Transactions of Materials and Heat Treatment

Title：Improved design and research of die unloading installation in cold extrusion die of spherical slippery footstep

Authors： ZHENG Wei-gang1 SHU Hao1 WU Qi-shan1 2 TENG Sheng-lei1 HE Xin1 MA Xiao-xiao1(1.College of Mechanical Engineering and Automation Guizhou University Guiyang 550003 China 2.Mechanical Electrical Department Guizhou Industry Polytechnic College Guiy

Unit：

KeyWords： spherical slippery footstep precise extrusion die gradient die unloading

ClassificationCode：TG385.4

year,vol(issue):pagenumber：2009,34(3):100-102

Abstract：

A high-precision spherical slippery footstep cold forming die was introduced. The die could make slippery footstep take shape, but the die core often broke, and thin-walled port of slippery footstep extruded section had micro-plastic deformation. Through the analysis of the rupture of die core and the pushing-out deformation, it was improved by making conical surface coordinate take the place of step coordinate and using gradient die unloading to displace previous die unloading. The improvement solved the rupture of die core and the pushing-out deformation. It effectively protected the extrusion die and ensured pieces dimensional accuracy. The results show that it has high practical value.

Funds：

贵州省重大专项基金项目(黔科合重大专项字(2007)60054号)

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