High-temperature furnace for the annealing of sheet-metal joints

Abstract

A high-temperature furnace for the annealing of sheet-metal joints ( 4 ) is described, having an annealing base ( 2 ), having a support device ( 3 ), which forms a placement surface ( 17 ) for coaxially receiving a sheet-metal joint ( 4 ) with spacing above the annealing base ( 2 ), having a protective hood ( 6 ), which coaxially encloses the annealing base ( 2 ) with the support device ( 3 ), and is connected to a protective gas supply line ( 10 ) and a protective gas exhaust, made of a cylindrical jacket ( 7 ) and a cupola ( 16 ) which terminates the jacket ( 7 ) on top, having a peripheral seal ( 9 ) between the annealing base ( 2 ) and the protective hood ( 6 ), and having a heating hood ( 13 ) which encloses the protective hood ( 6 ) with spacing. In order to allow uniform annealed material heating, it is proposed that the axial jacket section of the protective hood ( 6 ) which is determined by the vertical spacing (h) of the placement surface ( 17 ) of the support device ( 3 ) from the annealing base ( 2 ) has a surface which makes up at least three-fourths of the cupola surface.

1 . A high-temperature furnace for the annealing of sheet-metal joints ( 4 ) having an annealing base ( 2 ), having a support device ( 3 ), which forms a placement surface ( 17 ) for coaxially receiving a sheet-metal joint ( 4 ) with spacing above the annealing base ( 2 ), having a protective hood ( 6 ), which coaxially encloses the annealing base ( 2 ) with the support device ( 3 ), and is connected to a protective gas supply line ( 10 ) and a protective gas exhaust, made of a cylindrical jacket ( 7 ) and a cupola ( 16 ) which terminates the jacket ( 7 ) on top, having a peripheral seal ( 9 ) between the annealing base ( 2 ) and the protective hood ( 6 ), and having a heating hood ( 13 ) which encloses the protective hood ( 6 ) with spacing, wherein the axial jacket section of the protective hood ( 6 ) which is determined by the vertical spacing (h) of the placement surface ( 17 ) of the support device ( 3 ) from the annealing base ( 2 ) has a surface which makes up at least three-fourths of the cupola surface. 
     
     
         2 . The high-temperature furnace according to  claim 1 , wherein the surface of the jacket section corresponding to the vertical spacing (h) of the placement surface ( 17 ) from the annealing base ( 2 ) at least corresponds to the cupola surface. 
     
     
         3 . The high-temperature furnace according to  claim 1 , wherein the surface of the jacket section corresponding to the vertical spacing (h) of the placement surface ( 17 ) from the annealing base ( 2 ) is 5 to 20% greater than the cupola surface. 
     
     
         4 . The high-temperature furnace according to  claim 1 , wherein the annealing base ( 2 ) is constructed from mineral wool, and the support device ( 3 ) penetrates the annealing base ( 2 ) and is supported on a furnace foundation ( 1 ). 
     
     
         5 . The high-temperature furnace according to  claim 4 , wherein the height of the annealing base ( 2 ) constructed from mineral wool at least corresponds to one-third, preferably one-half, of the diameter of the protective hood ( 6 ). 
     
     
         6 . The high-temperature furnace according to  claim 1 , wherein the peripheral seal ( 9 ) between the annealing base ( 2 ) and the protective hood ( 6 ) is implemented as gas-tight, and the protective gas supply line ( 10 ) has outlet openings ( 11 ) distributed around the circumference of the protective hood ( 6 ), and the protective gas exhaust has an exhaust gas line ( 12 ) which centrally penetrates the annealing base ( 2 ). 
     
     
         7 . The high-temperature furnace according to  claim 1 , wherein the protective hood ( 6 ) can have a heating power, which decreases according to height, applied to it by the heating hood ( 13 ).