Talk about precision machining!
CNC machine tools in batch processing precision mechanical parts
CNC machine tools in batch processing precision mechanical parts, especially pay attention to the precision of processing. To ensure accuracy in batch processing what problems should we pay attention to?
First, the processing accuracy of batch parts is poor, generally due to the installation adjustment, the feed dynamic between the axes is not adjusted according to the error. Or due to the use of wear, the transmission chain of each shaft of the machine tool has changed, which can be solved by re-adjusting and modifying the gap compensation amount.
When the dynamic tracking error is too large and the alarm, you can check whether the servo motor speed is too high, whether the position detection element is good, and whether the position feedback cable connector is in good contact. Whether the corresponding analog output latch and gain potentiometer are good, and whether the corresponding servo drive device is normal.
Second, the machining accuracy is not good when the machine tool is overshoot, which 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 ring can be appropriately reduced.
Three, the roundness of the two axis linkage
(1) Axial deformation of the circle
This deformation may be caused by the mechanical adjustment, and the positioning accuracy of the shaft is not good. Or improper compensation of the lead screw gap will lead to roundness error when crossing the quadrant.
(2) Oblique ellipse error
At this time, the position deviation value of each shaft should be checked first, if the deviation is too large, the position ring gain can be adjusted to eliminate, and then check whether the interface board of the rotary transformer or induction synchronizer is adjusted well, and then check whether the mechanical transmission pair clearance is too large, and whether the gap compensation is suitable.
Non-standard precision parts machining has high precision requirements
The precision of the non-standard precision parts processing mentioned here must be processed in strict accordance with the additional drawings, and the processing size is qualified parts within the allowable range of error. Therefore, the requirements for processing precision parts are processed in strict accordance with the theoretical dimensions.
For precision parts processing is mainly dimensional requirements, such as the diameter of the cylinder, there are strict requirements. The positive and negative errors are within the specified requirements of qualified parts, otherwise they are unqualified parts. The length, width and height also have specific strict requirements, and the positive and negative errors are also specified, such as an embedded cylinder, if the diameter is too large, exceeding the allowed range of errors, it will cause no insertion. If the actual diameter is too small, it exceeds the lower limit of the allowable negative value of the error, it will cause the problem of inserting it too loose and not firm.
These are unqualified products, are to be scrapped or reprocessed, which will inevitably cause an increase in costs, therefore, to ensure the precision of non-standard precision parts processing is very important.
Keywords: Asahi exhibition, precision machining
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