High-strength Steel Stamping Mold
Today’s high-strength steel and ultra-high-strength steel have achieved the lightweight of vehicles and improved the collision strength and safety performance of vehicles. Therefore, they have become an important development direction of automotive steel. However, as the strength of the sheet metal increases, the traditional cold stamping process is prone to cracking during the forming process, which cannot meet the processing requirements of high-strength steel plates. Under the condition that the forming conditions cannot be met, the hot stamping forming technology of ultra-high-strength steel plates has been gradually studied internationally. This technology is a new process that integrates forming, heat transfer and structural phase transformation. It mainly uses the characteristics of increased plasticity of sheet metal and decreased yield strength under high-temperature austenite state, and the process of forming through molds. However, thermoforming requires in-depth research on process conditions, metal phase change, and CAE analysis technology. This technology is monopolized by foreign manufacturers and has slow domestic development.
In the past, in the production of deep-drawn or re-punched workpieces, everyone believed that pressure-resistant (EP) lubricants were the best choice for mold protection. Sulfur and chlorine EP additives have been mixed into pure oil to increase the life of the mold has a long history. However, with the emergence of a new metal—high-strength steel and strict environmental protection requirements, the value of EP oil-based lubricants has decreased, and even lost the market.
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