Device capable of realizing accurate control of equal-channel angular extrusion processing route

Abstract

The invention discloses a device capable of realizing accurate control of an equal-channel angular extrusion processing route, which comprises an extrusion stem (1) and an extrusion female die (2); the extrusion female die (2) is divided into two half female dies which are connected through a plurality of bolts, a fixing ring (3) is sleeved at the periphery of the extrusion female die (2), the transverse cross-section of a female die channel (5) for the extrusion female die (2) takes a shape of regular polygon (N>=4), a section of extrusion channel (6) with slightly small sectional dimension is arranged at the position where an outlet channel of the female die channel (5) is adjacent to the corner, and the rest part of the outlet channel of the female die channel (5) is the same as the dimension of an inlet channel; and scales (7) at equal intervals are arranged on the surface at the inlet of the female die channel (5). The device is an equal-channel angular pressing device, which has the advantages of simple structure and reliable performance and can realize the wide-range of processing route and accurately control the rotational angle.

Description

technical field [0001] The invention relates to a device capable of realizing precise control of processing paths of equal-channel angular extrusion. Background technique [0002] Ultra-fine-grained materials have a series of excellent mechanical and physical properties. Equal-channel angular extrusion is a relatively simple process for preparing bulk ultra-fine-grained materials. The material passes through the corner of the channel due to strong shear deformation. The grains are refined, and because the cross-sectional size of the exit channel and the entrance channel of the extrusion die are consistent, the cross-sectional size of the material remains unchanged after extrusion, and repeated extrusion can be realized, and large plastic deformation occurs to make the grains significantly finer. change. The experimental results show that the grain size can be less than 1 micron or even reach nanometer level by extruding more than 8 passes with a die angle of 90° for pure al...

AI Technical Summary

Problems solved by technology

In principle, the experimental device with a circular cross-section can realize any angle of rotation or processing path, but the rotation angle cannot be accurately controlled during the insertion process of the sample, and unnecessary rotation of the sample may also occur during the extrusion process, and when this When the rotation occurs, the operator cannot determine the specific rotation angle

The experimental device with regular quadrilateral cross-section can realize the rotation of 0°, 90° or 180°, but cannot realize the rotation of other angles

In addition, the sample after equal channel angular extrusion may become slightly larger than the entrance channel due to the recovery of elastic strain, which is inconvenient for the sample to be placed again.

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