To provide an abrasive water jet working machine capable of setting appropriate working conditions in piercing work and cutting work.
The abrasive water jet working machine includes a working fluid supply device 31, an abrasive supply device 4, and an injection pressure control device 32 for controlling pressure for injecting working fluids Q. The abrasive supply device 4 includes a storage hopper 41 for storing an abrasive G, an abrasive supply pipe 42 for communicating a nozzle 21 with the storage hopper 41, and an air purge device 5 for supplying compressed air to the abrasive supply pipe 42 and the storage hopper 41 and applying feed pressure to the abrasive G passing through the abrasive supply pipe 42. The injection pressure control device 32 controls injection pressure to be lower during the piercing work compared to that during the cutting work. The air purge device 5 includes a feed pressure control device 8 for controlling the feed pressure of the compressed air passing through the abrasive supply pipe 42, and controls the feed pressure to be higher during the piercing work compared to that during the cutting work.
AOKI TAKUYA
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Etsuo Tada
Yoshihiro Okabayashi
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