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Fault Curve And Characteristics Of NC Machine Tool Machining

May 25, 2017

 CNC Machining CNC machine tool processing fault curve and characteristics of the fault curve can be conceptual representation of CNC machine tool processing failure rate and the relationship between time. As the shape of the curve was bathtub-shaped, it is often referred to as "bathtub curve." It will be the use of CNC machine tools into three stages, namely, early failure period, occasional failure period and loss of failure period.

  CNC Machining In the early failure period, the failure rate of the machine has a negative exponential curve function. At the beginning, the failure rate is very high. However, with the increase of running time, the failure rate is reduced and the failure rate is constant. There are many reasons for the high early failure rate, such as design flaws, errors in manufacturing and installation, machining of metal parts, and errors in use. After running and running to identify the cause of the malfunction, and be excluded, the failure rate will gradually stabilize. This stage is called a trial run or a running period.

  The early failure period occurs not only in the early stages of the new machine, but also when the machine parts are repaired or replaced and re-used.

  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 unexpected reasons, can also cause some failure. In addition, if some parts of the design of the safety factor is small, in the use of the load encountered 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.

  CNC Machining 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 its 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