US1275614A - Double-acting drawing-press. - Google Patents

Description

H. B. SHERMAN.

DOUBLE ACTING DRAWING PRESSK' APPLICATION FILED 0612f 1911.

1,275,614. Patented ug. 1 3, 1918.

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H. B. SHERMAN.

DOUBLE ACTING DRAWING PRESS.

APPLICATION FILED 00125. 1911.

Patented Aug. 13, 1918.

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UNITED STATES PATENT ornron HOWARD IB. SHERMAN, OF BATTLE CREEK, MICHIGAN.

DOUBLE-ACTING DRAWING-PRESS.

Application filed October 5, 1917. Serial No. 194,903.

To all whom it may concern Be it known that I, HOWARD B. SHERMAN, a citizen of the United States, residing at Battle Creek, in the county of Calhoun and State of Michigan, have invented certain new and useful Improvements in Double- Acting Drawing-Presses; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanyingdrawings, which form part of this specification.

This invention is an improvement in drawing presses, and its object is to reduce the expense of manufacturing drawn metal-objects, and increase the product by enabling an ordinary double-acting drawing press to automatically perform a plurality of drawing operations upon material; and this object I attain by providing such a press with novel and simple means whereby after the blanking and first drawing or forming operation, the shell may be automatically transferred to another point and subjected to a second drawing operation or redrawn; the drawing operations being preferably performed sin gikaneously, and the transferring of the shel taking place intermediate the successive drawing operations thereon.

The invention enhances the product of double-acting drawing presses by enabling them to perform a plurality of operations for each reciprocation of the plungers or slides, and I will hereinafter explain one practical embodiment of the invention as applied to a known type of drawing press, as illustrated in the accompanying drawing, which will enable others to clearly understand the invention and apply it to other types of presses; and in the claims the novel features, constructions and combinations of parts for which protection is desired are summarized.

In said drawings:

Figure 1 is a front elevation of a doubleacting drawing press with my invention applied thereto. I

Fig. 2 is an enlarged detail vertical section through the lower portion of such press showing the blanking and drawing devices.

Fig. 3 is a vertical section *on the line 3-3, Fig. 2.

Fig. 4, a vertical section on line M, Fig. 2.

The invention is applicable to various forms of double-acting drawing presses, and in the drawingI have shown the invention which is guided in suitable Specification of Letters Patent. Patented Aug. 13, 1918;

as applied to a known type of drawing press which llaSa vertically moving main plunger or outside slide 1, and a secondary plunger or inside slide 1, which slides are 1 operatively connected with and actuated in proper times by the main shaft 1 the parts of such press may be constructed and arranged to operate in the usual manner, and need no particular explanation'herein,

On the bed l of the press is formed or mounted a member 2 which is provided with longitudinal guides for a slide 6 hereinafter referred to, and is also provided near one end with an opening 2 in which is fitted a redrawing die 3 This die 3 is preferably arranged below the plane of the slide 6 and cooperates with blank-holding and drawing devices hereinafter referred to. Adjacent the redrawing die 3 but preferably above the plane of the slide (3 the member 2 is provided with a projection or step 2 having an opening 2 communicating with the slideway; and at the upper end of said opening is a drawing die 3 and above this die 3 is a blanking die 3. This drawing die 3 and vblanking die 3 I cooperate with drawing and blanking means hereafter referredto. Above the die 3, and attached to the step 2 is a stock guide and stripper 8, which may be of the usual construction.

Attached to the lower end of the main or outer slide 1 is a casting l to which is attached a male blanking die 4! adapted to coact with the blanking die 3 to cut a blank from a strip of metal fed through the guide 8. The male blanking die 4' is tubular,and through it extends a drawing punch 5, which also extends through an opening in the casting 4 and is attached to the inner slide 1 by a set screw 5 01 other suitable means.

The casting 4 as shown is provided with a depending portion 4 which is above the die 3 and to this portion 4 is attached an inside blank-holder 4 which is adapted to hold or position the blank during the second drawing operation. This blank-holder is tubular and through it operates a drawing punch 5 which is adapted to coact with the redrawing die 3*, and is attached to a holder 5 which is in turn secured to the inner slide 1 by a set screw 5 or other suitable means.

Mounted beneath the die 3 and extending transversely of and beneath the dies 3, 3 and preferably over the die 3 is a slide 6, ways or slots in the member 2 or baseof the machine. This slide is provided with a pocket 6 which is adapted to receive the drawn shell or cup ejected from the die 3, and move it into position over the die 3* to be engaged by the holder r preparatory to being redrawn, and the slide is retracted in time to have its pocket 6 receive the cup delivered from die 3 upon the completion of each first drawing operation.

The slide 6 may be operated by any suitable means. In the example shown said slide is pivotally connected at its outer end by an adjustable link 6 to the lower end of alever 7 which is pivoted at 7 on a bracket 1 attached to the frame of the press, and the upper end of lever 7 carries a roller 7 which engages the cam groove 7 of a cam 7 attached to the shaft 1 so that the slide 6 is operated at the proper times and in relation to the movements of the slides 1 and l The parts are preferably so arranged and operated that as the slides l and 1 descend the male blanking die r first cooperates with the blanking die 3 and cuts a blank from the stock fed through the guide 8, and then holds such blank over the die 3 while the inner slide continuing to descend causes the punch 5 to engage suchblank and draw it through the die 3 converting it into a cup, which cup is dropped through the opening 2 onto the slide 6, and into'the pocket 6; and upon the ascent of slide 1 such cup is positioned over the die 3*. Upon the descent of the main slide 1 such a previously drawn cup positioned over the die 3" by the action of the slide 6 is engaged by the blank holder 4: and held llrpOSltlOIl over the redrawing die 3 and as the inner slide descends and punch 5 draws another blank through the die 3*, the redrawing punch 5" also engages and forces the previously drawn cup through the die 3', redrawing said cup, and discharging same through the opening 2 The slides 1 and 1 are preferably so operated that the outer slide first moves down to cause the cutting of a blank from the stock and holds such blank over the die 3*, and holds a previously drawn cup over the die 3"; then the inner slide descends and causes the punch 5 to draw the blank through the die 3, and simultaneously the punch 5 redraws the previously drawn cup through the die 3"; then the inner plunger ascends and the blanks are stripped from the punches 5 and 5 by the drawing die n and the inner blank-holder r respectively; then the outer slide 1 rises. The slide 6 is then moved inwardly so as to carry the just-drawn cup from beneath the die 3 to and over the die 3*, so that at the next descent of the slides 1 and 1 another blank will be cut and drawn, and the previously drawn cup will be redrawn.

In the ordinary operation of drawing presses the blank is cut and then drawn into a cup, and this cup then has to be manually fed into a second press Where it is redrawn. Such operations are expensive in that they require manual feeding of the cups between the drawing operations. Y

By my invention the one press is enabled to perform two successive drawing operations without any manual. teedin for as above explained, the machine automatically cuts a blank from the stock, draws the same into a cup, automatically moves such cup from the first drawing die into position to be operated upon by the second drawing die, and the cup is automatically drawn and redrawn before it is discharged from the machine.

By this invention 1 can lessen the labor, reduce the number of presses and the number of manual operations usually required, increase the speed of operation, and decrease the cost of manufacture of articles made from the shells.

Preferably the second drawing die is ar-.

ranged in a plane beneath the first drawing die, as by so doing I am able to transfer the cup from the first drawing die to the second in the simplest and most direct man ner. I do not, however, consider the invention restricted to the peculiar arrangement and construction of the parts illustrated in the drawings. By this invention I am able to convert a double-acting press ordinarily performing only the operation of blanking and first drawing into a rcss capable of blanking, drawing, and redrawing at each operation, and in the same time previously required to perform merely the blanking and one drawing operation.

I claim:

1. In a double acting drawing press, the coi'nbination of slides, a member carried by one of the slides and having a depending portion, a male blanking die attached to said member, and an inner male blank holder attached to the depending portion, a plurality of drawing punches attached to the other slide and operating through said member, one punch passing through the male blanking die and the other punch through the male blank holder, another member having a redrawing die, said redrawing die being positioned beneath and adapted to cooperate with the male blank holder carried by the depending portion, a projection on said last named member, a blanking and a drawing die attached to said projection, said blanking die being adapted to cooperate with the male blanking die of the first named member, said drawing dies being located in position on said last mentioned member to cooperate with the drawing punches.

2. In a double-acting press, the combination of slides; a member attached to one of the slides and having a depending portion;

a blanking die carried by said member beside the depending portion; a blank holder attached to said depending portion; another member having a projection; a redrawing die on said member beside the projection and cooperating with the blank holder on the depending portion of the first named member; a blanking die and a drawing die attached to said projection, the blanking die cooperating with the blanking die on the first member; and drawing punches attached to the other slide one punch operating through the blanking dies with the drawing die and the other punch operating through the blank holder with the redrawing die.

3. In a double acting drawing press, the combination of slides, a member attached to one of the slides and having a depending portion, a blanking die attached to said member, a blank holder carried by the depending portion, a plurality of drawing punches attached to the other slide and operating through said member, another member having a redrawing die located beneath and adapted to cooperate with the blank holder, a projection on said member being provided with a drawing die adapted to cooperate with the die of the first named member, said last named member having a guide way therein extending beneath the drawing die of the projection and over the redrawing die, and a reciprocating slide operable in said guideway for transferring cups from the drawing to the redrawing die.

at. In a double acting drawing press, the combination of slides, a member carried by one of the slides and having a depending portion, a blanking die attached to said member beside the depending portion, and blank holder attached to the depending portion of said member, a plurality of drawing punches attached to the other slide and operating through said member, one punch passing through the blanking die and other punch through the blank holder; a second member having a projection, a redrawing die on said second member positioned be neath and adapted to cooperate with the male blank holder carried by the said depending portion; a blanking and a drawing die on said projection, said blanking die being adapted to cooperate with the blanking die of the first member, and said drawing dies being located in position on said second member to cooperate with the drawing punches.

5. In a double-acting press, the combination of slides, a member attached to one of the slides having a depending portion; a blanking die carried by said member adj acent the depending portion and a blank holder attached to said depending portion; a plurality of drawing punches attached to the other slide and operating through said member, one of the punches passing through the blanking die and another through the blank holder; another member supported beneath the first member and having a projection thereon,a blanking die attached to said projection and cooperating with the blanking die on the first named member; a redrawing die on the second member beside the projection cooperating with the blank holder of the depending portion of the first named member, and dies on said second member cooperating with said punches.

6. In a double acting drawing press, the combination of slides, a casting attached to one of the slides and having a depending portion, a blanking die attached to said casting beside the depending portion, a blank holder carried by the depending portion; a plurality of drawing punches attached to the other slide and operating through said member; another casting supported beneath the first and having a redrawing die located beneath and adapted to cooperate with the blank holder, said second casting having a projection, a drawing die on said projection adapted to cooperate with the blanking die of the first named casting, said last named casting having a guide way therein extends ing beneath the drawing die of theprojection and over the redrawing die, and a reciprocating slide operable in said guideway for transferring cups from the drawing die to the redrawing die.

In testimony that I claim the foregoing as my own, I afiix my signature.

' HOWARD B. SHERMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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