Device for realizing reciprocating extrusion process on one-way hydraulic press

Abstract

The invention discloses a device for realizing a reciprocating extrusion process on a one-way hydraulic press. The device is characterized in that a hollow cylindrical cavity is formed in an annular extrusion cylinder; an upper male die and a lower male die which can be in axial sliding in the hollow cylindrical cavity are respectively arranged at the top and the bottom of the hollow cylindrical cavity; a cylindrical blank is placed in the hollow cylindrical cavity; a die core inserted block is clamped and embedded into a groove in the inner cylinder wall of the annular extrusion cylinder to form an annular reduced section; the circumference of the annular extrusion cylinder is fixedly sleeved with a pre-tightening ring; a female die pressing plate is fixedly connected to the top of the pre-tightening ring and is propped against the top surface of the annular extrusion cylinder; a female die composed of the annular extrusion cylinder, the female die pressing plate, the pre-tightening ring and the die core inserted block is formed in the manner that the bottom surface of the pre-tightening ring or the top surface of the female die pressing plate is placed in a downward-concave platform on the top surface of a female die fixing plate to form an upright-placing or inverted state; an nitrogen spring in the hollow cavity of a base forms underpropping to the lower male die. According to the invention, the reciprocating extrusion technology on the one-way hydraulic press is realized in an assisting way, reciprocating extrusion deformation under different extrusion ratios can be satisfied, and the fine and equiaxed fine-grain tissues can be achieved.

Description

technical field [0001] The invention relates to a device for realizing plastic forming, and more specifically relates to a device for realizing a reciprocating extrusion process in a one-way hydraulic press, and the ultrafine-grained material is prepared through the reciprocating extrusion process. Background technique [0002] In view of the shortcomings of traditional materials, it is more and more important to study the transformation of traditional materials and the development and application of innovative materials from the relationship between internal organization, structure and material properties of materials. Improving the performance of materials mostly focuses on the refinement of grains, and the physical and mechanical properties of alloy materials are often significantly improved after obtaining ultra-fine structures. [0003] Large plastic deformation technology, referred to as SPD, has a remarkable ability to refine grains, and can refine the grain structure...

AI Technical Summary

Problems solved by technology

In addition, some people have proposed a device to realize the reciprocating extrusion process on a one-way hydraulic press, but because the billet touches the lower plug, it is a "hard landing", that is, the position of the lower punch is fixed and does not move downward with the billet, and the billet contacts After the punch is lowered, the axial length of the billet in the lower extrusion cylinder will no longer change, which will easily lead to macroscopic folding of the billet in the extrusion cylinder, making the reciprocating extrusion process impossible

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