Development of Conductive Heating Technology for Hot Stamping Process
摘要
Recently, trends in the vehicle industry have reinforced regulations on fuel efficiency and CO2 emissions. Therefore hot press forming that makes lightweight high strength automotive body parts using thin boron steel is the key of above regulations. However the heating furnace is sorted by excessive energy consumptive facilities in hot press forming process which consumes more than 50%. The main goal of this paper is to contribute to the development of hot press forming process that uses resistance heating and direct cooling technology. The primary research focuses were resistance heating technology for steel sheets including selection the electric power source and also delivery ways of a high current, direct cooling technology for heated steel sheets, and the formation of a prototype, which would also be evaluated. By developing steel sheet heating equipment using a resistance heating technology that improved energy efficiency by 80% compared with the mass production furnace, creating molds with direct cooling method, and establishing a water shooting system for direct cooling, this research constructed just such a prototype and also verified its effectiveness.