On Tooth Form Accuracy of Roll-Finished Involute Helical Gears

In order to improve the quality of roll-finished involute helical gears, a calculation program for roll-finished tooth form has been developed, which can deal with tooth form correction of die-wheel and tooth form error of work-gear before roll-finishing. In this calculation, gradual changing of tooth form of work-gear with progress of plastic deformation is taken in consideration. Some comparisons between calculated and measured tooth forms of helical and spur gears roll-finished by die-wheels with and without die-profile correction under some roll-finishing conditions showed fairly good coincidence. This program can therefore help to decide the optimum tooth form of die-wheel and the optimum working condition.