| 摘要 |
PROBLEM TO BE SOLVED: To provide a molding die for bending press which is less likely to be affected by a bending moment and can obtain a cylindrical body with a high roundness.SOLUTION: A molding die for bending press comprises: a pair of right and left dies 1 disposed along a width direction of a plate material S at an interval for supporting the plate material S at two points; and a punch 2 which is movable in a direction to approach or separate to/from the dies 1, and applies bending processing to the plate material S by sequentially pressing the plate material S along the width direction while the plate material S is sandwiched between the dies 1. The punch 2 comprises: a punch tip part 2a having a processing surface K which comes into direct contact with the plate material S and presses the plate material S into a concave shape; and a punch support body 2b for supporting the punch tip part 2a, which is connected to and held by the punch tip part 2a. The punch tip part 2a is provided with the processing surface K which has a processing center O matching a shaft core q of the punch support body 2b, and is formed in a non-uniform circular arc whose radius at a middle region in the width direction is the maximum radius. |
