en.Wedoany.com Reported - Recently, the first fully domestically produced heavy-duty electric servo stretching pad in China, featuring core components independently developed by the 704 Research Institute of China State Shipbuilding Corporation, successfully passed full-process processing, performance testing, and verification at China First Heavy Industries Tianjin Heavy Industry Co., Ltd., and officially entered mass production. The successful application of this equipment has broken the long-term technological monopoly of overseas companies, filled the gap in the independent development of core equipment for high-end stamping lines in China, and also marks the 704 Research Institute's cross-field expansion from ship equipment to high-end automotive manufacturing equipment in the field of heavy-duty precision transmission.
The heavy-duty electric servo stretching pad is core equipment for automotive stamping production lines, directly affecting the quality of body stamping, production efficiency, and overall vehicle manufacturing capability. Among its components, the large-scale heavy-load planetary roller screw is a key core component that supports the servo stretching pad in achieving high precision, high load capacity, and stable operation.
A planetary roller screw is a high-precision, high-load mechanical transmission device that transmits force and motion through the planetary movement of rollers between the screw shaft and nut. It features high load capacity, high precision, high rigidity, and high transmission efficiency, and is widely used in aerospace, aviation, marine, precision machine tools, industrial automation, and humanoid robots. For a long time, large-scale, high-load precision screws have faced high technical barriers and significant process difficulties in design, manufacturing, and testing. High-end domestic applications have long relied on foreign mature products and supporting systems, making this a critical bottleneck in the localization of high-end stamping equipment in China.
Breaking Through Precision Transmission Challenges to Support High-End Equipment Localization
To meet the localization technology development needs of the heavy-duty electric servo stretching pad at China First Heavy Industries Tianjin Heavy Industry, the 704 Research Institute custom-developed a domestically largest-scale heavy-load planetary roller screw with a diameter of 150 mm and a rated load of 220 tons. During the project, the 704 Research Institute fully leveraged its accumulated expertise in precision transmission technology and flexible manufacturing systems, coordinating the entire chain of design, process, manufacturing, and testing for efficient synergy. It innovatively established a new design system for large-scale heavy-load screws, overcoming multiple key technologies such as uniform heat treatment of ultra-large components, precision grinding of large-diameter threads, and simulation design of heavy-load thread profiles.
Facing challenges such as tight project timelines, high technical difficulty, and strict localization requirements, the 704 Research Institute project team completed the entire process from forward design, special process development, and full-machine performance verification to product delivery in just three months. This formed an integrated R&D and manufacturing system for large-scale planetary roller screws, resulting in the creation of the so-called "unyielding backbone" heavy-load planetary roller screw. This breakthrough overcame technical barriers, supported the localization of high-end automotive stamping line equipment in China, achieved a cross-industry transition from shipbuilding to the automotive sector, and significantly enhanced China's complete independent supporting capabilities in heavy-duty precision transmission, encompassing R&D, manufacturing, and application, demonstrating the responsibility and commitment of central enterprises.
The delivery and commissioning of China's first fully domestically produced heavy-duty electric servo stretching pad has addressed issues such as high energy consumption, poor forming accuracy, slow dynamic response, and high maintenance costs associated with traditional hydraulic stretching equipment from the core transmission end. It has filled the gap in key components for heavy-duty electric servo stretching equipment, opened up a fully autonomous and controllable channel for the entire chain of high-end automotive stamping equipment, provided support for China's high-end stamping lines to completely break free from overseas technological constraints, and contributed to the high-quality development of China's automotive industry.
From deep-sea equipment to automotive manufacturing, and from ship electromechanical systems to high-end precision transmission, the 704 Research Institute has always focused on major national strategic needs and the independent development of high-end equipment, serving the security and stability of the industrial chain and supply chain through key core technology breakthroughs. In the future, the 704 Research Institute will continue to leverage its technological advantages in the field of ship electromechanical equipment, promoting the application of more core technologies in high-end manufacturing scenarios, and contributing greater strength to the high-quality development of China's equipment manufacturing industry.
