US2183287A - Horizontal redraw press - Google Patents

Description

DEC. 12, 1939. 1 P EE 2,183,287

HORIZONTAL REDRAW PRESS Filed ,April 24, 1 937 4 Sheets-Sheet 1 INVENTOR ZenasPGiizdee.

341% ATTORNEQ Dec. 12, 1939. I 2. P. CANDEE HORIZONTAL REDRAW PRESS Filed April 24. 1957 4 Sheets-Sheet 2 INVENTOR Zena: I? azndee.

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Dec. 12, 1939. z C 2,183,287

' HORIZONTAL REDRAW PRESS I Filed April 24, 1937 4 Sheets-Sheet 15 NN 7 WW QU a l M H 1 n d E v 0 3 uv 1v m W.N NW N Om m m M vm 2 mm mi \mm M x OW mm? #M HWUVI MU 8 UQUQFLM H| ||.M 3 I lll J ?h\1 mm ||Fl mm Dec. 12, 1939. z.. CANDEE 2,183,287

HQRIZQNTAL REDRAW PRESS I Filed April 24, 1337 4 Sheets-Sheet 4 lg E [El a, v i 4 a r;

O 8 n m I 8 U INVENTOR A TTORNE V Patented Dec'. 12, 1939 UNITED. STATES PATENT OFFICE 2,183,2'87 HORIZONTAL REDRAW PRESS I I Zenas P. andee, Watertown, Conn, assi gnor to The Waterbury Farrel Foundry &'Machine Company Waterbury, Conn., a corporation of Connecticut 7 Application April 24, 1937, Serial No. 138,702 514 Claims. (01. 113-38) This invention relates to shell drawing presses,.

and more particularly to a horizontal multiple punch and die redraw press in which the cooperating punches and dies act in sequence to) form a completed product from a preformed cup blank-the product from one punch and die set being automatically transferred toithenext succeeding se't.

One object of"this-;invention is' toprovide a multiple redraw -press. of ,the above nature in which the products: drawn at eachj station willf be pushed out efthe'dies and stripped from the punches in such-a manner'that'their closed ends.

' will be in-horizontal alinement to facilitate the v transfer of such' productsfrom staticn to station.

changing the stroke ofsucces'sive punches or re- 1 quiring adjustable power-drivemknock-out rods. Another object is to provide a redraw "press of theabove nature in which all of the punches I are carried by a single reciprocating gate mem-' ber. M I

Still another object is to provide a redraw press of the abovenature having an improved form of rocking product-transfer mechanism whereby the products may be automatically and efiicientlytransferred from one stationto another. 7

' A further ob'jectlfis to provide a redrawpress of the above nature having improved lubricating means whereby each of the individual dies and f punches will be-efliciently lubricated.

- '40 A still' further object is to provide a redraw press of the abovehature which will be relatively simple in construction, inexpensive to manufacture, easy tomanipulate, compact, and very efil cient-anddurable in use. I

,With these and other objects in view-there. has

been illustrated'in-the accompanying drawings one form in which the invention may be conveniently embodied in practice- I In thedrawings:

d Figfl'is a topf ilan view of a. redraw press embodying the features of this invention. 1 Fig 2 is anenlargedqviewpartly in section taken: ontheline 2-2 of Fig; 1, and-showing the feed chuteandtfiansfer mechanism}; 5 Fig. 3 isa fragmentaryenlarged View of some of the. parts shown in Fig. 2 in another position in the operation of the press, the transfer crank armsbeing shown at slightly over 180 degrees from the positions of Fig. 2.

Fig. 4 is an enlargedsectional viewtaken on 5 the line 44 of Fig. 1 through a punch, die, stripper and knockeout rod, and associated parts.

Figs. 5, 6 and '7 are horizontal sectional views vtaken through the die block, and showing the products as they appear duringthe' successive 10 operations of 'drawing, stripping and transferring. Referring now to the drawings in'which like reference characters indicate like parts through ,out the several views, the numeral IO'indicates a main frame in which a crank shaft u .is jour- 1c "naled. The crank shaft [I is adapted to be-rotated by means of a motor lznhaving a driving connection witha cross-shaft l3 having secured thereto a pinion-l4 which is in mesh with a large gear 15 rotatably mounted upon one end of the I) crank shaft I l The press is controlled by a suitable clutch l 6 adapted to be actuated by a handle arm 11 on a shaft I 8 connected by a linklS to the clutch 16, the swinging of said handle arm 11 serving to'operably connect thefgear [Swithjfl the crank shaft H. A common gate 20 is connected to all of the'punches, and is arranged to reciprocate on and between horizontal ways 2| and 22 provided on the opposite side portions 23 and 24 of the frame I 0, respectively. Suitable to connecting rods or links 25 and" are provided "to operably connect the gate 20 with the crank shaft ll. 1 7 ,Statz'ons' v The particular press illustrated is provided'with seven sets of cooperating punches and dies, and

the finalproduct formed thereby is a shell 21 having a closed end 28, as shown at the right of Figs. .6 and 7. Theblank or cup-29'from which the shell 21 is produced is shown-at the left of Figs. 6 and 7. As herein shown, the cups. 29 are deliveredinto the press by a carrier 30, into which said cups are fed by an endless belt 3| andan inclined chute 32. The carrier 3fl is shown in Figs. 2 and 6 in position to receive a cup 29 from 45 the chute 32.this position constituting the first station. Spaced from the chute 32 is a first draw punch. 33 with its cooperating die 34 which constitutes the second station.v Similarly. a second cooperating draw punch 35 and die 36 constitute the third station, a third cooperating draw punch I 31 and die 38 the fourthstation, a fourth cooperating punch '39 and die 40 the fifth station, I a first draw and shoulder punch ll anddie l2 constitute the sixth station, a second draw and shoulder punch 43 and die 44 constitute the seventh station, and a cut-off punch 45 and die 46 the eighth station.

Strippers As best shown in Fig. 1, provision is made of a stripper bar 41 having cup- shaped stripper collars 48, 46, 56, 5|, 52, 53 and 64 secured thereto, said bar 41 being carried between vertical standards 56 and 66 (Fig. 4), which are adjustably connected to the frame I6 by a horizontal crossbar 51 (see Fig. 4). The standards 65 and 66 are attached to the bar 51 by means of T-clamps 66 and bolts 56 after the stripper bar 41 has first been adjusted by means of an adjusting screw 66. Each of the stripper collars 48-54, inclusive, is held in place on the stripper bar 41 by a series of plates 6i and screws 62, and said collars are provided with central openings 66 concentric with the respective punches which are adapted to pass therethrough. v

The dies 34, 36, 36, 46, 42 and 44 are mounted in laterally spaced-apart relation in a horizontal die carrying block 64, said dies being held between pairs of clamping and spacing blocks 65 and 66, each pair being of the proper thickness to locate the respective dies in the desired predetermined staggered positions.

The die block 64 extends across the press and is suitably secured to an end portion 61 of the frame I6, as by bolts 66. Each pair of clamping andspacing blocks 65 and 66 is held in place by a single plate 66 which also extends across the press and is clamped between the die block 64 and the end frame 61 by the bolts 68.

The plate 66 is provided with a plurality of elongated spring enclosing and knock-out rod guiding sleeves 16 (see Fig. 4), each having a threaded portion 1| at one'end screwed into' a suitable threaded opening in the plate 66 in such a manner as to be concentric with each of the die openings. Each of the sleeves 16 is provided with an internal shoulder 12 against which one end of a compression spring 13 abuts,the other end of the spring 13 acting against a tapped col- .lar 14 adjustable upon a threaded knock-out rod 15 which extends through the guiding sleeve I6.

Each of the knock-out rods 16 is provided with a forward reduced extension 16 adapted to engage the closed end 28 of the product being ejected, and said rods are constantly urged in a direction to force said products out of the respective dies. Each of the rods 15 has an adjustable collar 11 screwed upon the rear protruding end thereof, whereby the forward movement of the knock-out rod 15 will be limited by the abutment of the collar 11 against the rear end of the guiding sleeve 16.

Lubricant supply mechanism The die block 64 is provided with a plurality of oil passages 16 leading from its upper surface into the spaces occupied by each of the dies, and the clamping and spacing blocks 65 and 66 are so spaced apart as to provide an annular lubricant groove 16 about the respective die. Suitable radial grooves 16a are also formed in the blocks 68 and 66 to conduct the lubricant from the annular space 16 to both faces of the dies.

In order to-distribute lubricant simultaneously to all of the dies, a plurality of supply tubes 66 are provided to connect each oil passage 16 with a common lubricant manifold pipe 8|, herein shown secured upon the end frame 61 by straps 82. The manifold pipe 6| is, supplied with lubri- Transfer mechanism The product drawn at each station of the press will preferably be transferred to the next adjacent station by means of the mechanism shown in Figs. 2 and 3. This mechanism includes a series of pairs of yieldable shell-gripping fingers 61 and 68 shaped at theirlower ends to fit the curvature of the periphery of the products at the respective stations. The fingers 61 and 66 are provided with inturned upper edges which are fulcrumed in grooves 66 and 66 formed in a depending block 6| secured, as by a bolt 62, to an elongated cross-bar 63. The fingers 61 and 66 are urged toward each other by a pair of opposed compression coil springs 64, each of which is pressed against the respective fingers 61 and 88 and washers 65 secured on rods 66 extending through the fingers 61 and 86 and the block II. Each pair of shell-gripping fingers 81 and 86 are limited in their closing movements by a pair of adjustable screws 61 which are threadingly engaged in the blocks 6i and adapted to be clamped in their adjusted position by a cap screw 66 arranged at right-angles thereto.

Each end of the transfer cross-bar 66 is connected to the outer ends of a pair of crank arms 96 located at the ends of said bar and mounted upon the end of shafts I66 carrying spur gears MI. The shafts I66 (see Figs. 2 and 4) are journaled in a cross-bar I62 secured to the end frame 61, the spur gears I 6| being disposed in a slot I 66 in said cross-bar. A reciprocatory rack I64 is slidably mounted in the slot I66 with its teeth in mesh with the teeth of the two gears I6I, whereby the reciprocation of said rack I64 will intermittently rock the gears I6I and swing the .bar 63, and the sets of fingers 81 and 66 carried thereby, in a semi-circular path from the position shown in Fig. 2 to that shown in Fig. 3, said bar 66 always remaining parallel to the die blocks 64. By means of this construction, it will be seen that the products will be transferred simultaneous'ly from station to station.

The rack I64 is actuated to slide in the slot I68 of the cross-bar I62 by means of a link I66 con-. necting it at one end to a swingable arm herein illustrated as comprising a pair of superposed hook-shaped members I66 and I61 (see Fig. 2) secured together at both ends, and having their lower ends pivoted at I66 to a bracket I66 mounted on the frame I6. The members I66 and I61 are outwardly bowed as at I I6 and III respectively, and each bowed portion is provided with a cam roller H2 and H6. A rotating plate cm I I4 acts against the roller II2 to swing the members I66 and I61 back and forth, thus causing the rack I64 to rock the gears I6I for causing the transfer fingers 81 and 88 and the products held' thereby to moveto the left through an arc indicated by the dotted line in Fig. 3. A similar rotating plate cam H6 acts against the roller I I8 to return the respective parts to the right to their original positions. The cams H4 and II! are adapted to actuate the transfer fingers 81 and 66 rapidly between successive strokes of the punch punches and dies result, the dies are made relatively thin in thicknessand must be disposed in the die block in a es; as will be hereinafter moreufully described.

a slide II9 which is guided upon a bracket I28 secured to the frame I8 The slide 8 serves to transfer the blanks successively from the first station (the feed chute 88),, as shown in Fig. 2. to the second station shown in Fig. 3, into position to be operated on by the punch to force, it through the first die 84. The slideII8 is provided with a cam roller I2I which is urged into'engagement with a rotating cam I22 by a spring I23. One end of-the spring I23 is fastened to a post I24 secured to the bracket I28, while the other end of said spring is connected to a lug I25 depending from said bracket I28. The cam I22 is rigidly secured upon the side shaft H8 and is adapted to move the feed carrier 88 back and forth in synchronism with the movements of the transfer fingers 81 and 88 as described above.

One advantage of the present invention is that while the punches all have the same stroke, the length of the products produced by each set of may increase from station to station.

A further'advantage is that due to the staggered or stepped arrangement of the dies, all of the blanks, when ejected from the various dies, will have their closed ends 28 disposed approximatelyin alinement at the same instant as de-' termined by the cams. 'Allof the pairs of transfer fingers 81 and 88 may thus be located on the samelevel for moving thev products simultaneously from station to station,--'-a far simpler con-.

struction'than would be the case if the transfer fingers were located on various levels.

A further advantage of this novel arrangement is that the transfer fingers will be permitted to carry stepped shell blanks as well as shell blanks of uniform diameter,the blanks being clamped by said fingers while they are being stripped from the punches just after the enlarged portions of the blanks have passed above the line of clamping.

A still further advantage of the present invention is that by arranging the punches horizontally with the. transfer mechanism-above them,

any mutilated or torn shells, clippings,'etc., will be allowed to fall free of the tools, and thus" avoid the possibility of injury thereto. I In order to insure that such conditions will laterally staggered or stepped relation, as shown in Figs. 5, 6 and 7. Moreover, in order to insure proper strippingof the products from the punches,

the stripper collars 48-84, inclusive, must be of different heights-.1 It. will be understood that in all instances, the;.,distance from the face .of each stripper collar (48- 84 inclusive) to the open end,

of the-product at'the end of each drawing operation (Fig. 5) will be substantially the same so thatafter the drawn products have beenejected and stripped," the closed ends of all of the prod-. ucts will lie in anneme tana be spaced from the die block 84, asclearly shown in Fig. 8. The. .fing ers 81 and 88 will thus be permitted to grip the shells at each station'andmove them along the face of the die block in unison. It will also be understood that by staggering or stepping the dies as herein disclosed, it is possible to employ a multiple punch arrangement without requiring individual adjustment of the stroke of each punch and the use of the usual complicated mechanism for this purpose. As clearly shown in Fig. 6, the

' open ends :of each of said shells after ejection willbe held against the respective stripper collars by the springs 18 until all of the punches have been withdrawn from said shells. 'f

Fig, 5 illustrates the disposition of the punches and productsat the end of the punching" stroke.

As therein shown, the feed carrier 88 is at that time holding a new cup 28 ready for the next operation of the press, and the cut-off punch 45 and die 48 has sheared the shoulder portion, I28 from the product 21 of the last draw, by the shoulder punch 43 and die 44. The completed shell 21. is herein shown as being forced out through a tubular chute I28, and the cut-off shoulder portion I28 as falling into a scrap chute I29 (see Figs. land 7).

Fig. 6 illustrates the disposition of the punches andproducts while the former are beingretracted by the gate 28, and the latter are being ejected by the knock-out rods 15. It. will be noted that the closed ends 28 of all of the products are inalinement and lie adjacent the face of the die bar 84 in position to be grasped by the six pairs of transfer fingers 81 and 88.

Fig. 7 illustrates the punches in full retracted position, at which time the transfer fingers 81 and 88 will have completed half of their movement of transferring the products from station to station. The carrier 38 is also shownwith its movement toward the second station position to present another cup 28 to the first punch...

partly completed.

, Operation In operation, a series of blanks or cups 2.8, will be placed successively upon the belt 3|, from which they will gravitate down the chute 32 and fall upon the carrier 38. While the punches re-,.

main in retracted position, the crank shaft and the cams I22 and H4 will operate upon the feed slide 8 and the reciprocating rack I84 to move the carrier 88 to the left, as viewed in in suchpositions by the springs 13. The cam H5- will then act upon the rack I84 to swingthe fingers in a semi-circular arc with the products carried thereby, into alinement'with the neitt succeeding station, depositing said products at said station before the next stroke of the punches commences. As will be noted by reference to Fig. 3, the path followed by the products while;

they are being transferred in this manner from one station to another will be somewhat more than degrees, thus obtaining the advantage.

of a substantial vertical movement of the fingers 81 and 88 at each station, whereby the fingers in one instance may spring-snap over the products, and in the other, spring-snap away from the same. If desired, the action of the mechanism may be so timed that the gripping transfer fingers will not be withdrawn fromthe s'hells until a short time after the punches have entered said shells on the next succeeding punching I stroke, but before any movement of the shells has taken place.

When the next stroke of the punches takes place, the products will be engaged thereby and forced through the dies the desired amount, and the knock-out rods will be pressed inwardly against the springs 13, compressing the same, as

shown in Fig. 5. The closed ends 28 of each product will be carried by each punch a sumclent amount through and beyond the respective die to completely draw the product, the staggering of the dies permitting the products to be drawn to the lengths desired. During the retraction of the punches, the knock-out rods 15 will follow the shells out of the dies horizontally under influence of the springs 13,'forcing the products backwardly until said knock-out rods reach the limit of their movement ascontrolled by the stop collars TI abutting the outer ends of the sleeves 10. The open ends of the products will then engage the respective stripper collars 48-44, as shown in Fig. 6. Continued movement of the gate will strip all of the punches from said products, so that they may be transferred to the next stations, as shown in Fig. 7.

A further advantage of the present invention is that by maintaining the punches at a low temperature, the shells are cooled between the successive draws, thus reducing the amount of hardening which will take place during the passage of the shells through the machine.

While the present invention has been described as a horizontal redraw press, it will be understood that it is within the scope of the invention to employ the same construction herein disclosed in a redraw press arranged in a vertical or any other desired position.

While there has been disclosed in this specification one form in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure, but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all of the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new, and for which it is desired to secure Letters "Patent, is:

1. In a multiple redraw press, a die block having aplurality of stag ered dies, the front faces of said dies being offset inwardly at varying distances from the front face of said die block, a plurality of strippers staggered in the same relation as said dies, means to eject the products drawn in each die, a plurality of pairs of cooperating fingers adapted to simultaneously grip the products ejected from each die, means to cause said fingers to grip said products during the stripping action, and means to move all of said pairs of fingers in a semi-circular arc in a single plane from a position in front of one die to a position in front of the next succeeding die.

2. In a multiple redraw press, a plurality of spaced-apart parallel punches arranged in a row, a gate for reciprocating all of said punches in unison, a die carrying block, a plurality of dies in alinement with the axes of said punches, a plurality of pairs of spring-pressed cooperating fingers to resiliently'grip the products formed in each die, and a cross-bar carrying all of said pairs of fingers and swingable in an arc of substantially 180 degrees from a position in front of one die to a position in front of the next succeeding die, crank arms pivotally connected to said cross-bar, and pinion and rack means for rocking said crank arm to swing said cross-bar.

3. In a. multiple redraw press, a plurality of sets of cooperating punches and dies adapted to operate successively upon tubular blanks fed to said press, a cross-bar carrying a plurality of pairs of gripping jaws arranged to swing parallel to itself in an arc of substantially 180 degrees to transfer said blanks from station to station, spaced-apart rotatably-mounted pinions, a pair of crank arms pivotally connected to said cross-bar and pinions, a rack for driving said pinions, and rack operated means for swinging said bar back and forth between successive drawing operations.

4. In a multiple redraw press, a plurality of sets of cooperating-punches and dies, a cross-bar, means to swing said cross-bar parallel to itself in an arc of substantially. 180 degrees, a plurality of spaced blocks mounted on said bar at right-angles thereto,. a plurality of inwardly spring-pressed gripping fingers connected to said blocks for resiliently holding the products drawn in said dies while transferring them from station to station.

5. In a multiple redraw press, a plurality of sets of cooperating punches and dies, a crossbar, means to swing said cross-bar parallel to itself in an arc of substantially 180 degrees, a plurality of spaced blocks mounted on said crossbargand extending at right-angles thereto, a plurality of spring holding cross-rods, one carried by each block, spaced from said bar, a plurality of pairs of gripping fingers straddling said rods, and a spring carried by each cross-rod to engage each finger, said fingers being fulcrumed in the opposite sides of said blocks for resiliently holding the products drawn in said dies while transferring them from station to station.

6. In a multiple redraw press, a plurality of sets of cooperating punches and dies, a crossbar, means to swing said cross-bar parallel to itself in an arc of substantially 180 degrees, a plurality of spaced blocks mounted on said crossbar and extending at right-angles thereto, a plurality of inwardly spring-pressed gripping fingers connected to said blocks for resiliently holding the products drawn in said dies while transferring them fromstation to station, and adjustable stop means mounted in said blocks for limiting the inward movements of said fingers.

7. In a multiple redraw press, a plurality of sets of cooperating punches and dies, a crossbar, means to swing said cross-bar parallel to itself in an arc of substantially 180 degrees, a plurality of spaced blocks mounted on said crossbar and extending at right-angles thereto, a plurality of inwardly spring-pressed gripping fingers connected to said blocks for resiliently holding the products drawn in said dies while transferring them from station to station, ad-

itself in an arc of substantially 180 degrees, a

- transferring them from station to station, and

adjustable stop screws mounted in said blocks for being vertically disposed and each having an opening to be entered by said punches, a die block. die clamping blocks in said die block and each arranged to provide an annular space about the die clamped thereby, a radial groove provided in each die clamping block in connection with the annular space about the die and leading therefrom to the punch entering the opening in the die, and means to force lubricant into the spaces about said dies to lubricate the dies and punches. v

10. In a multiple punch press, a plurality of horizontally reciprocable punches, dies cooperating withv said punches, the faces of said dies being vertically disposed and each having an opening to be entered by said punches, a die block, die clamping blocks in said die block and each arranged to provide an annular space about the die clamped thereby, a radial groove pro- .vided in each of said die clamping blocks in connection with the annular space about the die and leading therefrom to the punch entering the opening in the die, and means to force lubricant into the spaces about said dies to lubricate the dies and punches, an outlet opening formed in said die block below said dies to permit the lubricant to exhaust downwardly from the space about the same and flush dirt and chips therefrom.

11. In a multiple redraw press, a plurality of cooperating punches and diesarranged in a row disposed in a horizontal plane across the press and adapted to operate in succession upon tubular blanks fed to said press, a transverse die-' carrying block, means clamped to said block for holding the individual dies ofl'set at varying distances from the face of said block comprising a plurality of pairs of spaced die clamping blocks embracing said dies and providing an annular space about each of said dies, a common plate member for supporting all of said pairs of die clamping blocks, each of said die clamping blocks having a radial groove in its face abutting the die held therebetween in connection with the aforesaid annular space about said die, and means to supply lubricant to the annular spaces between said die clamping blocks and to the radial grooves in the face 01 said dies.

12. In a multiple redraw press. a plurality of cooperating punches and dies arranged in a row disposed in a horizontal plane across thepress and adapted to operate in succession upon tubular blanks fed to said press, a transverse -die'- carrying block. means clamped to said block for holding the individual dies offset at varying distances from the face of said block comprising a plurality of pairs of spaced die clamping blocks embracing said dies and providing an annular space about each of said dies, a common plate member for supporting all of said pairs of die clamping blocks, each of said die clamping blocks having a radial groove in its face abutting the dieheld therebetween in connection with the aforesaid annular space about said die, a manifold connected to a source of lubricant supply under pressure, and a plurality oftubesconnected to said manifold for directing lubricant individually to the annular spaces about and the radial grooves in the face of each of said dies.

13. In a multiple redraw press, a reciprocating gate, a plurality of punches mounted in said gate and arranged in a row, the free ends of said punches being substantially in the same plane, a plurality of dies for cooperating with said punches and arranged in a row,,the 0perating faces of said dies being stepped in respect to said plane, a plurality of strippers, one for each of said corresponding punches and dies, said strippers being stepped in substantially the same relationship as the operatingfaces of the corresponding dies, so that the distance between the operating face of each die and its corresponding stripper will be substantially uniform.

14. In a multiple redraw press, a plurality of reciprocating punches having the same strokes arranged in a row, the free ends of said punches being substantially in the same plane, a plurality of dies for cooperating with said punches and arranged in a row, the operating faces of said dies being stepped in respect to said plane, a plurality of strippers, one for each of said correspending punches and'dies, said strippers being be substantially uniform.

, ZENAS P. CANDEE.

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