约束式磨料流光整加工方法及其加工特性的实验研究.

Aiming at the difficulty in achieving the control of micro uniform grinding force and the profiling finishing for the traction wheel groove of elevator utilizing the traditional grinding processes, a constrained abrasive flow finishing method was proposed, and the process characteristics for the abrasive flow were studied by means of theoretical modeling, simulation analysis and finishing experiment. Firstly, the principle of the constrained abrasive flow finishing was analyzed, and a hydrodynamic model of the abrasive flow was constructed based on the Eulerian multiphase flow theory and the standard k-ε double equation model. Then, the fluid dynamics characteristics of the abrasive flow within the constrained flow passage were calculated and studied, yielding the variation patterns of fluid dynamic pressure and abrasive pressure on the workpiece surface with the key process parameters. Finally, a constrained abrasive flow finishing experimental platform was established, and the comparative experiments of finishing were conducted using ductile iron as the workpiece material to verify the simulation calculation and the processing method. The research results indicate that the abrasive pressure and the dynamic pressure reach their maximum values within the constrained space, which is the effective finishing area. Within the range of 15 to 75 degrees, the smaller the inlet angle of the constrained space, the more uniform the distribution of the abrasive pressure, and the more intense the fluid dynamic pressure. As the height of the constrained space decreases, the dimensionless material removal rate increases exponentially, resulting in higher processing efficiency. [ABSTRACT FROM AUTHOR]