A real-time online heating constant temperature and other channel corner extrusion device and method

Abstract

The invention discloses a real-time online heating constant temperature and other channel corner extrusion device and method, comprising a heating body, an insulating sleeve, an extrusion concave die, a concave die sleeve, a concave die fixing seat and an extrusion rod; the extrusion concave die The whole is conical, which is installed in the female die sleeve, the female die sleeve is fixedly connected with the female die fixing seat, and the extrusion die is provided with an extrusion channel, and the extrusion rod is matched with the extrusion channel. The extrusion channel is composed of an extrusion channel, an extrusion channel and an extrusion corner, wherein the cross-sectional size of the extrusion channel is smaller than the cross-sectional size of the extrusion channel; the connection position of the extrusion channel and the extrusion channel forms an extrusion corner, and the extrusion channel The angle of the turning angle is 90-150°; a hole is arranged around the extrusion channel, an insulating sleeve is placed in the hole, and the heating body is placed in the insulating sleeve.

Description

technical field [0001] The invention relates to the field of metal plastic deformation, in particular to an on-line heating constant-temperature equal-channel corner extrusion device and method. Background technique [0002] The statements herein merely provide background related to the present invention and do not necessarily constitute prior art. [0003] Equal channel angular extrusion technology is a special method for refining the grain structure of materials by using severe plastic deformation. This technology was proposed by Soviet scientist Segal in 1977, and its original purpose was to prepare bulk ultrafine-grained metal materials. The basic principle is that the material undergoes almost pure shear plastic deformation at the corner of the channel, so that the grain It is refined, the mechanical and physical properties are improved, and the shape and size of the cross-section of the sample before and after deformation can be kept unchanged, so multiple passes of ...

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Problems solved by technology

The advantage of non-isothermal angular extrusion is that the mold structure is simple and the operation process is flexible. The disadvantage is that during the transfer and extrusion process of the material, due to the inconsistency between the ambient temperature and the mold temperature, the temperature drops and the temperature distribution is uneven. Extrusion The temperature of the material is uncontrollable, which may easily cause cracks on the surface of the sample material, making it impossible to carry out multi-pass repeated extrusion deformation

The process of constant-temperature equal-channel angular extrusion is controllable, and the surface quality of the material after extrusion deformation is good, which is conducive to the accumulation of large plastic deformation through repeated extrusion deformation in multiple passes. However, the mold structure of this method is complicated, especially for high-strength alloys such as titanium alloys. Equal-channel angular extrusion of metal materials requires high extrusion temperature, high requirements on the high temperature resistance of the mold, easy wear of the mold, high energy consumption, and high production cost of ultra-fine-grained materials

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