| 摘要 |
In a forming machine of the hydraulic press or forging machine type having at least one press cylinder acted on by a pair of values of stroke frequency and stroke volume predetermined by a first piston pump, the stroke frequency and stroke volume of the press cylinder can be adapted to the working requirements from cogging to planishing if the press cylinder has associated with it a second piston pump in parallel with the first piston pump and having a second pair of values of stroke frequency and stroke volume different from the first pair of values, and if the two piston pumps can be switched to connect them to the press cylinder simultaneously or alternatively.
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