Backpressure equal-channel angular extruding mould

Abstract

The invention discloses a backpressure equal-channel angular extruding mould which comprises a pressing plate, a guide pillar, a knocking bar, a convex mould, a guide sleeve, a spring, a concave mould, a mould base, a double-fork type punching head, a heating ring, a positioning slide block, a backpressure ejecting rod and an ejecting rod bracket, wherein the rigidity and strength of punching head are increased by the double-fork type punching head; the positioning slide block capable of sliding back and forth is arranged in a horizontal channel, so that the last sample can be conveniently taken out from the horizontal channel; and backpressure is applied to the sample by a backpressure device in an ejecting rod pressurizing form during an extruding process, so that the extruding temperature is efficiently reduced, the grain is refined and the comprehensive mechanical property of magnesium alloy is improved.

Description

technical field [0001] The invention relates to the technical field of material processing and extrusion, and relates to a high-efficiency back pressure equal channel angle extrusion die. Background technique: [0002] With the development of manufacturing industries such as modern automobiles and aerospace, magnesium alloys are widely recognized for their excellent performance. [0003] growing attention. Magnesium alloys have the lowest density (about 1.74g / cm2) among practical materials. 3 ), high specific strength and specific stiffness, and good damping, good machinability, good electrical and thermal conductivity, the application in automobiles and spacecraft can effectively reduce the overall quality of the product, and has great development potential. [0004] Since the magnesium alloy has a hexagonal close-packed structure, there are only 3 movable slip systems and 2 independent slip systems, and the ductility at room temperature is poor, which limits the wide app...

AI Technical Summary

Problems solved by technology

Although many ECAP extrusion dies have been researched and developed at home and abroad, the existing dies still have the following disadvantages: (1) adopt a simple single punch type punch, such as patents CN2584308, CN1712155, CN1357240, etc.

The biggest disadvantage of the punch-type punch is its low rigidity. When extruding difficult-to-deform magnesium alloys, a large pressure is required, which is prone to bending and instability.

(2) The working efficiency of the mold is low. Every time a sample is extruded, the mold needs to be disassembled to take out the sample or knocked out from the horizontal channel, which is cumbersome to operate

(3) Most of the existing molds do not have back pressure devices, and can only be extruded by traditional extrusion processes, such as CN101797596, CN1792487, etc.

But there are the following defects: (1) the simple punch type punch is adopted, the punch rigidity is not high, and it is prone to bending and instability; (2) the requirements for the hydraulic press are relatively high, and only the three-way hydraulic press can be extruded with this die Magnesium alloy, two-way hydraulic press cannot be used

(3) After one sample is extruded, the mold needs to be disassembled to take out the sample. The operation is cumbersome and the efficiency is low. Multiple samples cannot be continuously extruded.

[0007] To sum up, it can be seen that most of the existing dies can only be extruded under the traditional process, and cannot be extruded at a lower temperature for difficult-to-deform magnesium alloys, and the extrusion efficiency is low

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