| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus of a short pipe having high cylindrical accuracy by which the efficient manufacture of the short pipe having the high cylindrical accuracy is made possible without any manual work and in a series of stages and apparatus and the productivity is remarkably improved and further a V-shaped groove which is generated after rounding work of a hoop material is eliminated with high accuracy. SOLUTION: This apparatus is composed of an uncoiler 11 for uncoiling the hoop material 1 and supplying a prescribed amount, a preliminarily forming press 12 for receiving and cutting the hoop material 1 supplied from the uncoiler 11 and performing U-shaped bending work and the rounding work and a swaging machine 17 for swaging a tubular work 4 which is fed from the preliminarily forming press 12. The tubular workpiece 4 is fed into a swaging machine 17 by being pushed along a core bar 18 after making the core bar 18 which is extended from the preliminarily forming press 12 to the inside of the swaging machine 17 into a penetrated state in the preliminarily forming press 12. COPYRIGHT: (C)2007,JPO&INPIT
|
