| 摘要 |
PURPOSE:To prevent the reduction in thickness of the outside of a bending pipe caused at the time of a pipe being work with a high frequency bender by giving a brake force, bending moment and bending stress to the piping at pipe bending time and by controlling the pushing force constantly by these three powers. CONSTITUTION:A high frequency bender of a push bending type is composed of an arm 4 having the rotary center on the different position O' from the bending center O of a pipe, a clamping part 5 holding a part of the piping 1 which is on the arm 4 thereof, a rotation supporting stand 9 giving a rotation power to the clamp part 5 thereof, a sliding base 10 moving the rotation supporting base 9 thereof in a body with the clamp part 5 in a longitudinal direction of the arm 4 and the brake device 11 giving a braking force to the arm 4. At the pipe bending time, then a brake force F, bending moment M and bending stress W are given and the push force is controlled constantly by these three forces. |
