基于压头圆角等效原理和边缘应力集中理论，建立了接触边界形状时刻变化的含单个相贯孔阀套的动态摩擦力计算模型；同时，引入多组相贯孔的耦合原理，建立了含多个相贯孔阀套的摩擦力计算模型，并与其实验结果进行对比，分析了气动调节阀阀套相贯孔与阀芯密封接触面的微间隙往复式动态摩擦特性.结果表明：所建立的摩擦力计算模型可行有效；相贯孔所产生的边缘应力集中效应对于摩擦特性的影响较大；含相贯孔阀套的摩擦力高于无孔阀套的摩擦力，且随着相贯孔接触线长度的增加，其摩擦力增大；较大的圆角半径可以减小相贯孔与密封面的摩擦力，而且圆角半径越大，其影响越显著.
Based on the equivalent principle of the influence of rounded punch and edge stress concentration theory, this paper proposed a dynamic friction characteristic model of single through hole that the shape of the contiguous border is changing precisely. Simultaneously, by means of introducing the coupling principle of multiple sets of through holes, the friction characteristic model was established when there were multiple through holes in the valve sleeve. By comparing the friction characteristic model with the experimental results, the micro-gap reciprocating dynamics frictional characteristic of the contact surface between the through hole of the valve sleeve and the valve body seal ring of the pneumatic valve were studied. The results showed that the friction characteristic model was feasible and effective. The edge stress concentration effect produced by the through holes has a great influence on the friction characteristics. The frictional force of the sleeve containing the through hole is higher than that of the non-perforated sleeve. Mass friction increases with the growing of length of the contact line of the through hole. The increase of the fillet radius can decrease the frictional force on the sealing surface of the through hole. The greater the fillet radius is, the more obvious the impact is.
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