... and cold forging, casting, precision machining and roll forming.MachiningTurning , milling , drilling , grinding , threading , CNC machining, etc. Heat TreatmentAnnealing, normalizing, carbonitriding ... , acid treatment , anodizing , painting and PVC powder coatingEquipmentSprial bevel gear milling machine, hobbing machine, grinding machine, gear shaving machine, CNC lathes ...