No.6（2003）5.An evaluation method for the adhesion of DLC coated tools intended for plastic forming

Akio MOTOI, Seiji KATAOKA and Kazuo MORIKAWA

Increasingly more severe restrictions on lubricants or cleaning agents in metal forming necessitate looking for methods to reduce or eliminate their use. Utilization of dry deep drawing, and the possibility of dry deep drawing is suggested at the laboratory-level. This involves using DLC for easily oxidizable aluminum materials. However, there is a fatal problem of exfoliating from the tool surface in DLC when it comes to high-pressure. Scratch test, pushing test, and a friction test were used for ball-on-disk equipment to test for the adhesion of DLC coated tools. The relationship between surface conditions, perpendicular loads and adhesion was determined in the examination. Friction tests using ball-on-disk equipment is the most suitable as an evaluation method of tribo-characteristics with DLC coated tools.

Keywords
Deep drawing, Tribology, DLC coated tools, Adhesion

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