US20110179847A1 - Tool for forming the bottom of cans - Google Patents

Tool for forming the bottom of cans Download PDF

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Publication number
US20110179847A1
US20110179847A1 US12/931,190 US93119011A US2011179847A1 US 20110179847 A1 US20110179847 A1 US 20110179847A1 US 93119011 A US93119011 A US 93119011A US 2011179847 A1 US2011179847 A1 US 2011179847A1
Authority
US
United States
Prior art keywords
ejector
downholder
draw tool
deep draw
tool 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.)
Abandoned
Application number
US12/931,190
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English (en)
Inventor
Gerhard Pick
Martin Gaebges
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.)
L Schuler GmbH
Original Assignee
L Schuler GmbH
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 L Schuler GmbH filed Critical L Schuler GmbH
Assigned to SCHULER PRESSEN GMBH & CO. KG reassignment SCHULER PRESSEN GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GAEBGES, MARTIN, PICK, GERHARD
Publication of US20110179847A1 publication Critical patent/US20110179847A1/en
Abandoned 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
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing
    • 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

Definitions

  • the invention resides in a deep-draw tool for forming the bottom of two-part cans, in particular of beverage cans but also of spray cans.
  • Cans are manufactured in large series production where high reliability is important.
  • DE 69802945 T2 and DE 8205933 U1 are concerned with the manufacture of cans, in particular the forming of their bottoms.
  • the beverage cans are produced there in each case in a multi-step shaping process which among others includes a step for the manufacture of the cup shape which is called cup.
  • the unfinished cups are first stretched in a further shaping process and subsequently their bottoms are deformed. This deformation procedure is a deep-draw process which is to be performed on the thin-walled relative delicate not yet cut can.
  • the semi-finished can After completion of the bottom deforming procedure the semi-finished can must be removed from the deep-draw tool and carried away. In the process it must not be stuck in the deep-draw tool nor must it be moving in an uncontrolled manner.
  • a known tool for forming a container bottom, in particular the bottom of a beverage can is provided with an ejector 23 which is of sleeve-like shape and arranged between a downholder 14 and a dome 12 .
  • the ejector 23 is biased by a spring means 26 against the activating direction of a punch 3 with a pre-tensioning force which is substantially lower than the counter force of the downholder.
  • the spring means 26 can be formed by compression springs 27 , 28 which are arranged in axial cavities formed in the front face of the ejector 23 .
  • the ejector force can be changed by changing the compression springs or the number of compression springs.
  • the deep-draw tool includes a plunger with a punch which is adapted to the desired internal shape of the can.
  • the deep draw tool includes in a second tool part a dome which corresponds to a central concave part of the outer body shape of the can.
  • the plunger and the dome are supported so as to be movable relative to each other wherein preferably one of the two mentioned elements, preferably, the dome is stationary.
  • a downholder which is arranged concentrically and supported so as to be movable relative to the dome.
  • the direction of moveability of the down holder is the same as the direction of movement of the plunger.
  • the punch is preferably provided with a shaping surface which faces the bottom of the can.
  • This, for example about conical, shaping surface is preferably adapted to an outer annular zone of the desired bottom shape.
  • the down holder is supported so as to be movable preferably against the force of a draw cushion for example in the form of a pneumatic cylinder. During the deep-draw procedure it holds the bottom at an outer annular area in engagement with the punch and in this way determines or, respectively, controls to a large extent the shaping of the central bottom section.
  • the punch is preferably provided with aeration openings to permit the escape of air from the can when the punch moves into the semi-finished can.
  • the lower tool part includes an ejector which separates the semi-finished can after completion of the bottom shaping step from the central dome and the downholder ring and brings it into a defined position.
  • the extraction device is moved preferably by a relatively weak spring means.
  • the movement performed, generally by the ejector is preferably greater than the stroke of the downholder.
  • the ejector and the downholder end both at an upper plane when the deep draw tool is open.
  • the ejector ends preferably at the lower rim of the shaping surface of the downholder.
  • the ejector moves with each operating stroke over a length corresponding to the sum of the downholder stroke and the ejector stroke.
  • the downholder and the ejector are each annular or sleeve-like structures. They are preferably concentric to each other as well as concentric to the dome arranged in the center.
  • the downholder and the ejector are preferably axially movable relative to each other.
  • the spring means provided for activating the ejector is engaged preferably between the downholder and the ejector.
  • the spring means comprises several compression springs which are arranged in pockets of the ejector which are provided for that purpose and which are oriented axially.
  • FIG. 1 is a schematic representation of a machine for forming cans and bottoms of cans
  • FIG. 2 is a tool utilized in the machine of FIG. 1 for forming container bottoms before the deformation of the container bottom shown in a schematic simplified longitudinal cross-sectional view;
  • FIG. 3 is the tool according to FIG. 2 during the transformation of the container bottom shown in a longitudinal cross-sectional view
  • FIG. 4 is the tool according to FIG. 3 after completion of the transformation procedure of the container bottom with the punch retracted from the bottom part shown in a schematic longitudinal cross-sectional view;
  • FIG. 5 is the tool according to FIG. 3 after completion of the transformation procedure of the container bottom shown in a schematic longitudinal cross-sectional view.
  • FIG. 1 shows a machine 1 which is used in the manufacture of cans and which performs at least the step of forming the can bottoms but, if applicable, also the stretching of the cylindrical body—so-called wall ironing.
  • the machine 1 includes a tool 2 which comprises an upper tool part 3 and a lower tool part 4 .
  • the upper tool part is in the form of a punch 3 and mounted to a plunger 5 which executes a back and forth movement as indicated by the arrow 6 .
  • the lower tool part 4 on the other hand is at least preferably stationary so that the tool 2 is opened and closed constantly in accordance with the periodic movement of the plunger 5 .
  • the tool 2 is shown in FIGS. 2 to 4 in different operating stages.
  • the punch 3 has for example a basic essentially cylindrical shape, wherein its lower front side faces the lower tool part 4 .
  • the punch 3 and the lower tool part 4 may be arranged side-by-side as shown in FIG. 1 or, alternatively, on top of one another or in any other orientation.
  • the front face 7 of the punch 3 is shaped like the inner surface of the container bottom to be formed.
  • a central concave surface area 8 as seen from the outside, is surrounded by an annular rib 9 from which an annular about conical preferably slightly concave outer surface area 10 extends up to the cylindrical outer surface 11 of the punch 3 .
  • the lower tool part 4 includes, corresponding to the punch 3 with its shapes, in particular the shape of the front face 7 , a central stationary dome 12 .
  • the dome 12 has at its side facing the front face 7 , a surface area 13 whose shape corresponds essentially to the shape of the surface area 8 of the punch 3 .
  • the dome 12 is a separate element inserted into the lower tool part 4 and preferably stationarily supported therein. As illustrated in the schematic representation of FIG. 2 .
  • an annular downholder 14 is arranged. At its side facing the punch 3 the downholder 14 is provided with a shaped surface 15 , which is preferably about conical and adapted in its shape to the outer surface 10 of the punch 3 .
  • the shaped surface 15 is provided to apply during the transformation procedure a defined engagement force to an outer area 16 of the bottom 17 of the container 18 which is directed toward the punch 3 in order to control the deformation of the central area of the bottom 17 .
  • the downholder 14 is movably supported in the lower tool part 4 . The direction of movement is indicated by the arrow 19 which also indicates the direction of movement of the punch 3 .
  • a draw cushion 20 is provided, which is, for example, in the form of a pneumatic cylinder. This is in abutment, preferably via several pressure pins 21 , 22 , with the front face of the downholder 14 which faces away from the punch 3 .
  • annular gap Between the downholder 14 and the dome 12 there is preferably an annular gap whose diameter is preferably at least essentially the same as that of the rib 9 .
  • annular gap a sleeve like ejector 23 is arranged which is movable in the direction of the arrow 19 .
  • the ejector 23 has an upper annular front face 24 which is preferably planar and coherent. In its rest position, that is when the deep-draw tool is open, the downholder 14 and the ejector 23 are in their highest possible position. The ejector 23 then abuts an annular shoulder 25 of the downholder 14 .
  • a spring means 26 for example, in the form of a first compression spring 27 , a second compression spring 28 and, if necessary additional compression springs which are not shown hold the ejector in that position. This position is shown separately in FIG. 5 .
  • the upper front face area 24 of the ejector is in this position about at the same level as the upper end 29 of the shaped surface 15 or slightly thereabove.
  • the compression springs 27 , 28 are supported with one end on the ejector 23 and with their other end on the downholder 14 , or respectively, a washer 30 mounted to the downholder 14 .
  • a cavity cut into the ejector 23 for accommodating the first compression spring 27 is provided in FIG. 2 at the left .
  • the respective cavity for the accommodation of the second compression spring 28 is shown hidden.
  • the machine 1 and the tool 2 as described so far operate as follows:
  • FIG. 2 First an unfinished cup-shaped interim blank for forming the container 18 is inserted into the tool 2 and the punch 3 is introduced into the interior thereof. This state is shown in FIG. 2 .
  • the still essentially flat bottom 17 of the container is disposed on the ejector 23 and/or the downholder 14 .
  • the punch 3 moves toward the lower tool part 4 , that is downwardly in FIG. 2 .
  • first the ejector 23 is pushed downwardly and the compression springs 27 , 28 are compressed.
  • the spring compression force however, is substantially smaller than the force of the draw cushion 20 .
  • the outer zone of the bottom 17 is seated on the shaped surface 15 whereby the outer area 16 of the container is engaged between the punch 3 and the downholder 14 .
  • the central section of the bottom 17 is drawn over the surface 13 of the dome 12 .
  • the ejector 23 has reached its lowest possible position with regard to the downholder 14 , wherein the front face 24 has reached or exceeded the lower end 32 of the shaped surface 15 , shown in FIG. 5 by a dashed line 31 .
  • the drawing process is now continued in that the punch 3 is further moved downwardly until the bottom 17 is formed between the surface areas 8 and 13 .
  • the ejector 23 experiences a stroke which corresponds to the sum of the distance between the ends 29 , 32 of the mold surface 15 and the stroke of the downholder 14 .
  • the punch 3 is moved away from the lower tool part 4 and, as a result, out of the container 18 .
  • the downholder 23 in the process last moves the bottom 17 of the container 18 away from the surface 13 . Sticking of the container 18 to the downholder 14 or respectively the shaped surface 15 is then prevented by the ejector 23 .
  • the spring means 26 pushes the container 18 at the rib formed at the bottom thereof upwardly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
US12/931,190 2010-01-27 2011-01-26 Tool for forming the bottom of cans Abandoned US20110179847A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010000235.6 2010-01-27
DE102010000235A DE102010000235B4 (de) 2010-01-27 2010-01-27 Tiefziehwerkzeug zur Formung von Behälterböden

Publications (1)

Publication Number Publication Date
US20110179847A1 true US20110179847A1 (en) 2011-07-28

Family

ID=44167976

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/931,190 Abandoned US20110179847A1 (en) 2010-01-27 2011-01-26 Tool for forming the bottom of cans

Country Status (4)

Country Link
US (1) US20110179847A1 (de)
EP (1) EP2359950A3 (de)
JP (1) JP2011152585A (de)
DE (1) DE102010000235B4 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102641967A (zh) * 2012-05-04 2012-08-22 太仓市弧螺机电有限公司 一种弹性顶件装置
CN104550477A (zh) * 2014-12-31 2015-04-29 广州荣鑫容器有限公司 一种高强薄壁铝合金易拉罐成型模具
CN106270266A (zh) * 2016-08-30 2017-01-04 广东韩江轻工机械有限公司 两片罐罐身生产工艺
US20170291209A1 (en) * 2015-09-02 2017-10-12 Pride Engineering, Llc Floating clamp ring assembly
CN108176749A (zh) * 2017-12-18 2018-06-19 广东寰球智能科技有限公司 一种基于云平台的金属包装拉伸成型机及其降噪检测方法
CN110252925A (zh) * 2019-07-25 2019-09-20 安徽安簧机械股份有限公司 具有环形复合顶杆机构的活塞头锻造模具
CN111229967A (zh) * 2019-05-17 2020-06-05 旭精机工业株式会社 冲压机以及冲压成形方法
US20220305543A1 (en) * 2017-04-25 2022-09-29 Crown Packaging Technology, Inc. Can base forming

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015119174A1 (de) * 2015-11-06 2017-05-11 Schuler Pressen Gmbh Umformvorrichtung sowie Verfahren zum Umformen eines Innenrandes eines Rondenrings
CN105710252A (zh) * 2016-04-14 2016-06-29 句容五星机械制造有限公司 一种改进型自动卸料机构
CN108435952B (zh) * 2018-03-23 2019-05-24 安徽义良罐业科技有限公司 一种茶叶罐加工用冲压底座

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4382737A (en) * 1981-03-05 1983-05-10 Gulf & Western Manufacturing Company Can end making apparatus
US5016463A (en) * 1988-02-05 1991-05-21 Coors Brewing Company Apparatus and method for forming can bottoms
US5272902A (en) * 1990-09-06 1993-12-28 Preferred Machining Corporation Domer assembly for metal containers with nitrogen pressure source

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826382A (en) * 1988-01-11 1989-05-02 Redicon Corporation Method and apparatus for forming container with profiled bottom
JPH089077B2 (ja) * 1989-06-01 1996-01-31 東洋製罐株式会社 １体成形缶の底部の成形方法
GB9719549D0 (en) * 1997-09-16 1997-11-19 Metal Box Plc Base forming
JPH11104764A (ja) * 1997-09-30 1999-04-20 Mitsubishi Materials Corp 缶の製造方法及びその製造装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4382737A (en) * 1981-03-05 1983-05-10 Gulf & Western Manufacturing Company Can end making apparatus
US5016463A (en) * 1988-02-05 1991-05-21 Coors Brewing Company Apparatus and method for forming can bottoms
US5272902A (en) * 1990-09-06 1993-12-28 Preferred Machining Corporation Domer assembly for metal containers with nitrogen pressure source

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102641967A (zh) * 2012-05-04 2012-08-22 太仓市弧螺机电有限公司 一种弹性顶件装置
CN104550477A (zh) * 2014-12-31 2015-04-29 广州荣鑫容器有限公司 一种高强薄壁铝合金易拉罐成型模具
US20170291209A1 (en) * 2015-09-02 2017-10-12 Pride Engineering, Llc Floating clamp ring assembly
US10532390B2 (en) * 2015-09-02 2020-01-14 Pride Engineering, Llc Floating clamp ring assembly
CN106270266A (zh) * 2016-08-30 2017-01-04 广东韩江轻工机械有限公司 两片罐罐身生产工艺
US20220305543A1 (en) * 2017-04-25 2022-09-29 Crown Packaging Technology, Inc. Can base forming
CN108176749A (zh) * 2017-12-18 2018-06-19 广东寰球智能科技有限公司 一种基于云平台的金属包装拉伸成型机及其降噪检测方法
CN111229967A (zh) * 2019-05-17 2020-06-05 旭精机工业株式会社 冲压机以及冲压成形方法
CN110252925A (zh) * 2019-07-25 2019-09-20 安徽安簧机械股份有限公司 具有环形复合顶杆机构的活塞头锻造模具

Also Published As

Publication number Publication date
DE102010000235A1 (de) 2011-09-08
JP2011152585A (ja) 2011-08-11
DE102010000235B4 (de) 2012-01-26
EP2359950A2 (de) 2011-08-24
EP2359950A3 (de) 2014-01-22

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SCHULER PRESSEN GMBH & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PICK, GERHARD;GAEBGES, MARTIN;REEL/FRAME:025728/0859

Effective date: 20110119

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION