Lubrication and galling in stamping of galvanized AHSS--Part II: Evaluating the deep-drawing performance of stamping lubricants

摘要

This study illustrated that the drawing test was able to distinguish the performance of different stamping lubricants in forming AHSS under near-production conditions. Based on performance evaluation criteria, Lubricants A and B were most effective, regardless of BHF Lubricants C, D, E, and F resulted in good drawn parts at a BHF of 30 tons, but all showed fractures at a BHF of 70 tons. In deep drawing, no severe galling or powdering was observed. The lubricants' performance was found to change with the contact pressure at the sheet-tool interface and the forming speed. Therefore, it is critical to evaluate lubricants under process-relevant test conditions.