激光凹坑拆解减损织构对过盈配合服役承载性能的影响实验研究

在再制造和设备运维阶段的拆卸过程中，过盈配合表面常因强烈的摩擦效应发生损伤。实验发现在配合界面上添加激光凹坑织构可有效降低拆卸损伤，且激光加工形成的熔融层增大了过盈配合面间的滑移阻力，有利于提升其服役承载能力。正交实验结果显示，相较于织构密度，织构图案尺寸与织构形状对界面滑移阻力的影响更为显著；等效圆直径100μm、面密度25%的椭圆织构具有良好的滑移阻力提升效果。在60 MPa到150 MPa的接触压力范围内，该类型织构表面的法向变形量大于无织构表面；且随着接触压力的增大，具有熔融层的织构表面的法向变形量更为稳定，其增幅远小于无熔融层织构表面和无织构表面。

Experimental Study on the Effect of Laser Pit Texture on Bearing Capacity of Interference Fit in Service

During the disassembly process of remanufacturing and equipment operation and maintenance, the surface of the interference fit is often damaged due to the strong friction effect. The experimental results show that adding laser pit texture on the mating interface can effectively reduce the disassembly damage, and the melting layer formed by laser machining increases the slip resistance between the interference mating surfaces, which is beneficial to improve the service bearing capacity. The orthogonal experiment results show that compared with the texture density, the texture size and texture shape have more significant effects on the slip resistance of the interface. The ellipse texture with an equivalent diameter of 100 μm and a surface density of 25% has a good effect of increasing the slip resistance. In the range of contact pressure from 60 MPa to 150 MPa, the normal deformation of the textured surface is greater than that of the non-textured surface. With the increase of contact pressure, the normal deformation of the textured surface with the molten layer is more stable, and its increase is much less than that of the textured surface without the molten layer and the non-textured surface.