ABRASIVE WATERJET WORKING APPARATUS AND WORKING METHOD

PROBLEM TO BE SOLVED: To provide an abrasive waterjet working apparatus which has improved working accuracy and working efficiency by attaining excellent fluidity of an abrasive inside a nozzle.SOLUTION: An abrasive waterjet working apparatus 100 works a workpiece W by spraying the workpiece W with an abrasive waterjet AWJ composed by mixing a high-pressure working liquid Q with an abrasive G. The working apparatus includes: an abrasive waterjet nozzle 1 for spraying the abrasive waterjet AWJ; a high-pressure water supply device 101 for supplying the nozzle with the working liquid Q; and an abrasive supply device 8 for supplying the abrasive G to the working liquid Q. The abrasive G is composed of a coated abrasive G3 obtained by coating a surface of an abrasive material G1 made of abrasive grain with a water repellent material or a fluidity enhancing material G2. The abrasive supply device 8 supplies the abrasive waterjet nozzle 1 with the coated abrasive G3.