Multi-directional composite multi-channel screw extrusion die for metal blank

Abstract

The invention relates to a multi-directional composite multi-channel screw extrusion die for a metal blank. The extrusion die is formed by embedding two semicircular grooves with semi-symmetric tapers in a die sleeve with a taper, wherein a heating ring is mounted outside the die sleeve; a combined die and the die sleeve are connected to an upper die plate at the lower part; metal blank extrusion passages are formed in the horizontal and vertical directions inside the combined die, and an upper punch, a left punch and a right punch which are T-shaped are precisely arranged on a crossed passage in a matched mode; a spiral groove is formed in the lower passage of the extrusion passage; a section of extrusion die holes with reduced cross sectional areas are formed in the outlet passage of the combined die. The die can solve the problem that the blank size is short after repeated extrusion, so that the plastic deformation capacity, surface quality and structure property of the blank are improved, and a block ultra-fine grain material with excellent performance can be prepared at a lower temperature; the die is simple in structure, convenient to assemble and disassemble and easy to put and fetch materials, so that the material forming efficiency is effectively improved, the blank deformation is continuous, coordinated and stable, and the structure and performance after deformation are better.

Description

technical field [0001] The invention belongs to a die for processing and extruding metal materials, in particular to a high-efficiency metal billet multi-directional composite multi-channel spiral extrusion die. Background technique [0002] In recent years, the preparation of bulk ultrafine-grained materials with excellent properties based on large plastic deformation technology has become a research hotspot in the field of materials science. Among them, the equal-diameter angular extrusion method is recognized by international material research scholars as the most representative and promising large plastic deformation method because of its advantages of simple process and relatively low cost. During the angular extrusion deformation process, the billet that closely matches the size of the die channel and is well lubricated with the die wall moves downward under the action of the punch pressure, and when it passes through the intersection of the two channels, it produces a...

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Problems solved by technology

[0008] In order to overcome the problems of limited plastic deformation ability of metal billet, low working efficiency of die and short billet size after multi-pass extrusion, the present invention provides a multi-directional composite multi-channel spiral extrusion die for metal billet, which is different from traditional equal-diamet

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