DEEP DRAWING OF ALUMINUM ROLLBOUNDED SHEET WITH BIODEGRADABLE LUBRICANTS

The increased use of aluminium roll-bonded sheet in the automobile industry causes problems during the forming process because the aluminium surface of the sheet often leads to cold pick-up on the tool. The tribological system - i.e. the interactions between aluminium-plated steel strip, tool material and lubricant - hence deserves special attention during the forming process. The article discusses applications of biodegradable lubricants during deep-drawing of aluminium roll-bonded sheet wich is produced with two different surface structures in order to improve the lubricant absorption properties. A PC-assisted measuring process for the assessment of the respective tribological systems is intoduced and applied, and the average tribological efficiency is defined as a characteristic quantity.