关键词: 磨料流, 力模型, 微量去除, 冲击载荷, 表面形貌

Abstract:

The driving force mode of micro-cutting and the controllable factors of polishing effects in abrasive flow machining were studied. The source of micro-cutting force contained medium force, squeezing load among gains and grain impact force  were presented and their force models were built. Controllable influencing factors contained process temperature, process pressure, piston velocity and medium viscosity, grain properties(such as size and hardness) and so on. The relation among controllable influencing factors and the polishing effects of surface roughness and material removing rate was studied by the physical quantity ‘force', and the effect extent on the workpiece surface were quantized by active grain force acting on workpiece surface. Active grain forces acting on workpiece surface were translated into axial force and radial force, the ratio of which would affect micro-cutting effect. The handy measuring equipment of axial force and radial force was proposed. The method of mode and research's validity were verified by experiments, it is found that the direction of processing track on workpiece will affect the final roughness and material removing rate severely.

Key words: abrasive flow, force model, micro-cutting, impact load, surface topography