Feature and process technology

Usually  we use forgings, bar stock, or casting with good toughness that are easy to machine, often using forgings

First normalizing the rough part to improve their machinability and roughing

In the semi-finishing process, the gears are basically formed, after which they are processed to obtain the mechanical properties of the gears. According to the requirements of the working conditions and the materials used ,the quenching and tempering, the carburizing quenching, and the tooth surface high-frequency induction are used. Heat quenching, nitriding and other processes make it possible to obtain the mechanical properties that should be obtained under different working conditions.

Finally, the gears need precision machining .

Steel grades for different working conditions

Medium hard gear (HB220-320): 40Cr, 42CrMo, 40CrNiMo, 38CrMoAl and other medium carbon alloy steels

Hardened gear (HRc56-62): 20CrMnTi, 20CrMnMo, 20CrNiMo, 20CrNi2Mo, 12CrNi3, low carbon alloy steel.

Nitriding gears: 25Cr2MoV, 38CrMoAl

For large diameter (D> 400-600mm) tooth blanks can not be forged, cast steel tooth blanks can be used, generally used ZG45, ZG 40Cr, ZG 42CrMo, ZG 40CrNiMo, ZG 38CrMoAl and other medium carbon alloy steel. The steel composition of the cast steel is equivalent to the chemical composition of the forged steel and only increases the Si content to 0.60-0.80%.

Chemical component