| 摘要 |
PURPOSE:To effect uniform metal sheet heating by gas heater, a number of grooved gas return route is spacedly provided to plenum chamber on its face opposing to the metal sheet. CONSTITUTION:Metal sheet 5 to be heat treated is passed through prenum chambers 3,3 in the heating furnace 2. Heated gas is jetted from a number of nozzles 11 in the prenum chambers 3 to heat the metal sheet 5 from both side while floting the metal sheet 5. A number of gas return routes 12 is spacedly installed on the face 3a of the chamber 3 that faces the metal sheet 5. Gas jetted from the nozzles 11 impinges on the metal sheet 5 and flows at uniform velocity V toward both sides of the chambers 3 through end nozzles 10a and the return routes 12. Thus, heat gas flowing on the total area provides uniform metal sheet 5 heating. |
