Abrasive jet stream polishing

B - Operations – Transporting – 24 – B

Patent

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Details

B24B 1/00 (2006.01) B24C 1/00 (2006.01) B24C 1/08 (2006.01) B24C 11/00 (2006.01)

Patent

CA 2283131

Abrasive jet stream polishing, wherein an abrasive is suspended in a flowable jet medium (24) and projected at high velocity and pressure at a workpiece (12), where the jet is projected at the surface to be polished at an oblique angle. The method is substantially improved by forming the medium of a polymer having reformable sacrificial chemical bonds which are preferentially broken under high shear conditions. Projecting the medium and suspended abrasive breaks the reformable sacrificial chemical bonds while polishing. The chemical bonds will reform permitting recycling (80, 82, 84) of the medium and abrasive for reuse in the method. The jet is effective at relatively low pressures of about 5 to about 80 MPa.

L'invention concerne un procédé de polissage par jet de fluide abrasif dans lequel une substance abrasive est en suspension dans un milieu (24) apte à s'écouler sous forme de jet et est projetée à une vitesse et à une pression élevées sur une pièce (12). Le jet est projeté sur la surface à polir en formant un angle oblique. On améliore sensiblement ce procédé en formant le milieu en question à partir d'un polymère dont les liaisons chimiques sacrificielles, reformables sont, de préférence, brisées dans des conditions de cisaillement élevé. La projection du milieu et de la substance abrasive en suspension brise, au cours du polissage, les liaisons chimiques sacrificielles, reformables. Ces liaisons chimiques se reformeront et permettront le recyclage (80, 82, 84) du milieu et de la substance abrasive destinés à être réutilisés dans ce procédé. Le jet est efficace à des pressions relativement basses comprises entre environ 5 et environ 80 MPa.

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