| 摘要 |
PURPOSE:To feed a hydraulic fluid neither too much nor too little, and to safely and accurately operate an apparatus by setting intervals between a forming section to complete the forming with ascending a main piston, a pressure releas ing section releasing a fluid pressure to return the main piston to the starting position and a hydraulic fluid feeding section. CONSTITUTION:A hatched zone U is the forming section of ascending the main piston, a hatched zone D is the returning section of descending the main piston after finishing the forming, and then the pressure releasing section R to release the oil pressure of the main piston to the atmosphere is provided after a margin section P is provided then, the hydraulic fluid feeding section S is provided to prepare the next working cycle after providing the sufficient margin section P. Furthermore, the next forming section U is started after providing the more sufficient margin section P.
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