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Device and method for preparing fine grains through electroplastic variable-section corner extrusion

A technology of corner extrusion and electroplasticity, applied in the field of metal plastic processing, can solve problems such as easy cracking, and achieve the effects of saving time, improving efficiency, and improving efficiency and uniformity.

Inactive Publication Date: 2016-06-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and method for preparing fine grains through electroplastic variable-section corner extrusion
  • Device and method for preparing fine grains through electroplastic variable-section corner extrusion
  • Device and method for preparing fine grains through electroplastic variable-section corner extrusion

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Embodiment Construction

[0034] Comply with the above-mentioned technical scheme, see figure 1 The device for preparing fine grains by electroplastic variable-section angular extrusion of the present invention includes a mold 1 and an extrusion rod 2, the device also includes a power supply device 3, and the mold 1 is provided with a cylindrical mold cavity 4 and The frustum body mold cavity 5; the cylinder mold cavity 4 and the frustum body mold cavity 5 are connected, and the connecting position of the two forms a corner 6; the extrusion workpiece 7 is pressed between the cylinder mold cavity 4 and the frustum Reciprocating movement in the mold cavity 5; the power supply device 3 is used to apply current to the extruded workpiece 7.

[0035] The working principle of the device of the present invention is as follows: the extrusion workpiece 7 is placed in the cylinder cavity 4, the current is applied to the extrusion workpiece 7 by the power supply device 3, and the extrusion rod 2 is used to extrude...

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Abstract

The invention discloses a device and method for preparing fine grains through electroplastic variable-section corner extrusion. The device comprises a die and an extrusion rod, and further comprises a power-up device, and a cylinder die cavity and a circular truncated cone die cavity are arranged in the die; and the cylinder die cavity is communicated with the circular truncated cone die cavity, and a corner is formed by connecting positions of the cylinder die cavity and the circular truncated cone die cavity. According to the device, the cylinder die cavity and the circular truncated cone die cavity are combined, pure shear deformation of an extruded workpiece and heading deformation of the extruded workpiece are combined, so that the grain refinement efficiency and homogeneity of the extruded workpiece are improved; and in addition, pure shear deformation and heading deformation defects such as easily-occurring cracks, easily-occurring heave types and surface defects disappear in the deformation process. Meanwhile, currents are applied to the extruded workpiece and will generate joule heat when flowing through the die and the extruded workpiece, the metal plasticity will also be improved through the heat, and the time of heating needed for thermal deformation of the workpiece can be shortened.

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 electroplastic 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 d...

Claims

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Application Information

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IPC IPC(8): B21C23/04B21C25/02
CPCB21C23/04B21C25/02
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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