Network optimization information.
At present, high-strength steel and ultra-high-strength steel are good to achieve the light weight of the car, improve the crash strength and safety of the car, and become an important development direction of automotive mold steel. However, as the strength of steel plates increases, the traditional cold stamping process is prone to fracture and cannot meet the requirements of high strength steel plate processing process. As the forming conditions cannot be met, hot stamping forming technology for ultra-high strength steel plates has been gradually researched in the international arena. Extrusion die steel is a comprehensive forming, heat transfer and phase change organization of the new technology, the main use of plate in the high temperature austenite state to increase plasticity and reduce the yield strength of the characteristics of forming through the die. However, cr12 die steel hot forming technology in the process conditions, metal phase change and CAE analysis need further research, which is a monopoly in foreign countries, in the domestic development is slow.
Previously, when producing deep-drawn or heavy-drawn workpieces, pressure-resistant (ep) lubricants were the best choice to protect the tooling. Adding sulphur and chloroacetic acid additives to the pure oil could greatly extend the service life of the die. However, due to new metal-strength steels and stringent environmental requirements, the value of EP oil-based lubricants has declined and even lost its market.
