Equal channel angular extrusion device of ultrasonic vibration female die

Abstract

The invention provides an equal channel angular extrusion device of an ultrasonic vibration female die. The equal channel angular extrusion device is composed of an upper template and a lower template. A threaded hole in the upper end of the upper template is connected with a hydraulic plunger on a hydraulic machine. The upper end of a cushion block is connected with the upper template. The lower end of the cushion block is connected with a male die. The male die is fixed in a blocking ring. The upper end of the blocking ring is fixedly connected with the cushion block. The upper end of a guide sleeve is fixedly connected with the upper template. The lower end of the guide sleeve is connected with the upper end of a guide column. The lower end of the guide column is fixedly connected with the lower template. The lower end of the female die is fixed to the lower template. The side face of the female die is fixed through a split stress ring. An ultrasonic vibration device is fixedly connected to the side face of the female die. High-strength ultrasonic waves are input into the female die, high-frequency periodic vibration displacement is generated on the surface of the female die, grain uniformizing and refining of an extrusion piece are improved, and the problems that an equal channel angular extrusion die is nonuniform in grain refining, and cracks exist on the extrusion piece are solved effectively.

Description

technical field [0001] The invention relates to the technical field of metal large plastic deformation, in particular to an equal-diameter angular extrusion device for an ultrasonic vibrating die. Background technique [0002] Ultrafine-grained materials refer to submicron or nanoscale materials with a grain size of 100 nm to 1 um. Ultrafine-grained structure materials often exhibit a series of excellent mechanical properties, such as high strength and good toughness, wear resistance, etc., so they are widely used in aerospace, high-rise buildings, long-span heavy-duty bridges, lightweight energy-saving vehicles, large construction machinery, etc. [0003] Among many refinement methods, severe plastic deformation, as a unique plastic processing method for the purpose of microstructure control, can directly obtain submicrocrystalline and nanocrystalline structures. Equal angular extrusion is currently the most effective severe plastic deformation method for preparing high-p...

AI Technical Summary

Problems solved by technology

The existing ECAP mold has three disadvantages: 1) the surface of the prepared extrusion is prone to cracks or scratches; 2) the uniformity of the prepared sample structure and the distribution of the plastic deformation zone are not good; 3) the existing ECAP mold It is difficult for the prepared ultrafine-grained materials to reach below 200nm in scale

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