Kawasaki Jukogyo Kabushiki Kaisha

Takeshi Hirokawa

Takashi Kawashima

Masanori Kiyoshige

Tomonobu Okada

In an apparatus for cutting a work by an abrasive water jet containing abrasive particles, an abrasive suspension such that abrasive particles with an average size of up to about 100 microns are held in suspension in water is supplied to a jet nozzle assembly in which the abrasive suspension is induced by a high pressure ejected water and directed against the work. The ejected water is passed through an ejected water passageway to which is connected an abrasive water orifice of an abrasive water nozzle tip. The abrasive water orifice has an upstream tapered portion the diameter of which gradually increases toward an upstream opening at which the abrasive water orifice is connected smoothly to the downstream end of the ejected water passageway, whereby the flow of ejected water is streamlined. The abrasive suspension is supplied to, and merges with, the streamlined flow of the ejected water near the junction of the ejected water passageway and the abrasive water orifice, as an outer layer of the streamlined flow, whereby a dual-layer streamlined jet is obtained which enables fine cutting and also reduces wear of the nozzle tip.

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Hyogo, Japan

Takeshi Hirokawa