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What should be noted when precision machining

September 28, 2022

CNC machine tools in the batch processing of precision mechanical parts, especially to pay attention to the accuracy of processing, then precision machinery plus the public should pay attention to what problems? The following three aspects by the editor to introduce to you from the following.


A, batch parts processing accuracy is poor, generally due to the installation and adjustment, the feed dynamic between the axes according to the error is not well adjusted, or due to the use of wear and tear, the machine tool shaft drive chain has changed. Can be re-adjusted and modify the amount of clearance compensation to solve.

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When the dynamic tracking error is too large and alarm, you can check: whether the servo motor speed is too high. 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. The corresponding servo drive device is normal.


Second, the machine tool movement overshoot caused by processing accuracy is not good, may be acceleration and deceleration time is too short, can be appropriate to extend the speed change time. May also be a loose connection between the servo motor and the screw or rigidity is too poor, can be appropriate to reduce the position of the ring gain.

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Third, the roundness of the two axes linkage exceeds the difference


(1) Axial deformation of the circle


This deformation may be caused by the machinery is not well adjusted. Poor positioning accuracy of the axis or improper compensation of the screw gap can lead to circularity error when over quadrant.


(2) Oblique ellipse error


In this case, the position deviation value of each axis should be checked first. If the deviation is too large, the position ring gain can be adjusted to exclude. Then check whether the interface plate of the resolver or induction synchronizer is well adjusted, and then check whether the mechanical transmission sub-gap is too large and whether the gap compensation is appropriate.