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A. Hydraulic press structure
The hydraulic press is composed of the main engine and the control mechanism. The main engine part of the hydraulic press includes the body, main cylinder, ejector cylinder and liquid filling device, etc. The power mechanism is composed of a fuel tank, a high-pressure pump, a low-pressure control system, an electric motor, and various pressure valves and directional valves. Under the control of the electric device, the power mechanism realizes the conversion, adjustment and delivery of energy through pumps, cylinders and various hydraulic valves to complete the cycle of various technological actions.
B. Classification of hydraulic press
Hydraulic presses are classified according to their structure: four-column hydraulic presses (three-beam four-column type, five-beam four-column type), double-column type hydraulic presses, single-column type hydraulic presses (C-shaped structure), frame type hydraulic presses, etc.
According to the use of hydraulic press: mainly divided into metal forming hydraulic press, bending hydraulic press, drawing hydraulic press, punching hydraulic press, powder (metal, non-metal) forming hydraulic press, press fit hydraulic press, extrusion hydraulic press, extrusion molding, etc.
C. The hydraulic press directly driven by the hydraulic pump has the following characteristics
1. The stroke speed of the movable beam of the hydraulic press depends on the liquid supply of the pump, and 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 hydraulic press is a fixed value.
2. The supply pressure and the power consumed by the pump are related to the deformation resistance of the workpiece to be processed. The working deformation resistance is large, and the supply pressure and the consumed power of the pump are also large, and vice versa.
3. The characteristics of the constant stroke speed of the movable beam and the change of the pump supply pressure can be used as a signal for operating the distributor to realize the automatic control of the hydraulic press.
4. The basic investment is low, the area is small, and the daily maintenance and maintenance are simple. The hydraulic pumps in the direct drive system of the pump are all selected according to the maximum working speed and working pressure of the hydraulic press. However, the hydraulic pumps are not fully utilized when the filling stroke, return stroke, auxiliary procedures and required working pressure of the hydraulic press are small, especially It is a large-tonnage hydraulic press, and its utilization factor is very low. Therefore, hydraulic presses tend to be staged transmission of working speed and working pressure
D. Purpose of hydraulic press
It is widely used in the processing of parts and accessories in the automotive industry and the shaping, blanking, correction of various products in various industries, as well as the pressing, embossing, and plate parts of shoemaking, handbags, rubber, molds, shafts, and bushings. Bending, embossing, sleeve stretching and other processes, washing machines, motors, automobile motors, air-conditioning motors, micro motors, servo motors, wheel manufacturing, shock absorbers, motorcycles and machinery industries.
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