I. Composition of automatic transfer machine servo system

The servo system of automatic transfer machine is composed of servo circuit, servo drive device, mechanical transmission mechanism and executive parts. Its role is: to accept the feed speed and displacement command signal issued by the CNC system, by the servo drive circuit for a certain conversion and power amplification, through the servo drive device (stepper motor, DC servo motor, AC servo motor, etc.) and mechanical transmission mechanism, drive the machine table, spindle head frame and other executive parts, to achieve work feed and rapid movement. The CNC device is the "brain" of the automatic transfer machine to issue commands, while the servo system is the "limbs" of the automatic transfer machine, which is an executive mechanism that can accurately execute the motion instructions from the CNC device.

The servo system of automatic transfer machine is fundamentally different from the drive system of general machine tools. It can accurately control the motion speed and position of the executing parts according to the command signal, as well as the motion trajectory synthesized by the movement of several executing parts according to certain rules.

2. Requirements for the servo system

The servo system has the following requirements

1. High precision. automatic transfer machine Automatically processes according to the predetermined program. Therefore, in order to process high-precision and high-quality workpieces, the servo system itself should have high accuracy, generally to reach μm level.

2. Fast response speed. Fast response is one of the signs of dynamic quality of servo system. It requires that the following error of the following command signal is small, and the response is fast and the stability is good. That is, the system is required to reach or restore the original stable state in a short time after a given input, generally in 200ms, or even tens of milliseconds.

3. Wide speed range. Because the tool, workpiece material and processing requirements are different, to ensure that the automatic transfer machine can get the best cutting conditions in any case, the servo system must have enough speed range, which can meet the requirements of high-speed processing and low speed feed.

4. High reliability. automatic transfer machine operation rate is very high, often 24 hours continuous work, so it is required to work reliably. The reliability of the system is usually based on the average length of time between failures, that is, the average trouble-free time. The longer the time, the better.

5. High torque at low speed. automatic transfer machine is often heavy cutting at low speed, so it is required that the feed servo system has a large torque output at low speed to meet the requirements of cutting processing.

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