1. Reasonable choice of hydraulic equipment hydraulic equipment, to avoid the loss of flow caused by oil, the hydraulic system should be based on the working pressure and the maximum flow through the valve to select the hydraulic components. When selecting the relief valve, the maximum flow rate of the hydraulic oil is selected. When selecting the throttle valve, the minimum steady flow should also be taken into account. Other valves should be selected according to the maximum flow required by the access circuit. The maximum flow rate should not exceed 20% of its rated flow rate.

　　2. Reasonable adjustment of the hydraulic system The pressure of the various pressure valves, as long as the normal operation of the hydraulic equipment to meet the circumstances, as much as possible to take lower pressure. Therefore, in the oil circuit with the back pressure valve, the pressure adjustment of the back pressure valve to ensure the stability of the working speed prevail. For a dedicated hydraulic device, the pressure is adjusted by the back pressure and friction in the cutting tool system required to machine the workpiece.

　　3 reasonable selection of speed control system Hydraulic equipment system speed regulation involving hydraulic pump actuator and control valve. The first use of pressure feedback variable pump oil supply, by the throttle or speed control valve to change the flow into or out of the hydraulic cylinder to achieve the movement of the speed adjustment, and the pump drain and the system requirements to adjust the amount of Speed system.

　　The joint speed control circuit used in a limit pressure variable vane pump and speed control valve joint speed control; 2 differential pressure variable piston pump and throttle joint speed control; 3 differential pressure variable vane pump and throttle Joint speed control. The above-mentioned volume governor circuit, good stability, no throttle effect, pump power loss, thereby weakening the oil temperature rise.

　　4 reasonable choice of hydraulic equipment used in the system viscosity and quality of oil viscosity, will increase the resistance of the oil flow loss; oil viscosity is low, will make a serious leak, the pump's volumetric efficiency is reduced, both will make oil The temperature rises.

　　It is best to use the temperature rise when the viscosity of the smallest changes in the oil can be used to stabilize the silicon-based oil, etc., while the oil should be kept clean and timely replacement or add new oil.