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Sliding Damage and Dynamic Friction Property Between Coated Press Working Die and Blank Sheet
Published May 23, 2012 by Society of Automotive Engineers of Japan in Japan
In this study, we examined the damage of coatings on press working die in the slide loading condition. The SKD11 was selected as the base metal of the test piece because of frequent application as die steel. The slide tests could be carried out with making our own testing dies on actual press working condition. On the slide tests, VC-TRD and TiC-CVD coating were selected. The slide damage of TRD coatings was smaller than that of CVD coatings. The slide damage of coatings was quantitatively evaluated by the X-ray diffraction technique and surface roughness. The surface damage was the adhesion of zinc moved from the hot dip galvanizing blank sheet. The measurement of dynamic friction coefficient was investigated with VC, TiC, TiCN coated and no coated specimen. On the sliding condition with high contact pressure, the dynamic friction coefficient increased with the rise of the contact pressure due to the adhesion of zinc from galvanized blank sheet. The dynamic friction coefficient could be useful parameter on evaluating the damage of coatings on the die surface.