115. The research of polishing nozzle quality based on discrete element method

Junye Li1, Jinglei Hu2, Xinming Zhang3, Weihong Zhao4

College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun 130022, China

3Corresponding author

E-mail: 1ljy@cust.deu.cn, 21340113539@qq.com, 3zxm@cust.edu.cn, 4zhaoweihong@cust.edu.cn

Received 17 March 2017; accepted 20 March 2017

DOI https://doi.org/10.21595/jme.2017.18353

 

Abstract. In order to get further study for the effect of abrasive grains to the wall of the workpiece during polishing process, a new method of discrete element that carry out the numerical simulation with DEM is put forward, and the visual calculation is performed for the abrasive grain movement in the nozzle. The interaction of particles-particles or particles-workpiece wall during the polishing process and the tracks of single grain in the workpiece are analyzed by observing the distribution of abrasive grain in the workpiece at different time. The surface removal mechanism of abrasive grains to the workpiece material is discussed by analyzing the collision process of particles to the workpiece wall. The wear level of the abrasive grains to the inner surface of the workpiece is studied through the force of abrasive grain to the workpiece wall consumption, and finally explore the cutting effect of particles to workpiece wall. As a consequence, the abrasive flow processing experiment is carried out. The surface roughness of the large hole and small hole of the nozzle are detected by stylus measurement. The conclusion shows that the surface roughness for the large hole and the small hole before the experiment is1.741 μm and 1.201 μm, its 0.801 μm, 0.651 μm after it. Further roughness tests are performed on the surface of the pores by means of a grating surface measuring instrument. The result indicates that the surface roughness reduces from 2.67 μm to 0.697 μm, 0.728 μm, 0.782 μm. Apparently, the surface roughness of the hole is sharply reduced, which has a smooth and flat inner surface, the effectiveness and reliability of the abrasive flow are verified.

Keywords: abrasive flow, discrete element, numerical simulation, collision, surface roughness.

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Cite this article

Li Junye, Hu Jinglei, Zhang Xinming, Zhao Weihong The research of polishing nozzle quality based on discrete element method. Journal of Measurements in Engineering, Vol. 5, Issue 1, 2017, p. 29‑39.

 

Journal of Measurements in Engineering. March 2017, Volume 5, Issue 1

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