Correct operation steps for CNC machine repair:
I. Overview:
The maintenance concept of CNC machine tools cannot be limited to the failure of the CNC system. How to eliminate faults and repair in time, so that the CNC system can be put into use as soon as possible, and should also include proper use and daily maintenance.
Second, the steps to operate and use the CNC system correctly:
1. Check before the CNC system is energized:
1) Check if the individual printed circuit boards in the CNC unit are tight and the plugs are loose.
2) Carefully check that all the connecting cables between the CNC unit and the outside world are correctly and reliably connected as specified in the supplied connection manual.
3) Whether the connection of the AC input power supply meets the requirements specified by the CNC device.
4) Confirm that the various hardware settings in the CNC device meet the requirements of the CNC device. Only after the above inspection can the CNC device be put into operation.
2. Check after the CNC system is powered on:
1) First check if the fans in the CNC are operating normally.
2) Check if the DC power supply on each printed circuit or module is normal and within the allowable fluctuation range.
3) Further confirm various parameters of the CNC device.
4) When the numerical control device is connected to the machine tool, the inlet pump should be ready to press the emergency stop button while the power is turned on, in case the emergency is cut off at any time.
5) Manually move each axis at a low speed to see if the display of the machine movement direction is correct.
6) Perform several actions to return to the machine reference point to check whether the CNC machine has the function of returning to the reference point and whether the position of each return to the reference point is exactly the same.
7) Functional test of the CNC device.
Third, the commonly used CNC machine tool maintenance methods:
CNC equipment maintenance is a very complicated and high-tech work. CNC equipment is quite different from ordinary equipment.
1, using the self-diagnosis function of the CNC system
The general CNC system has a relatively complete self-diagnosis system. Whether it is a FANUC system or a Siemens system, the CNC system can make a certain range of self-diagnosis for itself or the interface during power-on initialization or operation. Maintenance personnel should be familiar with the system self-diagnosis of various alarm information. According to the specification, the fault range is determined to locate the faulty components. For the imported CNC system, the board level can only be positioned to the board level. The chip level maintenance can generally rely on the after-sales maintenance department of each CNC system.
2, using the logic of the PLC program to find
Now the general CNC control system has a PLC controller, mostly built-in PLC control. The maintenance personnel should analyze the machine control electric appliance according to the ladder diagram, and visually see the state of the CNC system I/O on the CRT. Through the logic analysis of the PLC program, the imported pump conveniently checks the location of the problem, such as the self-diagnosis page in the FANUC-OT system. According to the drawing PLC ladder diagram, the interface between the machine tool and the CNC system is faulty to determine whether the fault location is mechanical, electrical, hydraulic or pneumatic.
3. Communicate fully with the operators on the spot
The field operator is the closest partner of CNC machine tools, and the operator is also the first discoverer of various faults. Therefore, after the fault occurs, the maintenance personnel should generally not rush to start, fully communicate with the operator first, and carefully inquire about the working state, the form of the machine, the consequences, whether it is a misoperation, the fault can be caused when the fault occurs. No reproduction, etc., which helps maintenance personnel to quickly analyze and determine the cause of the failure.
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