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How to maintain common parts of vertical machining center in CNC precision machining plant?

December 23, 2022
How to maintain common parts of vertical machining center in CNC precision machining plant?
As a highly automated processing equipment, the vertical machining center of CNC precision machining plant will have failures of one kind or another when it is used for a long time or handled improperly, so it must be well maintained.
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1. Servo motor and spindle motor of vertical machining center
Servo motor and control system are the key components of machine tool power source and precision control, focusing on noise and temperature rise. If the noise or temperature rise is too large, find out whether it is a mechanical problem such as bearing or a matching amplifier parameter setting problem, and take corresponding measures to solve it. If the servo shaft makes abnormal noise during movement, it may be the mechanical noise caused by the lead screw, coupling and misalignment with the servo motor. The motor of the vertical machining center can be disconnected from the coupling and run separately. If the motor still has noise, adjust the speed loop gain and position loop gain appropriately to mute the motor. If there is no noise, it is judged that there is a problem with the concentricity of the screw rod and coupling. Recalibrate the concentricity, and then connect the motor, which can generally eliminate the problem.
 
2. Measurement feedback element of vertical machining center
Measuring feedback elements include encoder, grating ruler, etc. It is necessary to check and detect whether the connection of each element is loose and whether it is polluted by oil or dust. Dust and fine iron filings can damage these components.
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3. Electrical control part of vertical machining center
Frequently check whether the external three-phase power supply voltage connected to the machine tool is normal; Check whether the electrical components are well connected; Display the diagnostic screen with CRT and check whether various switches are effective; Check whether the relay and contactor work normally and whether the contact is good; Whether protective elements such as thermal relay and arc extinguisher are effective; Check whether the element temperature in the electric cabinet of the vertical machining center is too high. For poor contact of the contactor, the contactor can be disassembled, the high-temperature oxide on the surface of the contactor can be removed with a small file, and then the impurities can be wiped off with absorbent cotton and alcohol, reassembled, and the contact can be checked with a multimeter. Continuity test.
 
4. NC system control part of vertical machining center
The control system includes numerical control unit, power module, I/O interface, servo amplifier, spindle amplifier, operation panel, display, etc. The maintenance is mainly to check whether the relevant voltage value is within the CNC specified range of Dongguan CNC Precision Processing Factory; Whether the connection of electrical components is loose; Check whether the fans of each functional module operate normally, and remove the dust on the fan and dust screen.