EP3501683A1 - Verfahren zur herstellung einer metalldose - Google Patents

Verfahren zur herstellung einer metalldose Download PDF

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Publication number
EP3501683A1
EP3501683A1 EP17210346.7A EP17210346A EP3501683A1 EP 3501683 A1 EP3501683 A1 EP 3501683A1 EP 17210346 A EP17210346 A EP 17210346A EP 3501683 A1 EP3501683 A1 EP 3501683A1
Authority
EP
European Patent Office
Prior art keywords
cup
temperature
blank
drawn
wall ironing
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Withdrawn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
EP17210346.7A
Other languages
English (en)
French (fr)
Inventor
Henri Kwakkel
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.)
Tata Steel Ijmuiden BV
Original Assignee
Tata Steel Ijmuiden BV
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 Tata Steel Ijmuiden BV filed Critical Tata Steel Ijmuiden BV
Priority to EP17210346.7A priority Critical patent/EP3501683A1/de
Publication of EP3501683A1 publication Critical patent/EP3501683A1/de
Withdrawn legal-status Critical Current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
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies
    • B21D22/286—Deep-drawing of cylindrical articles using consecutive dies with lubricating or cooling means
    • 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
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing

Definitions

  • the invention relates to a method of forming a metal can, more in particular a method of forming a steel can from a coated steel sheet.
  • in can making sheet metal is formed into finished cans in which the important steps for two-part cans are cutting a blank from the steel sheet, deep drawing of the blank into a cup and wall ironing of the cup into a can with a predefined wall thickness. After the wall ironing step further steps may include the trimming, bottom forming, flanging, beading of the can and finally putting a closure on the can.
  • a blank is cut from the metal sheet the shape of which is dependent on what the final shape of the can should be. Most cans are of a circular cross-section for which a round disc is cut from the metal sheet. Subsequently, the blank is subjected in the cupper to a deep drawing step wherein a cup is formed with a diameter of the bottom part larger than that of the final can to be formed as well as with a height of the wall far less than that of the final can.
  • a redraw step wherein the cup is subjected to a second deep drawing step, the re-draw step, wherein the diameter of the bottom part is reduced and the height of the wall increased.
  • the cup is subjected to a wall ironing step in which the thickness of the wall is reduced therewith increasing the height of the wall.
  • a number of successive wall ironing steps are carried out to realise a wall height slightly larger than the height of the final can.
  • the invention relates to a method of forming a metal can as defined in claims 1 - 15.
  • One or more of the objectives of the invention are realized by providing a method of forming a metal can comprising the steps of:
  • polymer coated cans comprise one sided and two sided coated cans with a single or multi-layered polymer coating. The polymer coating on opposite sides may be different in the number of coating layers and the layers of the coating may be of different chemical composition.
  • a cupper and a bodymaker are used wherein in the cupper a blank is cut and deep drawn into a cup and wherein the further forming steps are carried out in the bodymaker comprising a re-draw step and immediately thereafter one or more wall ironing steps. Since re-drawing generates heat the temperature of the re-drawn cup increases already considerably immediately before the wall ironing step the end temperature of the re-drawn can is very likely to be above the critical temperature of a polymer coating. Although it would be possible to integrate an extra cooling step between the re-draw step and the first wall ironing step in addition to the normal cooling of the bodymaker this would mean large and costly modifications to the bodymaker.
  • the drawn cup is ready to be processed in existing second devices.
  • the inner diameter of the cup corresponds to the outer diameter of the punch sleeve with which the cup is drawn through the successive ironing die rings.
  • the drawn cup is cooled before subjecting the drawn cup to the wall ironing step.
  • the drawn cup is conveyed from the first device to the second device and wherein the drawn cup is cooled from a first temperature to a second temperature during conveyance of the drawn cup to the second device.
  • the conveying speed and distance over which the drawn cup is conveyed from the first device to the second device is such that there is sufficient time to cool the cup to the second temperature. Cooling down the drawn cup to the second temperature when conveying the drawn cup to the second device can be carried out in a number of different ways for instance cooling by using a cold liquid, like for instance water, or by using cold air. Although very well possible this again requires further equipment which needs to be built in the can making line.
  • cooling is carried out by exposing the drawn cup to ambient air during conveyance of the cup from the first to the second device.
  • the temperature of the steel sheet increases considerably during the drawing step, but because the drawn cups are formed out of relatively thin sheet metal the amount of heat energy stored in a drawn cup is not very large. Moreover, because of the ratio between relatively limited thickness of the sheet material and large surface area of the drawn cup the heat stored in the drawn cup is rapidly lost. In typical can making lines the conveying distance between first and second device is large enough and because of that enough conveying time between successive forming devices to sufficiently cool the drawn cans.
  • the second temperature is ambient temperature or ambient temperature with a tolerance range of +10°C or a tolerance range of +20°C.
  • Ambient temperature is to be understood as a temperature in a range of 5 - 30°C, depending largely on the temperature in the production facility.
  • the second temperature should preferably be at most 40°C and more preferably at most 30°C.
  • the maximal possible draw ratio is in the range of 1.9 - 2.1, wherein the draw ratio is the blank diameter divided by the cup diameter, and for that reason a smaller blank is used for a cup with an inner diameter corresponding to the inner diameter of the final can.
  • the wall height of the cup after the single drawing step according to the method will be lower than with the conventional method with a re-draw step.
  • the lower height of the cup wall is compensated by providing a blank with a larger thickness than would be used for the same can in the conventional forming process, and subject the wall with the larger thickness to a larger ironing reduction to arrive at a can with the same thickness as a can made according to the conventional process.
  • the larger reduction of the wall thickness in wall ironing the cup is carried out in multiple successive steps. Because of the low temperature of the drawn cup when arriving at the second device, which is about ambient temperature, it is possible to subject the drawn cup to the necessary number of successive ironing steps to realise the required larger ironing reduction.
  • the wall ironing of the cup is controlled such that the temperature of the cup does not exceed a temperature of 225°C, preferably does not exceed a temperature of 200°C. Above the 225°C limit the coating will almost certainly be damaged and to be on the safe side and prevent any damage it is provided that the temperature does not exceed the 200°C limit. Control of the temperature as far as necessary can be done by increasing the cooling realised by the standard cooling system present in the second device.
  • the wall ironing of the cup is carried out in at most 5 successive ironing steps, typically in at most 4 successive ironing steps.
  • the temperature of the drawn cup at the start of wall ironing of the cup will be sufficiently decreased to be able to carry out the necessary wall ironing steps to realise the required wall height of the can without exceeding the predefined temperature limit.
  • the blank diameter for a given can diameter is in a range of 80 - 95%, typically in a range of 85 - 92% of a blank diameter used in a method comprising a re-draw step in the second device.
  • a reduced diameter more blanks can be cut from a metal sheet though the metal sheet has to be thicker in order to make a can of the same standard dimensions.
  • the draw ratio in the single drawing step is in a range of 1.9 - 2.1, typically in a range of 1.9 - 2.0. This is about the maximum or close to the maximum possible draw ratio without the chance that any wrinkling or other negative drawing effects will occur.
  • the blank has an initial thickness which is a factor 1.2 - 2.0, typically 1.3 -1.8, larger compared to the thickness of a blank used in a method comprising a redraw step in the second device.
  • the total reduction in the wall ironing step is in a range of 50 -70%, typically in a range of 55 - 65%.
  • first device 1 In fig.1 part of a first device 1 is shown in a first position at the left half of the figure and in a second position at the right half of the figure.
  • the first device 1 has a cutter 2 with a cutting tool 3 to cut a blank 4 from a metal sheet 5.
  • a cutting tool 3 At the left half of the figure blank 4 is cut from metal sheet 5 and clamped between blank holder 6 and die 7.
  • a punch 8 is in a position directly above blank 4.
  • punch 8 has been pushed in downward direction, as seen in the figure, therewith drawing blank 4 into a cup 9.
  • the diameter of punch 8 corresponds to the diameter of the punch 11 in the second device 10 (see fig.2 ), the device for the wall ironing of cup 9.
  • FIG.2 a schematic cross section is shown of the second device 10 for the wall ironing of cup 9.
  • Device 10 is provided with a punch 11 guided in sleeve 12 and a number of wall ironing rings 13,14,15,16, a stripper tool 17 and a domer tool 18.
  • the second device 10 does not comprise a redraw die for a re-draw step in which a cup is re-drawn to a smaller diameter and increased wall height.
  • the cup 9 conveyed from the first device 1 to the second device 10 already has an inner diameter corresponding to the diameter of punch 11 and is directly subjected to the wall ironing step in second device 10.
  • the formed can 18 After passing through all wall ironing rings 13,14,15,16, the formed can 18 arrives at the domer tool in which the bottom of can 18 is formed.
  • the stripper tool 17 allows the withdrawal of punch 11 from can 18, after which formed can 18 is released from second device 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP17210346.7A 2017-12-22 2017-12-22 Verfahren zur herstellung einer metalldose Withdrawn EP3501683A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17210346.7A EP3501683A1 (de) 2017-12-22 2017-12-22 Verfahren zur herstellung einer metalldose

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17210346.7A EP3501683A1 (de) 2017-12-22 2017-12-22 Verfahren zur herstellung einer metalldose

Publications (1)

Publication Number Publication Date
EP3501683A1 true EP3501683A1 (de) 2019-06-26

Family

ID=60811907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17210346.7A Withdrawn EP3501683A1 (de) 2017-12-22 2017-12-22 Verfahren zur herstellung einer metalldose

Country Status (1)

Country Link
EP (1) EP3501683A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112427562A (zh) * 2020-11-02 2021-03-02 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1517732A (en) * 1974-10-11 1978-07-12 American Can Co Manufacture of steel containers
EP1695772A1 (de) * 2003-12-17 2006-08-30 Toyo Seikan Kaisha, Ltd. Verfahren und vorrichtung zur herstellung eines mit kunstharz überzogenen metalldosenkörpers
JP2007275947A (ja) * 2006-04-07 2007-10-25 Daiwa Can Co Ltd 樹脂被覆シームレス缶の製造方法および製造装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1517732A (en) * 1974-10-11 1978-07-12 American Can Co Manufacture of steel containers
EP1695772A1 (de) * 2003-12-17 2006-08-30 Toyo Seikan Kaisha, Ltd. Verfahren und vorrichtung zur herstellung eines mit kunstharz überzogenen metalldosenkörpers
JP2007275947A (ja) * 2006-04-07 2007-10-25 Daiwa Can Co Ltd 樹脂被覆シームレス缶の製造方法および製造装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112427562A (zh) * 2020-11-02 2021-03-02 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法
CN112427562B (zh) * 2020-11-02 2023-09-26 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法

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