Transactions of Materials and Heat Treatment

Title：Extrusion forming technology of sprag and its influence on high speed steel performance

Authors： XIN Xuan-rong1 2 SHAN Long-long1

Unit： 1. School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471007 China 2.Luoyang Qin Han Cold Forging Co. Ltd. Luoyang 471003 China

KeyWords： W6Mo5Cr4V2 high speed steel sprag axial bending zonal flow eccentric die carbide

ClassificationCode：TG376.2

year,vol(issue):pagenumber：2012,37(5):17-21

Abstract：

A new processing technology for W6Mo5Cr4V2 high speed steel (HSS) used as the extrusion molding of sprag was presented. Through the research of HSS performance under high temperature, analysis of sprag appearance and dimensions, consulting of metal partition flow during simulation process, optimization of female-die structure and technological parameters, the molding technique and die of HSS extrusion technology were designed, and then the feasibility of the technology was verified through large amount of experiments. Meanwhile, the grain size and non conformity of the HSS carbide between before-extrusion and after-extrusion were compared, and the influence of the extrusion technology on the HSS carbide was studied. The hardness of forging pieces after many times of tempering was tested，and the red hardness did not decrease which met the use requirement.

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