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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.47  No.4 (2006)  >  pp.954-958

MATERIALS TRANSACTIONS
<<Previous article Vol.47  No.4 (2006)   pp.954 - 958 Next article>>

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

Haruo Okahara1), Miyoshi Ohara1), Yorinobu Takigawa2) and Kenji Higashi2)
1) Research and Development Department, Kasatani Co., Ltd.
2) Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University


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.


Keyword:
magnesium, press forming, die, tungsten carbide, grain size, diamond-like carbon (DLC), C-ion implantation

Received: November 28, 2005
Accepted: February 10, 2006 , Published online: April 15, 2006
Copyright (c) 2006 The Japan Institute of Metals

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