US2211009A - Metalworking machine - Google Patents

Description

Aug? 13, e' c CGROTNES I 2 L009 METALWORKING MACHINE Filed April 25, 1938 4 Sheets-Shet 1 Grpo/nes g- 13, c. c. Rb NEs 221L00 METALWORKING MACHINE 7 Filed Apri1 25, 195a 4 Sheets-Sheet? womzys Aug. 13, 1940.

I C. C. GROTNIES MEI'ALWORKING'MACHINE :Fiied April 25,1938

4 Sheets-Sheet 4 NVELNTO Qd Carl C? Grofn c/l'rToragsys IIIIIIIIIIIIIIIIIIIIIIII object the prbvision' of a unitary machine for not only edging the blank but also forminga Patented-Aug 13, 1940 UNITED STATES PATENT. OFFICE 15 Claims.

The invention relates to machines for shaping sheet metal articles such, for example, as cylindrical shells or blanks used in making pails, buckets and the like, and has for its principal bead therein all as part of a single operation.

A further object of the invention is to provide a combined roll edging and beading machine for operating on cylindrical metal blanks in which the respective edging and beading dies are operated in timed relation to shape the blank expeditiously and economically.

Another object of the invention is to provide in a cylindrical blank shaping machine an improved transfer mechanismv for automatically presenting successive blanks to the shaping dies;

The invention also resides in various structural improvements in the mechanism for stripping the go shaped blanks from the dies.

Further objects tion will become apparent from a consideration of the following description taken in conjunction with the accompanying drawings in which:

Figure 1 is a perspective view of a metal working machine embodying the invention.

Fig. 2 is a perspective view of one of the finished blanks after it has been operated on by the machine in Fig. 1.

. Fig. 3 is an enlarged longitudinal sectional view 5 line 5-5 in Fig. 3 illustratingparticularly the transfer mechanism with a series of work blanks v along the line 3 3 in Fig. 1.

Fig. 4 is a vertical sectional view along the line 4-4 in Fig. 3. I

Fig. 5 is a longitudinal sectional view along the in position thereon.

Figs. 6 and '7 are enlarged fragmentary front elevations of the die head with the heading, die

in respectively contracted and expanded positions.

Fig. 8 is a detailedprespective view of one of the die blocks included in the heading die.

Fig. 9 is a detailed transverse sectional View along the line 9-9 in Fig. 3.

For purposes of illustrationof its various novel features, the invention has been. shown and described herein as embodied in a machine for forming a rolled edge l0 and annular bead ll 0 in cylindrical blanks l2 (Fig. 2) such as are used in fabricating pails for paint and the like. It will be apparent to those skilled in the art, however, that the invention is applicable in many of its aspects to machines for shaping other arti- 55 cles. In general, the particular machine illusand advantages of the inventrated (Fig.1) embodies a bed l3 on which is mounted an axially reciprocable die breast or head ll carrying a circular roll edging die l5 and -an expansible beading die IS on its forward end. Plain cylindrical sheet metal blanks are presented to the dies in axial alinement with the head therein. The beading die I6 is then retracted I out of engagement'with the blank and the head l4 returned to its initial position. The transfer mechanism II serves to present successive blanks to the dies in timed relation with the'die head movement so that the machine operates entirely automatically. 1 r

The edging die l5 (Figs. 4 and 6) has been shown in the form of a ring-shaped plate bolted to the forward end of the diehead and provided with an annular groove I9 which receives the forward edge of the cylindrical sheet metal blank l2. As the head. l4 advances to the position shown in Fig. 4 the blank is forced against the stop l8 so that the forward edge of the blank is curled outwardly and back by the groove. l9

as shown in Fig. 4, to form a suitably rolled reinforcing or strengthening edge I0 on the blank. If the stop I8 is used simply as anabutment and guide it may have a plain flat surface. In the event, however, that it is desired to expand the outer edge of the blank in flange form to shape it for the connection of a bottom wall member as indicated at l0, a truncated cone-shaped projection 20 (Fig. 4). In such case the stop l8 and projection 20 serve as a second opposed edging dieand the opposite ends of the blank are shaped simul-.

is provided on the face of the stop [8 ll in a circular 22 (Fig. 8) is provided with radially extending grooves 23 in its opposite faces which receive complemental projections or guide ribs 24 (Fig. 7) on a circular retaining plate 25 and on the face of the ring-shaped edging die 15. The retaining plate 25 is mounted in spaced relation to the front of the edging die l5 by series of through bolts 26 surrounded by spacing collars 21. Retention of the segmental beading die blocks 22 in their normally retracted positions is effected by a circular helical "spring 28 positioned in annular grooves 29 in the outer ends'of the blocks. When in its retracted condition the beading die is of suiiiciently small diameter that it may be moved freely into the interior of the blank.

For the purpose of forcing the beading die blocks 22 radially outward into engagement with the blanks, a cone-type actuator is employed. For this pu pose a cone 30 (Fig. 3) is secured to the outer end of an axially reciprocable draw bar 3| slidably supported in a central bearing sleeve 32 bolted within an axial bore 33 in the head l4. To accommodate the actuator the die l5 has a central opening Ii alined with a counterbore 33' in the face of the head l4. The conical surface of the actuator 30 has flattened bearing surfaces for engagement with the inner ends of the repective die blocks 22 so that when the actuator is thrust outwardly from the position shown in Fig. 4 to the position shown in Fig. 3, the die blocks 22 are correspondingly moved outwardly from their retracted positions (Fig. 6) to their radially or laterally projected positions (Fig. '7). I

The head l4 constitutes a reciprocatory slide upon which the twodies i5 and II are mounted for movement axially of. the work. To form the rolled edge and the bead, the two dies are operated in a predetermined timed'relation, the arrangement being such that as an incident to the movement of the die I 5 with the head to form the rolled edge, the die II is positioned for subsequent radial expansiomby an independent movement of the actuator 30 relative to the head to form the bead. In the present instance the head is of generally cylindrical contour and is supported for axial movement on the bed ll of the machine through the medium of axially extending side ribs 34 (Figs. 3 and 9) disposed in guideways so formed by the bed and by retaining plates ll.

These retaining plates are bolted to the sides of the bed and are provided with flanges 3! overlying the ribs 34 on the head.

Timed sequential actuation of the dies and their supporting head is eflected by a driving mechanism which serves in general first to advance the head i4 to the position shown in Fig. 4, in which the edging die I! engages the blank l2 and forms a rolled edge thereon, second, to expand the heading die into engagement with the blank as shown in Fig. 3, third, retract the bead-= ing die toits initial position, and finally, retract both of the dies out of engagement with the blank and return the head I 4 to its initial position. This power actuated mechanism includes a pair ofgears 31' (Fig. 3) iournaled in the bed ll'on shafts 3| and connected by an eccentriccrank pin 38, the gears being driven by an electric motor (not shown). Fixed on the outer faces of the gears 31 areperipheral cams 4| engaged by cam iollower rollers 'journaled on head l4. The thrust exerted by these cams on the followers '4l ad vances the head 14 from itsinitial position to its fully projected position (Fig. 4). The cams are contoured so that a period 01' dwell follows in reciprocation oi the rack il.

which the head l4 remains stationary. During this dwell, the movement of a pitman ,4! connected between the eccentric crank pin ll and the draw bar 3| projects the cone shaped actuator outwardly with respect to the head sothat the heading die is thrust into engagement with the blank. Further movement of the pitman 42 during the dwell period retracts the draw bar II to its initial position so that the actuator ll is again in the position shown in Fig. 4 at the completion of the dwell. The spring 28 thereupon contracts the beading die to its initial diameter.

In addition to their function in actuating the beading die 16, the cone-shaped actuator 30 and the associated driving connections also serve to positively retract the head l4. Thus, upon continued rotation of the gears 31 to their initial position, the head I4 is pulled to its starting position by the pitman 42 and draw bar 3i due to the engagement of the rear face of the actuator I} with a shoulder) 43 (Fig. 4) at the bottom-of the counterbore 33. It will be understood that if desired more than one set of heading dies may transverse to the line of reciprocation of the die carryinghead l4, and for locating successive blanks in operative alinement with the dies. In the construction illustrated a plurality of blanks II are advanced simultaneously by a series of pushers 48-50 carried on a horizontally reciprocable rack ll. These pushers are tiltably mounted on the rack so that they can be depressed and slid under the blanks on the return stroke of the rack (to the left as viewed in Fig. 5) and then raised into pushing engagement with the blanks (as shown in Fig. 5) on the opposite or advancing stroke of the rack. A common drive mechanism. hereinafter described in greater detail, is utilized-for reciprocating the rack II and for tilting the pusher-s "-0-" so that the reciprocating and tilting motions of the-pushers willoccur in timed relation. As shown, the rack is formed of spaced channels I! (Fig. I) joined by webs I3 and Journaled on rollers 54 secured to the machine bed I} by brackets i4.

Fresh blanks I! are rolled onto the transfer mechanism by a pair of spaced stationary inclinedrunways 55 (Fig. 5) having notches II in their upperv surfaces for receiving the blanks at sequential points in their step by step progress. The pushers 48-0-5! advance the blanks from one notch tojhe next upon each To support a blank in operative alinement with the head i4 the last pusher II in the series is notched out at to cradle and receive a blank forced against it by the next adjacent pusher 4!. These two pushers 4! and it thus cooperate to hold the blank against lateral displacement while it is being operated upon by the dies.

1 Movement of the blanks II transversely with I I4. These guide plates presentsmooth fiat surwork 58 surrounding the forward end of the head faces spaced a distance from the abutment l8 substantially equal to the length of the blanks.

being operated upon. To guide the blanks l2 into the space between the plates 51 and abutment l8 the leading edge 51* of the first of the plates 51 is bent out so that the blanks will slide transversely of the rack 5| into proper position if they are located too close to the head" M as they move onto the machine. This guiding mechanism also includes a horizontal guide bar 59 pivoted on the frame 58 at 60 and adapted to ride over the tops of the blanks as they move into position in front of the head M. The-weight of the pivoted bar 59 forces the blanks down against their supporting pusher so that they will be accurately alined with the dies.

In order to coordinate the actuation of the transfer mechanism H with that of the die head M,- they are preferably driven from the same prime mover. In the machine shown a lever 6| lower ends to a rod 65 (Fig.' 5) slidable in the rack, the outer end of this rod being connected to the oscillating drive lever 6| through alink 56. The lost motion connection of the rod 65 to the rack is formed by spaced collars EST-68 fast on the rod 65 and engageable with the opposite faces of the transverse rack web 53. The first part of the inward stroke of the rod"65 to the left (as viewed in Fig. 5) tilts the pushers 38-'-595ll downwardly and then the engagement of the collar 611 with the rack web 53 shifts the entire rack and pusher assembly inward during the remainder of the stroke. Since the pushers are thus depressed below the'level of the blanks 92 they pass freely under them during this inward stroke of rack and pusher assembly. Similarly, the first part of the outward stroke of the rod (to the right as viewed in Fig. 5) tiltsthe pushers -'?l8- 35l5 upward again and then the engagement of the other collar 68 with the rack web 53 shifts the rack and pusher assembly outwardly to its initial position. During this outward stroke the .raised pushers' engage. the

, blanks and move each of the series one step forward. In this manner the blanks are positively advanced step by step to operative engagement with the dies 3-45, and upon completion of the die forming operation the finished blanks are pushed from the machine by thelast pusher 50. In order to prevent premature movement of the rack 5| a friction plate 69 (Fig. 1 is preferably secured to one of'the channels 52-to en-' gage. the rollers 5d when the rack 52 is in its extreme inward position (to the left as viewed in Fig. 1) so that only a positive pull by the collar 68 on the rack web 53 will dislodge thejammed plate 69 and permit the rack 5i to move out wardly.

Stripping of the finished blanks ig from the dies I5-i'6 is accomplished by the horizontal guide bar 59. This guide bar rides on the top of the blank between the rolled edge l0 and bead ll so that when the die head It is retracted the stationary bar 59 will engage the bead I l and thereby strip the blank from the dies in the event that the blank tends to adhere to the die l5. Accordingly the finished blank is readily ejected from the machine by the next pushing stroke of the pusher 50.

The guide mechanism may also be utilized to strip the shaped blank from the flange forming projection 20 on the abutment III in the event that such a'forming abutment is used. For this purpose the guide supporting frame 58 is carried by a pair of bars I0 journaled for horizontal sliding movement in lugs ll projecting from the bed side plates 35 (Fig.1). Adjustable collars I2 and 13 on the rods 10 are engageable by lug H on the side of the head M which projects through a slot 15in one of the side plates 35. With the collars l2 and 13 positioned as shown in Fig, 1, the guide frame 58 will, of course, remain stationary while the head is reciprocated. When' it is desired to use the guide mechanism to strip theblanks from the stop Hi, the collar 13 is moved along the rod I0 away from the adjacent projection H and made fast to the rod in this adjusted position. Then the return or retractive stroke of the head l4 will cause the lug 74 to engage the collar 73 so that the entire guide frame58 will be retracted during the final portion of the head return stroke.

This retractive movement ofthe guide frame causes the horizontal guide bar 59 to engage the rolled edge I!) formed on the forward end of the finished blank and thereby pull the blank-free of the projection 20 on the abutment l8. Similarly, on the next advancing stroke of the head l4 the lug M engages the other collar 12 so as to return the guide frame to its normal working position for engagement wlththe next blank presented to the machine.

Although a particular embodiment of the invention has been shown and described in some detail for purposes of illustration, there is no intention to thereby limit the invention to such preferred embodiment but, on the other hand, the appended claims are intended to cover all modifications within the spirit and scope of the invention.

'I claiin as my invention:

1. In ,a machine of the character described,

means for supporting a cylindrical metal shell, a

- die head reciprocable toward and away from said support axlallyj of a shell thereon, a roll edging die and a beading die carried by said head, a first power actuated means for advancing said head toward said support to engage the blank by said edging die with a period of dwell at the end of said advance movement, and a second power 4 actuated means operable in timed relation with the first for moving said beading die into and out of engagement with the blank during said period of dwell and for thereafter returning said head to its initial position.

2. In a machine of the character described,

means for supporting a cylindrical metal shell, a

die head reciprocable toward and away from said support axiallyof a shell thereon, a ring shaped roll edging die carried on the front'face of said head, a radially expansible beading die disposed on said head forwardly and centrally of said edging die; a first power actuated means for advancing said head toward, said support to engage the blank by said edging die with a period of dwell at the end of said advance movement, and a second power actuated means operable in. timed relation with the first for expanding the inserted beading die into engagement with the blank and contracting the same again during said period of dwell and for thereafter returning said head to its initial position.

' 3. In a' machine of the character described, means for supporting a cylindrical metal shell, 8. die head, means for effecting relative traversing movement between said head and support axially of a shell thereon, an edging die on said head en gageable with the adjacent edge of the shell, said support including an abutment at the end of the shell opposite said head and cooperable with the latter to clamp the shell therebetween, a beading die also carried by said head and positioned forwardly of said edging die within the shell when said edging die is positioned in engagement wth the shell, and means for actuating said beading die laterally into engagement with the shell in' timed relation with the relative movement between said head and support and after the shell is clamped by said head and support.

4. In a machine of the character described means for supporting a cylindrical metal blank,

' a die head traversable toward and away from said support axially of the blank and having a bore therein alined with the axis of the blank, said supporting means including an abutment bearing against the end of the blank opposite said head, a ring shaped edging die on the forward end of said head encircling the end of said bore, and engageable with the blank to clamp the same against said abutment, an expansible beading die on the forward end of said head and imertable into the blank, an actuator for said expansible beading die projecting through said bore, and power actuated means for moving said head and actuator in timed relation.

5. In a machine of the character described, means for supporting 'a cylindrical metal blank, a die head traversable. toward and away from said support axially of the blank and having a bore therein alined with the axis of the blank, a ring shaped edging. die on theforward end of said head encircling the end of said bore, an expan-' sible beading die in the forward end of said h'ead and insertable into the blank, actuating means for said beading die including an axially 'slidable draw bar in said bore, means including a rotatable cam for advancing said head toward said support with a period of dwell at the end of the advance, means for projecting said draw bar forwardly of said head to expand said beading die 'and for returning said draw bar through a full return stroke equal to the advance of said head, means on said head engageable by said bar to efiect a withdrawal of said head by the return stroke of said draw'bar, and common power actuated means for driving both said head advancing means and draw bar.

6. In a machine of the character described, means for supporting a cylindrical metal shell and including an abutment engageable with ofie end of the shell; an edging die; a beading die;

and power actuated means for simultaneously advancing said dies to a position in which said edging die engages the shell and the other does not, retaining said edging die. in such position for to their initial positions, said edging die being eil'ective in said first named position to clamp the shell aganst said abutment.

- 7. In a machine for roll-edging and beading a cylindrical shell} the combination of a roll-edgin die, a bead forming die adapted to be inserted ing abutment and for simultaneously efiecting relative movement between said beading die and shell to position said beading die adjacent the shell, means operative in timed relation with said first named means to move the inserted beading die into engagement with the shell upon completion of the edging operation, and means for simultaneously effecting a disengaging movement between both of said dies and the shell.

8. In a machine for roll-edging and beading a cylindrical shell, the combination of a roll-edging die, an expansible bead forming die adapted to be inserted into the shell, a clamping abutment 7 arranged in opposed spaced relation to said rolledging die means for effecting relative movement between said edging die and shell axially of the shell to bring said edging die into operative engagement therewith to not only edge the shell but also to clamp the same in position against said clamping abutment and for simultaneously eil'ecting relative movement between said beading die and shell to insert said beading die within the shell, and means operative in timed relation with a into the shell while said first named dies are in engagement with the :shell and thereby holding it against movement, and a second power actuated means operable in timed relation to the first for moving said beading die into and out of engagement with the shell.

10. In a machine of the character described the combination of means for supporting a cylindrical metal shell, 9. head mounted for reciprocation toward and away from said support axially of a shell tliereon, a beading die on the forwa'rd end of said head insertable into the shell to form a bead therein intermediate its ends, and means including a horizontal guide member resting on the shell when positioned on said supporting means for engaging the bead formed therein to strip the shell from said beading die upon the withdrawal of said head and for guiding successive shells into position on said support. 11. In amachine of the character described, a transfer mechanism for presenting successive cylindrical metal blanks to a die mechanism or the like comprising an inclined runway for su porting a series of cylindrical blanks. for rolling movement toward said beading means with the blanks disposed in parallel relation, said nmway havingnotches therein for receiving nd holding the blanks in successive positions a step-bystep advance thereof, a reciprocatablerack extending along said runway beneath the surface there-- of, a plurality-of pushers tiltably mounted on said rack, actuator means for tilting said pushers alternately above and below the surface of said runway to bring the same alternately into and out of pushing position with respect to the-blanks, u

and means for reciprocating said rack in timed relation with the tilting of said pushers.

'12. In a machine of the character described,

a transfer mechanism for presenting successive cylindrical metal blanks to a die mechanism or the like comprising, means for supporting a series of cylindrical blanks disposed in parallel relation,

a reciprocatable rack extending beneath said last named means transversely to said blanks, a plurality of pushers tiltably mounted on said ra'ck, actuator means for tilting said pushers alternately upward into engagement with the blanks and downward out of engagement therewith to,

tion with the tilting of said-pushers.

13. In a machine of the character des'cribed,-a transfer mechanism for presenting successive cylindrical metal blanks to a die mechanism or the like comprising, meansfor supporting a se-e -ries of cylindrical blanks disposed in parallelrelation, a reciprocatable rack extending beneath said last named means transversely to the blanks, and a plurality of pushers movably mounted on said rack and adapted to project upwardly from said rack and operatively engage the blanks during the forward movement of the rack and to be;

tilted downwardly out of the path 0! said blanks during the backward movement oi said rack, at

least one of said pushers having a recess formed in the rear side thereof adapted to cradle a blank pressed against the same by the next adjacent pusher, to thereby position such blank with respect to the die mechanism or the like.

14-. In a machine or the character described, means for supporting a cylindrical metal shell, a die support, a roll edging die and a heading die carriedby said die support, a first power actuated means ior 'eii'ecting a relative advancing movement between'said supports axially of a blank carried by the support to engage the blank by said edging die with a period of dwell 'at the end of said advance movement, and a second power actuated means operable in timed relation with the first for moving said beading die into and out of engagement with the blank during said period of dwell and for thereafter eflecting relative movement between said supports to return the same to their initial positions. I 15. In a machine of the character described, 20 the combination of a fixed die for shaping the edge of a cylindrical metal shell, a reciprocable head for pushing a shell into engagement with the die, a stripper presenting an elongated edge extending transversely across the periphery of the shell intermediate the latters ends when the shell is in engagement with the die, and power actuated means for withdrawing said head from shell-en gaging poation and sequentially moving said stripper endwise of the shell away ir-om said 3 die into engagement with acurl on the opposite end 01. the shell to strip it from the are;

- p cam. cinemas

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