Talk about precision parts processing, batch parts processing skills you should know

by:NJPE     2020-01-21
CNC processing plants should pay special attention to the machining accuracy when processing precision parts in batches. What problems should we pay attention to when ensuring the accuracy and batch machining? The following is introduced by our NJPE precision technicians from the following three aspects: first, the processing precision of batch precision parts is poor, generally due to installation adjustment, the feed dynamics between each shaft is not adjusted according to the error, or the transmission chain of each shaft of the machine tool changes due to wear and tear. It can be solved by re-adjusting and modifying the gap compensation amount. When the dynamic tracking error is too large and alarm, check whether the servo motor speed is too high. Whether the position detection element is in good condition. Whether the position feedback cable connector is in good contact. Whether the corresponding analog output latch and gain potentiometer are in good condition. Whether the corresponding servo drive device is normal. Second, the overshoot of the machine tool movement causes poor machining accuracy, which may be that the acceleration and deceleration time is too short, and the speed change time can be appropriately prolonged. It is also possible that the connection between the servo motor and the lead screw is loose or the rigidity is too poor, so the gain of the position ring can be appropriately reduced. Third, the roundness of the two-axis linkage is out of tolerance (1) The axial deformation of the circle may be caused by mechanical unadjustment when precision parts are processed. The positioning accuracy of the shaft is not good, or the lead screw gap compensation is improper, which will lead to roundness error when the image is over. (2) Oblique ellipse error, at this time should first check the position deviation value of each axis. 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 transformer or inductosyn is properly adjusted, and then check whether the gap of the mechanical transmission pair is too large and whether the gap compensation is appropriate.
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