Structural Surface of Mould Softness Abrasive Flow Precision Polishing Machining Method Based on VOF

Aiming to improve the surface roughness of precision mould structural surface in finish machining, a new mould structural surface no-tool precision polishing method based on softness abrasive flow was brought forward. Dynamical model of softness abrasive flow in bound flow oriented to mould structural surface precision machining was established based on liquid-solid two-phase flow coupling theory and a continuous media theory. By the numerical simulation of softness abrasive flow field in the micro-channel, zigzag micro-channel was taken as the research object, by using standard k-ε turbulent model and volume of fluid model (VOF). The simulation results show that increase the entrance speed will improve the chance that is softness abrasive flow colliding with the wall, and it will improve the abrasive flow maching (AFM) efficiency, but the effect of finish machining will be declined. In addition, the results also show that the structure of channel has a great influent on abrasive flow machining. When diameter is 2 mm, the micro-channel with the entrance velocity is 10 m·s^-1, the turbulent kinetic energy is 0.4 m²·s^-2 and the turbulent dissipation rate is 19.8 m²·s^-3 in that condition axial of velocity and turbulent distributed more uniformly, and more machining efficiency and texture patterns of surface are obtained.