Optimization of Die Material and Its Surface Coating for Press Forming Magnesium Alloy

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  • Okahara Haruo
    Research and Development Department, Kasatani Co., Ltd.
  • Ohara Miyoshi
    Research and Development Department, Kasatani Co., Ltd.
  • Takigawa Yorinobu
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Higashi Kenji
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University

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Grain sizes of die material and die surface coatings were examined with the achieving mass-production of magnesium alloys by advanced continuous press forming. The results showed that there is an optimum tungsten carbide grain size of 1 to 2 μm for press-forming AZ31 magnesium alloy in terms of surface roughness fluctuation. It was also shown that the adherence of the DLC coating was improved by implanting C ions into the tungsten carbide surface. 10,000 times square-cup drawings were successfully achieved at 543 K using C-ion implantation and a DLC coated die together with a newly developed heat-resistant lubricant.

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