Roll-finishing of Involute Helical Gears in Crossed Axes System : 3rd Report, Tip Relieving of Die-Wheel

Abstract

A crossed axes is capable of roll-finishing under lower loading than a conventional parallel axes system, and a fairly good tooth form can be obtained. However, it is difficult to keep a smooth engagement between die-wheel and work-gear so that an interference between the tooth tip of the die-wheel and the tooth root of the work-gear can easily occur, so a roll-finished tooth flank has a small pit near the tooth bottom. In this report, in order to make this pit smaller, a relieving was given to the tooth tip of the die-wheel. According to experimental results of roll-finishing by such a die-wheel, the amount of a tip relieving must vary properly in the longitudinal direction. Then a fairly good roll-finished tooth form without any pit can be obtained by a crossed axes system.