It is generally due to the fact that the feed dynamics between each axis is not adjusted according to the error during installation and adjustment, or due to the wear and tear of the machine tool, the transmission chain of each axis of the machine tool has changed (such as screw clearance, screw pitch error change, axial movement, etc. ). It can be solved by readjusting and modifying the clearance compensation amount.
When the dynamic tracking error is too large and an alarm occurs, you can check: whether the speed of the servo motor is too high; whether the position detection element is good; whether the position feedback cable connector is in good contact; whether the corresponding analog output latch and gain potentiometer are good; Whether the corresponding servo drive is normal.
2. Overshoot during machine tool movement causes poor machining accuracy
It may be that the acceleration and deceleration time is too short, and the speed change time can be appropriately extended; it may also be that the connection between the servo motor and the lead screw is loose or the rigidity is too poor, and the gain of the position loop can be appropriately reduced.
3. The roundness of the two-axis linkage during machining is out of tolerance
1. Axial deformation of a circle
This deformation may be caused by improper adjustment of the machine. The positioning accuracy of the axis is not good, or the compensation of the lead screw gap is not correct, which will lead to roundness errors when crossing the quadrant.
2. Oblique ellipse error (ellipse in the direction of 45 degrees)
At this time, the position deviation value of each axis should be checked first. If the deviation is too large, the position loop gain can be adjusted to eliminate it. Then check whether the interface board of the rotary drive or the induction synchronizer is adjusted properly, and then check whether the clearance of the mechanical transmission pair is too large and whether the clearance compensation is appropriate.
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