| Summary: | 碩士 === 中華大學 === 機械與航太工程研究所 === 89 === SKD11-steel and SS41-steel are used as the substrates of die materials which were coated with TiN , CrN and DLC materials. The hot dip galvanized steel sheet was applied to evaluate the galling effect during press processes. According to the results of the surface roughness measurements and the hardness of the coating , surface roughness and hardness of die with coating materials are superior to which without coating materials. On the other hand, in terms of formability and coefficient of friction, die with coating materials also performs better than that without coating materials. Moreover, it was found that DLC coated materials have the best performance of formability, coefficient of friction and galling comparing with CrN and TiN materials. In addition, if considering SS41-steel and SKD11-steel plated with DLC material, SS41-steel is more competitive than SKD11-steel when expense is taken into account.
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