In order to ensure the reliability of CNC machine tools, the machine tool numerical control system generally adopts modular structure. The segmentation method is to divide the machine tool numerical control system into several large templates according to the functional structure. Such as SB722B bed, microcomputer system by STD bus 16K byte memory template; 64 line parallel interface board; photoelectric isolation switch input board; photoelectric isolation switch power amplifier output board; power board.
When the CNC machine tool fails, according to the fault phenomenon, the modules that are not related to the fault phenomenon are eliminated one by one, and a small number of modules related to the fault are left, and then further divided according to the fault phenomenon and the fault mechanism until the fault range is narrowed down to a template. Within this time, the replacement method can be used to replace the fault.
If there is no spare part replacement, this idea can be combined with the structural principle and electronic technical knowledge of the module to continue to divide to the point where the fault occurred, and finally determine the fault point with other necessary checks. Using the segmentation method allows us to always target the failure. At the same time, because each module is connected through the bus and the connection socket, the inspection is convenient.
The reasoning method is to test and check some key points or joint parts of the machine tool according to the machine fault phenomenon, and use the measured data analysis circuit to determine the fault location.
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