Improvement of Gear Accuracy in Gear Hobbing : 2nd Report, Investigation of the Causes of Tooth Profile Errors by Comparing Computed Tooth Profile Errors with Measured Ones : Vibration, Control Engineering, Engineering for Industry

Abstract

The causes of tooth profile errors in gear hobbing are investigated by comparing computed tooth profile errors with measured ones, for manufacturing accurate gears. Under various hobbing conditions, gears are cut and measured. Spheroidal graphite cast iron is used as the hobbed test material because built-up edges hardly occur. From these comparisons, it is found that tooth profile errors are mainly caused by geometrical errors and the eccentricity of the hob. Tooth profile errors caused by dynamic errors of the hobbing process are very small under these conditions, though they are observed more or less in the case of helical gear hobbing. It is also confirmed that the method of calculating tooth profile error, which is discussed in the first report, is useful in analyzing gear accurcy.