Patent ID: 9631248
Date: 2017-04-25
CPC Classifications: C21D,F27B,F27D,Y02P

Claim:
1. A hybrid heating furnace system for hot stamping comprising: a steel plate feed section; a first heating furnace having at least two heating zones with different target temperatures, each heating zone having high-frequency coils connected to a separate inverter; a second heating furnace at least having heating sections and a standby section, wherein the heating sections heat a steel plate transferred from the first heating furnace to a temperature greater than or equal to the temperature at which ferrite in the steel plate is transformed to austenite, and wherein the standby section controls a transferring speed of the steel plate independently of that in the heating sections; and a discharge section disposed next to the second heating furnace to receive the steel plate transferred from the second heating furnace, wherein the heating sections and the standby section of the second heating furnace each include one of an electric resistance heater having heating elements disposed apart from the steel plate and a gas heater, wherein the discharge section includes rotation rolls installed for introducing the steel plate, and stoppers installed upwards between the rotation rolls adjacent to each other in order to fix a position of the introduced steel plate, and wherein the rotation rolls of the discharge section are configured to be continuously rotated as long as the steel plate is placed thereon, such that the continuous rotation prevents local temperature reduction and deformation of the steel plate at places where the steel plate is in contact with the rotation rolls.