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열처리가 와이어 컷 방전 가공된 금형의 수명에 미치는 영향
최계광(K-K Choi),이용신(Y-S Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
On-line experimental studies are carried out in order to investigate the effects of heat treatment on the life of a press die manufactured by W-EDM. In general, W-EDM results in rougher surface than milling, but the surfaces by W-EDM are acceptable in many application fields as press dies. In this work, two machining processes such as milling/grinding and WEDM are examined. Also, two ways of heat treatment after W-EDM are tested. Thereby, four manufacturing processes for a press die are considered: (1) milling and then grinding, (2) wire-cut electric discharge machining (W-EDM), (3) low temperature heat treatment after WEDM, and (4) high temperature heat treatment after W-EDM. On-line punching experiments for an automobile part of BL646-chain are performed. The amount of wear of the die and punch, roll-over and burnish depth in the punched chain are measured every 10,000 strokes. Overall productivities with the dies manufactured by four manufacturing methods are carefully compared. Finally, it is suggested that heat treatment at high temperature followed by W-EDM is very attractive as a fast and cheap manufacturing method for the press die.