矿用圆环链编链工艺的角度过程能力指数

Process capability indices for angles in the weaving process of steel chains for mining

将过程能力指数的概念扩展到角度质量控制问题,给出角度过程能力指数的计算方法.研究26×92矿用圆环链服从VonMises分布的弯曲点角度质量特性值当分布中心与公差中心重合时,使角度过程能力指数达到适宜的尺度参数的合理取值范围为[3 39,4 40].导出分布中心在偏离公差中心的情况下,为使角度过程能力指数取得适宜值,分布中心对于公差中心偏离的合理范围的公式.

By applying process capability indices (PCI) in angle quality control, a way of calculating PCI for angles is presented. Use model 26×92 steel chains for mining as the object of our study. Angle quality characteristics of the bending point of this model have a Von Mises distribution. The rational range of scale parameter value is deduced as on the condition that the distribution center of angle quality characteristics of the bending point coincides with the tolerance center of angle quality characteristics of the bending point. On the condition that the distribution center does not coincide with the tolerance center, we deduce the formula of calculating the rational deviation of the distribution center from the tolerance center for getting the value of PCI for angles within the limits.