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.
考虑该零件表面结构的不规则性但有较高精度的孔需要加工，定位基准选择“一面双孔”是最佳的方法。
Consider to the irregularity components but have high accuracy holes to be processing. So, "two holes at a face" is the best localization plan.
本文通过对工件在数控铣床、加工中心上装夹定位基准选择及定位基准原则的阐述。为我们在加工中工件的定位提供了理论基础及实践依据；
The paper elaborates the norm choice of workpiece loading positioning at milling machines and the processing center, which provides the theoretical and practice basis for the positioning of workpiece.
本文着重探讨工件的定位方法、定位形式和定位基准的选择。
The article lays stress on discussing the choice of the locating methods, the locating styles and the locating datum for the workpiece.
精基准选择：要符合基准重合原则，尽可能选设计基准或装配基准作为定位基准。
Fine datum choice: Must conform to the datum superposition principle, chooses the design datum or the assembly datum as far as possible takes the localization datum.
精基准选择：要符合基准重合原则，尽可能选设计基准或装配基准作为定位基准。
Fine datum choice: Must conform to the datum superposition principle, chooses the design datum or the assembly datum as far as possible takes the localization datum.
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