Superfinishing is atechnologythatpublic literature suggests to have potential forincreased powerdensity. A study was conducted characterize this technologies benefit to bending fatigue. Two sample groups were created, one from AMS6265, and the second from AMS6265 with super finishing. Bending fatigue was characterized using two test methods, Single Tooth Bending Fatigue (STF) and R–R
Moore rotating beam. The STF specimen was designed such that the tooth geometry replicated the normal cross section of a Rolls–Royce high power spiral bevel pinion gear. The design then allowed for the special processing of the STF gears to be common to that of the spiral bevel gear.
Two unique heatlots ofmaterial were used foreach sample population. Each heatlotwas processed through manufacturing as a separate machining batch. Thus, a minimum of two carburization and hardening loads, two shot peen batches and two super finishing cycles (if applicable) were processed per sample group. Sixty–two bending fatigue test points were created. Data analysis ofSTF and RR Moore test dataconcluded no statistical difference between the bending fatigue strength the two populations.
AGMA 06FTM01-2006 pdf download
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