| 摘要 |
According to a method for producing head elements for heaters, a piece of sheet metal ( 1 ) is deep drawn and cut along the edge ( 9 ) of an open side ( 6 ) to obtain a hollow body ( 8 ) with larger and narrower sides ( 4,5,14,15 ). An aperture ( 12 ) is made on each opposite larger side ( 4,5 ) of the hollow body, and threaded rings ( 26 ) are then applied around the lateral through apertures ( 12 ). Notches ( 16 ) are made on the opposite large sides ( 4,5 ), along the edge ( 9 ) of the open side ( 6 ), and then three cores ( 18 ) are introduced through the edge ( 9 ), so that a flange ( 17 ) around the notches ( 16 ) can be made by pressing, so as to close the sheet metal ( 1 ) around the cores ( 18 ) widening the notches ( 16 ). After the cores ( 18 ) have been removed, the edge ( 9 ) is welded along the flange ( 17 ) of the widened notches ( 16 ), thus obtaining holes ( 21 ) separated from each other. |
