| 摘要 |
PROBLEM TO BE SOLVED: To provide a punch die capable of simplifying the structure of a punch guide, and mounting and de-mounting a punch body and a retainer collar on and from the punch guide.SOLUTION: A punch die comprises: a vertical key groove 9 formed in the inner circumference of a cylindrical punch guide 3, into which a punch body 5 having a punch blade 5B at its lower end portion is inserted; a punch driver 13 fitted vertically movably in a retainer collar 11 fitted rotatably and fixedly on the upper face of the punch guide 3; and an elastic member 25 interposed between a punch head 19 screwed on the upper end side of the punch driver 13 and the retainer collar 11 for biasing the punch driver 13 upward. The punch die further comprises: a peripheral groove 31 communicating with the key groove 9 on the upper side of the inner peripheral surface in the punch guide 3; a cylindrical part 29 disposed in the lower portion of the retainer collar 11 and capable of being inserted into the punch guide 3; and an engaging protrusion 33 disposed on the outer circumference of the cylindrical part 29 and capable of passing through the key groove 9 and engaging with the peripheral groove 31. |
