The present invention relates to a press-curing step in the heating apparatus for improving a structure that the structure of the heating furnace to heat the steel sheet blank before press hardening process so that the transport on a helical form. ; A heating furnace of the present invention apparatus, and jinipgu possible the blank steel plate is entering from the wound coil is arranged in the upper portion, having an outlet which the blank steel plate discharged to the lower has a cylindrical configuration so as to provide a possible transfer of the blank plates in the inner space and the main body by heating, is arranged as a heating spiral structure on the inner peripheral surface of the main unit in the blank steel plate toward the upper side jinipgu from the lower discharge port provided at one side of the conveyor and a conveyor for transferring sequentially composed of a clamping means for selectively clamping the blank steel plate. ; According to the invention, as well as reducing the length and space occupied by the equipment than the methods in linear heating to increase the available area of a plant, the entire region during the heating of the blank steel plate being transferred is heated uniformly done a tissue change, it is the same It is has become a useful effect that product quality is improved. ; In addition, the heating time of heating an area of the blank steel plate being transferred is increased, it is possible to shorten the heating time, has the advantage of improving the productivity.
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