軟質アルミニウム板のしごきを伴う絞り加工性と潤滑油の関係

抄録

Effects of lubricating oils on the drawability of soft aluminum sheets and on the surface condition of drawn cups were studied using different punch-die clearances. The limiting drawing ratio increases with decreasing the clearance at low drawing speed, decreases at high drawing speed at the clearance +50 to 0%, and takes a maximum value at the clearance -10% by the use of lubricating oils. Lubricating with a mineral oil intensifies the surface damage on drawing and ironing faces of the products formed at low drawing speed, and lubricating with oils containing 10% oleic acid and oxidized oil moderates it. If drawn at high speed using a mineral oil, traces of oil-pits are observed on the ironing face of drawn cups and the surface damage is considerably moderated. Metal transfer by adhesion of the worked sheet to the die surface is significant by the use of a mineral oil at clear- ances 50 and 0% at low drawing speed, and is markedly decreased by the use of mineral oil and lubricating oils containing 5% chlorinated paraffin at high drawing speed