Process flow chart of spiral bevel gearBy zhygear / February 16, 2020 Number Procedure Machine 1 forging 2 heat treatment normalizing 3 Milling two end faces and drilling central hole Special drilling machine 4 Axle neck and back cone CA6140 horizontal lathe 5 Groove cone end face CA6140 horizontal lathe 6 Milling involute splines and drilling holes ZBT8216 combined milling and drilling machine 7 Grinding journal and end face 3T16 end face cylindrical grinder 8 Processing thread CA6140 horizontal lathe 9 Intermediate inspection Ø65.4 Ø50.40 Ø47.25 10 Rough milling gear Gear milling machine B016 11 Finish milling gear convex Gear milling machine N016 12 Finish milling gear concave Gear milling machine N016 13 Intermediate inspection Contact area, backlash and tooth surface roughness 14 Heat treatment correction Carburizing layer depth 1.2 ~ 1.6 quenching: surface hardness 58 ~ 63hrc, core hardness 33 ~ 48hrc 15 Grinding journal and end face M1420a external grinder 16 Test