Abrasivejet Cutting Head With Novel Entrainment Structure and Method

摘要

An abrasivejet cutting head assembly comprises abrasive inlet means for permitting entry of abrasive material into the head's longitudinally-extending passageway about an inlet axis that is preferably non-intersecting with the passageway's longitudinal axis. The abrasive is then prevented from entrainment into the waterjet by means within the passageway that only permits entrainment downstream from the region of abrasive entry after the abrasive particles have attained a generally coherent downstream velocity. The foregoing can be accomplished within the cutting head, within a user-replaceable insert in the cutting head or within the abrasivejet nozzle.