Hot reverse-extrusion forming mold for large cup shell

Abstract

The invention discloses a hot reverse-extrusion forming mold for a large cup shell, relating to a reverse-extrusion forming device. The invention can reduce a hot reverse-extrusion forming force of the large cup shell and solves the problem of low production efficiency in the prior art. A reverse-extrusion punch head is assembled on a pressure head of a pressing machine; an inner cavity of a reverse extrusion cylinder consists of a material-filling cavity, a transitional step and a reverse extrusion cavity, and the lower end of the reverse extrusion cylinder is provided with a limiting step; a base is fixed on a workbench surface of the pressing machine; the inner cavity of the base consists of an upper inner cavity, a middle inner hole and a lower inner cavity; the lower inner cavity is provided with a bearing base plate; a center hole of the bearing base plate is slidably matched with a mandril of the pressing machine, and an upper end face of the bearing base plate supports a material-ejecting rod; a big end of the material-ejecting rod is slidably matched with the middle inner hole, and a small end of the material-ejecting rod is slidably matched with a reverse extrusion cavity; an outer wall of the limiting step is slidably matched with a wall surface of the upper inner cavity; a flange is fixed with the upper end of the base by bolts; n cylindrical helical compression springs which are uniformly distributed are arranged between the reverse extrusion cylinder and the base, wherein n and m are positive integer.

Description

technical field [0001] The invention belongs to the technical field of cup-shaped parts forming, and in particular relates to a thermal reverse extrusion forming device for large cup-shaped parts. Background technique [0002] Reverse extrusion molding technology is an advanced metal pressure processing technology with less cutting and no cutting. It has the characteristics of "high efficiency, high quality and low consumption", and has high use value in technology and economy. [0003] Cup-shaped parts are typical parts of reverse extrusion. For the preparation of cup-shaped parts, the reverse extrusion molding technology is mostly used at home and abroad. Since the material is in a state of three-dimensional compressive stress during the reverse extrusion molding process, the material has strong resistance, and when the metal flows, it moves relative to the punch and die, and the friction is relatively large, which requires high equipment tonnage. In order to reduce the ...

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Problems solved by technology

[0004] In order to reduce the hot reverse extrusion forming force, the patent application "A Method and Die for Making Hot Forging Ring Blank of Generator Guard Ring (Application No. 200510012565.2)" adopts the method of wrapping the blank to reduce the size of the generator retainer ring. Forming force when hot forging ring blanks, the patent application "a large ring tube forging hot extrusion molding process and device (application number is 200910074230.1)" adopts the method of dividing one deformation into multiple deformations to reduce the size of large ring tubes These methods can reduce the hot reverse extrusion forming force and achieve the purpose of "small equipment doing big work", but the production efficiency is low

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