DE2407986A1 - METAL CONTAINER MOLDING METHOD AND EQUIPMENT - Google Patents

Description

Hamburg, February 13, 1974 156373 704.1A (CBl)

Priority: February 22, 1974 U.S.A. Pat. 334.692

Applicant:

United Can Company Hayward, CaI., USA

Method and device for molding metal containers

The invention relates to the manufacture of "three-part" Metal container, i.e. container, u> ie e.g. food cans, which turn a rectangular sheet metal into a cylinder has shaped central part, the edges of which are connected by a soldered overlap along the length of the cylinder are, to which two end pieces are then attached by Ulalzvorgangs.

More recently it has been found to be desirable to have a cylindrical neck of reduced diameter at one end of the cylindrical central portion of a container

409835/0335

to train. In subsequent work steps, a Container end part of correspondingly smaller diameter assembled with the tapered neck end of the container middle part and attached to this by a tlialz process, There is a flanged edge with a smaller diameter than the container diameter. The other end of the middle part of the container is bent outwards in a flange-like manner and fitted together with an end part of normal size. The edges of the end part and the flange part on the The middle part of the container then becomes one in a rolling process Shaped rim, the inner diameter of which is slightly larger than the diameter of the rim at the tapered neck end of the container. This configuration thus enables the use of a somewhat smaller end part at one end of the container and leads to a considerable saving in material in the case of mass production. This configuration also makes it possible to place the filled containers on top of one another to be stacked so that the neck-like tapered end of a container is inserted into the normal diameter container end. This nesting is special advantageous in warehouses with open shelves, in which the stacked containers sit more securely on top of one another. This also results in advantages in operations in which, for example, two cans are connected to form a single sales unit.

409835/0335

In typical machines for forming cylindrical container parts If a gripping device is provided, do 1 before the middle part of the container is grasped from the outside and this axially aligned with a pair of molds, axially aligned for the molding of the ends, the molds each on the container ends pressed on to the desired shape at the end of the container to create. After the molding process, the molds are pulled off the container ends, so that the container middle part released and moved to the next processing point. In machines in which the The same operation is carried out for the container, i.e. a flange or a tapered one at each end of the container Neck is formed, one encounters little difficulty in stripping the molds from the container ends, because the tensile force exerted by one retracted form on the container center part is exerted by the opposite one The tensile force of the form pulled off on the opposite side is compensated. Even if it was a minor disturbance the equilibrium of the forces acting on the container when the molds are drawn off occurs, the gripping device can hold the container against axial displacement.

On the other hand, there is a serious problem when it is desired to neck one end of the container center part while at the other end at the same time a flange is formed. With a typical shape

409835/0335

for the formation of end flanges there is a very small frictional resistance to / ischen the mold for the production of the flange and the container end provided with a flange therein, and it is therefore a very small one Force required to hold the container against axial deflection when it is stripped from this shape. if on the other hand, a container end in a mold for training a neck base and a cylindrical neck base formed on the container, there is a frictional engagement here of considerable size at the base of the neck of the container and the corresponding shape, and it is one considerable force is required to do this with a neck base to strip the end of the container from the mold. During this stripping process, tensile forces of an order of magnitude often occur from 25 lbf (etu / a 11.34 kp) to. lüenn at both ends a neck base is formed, the withdrawal force of a mold offset by the pull-off force of the other shape. UJenn however, one end is formed with a neck and the other with a flange, creating the peeling of the mold for the flange design has essentially no tensile force on the container in order to prevent it from bending with the mold to keep the neck formation when it is withdrawn. As a result, the entire force must be in the container to hold against axial displacement when pulling off the mold for the neck base by the gripping device

409835/0335

for the container are applied. As the gripping device exerting radially inward forces on the unsupported central part of the container leads the application a force on the neck taper sufficient to hold the container when the mold is stripped off Gripping device to the fact that the container gives way and bends or warps.

These disadvantages are avoided in the invention in that a cylindrical container center part between axially aligned Molds to form a tapered neck and flange is used, so that the molds are pressed together that the container ends for the molding process completely in or on the respective molds be pressed. The molds are then pulled apart, the container middle part according to the invention first at the Form for the flange formation is clamped to the end of the container middle part provided with a tapered neck extension subtract from the associated shape. The container is gripped and held between its ends, so that the form for forming the flange is then removed from the flanged end of the machined middle part of the container can be.

A main purpose of the invention was to learn a l / and to provide a device for forming containers, one end of a container center portion having a neck

-409835/0335 - s -

approach and the other end provided with a flange and the container should be held securely without 'at Abr strip the shaped container part from the mold for the formation of the neck there is a risk of deformation for the container, and furthermore a very high working speed and working capacity in the order of about 600 containers per minute and should be reached.

This uiird achieved according to the invention in that on one At the end of the middle part of the container an outwardly projecting flange is formed, while at the other end a tapered one Neck base is formed., And that then provided with a flange container end at the opposite of the flange Form is securely clamped. Because the container end is bent back all the way and through the guide part of the flange Forming form is supported, the clamping force at the container end be quite considerable without the risk of damage or deformation of the container. U / enn the container is held in this way, the shapes are moved apart, to strip the molded container part from the necking mold. This wiping process is possible thus, actually gripping or holding the container from the gripping device over to the mold for flanging. After the container middle part of the shape for the neck formation either completely or at least sufficiently that is only deducted

409835/0335

a small amount of force is required on the container to hold it in place during the final stripping process becomes the restraint of the container on the mold for flange formation lifted, the container is held by the gripping device and the shape for flanging from the one with a flange provided end stripped. When both forms have been stripped from the container, the container middle part thus released can be ejected or removed from the gripping device.

Further advantages and features of the invention emerge from the claims and from the following description and the drawing in which the invention is explained and illustrated, for example. Show: Fig. 1 is a longitudinal section of an according to the invention

Turret head machine for forming a flange and a tapered neck on a container, only one of the machine heads shown is,

FIG. 2 shows a longitudinal section of a mold provided in FIG. 1 for producing the neck taper for Illustration of the mutual assignment of the parts before the insertion of the container end in the form

FIG. 3 shows a representation of the shape corresponding to FIG. 2 for the formation of the neck taper in FIG their position with a fully introduced

th container end,

409835/0335

Fig. 4 is a cross section of a gripping device of Machine according to Fig. 1,

Fig. 5 is a longitudinal section of an in the machine according to Fig. 1 form used for the flange formation,

FIG. 6 is a partially sectioned view of the FIG shape shown along line 6-6,

7 is a diagram for illustrating the working time sequence of the mold for forming the neck, the gripping device for the container and the form for forming the flange in a machine according to FIGS. 1 and

8 is a generally schematic representation of the machine to illustrate the insertion and FIG the ejection of a container and the position of the head at various stages of the workflow in forming the neck and flange.

Fig. 1 shows a head of a multi-head equipped rotary head or turret machine 10, which opposite Has housing parts 11 and 12, which are each fixedly attached to a suitable bottle table, such as is not shown in detail. A hollow drive shaft 13 extends axially through the stationary housing and is at both ends in bearings 14, for example made of bronze bushings exist, rotatably mounted. On one end of the drive shaft, a drive gear 15 is keyed so that the shaft in the housings with the help of a usual, no

409835/0335

Drive shaft shown can be rotated.

A carrier part is located on the shaft 13 within the housing 11

16 attached, which spaced bracket or yokes

17 and 18, in which an IUeIIe 19 axially ver, which carries the shape for the formation of the tapered neck extension. is slidably guided. The axis of the UJelle 19 runs here parallel to the axis of the drive shaft 13. The shaft 19 for the shape to form the neck is rectangular or has a different, non-circular cross-section, and the Brackets 17 and 18 are designed accordingly so that the shaft cannot rotate about its axis in the brackets. At to the middle of the IKIa sch ine pointing En.de of the UJelle 19 is a holding device 20 is provided which carries a mold 21 for the formation of a neck base. At the other end of the UJelle 19, an eccentric roller 22 is attached, which runs in a guide track 23 which is in the outer surface of one of the Housing 11 attached control ring 24 is formed. The driver or control ring 24 extends completely around the UJelle 13 so that when the main drive rotates the UJelle 13 in the housing, the UJalze 22 along the Fixed guide track 23 is moved, the side walls of the guide track acting on the UJälze 22 to the to transfer the desired axial reciprocating movement to the UJelle 19 with the mold for the production of the neck attachment.

4098 3 5/03 3 5

A corresponding shaft 26 for a form for flange formation is arranged in the housing 12 and slidable in brackets 27 and 28 when an eccentric roller 29 is along a stationary guide track 30 is moved. The end of the shaft 26 that ends at the center of the machine a holding device 31 to which a mold 32 for forming the flange is attached. The shape 32 and the Form 21 are arranged coaxially. The holding device 31 is also attached to clips 33 for the container on. .

On the main drive shaft 13 there is a gripping device approximately in the middle 34 attached, u / elche is so arranged and designed that it engages the central part of a container 35 and keeps coaxially aligned with the two shapes.

Compressed air to operate the two forms, the clamps. the shape for the flange formation sotuie the gripping device for the container is fed to the machine as follows. Low pressure air passes through a peripheral connector 37 at the drive end of the machine and enters a line 38 in the hollow shaft 13. The line 38 extends up through an opening in the drive mile to a valve 39. A conduit 40 then leads from valve 39 in FIG the drive shaft 13 back, from which it is then led out again and to a passage 41 in the base 42 of the container

- 11 -

409835/0335

gripping device 34 is connected, u / elcher to one Piston-cylinder unit 43 in the base 42 leads. The valve 39 is a conventional two-way valve with one to be depressed Valve button 44, which can be actuated by a screw 45 is which for an axial movement on the Uielle 19 of the Form for the neck formation is mounted. When the valve button 44 is depressed, see Fig. 1, the valve connects lines 38 and 40 so that the container gripper 34 is supplied with low pressure air. If the U / elle 19 and thus the screw 45 ettuas bent to the left and thus releases the valve button 44, the valve 39 blocks the line 38 and the flow through this line and opens the Line 40 to the atmosphere, so that pressure venting of the gripping device 34 takes place.

High pressure air from a source 45 and is supplied via a rotating one Connection piece 46 at the free end of the machine into a line 47 in the drive shaft 13 and passes through a T-connector 48 and a line 49 to a valve 50. A flexible conduit 51 extends from valve 50 to the shaft and is connected to an internal passage 52 in that shaft, which leads to the form 21 for the manufacture of the base of the neck. The valve 50 is seated on one on the drive shaft 13 attached plate 53 and carries an eccentric roller 54, which is attached to a control surface 55 on a housing 11 Stauungsring 56 cooperates. The valve 50 and

40983 5/0335 -12-

24Q798 &

its actuators are of conventional design. Uienn the roller 54 is moved outwards by the control cam 55, valve 50 connects lines 49 and 51 so that high pressure air is supplied to the neck forming mold. li / hen the control surface 55 pushes the roller 54 inwards, the valve is operated so that the line 49 is blocked and the line 51 is vented to atmosphere.

Similarly, high pressure air is done from the T-connector 48 fed via a line 59 to a valve 60, from which a flexible conduit 61 leads to an internal passage in the shaft 26 of the mold for flange formation. By the operative engagement of an eccentric roller 63 and a control surface 64 the valve 60 is operated in such a way that either the lines 59 and 61 or the line are connected 59 is blocked and line 61 is open to the atmosphere.

Although the form 21 can be used to form a tapered neck of any known type at one end of the container, but has that shape in the case of the present invention machine preferably the one shown and described in detail in German patent application P 24 00 222.0 Construction.

- 13 -

4098 3 5/0335

Briefly summarized has that shown in Figs Mold 21 has an outer mold part 70 with an inwardly facing cylindrical mold surface 71 with an outer diameter of the container 35 approximately the same diameter, with an inwardly sloping molding surface 72 to form a Collar or a shoulder on the cylindrical container part and with a shaped surface 73 of reduced diameter for Formation of the cylindrical neck extension of smaller diameter at a 'container end. When one end of dBS container middle part is pressed into the mold, it comes with the inwardly sloping surface 72 of the outer mold part in contact and slides along this, bending it inward until the front edge of the container end meets a shoulder 74 of an inner guide part 75. With further introduction of the container into the mold the inner guide part 75 is then pushed axially into the forming device against the force of a spring 76, wherein the reduced diameter cylindrical neck portion at the holder end between the mold surface 73 and the outer surface 77 of the radially arranged guide segments 78 carried by the inner guide part is formed, see FIG. 3. Then the molded container part and the mold 21 are pulled apart the guide part 75 is pushed back into its original position by the spring 76, whereby the stripping of the container from the mold is supported at the beginning

409835/0335

The form 21 for the formation of the neck is with the help a screw 79 is securely fastened to the mold holder 20, and a pin 80 is provided, see FIG. 2, by one rotation the form 21 on the form holder. 20 to prevent. Compressed air flows from the passage 52 through an axial passage in the assembly screw 13 into the interior of a flexible sleeve or cuff 81. When this cuff is pressurized, it presses all of the guide segments 78 outwards in order to provide secure support while the neck is being formed the end of the container to be provided, with one or more of the guide segments being allowed to recede inwards, cue η η consisting of a thicker overlap point 82 The solder seam of the container is introduced into the molding device.

The gripping device 34 shown in FIGS. 1 and 4 has a radially extending web or carrier 85 which is fastened to the base 42 of the gripping device and on which two Gripper arms 86 and 87 are mounted. The gripper arm 86 is fixedly attached to the carrier 85, during the Gripper arm 87 is arranged on the carrier so as to be rotatable about an axis 88. A piston 89 which is in a bore 90 in the base 42 is displaceable, is biased outward by a spring 91 and engages the pivotably mounted gripper arm 87 to pivot this counterclockwise so that the arcuate surfaces 86a and 87a of the gripper arms clamp the middle part of a container 35

409835/0335 - 15 -

- - 15 -

A piston 92 in cylinder 4- can on the other hand of the journal 88 is brought into engagement with the pivotable gripper arm 87 and compressed air through the line and the passage 41 in the base of the gripper device is inserted into the cylinder 43, the piston 92 becomes outward printed, and / or by the gripper arm 87 against the bias the spring 91 is pivoted clockwise and thus the container 35 is released. In addition, with this movement of the Gripper arm 87 the edge 87b of the arcuate clamping surface 87a moved outwardly away from the axis of the drive shaft 13 to eject the container 35.

The mold 32 for forming a flange at one end of the container According to FIGS. 5 and 6, an inwardly sloping guide surface 101 is an outwardly facing guide surface 102, the diameter of which is substantially equal to or slightly smaller than the inner diameter of the container 35, and an outwardly curved surface 103 for flange formation. The mold 32 is housed in a molding shoe 104, which has a shoulder 105 at the end of the flange generating surface 103 and the relative movement of the container end limited to the shape forming the flange. The molding shoe 104 in turn rests against a core 106, and the The entire device for forming the flange is fastened to the form holder 31 with the aid of a screw 7. The core 106 is at 108 and 109 are provided with grooves which receive clamping arms 110, which each surround a bearing pin 111 on the core 106

409835/0335 - 16 -

mounted so that it can pivot and each end with a ' Clamping shoe 112 are provided. Each clamping shoe usually has an arcuate clamping surface 113, the curvature of which is the outer coron ! Tiantel area of the container part to be provided with a flange is equivalent to. The clamping shoes can be brought into engagement with the container in the vicinity of the flange formed thereon luerden and secure the container to the cylindrical Guide surface 102 of the form forming the flange fastened. Each of the clamping arms is biased outward with the aid of a spring 114, and the pivoting movement of the clamping arms that can be carried out around the pin 111 is sufficient for the clamping surfaces 113 to be able to be moved outwards behind the shoulder 105 of the mold shoe. The grain 106 also has radial bores 116 and 117, in each of which a piston 118 is arranged. The piston can be brought into engagement with a clamp arm on the opposite side of the journal 111 from the spring 114. The fastening screw 107 is provided with an axial passage 119 and lateral openings 120 so that the end surfaces the piston 118 is acted upon by compressed air via the inner passage 62 of the U / eile 26 and the screw 107 can be. UIf compressed air is applied to the pistons, move this the clamping arms against the bias of the spring 114 so that the clamping surfaces 113 with a Engage the container and clamp it onto the mold. When the pressure is released, the springs 114 can then Schiuenken clamping shoes 112 back from the mold 32. The clamping

409835/0335

surfaces 113 are preferably made of a plastic, such as Delrin, so that the container does not get scratched or damaged Scratches.

The mode of operation of the machine will now be explained in more detail in connection with FIGS.

A revolving conveyor 125 is usually one of the numbers the (ilaschinenkopfe the same number of receiving openings or Bags in which containers are held magnetically. The conveyor runs synchronously with the machine 10 and brings a container 35 in an associated gripping device 34, when this is in a position A, about 15 ° before reaching the vertical. At this point are the form for the formation of a neck and the form 32 for the formation of a flange by means of the eccentric rollers 22 and 29 brought to its fully retracted positions, see Figure 1. When the mold 21 is retracted, the valve is adjusted so that the gripping device 34 is supplied with compressed air so that the pivotable arm is in its open Position is moved. The valve 50 is operated under the action of the control surface 55 by the eccentric roller 56 that ' High pressure air is present in the guide part 75, by means of which the guide segments 78 are pressed outwards. The valve 60 is under the action of the control surface 64 by the Eccentric roller 63 actuated so that the core .der forming device for the formation of the flange is vented to.

409835/0335

- 18 -

to allow the springs 114 to exit the clamp shoes 112 hold off the shape 32. With further rotation of the main shaft and the feed device 125 presses a stationary ' The stripper arm 127 removes the container from the pocket 126, and the container is biased by a spring Retaining bracket 12Θ held in the gripping device.

UJe η η the container has reached position B - the Control guides 23 and 30 to move the two forms towards each other at the same time. In the position C, see Fig. 7, has The UJeHe of Form 21 is wide enough for the neck formation moved to vent the cylinder 43 of the gripper device by releasing the valve 39, and thus again to allow that the spring 91, the gripper arm 87 with the container in Brings clamping engagement so that the container is axially with the Forms 21 and 32 is held in alignment.

In the D position, the two shapes are mutually exclusive widely approximated that one end of the container enters mold 21 and the other end of the container enters mold 32 begins. In the position E there is one end of the container at the beginning of the inwardly sloping molding surface 72 of the molding device 21 for the formation of the neck, while moving the other end of the container is just at the beginning of the outwardly sloping front surface 103 of the mold 32.

During the movement from position E to position F

the ends of the container are re-flanged at the same time

409835/0335

- 19 -

with a flange on the outside and shouldering on the inside provided with a neck, the forces exerted by the opposing shapes on the container are in balance. In position F, the outwardly flanged end is shoulder straight of the molding shoe 104 and the inwardly inclined end just come into contact with the shoulder 74 of the guide member 75. At this point the control management interrupts 3G dio Forward movement of the mold 32 and almost hold it against axial movement. The control surface also effects the stowage F 64 an actuation of the valve 60 in order to activate the piston Supply compressed air so that dia Klammarma or Klammarn Securely clamp the forming device for the flange formation in the container.

During the construction from the stable F to the stable G the mold 21 continues its inward movement to the smaller diameter cylindrical neck base Shape container. During this time, all of the ajsciala pressure exerted on the container by the mold 21 acts fully against the stationary mold 32, and there is no pressure or thrust on the gripping device 34 of the container exercised.

During the movement from point G to point H, the form remains in the same axial position and starts at the bar H

- 20 409835/0335

withdrawn under the effect of their control management 23 and at the same time from the end of the container provided with a neck withdrawn to u / earth. Although the guide part 75 of the neck former is pretensioned to its original position by the spring 76 and the air pressure in the guide part, a considerable pulling force is exerted on the container 35 when the mold 21 is withdrawn. This pulling force will however, by the stationary mold 32, to which the opposite end of the container is securely clamped, counteracted in full. As a result, there is no result during this stripping process from the mold 21 Axial force between the container and the gripping device 34.

In position I, the inner guide part of the mold for the formation of the neck is back in its place outer initial position, and the control surface 55 causes an actuation of the V / Entils 50 such that the guide part is vented to allow the guide segments to recede radially inward. The mold 21 becomes continuous withdrawn further with the flange end of the container still clamped to the mold 32 until position 3 is reached in which there is engagement of the neck end of the container with the outer mold portion 70 of the neck former is completely canceled. At this point, the air pressure acting on the pistons 118 of the flange mold assembly becomes

- 21 - 409 8 3 5/0335

reserved to allow the springs 114 to move the clamp arms move to their outer position. At this point, the retraction of the flange former also begins.

The pulling force caused by the final stripping of the neck end exerted on the container by the inner guide body of the mold 21 with the guide segments that have receded radially is counteracted by the tensile force exerted on the container when the flange shape is stripped off. These tensile forces however, both are quite small, and even if these tensile forces are not quite in balance, it only has to a small force with the gripping device on the container be exercised. In the positions K and 'L, both shapes are stripped from the container and the shapes become continuous withdrawn further until they have reached their starting positions at point N

Shortly before that, the UJeHe of the neck-shaping device is placed at the point IYl worn screw 45 brought into engagement with the valve button to the gripper device compressed air to feed. The force of air pressure on piston 92 pushes pivotable arm 87 into its open position, wherein the container, which is provided with a neck and a flange, faces downwards in θϊπβ discharge path or chute 129 is expelled.

- 22 409835/0335

At a subsequent point P, the valve 5G.u / is down operated to pressurize the interior of the inner guide body of the neck molding. The machine elements uiBrden then brought the bodice to position A to the next Pick up container for the next work cycle.

-. EXPECTATIONS -

409835/0335

Claims (7)

EXPECTATIONS 1.) Method of shaping a ring shoulder and a tapered, cylindrical neck at one end and an outwardly protruding flange at the other end of one Container, characterized in that a flange forming device is initially partially inserted into the one container end is introduced while the other end of the container is partially is introduced into a neck-forming device that the forming devices are moved relative to one another, in order to completely guide the container ends and the molding devices into one another, that the container is in the vicinity of the integrally formed Flange is clamped to the associated forming device that the forming devices are relatively apart be moved, while the container at least when initially stripping the neck end from the pulling " obeyed molding device is held clamped, that the clamping of the flange end of the container is then released and the container is gripped in the area between its ends on the outer jacket surface and the so clamped container and the flange forming device at the same time relatively moved apart in the axial direction will. - 24 - 409835/0335 2. Uerfahren according to claim 1, characterized in that the container during the initial merging the molding devices and the container ends against a axial displacement is recorded that the two forming devices for simultaneous formation of the flange and the shoulder at the respective container ends are moved towards one another to form the base of the neck the movement of the neck former towards the flange device continues while it is after the shaping of the flange is held against axial movement until the container end clamped thereon with the molded flange is released, and that the container is then held against axial movement while the flange former is moved axially away from it 3. Device for performing a method according to claim 1 or 2, characterized in that a shaping device (21) for the formation of the tapered neck and a forming device (32) for the formation of the flange-like extension with a spacing for the introduction of a Container and coaxially to each other on a holding device (20,31) sit in that the holding devices are arranged to be movable relative to one another and away from one another are that a gripping device - (34) for clamping the lYlantelflache in the area between the ends of the coaxial - 25 - '409835/0335 the container (35) aligned with the forma devices is provided that guide means (22,23; 29,30) for
the control of the movement of the holding devices are provided that with the holding device (31) carrying the flange forming device (32) jointly movable clamping means (110,111,112) are assigned, which one
the flange-forming device movably assigned clamping surface (113) for clamping the one end of the container on this molding device and actuating means (114,116,118) for moving the clamping surface in the direction of the assigned molding device and from this meg. 4. Device according to claim 3, characterized in that the flange-forming device is one in a container end
insertable cylindrical guide part (102) and a
at the end of this guide part has an outwardly curved shape surface for the flange-like expansion of the inserted container end, and that the clamping surface (113) of the clamping means is assigned to the cylindrical guide part (102) of the flange forming device (32). 5. Device according to claim 3 or 4, characterized in that the clamping means with respect to the axis of two Flange forming device (32) diametrically opposite, have curved clamping surfaces (113), and that the - 26 409835/0335 The curvature of the clamping surfaces represents the curvature of the cylindrical Guide part (102) of the flange forming device. (32) corresponds. 6. Device according to one of claims 3 to 5, characterized in that the clamping surfaces (113) made of plastic exist. 7. Device according to claim 3, characterized in that the actuating means for moving the clamping surface (113) from the guide part (102) of the flange forming device meg a spring (114) and for moving the .Spannfläche on the guide surface of the forming device to a piston ( 118) which, under the pressure of a fluid, comes into engagement with the clamping means consisting of a clamping arm (110) in such a way that the clamping arm executes a movement directed against the bias of the spring (114). 409835/0335