| 摘要 |
PURPOSE:To enable exact bulging and to improve forming accuracy by performing bulging while regulating the working speed and tuning speed of thrust cylinders. CONSTITUTION:A high pressure liquid is supplied through discharge nozzles 7, 7a into a cylindrical body 1 made of a metal. Thrust cylinders 12, 12a are driven to apply the thrust for advancing, retreating and working to the nozzles 7, 7a so that both ends of the body 1 are pressed by the discharge ports 8, 8a of said nozzles. The body 1 is then worked along the shape of an inverted T- shape space. The thrust force for advancing, retreating and working of the cylinders 12, 12a is controlled by selector valves 15, 15a for servocontrol of flow rates. The control is accomplished by rotating a ball screw 19 by a servocontrol motor 17 operated by a preset program and moving dogs 20, 20a, thereby controlling the position of the valves 15a, 15a. |
