Selection of Blank for Helical Bevel Gear and Determination of Size and Accuracy

Blank type determination:

In general, 20GrMnTi alloy steel is used for driving axle gears of automobiles and carburized and quenched.CA1092 Automotive Drive Axle Gear Material and Heat Treatment.Gear hair germ is manufactured by die forging process in mass production.After normalizing, the hardness is 157~207HV.

Blank structure, size and precision determination:

Simplify the structure details of the parts. Because the parts are produced in large quantities, the blank accuracy is taken as normal grade and CT9 grade.Based on these data, a rough drawing is drawn.As shown: