US2602411A - Means for drawing material - Google Patents

Description

y 1952 M. s. SCHNELL. 2,662,411

MEANS FOR DRAWING MATERIAL Filed Aug. 2, 1949 3 Sheets-Sheet 1 INVENTOR. MBQHAEL. SQ QHNELL Y 8, 1952 M. s. SCHNELL 2,2,4H

MEANS FOR DRAWING MATERIAL Filed Aug. 2, 1949 5 Sheets-Sheet 2 25 INVENTOR.

MICHAEL S.SCHNELL.

BYZ/MMM A TTORN' y 9 1952 M. s. SCHNELL awmm MEANS FOR DRAWING MATERIAL Filed Aug. 2, 1949 s Sheets-Sheet s INVENTOR. MlCHAEL S.5c|- \NELL A TTORNE Y Patented July 8, 19 52 ENT :oF FicE j jMEANsFonnRAwI G MATERIAL 1 MichaLlSQSchfill, 'SaIemQOhi'o Application August 2, 1949, Seriatl'Noj-108L09T My invention-relates '-to means for drawin material such, "for example, sheet metal, and

thfe princ'ipal object of myhnvention is to-provide new and improved meansof this character.

: FHeretofOre, in order to efiect'a substantial reduction the diameter f an article, it was v necssarytosiibject the article to more than one with the great skill and accilr'acy heretofore r e-v quiresm producing the prior art dies and in setting up the die "and a pressior "a'drawing operation; Mariyother advantages; not herein particular-1y pointe'd o it, will appear or be'obnous tothose skilled inthe a-rt'.

In the drawings accompanying "this "specification and forminga part ":of .thisi application, there is "shown, for -*purposes of illustration, an

embodiment which my' inventi'on may assume,

and in these df'awing'S:

Figure l is a longitudir'ial'sec'tional view through a draw die illustrating an embodiment of my invention:

fgflre -2 isa plan view of a blank shown in section in 'r'igure 1, but "drawn to a slightly smaller-sca e, r I Fi'g'iir'efi' is seamen-a1 viewsimilar to-Figure '1, lint with parts differentf'position, V fFigure 4 is a perspective view dfa partially 'rmedfe e I l Figureh is "a, "sectional ew similar to" Figures 1 and 2 but with p arts'in differenvpo'sition, and Figure 6'is a perspective view of a shell resulting from one operation of the die herein disclosed. Referr-ing to the drawings the embodiment herein shown to disclose the invention comprises a die body 10 which isherefshown in the form of a tubular body providing a cylindrical die cavity H. The die body ['0 has a top flange l2 formed with agenerallyplaneiupper surface l3, the latter merging with the 'adjacent surface of the die cavityin a roundedvdrawing edge [4. The

t-e body yhereinshownalsoxhas a bottom flange fI S secured, as bymeansofibolt's I6, to, arshoe or plate n, and the latter adaptedto be 2 Claims. (01. 113 46) secured to the bolster-plate |"8'-'or"simi 1ar surface shoe H. v

of a suitablepres's (not shown).

Disposed within'the die-cavity I l l and extending upwardly-from the shoe 1"! punch 19 which is here shown as' in the formof a "cylindrical projection formed 'with 'ashouldered'aperture 20 for the reception 'of -a -'bo1-t 2l which is threaded into theshoe l1. I if Theuppersurfacefof the punch I9,""a's'herein disclosed, is positioned some :distanbe heldw the opening into the 'die'cavity 'H, c surface may be'curve'd'and'a plug 2 ably fitted into the aperture n the has an Out8r'surfabe f0imi1ig fa Continuation "(if the upper surface' ofthe plug l9,

The diameter of the plug [9 is less tha nfthe diameter of the die cavity 'l lfto i'orm-an'aiinular ring-like'space'23 therebetween. A strippernn 2'4 isslidable -aX ia11y Witliin the space 23, and pins 25 are;resilientlyfpresse'd(by-rubber cushion or pneumatic pressure) againstthe'strippefrhig 2'4 and "ilrgeit in a direction away 'f'r'oin'the sleeve-means'z's is adaptd'fOl'codpilt with the die cavity 11 and'thepunch I9 'a'nd in'the embodiment "herein disclosed, such {means tem prises a sleeve 2Tsgectire'd, as byineans'o fbolts 28, to a head jz'e' which adaptd'to b se'cured to a mov'abl'e portion of the press, such as to therar'n an,

The sleeve '21, as here shown, is in the term of a cylinder, having outer and inner wausurfaces 3| and 32 respectively. The free end of the sleeve 27, in the embodiment disclosed; lies in a plane 'norm'al to the axis of "thefsleev'e, and has rounded outer and inner drawing edgesr as and 34 respectively. a

A blank holder 35 is tbrmed with anape'rt'ure 36 to permit the sleeve -21 to -work therethrtju'gh, and as here shown,'has aidwer generauyqpiane surface 31 cooperable with 'the'su'face 13 'ofthe upper flange l-2ft'o 'ciamp'a blank 38 therehtw'een.

As swell known i'nfthe art, the mask holder 3 5; presses the peripheral portion of the blank 38 to the surfac'e f3 throiighjaction of "suitable means (notshown) tenet-smear drawing of the blank 38 may be 'efiected. vj V As best seen in figures, theouter wen "senses of the Sleeve 21 has proper operating clearance withthe die cavity I'Land as bestseen inFi'gure '5 the inner wall surface of the 'slee'vefll' h'as proper operating clearance with the punch 'l9.

In operation, andassuining that the sleeve '2] has been withdrawn from,-the diecavity lnl as shown-in Figure -1, a blank-38 is positioned on drawn to a cup-shaped article as best shown at 40 in Figures 3 and4.

During this operation considerable heat is generated in the blank and therefore the metal is,

made more pliable than it is in cold condition.

Further, during this drawing operation, the metal is caused to flow from flat shape to the drawn shape.

The sleeve 21 continues its descent and carries the cup-shape article 40 with it, and shortly after the blank has been drawn to. cup-shape, and before the metal has lost its heat from the drawing operation just described, and before the metal has taken a set, the sleeve 21 presses the cupshaped article over the punch l9.

Figure 3shows the position of the sleeve-21 just before the cup-shaped article is pressed over the punch 19. As the sleeve 21 continues its descent, the bottom 40a of the cup-shaped article is pressed against the upper surface of the punch l9, and the article commences to turn inside-out and is drawn over the drawing edge 34 and the upper surface of the punch, and finally assumes the shape of the shellshown at M in Figures 5 and 6.

Figure 5 shows the free end of the sleeve clear of the open end of the shell 4| and pressing the stripper ring 24 downwardly against the resilient upward force supplied by the pins 25. With the operationcompleted, the travel of the ram 39 isreversed to withdraw the sleeve '21 from the die cavity ll. As the sleeve 2! is withdrawn,

the stripper ring 24 presses against the lower end of the shell tends to strip the shell from the punch [9. The stripper ring 24 may have sufficient travel to substantially completely remove the shell 41 from the punch l9, or it may dislodge the shell and other suitable ejector means (not shown) may be provided to completely remove the shell 4| from the punch l9 and position it so that it may be readily removed from the die cavity ll. i

It is here pointed out that the invention herein disclosed may be used with equal utility to produce either large or small diameter articles of either thin or thick gauge. Articles of considerable size and material thickness have been formed from blank shape to desired shape in one stroke of the press at a very satisfactory production rate per hour. 1

As an example, on one particular job, a shell 4% inches inside diameter by 7 inches deep and .125 inch wall thickness has been formed from a blank 12% inches in diameter. This job showed a total draw reduction of about 62 to 63% with a reduction of metal thickness of substantially 8 to 9%. Since previous methods required more than one die because it was heretofore not practical to secure so great a draw reduction, it will be appreciated that considerable economy in production, handling and tool cost is efiected, and annealing between intermediate operations is eliminated.

The foregoing example is by no means an indication of the limitation of the invention, since: shells of greater diameter, depth and wall thick-- ness have been equally well producedv in one operation on draw dies of my invention.

In view of the foregoing, it will be apparent to those skilled in the art that I have accomplished at least the principal object of my invention, and it also will be apparent to those skilled in the art that the embodiment herein described may be-variously changed and modified, without departing from the spirit of the invention, and

that the invention is capable of uses and has advantages not herein specifically described; hence'it will be appreciated that the herein disclosed embodiment is illustrative only, and that my invention is notlimited thereto.

I claim:

1. A drawing die adapted for use with a standard press having stationary and movable parts, comprising a first unit including a die body and a die post, said body and post being held in axial alignment and against relative movement, and a second unit comprising a sleeve, said units being adapted for respective mounting on the base and ram members of said press so as to be movable toward and away from each other, said die body having a cavity for-receiving said sleeve,

said. .cavityand said sleeve :having cooperable drawing surfaces so that a; blank. positioned therebetween is drawn into .a cup-shaped shell by relative movement of said units to position said sleeve within said cavity, said sleeve having a recess for receiving said post, said sleeve and said post having cooperable interior andexterior drawing surfaces so thatsaid shell is inverted and drawn into a reduced cup-shaped shell by relative movement of said units to position said post within said sleeve. r

2. A drawing die for use with a standard press comprising a stationary die body having a cavity, a stationary post disposed co-axially withinsaid cavity and held against relative movement with said diebody, and a sleeve disposed co-axial with said cavity, said die body and said post being carried by the base of said press and said sleeve being carried bythe movable platen of said press and movable into said die cavity to engage and deform. a blank positioned therebetween into a cup-shaped: shell having a closed end spanning the end of said sleeve and a skirt wall disposed around the exterior surface of said sleeve, said sleeve being movable over said post so that the closed end of said shell is pushed inwardly of said sleeve by the terminal end of said post, said sleeve and said post having cooperating interior and exterior drawing surfaces for turning said shell inside-out into a reduced cup-shaped shell having its closed end spanning said post terminal end and a skirt wall disposed between adjoining interior and exterior surfaces of said sleeve and said post.

- MICHAEL S. SCHNELL.

REFERENCES CITED The following references are of record in the file of this patent: I

UNITED STATES PATENTS Number Name Date 483,008 Norton Sept. 20, 1892 516,809 Hewitt et a1. Mar. 20, 1894 1,649,841 May Nov. 22, 1927 1,879,510 Rode" Sept. 27, 1932 2,132,002 Hight ,Oct. 4, 1938 2,331,490 Menkin Oct. '12, 1943

Images