Patent GB-392692-A (GB)
Title: Improvements in or relating to a method of and machine for removing projections suchas flash from metal sheets
IPC: B23D79/02
Filed: 1932-02-29
Abstract: 392,692. Broaching. BUDD INTERNATIONAL CORPORATION, 25th Street, Philadelphia, U.S.A.-(Assignees of Kelley, G. L. ; 2500, Hunting Park Avenue, Philadelphia, U.S.A.) Feb. 29, 1932, No. 6082. Convention date, March 10, 1931. [Classes 83 (iii) and 83 (iv).] Tools; welded joints; power hammers.- Projections are removed from metal sheets, such as the flash from a number of sheets flashwelded edge to edge, by pulling the sheet longitudinally of a line of projections past fixed cutters which shear the projections on one or both sides of the sheet, the opposite faces of the sheet being supported over extensive areas in the vicinity of the cutters so as to prevent distortion thereof. The draw bench has a pair of chains 28 which are symmetrically arranged on opposite sides of the seam and engage clasps 37 for pulling the sheets through the machine. The chains are driven by an electric motor 32 and gearing 31 and pass between walls 34 surmounted by rails 35 and over guides 29, 30 secured to the framing. Slots 36 between the rails 35 act as guides for the clamps. The top of the bench is covered by sheet metal plates 43 so as to support the work. The cutter head 63<1> is adjustable in a frame 62 by a screw 66 and locked in adjusted position by screws 67 and the cutter head 63 is connected to a toggle 69, 74 pivoted to a lever 72 and adjusted either by a screw 70 or by a reciprocating motor 75 operating the toggle, oblique cutters 80, Fig. 5, are socketed in the heads, are adjustable by set screws in removable jibs 81, and are locked in position by wedges 861. Ribbed bars 82 are adjustably mounted with heads alongside the cutters for supporting the work so as to prevent distortion and to provide passages for repose from the flash so as to prevent scarring of the sheets ; the ends of the bars are pointedly sharpened at 84 so as to facilitate entry of the sheets and lateral rearwardly inclined recesses 89 are provided for the escape of chips from the cutters. The sheets are previously welded so that one sheet has a projecting end 118, Fig. 11, in order to facilitate entry of the sheets into the cutters. The portion of the flash that can readily be removed by contact is first knocked off by a steel bar swept by the operator over the top surface of the sheet so as to prevent refuse from jamming in the cutters and thus scarring the sheets. The sheets are pushed into the clamps 37, which have hooks 40, Fig. 8, for subsequently engaging the chains. At this stage the clamps are aligned transversely by a pair of spring- pressed pivoted arms 49. The joint is also alinged longitudinally by a guage 59 and the sheet then secured to the clamps. The arms 49 are now withdrawn by pedal levers and the clamps pushed forward to engage the chains. Any loose flash is removed by a brush 90 rotated counterclockwise by an electric motor 91 and the sheets then pass through the cutters, which are adjusted so as to cut the flash only down to the line 117, Fig. 12, so as to avoid damaging the rest of the sheet. Loose flash is again removed by a pair of motor-driven brushes 100, 100<1> and by an air blast from pipe 101, the valve 105 of which is opened by engagement of the end of the sheets with a roller 107 on the lever 106. The sheets are then drawn through a number of motor-driven power hammers 94, 94<1> and anvils 96 for flattening the rest of the flash level with the surfaces of the sheets. Such hammer motors are put in operation when the sheets engage a switch 98, Fig. 9, and are put out of action when the sheets leave the switch 99. In this manner the seam is hammered completely from end to end. The clamps are removed on reaching the end of the top run of the chains and are sent down troughs 112, from which they are conveyed by a belt 109 in an inclined trough 110 to a receiving box 114.