磨削区磨料流体动压力仿真研究

Simulation Investigation on Hydrodynamic Slurry Pressure in Grinding Zone

根据Navier-Stokes方程和流体流动的连续性方程,建立了砂轮约束磨粒喷射精密光整加工中砂轮/工件楔形接触区磨料流体动压力的数学模型;进行了砂轮速度、砂轮/工件平均最小间隙以及砂轮直径对楔形区磨料流体动压力影响的仿真研究。结果表明,流体动压力随砂轮速度的提高和平均最小间隙的降低而增加,最大压力峰值发生在砂轮与工件平均最小间隙区域,且在该区域压力梯度变化明显;除了在砂轮宽度边缘产生侧泄外,在砂轮宽度方向流体动压力分布规律相同;随着砂轮与工件之间平均最小间隙的减小,动压力峰值区域曲线变窄,砂轮直径对流体动压力影响不明显。

The hydrodynamic slurry pressure modeling of wedge zone between wheel and part on abrasive jet finishing with wheel as restraint was established based on Navier-Stokes and continuity equations. The effect of the velocity of wheel and mean minimal clearance and the wheel diameter on hydrodynamic slurry pressure was investigated by simulation. The emulational results show that the hydrodynamic pressure is proportion to the velocity of grinding wheel, and inverse proportion to minimum clearance between wheel and part, the peak pressure is generated just in the minimum clearance region in which the higher pressure gradient is attained. The pressure distribution is uniform in the direction of width of wheel except at the edge of wheel in which pressure exists side-leakage. The smaller the gap distance is ,the narrower peak pressure distribution becomes. The hydrodynamic pressure has not obviously change with different wheel diameter.