Heat treatment causes distortion of gear tooth geometry. Toimprove tooth quality, particularly after carburizing andhardening, gears are generally ground. For low distortion, stockremoval is small up to a maximum of 0.005 inch from each toothflank. This allows minimum surface hardness reduction with nopossible detrimental effect on gear pitting life. Uncontrolleddistortion, on the other hand, results in an undue amount of stockremoval with a significant loss of tooth surface hardness. Lowersurface hardness accelerates contact-stress-induced tooth pittingthat reduces gear life. For heavily distoeed gears, the pittinglife may be reduced as much as 30 percent after grinding. For arealistic evaluation of the pitting life of ground, carburized andhardened gears with uncontrolled distortion, derating factors arenecessary and established for a number of gear materials.
- Edition:
- 98
- Published:
- 10/01/1998
- Number of Pages:
- 7
- File Size:
- 0 files
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