Classification Of Servo Presses

Servo presses are divided into servo crank presses, servo connecting rod presses, servo screw presses and servo hydraulic presses.
1. Servo crank presses
General mechanical crank presses are eccentric teeth that drive the slider crank to move up and down, and the curve is a sine curve. Generally, the maximum nominal tonnage is reached before the slider runs to the bottom dead center. The stroke is fixed and cannot be adjusted. General hydraulic presses use liquid to transmit pressure, so the engineering tonnage can be achieved at any position of the slider stroke. The stroke is adjustable but the efficiency is low.
The servo press controls the movement of the slider through the motor, and combines the advantages of mechanical presses and hydraulic presses through pre-programming. It can achieve any type of stamping production at any stage of the stroke, and the pressure curve can be arbitrarily programmed.
Among the existing crank-driven servo press products, there are Komatsu's H1F series composite servo press, Aida's NS1-D series CNC servo press, Yamada's Svo-5 and Mag-24 servo presses, Tsunano's Servo Link servo press, and Jinfeng's CM1 servo press.
2. Servo screw press
The traditional double-disc friction drive screw press has a large energy consumption after the machine is started, and the impact force is greatly affected by human factors, resulting in unstable product quality.
As an upgraded equipment of the friction press, in the fields of hot forging and refractory material forming processing, two types of electric screw presses, switched reluctance screw presses and servo screw presses, have appeared on the market one after another according to the different drive motors.
After the servo screw press starts the machine, as long as the control voltage is lost, the motor will stop immediately, so the power consumption of the press outside the striking action is almost negligible, which saves about 60% of power compared with the friction press. In addition, due to the superior performance of the servo motor, the servo screw press runs more smoothly and accurately, and can achieve rapid striking within an ultra-short stroke.
In terms of existing servo-driven electric screw press products, there are PZS servo presses from Wanjiaton, SPR servo presses from Lasco, ES servo presses from Enoki, and HLDS servo presses from Hualong. Among them, the domestically produced Hualong HLDS servo presses are used in the following fields:
1. Refractory industry: forming of refractory bricks, special-shaped refractory bricks and refractory balls.
2. Automobile industry: press-fitting of engine components (cylinder heads, cylinder liners, oil seals, etc.), press-fitting of steering gear components (gears, pins, etc.), press-fitting of transmission shaft components, press-fitting of gearbox components, brake disc components, etc.
3. Motor industry: press-fitting of micro-motor components (spindle, housing, etc.) motor components (bearings, spindles, etc.).
4. Electronics industry: press-fitting of circuit board components (plug-ins, etc.), electronic components.
5. Home appliance industry: home appliance accessories, home appliance accessories riveting, etc.
6. Machinery industry: mechanical parts, automated assembly lines, life testing of vulnerable parts, etc.
3. Servo hydraulic press
The servo hydraulic press uses a servo motor to drive the main transmission oil pump, reduce the control valve circuit, and control the hydraulic press slide. It is suitable for stamping, die forging, press-fitting, straightening and other processes. Compared with ordinary hydraulic presses, servo-driven hydraulic presses have the advantages of energy saving, low noise, high efficiency, good flexibility, and high efficiency, and can replace most existing ordinary hydraulic presses.
In terms of existing servo hydraulic press products, industrially developed countries such as Japan and Europe have conducted research and development earlier, and have gradually entered the popularization period in Japan. However, only a few domestic companies have carried out research on such products, and the main key technologies have not yet been broken through, and mature products have not yet been formed.