US2647422A - Machine for tapering sheet metal blanks - Google Patents

Description

Aug. 4, 1953 H. J. HORN MACHINE FOR TAPERING SHEET METAL BLANKS Filed July 30, 1948 3 Sheets-Sheet 1 Snucnfor HARRY J. HORN Gttoruegs Aug. 4, 1953 H, J, HORN MACHINE FOR TAPERING SHEET METAL BLANKS 5 Sheets-.Sheet 2 Filed July 50, 1948 FIG.

' Simeutor HAR RY J. HORN Gttorneg r Aug. 4, 1953 H. J. HORN 2,647,422

MACHINE FOR TAPERING SHEET METAL BLANK-S Fild July 30, 1948 3 SheelZS--SheeI 3 lwentor HARRY J. HORN Cttornegs Patented Aug. 4, 1953 MACHINE FOR TAPERIN G SHEET METAL BLAN KS Harry J. Horn, Lansing, Mich., assigner to Motor Wheel Corporation, Lansing, Mich., a corporation of Michigan Application July 30, 1948, Serial No. 41,601

2 Claims. l

This invention relates to a machine for tapering sheet metal blanks and in particular for tapering sheet metal blanks preparatory to forming the bodies of vehicle wheels therefrom.

It is an object of the invention to produce a machine for tapering vehicle wheel body blanks which is efficient, simple in structure, and economical in operation.

In the drawings:

Fig. l is an elevation partly in section showing my machine for tapering wheel disc blanks.

Fig. 2 is a section along the line 2-2 of Fig. 1.

Fig. 3 is a fragmentarysection showing in detail the pilot for the disc.

My machine comprises a base I, a head 2 supported on the base by a plurality of posts 3. A movable head 4 is supported on piston 5 which is reciprocably mounted in cylinder 6. A plate 1 is secured to head 4 and a flat circular platen 8 is supported upon plate 1. A small plate Il) is carried on pilot 9 and arranged to move up and down in opening positioned centrally of platen 8. The l-ower end |2 of pilot 9 is journalled in a central opening in plate 1 for both rotary and longitudinal movement. A compression spring I3 is housed in opening |4 in head 4 and acts between plate |5 and the lower end |6 of pilot 9 to urge pilot 9 upwardly so that the upper face of plate I9 normally is positioned above the upper face of platen 8.

Upward movement of 4pilot 9 is controlled by collar |1 secured by bolts I8 in the upper face of movable head 4. Collar |1 acts between shoulder |2 and shoulder |9 on pilot 9 to limit the upward and downward movement of pilot 9.

A ratchet 29 is xed on pilot 9 and is arranged to be actuated by a pawl 2| pivoted as at 22 on rod 23 which is slidably mounted for radial movement in groove 24 in the upper face of plate 1. The outer end of rod 23 engages a bell crank lever 25 which is pivoted as at 26 on head 4 and contacts the upper end of vertical rod 21 fixed at its lower end to base A source (not shown) of liquid, such as oil, under pressure is supplied through pipe line 28 to a valve 29 and port 3U to cylinder 6. The liquid is exhausted from cylinder 6 through port 30, valve 29 and line 3|.

The upper part of my tapering machine comprises two arms 32 and 33 which are pivoted at their upper ends as at 34 and 35 to head 2 to swing about horizontal parallel axes. Rollers 36 are journalled upon shafts 31 by means of roller bearings 39. Shafts 31 are xed to the lower ends of arms 32 and 33 so that cylindrical rollers .36 rotate about axes parallel to axes 34 and 35.

Axes 34 and 35 are offset equal distances from the extended longitudinal axis of pilot 9, for example, perpendicular lines dropped from axes 34 and 35 to the upper face of platen 8 will intersect the upper face of platen 8 a substantial distance to the right and left of pilot 9.

Arms 32 and 33 are arranged to be swung in and out by a hydraulic motor comprising a cylinder 39, a piston 40 to which is alxed piston rod 4|. Oil under pressure is admitted into cylinder 39 above piston 46 through line 42 and valve 43 which are connected to a source (not shown) of liquid under pressure. Liquid under pressure is admitted into cylinder 39 beneath piston 40 through line 44 and valve 45 which are also connected to said source of liquid under pressure. The lower end of rod 4|, which reciprocates in a -vertical path, is connected by means of a toggle lever comprising levers 46 and |41 with arms 32 and 33 respectively.

Levers 46 and 41 are pivoted to the lower end `of piston rod 4| at 48 and 49 respectively. Levers 46 and 41 are each adjustably connected to their to arm 32 by means of collar 56 through which lever 46 passes, pin 5| journalled in bracket 52 fixed to arm 32. Collar 50 is xed upon pin 5| and the adjusted position of lever 46 in collar 50 is controlled by lock nuts 54 threaded on lever 46 and arranged to clamp collar 50 therebetween. The pivotal connection between lever 41 and arm 33 is identical with the connection :between arm 32 and lever 46 and therefore will not be described. The eiective length of each lever arm 46 and 41 can be controlled, of course, by adjusting the arm in its respective collar 50.

The operation of my device is as follows: Arms 32 and 33 are of equal length and rollers 36 are of identical size. Arms 32 and 33 will be pivotally supported on head 2 so that axes 34 and 35 are offset equal distances from the longitudinal center of pilot 9. Valve 29 will be actuated to exhaust liquid from cylinder 6, thereby causing plate 4 to lower. As plate 4 lowers, rod 21 swings lever 25 clockwise thereby sliding rod 23 and pawl 2| to the right which in turn acts through ratchet 20 to index pilot 9 and disc 58 one step or notch counter-clockwise, as viewed in Fig. 2. The disc 58, which is to be tapered, is provided with a central opening which nicely ts the non-circular contour of pilot 9 so that rotary indexing of pilot 9 will cause corresponding indexing of plate 58. Plate 58, of course, will be mounted upon platen 8 and pilot 9 while head 4 is lowered. At this time spring I3 will hold pilot 9 and plate upwardly the arms androllersv 3,6 lnwardlm.. Will/k at their uppermost limit so that the disc 58 does not touch platen 8.

Preferably piston 4U will be at the upper end of its stroke so that arms 32 and 33 are at the inner end of their stroke, full lines Fig. 1. Valve 29 is actuated to admit liquid into cylinder 6, causing plate 4p to risegand idisc 58 his brought against rollers 36 .and nspring I3 collapses as 'platen 8 moves up against the under face of disc 58. At

this time valve 45 is opened to exhaust and liqlfd,

under pressure is admitted thro l ,l ,L piston 4|, causing piston 4l to o'v n"its"dwn ward stroke and act through rod 4I and toggle u" levers 46 and 41 to swing arnisf32 and33andtllei I rollers 36 outwardly.

As rollers 36 move outwardly they also move toward the upper face of platenfz,thereby.tarngrfv` l ing the disc. Each roller will roll'or taper'abut" one-eighth of the disc per pass of the roller.'

Valve 43 will now be" opened to exhaust and Operated to lower ,.nead.. 4 l, whereupnlindexins mechanism .20?21 indexesthepplatej and disse about one-eighth of a turn. Tlielabove desribed operation is nowrepeated until a suilicientnumber of rolling passes. haveheenmade to complete the tapering fof thegdisc wlieieuphrl.1.the` discgis removed.'

Pivots 34 and35iare each mounted uponblocks .60 Yslidably supported uponhead2 and adjust- Iable thereupon bylmeans of screw'l .'.andQhand wheel. Thus the degree of. taper'irnpa'rted to disc `5&3 'can' be controlledby adjusting fulcrums or Ypivots 34 .and35A toward or away from the 'extended longitudinal axis of'pilot 9'. Axeszaaandst are 'paralleltb eachother and to'the upperplane V rSurface f platen S'WhCh supports 'the blank. 58

From theabrove it is evident-"that the blanlll is operated'jup'betwee'n'the nsrlppemace of platen 3' dthrbiiers at v'vhizzh opefaterfm adjacent 'the "tenter pr trie' tiapigftowar trie circunifrnce'ofrthe blank; the rolls beiiig"`further frein dieser fait@tfitrreA pates whennfey are pass so that when the arms 32 and 33A are forced apart by the hydraulically actuated toggle the rolls swing in an arc and toward the platen and thereby cause the disc to be tapered or rolled thinner from the center of the disc toward the circumference of the disc.

I claim;

l. In ja' Imachine form tapering blanks of the type having a platen with a plane surface adapted to support a blank to be tapered, the combination of astationary frame, an arm having a fixed pivotal connection at its upper end on said frame about an axis located above, and parallel to, the plane surfaceof said platen, the said axis being `positionedfabovethe platen and between the centerla'nd theperiphery of said platen, a freely 1rotatable roller. rfixedly mounted upon the lower end loi" said arm about an axis parallel to the axiswabout which said arm pivots so that as the arm swings abouljfsaid lrst mentioned axis said' roller, is' caused to travelalofng anarcuate path concentric to said i'irst mentined axis' and extending in a directionradiallyof saidgplatc'n, the pivot for.l said 'arnirbeing jpositionedabove Asaid'platen so that a perpendicularl lineexterided from the axis to the planevsurface of said platen will join the platen'at'a position a substantial distance radially outwardlyromLthe center of the platen whereby as the arm swings irom'the center of the platen voutw,ardlytowardthe periphery thereof'the rollerjat the :lower end- Qf said arm rolls and tapers the, blank so. that thel blank decreases in thickness from the center toward the edge of the blank, and means` for causing isaldv roller to engage and roll a taper on thejsurface of' a blank' supported' on said )platen 'comprising power actuated toggle means positively aboutl'its' axis.

2. The combination set forth inlclaim l including means for adjustably moving'the pivotal connection between sf'alda'ri'nandsaid frame'rl ycorintected to saidiarin yior'swingingv saidarm Aa plane parallelto 'thapl'ane Surface-'dfwsaid plateri'fand'iria direction generallyradially of said platen.'l

HARRY J. HORN.

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