1, the speed of the active beam of the hydraulic press depends on the amount of fluid supplied by the pump, and is independent of the deformation resistance of the forgings in the process.
If the liquid supply of the pump is constant, the working speed of the hydraulic press is fixed.
2, the pump fluid pressure and the power consumed and the deformation resistance of the machined workpiece, the working deformation resistance is large, the pump fluid pressure and the power consumed is also large, the reverse is small.
3, can take advantage of the active beam stroke speed is constant and pump fluid pressure changes characteristics, as a signal to manipulate the distributor, in order to achieve automatic control of the hydraulic press. 4, the basic investment province, covers a small area, daily maintenance and maintenance is simple. The hydraulic pump in the direct transmission system of the pump is selected according to the maximum working speed and working pressure of the hydraulic press, while the hydraulic pump is not fully utilized when the filling stroke, backhaul, auxiliary process and the required working pressure are small, especially the large tonnage hydraulic press, and its utilization coefficient is very low.
As a result, hydraulic press tends to grade drive at working speed and working pressure