HEATING DEVICE FOR HEATING BLANKS BEFORE FORGING Russian patent published in 1998 - IPC

FIELD: hot die forging in mechanical engineering. SUBSTANCE: heating device includes three tubes of different diameters inserted one in another. Ends of tubes are welded to side walls of device forming two closed chambers between tubes. Inner surface of inner tube is provided with fire-resistant coat; many small openings are provided over entire surface of tube and coat. Nozzle are secured on intermediate tube opposite each opening. Running inside central chamber are guides. Burner is secured to outer tube. Air line is brought to intermediate tube. EFFECT: enhanced efficiency. 1 dwg