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How to Judge the Performance of Servo Press?

Servo presses are composed of various elements such as pressurization system, force load of stamping process, drive system, auxiliary device for forming, lubrication system, etc., and these systems can be further refined into various parts.


1. Servo press pressurization system


The pressing mechanism of the servo press basically has a crankshaft type, a crankshaft-free type, a crankshaft + connecting rod, and a screw type, and the crankshaft type is mostly used. Due to the difference in the nominal force of the crankshaft, the size of the eccentricity in the form of the crankshaft is also different. This form takes advantage of the fact that the crankshaft bearing can be arranged closer to the crankshaft, which has the advantage of reducing bending deformation.


2. The rack of the parts bearing the load pressure of the stamping process of the servo press


The elongation of the press frame, the deflection deformation of the base and the slider, the deformation of the slider guide, the size of the opening on the base, and the thickness of the table all affect the performance of the servo press. Small elongation, small deflection, high rigidity of the slider guide, control of the base opening to the necessary minimum, and increasing the thickness of the table as much as possible are all very necessary for servo presses. These indicators are excellent, and the entire performance of the press can be fully utilized.


3. Servo press drive system


The drive system refers to the transmission system of the motor torque. The smaller the inertia, the better the performance. The smaller the gap between the rotary part and the sliding surface, the gap between the gear and the joint, the better the accuracy, and the less the wear and deterioration of the drive system. The materials used to make the components, as well as the implementation of appropriate heat treatment processes, high-precision machining, and strictly managed assembly, also determine the performance of the servo press. Of course, the influence of these factors is not limited to the drive system.


4. Auxiliary device system for servo press forming


Sometimes this happens, the die buffer device transfers the pressure from the buffer pad to the pressure plate of the die, and at least four ejector pins are used when deep drawing small parts. In the case of simple cylindrical deep drawing, the load acting on the four ejector pins is the same. In fact, due to the difference in the precision, rigidity and frame form of the press, the load on each ejector pin is different. is almost not under load, that is to say, in some cases, some ejector pins are vacant. When the load on the ejector pins is different, the compression deformation of each ejector pin will be different, and the balance of the pressure plate will change. During the stamping process, there is no abnormality in the action of the platen, but if several sensors are installed in different parts of the top plate, and the actual stamping operation is measured, it will be found that the platen is vibrating and beating, and there is almost no place in it. In a balanced state, the biggest cause of this phenomenon is the impact of the upper die on the pressing plate.


5. Servo press lubrication system


This is a common problem for all machines. To make machines with small clearances and heavy loads such as servo presses run smoothly and safely, not only clean lubrication is required, but sufficient cooling is also essential. The mechanical clearance is large, and it can run relatively briskly, but it cannot obtain the excellent precision that the servo press must achieve. In order to make the crankshaft run smoothly under load, the clearance between the crankshafts is also very important, which puts forward high requirements on the machining accuracy of the frame, that is, the technical level of machining. Of course this applies to all work machines.


It must be emphasized here that the lubrication system of the servo press must be much more demanding than the traditional ordinary press lubrication system. Otherwise, the actual functionality and convenience of the servo press will be lost. For example, the use of the free swing operation function of the servo press requires special lubrication methods for the crankshaft, gears, etc., which must be considered in advance in the design.



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