The most important difference between a servo hydraulic press and a general hydraulic press is the power source. One is to use the hydraulic oil cylinder in the hydraulic system to generate pressure, and the other is to use compressed air as the power source and use the pressure cylinder to execute the equipment. This is the essential difference between them. The development of servo hydraulic presses is heavily influenced by servo motors. Now hydraulic presses driven by servo motors are mainly small-tonnage presses. In order to break through the constraints of the servo motor, the hybrid drive method is now a direction of press development. The construction method of this hybrid drive press adopts a differential wheel to complete the mixed input of general motors and servo motors, and adopts a two-degree-of-freedom rod system to complete a hybrid two-point press. Its characteristics are:
(1) High versatility, flexibility and intelligence.
Because of its servo function, the slider motion curve is no longer just a sine curve, but an arbitrary curve that can be optimized and planned according to process requirements.
(2) High precision.
Because the linear grating ruler is used to detect the orientation of the slide, the slide has the entire press operation; high motion control accuracy, especially near the dead point, can ensure that the accuracy of the slide is changed within ±0.01mm; thus ensuring the press The accuracy of the closed height is stable during the production process, which suppresses the appearance of product burrs and avoids the occurrence of defective products.
(3) High productivity.
The servo hydraulic press retains the advantages of the crank press, especially its productivity is much higher than that of the hydraulic press, which embodies the "processing quality of the hydraulic press and the production power of the mechanical press". Not only that, the servo motor-driven crank press can also adjust the stroke of the slider according to the different workpieces. It is not necessary to complete a 360-degree rotation in a work cycle, but only a certain angle of swing to complete the stamping operation, which further shortens the cycle time. The maximum limit cuts unnecessary trips and greatly improves productivity.
