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Blank for equal-channel corner extrusion

A technology of equal channel corners and blanks, which is applied in the field of channel corner extrusion, can solve the problems of irregular product shape and easy damage of molds, and achieve the effects of reducing punch mold breakage, inhibiting expansion, and reducing grinding time.

Pending 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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  • Blank for equal-channel corner extrusion
  • Blank for equal-channel corner extrusion
  • Blank for equal-channel corner extrusion

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 a blank for equal-channel corner extrusion. The cross section of the blank is rectangular, and is matched with the cross section of an L channel. The blank comprises a sample layer, and a modification layer connected with the side surface of the sample layer; and the hardness of the modification layer is lower than the hardness of the sample layer. Firstly, as the modification layer with the hardness lower than the sample layer is combined with the sample layer (metal material) with higher hardness, when the blank is suffered by acute plastic deformation, under the buffer effect of the modification layer, the probability of rapture and bending of a convex mold and deformation of a concave mold is reduced. Secondly, due to the limitation of the modification layer, the expansion of the sample layer can be inhibited to a certain extent by the modification layer. Moreover, through adjustment of the size of the modification layer, the sample layers with different sizes can be manufactured as blanks with the same size, so that the operative operation can be performed under the condition of invariable original molds.

Description

technical field [0001] The invention relates to the technical field of equal channel angular extrusion, in particular, to a green body for equal channel angular extrusion. 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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IPC IPC(8): B21C23/00
CPCB21C23/001
Inventor 佘其海关新兴李超卢磊
Owner SOUTHWEST JIAOTONG UNIV
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