Evaluation of Friction Properties of Sheet Forming Lubricants by Tensile Drawing and by Ring Compression.

摘要

Experimental and selected commercially available sheet forming lubricants were evaluated by two friction testing techniques; (1) strip-drawing with only elastic workpiece loads and (2) ring compression testing where plastic deformation of the workpiece occurred. Material and test variables examined were; (1) two workpiece materials Al-7075 and Ti-6Al-4V, (2) eight lubricants coatings, (3) three levels of hold-down pressure and deformation amount, (4) two die roughness conditions, (5) two drawing speeds and (6) two lubricant dryness conditions. The tests were performed at room temperature. Results indicate that the lubricant dryness condition can be a significant factor in friction characteristics of the lubricant. Of the other variables, the lubricant type caused the most influence on the resultant friction characteristics. Quantitative ratings of each lubricant were obtained as a function of the test variables. (Author)