Inflatable thermal forming method and forming die for vertical pipe

Abstract

The invention provides an air expansion thermal forming method and forming die for a vertical pipe. The air expansion thermal forming method comprises the specific steps that an upper punch and a lower punch are initially pre-tightened; the upper forming insert is connected with the lower forming insert through a positioning pin, so that a cavity channel space is defined by the cavity surfaces of the upper forming insert and the lower forming insert; after the alloy pipe blank to be machined is sealed, a temperature control device is adopted for heating a mold, so that the temperature of the alloy pipe blank to be machined reaches the forming temperature, then gas is introduced into the alloy pipe blank to be machined, pressure is generated in the alloy pipe blank to be machined, and a hydraulic machine is used for applying axial thrust to the alloy pipe blank to be machined for material supplementing; and then the hollow part is obtained through gas expansion forming. The method can ensure that the wall thickness of a formed part is uniform, equipment requirements are reduced, the method is suitable for machining various aluminum magnesium alloy pipes into variable-section parts, application of hollow variable-section parts made of light alloy materials is promoted, and progress of aviation, aerospace and automobile industry technologies is promoted.

Description

technical field [0001] The invention relates to the technical field of forming alloy pipes, in particular to an air expansion thermoforming method and a forming die for vertical pipes. Background technique [0002] The structure of "replacing reality with space" has been widely used in many industrial fields such as aviation, aerospace, and automobile. The parts adopt a hollow variable cross-section structure, which can meet the load requirements on the one hand, and achieve the purpose of reducing weight and saving materials on the other hand. [0003] Commonly used manufacturing methods for hollow variable cross-section parts include segmental welding, high-pressure liquid-filled forming, etc. The reducing pipe produced by welding method has weld seam defects, so its rigidity and corrosion resistance are poor, which limits its application range. The high-pressure liquid-filled forming technology mainly passes high-pressure liquid into the interior of the alloy tube blank...

AI Technical Summary

Problems solved by technology

However, there are problems such as unstable forming temperature, serious thinning of the wall thickness of the formed part, poor sealing performance, and high equipment requirements in the method of pipe inflation forming, which greatly restricts the popularization and application of pipe inflation forming. Therefore, a new method is urgently needed. The forming structure and method to solve the above problems

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