Tooth shape processing and molding method of hollow pipe fitting and special mold thereof

Abstract

The invention provides a tooth shape processing and molding method of a hollow pipe fitting, which can ensure that the tooth-shaped surface of the hollow pipe fitting has no defects of collapse, pressure collapse and the like, keep a certain wall thickness of the tooth-shaped part of the pipe fitting, achieve the design process requirements of a product, and the invention further provides a special mold. The special mold comprises an upper mold structure and a lower mold structure, wherein the upper mold structure is connected with a sliding block of a machine tool, the lower mold structure is connected with a lower push-up cylinder of the machine tool, the upper mold structure and the lower mold structure are guided and positioned through an independent sliding guide column structure, the upper mold structure comprises an upper template, a lower padding plate and an upper material pressure plate, the lower mold structure comprises a lower template, the lower template is mounted on a lower padding block, and the lower padding plate and a lower fixing plate are mounted at the upper part of the lower template. The special mold is characterized in that the special mold further comprises a molding punch assembly, a molding guide rod is mounted on the molding punch assembly, a molding punch is mounted on the molding guide rod, and the molding punch assembly is vertically mounted onthe lower mold structure. The upper material pressure plate and a lower material pressure plate clamp the pipe fitting to be processed, and the method is characterized in that the molding punch movesdownwards along the vertical tangent direction of the outer wall of the pipe fitting to be processed.

Description

(1) Technical field [0001] The invention relates to the technical field of surface tooth profile processing of annular hollow pipe fittings, in particular to a tooth profile processing and forming method for hollow pipe fittings and a special mold thereof. (2) Background technology [0002] In order to save energy, reduce emissions, reduce vehicle weight and reduce energy consumption, car manufacturers have changed the structural parts of some models into hollow pipe structures. For example, the headrest frame support rod above the car seat has a hollow tubular structure as a whole, and the surface has several depths. For tooth types with different shapes and sizes, the process requires that the surface of the tooth type must not have a collapse angle, and the tooth type must maintain a certain wall thickness. Since the depth of special-shaped teeth is generally close to the wall thickness of the pipe fittings or even exceeds the wall thickness of the pipe fittings, the use ...

AI Technical Summary

Problems solved by technology

Since the depth of special-shaped teeth is generally close to the wall thickness of the pipe fittings or even exceeds the wall thickness of the pipe fittings, the use of cutting methods for tooth shape forming may easily lead to perforation of the pipe fittings and affect the rigidity of the parts; using ordinary punching and extrusion molding methods, since the parts are hollow parts, The rigidity of the top surface is poor, and the material of the top surface of the hollow pipe is in a cantilever state during the extrusion process, and the bending strength of the material surface is less than the material yield strength and elongation, so the surface of the workpiece working area has not yet been formed. Defects such as collapse and compression occur. For example, adding fillers to hollow pipes and then performing extrusion processing, it is difficult to remove the fillers after the tooth profile is formed, and the processing process is many and the cost is high.

Images