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Relationship Between Dynamic Friction Coefficient of Coatings and Sliding Damage on Press Working Die
Published May 19, 2010 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
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 shape of press worked product by TiC-CVD-coated die was changed due to the adhesion on the die surface. The measurement of dynamic friction coefficient was investigated with VC and TiC-coated specimen. There was not effect of coating type and slid sheets zinc coating on the friction coefficient. On the other hand, the micro galling was observed on the slid steel sheets.