Transactions of Materials and Heat Treatment

Title：A friction model considering lubricant film thickness and sliding speed in sheets metal forming

Authors： Zhou Guozhu1 Luo Renping2 Dong Xianghuai1

Unit： 1.Shanghai Jiao Tong University 2.SAIC General Motors Co. Ltd.

KeyWords： lubricant film thickness sliding speed friction model lubrication condition galvanized steel sheets

ClassificationCode：

year,vol(issue):pagenumber：2016,41(4):98-103

Abstract：

The friction characteristics directly affect the quality of stamping parts. By analyzing the forces acting on the coated metal sheet under the boundary lubrication and the fluid lubrication respectively, a friction model was proposed considering both lubricant film thickness and sliding speed under the mixed lubrication state. The influences of lubricant film thickness and sliding speed on the friction coefficient of galvanized steel sheets were studied by planar sliding test, and the friction model parameters of galvanized CR4 steel sheet were obtained under the experimental conditions and then were verified. It is concluded that the friction coefficient decreases with the increase of lubricant film thickness, and eventually tends to be stable; and it also decreases with the increase of sliding speed. With the increase of lubricant film thickness and sliding speed, the percentage of the contact area between the die and the sheet coating in the actual contact area decreases, and the friction force decreases theoretically.

Funds：

国家自然科学基金资助项目（51275297）

周国柱（1991-），男，硕士研究生

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