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EP2353746A1 - Fabrication de boîtes - Google Patents

Fabrication de boîtes Download PDF

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Publication number
EP2353746A1
EP2353746A1 EP10152593A EP10152593A EP2353746A1 EP 2353746 A1 EP2353746 A1 EP 2353746A1 EP 10152593 A EP10152593 A EP 10152593A EP 10152593 A EP10152593 A EP 10152593A EP 2353746 A1 EP2353746 A1 EP 2353746A1
Authority
EP
European Patent Office
Prior art keywords
cup
base
stretch
punch
sidewall
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Withdrawn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
EP10152593A
Other languages
German (de)
English (en)
Inventor
Jonathan Riley
Alain Presset
Keith Alan Vincent
Stuart Alexander Monro
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.)
Crown Packaging Technology Inc
Original Assignee
Crown Packaging Technology Inc
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 Crown Packaging Technology Inc filed Critical Crown Packaging Technology Inc
Priority to EP10152593A priority Critical patent/EP2353746A1/fr
Priority to US12/759,298 priority patent/US8313003B2/en
Priority to EP11702226.9A priority patent/EP2531310B1/fr
Priority to AU2011212418A priority patent/AU2011212418B2/en
Priority to MX2012009020A priority patent/MX2012009020A/es
Priority to RU2012137494/12A priority patent/RU2566941C2/ru
Priority to IN6690DEN2012 priority patent/IN2012DN06690A/en
Priority to JP2012551643A priority patent/JP2013518724A/ja
Priority to JP2012551636A priority patent/JP2013518723A/ja
Priority to PCT/EP2011/051666 priority patent/WO2011095595A1/fr
Priority to PCT/EP2011/051695 priority patent/WO2011095613A1/fr
Priority to US13/577,172 priority patent/US9545655B2/en
Priority to CA2787546A priority patent/CA2787546C/fr
Priority to NZ601599A priority patent/NZ601599A/en
Priority to CN201180016908.6A priority patent/CN102858643B/zh
Priority to DK11702635.1T priority patent/DK2531409T3/en
Priority to MX2012009023A priority patent/MX337296B/es
Priority to PH1/2012/501527A priority patent/PH12012501527A1/en
Priority to RU2012137507/02A priority patent/RU2557845C2/ru
Priority to AU2011212400A priority patent/AU2011212400B2/en
Priority to EP11702635.1A priority patent/EP2531409B1/fr
Priority to BR112012019014A priority patent/BR112012019014A2/pt
Priority to MYPI2012003371A priority patent/MY164686A/en
Priority to CA2789110A priority patent/CA2789110C/fr
Priority to CN201180008424.7A priority patent/CN102725079B/zh
Priority to NZ601598A priority patent/NZ601598A/en
Priority to ES11702226T priority patent/ES2741590T3/es
Priority to ES11702635.1T priority patent/ES2583266T3/es
Priority to HUE11702635A priority patent/HUE030556T2/en
Priority to PL11702635T priority patent/PL2531409T3/pl
Priority to BR112012019170A priority patent/BR112012019170A2/pt
Priority to UAA201210431A priority patent/UA110474C2/ru
Publication of EP2353746A1 publication Critical patent/EP2353746A1/fr
Priority to ZA2012/05621A priority patent/ZA201205621B/en
Priority to CO12128378A priority patent/CO6612237A2/es
Priority to CO12128382A priority patent/CO6551761A2/es
Priority to US13/653,735 priority patent/US9334078B2/en
Withdrawn legal-status Critical Current

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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank

Definitions

  • This invention relates to the production of metal cups and in particular (but without limitation) to metal cups suitable for the production of "two-piece" metal containers.
  • US 4095544 (NATIONAL STEEL CORPORATION) 20/06/1978 details conventional DWI and DRD processes for manufacturing cup-sections for use in making two-piece metal containers. [Note that in the United States of America, DWI is instead commonly referred to as D&I].
  • DWI is instead commonly referred to as D&I].
  • the term "two-piece” refers to i) the cup-section and ii) the closure that would be subsequently fastened to the open end of the cup-section to form the container.
  • a flat (typically) circular blank stamped out from a roll of metal sheet is drawn though a drawing die, under the action of a punch, to form a shallow first stage cup.
  • This initial drawing stage does not result in any intentional thinning of the blank.
  • the cup is pushed through one or more annular wall-ironing dies under the action of the punch for the purpose of effecting a reduction in thickness of the sidewall of the cup, thereby resulting in an elongation in the sidewall of the cup.
  • the ironing process will not result in any change in the nominal diameter of the first stage cup.
  • Figure 1 shows the distribution of metal in a container body resulting from a conventional DWI (D&I) process.
  • Figure 1 is illustrative only, and is not intended to be precisely to scale. Three regions are indicated in figure 1 :
  • the same drawing technique is used to form the first stage cup.
  • the first stage cup is then subjected to one or more re-drawing operations which act to progressively reduce the diameter of the cup and thereby elongate the sidewall of the cup.
  • the re-drawing operations are not intended to result in any change in thickness of the cup material.
  • the container body is typically made by drawing a blank into a first stage cup and subjecting the cup to a number of re-drawing operations until arriving at a container body of the desired nominal diameter, then followed by ironing the sidewall to provide the desired sidewall thickness and height.
  • the metal packaging industry is fiercely competitive, with weight reduction being a primary objective because it reduces transportation and raw material costs.
  • weight reduction being a primary objective because it reduces transportation and raw material costs.
  • around 65% of the costs of manufacturing a typical two-piece metal food container derive from raw material costs.
  • cup-section and “cup” are used interchangeably.
  • a method for manufacture of a metal cup comprising the following operations:
  • the "drawing operation” referred to above is occasionally referred to as the "post-stretch drawing operation” to signify it taking place after the stretching operation.
  • the method of the invention has the advantage over known processes of thinning the base of the resulting cup relative to the ingoing gauge of the metal sheet prior to the stretching operation, without requiring loss or waste of metal.
  • the invention When applied to the manufacture of two-piece containers, the invention enables cost savings to be made of the order of several dollars per 1,000 containers relative to existing manufacturing techniques.
  • the stretching operation is essential to achieve thinning of the base of the cup.
  • the increased surface area in the base resulting from the stretching operation provides "excess material”.
  • This "excess material” is pulled and transferred from the base into the sidewall during the subsequent drawing operation.
  • the subsequent transfer of material from base to sidewall during the post-stretch drawing operation is better illustrated in the embodiments of the invention shown in the attached drawings (see especially figure 10c ).
  • the method of the invention is particularly suitable for use in the manufacture of metal containers, with the final resulting cup being used as the container body.
  • the drawing operation performed on the stretched cup may comprise two or more drawing stages to effect a staged reduction in cup diameter and increase in sidewall height. Further, the cup may also be subjected to an ironing operation to both thin and increase the height of the sidewall, and thereby maximise the enclosed volume of the final resulting cup.
  • the final resulting cup may be formed into a closed container by the fastening of a closure to the open end of the cup. For example, a metal can end may be seamed to the open end of the final resulting cup (see figure 13 ).
  • the method of the invention is suitable for use on cups that are both round and non-round in plan. However, it works best on round cups.
  • the sidewall thickness is critical in affecting the performance characteristics of a cup used for a container (can) body.
  • the invention has the advantage of transferring material into the performance critical part of the cup (i.e. the sidewall), whilst also minimising the thickness and weight of the cup's base.
  • the graph also shows the effect of reducing the thickness of the top and mid-wall sections of the container in driving down the cost curve.
  • Figure 3 shows the same curve based upon actual data for UK-supplied tinplate of the type commonly used in can-making.
  • 0.285 mm represents the optimum thickness on cost grounds, with the use of thinner gauge material increasing net overall costs for can production.
  • the graph of figure 3 shows the percentage increase in overall cost per 1,000 cans when deviating from the 0.285 mm optimum ingoing gauge thickness.
  • the final resulting cup of the invention has the benefits of a thinner (and therefore lighter) base. Also, the material transferred from the base is able to contribute to maximising the sidewall height. In this way, the invention provides an increased enclosed cup volume for a given amount of metal - relative to known methods of manufacturing cup-sections for two-piece containers. Additionally, the cost of manufacturing each container (on a cost per tonne or unit volume basis) is reduced because the invention allows thicker (and therefore cheaper) gauge material to be used for the metal sheet used to form the cup.
  • annular clamping comprises clamping an annular region of the base of the cup (the enclosed portion then being that part of the base located radially inward of the clamped region) (see figures 6a and 6b ).
  • the stretching operation comprises providing a "stretch” punch and moving either or both of the “stretch” punch and the cup toward each other so that the "stretch” punch deforms and stretches the enclosed portion.
  • the "stretch” punch is a single punch having an end face which, when urged into contact with the base of the cup, both deforms and stretches the base.
  • the end face of the "stretch” punch is provided with a non-planar profile, either or both of the "stretch” punch and the cup moved towards each other so that the "stretch” punch deforms and stretches the enclosed portion into a corresponding non-planar profile.
  • the end face would be provided with a domed or part-spherical profile, which in use acts to stretch and deform the enclosed portion into a correspondingly domed or part-spherical profile.
  • figure 4 shows the variation in the base thickness in the stretched cup resulting from use of a single "stretch" punch provided with a domed profiled end face for a cup of approximately 47.5 mm radius (95 mm diameter).
  • the material had an ingoing gauge thickness of 0.115 inches (2.9 mm), with the minimum base thickness after the stretching operation being 0.086 inches (2.2 mm), representing a 25% peak reduction in base thickness.
  • the degree of base thinning resulting from the stretching operation was non-uniform across the diameter of the base. Varying the profile of the end face of the punch has been found to affect the base thickness profile and, in particular, the location of maximum base thinning.
  • the end face of the punch may have compound radii or be oval in profile.
  • the "stretch" punch preferably comprises an end face having one or more relief features.
  • the end face may include one or more recesses or cut-outs (see figure 9 ).
  • the "stretch” punch may instead comprise a punch assembly, the assembly comprising a first group of one or more punches opposing one surface of the enclosed portion and a second group of one or more punches opposing the opposite surface of the enclosed portion, the stretching operation comprising moving either or both of the first and second groups towards each other to deform and stretch the enclosed portion.
  • a punch assembly may, for example, allow the enclosed portion to be deformed into an undulating profile, which may allow the enclosed portion to be stretched in a more uniform manner than that shown in figure 4 (see the example shown in figure 8 ).
  • the stretching operation may instead be achieved by spinning.
  • the spinning may comprise use of a profiled tool that is rotatably and/or pivotally mounted, the tool and enclosed portion of the cup being bought into contact with each other, with either or both of the profiled tool and cup being rotated and/or pivoted relative to each other such that profiled tool progressively profiles and stretches the enclosed portion.
  • the drawing operation on the stretched cup has the benefit of maximising the container height and volume for a given amount of raw material.
  • the drawing operation is conveniently performed by drawing the cup through one or a succession of draw dies, to transfer material from the stretched and thinned base into the sidewall, thereby increasing the height of the sidewall and resulting in the base of the drawn cup having a thickness less than the ingoing gauge of the metal sheet.
  • the drawing operation may be performed using a bodymaker/press having one or a succession of draw dies.
  • the drawing operation would comprise drawing the cup through one or a succession of draw dies, to draw material from the stretched and thinned base into the sidewall, thereby increasing the height of the sidewall and resulting in the base of the drawn cup having a thickness less than the ingoing gauge of the metal sheet.
  • the cup which is fed into the stretching operation is formed by an initial drawing operation performed prior to the stretching operation, the initial drawing operation comprising drawing a metal sheet into a cup profile.
  • the drawing operation following stretching would be a re-drawing operation.
  • the initial drawing operation preferably a blank is first cut from the metal sheet, the blank then drawn into a cup profile.
  • the initial drawing operation comprises first slidably clamping the blank at a location between a draw die and a "draw” punch, the "draw” punch adapted to move through the draw die, either or both of the "draw” punch and draw die being co-axially moved towards each other so that the "draw” punch draws the blank against the forming surface of the draw die to form the cup.
  • slidably clamping is meant that the clamping load during drawing is selected so as to permit the blank to slide, relative to whatever clamping means is used (e.g. a draw pad), in response to the deforming action of the drawing die on the blank.
  • a clamping means e.g. a draw pad
  • An intention of this slidable clamping is to prevent or restrict wrinkling of the material during this initial drawing operation.
  • the same principles apply to the (re-)drawing operation that follows the stretching operation.
  • This initial drawing operation to form the cup may simply be performed in a conventional cupping press using a combination of a "draw" punch and draw die.
  • the initial drawing operation is not limited to use of a conventional draw punch/draw die arrangement.
  • the drawing operation may comprise blow-forming using compressed air/gases or liquids to draw the blank against the draw die or a mould into the shape of the cup.
  • these same alternatives may be used to perform the (re-)drawing operation that follows the stretching operation.
  • the initial drawing and the (re-)drawing operations encompass any means of applying a drawing force.
  • a second aspect of the invention relates to an apparatus for working the method of the invention.
  • apparatus encompasses not only a single plant item, but also includes a collection of discrete plant items that, collectively, are able to work the claimed method of the invention (e.g. similar to the assembly line of a car plant, with successive operations performed by different items of plant).
  • an apparatus for manufacture of a metal cup comprising:
  • the clamping element may be in the form of a continuous annular sleeve; alternatively, it may be a collection of discrete clamping elements distributed in an annular manner to act against either or both of the sidewall and the base.
  • the clamping element is adapted to clamp an annular region of the base of the cup, with the enclosed portion being that part of the base located radially inward of the clamped annular region.
  • the stretch tool comprises a "stretch” punch, the apparatus adapted to move either or both of the “stretch” punch and the cup toward each other so that the "stretch” punch deforms and stretches the enclosed portion.
  • the "stretch” punch may simply be a single punch having an end face which, in use, is urged against the enclosed portion of the cup to perform the stretching operation. Trials have been performed using a single punch as the "stretch” punch, the end face of the single punch having a domed or generally part-spherical profile which, in use, stretches the enclosed portion into a correspondingly shaped domed or part-spherical profile.
  • the end face of the punch may have compound radii or be oval in profile.
  • the "stretch" punch may preferably comprise an end face having one or more relief features.
  • the end face may include one or more recesses or cut-outs (see figure 9 ).
  • the "stretch" punch comprises a punch assembly, the assembly comprising a first group of one or more punches opposing one surface of the enclosed portion and a second group of one or more punches opposing the opposite surface of the enclosed portion, the first and second groups moveable towards each other to deform and stretch the enclosed portion.
  • the drawing operation is conveniently performed by drawing the cup through one or a succession of draw dies, to transfer material from the stretched and thinned base into the sidewall, thereby increasing the height of the sidewall and resulting in the base of the drawn cup having a thickness less than the ingoing gauge of the metal sheet.
  • the means for drawing may preferably comprise a draw punch (or succession of punches) and corresponding draw die(s).
  • the apparatus further comprises means for initially drawing a metal sheet to form the cup for the stretching operation.
  • the means for initially drawing the metal sheet comprises a draw die, a "draw” punch and means for slidably clamping the metal sheet at a location between the draw die and the "draw” punch.
  • the drawing operation following stretching would be a re -drawing operation.
  • the apparatus further comprises one or a succession of ironing dies to reduce the thickness of the sidewall and thereby increase the height of the sidewall.
  • the method and apparatus of the invention are not limited to a particular metal. They are particularly suitable for use with any metals commonly used in DWI (D&I) and DRD processes. Also, there is no limitation on the end use of the cup that results from the method and apparatus of the invention. Without limitation, the cups may be used in the manufacture of any type of container, whether for food, beverage or anything else. However, the invention is particularly beneficial for use in the manufacture of containers for food, especially with regard to the cost savings that can be made relative to known manufacturing techniques.
  • Figure 1 is a side elevation view of a container body of the background art resulting from a conventional DWI process. It shows the distribution of material in the base and sidewall regions of the container body.
  • Figure 2 is a graph showing in general terms how the net overall cost of manufacturing a typical two-piece metal container varies with the ingoing gauge of the sheet metal. The graph shows how reducing the thickness of the sidewall region (e.g. by ironing) has the effect of driving down the net overall cost.
  • Figure 3 is a graph corresponding to figure 2 , but based on actual price data for UK-supplied tinplate.
  • Figure 4 is a graphical representation of the variation in base thickness of a cup resulting from use of a "stretch” punch (according to the invention) having a domed profiled end face.
  • Figure 5a is a side elevation view of the tooling of a cupping press used to form a first stage cup from a sheet metal blank. The figure shows the tooling before the initial drawing operation has commenced.
  • Figure 5b corresponds to figure 5a , but on completion of the initial drawing operation to form the first stage cup.
  • Figure 6a is a side elevation view of a stretch rig used to perform the stretching operation of the invention. The figure shows the stretch rig before the stretching operation has commenced.
  • Figure 6b shows the stretch rig of figure 6a , but on completion of the stretching operation.
  • Figure 7 shows an alternative embodiment to that of figures 6a and 6b , in which the pre-stretched cup is clamped about its sidewall for the stretching operation.
  • Figure 8 shows an alternative embodiment of stretch punch to that shown in figures 6a and 6b .
  • Figure 9 shows a further alternative embodiment of stretch punch to those shown in figures 6a , 6b and 8 , where the end face of the stretch punch includes various relief features.
  • Figures 10a-d show perspective views of a bodymaker assembly used to re-draw the stretched cup. The figures show the operation of the bodymaker from start to finish of the stretching operation.
  • Figure 11 shows a detail view of the re-draw die used in the bodymaker of figures 10a-d .
  • Figure 12 shows the sheet metal blank at various stages during the method of the invention as it progresses from a planar sheet to a finished cup.
  • Figure 13 shows the use of the cup of the invention as part of a two-piece container.
  • a cupping press 10 has a draw pad 11 and a draw die 12 (see figures 5a and 5b ).
  • a draw punch 13 is co-axial with the draw die 12, as indicated by common axis 14.
  • a circumferential cutting element 15 surrounds the draw pad 11.
  • a flat section of metal sheet 20 is held in position between opposing surfaces of the draw pad 11 and the draw die 12.
  • Steel tin-plate (Temper 4) with an ingoing gauge thickness (t in-going ) of 0.280 mm has been used for the metal sheet 20.
  • the section of metal sheet 20 is typically cut from a roll of metal sheet (not shown). After the section of metal sheet 20 has been positioned, the circumferential cutting element 15 is moved downwards to cut a circular planar blank 21 out from the metal sheet (see figure 5a ). The excess material is indicated by 22 on figure 5a .
  • the draw punch 13 is moved axially downwards through the draw die 12 to progressively draw the planar blank against the forming surface 16 of the draw die into the profile of a cup 23 having a sidewall 24 and integral base 25.
  • This drawing operation is shown in figure 5b , and includes a separate view of the drawn cup 23 when removed from the press 10.
  • a detail view is included in figure 5a of the radius R 12 at the junction between the end face of the draw die 12 and its forming surface 16.
  • the radius R 12 and the load applied by the draw pad 11 to the periphery of the blank 21 are selected to permit the blank to slide radially inwards between the opposing surfaces of the draw pad 11 and draw die 12 and along forming surface 16 as the draw punch 13 moves progressively downwards to draw the blank into the cup 23. This ensures that the blank 21 is predominantly drawn, rather than stretched (thinned) (or worse, torn about the junction between the end face of the draw die and the forming surface).
  • the wall thickness of the cup 23 will be essentially unchanged from that of the ingoing gauge of the blank 21, i.e.
  • the drawn cup 23 is transferred to a stretch rig 30, an example of which is illustrated in figures 6a and 6b .
  • the stretch rig 30 has two platens 31, 32 that are moveable relative to each other along parallel axes 33 under the action of loads applied through cylinders 34 (see figures 6a and 6b ).
  • the loads may be applied by any conventional means, e.g. pneumatically, hydraulically or through high-pressure nitrogen cylinders.
  • a stretch punch 35 and a clamping element in the form of an annular clamp ring 36 On platen 31 is mounted a stretch punch 35 and a clamping element in the form of an annular clamp ring 36.
  • the annular clamp ring 36 is located radially outward of the stretch punch 35.
  • the stretch punch 35 is provided with a domed end face (see figures 6a and 6b ).
  • the cup holder 37 is a tubular insert having an annular end face 38 and an outer diameter corresponding to the internal diameter of the drawn cup 23 (see figures 6a and 6b ).
  • the drawn cup 23 is mounted on the cup holder 37 so that the annular end face 38 contacts a corresponding annular region 26 of the cup's base 25 (see figures 6a and 6b ).
  • Loads are applied via cylinders 34 to move platens 31, 32 towards each other along axes 33 until the annular region 26 is clamped firmly in an annular manner between the planar surface of the clamp ring 36 and the annular end face 38 of the cup holder 37.
  • the clamped annular region 26 defines an enclosed portion 27 of the cup.
  • the annular clamping thereby separates the base 25 into two discrete regions: the clamped annular region 26 and the enclosed portion 27.
  • the stretch punch 35 is then moved axially through the clamp ring 36 to progressively deform and stretch (thin) the enclosed portion 27 into a domed profile 28.
  • the enclosed portion 27 is domed inwardly 28 into the cup (see figure 6b ).
  • the enclosed portion 27 may instead be domed outwardly outside of the cup.
  • the clamping loads applied during this stretching operation are sufficient to ensure that little or no material from the clamped annular region 26 (or the sidewall 24) flows into the enclosed portion 27 during stretching. This helps to maximise the amount of stretching and thinning that occurs in the domed region 28.
  • this stretching operation and the resulting thinning of the base 25 is critical to achieving the object of the invention, namely to make a cup or container body having a base thickness which is less than that of the ingoing gauge of the metal sheet.
  • FIG 7 shows an annular region 26 of the sidewall adjacent the base being clamped between cup holder 370 and clamping element 360. Either or both of the cup holder 370 and clamping element 360 may be segmented to facilitate the clamping of the sidewall, and to accommodate cups of different sizes.
  • the annular clamping of the sidewall 24 defines an enclosed portion 27 inward of the clamped annular region 26 (see figure 7 ).
  • a stretch punch 35 is also indicated in figure 7 . Note that other features of the stretch rig are excluded from figure 7 for ease of understanding.
  • the single stretch punch 35 is replaced by a punch assembly 350 (as shown in figure 8 ).
  • the punch assembly 350 has:
  • figure 8 only shows the punch assembly 350 and the drawn cup 23. Although not shown on figure 8 , in use, an annular region 26 of the cup's base 25 would be clamped during the stretching operation in a similar manner to the embodiment shown in figures 6a and 6b .
  • the first and second groups of punch elements 352, 353 face opposing surfaces of the enclosed portion 27.
  • the stretching operation is performed by moving both first and second groups of punch elements 351, 352 towards each other to deform and stretch (thin) the enclosed portion 27.
  • the enclosed portion 27 is deformed into an undulating profile 29 (see figure 8 ).
  • a single stretch punch 35 has a number of relief features in the form of recesses/cut-outs 353 provided in its end face (see figure 9 ).
  • alternative configurations of recess/cut-out may be used.
  • the stretched cup with its thinned and domed region 28 in the base is transferred to a bodymaker assembly 40 (see figures 10a to 10d ).
  • the bodymaker assembly 40 comprises two halves 41, 42 (indicated by arrows in figures 10a to 10d ).
  • the first half 41 of the bodymaker assembly 40 has a tubular re-draw punch 43 mounted on the same axis as circumferential clamp ring 44.
  • the clamp ring 44 circumferentially surrounds the re-draw punch 43 like a sleeve.
  • the re-draw punch 43 is moveable through and independently of the circumferential clamp ring 44.
  • the second half 42 of the bodymaker assembly 40 has a re-draw die 45.
  • the re-draw die 45 has a tubular portion having an outer diameter corresponding to the internal diameter of the stretched cup 23 (see figure 10a ).
  • the re-draw die 45 has a forming surface 46 along its inner axial surface, which terminates in an annular end face 47 (see figures 10a to 10d ).
  • the annular end face 47 of the re-draw die 45 corresponds in width to that of the annular region 26 of the base of the stretched cup.
  • the stretched cup 23 is first mounted on the re-draw die 45 (as shown on figure 10a ). Then, as shown in figure 10b , the two halves 41, 42 of the bodymaker assembly 40 are moved axially relative to each other so that the annular region 26 of the base of the stretched cup is clamped between the annular end face 47 of the re-draw die 45 and the surface of the circumferential clamp ring 44.
  • the re-draw punch 43 is then forced axially through the clamp ring 44 and the re-draw die 45 (see arrow A on figures 10c and 10d ) to progressively re-draw the material of the stretched cup along the forming surface 46 of the re-draw die.
  • the use of the re-draw die 45 has two effects:
  • Figure 10d shows the final state of the re-drawn cup 23 when the re-draw punch 43 has reached the end of its stroke. It can clearly be seen that the formerly domed region 28 of the base has been pulled essentially flat, to provide a cup or container body 23 where the thickness of the base 25 is thinner than that of the ingoing blank 21. As stated earlier, this reduced thickness in the base 25 - and the consequent weight reduction - is enabled by the stretching operation performed previously.
  • the junction between the forming surface 46 and the annular end face 47 of the re-draw die is provided with a radius R 45 in the range 1 to 3.2 mm.
  • the provision of a radius R 45 alleviates the otherwise sharp corner that would be present at the junction between the forming surface 46 and the annular end face 47, and thereby reduces the risk of the metal of the stretched cup 23 tearing when being re-drawn around this junction.
  • figures 10a to 10d show use of a tubular re-draw punch 43 having an annular end face
  • the punch may alternatively have a closed end face.
  • the closed end face may be profiled to press a corresponding profile into the base of the cup.
  • Figure 12 shows the changes undergone by the metal blank 21 from a) before any forming operations have been undertaken, to b) forming into the first stage cup in the cupping press 10, to c) the stretching and thinning operation performed in the stretch rig 30, to d) the re-drawn cup that results from the bodymaker assembly 40.
  • a location on the domed region 28 of the stretched cup is indicated as X on figure 12 .
  • the figure illustrates the effect of the re-drawing operation in radially pulling out X to X'.
  • the figure shows that the base of the cup at that location after stretching (t stretch ) (and after the re-drawing operation) has a reduced thickness relative to the ingoing gauge of the blank 21 (t in-going ), i.e. t stretch ⁇ t in-going .
  • this thinning of the base is enabled by the stretching operation.
  • the re-drawn cup may also undergo ironing of the sidewalls by being drawn through a succession of ironing dies (not shown). This ironing operation has the effect of increasing the height and decreasing the thickness of the sidewall, and thereby maximising the enclosed volume of the cup.
  • Figure 13 shows a container 100 where the final resulting cup 23 has undergone an ironing operation to form container body 110.
  • the container body 110 is flared outwardly 111 at its access opening.
  • Can end 120 is provided with a seaming panel 121, the seaming panel enabling the can end to be fastened to the container body by seaming to the flared portion 111.

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  • Mechanical Engineering (AREA)
  • Table Devices Or Equipment (AREA)
  • Wrappers (AREA)
  • Corsets Or Brassieres (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP10152593A 2010-02-04 2010-02-04 Fabrication de boîtes Withdrawn EP2353746A1 (fr)

Priority Applications (36)

Application Number Priority Date Filing Date Title
EP10152593A EP2353746A1 (fr) 2010-02-04 2010-02-04 Fabrication de boîtes
US12/759,298 US8313003B2 (en) 2010-02-04 2010-04-13 Can manufacture
PH1/2012/501527A PH12012501527A1 (en) 2010-02-04 2011-02-04 Can manufacture
AU2011212418A AU2011212418B2 (en) 2010-02-04 2011-02-04 Can body
MX2012009020A MX2012009020A (es) 2010-02-04 2011-02-04 Cuerpo de lata.
RU2012137494/12A RU2566941C2 (ru) 2010-02-04 2011-02-04 Корпус банки
IN6690DEN2012 IN2012DN06690A (fr) 2010-02-04 2011-02-04
JP2012551643A JP2013518724A (ja) 2010-02-04 2011-02-04 缶胴
JP2012551636A JP2013518723A (ja) 2010-02-04 2011-02-04 缶製造
PCT/EP2011/051666 WO2011095595A1 (fr) 2010-02-04 2011-02-04 Fabrication d'une boîte
PCT/EP2011/051695 WO2011095613A1 (fr) 2010-02-04 2011-02-04 Corps de boîte
US13/577,172 US9545655B2 (en) 2010-02-04 2011-02-04 Can manufacture
CA2787546A CA2787546C (fr) 2010-02-04 2011-02-04 Fabrication d'une boite
NZ601599A NZ601599A (en) 2010-02-04 2011-02-04 Can manufacture
CN201180016908.6A CN102858643B (zh) 2010-02-04 2011-02-04 罐身
DK11702635.1T DK2531409T3 (en) 2010-02-04 2011-02-04 Canned body
MX2012009023A MX337296B (es) 2010-02-04 2011-02-04 Fabricacion de latas.
EP11702226.9A EP2531310B1 (fr) 2010-02-04 2011-02-04 Fabrication de boites
AU2011212400A AU2011212400B2 (en) 2010-02-04 2011-02-04 Can manufacture
RU2012137507/02A RU2557845C2 (ru) 2010-02-04 2011-02-04 Изготовление жестяной банки
BR112012019170A BR112012019170A2 (pt) 2010-02-04 2011-02-04 corpo de lata.
BR112012019014A BR112012019014A2 (pt) 2010-02-04 2011-02-04 método para fabricar um copo de metal , aparelho para fabricação de um copo de metal , corpo de recipiente , e, recipiente
MYPI2012003371A MY164686A (en) 2010-02-04 2011-02-04 Can manufacture
CA2789110A CA2789110C (fr) 2010-02-04 2011-02-04 Corps de boite
CN201180008424.7A CN102725079B (zh) 2010-02-04 2011-02-04 罐的制造
NZ601598A NZ601598A (en) 2010-02-04 2011-02-04 Can body
ES11702226T ES2741590T3 (es) 2010-02-04 2011-02-04 Fabricación de botes de conserva
ES11702635.1T ES2583266T3 (es) 2010-02-04 2011-02-04 Cuerpo de lata
HUE11702635A HUE030556T2 (en) 2010-02-04 2011-02-04 Can body
PL11702635T PL2531409T3 (pl) 2010-02-04 2011-02-04 Korpus puszki
EP11702635.1A EP2531409B1 (fr) 2010-02-04 2011-02-04 Corps de canette
UAA201210431A UA110474C2 (ru) 2010-02-04 2011-04-02 Спосіб і установка для виготовлення металевої чаші, корпус контейнера, що містить чашу, і контейнер
ZA2012/05621A ZA201205621B (en) 2010-02-04 2012-07-25 Can manufacture
CO12128378A CO6612237A2 (es) 2010-02-04 2012-07-31 Cuepro de lata
CO12128382A CO6551761A2 (es) 2010-02-04 2012-07-31 Fabricación de latas
US13/653,735 US9334078B2 (en) 2010-02-04 2012-10-17 Can manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10152593A EP2353746A1 (fr) 2010-02-04 2010-02-04 Fabrication de boîtes

Publications (1)

Publication Number Publication Date
EP2353746A1 true EP2353746A1 (fr) 2011-08-10

Family

ID=42244776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10152593A Withdrawn EP2353746A1 (fr) 2010-02-04 2010-02-04 Fabrication de boîtes

Country Status (2)

Country Link
EP (1) EP2353746A1 (fr)
UA (1) UA110474C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2851140A1 (fr) * 2013-09-20 2015-03-25 Crown Packaging Technology Inc Production d'extrémité de canette
CN110217464A (zh) * 2019-06-29 2019-09-10 广州荣鑫容器有限公司 一种可灌装568-580ml的金属罐及其制作方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602411A (en) * 1949-08-02 1952-07-08 Michael S Schnell Means for drawing material
US4095544A (en) 1976-10-26 1978-06-20 National Steel Corporation Production of corrosion resistant seam-free can bodies from tinplate
EP0425704A1 (fr) * 1989-05-17 1991-05-08 Toyo Seikan Kaisha, Ltd. Fabrication de boites etirees/embouties
WO2002045882A1 (fr) * 2000-12-04 2002-06-13 Corus Uk Limited Contenant metallique conçu pour recevoir un constituant de chauffage ou de refroidissement et procede de fabrication de celui-ci
US20020074867A1 (en) * 2000-12-13 2002-06-20 Yoshiaki Matsuura Yoke of electric rotating machine and method of manufacturing same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602411A (en) * 1949-08-02 1952-07-08 Michael S Schnell Means for drawing material
US4095544A (en) 1976-10-26 1978-06-20 National Steel Corporation Production of corrosion resistant seam-free can bodies from tinplate
EP0425704A1 (fr) * 1989-05-17 1991-05-08 Toyo Seikan Kaisha, Ltd. Fabrication de boites etirees/embouties
WO2002045882A1 (fr) * 2000-12-04 2002-06-13 Corus Uk Limited Contenant metallique conçu pour recevoir un constituant de chauffage ou de refroidissement et procede de fabrication de celui-ci
US20020074867A1 (en) * 2000-12-13 2002-06-20 Yoshiaki Matsuura Yoke of electric rotating machine and method of manufacturing same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2851140A1 (fr) * 2013-09-20 2015-03-25 Crown Packaging Technology Inc Production d'extrémité de canette
WO2015040032A1 (fr) * 2013-09-20 2015-03-26 Crown Packaging Technology, Inc. Production d'extrémité de boîte
CN105555431A (zh) * 2013-09-20 2016-05-04 皇冠包装技术公司 罐体端部的制造
US10518314B2 (en) 2013-09-20 2019-12-31 Crown Packaging Technology, Inc. Can end production
CN110217464A (zh) * 2019-06-29 2019-09-10 广州荣鑫容器有限公司 一种可灌装568-580ml的金属罐及其制作方法
CN110217464B (zh) * 2019-06-29 2024-01-23 广州荣鑫容器有限公司 一种568-580ml金属罐的制作方法

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