Патент USA US2407575код для вставки
‘Sept. 10, 1946. ‘A. EpNELsoN 2,407,573v ‘ METAL FORMING MACHINE Filed Feb. 8, 1945 40 22 32 20 MX A.m mmmmUR BY¢ . _ 8 .i nrroxwer" Patented Sept. 10, ‘1946 2,407,573 ‘iUNlTEDx STATES PATENT’ OFFICE ' 2,407,573 . METAL FORMING MACHINE ' Alex E. Nelson, Los’ Angeles, Calif.,. assignor to . _‘ H . Douglas Aircraft Company, Inc., ‘Santa Monica, _ Calif. f Application February 8, 1943, Serial No. 475,193 13 Claims. 1-. This invention relates to a machine-for form (01. 78-61) .‘ movably to a surface contour, by forces acting in ing metal‘ and particularly to a machine for ‘ all radial directions, but in the same sense, with respect to a common center. If the forces act in shrinking or stretching sheet metal.‘ ‘ Sh'eets of metal inltheir ?nal‘fabricated- form or'at (some intermediate stage in-the" process of ‘ a centrifugal sense the result is a, stretching of the metal from the center and if the forces act in " fabrication may have a surface shape or a condi -a centripetal ‘sense the result is a shrinking of the metal toward the center. The machine of "tion‘ requiring correction.- The sheet 'may be planar and havelocalized‘ bulges or ridges. It ‘i may have» a generally cylindrical‘ or‘ other-curvi linear shape interrupted by local deformations. the invention may be utilized toredistribute the ‘metal in a sheet to remove bulges, to form bulges, to eliminate internal stress, to shorten or elon gate either narrow or wide strips of sheet metal, Or‘ it_ may have a plane surface or generally 17curved surface in which‘ itis desired to'form bulges or other local deviations from its general 3 either as a whole or along one edge portion there of and to thicken or thin sheet metal either in local areas spaced from the edges'of the sheet or the desired surface contour but possess internal 15 in bands extending to the edges of the sheet. stresses which are of a weakening or otherwise Shortening or elongating a wide sheet, or other h'armful character in view of the use to which it wise correctively forming it over elongated zones is to be put. In many such cases a machine of or strips, may be accomplished by repeatedly ap - surface contour. Or‘ a sheet of metal may have this invention is of useful application. > _ plying the machine at aligned loci. It has heretofore been practiced to shrink or 20 - stretch sheet metal along straight or curved lines in one direction only. Two pairs of gripping dies or jaws are used, each pair contacting a surface ’ of the metal sheet and the two dies of a pair , ‘It is one object of the invention to provide a. machinefor upsetting a sheet af metal centri petally or centrifugally while it is ‘constrained to a prescribed surface contour.‘ It is another object of the invention ‘ to provide moving toward and away from each other along 25 a machine for the ful?llment of the above object by means of two sets of sector shaped dies ar - a singlestraight or curvilinear directional line. . The die surfaces are roughened to grip the metal sheet so that in the shrinkingmachine as they - approach each other they may push the metal ranged with their apexes at'a common center and, capable of moving radially with‘ respect to the center from an initial position. particles together, thickening the sheet along 30 It is another object of the invention to provide transverse lines and shortening the sheet longi for the resilient return of the dies of such a tudinally, and in a stretching machine as they machine to their initial position. ~ move apart they may similarly elongate a sheet. It is another object of the invention to provide Processing of sheet metal in accordance with this for the registering axial alignment of the dies of prior practice is limited for the most part to 35 one set with the corresponding dies, respectively, shrinking and stretching of relatively narrow strips of sheet metal which it is desired to shorten ' or. elongate as a whole or along only one edge portion thereof. For it is mechanically di?icult of the other set. ' It is another object of the invention to provide a die machine for centrally shrinking the metal in a, generally circular zone of a metal sheet, to mount and operate dies of this type which are 40 which shall provide for the above described re long enough to reach from side to side of a wide silient return andregistering alignment of the sheet. If shorter dies are used, the metal just dies. beyond the ends of the strip which is being acted upon by the dies inhibits the shrinking action of the dies upon the metal within the strip. ' Again the single directional shrinking is an inefficient way of removing “cans” or local bulges While the machine described below represent one embodiment of the invention which is de 45 signed for centripetal shrinking of sheet metal, other sheet metal shrinking machines may like ‘ wise embody the invention. The invention may from a metal sheet or of eliminating internal also with obvious modi?cations of structure be stresses apt to cause “cans” or otherwise inter embodied in a machine for centrifugal stretching : ‘fere with the use of the sheet. Such defects, be 50 of sheet metal. " cause of their two dimensional character are not In the drawing which are illustrative only, usually readily eliminated by upsetting the metal Figure l is a side elevation of the upper and in a‘single directional manner. lower dies and die holders of a machine of this ‘ -eThe machine of this invention involvesessen .tially the upsetting. of sheet metal, while held 1m 55 l . Figure 2 is a sectional view of the set of upper invention. . V l 2,407,573 ' 4 dies and die holder therefor taken along the line 2—2 of Figure 1. ' ‘ plane in a direction normal to the ?ange. If the _ shrinking dies are applied to this ?ange with their Figure 3 is a side elevation of one of the sets of . dies. axial center adjacent to the outer edge 54 of the ‘ ?ange at spaced intervals along the ?ange, the Figure 4 is an enlarged plan view of one of the 5 metal of the ?ange is crowded together to a vary dies. ' - ing extent, the action of the dies being such as to ' Figure 5 is a perspective view of a ?anged mem- thicken and shorten the metal to a maximum ber, illustrating .;'a, csiwork artic-len'livhich; maypbe ;‘Tde_>gree; adja'centithe edge>§54;1the degreecof thick 7 processed‘lby -a mac-hineof this invention. a l eninglan'd shortening "decreasing'iacross' the ?ange An upper die holder iii and a lower die holder 10 and reaching zero at the joint line 48. A pair of 12 are mounted on a machine (not shown). which ‘ _ zldies moving in a single direction to and from each provides means for moving the upper sdieuholder .‘ toward the lower die holder to effect a ‘pressural ,--other,as.,i_n,prior practice, are obviously operating v‘at 'a'disa‘dvantage, the metal near the Web resist inglthecmovementsof the dies and inhibiting the posed therebetween. The lup'per-i'die holder: it!) has <15 idesired shrinkageof the metal near the edge 54. ' relation of the dies with aisheetggoinnetals-llll ,dis a conically bottomed recess IS in its lower face. The lower die holder l2 ,isesimilarlyrformed ‘its upper face with arecess I8. ' " ‘ “W “ ' ‘ ' A machine constructed in accordance with this I ,inizention -wilLmore the metal readily, wherever " ‘ ' applied. If any portion of the metal resists move 7 The recesses‘ I6 and I8 each hold zen-equal; :xm’ent dile to its surface contour or'to adjacent number of sector shaped dies 20, which are sized 20 stiffening metal formations, suchv as the web 50, .riand. Shaped 1' so that» when; their; rim i aces : 2 2 ,en. thexdiescontactingathat, portionatehdeto;haveiless ijg?gellthei?cylindl‘i?al SideKWQHHZA,"of'j'th?jlleQessf of ,rthezcorresponding GiehQklHrSiQB-~wa11si:26;of;:a1[1y wozpmximate diesware separated braclearance : paceaniandthe"apexestilrof the di'esiaraspaced. , amovementrelative tattle-work Object taqWhQle, and the opposite diesato vhavelgreatermovement relatire to the Worls- object causingqasL shift g-ofjthgv rk object. RT iS-Lieaturec th "in vention-adentsithe.machgleror .h11. smallidistance fI‘Omgthe ,axial‘cernt‘elrfrsz‘lof the ~_ - ierholding recess. , Ina-the; drawing each-die hold- '- ierentgkinds ,g-loig work, 1varticleseandg i r isshownas:mountingxightdies. 'rnurnber-of Idifferent results. I‘ ' .. Retaining; pinsiM, cthreadedlyasecured jngjihe , v This-,ieaturexis ,a1smn'acjcantage1their‘ acylindrioaliwallscefi‘ofethe dieholdersengage ‘an-r30 ,nrinsi-elegof :‘the' invention .ierturesit?dn.theldiesgtwprevent‘rotationa1:move---mentrofi-the dies .andzaccidental:disassemb1y._of embedled ' ystretchi-ngmachine ' oration are moved iillrwhiqhetheg outwardly alonghr. (1149511., :;;the:rdiesif-r0m ;the;;diei;holder. [These-apertures maan?initi .1 ohnormal, centrahposit i-‘verseIy sloping cam surfaces;orrsothgltzmean?nas ' rare :idimensioned ito cpermitllimited. longitudinal ,» instance; in, eliminating rin-ternal ~ ensile ,caxi'a-l I .‘zrspringsfll?gseat?d'ln movement-of theidies. recessestlt2 ' in; the;side1walls l ‘ ‘ 'essesiinrelymurved a-?ang ioinihlme-v ined~,t0..~;a;web-t ' ’ i r ‘, 1:26; ofir thedies hold the: dies; resiliently‘; apartzto theextent permittedvby; the :walls 0f§17h6;di€.hQlding recesses. , V . 1 ‘ ,, , . . V , H , .I; claim: _ 1. ; ":Therwol‘k contactingrefacesiildiiof the diesrarefio In a deviceiorproducingagchangepfzioigm a; piece: oi;~sheet.;meta_1, ,thegcornbination, of: -».sandeblasted .or otherwiseroughened:to1prevent fz-ti'wo eetsof‘gripping-iaWs;theesets being movable vthe idiessslipping. on the sheetumetalr'workr, article. The opposite end, faceofeaich‘die hasthershape 1_;t;owar.r1can,draway:from 894911‘. Qilh?lfn?llldx?wh prising 1&1? :leastthree; sector;s;h_aped wiof-ra' conical :se'ctor :‘conformingctosthembottom of h'thegrecess. » A 1’1 ' _ _ ; fav?herrjinl the operation o?the'rma‘chinerthe dies iio'fi thetwogsetssarer-brought intoecontact with’ the :oppositeiside's;respectively, ofaag-sheet of :metal which is tov be processedpasf-for rin'stancei-tdrbe i1l0ca'11y‘~ shrurlik-T to ‘ eliminate-ta ‘- planar-lfdeviation such:as' a “can”: or bulge; ‘the axially- acting pres; sure of the machine :causeslthe:sixteen»idies to iimoveicentr‘allyi'by reason“ ofIthe'cam-action of i'ithe'» ‘comically - v shaped? bottom l faces :oi the l'two .‘ ?recesses i6 andeil'?.‘ --A. ciroularr-lporti'onroff the l55Z?r$kme?in$if®rifrai?i?nylmQYjng said ,J metal sheet containing at leastaepor-tion of the s, *- 1; (D as mersensesfrom saidzinitialzposition withiltesnoct ibulge: is gripped and pressed'into-ithe general wtorsaidrcenter. =p1ane~of the sheetland'the‘met'al thereof is moved toward‘the reentrallraxis 32 ‘of the ‘die rholders, ‘:2. .~The~~-comhinati0n; de?ned rinzblaizmjiltaindé‘in ' :ad?li 0n1thereto;,:means.;forresilientiyrretrieving #as " shrinking measured slightly= before-being?attened thertotali area-of -between‘the ‘portion the ,1 cos-S V aWs: ‘he; Orv-their ombinainitial ,Qnrldefm?d position.» dmelaim . , 1,1,.o?n dies so that when the die pressure is releasedthe ='whi?hssaid:?rstsandcsecond; meanseincludemam slack-of therbu-lgeis ‘goneand ‘thesheet-cannot i-spring-back to itsijbulged condition. '»'U-pon~re- r1ifa¢€S‘1Q1l$hB§I1 iacesxof; said :iawszof reach ;:set;:opgrpgsite:ztheiltgrippingrfacesm?orx ;a generally ‘ *lease oi'thepressureoil'the'ldies'kwhenrthernpper':65 conical surfaceacoaxia withasaid *die holder-‘it is"retractivelyelevated;‘the springs MWretu-rn the dies to-theirinorma1 or initiaLposi-"»tion as-showninlFig-ur'e 2. ' '- fA‘rmachine‘of the‘ invention hasimanyl?eldseof ivtcentensandv .i-f Ether-include opposingzpressure memhersrhav g worrespondingz‘cooperatinggconicallyiashaped .. uriacesrthereon. > V : . . . v ‘ .- l ' ' ' ia'idevice' foriproducingcacchangeso?:iorm use in forming sheet metal bodies‘.v ~For-example, :lO-zinazpiec l'sheetrmetal, 1the-.ucombinaition-.sof: a ?ange 46 shown in Figure 5, which is vintegrally ittwowsetszof, ripping,jawsgithersetsrbeingcrriovasble '-joinedvt0 a web‘E? ‘on a c'onvexly curved jointline 4:48 lying in the plane of. the ?ange, quite Ifrequenlt1y has a surface contour presenting .scallopelike r-towandicandaway.fromzealch.othergkmdreachsaid set comprising atprleasti:threensector:shapedcjaws their-.apexes ‘aicommonscenterianditheir »~-W‘¢W6S g 0r“ Wrinkles '52 > departing from , its. general ‘ 3.75 grinning- iaces it aired‘ rtosiform aiconmlonasubstané s 2,407,573 5 6 tially circular surface juxtaposed to a similar cooperating common substantially circular sur face formed by the gripping faces of the other two sets of gripping jaws, the sets being movable toward and away from each other, and each set comprising at least three jaws disposed with their sheet gripping faces in juxtaposed on a common each two proxi mate jaws; a ?rst means for axially relatively moving the jaws of each set toward the other set to press them against a work sheet; and a second means acting coordinately with said axi~ 10 ally moving means for radially moving said jaws of each set against the resilient action of the the other set to press mounting means to diminish the clearance spaces. both sets against a work sheet; and a second means acting coordinately with said. ?rst means 5. In a device for producing a change of form for moving said jaws in said radial manner and metal, the combination of: in the same sense. gripping faces faired to form a common sub stantially circular surface juxtaposed to a sim ilar cooperating common surface formed by the ' ' other set of jaws; means mounting the jaws of each set to hold them resil to a similar cooperating common by the gripping faces 35 sockets in the sides of said proximate jaws. 7. The combination de?ned in claim 1, and in addition thereto; means for preventing rotative movement of said jaws in said mounting means. 8. The combination de?ned in claim 1 in which said mounting means are held non-rotatively and in addition thereto; interacting means on each of said jaws and the mounting means therefor 9. A device for shrinking a, metal sheet com prising two jaw housing members movable to wards and away from each other, a plurality of 50 gripping jaws reciprocally disposed side by side in each housing member with the outer ends of one set of jaws facing the outer ends of the other set of jaws, the jaws of each set being relatively movable laterally in a manner to shrink the sheet having a directions, the jaws of the respective sets being axially reciprocable in their respective recesses and having cam surfaces con~ forming respectively to the ?rst mentioned cam 60 surfaces whereby upon movement of the sup other to move porting members toward each other the respec at least two directions. tive sets of jaws are moved laterally inwardly to ward the longitudinal axis of the jaw supporting 10. In a device for producing a change of form i I in a piece of sheet metal, the combination of: 65 members. ALEX E. NELSON.