Equal-channel angular pressing method

A technology of equal channel corner and extrusion method, applied in the field of channel corner extrusion, can solve problems such as easy damage of molds and irregular product shapes, and achieve the effects of inhibiting expansion, reducing punch breakage, and saving time and cost.

Active Publication Date: 2019-07-05
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The first object of the present invention is to provide a blank for equal channel angular extrusion, to solve the technical problem that the mold is easily damaged in the prior art
The second object of the present invention is to provide an equal channel angular extrusion method, which can easily solve the technical problem of irregular product shape caused by back pressure in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The cross-section of the green body for equal channel angular extrusion in this embodiment is square, including the sample layer 1 and the modified layer bonded to the side of the sample layer 1, and the hardness of the modified layer is lower than that of the sample layer. The hardness of layer 1, the tensile strength of the modified layer is less than the tensile strength of the sample layer 1; the yield strength of the modified layer is less than the yield strength of the sample layer 1. The sample layer 1 is an iron plate. The modified layer is a polymer sheet, and the polymer sheet is an HDPE sheet. The surface of the green body is provided with a lubricating layer, and the lubricating layer is molybdenum disulfide lubricant.

[0066] Such as figure 1 As shown, the modified layer includes a first modified layer 21 and a second modified layer 22 respectively arranged on a group of opposite sides of the sample layer 1, and the first modified layer 21 and the second...

Embodiment 2

[0069] Compared with Example 1, the green body for equal channel angular extrusion in this example has the difference that: the sample layer 1 is an iron plate. The modified layer is a polymer sheet, and the polymer sheet is a PP sheet.

Embodiment 3

[0071] Compared with Example 1, the green body for equal channel angular extrusion in this example has the difference that: the sample layer 1 is a tantalum plate. The modified layer is a polymer sheet, and the polymer sheet is a PE sheet.

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Abstract

The invention discloses an equal-channel angular pressing method. The equal-channel angular pressing method comprises the steps of (1) billet extruding: a billet is placed into an extruding segment ofan L channel and extruded to a molding segment; (2) billet pushing: a particle material is placed into an extruding segment to be extruded so as to make the billet be pushed out of a discharging opening of the molding segment; and (3) particle material taking out. Firstly, a strip-shaped object can be used to stretch into the molding segment to take the extruded particles out, back pressure cannot be formed, namely, when the billet is extruded each time, the residue extruded at the last time does not exist in the L channel, so that the billet is always the first to be extruded out, the shapeof the obtained billet is not parallelogram or diamond, while the regular cuboid shape is retained, the waste of the material cannot be caused, and the polishing time can be reduced during multi-passextruding; and secondly, the loading force required by adopting the particle material extruding is significantly lower than the extruding force by adopting the back pressure manner, and the energy consumption can be significantly reduced.

Description

technical field [0001] The present invention relates to the technical field of equal channel angular extrusion, in particular to an equal channel angular extrusion method. Background technique [0002] Large plastic shear deformation technology, as an important grain refinement method for metal deformation, can effectively improve the grain size of materials, regulate the microstructure (orientation, grain boundary misorientation, etc.) of metal materials, and improve the quality of metal materials. Hardness, improve the destructive strength of metal materials. During the large plastic deformation process of metal materials, the material produces higher density dislocations, and causes dislocation accumulation, entanglement, rearrangement, etc. A large number of dislocation entanglements, dislocation cells, and high-density dislocation walls are formed inside the material, resulting in the formation of sub-grains during the deformation process of the material, which are fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00
CPCB21C23/001
Inventor 佘其海吴瑶瑶李超卢磊
Owner SOUTHWEST JIAOTONG UNIV
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