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Die life improvement of flat type punches for hot forging Morihiko Nakasaki, Koji Era, Hiroyuki Myochin and Ichiro Takasu Synopsis: Since forged products have been required more complex and net-shape, the tool cost tends to increase day by day. The improvement of the die life is a crucial matter for the reduction of processing cost on forging business. In this report, a case of the die life improvement was introduced. The die life of flat punches due to erosion crack for hot forging was improved by using the punch with a center air vent. Consequently, the followings were found through the CAE analysis and forging experiments; (1) The erosion cracks in this case was due to the spout of the lubricant trapped between a punch and a work, not in the room at the last stage of forging. It occurs under the high pressure over the criteria of the lubricant spouting out. (2) The higher pressure increasing rate, the shorter life of flat punches regarding life due to erosion cracks. (3) To prevent the erosion crack of punches, it is effective to establish an air vent at the center of the contact surface. key words: erosion crack, net shape, air vent, hot forging, 3-D CAE analysis, die life, pressure, lubricant