在矿山设备维修中,相当多的配件是矿山自制加工的。如何在零部件加工中合理地选取加工公差,这是个带普遍性的问题。 如所周知,按照公差理论,在批量生产的前提下,加工件的公差值分布是符合正态分布曲线(高斯曲线)的(参见图2Ⅰ),其公差值分布概率最大的地方,是在正态分布曲线对称轴“y”上,而在设备修理中所用的本单位加工的配件,其误差分布由于以下两 In the mine equipment maintenance, a considerable number of accessories are mine self-processing. How to select the processing tolerance reasonably in the parts processing is a common problem. As we all know, in accordance with the theory of tolerance, under the premise of mass production, the tolerance distribution of the workpiece is in line with the normal distribution curve (Gaussian curve) (see Figure II), where the maximum probability distribution of tolerance values ​​is In the normal distribution curve symmetry axis “y”, and in the equipment used in the repair unit processing accessories, the error distribution due to the following two