What is the reason for the deterioration of the precision of CNC machining in Dongguan?

1. Poor machining accuracy of parts

According to Dongguan CNC Machining Company, it is generally due to the fact that the feed dynamics between the axes have not been adjusted according to the error during installation and adjustment, or due to wear and tear, the transmission chain of each axis of the machine tool has changed (such as lead screw clearance, pitch error change , Axial movement, etc.). It can be solved by re-adjusting and modifying the clearance compensation amount. When the dynamic tracking error is too large and alarms, you can check: whether the servo motor speed 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 device is normal.

2. Overshoot during machine movement causes poor machining accuracy

The Dongguan CNC processing manufacturer analyzed that 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.

Third, the roundness of the two-axis linkage is out of tolerance

1. Axial deformation of a circle

This deformation may be caused by improper adjustment of the machine. Poor positioning accuracy of the shaft or improper compensation of the screw gap will cause roundness errors when crossing the quadrant.

2. Oblique ellipse error (ellipse in the direction of 45 degrees)

According to Dongguan CNC Machining Company, the position deviation value of each axis should be checked first. If the deviation is too large, adjust the position loop gain to eliminate it. Then check whether the interface board of the rotary drive or the induction synchronizer is adjusted well, 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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