A kind of mixed forming method of conical cylindrical part with straight cylinder and flaring

Abstract

The invention belongs to the field of manufacturing, and in particular relates to a method for mixing constriction and flaring of a conical cylindrical piece with a straight cylinder, which can be used for extrusion manufacturing of the conical cylindrical piece. The process includes: firstly machining a circular truncated and cylindrical one-piece tube blank with equal inner diameter and smaller outer diameter; then using a lower concave die to perform a hot compression on the tube blank to form a straight tube with a small diameter at the lower end; The mouth die is expanded twice to form a conical cylinder part with a large diameter at the upper end and a small diameter at the lower end. In order to prevent the instability of the tube blank when the neck is shrinking, the upper end of the tube blank is cooled before the necking is deformed (the cooling method is water cooling), and a protective mold is installed in the concave mold. Compared with the traditional free forging process, the forming process involved in the present invention has high forming efficiency, good dimensional accuracy, less forming processes and heating times, and improves the structure and performance of the parts.

Description

technical field [0001] The invention belongs to the field of manufacturing, in particular to a method for forming a conical cylindrical piece with a straight-tube conical shape, which can be used for extrusion manufacturing of the tapered cylindrical piece. Background technique [0002] The traditional free forging manufacturing method is the free forging process. After the ingot is blanked, it undergoes upsetting, punching and reaming, and then a V-shaped anvil mandrel is used to elongate it into a conical billet, and then the horse bar is expanded to make a large cone. Shape the cylinder, and finally shape the basic shaped cylinder or use a special mold to complete the molding. The forming steps of this process are cumbersome and complicated, and it is difficult to control the shape and size of the blank during the process of elongation and reaming, which requires a large working allowance to ensure the dimensional accuracy of the product, resulting in waste of materials, ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a shrinking and flaring mixed forming method for a tapered cylindrical part with a straight cylinder to solve the problems of large margin of finished product, low material utilization rate and poor forging stability in free forging of a conical cylindrical part with a straight cylinder.

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