TECH FRONT
nant cause of gear noise is transmission error. Modification of the pinion tooth surface with a shaving cutter was found to reduce transmission error up to two times. Improved surface finishing with honing was a new process- ing technique mentioned in TP68PUB189 discussing the state of the art in gear production. Another primary emphasis in the paper was on forming the gear teeth rather than cutting them. In aviation, increased helicopter requirements led to heav- ily loaded, long-life gears—hobbed, hardened and precision ground—in the rotor drive systems from the jet engine.
Research and Improved Techniques A Texas A&M University research project detailed in TP93PUB146, coauthored by SME past president John E. Mayer, Jr., highlighted precision gear manufacturing at Bell Helicopter Textron. Four high-impact projects in the areas of heat treatment and grinding were identified and yielded significant results. Specific grinding energy causing thermal damage in helicopter gear steel was investigated in TP-
01PUB168, also by the Texas A&M team and a US Army researcher, and presented at NAMRC 2001. To satisfy objectives for improved physical properties and grain structure of gears and reduced overall manu- facturing costs, roll forming was proposed by Ford Motor Co. engineers in TP70PUB71. True then as now, the team needed “to aggressively meet the continually changing and competitive environment in which we find ourselves today… to challenge traditional concepts and institute new ways of doing an old job.” One of the most critical forms of broach- ing is the internal or external generation of gear teeth and splines. TP90PUB478 discusses how broach manufacturers have steadily progressed to meet the challenges set before them with new and improved techniques for broaching. TechFront is edited by Senior Editors Patrick Waurzyniak,
pwaurzyniak@sme.org, and Ellen Kehoe,
ekehoe@sme.org.
SME Technical Papers (coded as TP…PUB…) and search options for the collection are available at
http://tinyurl.com/SearchTPs.
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