Evaluation of Gears Manufactured by Roll Forming
Final rept. 17 Apr 1970-17 Nov 1971
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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The purpose of the research effort was to evaluate the fatigue strengths of spur gears produced by two representative roll-forming processes in comparison with those manufactured by conventional forging methods. The two forming processes tested included roll forming, wherein continuous spline-like teeth are rolled on a long solid bar which is subsequently sliced up into individual gear blanks, and a roll-generating process, in which individual blanks are prehobbed and then rolled to finished blank size. Both forming methods produced gear blanks which were within 0.007 inch of finished gear size. On the basis of both single-tooth and dynamic fatigue tests conducted on a limited number of test specimens, the roll-formed gears exhibited fatigue strengths which are essentially equal to the fatigue strength of gears produced by conventional means.
- Fabrication Metallurgy
- Machinery and Tools