Abstract: A new mould structural surface no-tool precision finish machining method based on soft abrasive flow is brought forward. By installing constraint module at nearby the structured surface to be machined, the surface becomes a configurable restrained flow channel (RFC). Micro force and micro amount cutting for RFC is realized by using the turbulence wall effect of liquid-solid two-phase soft abrasive flow in RFC. It will overcome the difficulty of the polishing tool to contact the structured surface and accomplish the no-tool precision machining of the structured surface. Dynamical model of soft abrasive flow in RFC oriented to structured surface precision machining is established on the basis of liquid-solid two-phase flow coupling theory. Choosing corresponding conjunction parameters of different constraint modules, annular constriant flow channel is taken as the research object, and its pressure/velocity distribution and turbulent kinetic energy are analyzed by using standard k-ε turbulent model and discrete phase model. The influence of relative variation of inlet/outlet conditions on the turbulent flow pattern can be inspected through the numerical analysis, thus providing a theoretical tool for the research of the basic law of soft abrasive flow form control and the abrasive flow characteristics.

Key words: Numerical simulation, Precision finish machining, Soft abrasive flow, Structural surface