• Journal of Korea Society of Industrial Information Systems
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• v.12 no.3
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• pp.1-9
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• 2007

This paper deals with manufacturing conditions to increase the working die's life span which are the key factor in the manufacturing process of the coins and medals. Using the boundary element method, the stress diagram for the coining die was obtained, which was used to find the life span of working die. To iud the working die's life span related to the diameter of collar and blank coin, eight different sizes were tested and the optimal condition was obtained. With the adjusted impressing force, the working die's life span was increased up to 60 percent.