GB664979A - An improved method for fastening the end of a work-piece to the surface of a sheet metal plate - Google Patents

Abstract

664,979. Jointing by forging and stamping. AKTIEBOLAGET SVENSKA FLAKTFABRIKEN. Aug. 22, 1949 [Aug. 28, 1948], No. 21766/49. Class 83 (iv). The end of a workpiece is fastened to the surface of a sheet metal plate by placing the said end as a die underneath a sheet metal plate while a punch cuts two slots in the latter and bends the plate at the edges of the slots after which another punch deforms the bent portions of the plate and also the end of the workpiece so that the deformed end of the workpiece is locked with the deformed parts of the metal plate. A plane sheet metal workpiece 12, Fig. 2, is placed vertically with its upper edge in contact with the lower surface of a horizontal plane metal sheet 13, and a punch 14, having an end slot in alignment with the plate 12, is applied to cut a metal strip 18 joined at both ends to the plate 13 and to stamp out tongues 19, 20 which are so supported during the stamping operation that they are pressed into contact with the plate 12. The strip 18 and the upper edge of the plate 12 are now deformed by a second punch to the shapes shown in Fig. 3 at 18a and 26, respectively, whereby the part 26 is firmly held between the strip 18a and the tongues 19, 20. A number of U-shaped sheet metal plates 27, Fig.. 8, are fastened to a plane sheet metal plate 28 by applying a punch 29 shaped in correspondence with the inner surface of a U-shaped plate 27 and having side surfaces 34, 35 forming sharp edges with the bottom surface 36, the remaining edges of which are rounded to cut a strip 39 downwardly bent within the plate 27. A punch 40, Fig. 10, is then applied to bend the strips between successive plates 37 to the shape 41a, and the upper edges 42 of the U-shaped plates 27 are bent over the strips 39. The outermost legs of the plates 27 may be fastened by a punch of a different shape forming a depression 41b in the plate 28. If only one U-shapedplate 27 is to be fastened to the plate 28 a punch 40a may be combined with the punch 40, so that the deformations 41a and 42 may be made simultaneously at both sides of the member 27.