Purpose

Assembly accuracy is the guarantee of mechanical product performance, and the characterization of the part with geometrical deviations is the basis of assembly accuracy analysis.

Design/methodology/approach

The existed small displacement torsors (SDT) model cannot fully describe the part with multiple mating surfaces, which increases the difficulty of accuracy analysis. This paper proposed an integrated characterization method for accuracy analysis. By analyzing the internal coupling relationship of the different geometrical deviations in a single part, the Monomer Model was established.

Findings

The effectiveness of the Monomer Model is verified through an analysis of a simulated rotor assembly analysis, and the corresponding accuracy analysis method based on the model reasonably predicts the assembly deviation of the rotor.

Originality/value

The Monomer Model realizes the reverse calculation of assembly deformation for the first time, which can be used to identify the weak links that affect the assembly accuracy, thus support the accuracy improvement in the re-assembly stage.

中文翻译：

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单体模型：一种用于装配精度分析的几何偏差综合表征方法

目的

装配精度是机械产品性能的保证，几何偏差零件的表征是装配精度分析的基础。

设计/方法/方法

现有的小位移扭矩（SDT）模型不能完全描述具有多个配合面的零件，增加了精度分析的难度。本文提出了一种用于精度分析的综合表征方法。通过分析单个零件不同几何偏差的内部耦合关系，建立了单体模型。

发现

单体模型的有效性通过模拟转子装配分析得到验证，基于该模型的相应精度分析方法合理地预测了转子的装配偏差。

原创性/价值

单体模型首次实现了装配变形的逆向计算，可用于识别影响装配精度的薄弱环节，从而支持再装配阶段的精度提升。