Metal powder sintering and in-situ equal channel extrusion hydraulic press and extrusion method under atmosphere protection or vacuum

Abstract

The invention provides an atmosphere protection or vacuum metal powder sintering and in-situ equal-channel extrusion hydraulic press, which includes a frame, an upper pressure head, a lateral pressure head, a movable workbench, a furnace body, an atmosphere protection device and a hydraulic system. The atmosphere protection device is connected with the furnace body, the frame is an L-shaped frame mechanism, and the frame includes a U-shaped horizontal beam, two horizontal columns, a second movable beam, four upright columns, an upper beam and a first movable beam. The invention has the advantages of simple structure, convenient operation, integration of sintering and equal-channel extrusion forming, and the function of atmosphere protection and vacuum pumping. The metal powder in the traditional process needs to be transferred to a press after being sintered and cooled and taken out, and then heated up for thermal equal-channel deformation. It can be sintered and in-situ equal-channel extrusion to form block materials with fine microstructure and excellent comprehensive properties, which overcomes the shortcomings of cooling and secondary heating between powder sintering and primary equal-channel extrusion deformation in the traditional process. Effective unification of powder sintering and subsequent cumulative deformation is achieved.

Description

technical field [0001] The invention relates to the field of metal powder sintering and extrusion, in particular to a hydraulic press and extrusion method for metal powder sintering and in-situ equal-channel extrusion under atmosphere protection or vacuum. Background technique [0002] Powder metallurgy is an industrial technology for producing metal powder or using metal powder as a raw material, forming and sintering to produce metal materials, composite materials and various types of products. Powder metallurgy technology is a near net shape technology, which has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability. [0003] Sintering can realize the consolidation of metal powder and obtain a certain density, but there are often holes and defects inside the sintered billet, and the structure of the sintered material is often relatively coarse, and the follow-up large plastic deformation...

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Problems solved by technology

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a hydraulic press for metal powder sintering under atmosphere protection or under vacuum and in-situ equal-channel extrusion, which can solve the problem of easily oxidized metal powder in the process of sintering under atmosphere protection or under vacuum conditions. Difficult problems such as oxidation, poor comprehensive mechanical properties of materials, and inability to integrate multi-pass high-temperature large plastic deformation forming can prevent the need for cooling and secondary heating between powder sintering and deformation processes to cause coarsening of the microstructure and comprehensive mechanical properties of sintered materials Reduced shortcomings, thereby improving production efficiency, saving energy, and shortening the process

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