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以犁刀变速齿轮箱为例,对箱体安装平面的4个安装孔的位置精度提出了3种不同的标注方法,并利用基于CATIA的公差分析软件CETOL 6σ建立三维公差模型,对3种标注方法分别进行分析。利用尺寸精度控制成组孔的位置精度会造成累计误差;利用位置度控制成组孔的位置精度虽然避免了累计误差的产生,但是其公差取值较小,对成组孔的加工精度要求较高,不利于犁刀传动齿轮箱的加工装配;利用位置度并实行最大实体要求控制成组孔的位置精度能够保证零件的互换性,扩大位置度公差,提高合格率,降低成本,为产品的设计提供了一定的指导。
Taking the coulter gearbox as an example, three different annotation methods were proposed for the position accuracy of the four mounting holes in the mounting plane of the box, and a three-dimensional tolerance model was established by using CATIA-based tolerance analysis software CETOL 6σ. Methods were analyzed separately. The use of dimensional accuracy control group hole position accuracy will cause the cumulative error; the use of position control group hole position accuracy although avoids the cumulative error, but its tolerance is smaller, the processing requirements of the group of holes than High, which is not conducive to the processing and assembly of the gear box of the coulter; using the position degree and implementing the maximum physical requirements to control the position accuracy of the group of holes can ensure the interchangeability of parts, enlarge the position tolerance, increase the pass rate and reduce the cost, The design provides some guidance.