Composite inner and outer hydraulic pressure forming method for high-branch height thin-wall three-way pipe

Abstract

The invention discloses a composite inner and outer hydraulic pressure forming method for a high-branch height thin-wall three-way pipe, belongs to the technical field of inner high pressure forming and aims to solve the problem that the branch height of the formed three-way pipe is limited in the conventional inner high pressure forming method. The method comprises the following steps of: filling liquid media inside a pipe billet and discharging gases through a supercharger, and moving a left-side punch and a right-side punch forwards to finish pipe end seal, so that inner pressure of the pipe billet is insufficient, and the pipe billet deforms; filling liquid media on the outer side of the pipe billet through holes on a die, wherein outside hydraulic pressure is sealed by a sealing groove on the die and a sealing ring on the punch, so that the pipe billet has plastic deformation under the action of inner pressure, outer pressure, axial feeding of the left and right punches and retreating of the branch punch, and obtaining the high-branch height three-way pipe. Compared with the traditional inner high pressure forming method, the method has the advantages of high branch pipe height and high pipe surface quality, and is particularly suitable for thin-wall three-way pipe forming.

Description

technical field [0001] The invention relates to an internal and external hydraulic composite forming method of a thin-walled tee pipe with a high branch height and belongs to the technical field of internal high pressure forming. Background technique [0002] Traditional tee forming methods mainly include welding forming and flexible medium bulging. Welding methods mainly include stamping half-pipe butt welding method and branch pipe insertion welding method. These two methods have problems such as difficult welding, poor accuracy and reliability, and uneven inner wall of tee pipe affecting fluid flow performance. The flexible medium bulging method includes the polyurethane bulging method and the hydraulic bulging method. Since the bulging of the tube blank is completed only through the force transmission of the flexible medium, there are problems such as uncontrollable wall thickness at the top of the branch pipe and limited height of the branch pipe. [0003] Compared wit...

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that in the process of forming a tee pipe by the existing internal high-pressure forming method, the tube blank is pressed against the mold by the internal pressure. With the increase of the liquid pressure, the gradually increasing friction between the tube blank and the mold hinders the tube In order to solve the problem that the end material flows into the mold cavity, the height of the branch pipe is limited. The present invention proposes a method of hydraulic composite forming of the inner and outer sides of the thin-walled tee with high branch height.

Images