In the detection of small apertures and small tolerances (mainlyH7Level tolerance and below) detection, the common way is to use plug gauge detection, but because this type of plug gauge due to the small design tolerance range, the use of plug gauge detection method, there will be the following drawbacks:
    1The production cost of plug gauge is high
    According to the data analysis of the tool shop and the industry, only the plug gauge tolerance is greater than0.003mmWhen the plug gauge can be guaranteed95%The above product pass rate; When less than0.0015mmWhen only guaranteed33%The pass rate of; When less than0.0025mmAnd greater than0.0015mmWhen only guaranteed67%The pass rate of.
    2High cost of use
    The difference between the lower difference of the pass end and the wear limit is the wear amount. The smaller the wear amount, the shorter the service life of the plug gauge.
    3Measurement difficulty
    According to the feedback of the measuring room, due to the design tolerance range is too small, about0.014mmAround, the processing is difficult, the accurate value can not be read, the measurement and testing can not be guaranteed, and the acceptance rate is low.
    4Product processing is difficult

    Because the plug gauge eats a part of the tolerance required by the product, the product is compressed into the middle difference of the required size of the product diagram during processing, and the processing requirements are correspondingly increased.

    So, in the case that the plug gauge can not meet the needs of detection, how should the new detection means be selected? In view of the above drawbacks, the next edition will sort out several schemes for your reference.

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