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First, the formation of abnormal processing accuracy of the reasons

The formation of processing accuracy of the causes of abnormal problems hidden strong, relatively difficult to diagnose, summed up the five main reasons: machine feed unit was changed or changed; machine axis offset of each axis anomalies; axial reverse anomalies; motor Abnormal operation, that is, electrical and control part of the abnormal; mechanical problems, such as screw, bearings, shaft and other components. In addition the preparation of processing procedures, tool selection and human factors, may also lead to abnormal processing accuracy.

Second, CNC machine tool diagnosis criteria

1. After the first external CNC machine tools is a mechanical, hydraulic, electrical as one of the machine, so the onset of the problem will be reflected by the three summarized. Patch personnel should be first by the outside of one by one investigation, try to prevent random unsealed, open, otherwise it will expand the problem, so that machine tool loss accuracy, decline function.

2. After the first electrical machinery in general, mechanical problems easier to find, and the diagnosis of CNC system problems are more difficult. Before the maintenance of the problem, the first attention to remove mechanical problems, often can be achieved with less effort.

3. After the first static in the machine before the termination of power failure, through understanding, investigation, testing, analysis, do not think that non-destructive problems before the machine can be powered; in the operating conditions, the dynamic investigation, Check and test, find fault. While the destruction of the problem, you must first remove the risk before they can power.

4. After the first trash when the emergence of a variety of problems are intertwined with each other, sometimes unable to start, you should first deal with simple questions, post-processing more difficult problems. Often simple problem handling, the problem of difficulty may also become simple.

1. Inspector: (see Wen Wen cut) asked - machine problems, processing status, etc .; see-CRT alarm information, alarm indicators, capacitors and other components of the deformation of the smoked charred, protector tripping; - electrical components and other odor odor; touch - heat, oscillation, poor contact and so on.

2. Parameter view method: parameters are usually stored in the RAM, and sometimes the battery voltage is insufficient, the system for a long time without power or external interference will make the parameters lost or disorder, according to the characteristics of the problem, view and correct the parameters.

3. Isolation: some problems, it is difficult to distinguish between the NC part, or the servo system or mechanical part of the formation, often use isolation method.

4. The same type of swap with the function of the standby plate to replace the template is suspected to have problems, or function with the same template or unit exchange.

5. Utility test method G, M, S, T, function of all the instructions to prepare some small procedures, in the diagnosis of problems when running these procedures, you can identify the lack of function.

Fourth, the processing accuracy of abnormal diagnosis and treatment examples

1. Mechanical problems lead to abnormal processing accuracy

Fault phenomenon: a SV-1000 vertical machining center, the choice of Frank system. In the processing of connecting rod mold process, suddenly found Z axis feed anomaly, the formation of at least 1mm cutting error (Z direction cut).

Fault diagnosis: the survey learned that the problem is suddenly attacked. Machine in the jog, in the manual input data operation under the operation of the normal axis, and return to the reference point normal, without any alarm, electrical control part of the possibility of hard to remove. Should be mainly on the following aspects to be viewed one by one.

In the jogging approach, repeat the movement Z axis, through the visual, touch, listen to the movement of its confirmed, found Z-movement noise anomalies, especially the fast jog, the noise becomes more significant. Discrimination, mechanical aspects may be dangerous.