Summary of fault diagnosis methods for CNC drilling machines

What are the diagnostic methods of CNC drilling machine fault? I hope to help you find the cause of the fault as soon as possible to solve the problem!

I. System self-diagnosis method

Self-diagnosis and testing of the key hardware and control software of the system by using the internal self-diagnosis program or special diagnostic software, mainly including startup self-diagnosis, online monitoring and offline testing. Using the self-diagnosis function of the system, the signal status of the interface between the system and each part is displayed, and the approximate location of the fault is found out. It is one of the common methods in the process of fault diagnosis.

Second, sensory examination

1, visual: overall check whether the working state of each part of the drill machine is in a normal state (such as the axis position, spindle status, tool library, manipulator position, etc.), each electronic control device (such as numerical control system, temperature control device, lubrication device, etc.) there is no alarm indication; Local check whether there is insurance burned, components burnt, cracked, wire and cable off, and the position of each operating element is correct.

2, inquiry: To the fault site personnel carefully ask the process of the fault, the fault phenomenon and the fault consequences, the abnormality of the drill machine when starting, compare the accuracy and change of the workpiece before and after the fault.

3. Listen and smell: listen to whether the power transformer, impedance converter and reactor vibrate due to the loose iron core and emit a "squeak" sound, whether the relay and contactor have abnormal sounds, whether the servo motor, gas control and liquid control have abnormal sounds; Whether to smell some smoke, burnt gas and other odor.

4, touch: under the condition of the whole machine power off, you can find the cause of possible failure by touching the installation status of the main circuit board, the plug-in status of the plug seat, the connection status of the power and signal wires.

Third, parameter detection method

Drilling machine parameters are the prerequisite to ensure the normal operation of the machine tool, the change of system parameters will directly affect the performance of the machine tool, and even make the drilling machine failure, resulting in the machine can not work normally. Parameters are usually stored in the system memory, once the battery is insufficient or subjected to external interference, it may cause some parameters to be lost or changed, so that the drill press can not work normally. By checking and adjusting the parameters, sometimes the fault can be quickly eliminated, especially for the drilling machine is not used for a long time, and the phenomenon of parameter loss often occurs. Checking and restoring machine parameters is one of the effective methods in maintenance.

Four, the initial reset method

Under normal circumstances, the system alarm caused by instantaneous failure can be cleared by hardware reset or switching the system power supply. If the working storage area is damaged due to power failure, faulty system software, or battery undervoltage, you need to initialize and clear the system. Back up data before deleting the storage area. If the fault persists after initialization, perform hardware diagnosis

System data initialization includes system parameter initialization, spindle parameter initialization, servo parameter initialization. To initialize system parameters, clear all SRAM data. When the system is powered on, press the RE? SET "and" DELET "two keys, and then the prior backup of the machine data back. The main shaft parameter initialization process is to restore the motor parameters to the factory values from the main shaft module. The servo parameter initialization processing method is to set all the servo function parameters to "0" in the servo setting screen, and then power off the system and power on again.

Five, I/O interface signal inspection method

Interface is an important channel of information, through I/O signal status diagnosis, determine the fault location and analyze the fault cause is one of the most used methods in maintenance. Taking the FANUC system as an example, the system provides the interface I/O signal state between the system and the drilling machine, the interface I/O signal state between the PLC and the CNC device, and the interface I/O signal state between the PLC and the machine tool, that is, the status display of the LCD screen can be used to check whether the CNC system will input the signal to the drilling machine. Or whether the switch signals triggered by various switches on and off on the drilling machine side are correctly input into the numerical control system as required.