1. Fault diagnosis of CNC machine tools
The following principles should be mastered during fault diagnosis:
1.1 First outside, then inside
The reliability of modern CNC systems is getting higher and higher, and the failure rate of the CNC system itself is getting lower and lower, and most of the failures are caused by non-system itself. Since the CNC machine tool is a machine tool integrating mechanical, hydraulic and electrical, the occurrence of its failure will also be reflected by the three comprehensively. Maintenance personnel should first conduct investigations one by one from the outside to the inside. Try to avoid arbitrarily unpacking and disassembling, otherwise it will enlarge the fault, make the machine lose its precision and reduce its performance. The faults outside the system are mainly caused by problems with detection switches, hydraulic components, pneumatic components, electrical actuators, and mechanical devices.
1.2 Mechanical first, electrical
Generally speaking, mechanical faults are easier to detect, while the diagnosis of CNC system and electrical faults is more difficult. Before troubleshooting, first pay attention to eliminating mechanical faults.
1.3 First static and then dynamic
First, in the static state of the machine tool when the machine is powered off, through understanding, observation, testing, and analysis, it is confirmed that the machine tool will not be energized after the power is turned on. In the running state, conduct dynamic observation, inspection and testing to find faults. If a destructive failure occurs after power-on, the danger must be eliminated before power-on.
1.4 Simple first, then complex
When a variety of faults are intertwined and there is no way to start for a while, the easy problems should be solved first, and the more difficult ones should be solved later. Often after simple problems are solved, difficult problems may become easier.
2. Fault diagnosis technology of CNC machine tools
Numerical control system is a high-tech intensive product. If you want to quickly and accurately find out the cause and determine the location of its fault, you must rely on diagnostic technology. With the continuous development of microprocessors, diagnosis technology has also evolved from simple diagnosis to multi-functional advanced diagnosis or intelligence. The strength of the diagnostic ability is also an important index to evaluate the performance of the CNC numerical control system. The diagnostic techniques of various CNC systems currently in use can be roughly divided into the following categories: