切りくず観察によるアブレシブジェットの加工メカニズム

抄録

An abrasive jet is a water jet that contains abrasive grains, and has a greater processing force than that of a water jet. It is quite difficult to know how an abrasive moves in a high speed water jet, and the machining mechanism involved has not been revealed yet. In order for abrasive jets to be used effectively in a wide range of fields, their mechanism must be clarified. We analyzed the surfaces of workpieces processed by an abrasive jet and the forms of chips to know the machining mechanism involved. It was revealed that in the case of a water jet, the surfaces of workpieces deteriorated in both the upper and lower sections, while an abrasive jet produced good surfaces in the upper section, but its surfaces deteriorated as it moved down the workpiece. This is because the abrasive's speed is great enough in the upper section to grind the surface of the workpiece, but when it slows down as the machining proceeds through the workpiece, the abrasive loses its effect. It shows that in the lower section the erosion mechanism of an abrasive jet is the same as that of a water jet. It corresponds to the results obtained from the analysis of chip forms, too.