超硬刀具复合片合成产品检验抽样方法探讨

Discussions on Sampling Inspection of Superhard Composites for Tools

因超硬刀具复合片具有高价值,常用于汽车及工程机械等高端制造业领域,因此使用商对复合片性能的稳定性要求很高,希望产品100%检验。复合片产品质量主要取决于合成工序质量。然而表征合成工序质量的指标很多,有些指标能进行100%检验,而大多数指标的检验是破坏性的,不能实现100%检验,只能进行抽检。为使抽取的复合片样品质量能较好地代表整批质量,选择合适的随机数获取方法及样品抽取方法是必要的。随机数表法具有生成随机数精度高,获取效率高等特点,适用于复合片所有表征指标检验样品获取。在批量较小或者总体各组成部分比较均匀时,宜采用简单随机抽样方法获取检测样品,否则应采用分层随机抽样方法获取检测样品。

With the high value,tools of superhard composites are often applied to high-end industries such as automobile and engineering machinery.And costumers have a high requirements on the stability of the composites and expect that the products be 100% inspected.Quality of the composites are mainly determined by the quality of sintering process.However there are many indexes of indicating quality of the sintering process,some can be 100%inspected,but some（those destructive ones）can not,which could be inspected only by sampling.To make sure that the quality of samples can reflect the batch quality well,it is necessary to choose a proper random sampling procedure.The procedure of random number table must be listed as the priority for its precision and high efficiency,and it＇s suitable for all indexes of composites sintering process.For occasions of small lots or even composites,simple random sampling procedure should be used;otherwise,the stratified simple random sampling procedure should be applied.