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[Wind power] To investigate the yaw gear Quenching Distortion Problems
     On the distortion of the steel itself hardenability. Steel Harden higher volume of tissue that is involved in the transition will be. When the workpiece is completely martensitic showed overall hardenability, quenching volume difference before and after the maximum, the carbon content of the steel of 1% variation is about 1% by volume; if only half hardenability, i.e., half the volume of the quenching into martensite , the volume difference before and after the hardening smaller than the former doubled, therefore, the smaller the hardenability, quenching distortion also smaller. Conversely, the greater the gear quenching distortion.
     In many carburized gears in order to solve the distortion problem is often used to reduce hardness of heart way, however, to consider the gear strength, hardness of heart can not be too low, because a lot of important reason is the fatigue failure gear core hardness low, so this becomes a major production gear contradiction. In order to solve the contradiction between strength and heat distortion gear gear core hardness requirements, must be reasonable limits hardenability steel.

Links:
Wind power equipment pitch pinion http://www.nsk-zg.com/products-detail.asp?cpid=348
TV http://www.nsk-zg.com/products-detail.asp?cpid=347 wind ring gear