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What are the methods for abnormal diagnosis and processing of CNC machine tools?
In the process of using CNC machine tools, the machining accuracy of CNC machine tools is often abnormal, and these abnormal concealment is very strong, which makes it difficult for workers to diagnose. In this paper, the reasons for the emergence of some precision anomalies and the diagnosis methods are listed, so that we have a certain understanding of this.
In production, the most common abnormality of precision has the following aspects:
(1) the feed unit of the machine tool has been changed or changed.
(2) the offset of each axle part of the machine tool is abnormal.
(3) abnormal backlash of the axis.
(4) the operating state of the electrode (Electrical and control part) is abnormal.
(5) mechanical (screw, bearing, shaft connector and other parts) failure.
(6) the human factors of processing programming and cutting tool selection.
Diagnosis and treatment of abnormal machining precision of NC machine tool
1. change or change of system parameters
The system parameters of the machine tool include machine tool feed unit, zero paranoid and reverse gap and so on. In the process of failure repair of machine tools, the offset and gap changes of the parts may be affected. Therefore, it needs to be adjusted and modified after the fault treatment is finished. On the other hand, the serious mechanical wear and loose connection may cause the change of the measured parameters, which need to be modified to meet the precision requirements. The disassembly examination may find that the bearing is damaged or the ball disengagement occurs, and the machine is replaced after the replacement of the machine.
2. abnormal machining precision caused by mechanical failure
There are three main reasons for the abnormal machining accuracy caused by machine tool failure: one is the abnormal motor, the two is the mechanical fault, and the three is the gap between the screw and the screw. If you want to further diagnose the fault further, you need to take off the motor and the screw. Motor and mechanical inspection is carried out. If the inspection result is normal running of motor, in the diagnosis of mechanical part, it is found that when hand screw is used to move the lead screw, there is a very clear sense of vacancy at the beginning of returning motion. In normal circumstances, it should be able to feel the orderly and smooth movement of the bearing.
3. electrical parameters of machine tool do not optimize motor operation abnormality
If the accuracy of the X axis is found in the process of processing, it is found that there is a gap in the X axis, and the instability occurs when the motor is started. There are two main reasons for this situation. First, the reverse clearance of the screw is larger, and the other is the abnormal working of the X axis electrode of the machine tool. The main solution is the adjustment of the degree motor. The existing gap is compensated, or the servo gain parameters and the pulse suppression function parameters are adjusted to eliminate the jitter of the X axis, and the precision is normal.