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Fault Curve And Characteristics Of Precision Machining Parts For CNC Machine Tools
Jul 05, 2017

The fault curve can conceptually represent the relationship between the failure rate and the time of Precision Machining Parts of CNC machine tools. 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.

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 reasons for the high early failure rate, such as design defects, manufacturing and installation errors, hardware parts Precision Machining Parts operations and the use of errors. 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.

Early failure periods occur 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 is the best work of Precision Machining Parts. However, due to improper use, operational errors or other accidental reasons, can also cause some failure. In addition, if some parts of the design of the safety factor is small, the use of the load in the upper limit, there may be damaged due to overload, failure. Therefore, in the occasional failure stage should pay special attention to rational use, to strengthen maintenance, to avoid operational errors, as far as possible to extend the effective life of the machine.

After entering the loss 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 CNC Precision Machining Parts The actual life of the piece.

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