定位基准选择正确与否，对于提高机械加工精度有着重要影响。
Whether the locating datum is chosen correctly or not influences the improvement of the machining precision greatly.
定位则需要定位基准，定位基准选择得是否合适，将直接影响零件的加工精度。
To locate, we need the locating criteria, whether a suitable locating criterion is chosen or not will directly influence the machining precision.
在分析箱体类零件典型定位方案的基础上，建立了定位基准选择的过程模型和综合评判模型。
Under the base of studying the typical location plans of prismatic parts, process model and fuzzy comprehensive evaluation model of location datum selection are established.
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