Abstract: The flow field of abrasive is transiently simulated with ANSYS Fluent, obtaining distribution and velocity of abrasive in the abrasive waterjet machining (AWJ). The movement mechanism of abrasive is studied in the area of jet machining. It also suggests that abrasive easily threads zone of static pressure and directly impacts workpiece in new entrainment abrasive waterjet machining. The impact deformation wear model of AWJ is established. The removal model of AWJ is established with impact deformation wear model and Finnie plastic shear model. This removal model suggests that the material removal is high in the central region of the workpiece. The experiments of AWJ are carried according to new entrainment abrasive waterjet system. The results have shown that the material removal is high in the central region of the workpiece. This is because that impact angle of abrasive is bigger and speed of abrasive is higher in the jet machining center areas, materials are mainly removed by impact deformation wear. The material removal is low away from the centre areas of jet machining, materials are mainly removed by plastic shear wear. The experimental result of AWJ is fully consistent with theoretical removal model of AWJ, confirming that removal model of AWJ is right.

Key words: abrasive waterjet, impact deformation wear, movement mechanism of abrasive, removal model