LTZC produced a 5.2-meter slewing bearing for CITIC Heavy Industries.

Luoyang Heavy-duty Bearing(LTZC) conducted in-depth cooperation with CITIC Heavy Industries, customizing the 5.2-meter slewing bearing E8331-7P for its developed world's largest 18,500-ton free forging hydraulic press project. With an outer diameter of Φ3400mm, this bearing was one of the largest in size and strongest in load-carrying capacity among similar equipment at that time both domestically and globally, and its research, development, and production can be regarded as a technological breakthrough in the field of heavy equipment.

• Ultra-high load-carrying requirements under extreme working conditions: 

the E8331-7P bearing effectively distributes radial load, axial load and overturning moment. The rated dynamic load of a single bearing exceeds 20,000kN, and the static load-carrying capacity reaches more than 50,000kN, perfectly matching the extreme load requirements of the equipment.

• Processing difficulties caused by oversized dimensions: 

 Luoyang Heavy-duty Bearing therefore used customized super-large CNC vertical lathes and special grinding equipment. During the processing, it innovatively adopted the "segmented processing + overall fine adjustment" process. Through the real-time online measurement system, the radial runout and end face runout of the bearing were controlled within 0.1mm, ensuring the stable rotation of the rotary table under heavy load.

Achievements of the Project

The project has also become a model of in-depth collaborative innovation between Luoyang Heavy-duty Bearing and CITIC Heavy Industries, demonstrating my country's independent research and development capabilities in the field of core components of heavy equipment, and enhancing the competitiveness of domestic enterprises in the global heavy equipment market.