US275897A - Stamping-die - Google Patents

Description

(No Model.)

P. ELY.

STAMPING DIE.

No. 275,897. Patented Apr. 17,1883.

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NIT-ED STATES PATENT trice..

PHILIP ELY, OF GENTREVILLE, NEW JERSEY.

' STAM Pl NG-DIE.

SPECIFICATION forming part of Letters Patent No. 275,897, dated April 1'?, 1883,

Application filed December 19, 1882.- (No model.)

To all whom tt may concern Beit known that I, PHILIP ELv, of Centreville, in the county of Hudson and State of New Jersey, have invented certain new and useful improvements relating to dies for stamping articles of sheet metal, ot' which the following is a specification.

It has long been common to produce stamped articles at two or more operations. This invention relates to the later impression or impressions, the blank or shell having been previously dished into an approximation to the form desired, and, it necessary, annealed after such treatment.

The invention may be applied for the stamping of many kinds and sizes ot` articles. I will describe it as adapted for the manufacture of caps for cans for petroleum and other fluids. The form required is a dish deep in the center and for a considerable space around it, with a shallow portion around that, terminating with -a beveled or conical rim.

It is common in makin g articles of this form or anlogous forms to provide, in order to compensate for imperfect centering, an excess in the diameter ot' the blank, which excess is removed by shearing, either in the act ot' stamping or after it is stamped.

I provide meansfor accurately and automatically centering the work. My blank or shell may be previously cnt to exactly the right size. This effects an economyin the sheet metal employed, as well as in the labor. The diminish-ed care in introducing the partially-formed shell into the machine allows the machine to be operated more quickly, and thus a greater quantity of work to be turned out in a given time, and also promotes the safety of the hands of the attendant by avoiding the manipulation in adjusting the shell in place, which is necessary with ordinary dies.

The followingis a description of whatI con- 4 sider the best means ot' carrying out the invention.

The accompanying drawings form a part of this specification. All are central vertical sections through a pair of dies and the immediately adjacent parts according to my invention.

Figure l shows the dies in the separated condition. The blank is shown in position to be treated. Fig. 2 shows the dies and the ac- 'to produce the finished article.

companying parts fully compressed together Fig. 3 shows the dies in the act ofl approaching each other, They have ysufciently advanced to commence the reversion of the form ot' the article being sha-pcd, which reversion constitutes a prominent feature of the invention.

Similarletters ofreference indicate likeparts in all the igures.

A is the bed-die, certain portions being designated when,necessary, by additional marks, as A A2.

B is thc central and main portion of the moving die.

C is a ring surrounding B, and movable relatively thereto. It is capable of moving vertically to alimited extent, and relatively to B, subject to the action of a set ot' springs, c. This portion G'performs the double function ot' a die to shape the metal between itself and the opposite portion ot' A, and a follower to eject the finished cap.

D is afollower mounted conccntricallywithin the lower die, A. It is movable up and down to a limit extent therein, subject to the inuence ot' a spring, d. It serves also the double functions of a die to shape the article between itself and the central moving die, B, and a follower to eject or push out the inished article. The shank of the -central moving. die, B, is inclosed centrally within the shank of a stout surrounding piece, E, certain portions of which are designated, when necessary, by additional marks, E E2. A t'air face, E', is presented properly conditioned to press strongly against the adjacent surface of the ring G, so as to force the latter into strong contact with the bed-die A when the parts are fully together. Four or other suitable number ot' recesses are formed in the face E,which receive the springs o, that force the ring Odown until a lip, C', on its upper inner edge engages with an oti'set on the central die, B, and arrests its further descent. Exterior to U is arim or lip,

E2, extending downward somewhat below the parts B and C, and beveled on its lower face, as shown.

It will be seen that the upper and working part of A is an annular rim projecting up from a body of considerablearea below. Iwill mark this body A. The part A is recessed at four or other number of places, as indicated by a,

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and receives in cach recess a headed piu, F, and spiral spring g. The pins F guide and the springs g lift the ring G, and tend to hold may be worked very rapidly, as the attendant is not required to introduce his hand into the press or to exercise any special skill in introducing the shell centrally. It may be thrown with a gentle motion from a pointoutside. Its hollow under face matches upon the movable portion D in the center of the hed die. This tends to bring the shell m correctly to the required position. If it is greatly out of place, the beveled upper surface of G aids to guide it into the correct position. If gravity does not act with sufficient force or quickly enough to effect this centering, the beveled under surface of the lip E2 performs the function of aiding to center the shell. Under the innence of all these centering means the shell is certain to be moved into the correct position, so that its periphery shall be within the rin g G and rest entirely on A and D when the upper die commences to strongly act upon it.

The article to be produced is approximately plane for a considerable surface in the centerthat portion lying between the central moving die, B, and the bottom central piece, D. I have shown these parts as adapted to produce a circular bead on this surface. Such is often required, but it is not essential.

The operation is as follows: The dies being open, the attend ant throws the partially-formed metal cap m into the dies, and as the dies close it is brought certainly and correctly into the central position. As the part B descends it first takes hold of the flat central portion of the shell m between itself and D. As Bdescends farther and D yields a peculiar action commences. The dishing form of the shell m begins to be `reversed by the central portion being depressed, and the shell assumes the form shown in Fig. 3. The furthe'r depression of the central pieces, B D, while the part A stily supports the margin, results in a gradual changing of the form from dishing upward to dishing downward, and the operation, by the successive bending of all portions of the metal simultaneously with the drawing, avoids the severe friction of the blank across the inner upper edge of A which is experienced in the ordinary mode of operating dies.

It will be understood that the springs d under the part D and the springs cover the part C are of sufficient force to eject the formed article withY certainty, but not with sufficient forcev to materially change the form of the shell in the act of bringing the parts together. The part C is forced upward by its gentle contact with the metal of m near the periphery until it rests firmly against the surface E. Then it commences to bcvdepressed with the positive force due to the action of the parts in the last stages of the closing of the dies. The previously-yielding part I) rests firmly on the shoulder shown in the part A and can yield no farther. Thus conditioned, the central portion of the shell is strongly compressed between B and D, and the slight bead represented, or any other device required therein, is sharply produced. At the same time the ring C, having been forced up to its bearingl against the part E', is brought into powerful contact with the upper surface ot' A and perfects the shape of that portion of the article. On the opening of the dies the article is ejected from the lower die by the action of the spring d forcing upward the part D, and it is ejected from4 the upper die by the action of the springs c forcing downward the ring C. The operator holds a stick in one hand, with which he strikes away the now completed and liberated article,

and with the other hand tosses in a fresh shell. Modifications may be made in the forms and proportions of the parts. I can increase or reduce the number of the springs. The rimgE2 may be made in a separate piece from the portion E and E. light duty to perform-that of simply guiding the shell into the correct position. They may be made much lighter than as here shown.

The main dies should be of steel, and of the thickness and strength which the great strain upon them requires; but the parts G and E2 may be of iron or other softer metal, and of various light forms.

The depression in the center of the bed-die, which I have marked A2, may be larger, so as to nearly 0r quite equal in diameter the portion A above, .the press-bed being correspondingly formed to receive it.

Parts of the invention may be used with some success without the whole. When the central portion of the article does not require to be impressed with an annular bead, or with any other device, the part D, with -its guidingstem D', may be dispensed with, and only the spring d, or some equivalent spring device, employed, of sucieut force to throw out the'finished article. When the part Dis used, extending upward to be received in the hollow of the shell, I can dispense with the ring G and its springs g and headed pins F.

I attach much importance to the mode of operation, introducing the shell min the position shown and causing the dies to reverse its primary form, thus producing the finished dish with the surface outside, which was on the inside ot the shell in the partially-dished forni which it presents in the dish m. My experiments indicate that the shell is less liable to burst in the treatment, and that there is less The parts Ez and G have but a IOO IIO

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friction in the operation; but I do not confine the invention entirely to that mode of operar tion. I can succeed with my dies by setting the part D lower, so that it is flush with the top of A, and applying the shell m in the re versed position to that shown-that is to say, with its convex face down and its hollow face uppermost.

I claim as my invention- 1. The modeofoperation described i'orstam p- 3. The yielding ring G, beveled, as shown, surrounding a die or dies, and the beveled lip 0r ring E2, surrounding the opposite die or dies, combined and arranged for joint operation, substantially as and for the purposes herein specied.

4. The bed-die A A A2, central yielding portion, D, with its spring d, and beveled ring G, with its springs g, in combination with each other, and with the moving die B, ring C C', springsr c, actuating-surface E', recessed, as shown, and beveled concentric ring E2, substantially as and for the purposes herein specitied.

In testimony whereofl I have hereunto set my hand, at N ew York city, New York, this 15th day of December, 1882, in the ,presence of two l subscribing witnesses.

PHILIP ELY.

XVitnesses:

W. C. DEY, A. H. GENTNER.

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