Improving gear profile with an electroplated cBN wheel for high accuracy gear profile grinding the development of a truing machine for high accuracy wheel grinding

摘要

load capacity of gears could be remarkably improved by making their tooth surface roughness smaller than 1μm Ry. In order to produce such gears, the authors developed a precision CNC gear grinding machine of the forming type. The shortcomings in using the above grinding machine was that the productivity of grinding with a conventional wheel was low, and the layer below the ground surface was occasionally damaged by a residual tensile stress. Consequently, to supplement the precision grinding process, the authors also developed a microtruing machine which creates a high accuracy profile and a uniform grain height of the electroplated cBN grinding wheel. The machine realized an axial stiffness of 300N/μm on the wheel spindle, and a positioning accuracy of about 50 nm. A conventional wheel was microtrued on the microtruing machine and tested for grinding a gear.The gear profile error, as lμm.