Roll-Finishing of a Quenched Gear

Abstract

In the present paper, we discuss the possibility of roll-finishing of a quenched gear. For this purpose, we carry out experiments on the roll-finishing of work-gears which have a tooth flank hardness of H_Rc=40 or 55. As a result, it is found that work-gears of H_Rc=40 can be roll-finished without any particular techniques. For work-gears of H_Rc=55, we can also obtain a fairly good tooth form after roll-finishing if an undercut is provided for the work-gear and a crowned die-wheel is used with a slow work-feed in its axial direction. Furthermore, we compare the tooth form of the die-wheel after the roll-finishing with that before roll-finishing to reveal that there are no negative effects on the tool life of the die-wheel, although it may be shorter than that in the roll-finishing of unquenched gears.