Self failure of CNC machine tool. The occurrence of this kind of fault is caused by the CNC machine tool itself, which has nothing to do with the external use environmental conditions. Most of the faults of the CNC machine tool belong to this kind of fault.
External failure of CNC machine tool. This kind of fault is caused by external reasons, such as low and high power supply voltage and excessive voltage fluctuation; The phase sequence of the power supply is incorrect or the three-phase input voltage is unstable, and the ambient temperature is too high; Invasion of harmful gas, moisture and dust; External vibration and interference are the causes of the fault.
In addition, human factors are also one of the external causes of CNC machine tool failure. Due to unskilled operation, the external faults caused by improper operation account for more than one third of the total faults of the CNC machine tool in the first year of use.
In addition to the above common fault classification methods, there are many other different classification methods. For example, according to whether the fault is destructive when it occurs, it can be divided into destructive fault and non-destructive fault; According to the specific functional parts where the fault occurs and needs to be repaired, it can be divided into numerical control device fault, feed servo system fault, spindle drive system fault and automatic tool change system fault, etc.
