Trobological Model in Sheet Metal Punch Friction Test

• Main Authors: Chi-Chia Liu, 劉志嘉
• Other Authors: Tze-Chi Hsu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/25236653292398333837

碩士 === 元智大學 === 機械工程研究所 === 83 === Lubrication and friction play a very important role in sheet metal forming process. Despite the complexity and importance of friction models such as the Amontons-Coulomb constant friction coefficient, most current simulations of metal forming processes use relatively simple friction models such as the Amontons- Coulomb constant friction coefficient. A realistic friction model should include the internal variables such as lubricant film thickness, tooling roughness and workpiece roughness. In the present reseach, the punch friction tests which use a tensile strip experiment to simulate the streching of sheet over a punch corner redius in a typical draw die were used to measure the internal variables effects in every regime friction condition. The theoretical prediction of friction coefficient will be compared with the experimental measurements. Examples of various stretching situation will be provided in the paper.