EP0746430A1 - Tourelle pivotante a outils d'expansion - Google Patents

Tourelle pivotante a outils d'expansion

Info

Publication number
EP0746430A1
EP0746430A1 EP95903448A EP95903448A EP0746430A1 EP 0746430 A1 EP0746430 A1 EP 0746430A1 EP 95903448 A EP95903448 A EP 95903448A EP 95903448 A EP95903448 A EP 95903448A EP 0746430 A1 EP0746430 A1 EP 0746430A1
Authority
EP
European Patent Office
Prior art keywords
segments
turret
cone
pull rod
turret according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95903448A
Other languages
German (de)
English (en)
Inventor
Paul Wirz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OBERBURG ENGINEERING AG
Original Assignee
OBERBURG ENGINEERING AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OBERBURG ENGINEERING AG filed Critical OBERBURG ENGINEERING AG
Publication of EP0746430A1 publication Critical patent/EP0746430A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged

Definitions

  • the invention relates to a turret with expanding tools, a can expanding machine with such a turret and an expanding tool for such a turret.
  • metal cans are made from sheet steel (e.g. tinplate or tin-free steel sheet) or aluminum.
  • Steel cans can be used for food preservation or as beverage cans. They consist of three closely connected parts, namely a jacket, a base and a lid.
  • Aluminum cans on the other hand, are in two parts and are generally used as beverage cans.
  • Sheet steel cans can also be in two parts.
  • a central rod is provided for actuating the expanding tool, which presses the segments of the expanding tool apart.
  • the rod is pushed up by means of a guide roller and rail.
  • a spring keeps the guide roller in contact with the guide rail.
  • the object of the invention is to provide a turret of the type mentioned at the outset which permits a high production rate.
  • such a turret is characterized in that the expanding tools are positively guided by curved tracks. That is, Movement and countermovement (e.g. upward and downward movement) are controlled by separate cam tracks.
  • the working position of the individual expanding tool is thus completely defined by the rotational position of the tower. Synchronization problems that arise when using hydraulic or other independent tool drives are avoided overall.
  • a plurality of segments that can be moved radially to a vertical axis are provided for each expanding tool.
  • the segments are pressed outwards by at least one cone which can be displaced in the vertical direction on the axis mentioned (in order to thereby expand the can jacket).
  • Two cones are preferably connected via a tie rod to guide rollers guided in curved tracks.
  • the tapering of the cones and the course of the cam track are designed such that when the segments expand, the pull rod is subjected to a tensile load. Shows the expanding plant stuff upwards (so that the can part to be expanded can be pushed onto the expanding tool from above), then the cones taper from top to bottom and are pulled downwards in accordance with the course of the curved path in order to press the segments apart.
  • the guide rollers rolling on the cam tracks are arranged in a vertically guided slide.
  • the slide is connected to the pull rod via a coupling that is tolerant to longitudinal axis displacement and is shear-resistant.
  • the coupling therefore has a degree of freedom transverse to the direction of pull or pushing force in order to be able to accommodate individual manufacturing or assembly tolerances. If there is a rigid connection between the tie rod and the guide slide, then it must be manufactured with a very high level of accuracy so that undesired constraining forces or bending moments do not occur.
  • a longitudinal axis offset tolerant coupling can e.g. B. have a recess perpendicular to the vertical axis, in which a coupling head of the tie rod can be freely positioned transversely to the vertical axis.
  • Plastic slides are preferably used to form the sliding contact. These are intended as (replaceable) insert parts in the segments. Instead of plastic, sintered bronze, bronze with graphite inclusions, plastic-coated steel sheet or the like can also be used.
  • the sliding elements are preferably, but not necessarily, attached to the segments as replaceable wear elements. It is also conceivable to coat the cone or to provide it with interchangeable sliding elements.
  • the sliding elements are preferably fitted into recesses in the segments.
  • the cone and tie rod are e.g. B. made of steel, so that the sliding contact between the plastic sliders and the Stahlober ⁇ surface. It is advantageous in this case to match the sliding surfaces of the plastic glides and the cone to one another in terms of shape in order to obtain the widest possible contact surface. In this sense, the cone z. B. for each segment on a flat sliding surface.
  • an oil-soaked felt ring can be arranged on a wide end of the cone. This sweeps over the plastic glides in each expansion cycle.
  • An oil reservoir can be set up in the pull rod which constantly supplies the felt ring with lubricating oil via lines.
  • Tie rod and cones are e.g. B. formed in one piece from hardened steel.
  • the segments run with their foot end in a radial guide tunnel or channel of a coaxial arranged to the tie rod ring element.
  • a dovetail guide or something similar can also be provided. It may also be advisable to guide the segments at the top. But then it is only a question of stabilizing the segments relative to each other (the insertion of the can parts onto the expanding tool must of course not be hindered).
  • the expanding tools are preferably below the can transfer level. However, it is not excluded that the expanding tools are turned upside down so that the can parts can simply be pushed onto the tool heads from below.
  • a continuous conveyor belt system is provided in a system of the type mentioned, on which the processing stations are arranged, the can parts being temporarily removed from the conveyor belt system for processing and returned to the latter.
  • the conveyor belt is not interrupted by the individual processing stations.
  • the conveyor system no longer has to be changed if e.g. B. the Dosenexpandierauto is replaced at.
  • the continuously rotating ones allow a much higher processing speed.
  • the expansion can be distributed over a larger range of rotation angles than with stepwise working machines without having to limit the output quantity.
  • a turret unloading device is advantageously provided which returns the expanded can parts to the system conveyor belt in such a way that the can parts leave the expanding system in the same direction as they were conveyed.
  • the transport system is therefore preferably an uninterrupted straight conveyor belt system. From a conceptual point of view, the individual can parts are not moved from one optimally working processing station to the next, but the individual processing stations are placed on a continuous, as straight as possible conveyor belt. In other words, the individual processing stations are structurally aligned to the overall system and not vice versa.
  • the rotary tower can be preceded by a positioning device in order to be able to put the can parts into the rotary tower with a predetermined orientation.
  • the positioning device is e.g. B. even a turret with a variety of Posi ⁇ tioning heads that z. B. perform an alignment of the weld to a certain angular position.
  • FIG. 1a shows a schematic diagram of a plant according to the invention
  • FIG. 1b shows a schematic representation of a machining station for expanding the can parts
  • 1c shows a schematic representation of a machining station with two rotating towers
  • Fig. 2a-c axis cross sections along the lines A-A, B-B, respectively.
  • C-C according to Fig. 2;
  • 3a, b show the mechanical guidance of the expanding tool in longitudinal and cross-section.
  • FIG. 1 a illustrates a preferred concept for realizing a plant for the production of cans.
  • a substantially straight system conveyor belt 1 provides as it were the backbone of the overall system.
  • three processing stations 1.2, 1.3, 1.4 are provided. These do not have their own conveyor belt section and therefore do not have to be inserted into the system conveyor belt. Rather, they stand next to the system conveyor belt 1 (or at the beginning or end thereof) and remove or transfer the can parts to be processed from or onto the system conveyor belt 1.
  • the system conveyor belt 1 can e.g. B. via a buffer zone 1.1 (queue) between the first and the second processing station 1.2 respectively. 1.3 have.
  • the first processing station 1.2 provides z. B. the expandable jacket part.
  • it forms the casing with the base from a punched-out aluminum or sheet steel blank (for example by extrusion).
  • the teasing and flanging can also take place before the second processing station 1.3, ie the tapering of the jacket end and the bending of the jacket edge to form a radially outward-facing flange.
  • the expanded part is ready for filling and requires no further processing. It can be packed for shipping.
  • the base In the case of three-part tinplate cans, the base must be inserted after the expansion. The teasing and / or flanging can also be carried out after the expansion.
  • FIG. 1b shows a section of the system conveyor belt 1, on which the can parts are transported from one processing station to another.
  • the processing station for expanding the can parts is shown. It is an automatic expansion machine 2 with a functionally central turret 4.1. This is equipped with a large number of expanding tools and rotates continuously.
  • a separation device 3 known per se transfers the supplied can parts 6.1 to a rotary star 5.1. This transports the can parts 6.1 to the rotating tower 4.1 standing next to the system conveyor belt 1.
  • the actual processing takes place on the turret 4.1. It takes z. B. a rotation angle of 270 ° in claim.
  • a second rotary star 5.2 takes over the processed can parts 6.2 from the rotary tower 4.1 and returns them to the system conveyor belt.
  • the automatic expansion machine 2 is constructed without a conveyor belt in order to be able to be placed on any system conveyor belt (after adjusting the working height of the separating device, etc.). It is important that the can parts 6.1, 6.2 are accepted by the automatic expansion machine 2 at the same level as they are delivered. The same applies to the "pick-up" and “delivery” directions. That is, The rotating stars 5.1 and 5.2 are also there to be able to receive the can parts 6.1, 6.2 on the same line as they are being delivered.
  • FIG. 1c shows an automatic expansion machine which, in addition to the turret 4.1, has a turret 4.2 for positioning or aligning the jacket part (for example for adjusting the longitudinal seam or the subject to the subsequent expansion).
  • a turret 4.2 for positioning or aligning the jacket part (for example for adjusting the longitudinal seam or the subject to the subsequent expansion).
  • Such alignment of course only makes sense if the can parts are not expanded in a rotationally symmetrical manner (but rather, for example, square).
  • the rotary star 5.1 first transfers the can to the rotary tower 4.2, which has a large number of rotatable positioning heads.
  • the head with the can part is z. B. rotated until an optical sensor emits a signal (eg due to the jacket-side weld seam).
  • a rotating star 5.3 transfers the positioned can parts to the rotating tower 4.1 in a defined manner. When handing over, it must be ensured that the can parts are always held in some way so that the orientation cannot be lost.
  • FIG. 2 and 2a-c show an expanding tool in the axial longitudinal section.
  • it has eight segments 7.1,..., 7.4 arranged about a common axis (only four of the eight segments are provided with reference numerals in the figure).
  • the segments 7.1, ..., 7.4 with their backs or outer surfaces 8.1, ..., 8.4 form a lateral surface, respectively.
  • a can blank 9 pushed over the segments 7.1, ..., 7.4 e.g. the casing of a three-part tin can or the container-like part of a two-part aluminum can
  • a vertical pull rod 10 In the center of the expanding tool is a vertical pull rod 10 with two axially spaced cones 11, 12.
  • the segments 7.1, ..., 7.4 are matched on the inside to the pull rod 10 such that they are pushed radially outwards when the pull rod 10 is pulled down vertically.
  • the interaction between the tie rod 10 or the cones 11, 12 and the segments should be exemplified on the segment 7.1 are explained.
  • the segment 7.1 has an inclined surface with a plastic slider 13.1, 13.2 for each cone 11, 12.
  • the surface geometry of the surfaces of the cone 11 and the plastic slider 13.1 are matched to one another in order to enable the largest possible surface contact with a relatively low surface pressure.
  • the cones for contact with the segments 7.1,..., 7.4 preferably have flat, flattened areas. They taper from the upper, broad end of the cones 11, 12 to the lower, tapered end.
  • the plastic glides 13.1, 13.2 are designed with elongated, flat trapezoidal surfaces.
  • a Filz ⁇ ring 14 At the upper, broad end of the cone 11 and 12 is a Filz ⁇ ring 14 respectively. 15 is provided, which is soaked with lubricating oil and with each stroke of the pull rod 10, the plastic slider 13.1 or. 13.2 lubricates.
  • the pull rod 10 has z. B. at the upper end via an oil reservoir 19 which continuously supplies the felt rings 14, 15 with oil via bores 16, 17, 18.
  • Each segment z. B. 7.1, 7.4 has a guide foot 20.1 resp. 20.4. This is e.g. B. cuboid and runs in a correspondingly trained guide channel 21.1 respectively.
  • April 21 The (eight) guide channels z. B. 21.1, 21.4 extend radially in a guide ring which is formed by a plate 23 with a cover 22.
  • the cover 22 closes the recesses mentioned above and outside. Cover 22 and plate 23 are screwed together.
  • a spring pin 25 is provided, which the segment 7.4 presses radially inwards.
  • the spring bolt 25 is supported on an inner side 26 of the cover 22. The spring bolt 25 thus ensures that the segment 7.4 is always in contact with the outer surface of the cones 11, 12.
  • the plate 23 is flange-shaped on the end of a tube 27.
  • the latter serves to guide the pull rod 10.
  • the tube 27 has a recess 31 on the jacket side for attaching an anti-rotation device.
  • the anti-rotation device is formed by a flat section 28 formed on the pull rod 10 and a small bar 29 resting on the flat section 28 (cf. FIG. 2c).
  • the beam 29 is fixed with screws 30.1, 30.2 in the recess 31 in the tube 27.
  • the flat grinding 28 slides on the beam 29 and prevents the pull rod 10 from rotating about its longitudinal axis.
  • a plate 32 with elongated holes can be provided, in which guide bolts 33.1 and. 33.4 can drive back and forth. In this way, a lateral tilting of the segments (transverse to the radial direction of displacement) can be prevented.
  • the pull rod 10 is coupled to a carriage 42, which is shown in detail in FIG. 3a.
  • the pull rod 10 has at the lower end via a threaded bore 34 into which a bolt 35 of a coupling head 36 is screwed, with the interposition of a slip ring 37.
  • the coupling head 36 is respectively in a recess 40 between a first and a second part 38. 39 guided a coupling piece.
  • the upper part 38 of the coupling piece has a recess 41 for the pull rod 10.
  • the recess 41 is less wide than the recess 40, so that the coupling head 36 can be displaced perpendicular to the axis of the pull rod 10, however Forces in the direction of the axis of the tie rod 10 can be transmitted completely. The tensile force is thus transmitted by positive locking (the coupling head 36 engages behind the recess 41). The coupling head 36 can be pushed into the coupling piece from the outside (in relation to the axis of rotation of the turret).
  • the part 39 is fastened with two screws 43.1, 43.2 to the upper, angled part of the carriage 42.
  • Two cam rollers 44, 45 are provided one above the other on the vertical (not angled) part of the slide.
  • the lower cam roller 45 is larger than the upper one, since it has to withstand the (high) forces when performing the expansion. It rolls on a downward rolling surface 47 of a guide rail 50.
  • the rolling point 49 is preferably on the extension of the central axis 48 of the pull rod 10. In this way, the very high tensile forces (eg 30 kN) can be optimally introduced into the pull rod 10.
  • the upper cam roller 44 rolls on an upward rolling surface 46 of the guide rail 45. It ensures that the pull rod 10 is pushed up again after the expansion and the segments 7.1, ..., 7.4 can retract again.
  • the load on the upper cam roller 44 is therefore relatively small.
  • the rail 50 which is fixedly anchored to the base of the automatic expansion machine, together with the two cam rollers 44, 45 causes the pull rod 10 to be positively guided.
  • the vertical position of the tie rod 10 is thus clearly defined by the rotational position of the turret.
  • the beginning and end of each work cycle are due to the mechanical construction and not by electrical or hydraulic drives respectively. Controls defined. This is very important when driving at high work speeds.
  • FIG. 3b shows a sectional illustration along the line A-A according to FIG. 3a.
  • the carriage 42 is mounted between two prismatic longitudinal guides 52.1, 52.2 so as to be displaceable in the vertical direction.
  • the longitudinal guides 52.1, 52.2 lying diametrically opposite one another are mounted on a slide carrier 51 of the turret.
  • the mode of operation of the automatic expansion machine is now briefly explained below.
  • the prepared can parts are conveyed on the system conveyor belt 1 (see FIG. 1). If they already have a base (as is usually the case with two-part aluminum cans), it is advantageous if they are already upside down. They are separated by the separating device 3 and placed in the rotary star 5.1 at the correct speed. Then the can parts from the turret 4.1 z. B. gripped with the help of magnetic or vacuum grippers and pushed one after the other over the expanding tools. The latter are located on a lower floor than the transfer level of the rotary star 5.1. The pull rod 10 is in the uppermost position when the can blank 9 is slipped on (see FIG. 2, left side).
  • the expansion process is now initiated in that the carriage 42 rolls off the cam roller 45 on the guide. tion rail 50 is moved down. The segments move to the outermost position (as shown in FIG. 2 on the right side).
  • the can blank 9 takes on the shape of the outer surfaces 8.1, ..., 8.4.
  • the can parts 6.1 (cf. FIG. 1b) are first transferred from the rotary star 5.1 to a turret which contains the weld seam in be ⁇ positioned correctly.
  • the can parts can then be transferred from this revolving tower to the revolving tower 4.1 for expansion via a further interposed rotary star.
  • the position of the weld seam must of course not be able to change in an uncontrolled manner during the transfer.
  • gripping devices can be provided which ensure a precisely defined transfer.
  • the invention has created a production plant which enables a considerable increase in speed, promotes modular plant construction and is easy to maintain.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Specific Conveyance Elements (AREA)

Abstract

L'invention concerne un dispositif automatique d'expansion pour le formage d'ébauches pour boîtes de conserve, équipé d'une tourelle pivotante entraînée en rotation continue et présentant une pluralité d'outils d'expansion. Ces outils fonctionnent au moyen de biellettes (10) à guidage forcé. Chacune de ces biellettes (10) présente au moins un cône (11, 12) sollicitant les segments (7.1, ..., 7.4) par pression de manière à les séparer. Les segments présentent des éléments coulissants interchangeables (13.1, 13.2) qui optimisent le contact coulissant prévu entre le cône (11, 12) et les segments (7.1, ..., 7.4).
EP95903448A 1995-01-04 1995-01-04 Tourelle pivotante a outils d'expansion Withdrawn EP0746430A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB1995/000010 WO1996020798A1 (fr) 1995-01-04 1995-01-04 Tourelle pivotante a outils d'expansion

Publications (1)

Publication Number Publication Date
EP0746430A1 true EP0746430A1 (fr) 1996-12-11

Family

ID=11004315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95903448A Withdrawn EP0746430A1 (fr) 1995-01-04 1995-01-04 Tourelle pivotante a outils d'expansion

Country Status (3)

Country Link
EP (1) EP0746430A1 (fr)
AU (1) AU1249795A (fr)
WO (1) WO1996020798A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5704244A (en) * 1995-06-07 1998-01-06 American National Can Company Apparatus for reshaping a container
US5727414A (en) * 1995-06-07 1998-03-17 American National Can Company Method for reshaping a container
IL137649A (en) * 1998-02-18 2004-08-31 Genentech Inc Method of adsorption chromatography
DE102008064320A1 (de) 2008-12-20 2010-06-24 Cantec Gmbh & Co. Kg Vorrichtung zum Aufweiten von Rohrstücken
DE102011100506A1 (de) 2011-05-04 2012-11-08 Cantec Gmbh & Co. Kg Verfahren und Vorrichtung zum Aufweiten von Zylinderrohrstücken
DE102013106287A1 (de) * 2013-06-17 2014-12-18 Thyssenkrupp Steel Europe Ag Vorrichtung zur Herstellung mindestens eines Hinterschnitts in ein geschlitztes oder geschlossenes Blechprofil
EP3698941A3 (fr) 2019-02-20 2020-10-21 Milwaukee Electric Tool Corporation Outil d'expansion pex
EP3698942A3 (fr) 2019-02-20 2020-10-28 Milwaukee Electric Tool Corporation Outil d'expansion pex
CN214726466U (zh) 2020-11-27 2021-11-16 米沃奇电动工具公司 扩展工具
US11779990B2 (en) 2021-04-09 2023-10-10 Milwaukee Electric Tool Corporation Expansion tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698337A (en) * 1969-12-11 1972-10-17 Dale E Summer Can bodies and method and apparatus for manufacture thereof
FR2125149B1 (fr) * 1971-02-15 1974-03-01 Gallay Futs Metalliques
DE3804607A1 (de) * 1988-02-15 1989-08-24 Siemens Ag In eine rohrleitung einfahrbare rohrformvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9620798A1 *

Also Published As

Publication number Publication date
AU1249795A (en) 1996-07-24
WO1996020798A1 (fr) 1996-07-11

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