Prediction of stress distribution in press-fit process of interference fit with a new theoretical model
Prediction of stress distribution in press-fit process of interference fit with a new theoretical model
复制标题
DOI：
10.1177/0954406218799783
复制
发表时间：
2018-09
期刊：
影响因子：
--
通讯作者：
Xingyuan Wang;Z. Lou;Xiao-dong Wang;Xiupeng Hao;Yue Wang
中科院分区：
文献类型：
--
作者：
Xingyuan Wang;Z. Lou;Xiao-dong Wang;Xiupeng Hao;Yue Wang
过盈配合由于其在轴与毂之间传递轴向力或扭矩的能力强而被广泛应用于许多工业领域。但是过盈配合在其使用寿命期间的性能受到应力集中和表面磨损的限制。目前，以厚壁圆筒理论为基础的理论方法日益丰富。然而，由于忽略了应力集中的影响，对压配过程中应力分布的预测结果并不准确。由于应力分布对分析表面磨损和装配质量，特别是对小零件的精密装配具有重要意义，因此本研究的目的是建立一种新的理论模型来预测应力分布。基于非均匀线荷载作用在半无限大平面上的简化模型，推导了应力分布方程。最后，利用理论模型分析了压配过程中的应力分布，以及不同材料对（Ni 36 CrTiAl-50 Ni-50 Fe，AISI 1045-AISI 1045）在全接触条件下的应力分布。理论计算结果与数值计算结果的对比表明，新的理论模型对应力分布和最大应力的预测精度较高，相对误差小于17%。因此，新的理论模型能给出更合理的结果，为过盈配合的设计提供更可靠的方法。该模型为不同结构和工况下干涉分析的优化提供了方法，为装配质量的实时评估提供了理论依据。
Interference fit is widely used in many industrial fields for its high ability to transmit an axial force or torque between a shaft and hub. But the performance of interference fits during their life in service is limited by stress concentrations and surface wear. Nowadays, theoretical methods based on thick-walled cylinder theory become increasingly abundant. However, the prediction results of stress distribution in press-fit process are not accurate for ignoring the stress concentrations. Since the stress distribution is significant for analysis of surface wear and assembly quality, especially for precision assembly of small parts, the purpose of this study is to build a new theoretical model to predict the stress distribution. The stress distribution equation was deduced based on a simplified model that a nonuniform linear load acts on a portion of semi-infinite plane. Finally, the stress distribution in the press-fit process was analyzed by the theoretical model, as well as the stress distribution of different material pairs (Ni36CrTiAl–50Ni-50Fe, AISI 1045–AISI 1045) under full contact condition. The comparison between theoretical and numerical results shows that the new theoretical model has high accuracy in predicting stress distribution and maximum stress, and the relative error is less than 17%. Therefore, the new theoretical model can give more reasonable results and provide a more reliable approach for design of interference fits. Furthermore, the model provides a method for the optimization of interference analysis under different structures and working conditions, and gives a theoretical basis for real-time estimation of assembly quality.