Heat Treatment of Gears: A Practical Guide for Engineers
Annotation Rakhit wants other engineers to avoid the considerable trouble he had understanding the art of gear heat treatment when he first embarked on a career in gear design and manufacturing. He explains how heat treating and gears made of some kinds of steel gives the gears high geometric accuracy, but can also distort them and raise the cost of manufacturing, so a gear engineer needs to excel in manufacturing, lubrication, life and failure analysis, and machine design as well as design. He presents a case history of each successful gear heat treatment process that provide information on the quality of gear that can be expected with the proper control of material and processes. Annotation copyrighted by Book News Inc., Portland, OR
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AGMA class air-melted AISI alloy steels annealing applications bainite carbide carbon content Carbonitriding carburized and hardened carburized gears cementite compressive stress contact stress core hardness cost cracks cycle decarburization diameter Diametral pitch effective case depth eutectoid ferrite ﬁne ﬁrst ﬂank ﬂat ﬂow forging furnace gas nitriding gear blanks gear design gear materials gear steels gear teeth gear tooth gearbox grain grind burn grind stock hardened gears heat treat distortion heat treat process heat treatment high-alloy steels higher increase induction hardening inﬂuence ion nitriding iron load lower manufacturing martensite maximum microstructure Nitralloy 135M nitrided gears normalizing pearlite pinion pitting proﬁle properties quenching racks rate of cooling reduced retained austenite root ﬁllet S-N curve shear stress shot peening signiﬁcant signiﬁcantly speciﬁcation steel gears stock removal surface hardness Table tensile tensile stress through-hardened gears tooth geometry tooth surface transformation vacuum vacuum furnace vacuum-melted white layer
Page 191 - Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth...
Page 11 - ... amounts of fine pearlite and martensite (fig. 9, C). The actual amounts of these two constitutents are functions of the rates of cooling, the slower rates resulting in more pearlite and less martensite, and the faster rates resulting in more martensite and less pearlite. 4.1. Isothermal Transformation The course of transformation of austenite when the steel is quenched to and held at various constant elevated temperature levels (isothermal transformation) is conveniently shown by a diagram known...