Hydraulic bulge forming for large-sized structure parts.
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概要
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In Conventional pipe truss structures, large stress concentration occur at the welded joints, making it difficult to achieve weight reduction of the structures. Therefore, bulge formed joint pieces are usually interposed among the main pipe and the branch pipes in the welding of the structures.The joint pieces can reduce the stress concentration since forces generated at the joints during welding flow smoothly throughout the joint pieces, and additionally make the welding procedure easy.However, a bulge forming method has been applicable only to small sized parts not to large sized structure parts. We have developed the hydraulic bulge forming equipment which can be applied to large sized structure parts as well as small one and established the forming techniques. The equipment is very compact in size and low in cost due to our sophisticated designs.This paper describes the hydraulic bulge forming equipment for large sized structure parts, forming conditions and the quality of the bulge formed joint pieces.
- 一般社団法人 日本高圧力技術協会の論文