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Corresponding Author

El-Bahloul, Ahmed

Subject Area

Production Engineering and Mechanical Design

Article Type

Original Study

Abstract

The paper embodies results and analysis of an experimental investigation carried out to study the effect of case depth, case hardness and tooth load on the surface capacity or a relatively new type of gearing having teeth of circular arc profiles. These gears were manufactured from 16 MnCr5. Carburizing. quenching and tempering techniques were used with 0.5, 1.2 and 2 mm case depth and 46, 52 and 58 HRC case hardness. also applied tooth loads 5, 75 and 10 KN were used. These tiny pairs of gears were run to 6.7x107 revolutions at speed 1460rpm In a power circulating gear test rig using forced lubrication technique. Test gears were weighed at interval of times, the accumulated weight of removed metal were drawn with the number of revolutions, Wear rate was calculated and drawn with the applied tooth load, case depth and case hardness. A curve fitting was made for these experimental results using Grapher software. Results show that an optimum case depth of the case hardened gears of circular arc tooth profile equal to 1.1 m and also optimum case hardness of the case equal to 53.5 KRC. Wear rate increases with increasing the applied tooth load. Wear rate for unhardened gears increases by 4 to 192 times than that of the case hardened gears. An empirical formulae for the accumulated weight of removed metal with number of revolution, wear rate with tooth load, case depth and case hardness were derived, also presented on the curves and discussed.

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