| 摘要 |
PURPOSE:To manufacture an oblique pipe with high efficiency in short time without consumable parts by pressing the end of the oblique pipe to the side face of a pipe by means of a lower die profiling the side face of the pipe and an upper profiling die provided with a punch, pressing the profiling face to the side face of the pipe and subjecting the pipe to resistance welding. CONSTITUTION:The end of the oblique pipe 2 is pressed by the lower die with the hole profiling the side face of the pipe 1 and the upper profiling die with the punch for expanding the inside hole, by which the end of the pipe is subjected simultaneously to expanding, flaring and curving. The profile-worked surface parts 2a-2c are pressed to the side face of the pipe 1 and are subjected to resistance welding. The surfaces 2a-2c are uniformly welded to the side face of the pipe 1. The oblique pipe is formed in extremely short time without consumable parts and the productivity is improved. |
