Surface Damage of Gold-Ion Implanted Co-WC Micro-Punch Tools during Press Processing

概要

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Surface damage of gold-ion implanted Co-WC micro-punch tools during press processing was evaluated by using a novel die system to monitor changes in the tool surface after each punch. A previously developed micro device fabrication system using micro press forming system was used to fabricate the tools. Despite the advantage of micro scale forming processes in downsizing production, the relative toughness of the formed tools is a serious problem. The lifespan of the tools, particularly punch tools, is too short for manufacturing use. Punch holes are typically smaller than 100 mm, and the fracture toughness is equal to the stress. The lifespan of punch tools can be increased by using the ion implantation method that we previously developed, involving gold ion implantation with post thermal annealing. However the lifespan of ion implanted punch is not enough for manufacturing, we try for clear a reason of this achievement and try to increasing lifespan. In this current study, we used a novel die system to monitor the surface damage of a punch after each punch. Results revealed that adhesion of work material on the punch surface differed between the ion implanted and un-implanted surfaces of the punch tools. The surface modification decreased the adhesion of the sheet metals, thus increasing the lifespan of the punch tool.
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