provides a wrinkle prevention forming mold and forming method of a bent half-pipe. The forming mold comprises an upper mold, a lower mold and a plurality of wrinkle prevention buffer pads. A lower mold body is a concave face which is matched with the outline of a bent half-pipe part. The upper mold is a convex face corresponding to the concave face. When the upper mold is matched with the lower mold, a gap as thick as one material is reserved between the upper mold and the lower mold. The wrinkle prevention buffer pads are in a flat shape and are placed on the lower mold face, the contour of the wrinkle prevention buffer pads is identical to that of the concave face of the lower mold face, and the size of the wrinkle prevention buffer pads is slightly smaller than that of the lower mold face. Parts are formed sequentially according to the number of the wrinkle prevention buffer pads arranged between the upper mold and the lower mold, and stamping needs to be conducted repeatedly to complete part formation.

Description

technical field [0001] The invention relates to a stamping and forming technology for aircraft sheet metal parts, in particular to an anti-wrinkle bending half-pipe forming die and a forming method. Background technique [0002] Stamping, as a major branch of sheet metal forming, plays a key role in industrial production. In the traditional stamping forming, the blank holder is usually used to assist the forming, but most of the blank holder is passively restricting the flow of the sheet metal. When forming workpieces with complex shapes and large deformations, due to the different flow rates generated by each part of the sheet material, defects such as wrinkling, dead wrinkles, excessive wall thickness reduction and even cracking are easily generated, which seriously restricts the efficiency of the stamping forming process. Scope of application. [0003] At present, there are a large number of half-pipe parts in the production of aircraft parts, and the traditional proces...

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Problems solved by technology

[0004] In order to solve the problems of wrinkles, dead wrinkles and springback in the stamping process, the invention provides an anti-wrinkle bending half-pipe forming die and forming method, which combines the traditional stamping technology with the buffering effect of elastic media and effectively solved the above problems

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