| 摘要 |
PROBLEM TO BE SOLVED: To provide a forging die that prevents a burr projection from forming within a clearance between a tip end of a knock-out pin and a pin hole even when the tip end thereof is worn and thereby prevents defective formation as a result.SOLUTION: Relief sections 131 and 132 are extended from pin holes 111B and 112B in a direction of separating from a forming section 117 and are formed deeper than one surface of flash lands 111A and 112A. A material sliding in an adjacent area to the pin holes 111B and 112B easily enters the relief sections 131 and 132. Therefore, even when clearances 115 and 116 between tip ends of knock-out pins and the pin holes 111B and 112B become large after tip ends of knock-out pins 113 and 114 are worn out, the material can be prevented from entering into the clearances 115 and 116. |
