First. Diagnosis of host failures There are many methods for diagnosing common small CNC lathe host failures, such as "modern diagnostic technology" using advanced testing methods and traditional "practical diagnostic technology".
1. Modern diagnostic technology: This diagnosis uses diagnostic equipment and data processing to measure certain characteristic parameters of machine tools, such as vibration, noise, and temperature. The measured values are compared with prescribed normal values to determine the mechanical device. Whether the working status of the device is normal, so as to predict and predict the operating status of the mechanical device, and further analyze the cause, location and severity of the failure of the mechanical device qualitatively and quantitatively. The use of modern diagnostic technology can detect the faulty parts in a timely manner at the early stage of the failure of the mechanical device and perform maintenance, thereby preventing further damage to the mechanical parts. Modern diagnostic technology has been continuously promoted and applied.
2. Practical diagnosis technology: This diagnosis is made by the maintenance personnel to diagnose the fault of the small CNC lathe through their own sense organs and experience. The diagnosis process using practical diagnosis technology varies according to the type of failure. There is no order in which the various methods can be interspersed or performed simultaneously. Comprehensive analysis should be performed to achieve better results. Practical diagnostic technology does not require complicated and expensive instruments, and can be diagnosed anytime, anywhere. It is fast, convenient, and highly accurate, and is especially suitable for preliminary diagnosis of machine tools.
Second, the diagnosis of electrical system faults: For the failure of the electrical system of small CNC lathes, the process of investigation, analysis and diagnosis of faults, that is, the process of troubleshooting, so the method of fault diagnosis is particularly important. Some common diagnostic methods are:
1. Intuitive method. Mainly adopt the methods of visual inspection, hand touch, and power on. The method that maintenance personnel first use in fault diagnosis is visual inspection. First, consult, and ask the site personnel who have the fault to consult the process, fault phenomenon and fault consequences of the fault in detail, and ask multiple times in the entire analysis and judgment process. The second is a careful inspection, which is carried out step by step from outside to inside according to the principle of fault diagnosis. Check the electrical control devices of the machine tool (such as lubrication device, numerical control system, temperature control device, etc.) for alarms, and check whether the working status of each part is normal (such as the position of the manipulator, the state of the spindle, the position of each coordinate axis, the tool magazine, etc.) The machine tool must observe whether there is a short circuit or an open circuit on the circuit board, whether there are cracks and burns on the circuit board components and circuits, and whether the chip has a bad contact. For the repaired circuit board, it is also necessary to check for missing parts and errors. And disconnection. The third is touch. When the machine is powered off, you can touch the installation status of each main circuit board, the connection status of each plug socket, the connection status of each power and signal wire (such as the servo and motor contactor wiring) Discover the cause of the possible failure.
2. Self-diagnostic function method. Using the self-diagnostic function of the CNC system, an alarm message is given to indicate the approximate cause of the failure.
3. Exchange method. Swap the same modules and units with each other and observe the failover situation to quickly determine the location of the failure.
4. Instrument measurement comparison method. When the system fails, conventional electrical testing equipment is used to measure the voltage, power supply, and pulse signals of the faulty part. Comparing the normal value with the value at the time of the fault, the cause and location of the fault can be analyzed.