Abstract No.:
2778

 Scheduled at:
Tuesday, September 27, 2011, Saal A 3:15 PM
Metals Processing 1


 Title:
Development of distortion compensation technologies for press die in the automotive industry

 Authors:
Gyuyeol Bae* / Kinetic Spray Coating Laboratory, Division of Materials Science and Engineering, Hanyang University, Korea
Hyungkwon Park / Kinetic Spray Coating Laboratory, Division of Materials Science and Engineering, Hanyang University, Korea
Juyeon Won/ Kinetic Spray Coating Laboratory, Division of Materials Science and Engineering, Hanyang University, Korea
Wanghyun Yong/ Kinetic Spray Coating Laboratory, Division of Materials Science and Engineering, Hanyang University, Korea
Kicheol Kang/ Kinetic Spray Coating Laboratory, Division of Materials Science and Engineering, Hanyang University, Korea
Changhee Lee/ Kinetic Spray Coating Laboratory, Division of Materials Science and Engineering, Hanyang University, Korea

 Abstract:
The press die technologies in the automotive industry have recently attracted great attentions due to the complexities of car body design. The difficulties of press forming arising from the partial pressure difference have raised primarily the local distortion of the formed products. To date, the compensation methods using an elecric welding have been utilized to modify the micron-scale dimensions of the die. However, these methods are shown to have some drawbacks such as inefficiency for thickness control and serious thermal distortion of the die inherent from the welding process. In order to solve these problems, the relatively low temperature spraying processes have been introduced. Four different Fe-based alloy powder materials were spray-formed onto grit-blasted actual die block (nodular cast iron) substrates using both high velocity oxy-fuel (HVOF) and kinetic spraying. The databases of spraying parameters for micron-scale thickness control were established. Also, the as-sprayed and heat-treated coatings were evaluated and compared in terms of mechanical properties such as microhardness, bond-strength and wear resistance considering the effects of microstructure and phases. Finally, the optimized processing conditions and materials will be proposed for novel press die distortion compensation technology.

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