干气密封螺旋槽激光加工工艺的ACE法优化  

Optimization of Laser Processing Technology for Dry Gas Seal Spiral Groove based on ACE Method

作　　者：毛文元 宋鹏云[2] 邓强国[2] 许恒杰[2] 孙雪剑[2] MAO Wenyuan;SONG Pengyun;DENG Qiangguo;XU Hengjie;SUN Xuejian(Faculty of Mechanical and Electrical Eng.,Kunming Univ.of Sci.and Technol.,Kunming 650500,China;Faculty of Chemical Eng.,Kunming Univ.of Sci.and Technol.,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500 [2]昆明理工大学化学工程学院,云南昆明650500

出　　处：《工程科学与技术》2021年第2期195-202,共8页Advanced Engineering Sciences

基　　金：国家自然科学基金项目(51465026)。

摘　　要：干气密封螺旋槽槽深和槽底表面的加工精度将对密封性能产生重大的影响,但精准控制槽深和槽底表面的加工精度仍有挑战。以槽深h_(g)=10μm、槽底表面粗糙度Ra≤0.8μm为设计控制目标,开展了干气密封螺旋槽激光加工工艺的优化研究。选取标刻次数、激光功率、填充间距、扫描速度4个对槽深h_(g)和槽底表面粗糙度Ra有显著影响的因素作为设计变量,每个因素均取12个水平,通过均匀试验分别得到12组工艺参数下的螺旋槽深度h_(g)和槽底表面粗糙度Ra;然后,利用ACE非参数回归建立工艺参数与槽深h_(g)、槽底表面粗糙度Ra的映射关系,并采用蒙特卡洛法随机生成大量的工艺参数样本,再通过插值算法和样本筛选得到了3组满足设计控制目标下的工艺参数及其预测结果,并根据实际情况对3组工艺参数微调后进行试验,获得3组实际工艺参数下的槽深h_(g)和槽底表面粗糙度Ra。试验结果表明:3组实际工艺参数下的槽深h_(g)和槽底表面粗糙度Ra均满足设计控制目标,且预测值和试验值吻合。最后,以加工效率和槽底加工质量为优化目标,优选出满足设计控制目标下的螺旋槽激光工艺参数。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)=10μm and the groove bottom surface roughness Ra≤0.8μm 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 h_(g) 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.

关 键 词：干气密封 螺旋槽 激光加工 优化 

分 类 号：TB42[一般工业技术]