| 摘要 |
PURPOSE: A punching method of a pipe is provided to increase the service life of a punch and a die by forming the cut part of a punch and a die in an obtuse angle. CONSTITUTION: A punching method of a pipe is as follows. A pipe(10) is provided between a die(4) and a pad. The pipe is fixed with die and pad. A slide punch plate and a punch(1) are descended by a push plate. The pipe is provided between die and pad. The die is arranged in the external side of the pipe. The punch is arranged in the inner surface of the pipe. |
