Abstract:For the dry gas seal, the depth of spiral groove and the processing accuracy of groove bottom surface had a significant effect on the sealing performance, but there exist some challenges for the groove depth accurately controlling and the processing accuracy of the groove bottom surface. With the groove depth h_g=10 μm and the groove bottom surface roughness Ra≤0.8 μm as the designing goals, an optimization study on the laser processing technology of the spiral groove dry gas seal was carried out. Four factors of marking number, laser power, filling spacing, and scanning velocity which significantly affect the groove depth h_g and the groove bottom surface roughness Ra were chosen, and 12 levels were taken for each factor, the groove depth hg and the groove bottom surface roughness Ra under 12 sets of processing parameters were respectively obtained through uniform test. The mapping relationship between the process parameters and the groove depth h_g, the groove bottom surface roughness Ra were established by using ACE non-parametric regression, and a large number of processing parameter samples were randomly generated based on the Monte Carlo Method. Three sets of processing parameters met the designing goals and their prediction were obtained through interpolation algorithms and sample screening. After the three sets of processing parameters were fine-tuned and tested, some experimental results corresponding to the three sets parameters were obtained. The experimental results indicated that the groove depth h_g and the groove bottom surface roughness Ra under the three sets of parameters are well in line with the designing goals, and their prediction are the same with experimental values, indicating that the ACE method has a higher prediction accuracy. Finally, taking the processing efficiency and quality of the groove bottom as optimization goals, the spiral groove laser processing parameters which meet the design goals are obtained.