PRODUCING MICROASPERITIES ON BEARING SURFACES

摘要

1511420 Locally hardening steel CATERPILLAR TRACTOR CO 30 June 1976 [17 Nov 1975] 27225/76 Heading C7N Micro protuberances are produced on the surface of a martensibically hardenable steel (particularly the wearing face of a bearing or seal) by directing on to the surface a high energy beam of varying intensity while providing relative motion between beam and surface. As a result of the expansion resulting from localized martensite formation the protuberances are formed and assist in lubricant relention. In a particular embodiment the surface is scanned by a laser beam which is chopped by an apertured disc as in Fig. 2 to produce ramp-shaped protuberances as in Fig. 8.