special machine for servo gate valve Guide rail is the benchmark of the relative motion position of the main parts of the machine tool, and its accuracy directly affects the relative position relationship between the forming motion of the machine tool. The errors of machine tool guide rails mainly include the errors of straightness in horizontal plane and vertical plane. The parallelism error of the front and rear guide rails in the vertical plane. The research shows that the thermal deformation of the guide rail will lead to the uplift of the guide rail surface, the tilt of the guide rail and the deflection of the guide rail and the linear positioning error. The movement of the table on the guide rail after the thermal deformation will affect the relative position of the turning tool and the workpiece, thus affecting the accuracy of the lathe and the processing quality of the workpiece. The technical research in this area needs to be further in-depth.

1. Oscillation caused by closed-loop servo system: Some CNC servo systems use semi-closed-loop devices, and the full-closed-loop servo system must be adjusted on the premise of its local semi-closed-loop system without oscillation, so the two are much the same.

2. Reduce the gain of the position loop: there is a reference standard value in the servo system, and the oscillation can appropriately reduce the gain, but not too much, because the steady-state error of the system is required.

3. Reduce the load inertia ratio: the load inertia ratio is generally set at about 70% of the parameters shown when vibration occurs. If the fault cannot be eliminated, it is not appropriate to continue to reduce the parameter value.

4. Add the proportional calculus (PID): The proportional calculus is a multifunctional controller, it can not only effectively the current and voltage signal proportional gain, but also adjust the output signal lag into the lead problem, oscillation fault sometimes due to the output current and voltage lag into the lead situation, then you can adjust the output current and voltage phase through PID.

5.special machine for servo gate valve high frequency suppression function: The above discussion is about the parameter optimization method during low frequency oscillation, and sometimes the CNC system will produce high-frequency harmonics in the feedback signal due to some mechanical oscillation reasons, which makes the output torque is not constant. It creates vibrations. For this high frequency oscillation, a first-order low-pass filter can be added to the speed ring, that is, the torque filter.

The speed instruction and speed feedback signals are converted into torque signals by the speed controller, and the high frequency components of the torque signals are cut off by the first order filter, so as to obtain an effective torque control signal. By adjusting the parameters, the frequency above 100Hz generated by the machinery can be cut off, so as to eliminate the effect of high-frequency oscillation.

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