Manufacture of piston rings

Details Manufacture of piston rings Manufacture of piston rings

B - Operations, Transporting

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B22F 7/08 (2006.01) B22F 5/02 (2006.01) C23C 24/02 (2006.01) F16J 9/00 (2006.01) F16J 9/26 (2006.01)

Patent

CA 1183741

TITLE IMPROVEMENTS IN OR RELATING TO THE MANUFACTURE OF PISTON RINGS INVENTOR John Ernest TANNER and Robert WEDGE ABSTRACT A method of treating piston rings to render them extremely hard-wearing, wherein the rings are assembled in batches on a tubular mandrel which is then surrounded by a matching cylinder, the mandrel bearing the rings and the cylinder being subjected to relative cyclical motion while a slurry of hard silicon carbide particles is poured into the cylinder. Either the wall of the tubular mandrel, or the wall of the cylinder, or both, are provided with holes to allow the slurry to flow away. The cyclical motion may consist of rela- tive rotation at 170 r.p.m. and simultaneous relative recipro- cation at 5 cycles per minute. The slurry may consist of 220 mesh silicon carbide powder in oil, with the treatment lasting for one minute, and preferably this is followed by a further treatment of one minute with a 400 mesh silicon carbide part- icle slurry.

370562

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