Equal-channel corner revolving extrusion die and method

Abstract

The invention discloses an equal-channel corner revolving extrusion die and method and belongs to the field of material machining. The die comprises bolts and die sections, bolt holes are respectively and correspondingly arranged in the two die sections, and the two die sections are fastened with the bolts. Parting surfaces of the two die sections cling to each other completely to form a structure with the center being an extrusion cavity of the die, the extrusion cavity is an equal-channel corner extrusion die cavity, and the equal-channel corner extrusion die cavity is sequentially provided with a die cavity leading-in section, a die cavity leading-in transition section, a die cavity corner section, a die cavity leading-out transition section, a die cavity leading0out section and a die cavity taking-out section. The equal-channel corner revolving extrusion die has the advantages of high grain refining capability, convenience in operation, simple structure and continuous extrusion.

Description

technical field [0001] The invention relates to an equal-channel rotary-angle extrusion die and a method thereof, belonging to the field of material processing. Background technique [0002] In recent years, equal channel angular extrusion (ECAP) has become one of the fastest growing technologies for severe plastic deformation (SPD). ECAP can make the material accumulate a large amount of plastic deformation without changing the cross-section of the sample during plastic deformation, so as to achieve repeated deformation and grain refinement of the material. [0003] The main shear deformation zone of the traditional ECAP forming technology is located at the corner of the mold channel, and there is a shortage of uneven material deformation. Chinese Invention Patent Publication No. CN 1709605A, Invention Name: U-shaped equal-channel repeated extrusion device for preparing ultra-fine-grained materials. This patent uses two consecutive equal-channel extrusions to achieve the p...

AI Technical Summary

Problems solved by technology

In addition, the L-shaped, U-shaped, C-shaped, S-shaped corner reciprocating extrusion dies and repeated upsetting proposed in the Chinese invention patent applications with publication numbers CN101259493, CN1709605, CN2757953, CN2757954 and CN2768921 respectively The rough extrusion die is only a simple form improvement of the ECAP method, and there is no substantial industrial innovation and solution to production problems

In order to overcome the problem that the traditional ECAP technology cannot be continuously produced, many improved ECAP technologies have been proposed at home and abroad, such as continuous shearing process, rotary die ECAP, repeated side extrusion, equal angle rolling and other methods (Chinese Journal of Nonferrous Metals , 2010, 20(4): 587), but the above-mentioned ECAP improvement technology has industrial problems such as large engineering force and high equipment requirements

[0004] To sum up, the traditional ECAP mold and extrusion method have the disadvantages of uneven deformation and small cumulative strain in one pass, while the improved ECAP forming method also has the disadvantages of expensive equipment and high requirements for equipment, and the processing cost problems such as increase

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