Elbow precision machining technology by abrasive flow based on direct Monte Carlo method

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Elbow precision machining technology by abrasive flow based on direct Monte Carlo method LI Jun-ye(李俊烨), ZHU Zhi-bao(朱志宝), WANG Bin-yu(王彬宇), ZHANG Xin-ming(张心明), WANG Fei(王菲), ZHAO Wei-hong(赵伟宏), XU Cheng-yu(徐成宇) Key Laboratory for Cross-Scale Micro and Nano Manufacturing of Ministry of Education, Changchun University of Science and Technology, Changchun 130022, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: The investigation was carried out on the technical problems of finishing the inner surface of elbow parts and the action mechanism of particles in elbow precision machining by abrasive flow. This work was analyzed and researched by combining theory, numerical and experimental methods. The direct simulation Monte Carlo (DSMC) method and the finite element analysis method were combined to reveal the random collision of particles during the precision machining of abrasive flow. Under different inlet velocity, volume fraction and abrasive particle size, the dynamic pressure and turbulence flow energy of abrasive flow in elbow were analyzed, and the machining mechanism of particles on the wall and the influence of different machining parameters on the precision machining quality of abrasive flow were obtained. The test results show the order of the influence of different parameters on the quality of abrasive flow precision machining and establish the optimal process parameters. The results of the surface morphology before and after the precision machining of the inner surface of the elbow are discussed, and the surface roughness Ra value is reduced from 1.125 μm to 0.295 μm after the precision machining of the abrasive flow. The application of DSMC method provides special insights for the development of abrasive flow technology. Key words: precision machining by abrasive flow; direct simulation Monte Carlo method; abrasive particle collision; processing technology Cite this article as: LI Jun-ye, ZHU Zhi-bao, WANG Bin-yu, ZHANG Xin-ming, WANG Fei, ZHAO Wei-hong, XU Cheng-yu. Elbow Precision Machining Technology by Abrasive Flow Based on Direct Monte Carlo Method [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4562-0.

1 Introduction With the advancement of technology, the use of elbow parts in aviation, aerospace, automotive and other fields is becoming more and more common, and the requirements for the accuracy of the internal surface have also increased [1, 2]. The improvement of the accuracy of the inner surface of the curved pipe parts is conducive to the continuity

and stability of the transmission of the fluid medium in the pipeline, is helpful to avoid vibration and noise, and effectively prolongs the service life of the components. However, due to the complicated spatial structure of the elbow, the general precision machining methods are difficult to meet the requirements of the use conditions, and the abrasive flow precision machining technology can well complete the precision machining process of c