7.2m OD Shield Tunneling Machines Slew Rings

The internal gear four point contact ball rotary bearing with an outer diameter of 7.2 meters was officially launched by the company on December 11, 2023. The inner tooth four point contact ball slewing rings with an outer diameter of 7.2 meters was officially launched at Huaxin Slewing Bearing. This bearing is used in shield tunneling machine segment assembly machine and is currently the largest diameter segment assembly machine turntable bearing in China. Due to its large diameter and thin-walled product, the processing difficulty is high, especially the large deformation of the inner gear ring tooth surface after quenching, which brings great difficulty to processing. After repeated process demonstration and experimental exploration, we finally summarized a set of processing flow for ultra large diameter thin-walled products, providing technical support for us to process larger diameter thin-walled products in the future. And process experience.