Mathematical model and surface deviation of cylindrical gears with curvilinear shaped teeth cut by a hob cutter

Abstract

The generating motion of a cylindrical gear with curvilinear shaped teeth cut by a CNC hobbing machine is proposed. On the basis of the cutting mechanism and the gear theory, the surface equation of this type of gear is developed as a function of hob cutter design parameters. Computer graphs of the curvilinear-tooth gear are presented based on the developed gear's mathematical model, and the tooth surface deviations due to machine-tool settings with nominal radius of circular tooth traces are also investigated