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Tell me about precision machining!

Release time:

2023-02-13 00:00

CNC machine tools in the batch processing of precision mechanical parts, especially pay attention to the accuracy of processing. To ensure the accuracy of the batch processing we should pay attention to what problems?

The poor machining accuracy of 1. batch parts is generally due to the fact that the feed dynamics between the axes are not adjusted according to the error during installation and adjustment. Or due to the use of wear and tear, the machine tool axis transmission chain has changed, can be re-adjusted and modify the amount of gap compensation to solve.

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 good, and whether the position feedback cable connector is in good contact. Whether the corresponding analog output latch and gain potentiometer are in good condition, and whether the corresponding servo drive device is normal.

2. the machine tool movement overshoot caused by poor machining accuracy, may be plus, deceleration time is too short, can be appropriate to extend the speed change time. It is also possible 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.

Roundness out of tolerance when 3. two-axis linkage

(1) Axial deformation of a circle

This deformation may be caused by the mechanical adjustment, and the positioning accuracy of the shaft is not good. Or lead screw clearance compensation is improper, will lead to over-the-limit roundness error.

(2) Oblique ellipse error

At this time, 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 it. Then, check whether the interface board of the resolver or induction synchronizer is adjusted properly, and then check whether the gap of the mechanical transmission pair is too large and whether the gap compensation is appropriate.

Non-standard precision parts processing with high precision requirements

The precision of non-standard precision parts processing mentioned here must be processed in strict accordance with additional drawings, and the processing size is within the allowable range of error. Therefore, the requirement of processing precision parts is to process in strict accordance with the theoretical size.

For precision parts processing is mainly the size of the requirements, such as cylindrical diameter is how much, there are strict requirements. The positive and negative errors are qualified parts within the specified requirements, otherwise they are unqualified parts. The length, width and height also have specific and strict requirements, and the positive and negative errors are also stipulated. For example, if the diameter of an embedded cylinder is too large to exceed the allowable range of the error, it will cause the situation that it cannot be inserted. If the actual diameter is too small and exceeds the lower limit of the allowable negative value of the error, it will cause the insertion to be too loose and not firm.

These are unqualified products, it is necessary to scrap or re-processing, which will inevitably lead to an increase in costs, therefore, to ensure the accuracy of non-standard precision parts processing is very important.

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