Method for forming long tube part with partial convexity

Abstract

The invention relates to a formation method of a long pipe-shaped part with partial embossment and solves the problems of poor strength and stiffness, complex processes and high cost due to the adoption of a present production method that a pipe with partial embossment is first formed and then assembled and welded into a long pipe-shaped part with partial embossment. The method of the invention isthat: firstly, both ends of a pipe (1) are sealed by a sealing device (2); secondly, a small-sized mold is designed according to the shape of the partial embossment; thirdly, a heating device (6) isused for heating the mold; fourthly, the pipe (1) is injected with high-pressure liquid or high-pressure gas through a channel (7) on the sealing device (2); fifthly, when the pipe inside a mold cavity of the mold is completely deformed and matched with the mold cavity, the long pipe-shaped part with partial embossment is then obtained. The invention is characterized by small size of the mold, equipment table and tonnage. Compared with the traditional formation method, the part produced by the method has the advantages of low cost, good overall performance and surface quality.

Description

technical field [0001] The invention relates to a method for forming a partially convex long tube part. Background technique [0002] At present, in order to save energy consumption and reduce pollution emissions, it is required to realize lightweight manufacturing in high-energy-consuming fields such as automobiles and aircraft. The main way to reduce weight is to use lightweight materials and lightweight structures. Lightweight materials include aluminum alloys, magnesium alloys, titanium alloys and composite materials. Lightweight structures mainly include thin shell parts, hollow variable cross-section parts and integral components. For hollow variable cross-section parts, the traditional manufacturing process is generally to stamp two halves and then weld them into a whole. The process is complicated and the quality is difficult to guarantee. If the internal high pressure forming method is used, such parts can be formed at one time. The so-called internal high-press...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems that the strength and rigidity of the parts produced by the existing forming method are poor, the overall performance cannot meet the design and use requirements, and the production process is complicated, the production cycle is long and the cost is high, the present invention provides a method suitable for partial parts. The forming method of the protruding long tube part, the specific technical scheme to solve the above problems is as follows:

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