Method for eliminating cylinder bottom sunken portion of warm-cold-formed inner cavity of thin-walled cylindrical piece

Abstract

The invention discloses a method for eliminating a cylinder bottom sunken portion of a warm-cold-formed inner cavity of a thin-walled cylindrical piece. The method comprises the technological steps of warm extrusion and cold sizing. According to the technological step of warm extrusion, the oblique angle alpha of the shoulder portion of the cylinder bottom is directly formed, a reasonable cylinder bottom outer wall oblique angle value is given according to the dimensions, before sizing and after sizing, of the cylindrical piece, and then the technological step of cold sizing is conducted directly. The process flow is shortened, meanwhile the defect of the cylinder bottom sunken portion, formed in the cold sizing process, of the inner cavity of the thin-walled cylindrical piece is overcome, the shape dimension precision and surface quality of the cylinder bottom are guaranteed, the actual production requirements and product standards are met, the material consumption is reduced, the production time is shortened, the production efficiency is improved, and production benefits are improved.

Description

technical field [0001] The invention relates to solving the problem of the sag caused by the detachment of the bottom of the inner cavity and the mold when the thin-walled cylindrical part is cold-finished after warm forming and back-extruded, especially through process design to reduce or even eliminate the thin-walled The invention relates to a gap defect between a mold and a cylinder bottom produced when a cylindrical part is cold-finished and thin-walled during the forming process, and belongs to the technical field of cold-temperature extrusion forming of metal materials. Background technique [0002] Thin-walled cylindrical parts are widely used, and generally have high requirements for the uniformity of thin-walled wall thickness and dimensional accuracy. Thin-walled cylindrical parts used in hydraulic systems also need to withstand high hydraulic loads, and at the same time have high requirements for the flatness and surface quality of the bottom of the inner cavity ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at adding a machining process to cut the oblique angle of the shoulder at the bottom of the cylinder before the cold finishing thin-walled process of the existing thin-walled cylindrical part after warm reverse extrusion to eliminate the depression at the bottom of the inner cavity during the finishing process. In order to solve the problems of increasing production man-hours and wasting materials, a method for determining a reasonable value of the bevel angle of the bottom shoulder of the cylinder is given, and a method of eliminating the bevel angle of the bottom shoulder of the cylinder in the warm extrusion process step is proposed to eliminate thin-walled cylindrical parts The Method of Warm and Cold Forming the Bottom Concavity of Inner Cavity

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