■ Quality and Inspection Standard of Planet Carrier
Planet Carrier is the core component of gear box. When working, it supports the spindle and bears the longitudinal force. It has high reliability requirement for Planet Carrier. The material G32NiCrMo8-5-4 choosed for Planet Carrier has good toughness and high yield-strength ratio. In view of the importance of Planet Carrier in gear box, the casting of Planet Carrier should not have the defect of influencing strength. The main stress parts such as hub and holes should be detected by ultrasonic wave (UT), and the quality requirement should not be lower than grade 2 of JB/T5000.14-1998 technical conditions. There should be no cracks on the outer and inner surfaces of castings after wet fluorescent magnetic particle inspection (MT).