Study on turbulence control method and surface quality analysis of softness abrasive flow machining

Abstract

To improve mould structural surface quality, the softness abrasive flow (SAF) finishing method is proposed. By setting restrained component to the mould surface, restrained flow passage can be set up. In the flow passage, micro force and quantity cutting for the tiny scale structural surface is realised by using the turbulence wall effect of SAF. Dynamical model of SAF is established based on liquid-solid two-phase flow coupling theory. Semi-annular flow passage is taken as the research object, and turbulent parameters with different flow passages are analysed by using standard k-e turbulent model and discrete phase model (DPM), which is used for describing the influence to turbulent state caused by different boundary conditions, meanwhile, the optimisation design of finishing parameters can be obtained. Finishing platform is constructed, and finishing experiment results show that with the SAF method, the roughness machined is less than Ra 62 nm.