1. The stroke speed of the movable beam of the hydraulic press depends on the liquid supply of the pump, but has nothing to do with the deformation resistance of the forging in the process. If the liquid supply of the pump is constant, the working speed of the oil compressor is a fixed value.  
2. The liquid supply pressure and power consumed by the pump are related to the deformation resistance of the processed workpiece. When the working deformation resistance is large, the liquid supply pressure and power consumed by the pump are also large, otherwise it is small.  
3. The characteristics of constant travel speed of the movable beam and the change of pump liquid supply pressure can be used as the signal to operate the distributor to realize the automatic control of the oil press.  
4. The basic investment is low, the floor area is small, and the daily maintenance is simple. The hydraulic pumps in the pump direct transmission system are selected according to the maximum working speed and working pressure of the hydraulic press. However, the hydraulic pumps are not fully utilized when the hydraulic press is in small filling stroke, return stroke, auxiliary process and required working pressure, especially the large tonnage hydraulic press, whose utilization coefficient is very low. Therefore, the hydraulic press tends to drive the working speed and working pressure step by step.  
 
Purpose of oil press:  
It is widely used in the processing of spare parts in the automotive industry and the shaping, edge punching and correction of various products in various industries, as well as the press fitting, embossing and forming of shoes, handbags, rubber, molds, shafts and shaft sleeves, the bending, embossing and sleeve stretching of plate parts, washing machines, electric motors, automotive motors, air conditioning motors, micro motors, servo motors, wheel manufacturing, shock absorbers Motorcycle and machinery industries.  
Hydraulic press (a kind of hydraulic press) is a kind of hydraulic press that uses special hydraulic oil as the working medium, uses the hydraulic pump as the power source, and uses the force of the pump to make the hydraulic oil enter the oil cylinder / piston through the hydraulic pipeline. Then there are several groups of mutually matched seals in the oil cylinder / piston. The seals at different positions are different, but they all play the role of sealing, so that the hydraulic oil can not leak. Finally, make the hydraulic oil circulate in the oil tank through the check valve, and make the oil cylinder / piston cycle to do work, so as to complete a certain mechanical action as a kind of machinery of productivity.