控制图. 第8部分: 小批量生产和少量混合批次的制图技术

[中文适用范围]： 本文档描述了将常规变量控制图应用于小批量生产和小批量混合批次的方法，其中监控样本大小仅限于 1 个。 它提供了一组工具来促进对此类流程中变异来源的理解，以便更好地管理流程。 所描述的图表以流程为中心，而不是以产品为中心。 用户可以在单个控制图上绘制、监视和控制不同项目的相似特征，或一个项目的不同特征。 注 1：术语“小批量”和“小批量”没有明确定义。 这里，小批量和小批量是指在生产不同的产品之前仅制造少数产品。 注 2：对于子组大小大于 1 的情况，适用其他标准。 [外文原描述]： ISO 7870-8:2017 describes ways of applying regular variables control charts to short runs and small mixed batches where the sample size for monitoring is restricted to one. It provides a set of tools to facilitate the understanding of sources of variation in such processes so that the processes can be better managed. The charts described are process-focused rather than product-focused. The user can plot, monitor and control similar characteristics on different items, or different characteristics on an item, on a single control chart. NOTE 1 The terms short run and small batch size are not well defined. Here, short run and small batch size are taken to mean only a few items are manufactured before a different item is then produced. NOTE 2 For situations where the subgroup size is larger than one, other standards apply.