| 摘要 |
PURPOSE:To easily work by arranging one pair of forming dies at the end part of a pressure cylinder and also a pressure shifting member in the one forming die, and working a pipe as keeping a pressure in the blank pipe to the prescribed pressure through a pressure difference between the inner and the outer parts of the blank pipe and a pressing force. CONSTITUTION:One pair of the forming dies 3, 4, having die face are arranged at both opening ends of the pressure cylinder 2, which is set in an apparatus frame 1. The upper die 4 is shifted toward advancing and retreating directions to the lower die 3, and also a pressure rod 19 as a pressing-shifting member is connected with the forming die 4. The blank pipe 7 is set as positioning between the both dies 3, 4, and then, pressure oil is supplied from hydraulic supply and exhaust ports 14, 15 into the blank pipe 7 and between the pipe 7 and the pressure cylinder 2, and next the pressure between the pipe 7 and the pressure cylinder 2 is reduced and at the same time, the shaft direction is pressured up by the pressure rod 19. As the pipe is worked through the pressure difference between the inner and the outer parts of the pipe 7 and the pressing force by the pressure rod 19, the working operation is executed easily and exactly.
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