| 摘要 |
<p>According to a method for producing head elements for heaters, a piece of sheet metal (1) is deep drawn and cut along the edge of an open side to obtain a hollow body (8) with larger and narrower sides (4,5, 14m15). 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 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.</p> |
