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Features of internal high-pressure forming dies: ① It enables simultaneous hydraulic punching of a dozen or so holes; it is equipped with moving mechanisms, has a complex structure, and is similar to a machine； ②It has to withstand high clamping forces, resulting in complex stress and deformation conditions, which makes design challenging ； ③In a mass production environment, it is necessary to ensure a moving seal against the high-pressure water medium at the pipe ends. http://www.*ngdimc.com/wp-content/uploads/2017/03/neigaoyacheng*ngmuju-300x233.jpg Breakthrough in key technologies: A breakthrough has been achieved in the dynamic sealing technology for pipe ends under ultra-high pressure conditions of 400 MPa, enabling high-pressure sealing using water as a medium for pipe ends processed on conventional sawing machines, thus ensuring efficient production ； Breaking through the technology of porous synchronous hydraulic punching, it enables simultaneous punching of up to sixteen holes in all four directions of space (top, bottom, front, and back) ； A stamping die structure for sealing tube ends with irregular cross-sections was invented, eliminating the transition section from the irregular shape to a circular one; as a result, the material utilization rate increased to over 90% ； By utilizing the variable clamping force strategy of internal high-pressure formers, the die load is kept at a low level, significantly reducing the die volume and thus lowering die costs. Key achievements: A variety of mass-production molds have been developed for domestic brand sedans as well as internationally renowned sedan brands. These molds are used to manufacture components such as subframes, control arms, front crossbeams, dashboard brackets, chassis front beams, and exhaust system parts for models including the Audi A6L, Chrysler 300C, BAIC B40, Mazda, and FAW Pentium B50; in total, these components have been installed in over one million vehicles.