Chapter 4: Through-Hardening Gears
Through-hardening heat treatment is generally used for gears that do not require high surface hardness. In through hardening, gears are first heated to a required temperature and then cooled either in the furnace or quenched in air, gas, or liquid. Four heat treatment methods are primarily used for through-hardened gears: annealing, normalizing and annealing, normalizing and tempering, and quenching and tempering. This chapter begins with a discussion of these through-hardening processes. This is followed by sections providing some factors affecting the design and hardness levels of through-hardened gears. Next, the chapter reviews the considerations related to distortion of through-hardened gears. It then discusses the applications of through-hardened gears. Finally, the chapter presents a case history of the design and manufacture of a through-hardened gear rack.
Through-Hardening Gears, Heat Treatment of Gears: A Practical Guide for Engineers, By A.K. Rakhit, ASM International, 2000, p 21–32, https://doi.org/10.31399/asm.tb.htgpge.t67320021
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