考虑零部件制造误差的精密主轴几何回转精度计算方法

发布时间：2018-05-17 09:48

本文选题：有向图 + 累积路径　；参考：《机械工程学报》2017年03期

【摘要】：提出一种通过精密主轴的结构及零部件制造误差预测其几何回转精度的计算方法。首先利用零部件之间的约束定位关系建立精密主轴的有向图模型,以此筛选出误差累积路径及关键公差;进而使用小位移旋量对各关键公差建模,通过齐次坐标变换的方法分析了4种主轴零件之间典型配合的误差传递过程;再将误差累积路径上的关键公差联系起来,得到主轴几何回转误差分析模型;在此基础上,结合蒙特卡洛模拟仿真方法,统计分析得到主轴几何回转精度的变动范围,得到其公差值;继而通过灵敏度分析,获得对各零件公差对回转精度的贡献度大小,为公差设计结果的改进提供依据。结果表明,该方法可以有效预测精密主轴的几何回转精度以及各零件公差对其影响程度。
[Abstract]:This paper presents a calculation method for predicting the geometric rotation accuracy of the precision spindle based on its structure and parts manufacturing error. Firstly, the directed graph model of the precision spindle is established by using the constraint positioning relation between parts, and the accumulated path and key tolerance of the precision spindle are screened out, and then the key tolerances are modeled by using the small displacement spinor. Through the method of homogeneous coordinate transformation, the error transfer process of typical coordination between four kinds of spindle parts is analyzed, and the key tolerances on the error accumulation path are connected together, and the geometric rotation error analysis model of spindle is obtained. Combined with Monte Carlo simulation method, the range of geometric rotation accuracy of spindle is obtained by statistical analysis, and the tolerance value is obtained, and the contribution of tolerance to rotation accuracy of each part is obtained by sensitivity analysis. It provides the basis for the improvement of tolerance design results. The results show that this method can effectively predict the geometric rotation accuracy of the precision spindle and the influence of the tolerance of each part on it.
【作者单位】：西安交通大学机械工程学院;西安交通大学机械制造系统工程国家重点实验室;
【基金】：国家科技重大专项资助项目(2015ZX04014021)
【分类号】：TG502.13

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