Fault Curve and Characteristics of CNC Machining

The fault curve refers to the relationship between the failure rate and the time of CNC machining. Because the relationship between the shape of the shape of the bath-shaped, so called bathtub curve. In the process of processing is divided into three stages: the early fault period, the occasional fault period and loss of failure period.

The failure rate of the machine in the early fault period shows the change of the negative exponential curve function. At the beginning, the failure rate is very high, but with the increase of the running time, the failure rate is quickly reduced and enters the constant failure rate stage. There are many causes of early failure, design defects, manufacturing and installation errors, machining operations of metal parts and errors in use.

The occasional fault period is also known as the effective fault period, this stage has the lowest failure rate and the failure rate is constant. Under normal circumstances, this stage should not be the main failure of the metal parts processing is the best working period. However, due to improper use, operational errors or other accidental reasons, can also cause some failure. If some parts of the design of the safety factor is small, in the use of the load encountered in the upper limit, there may be damaged due to overload, failure. Therefore, in the occasional failure stage should pay special attention to reasonable use, to strengthen maintenance, to avoid operational errors, as far as possible to extend the useful life of the machine.

After entering the loss failure period, the failure rate increases due to the normal wear and tear of the machine tool parts, chemical corrosion, physical and electrical performance changes, and the fatigue of the material. For CNC machine tools, such as the use of a variety of diagnostic techniques to master the loss of parts of the law, in the parts into the fault before the loss period to take appropriate maintenance or replacement measures, will be able to control the occurrence of loss of failure, thus extending the equipment NC processing Actual life expectancy.

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