The fault curve can conceptually represent the relationship between the failure rate of CNC machine tool processing and time. Because this curve is shaped, it is often called "bathtub curve". It divides the service life of CNC machine tools into three stages, that is, early failure period, accident failure period and loss failure period. In the early stages of failure, the machine tool fault rate was negative index curve function.
At the beginning, the failure rate was very high, but as the operating time increased, the failure rate decreased rapidly, and the failure rate entered the constant stage of the failure rate. There are many reasons for the high early failure rate, such as design defects, manufacturing and installation errors, and hardware parts processing operations and use errors. After finding and finding the cause of the fault and eliminating, the fault rate will gradually stabilize. This stage is called the debugging period or running -in period.
The early failure period not only occurred in the initial stage of the new machine tools, but also occurred in the repair or replacement of parts processing parts of CNC lathe.
The occasional failure period is also called effective failure period, the failure efficiency is very low, and the failure efficiency is constant. Under normal circumstances, this stage should not lead to major failures, which is a good working period with a good hardware part. However, due to improper use, misunderstanding, or other accidents, some failures may also be caused. In addition, if the design stability coefficient of some components is small and the upper limit of the load is encountered during use, it may cause damage and failure due to overload. Therefore, pay special attention to reasonable use, strengthen maintenance, avoid operational errors, and extend the effective life of the machine tool as much as possible during the accident failure stage.
After entering the effect of grinding loss, due to the normal wear, chemical corrosion, changes in physical electrical performance, and material fatigue of the machine tool parts, the failure rate has risen again. For CNC machine tools, if you can adopt various diagnostic technologies, master the loss of parts, and take corresponding maintenance or replacement measures before parts enter the failure loss, you can control the occurrence of loss failure, thereby extending the actual actual CNC machine tools life.
