Patent GB-672505-A (GB)
Title: Metal working machine and method and article produced thereby
Inventor: STIEFELMAYER EUGEN
IPC: B21D22/16
Filed: 1950-07-13
Abstract: 672,505. Making hollow-ware. UNITED AIRCRAFT PRODUCTS, Inc. July 13, 1950, No. 17587/50. Classes 83 (ii) and 83 (iv). Spinning.-A pan, for baking cakes &c., having one or more recesses each with a raised bottom, is made from a metal sheet by first forming raised portions, inverting the sheet and forming larger raised portions each having one of the previously-formed portions at its centre. A spinning- machine for forming six such recesses in one sheet comprises means for holding a sheet and spinning six raised portions therein and for holding an inverted sheet, from the first operation, and spinning six larger raised portions. With the machine in the normal position shown in Fig. 1, the automatically controlled cycle of operations begins with the rise of a hydraulically - operated platen 13. Racks 34 fixed to the platen rotate pinions 33, Fig. 2, each on a shaft mounted on a table 23 and carrying a gear 31 in engagement with a rack 29 fixed to a slide 26, Fig. 1, which is thus moved out or to the right in Fig. 2. A flat metal blank, with downturned edges if desired, is placed on the slideway 24 and the product of the first operation of the machine, see Fig. 6, is inverted and placed on the slideway 25. The platen 13 then falls, thus moving the slide 26 in, brackets 27, 28 moving the work-pieces into position over a plate 35 having holes 36, 39, each of which is arranged coaxial with and between one of the formers 37, 41 and one of the spinning heads 44. When the platen 13 moves up again the formers 37, 41 pass through these holes, engage the workpieces and press them against rotating rollers 47 of the heads 44. These are each rotated through a sliding key k, Fig. 4, hollow shaft 51 and gearing in a box 54 by a motor 62 which is started at the right time by a switch 60 operated from one of the racks 34. At this point pins 68, Fig. 5, in the platen 13 engage rods 67 which act through a plate 66 and rods 63 and bearings 65, Fig. 4, to lift the heads 44 and gradually expand the arms 46 which are pivoted to rotary discs 49, each fixed on one of the shafts 51 which do not move vertically. The rollers 47 thus spin the required formations over the formers 37, 41, these having central recesses 43 to receive the raised portions 82, Fig. 6, first formed. The movement of the table 23 is controlled by a friction brake 69, Fig. 5, and the upward movement of this and of the platen 13 is limited by the fixed plate 12, a hollow cylinder 78 and a flanged sleeve 77. The downward movement of the table 23 is effected by springs 79 and limited by the shoulders 76a of the rods 76. The downward movement of the plate 66 is effected by rods 72-and springs 74 and limited by studs 70, Fig. 1, engaging the top of the gearbox 54 for the spinning-head drive. Fixed racks 21 engaged by two pinions 22 on a shaft mounted on the platen 13 assist in keeping this horizontal. Oil is sprayed on the work by conduits 86 and collected by a tray 14. Fresh work-pieces push those just operated on out of the back of the machine and a belt conveyer may be arranged to carry the semi-finished blanks, Fig. 6, to the front so that the operator may pick them up and place them, inverted, on the slideway 25.