This spur gears was applicated in agricultural equipments.
Here is the whole production process:
1) Raw material 8620H or 16MnCr5
1) Forging
2) Pre-heating normalizing
3) Rough turning
4) Finish turning
5) Gear hobbing
6) Heat treat carburizing 58-62HRC
7) Shot blasting
8) OD and Bore grinding
9) Helical gear grinding
10) Cleaning
11) Marking
12) Package and warehouse