Rotary backward extrusion device for preparing ultra-fine grain pipe

Abstract

The invention discloses a rotary backward extrusion device for preparing an ultra-fine grain pipe. The rotary backward extrusion device comprises an extrusion male die, an extrusion female die and a screw rod nut, wherein the extrusion male die comprises a bearing mounting block, a spiral groove column and an extrusion column which are spliced in sequence, an extrusion support plate is arranged onthe bearing mounting block and is connected with the bearing mounting block through a horizontal bearing, and a spiral semicircular groove is formed in the outer surface of the spiral groove column;an extrusion through hole is formed in the position, which corresponds to the extrusion column, of the extrusion female die; and the screw rod nut is arranged on the extrusion female die, the spiral groove column penetrates through the screw rod nut so as to press a blank into the extrusion through hole, a spiral semicircular groove is formed in the inner surface of the screw rod nut and is consistent with the spiral lead angle of the spiral groove column, the inner groove and the outer groove form a circular channel, balls and a ball return pipe are arranged so as to form a ball circulation channel, pressure is applied to the extrusion support plate, and the extrusion male die generates torsional force under the action of the spiral balls, so that the blank is torsionally extruded. According to the device, composite deformation of backward extrusion and torsion of a pipe can be realized through axial loading, and the high-performance pipe with an ultra-fine grain structure can be obtained through one-time backward extrusion.

Description

technical field [0001] The invention relates to the technical field of extrusion forming of metal materials, in particular to a rotary reverse extrusion device for preparing ultrafine crystal tube materials. Background technique [0002] Pipes are widely used in aviation, automobiles, petrochemicals, construction and other industries. With the lightweight of engineering components and the increasing social requirements for energy conservation and environmental protection, the demand for high-performance pipes is increasing. Among the many methods of strengthening materials, grain refinement is one of the most effective means to improve the comprehensive performance of materials without changing the composition of materials. The severe plastic deformation method developed in the past two decades can refine the structure of conventional coarse-grained materials to the submicron or even nanometer level, and the strength of the material is significantly improved. At present, th...

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Problems solved by technology

However, in the above-mentioned technologies, at least one tooling part is required to be able to rotate, and special equipment or an independent power source is required, which makes the device complicated and increases the cost

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