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Device for preparing fine grains through variable section angular pressing and method thereof

A technology of corner extrusion and variable section, applied in the field of metal plastic processing, can solve problems such as easy cracking, and achieve the effect of saving time, improving efficiency and uniform extrusion deformation force

Inactive Publication Date: 2016-05-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the reciprocating extrusion process, the workpiece is easily cracked due to its restraint

Method used

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  • Device for preparing fine grains through variable section angular pressing and method thereof
  • Device for preparing fine grains through variable section angular pressing and method thereof
  • Device for preparing fine grains through variable section angular pressing and method thereof

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Embodiment Construction

[0029] Comply with the above-mentioned technical scheme, see figure 1 , the device for preparing fine grains by variable cross-section angular extrusion of the present invention includes a mold 2 and an extrusion rod 1, a cylindrical mold cavity 5 and a conical mold cavity 4 are arranged in the mold 2, and the taper of the conical mold cavity 4 is α; the cylindrical cavity 5 and the conical cavity 4 are connected, and the connecting position of the two forms a corner 3; Internal reciprocating motion. Wherein, the cylindrical mold cavity 5 is vertically arranged, and the conical mold cavity 4 is horizontally arranged.

[0030] The working principle of the device of the present invention is as follows: the extrusion workpiece 6 is placed in the cylinder cavity 5, the extrusion rod 1 is used to extrude the extrusion workpiece 6, and the extrusion workpiece 6 passes through the corner 3 under the action of pressure to make a corner After deformation, reach the conical body mold ...

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Abstract

The invention discloses a device for preparing fine grains through variable section angular pressing and a method thereof. The device comprises a die and a pressing rod. A cylindrical die cavity and a circular truncated cone die cavity are formed in the die. The taper of the circular truncated cone die cavity is alpha. The cylindrical die cavity and the circular truncated cone die cavity communicate mutually. A turn angle is formed in the connection position of the cylindrical die cavity and the circular truncated cone die cavity. Under the action of the pressing rod, a pressed workpiece reciprocates in the cylindrical die cavity and the circular truncated cone die cavity. According to the device disclosed by the invention, the cylindrical die cavity and the circular truncated cone die cavity are combined; the turn angle is formed, so that the pressed workpiece is subjected to continuous integral pressure in the turn angle position, pressing deformation force exerted on the pressed workpiece is more uniform under shear stress, and the grains are improved in fineness and more uniform. Through the pressing method disclosed by the invention, the conditions of nonuniform deformation and even non-deformation of the middle of the workpiece in the cyclic variable section pressing process are eliminated.

Description

technical field [0001] The invention belongs to the field of metal plastic processing, and relates to a device and a method for preparing fine crystals by variable-section angular extrusion. Background technique [0002] As a deep plastic deformation method that can effectively refine grains and improve the mechanical properties of materials, large plastic deformation technology (SPD) has obvious advantages in the preparation of fine-grained materials. At present, the large plastic deformation technology favored by the scientific community has Equal channel angular extrusion technology (ECAP), reciprocating extrusion technology (CEC), high pressure torsional deformation technology (HPT), etc., these methods for preparing fine-grained materials have been widely used. There are still many problems in the above-mentioned large plastic deformation method, which need to be overcome. The fine-grained material prepared by ECAP has a tendency to texture. During the deformation proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/04B21C25/02
CPCB21C23/001B21C23/04B21C25/02
Inventor 乔柯王快社王文李天麒陈鹏
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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