简化的测量过程统计控制方法

休哈特控制图平均值控制界限的设置对于计量标准或测量设备来说有很大的局限性,根据计量标准或测量设备的特点,提出简化的测量过程统计控制方法,该方法省去了标准偏差或极差控制图。根据标准偏差试验结果的大小,提出了子组最少测量次数的确定方法,平均值控制界限以各组平均值算得的标准偏差来设置,平均值控制图异常的判断准则简化为3种判据,进而大大减少了实施统计控制的工作量,便于推广应用。

The Statistical Control Methods of the Simplified Measurement Process

The set-up of Shewhart control charts control limits of average value has greater limitation for measurement standards or measuring equipments. According to the characteristic of measurement standards or measuring equipments, a simplified statistical control method is proposed. It omits the standard deviation control chart or R control chart.According to the values of standard cleviation of testing results, it provides the method to determine minimum measurement times for sub-group and the control limits of average value can set-up with standard deviation of all sub-group average values.Otherwise,it also provides the judging criterion of abnormality of average value control chart which can be simplified to three types, that reduces the workload of statistical control greatly and advantages to the popularity for measurement process statistical control method.