Boundary Friction Model in Punch Friction Test

• Main Authors: Shang-Guey Kuo, 郭祥貴
• Other Authors: Tze-Chi Hsu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/63809872048228303991

碩士 === 元智大學 === 機械工程研究所 === 82 === In the present research, the punch friction tests which use a tensile strip experiment to stretching of sheet over a punch corner radius in a typical draw die were used to measure the friction coefficients.Experimental variables include the mechanical properties and surface topography of material were measured before the stretching. The friction coefficients were then calculated from the exten- sions of the tensile strip. A mathematical model of sheet stretching over a cylindrical pin with boundary lubriction regime has also been developed. The theoretical prediction of friction coefficient was then compared with the experim- ental measurements.