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Photocoupler
1. The orientation of the spindle of a CNC machine tool machining center is usually in three ways, magnetic sensor, encoder and mechanical orientation. When using magnetic sensors and encoders, in addition to adjusting the position of the components, the machine parameters can be adjusted. When there is a directional error, there is almost no alarm, and it can only be discovered when an interruption occurs during the tool change.
2. Fault phenomenon: Once there was a fault in the orientation of a modified machining center, the machine tool often broke during the work at the beginning, but the number of occurrences was not many. It could work again after restarting, and the fault occurred repeatedly. .
3, the cause of the failure: After the fault occurred, the machine was carefully observed, only to find that the real cause of the fault is the positional shift of the spindle after orientation. The strange thing is that the spindle is touched by hand after orientation (and at work) When the tool is changed, the tool is inserted into the spindle. The spindle will drift in the opposite direction. Check the electrical part without any alarm, and the mechanical part is very simple. The orientation of the machine tool uses an encoder, so from the point of view of the phenomenon of failure and the possible occurrence, the possibility of the electrical part is relatively small, and the most important thing in the machine is the connection.
4. Fault handling: Therefore, it is decided to check the mechanical coupling part. When checking the coupling of the encoder, it is found that the set screw of the coupling sleeve on the encoder is loose, so that the coupling sleeve is retracted and the gap between the coupling portion and the main shaft is too large to make the rotation unsynchronized. After the set screw is fixed as required, the fault is eliminated.
5 Summary: The failure of the spindle orientation should be analyzed and processed according to the specific structure of the machine tool. Check the electrical part first, and then consider the mechanical part after confirming the normal.
