This article mainly introduces some common faults that cannot be judged by ordinary diagnostic methods. It requires professional technicians to use sophisticated instruments to carry out high-precision qualitative or quantitative inspections and determinations through advanced detection methods, and to pass the faults. The analysis of the location and the data obtained by the instrument can get the cause of the failure, and finally determine the best maintenance method to be taken. Usually, the simple diagnosis method is used to first determine the current working state of the CNC machine tool, and then the cause of the failure and the best maintenance method are determined through the precise diagnosis method. cnc machine service 。

1 Crack monitoring
Crack monitoring mainly includes several methods such as resistance method, ultrasonic method, magnetic flaw detection method, and acoustic emission method. Due to the different properties of the materials used in the mechanical structure, the method of measuring cracks is also different. Observe the cracks and status of the internal body structure of the parts through monitoring. If some small cracks are not found in time, it will easily lead to some major accidents.

2 Oil analysis Oil analysis
is mainly to analyze the wear and tear of measuring parts. Atomic absorption spectrometer can be used to analyze the size, shape, composition and depth of various metal particles and foreign impurities in lubricating oil or hydraulic oil to determine the cause mechanism and the degree of wear on the pipeline components, and then Effectively grasp the wear of parts.

3 Noise monitoring
The main tools used in noise monitoring are noise measuring meters and sonic meters, etc. The main objects of measurement are machine tool gears and bearings. The signal changes during the operation of the machine are judged through monitoring, and the law of signal changes is summarized, combined with vibration And noise analysis and identification, determine the fault of gears and bearings. The degree of obstacles and maintenance methods. Before the measurement is carried out, the first step is to determine the intensity. If it is confirmed that there is an abnormality in the intensity, a quantitative analysis and determination should be done.

4 temperature detection
Temperature detection can mainly include two types: contact type and non-contact type. The main tools used in the contact type are thermometers, measuring patches, thermocouples, and thermal coatings that directly contact bearings, gearboxes, motors, etc., and directly measure the surface temperature. The non-contact type uses more advanced measuring instruments, mainly including Infrared thermometers, infrared scanners, infrared thermal imaging cameras, etc., can monitor the surface temperature of the object without touching the surface of the object, and the operation is flexible and simple, and the operation is highly precise. It is usually used for detection in the case of abnormal heat generation during the operation of the machine tool.

5 Vibration and wear detection
Through the vibrometer touring detector, some characteristic point sensors installed on the machine tool are detected, and characteristic data of specific measuring points on the machine tool are obtained, such as the displacement speed, the size of the total vibration level, the amplitude frequency and the acceleration, etc., so as to correct Fault diagnosis and monitoring.

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