Variable-mold-clamping-force pipe internal high-pressure forming device and method

Abstract

The invention relates to a variable-mold-clamping-force pipe internal high-pressure forming method, which comprises the steps that after an upper mold and a lower mold are clamped, forming media with certain pressure is filled into a mold cavity, pushing heads on a left side and a right side simultaneously push pipe blanks into the mold cavity from the left side and the right side, the pipe blanks are pressed into the mold cavity to be formed through internal pressurization and axial force application and material compensation under the joint effect of the pressure of the forming media and the material compensation of the pushing heads, and finally the pipe blanks are in fit with the mold cavity to realize part formation. Since different mold clamping forces are adopted at different stages, the defects that the pressure required by the traditional constant-mold-clamping-force tube internal high-pressure forming method is high, the requirements on machine performance, mold performance, sealing performance and mold lubricating performance are high, the machine cost is high, the situation of mold lifting is apt to occur, the part forming pressure is high, large-deformation complex parts cannot be formed, the working efficiency is low and the like are overcome.

Description

technical field [0001] The invention belongs to the technical field of internal high-pressure forming of pipes, in particular to a forming method for internal high-pressure forming of pipes. Background technique [0002] The internal high pressure forming of the pipe is to fill the mold cavity with a certain pressure of forming medium after the upper and lower molds are closed. Cavity, under the joint action of the pressure of the forming medium and the feeding of the push head, the tube blank is pressed into the cavity of the mold through internal pressure and axial force feeding, so as to realize an advanced forming method for part forming. Compared with the traditional forming method, this forming method has the advantages of light weight, saving materials, reducing the amount of subsequent machining and assembly welding, reducing the number of parts and molds, reducing mold costs, high surface quality and mechanical properties of parts, high fatigue strength, and good ...

AI Technical Summary

Problems solved by technology

[0004]The purpose of this invention is to overcome the high pressure required for high pressure forming in the traditional constant clamping force pipe, the requirements for machine performance, mold performance, sealing performance, and mold lubrication performance High machine cost, easy mold lifting, high pressure of forming parts, inability to form complex parts with large deformation, low work efficiency, etc., to provide a mold with small clamping force, low pressure requirements for forming medium, and high performance requirements for machines and molds High-efficiency and high-production-efficiency new tube high-pressure forming method with variable clamping force

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