Internal high pressure-forming method for special-shaped tube

Abstract

The invention provides an internal high pressure-forming method for a special-shaped tube, which adopts a one-die multi-tube manner. The method includes the following steps: analyzing and affirming relevant technique data through a computer-aided emerging tool; providing a raw tube, arranging the raw tube in a forming die, performing pre-forming on the raw tube, allowing the linear tube to be bent into the S-shaped tube, and obtaining a pre-forming tube; putting the pre-forming tube in a compression die, and eliminating interference between the pre-forming tube and an internal high pressure die; putting the pre-forming tube without interference in the internal high pressure die, applying the internal high pressure on the pre-forming tube and allowing the pre-forming tube to form a tube with a desired shape. The method can stably and reliably form the special-shaped tube through the one-die multi-tube manner, wherein the special-shaped tube has a serious demand for the wall thickness and has a big end and a small end, the diameter change between the big end and the small end is large. The method can effectively overcome the defects of large wall thickness change and cranks during forming, can save cost, and can improve benefits.

Description

technical field [0001] The invention relates to technical fields such as CAE (computer-aided engineering) analysis technology, pouring and bending, profiling, material heat treatment, multiple internal high-pressure forming, sawing and shaping, and more specifically, the present invention relates to a special-shaped pipe fitting. Forming method. Background technique [0002] 1. Internal high pressure forming technology [0003] Internal high pressure forming technology refers to the complex forming process of pipe fittings mainly through the combined action of pipe internal pressure and axial feed. [0004] 2. The main process of single-piece internal high pressure forming technology [0005] The tube high pressure forming process can be divided into three stages: (1) filling stage, the tube is placed in the lower mold of the mold, and then the upper mold is closed to fill the tube with liquid and discharge the gas, and the two ends of the tube are leveled The punch is se...

AI Technical Summary

Problems solved by technology

[0010] Another technical problem to be solved by the present invention is to provide an internal high-pressure forming method for special-shaped pipe fittings, which can effectively solve defects such as large changes in product wall thickness and easy cracking during the forming process, saving costs and improving benefits

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