Geometrical deviations in the manufacture and assembly of mechanical products often result in non-parallel bearing surfaces in the bolted joint. To reveal the influence of the non-parallel bearing surface on the loosening of the bolted joint, the paper proposes a non-parallel bearing surface anti-loosening analysis model, revealing the anti-loosening mechanism of the non-parallel bearing surface, and found that the non-parallel bearing surface will introduce additional contact pressure and contact friction torque. Within a certain range, the contact pressure and the contact friction torque increase as the inclination angle of the non-parallel bearing surface increases, and the thread anti-loosening performance is improved. A parametric finite element model is further established to verify the existence of additional contact pressure and contact friction torque, and the slip factor is introduced to evaluate the loosening. Finally, the anti-loosening analysis model and the finite element model are validated by the loosening experiment of the non-parallel bearing surface. The research result provides a new idea for the anti-loosening control of bolted joints.

机械产品的制造和组装中的几何偏差通常会导致螺栓接头中的轴承表面不平行。为了揭示非平行支承面对螺栓接头松动的影响，提出了一种非平行支承面的抗松动分析模型，揭示了非平行支承面的抗松动机理，发现了非平行支承面的抗松动机理。不平行的轴承表面会引入额外的接触压力和接触摩擦扭矩。在一定范围内，接触压力和接触摩擦扭矩随着非平行轴承表面的倾斜角度的增加而增加，并且提高了螺纹的防松性能。进一步建立参数化有限元模型，以验证是否存在附加的接触压力和接触摩擦转矩，并引入滑移系数来评估松动程度。最后，通过非平行支承面的松动实验，验证了抗松动分析模型和有限元模型。研究结果为螺栓接头的防松动控制提供了新思路。