Apparatus for Piercing Brittle Materials with High Velocity Abrasive-Laden Wterjets

Author:  Hashish, Craigen, Tacheron
Source:  US Patent 4,934,111
Doc ID:  1990117
Year of Publication:  1990
Abstract:  
An abrasivejet system for cutting brittle materials is disclosed. One feature of the disclosed system is a jet-producing nozzle assembly which includes means for inducing turbulence in the jet-forming liquid during the period in which the jet initially impacts on the brittle material so that impact stress on teh material is reduced. A second disclosed feature is a supplimentary suction device, preferable in the form of a second nozzle dimentioned for maximum suction, which maintains a generally constant feed rate of abrasive into the cutting nozzle assembly during the turbulence-inducing phase of operation.