EP1663541B1 - Verfahren zum herstellen eines napfförmigen gegenstandes - Google Patents

Verfahren zum herstellen eines napfförmigen gegenstandes Download PDF

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Publication number
EP1663541B1
EP1663541B1 EP04762740A EP04762740A EP1663541B1 EP 1663541 B1 EP1663541 B1 EP 1663541B1 EP 04762740 A EP04762740 A EP 04762740A EP 04762740 A EP04762740 A EP 04762740A EP 1663541 B1 EP1663541 B1 EP 1663541B1
Authority
EP
European Patent Office
Prior art keywords
blank
tool
flange
deformation
cup
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.)
Expired - Lifetime
Application number
EP04762740A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1663541A1 (de
Inventor
Klaus Warmbrunn
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.)
Maiko Engineering GmbH
Original Assignee
Maiko Engineering 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 Maiko Engineering GmbH filed Critical Maiko Engineering GmbH
Priority to PL04762740T priority Critical patent/PL1663541T3/pl
Publication of EP1663541A1 publication Critical patent/EP1663541A1/de
Application granted granted Critical
Publication of EP1663541B1 publication Critical patent/EP1663541B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • 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
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • B21D51/50—Making screw caps

Definitions

  • Such a method is for example from the DD 233 036 A3 known.
  • a similar procedure is in the DE 433 094 A described.
  • Deep drawing is understood to mean the forming of a sheet metal blank (blank, blank) into a hollow body or a hollow body into a hollow body with a smaller circumference, with or without intended change in the sheet thickness.
  • blade blank
  • segments of the blank must be folded up to the cylinder wall and displaced intermediate sections. In this case, radial tensile and tangential compressive stresses occur. When overflowing the cut bell creates a bend.
  • the radially outwardly projecting flange or flange under the action of the tangential compressive stresses not kinks and folds, the kraftbeaufschlagte hold-down is provided.
  • the provided for glass bottles lid are drawn from relatively thin sheets. These sheets are, especially if they are intended for the food industry, varnished and often have advertising imprints on.
  • the problem with the lid production is that when forming in the axially outer region of the cup, the coating breaks and form fine color threads.
  • the cracked paint does not affect the appearance of the lid, as the axial end of the blank is subsequently rolled, so that the torn areas, which are otherwise very fine, are invisible on the finished product.
  • the lacquer threads settle not only in the tools, but also on the edge of the blank, in the tools forms a cotton-like consistency, which must be removed regularly. Also, the threads on the cup, especially at its edge must be carefully removed so that they do not come into contact with the bottling (food) at the bottler, which would not be acceptable.
  • Lids for glass bottles are mass-produced articles, of which large quantities are produced in a mold with high cycle times.
  • the cycle times usually include values of about 300 min -1 .
  • the production plant comprising the tool must be shut down and blown down or cleaned, which prolongs the production time and thus also increases the production costs.
  • the blowing off of the threads must be done very carefully done so that the staff operating the plant is not endangered.
  • the hall in which the systems are installed must also be constantly cleaned of the colored threads.
  • DD 233 036 A3 discloses a method for deep drawing sheet metal parts, in which a first train is followed by a second train within the same press stroke in the same direction, wherein the pulling force of the first train is used as a hold-down force of the second train and reduced with progressive draw depth.
  • the hold-down force is progressively reduced from the beginning of the second turn and completely canceled before the end of the second turn.
  • the method explained in the introduction is intended to be improved so that, especially at high cycle times, threading or earing is significantly reduced or even completely eliminated by reliably ensuring the powerless execution of the pulling out step.
  • a generic method is characterized in that the step of punching out and pulling is performed under force in a first tool and the pulling is interrupted when the flange has reached a defined width (R - r), and then the step of Extracting without force in a second tool without holddown is performed.
  • the invention is based on the finding that the thread formation is not formed when punching out the blank from the sheet due to the high cutting forces, as might be expected, but to the end of deep drawing when the surface pressure on the flange formed between the cut bell and the hold-down is reached very high levels. Due to the defined width (R - r) of the flare, shortly before the surface pressure in this flare reaches values which cause the lacquer layer to crack, the deep drawing or the deformation are interrupted. By tearing the lacquer layer due to the high surface pressure, the lacquer layer would draw threads.
  • the flange then has a width of, for example, a maximum of 3 mm, which is very small compared to the cup height.
  • the deformation or deflection of the flange is then carried out in a second step in a second tool then without applying force to a hold-down, so that when deflecting no surface pressure acts on the hemming.
  • the necessary forming force can be kept very low due to the only small necessary deformation, whereby the tearing of the paint layer is prevented and can form any threads. If, in the second step, a profiling is introduced into the wall of the blank, it is prepared for further processing, for example curling the wall inwards.
  • This process eliminates the downtime and associated costs previously required for cleaning, thereby significantly reducing production costs. Since there are also no threads on the blank, the further step previously necessary for removing the threads and corresponding control steps are also eliminated, which further reduces the production costs. In addition, the earing is reduced. In addition to reducing manufacturing costs, the quality of the products is increased.
  • An advantageous embodiment of the inventive concept provides that the deformation takes place by pulling the flange due to the relative movement between a cutting bell and a drawing block of the second tool.
  • An alternative embodiment of the method according to the invention provides that the deformation takes place by means of a guide cooperating with the second tool.
  • a further alternative embodiment of the method according to the invention provides that the deformation takes place by rolling in a second tool. Rolling enables a simple and efficient forming process to prepare the blank for further processing.
  • the wall is pulled radially outward by the profiling.
  • the profile is deformed by the wall facing radially inward.
  • the radial width of the flange at the end of the first forming step is less than three millimeters, preferably 0.1-1.5 mm, and more preferably 0.5-1.0 mm.
  • the width of the flange is of course dependent on the surface pressure occurring, which in turn depends on the material and the material thickness or sheet thickness and their compatible maximum value is in correlation with the thickness of the ink layer.
  • the best width of the flange is determined in each case for different boundary conditions, such as material, material thickness and the color or lacquer layer, iteratively.
  • FIG. 1 shows the partial section of the center line M symmetrically constructed first thermoforming tool consisting of the cutting ring 1, the cutting bell 2, cooperating with the cutting bell 2 hold-down 3, the drawing block 6 supporting lower part 4 and the embossing block 7.
  • the embossing block 7 and the drawing block 6 with the cutting bell 2 include the blank 8 a.
  • the force of a spring assembly not shown here is transmitted to the hold-3.
  • the production of the blank 8 is carried out according to the prior art with the tool according to FIG. 2 in which the lacquered sheet metal or a cut-out (punched out) thereof by means of the cut ring 1 Ronde is placed on the drawing block 6.
  • the cutting bell 2 punched out a metal plate from the blank.
  • a flange or flange is clamped after transection of the sheet, the width of which is steadily reduced in a further lowering movement of cutting bell 2 and hold-down 3.
  • the surface pressure in the flange increases due to the force F acting on the hold-down device 3.
  • FIG. 3 shows the first tool at the end of the first sub-step of the method according to the invention.
  • the cut bell 2 and the hold-down 3 are moved together relative to the drawing block 6 until a defined surface pressure occurs in the flange 8a of the blank 8, ie, the width of the flange 8a formed from the difference between the outside radius R and the inside radius r has a defined dimension has reached.
  • This defined dimension is less than 3 mm and is preferably 0.1-1.5 mm, and more preferably 0.5-1.0 mm. Compared to the inner radius r of the blank 8, this measure is therefore very small.
  • the two steps of the deep-drawing process according to the invention are carried out in two different tools. Therefore, a conventional first tool can be used, in which the hold-3 is force-loaded, for example via a spring assembly. After completion of the first step, the blank 8 is removed from the first tool and inserted into another, second tool, which either has no hold-down 3, as in FIG. 5 shown, or an existing hold-down 3 is powerless, as in the FIG. 4 is shown.
  • the hold-down device 3 is powerless during the deformation and the cutting bell 2 forms the blank 8 by a further deep-drawing step.
  • a radially outwardly facing profiling 8c is introduced, which ensures the subsequent curling of the wall 8b that in the wall 8b no wrinkles or Einknickept.
  • the inside of the cutting bell 2 and the outside of the drawing block 6 have a profiling 8c corresponding shape.
  • the Indian FIG. 4 shown hold-down 3 is used in the illustrated tool only as a lifter, therefore, to eject after completion of the deformation of the molding by a lifting movement upwards from the tool.
  • FIG. 5 An alternative second tool based on the FIG. 5 is illustrated, differs from that in FIG. 4 shown tool in that is completely dispensed with a hold-down.
  • shock element 9 is provided as a lifter, which ejects by a lifting movement up the molding after completion of the deformation of the tool.
  • the curling of the wall 8b is FIG. 6 removable.
  • the radially outwardly facing profiling 8c is canceled, so that the wall 8b takes a straight course.
  • To increase the stability of the lid of the slightly beaded edge is then further rolled.
  • For a screw cap after completion of the curling at the lower end regularly distributed over the circumference of the cam 8d are pressed, which later interact with the thread attached to the neck of the glass bottle.
  • the first step (see FIG. 3 ) shaped blank 8 has in the lower region of the wall 8b on a radially outwardly facing flare 8a and is placed on a mold block 10.
  • the mold block 10 On its outer circumference, the mold block 10 has a shoulder 11 such that the diameter in the lower region 10a of the mold block 10 is less than the diameter in the upper region 10b.
  • the shoulder 11 is substantially in the region or the height of the bead 8a of the blank 8, when this is placed on the mold block 10.
  • an applicator 12 is brought to the crimp 8a of the blank 8 coming from the outside.
  • the arrow 13 indicates the direction of movement of this approach.
  • the applicator 12 rotates about its longitudinal axis 14, which is inclined inwardly in the height of the flange 8a. That is, the lower portion of the Anrollers has a smaller distance to the mold block 10 than the upper area.
  • the rotation about the longitudinal axis 14 is indicated by the bent arrow 15.
  • the applicator 12 is further guided inwardly until the blank 8 is deflected in the lower region with the flange 8a, so that in the wall 8b, a radially inwardly facing profiling 8e is formed, as in FIG. 7b is shown.
  • the profiling 8e is formed radially inward on the entire outer circumference of the wall 8b of the blank 8.
  • the wall 8 b In order to remove the blank 8 from the mold block 10 or to lift, the wall 8 b must be deflected so far radially outward with the profiling 8e in the removal that the inner edge of the profiling 8 e can be performed on the paragraph 11 over. It makes sense that the dimension of the heel 11 or the profiling 8e is selected such that this deflection remains in the elastic deformation region of the blank 8. For then the wall 8b springs back after the removal back into the shape that was generated by the deformation in the second sub-step.
  • the deflection is not purely elastic, but in addition is accompanied by a plastic deformation.
  • the dimension of the heel 11 and the profiling 8e is to be chosen such that after the reshaping of the elastic portion of the deflection, the profiling 8e still points sufficiently radially inward is trained. That is, in this case, the profiling 8e is further deformed inward by rolling up, as is required for further processing.
  • FIG. 8 is a schematic plan view of a device 16 with the mold from the FIGS. 7a and 7b shown.
  • the apparatus 16 in this example comprises a number of a total of 8 forming stations 17 which are arranged on a circle (indicated by a dashed line) equidistant from one another and rotate about the center of this circle. Of the 8 forming stations 17, only the 3 engaged ones are shown in the figure.
  • Each forming station 17 has a mold block 10 on which a blank 8 can be placed.
  • each forming station 17 has a reel-up 12 which is held by a carrier arm assembly 18.
  • the blank 8 of the device 16 is supplied from the left and placed on the rotating mold block 10. While the device 16 with all associated forming stations 17 rotates counterclockwise, the blank 8 is deformed by the rolling. After a partial rotation of the device 16 by about 180 ° leaves the blank 8 in the illustration of FIG. 8 to the right, the device 16. In the subsequent partial rotation of the mold block 10 is left unused until it is again provided in the illustration on the left with a new blank 8. During the deformation of the occupied with a blank 8 mold block 10 is rotated about its longitudinal axis, which is perpendicular to the plane. As a result, the blank 8 at its entire outer periphery with the profiling invention Mistake. For clarification, a cross section through the blank 8 'is shown in each case before the forming and by the blank 8 "after the deformation in the figure.
  • FIG. 9 finally shows a further device 19 for carrying out the deformation according to the invention in the second partial step.
  • the device has a number of a total of 8 circular, equidistantly arranged mold blocks 10, which rotate about their common center axis in the counterclockwise direction. Furthermore, each mold block 10 additionally rotates about its longitudinal axis which is perpendicular to the plane of the drawing.
  • device 16 is also supplied in the device 19 of the blank 8 from the right side (based on the representation of the drawing) and it is released after a partial rotation of the device 19 by about 180 ° from this.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Table Devices Or Equipment (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Polymerisation Methods In General (AREA)
EP04762740A 2003-09-04 2004-09-02 Verfahren zum herstellen eines napfförmigen gegenstandes Expired - Lifetime EP1663541B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04762740T PL1663541T3 (pl) 2003-09-04 2004-09-02 Sposób wytwarzania miseczkowych przedmiotów

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20320442 2003-09-04
PCT/DE2004/001953 WO2005023451A1 (de) 2003-09-04 2004-09-02 Verfahren zum herstellen eines napfförmigen gegenstandes

Publications (2)

Publication Number Publication Date
EP1663541A1 EP1663541A1 (de) 2006-06-07
EP1663541B1 true EP1663541B1 (de) 2010-05-05

Family

ID=34258792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04762740A Expired - Lifetime EP1663541B1 (de) 2003-09-04 2004-09-02 Verfahren zum herstellen eines napfförmigen gegenstandes

Country Status (7)

Country Link
US (1) US7661286B2 (pl)
EP (1) EP1663541B1 (pl)
AT (1) ATE466677T1 (pl)
DE (2) DE502004011137D1 (pl)
ES (1) ES2343463T3 (pl)
PL (1) PL1663541T3 (pl)
WO (1) WO2005023451A1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023062142A1 (de) 2021-10-14 2023-04-20 Maiko Engineering Gmbh Werkzeug zum umformen von beschichteten blech-rohlingen

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1871551B1 (en) * 2005-04-01 2010-12-22 CROWN Packaging Technology, Inc. Method for the production of metal closures
US10875076B2 (en) 2017-02-07 2020-12-29 Ball Corporation Tapered metal cup and method of forming the same
US11370579B2 (en) 2017-02-07 2022-06-28 Ball Corporation Tapered metal cup and method of forming the same
USD950318S1 (en) 2018-05-24 2022-05-03 Ball Corporation Tapered cup
USD906056S1 (en) 2018-12-05 2020-12-29 Ball Corporation Tapered cup
USD968893S1 (en) 2019-06-24 2022-11-08 Ball Corporation Tapered cup
USD953811S1 (en) 2020-02-14 2022-06-07 Ball Corporation Tapered cup
USD974845S1 (en) 2020-07-15 2023-01-10 Ball Corporation Tapered cup
CA3196939A1 (en) 2020-10-30 2022-05-05 Jonathan A. WHITMORE Tapered cup and method of forming the same
USD1012617S1 (en) 2021-02-22 2024-01-30 Ball Corporation Tapered cup
USD1035386S1 (en) 2021-12-08 2024-07-16 Ball Corporation Tapered cup

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE233036C (pl)
DE433094C (de) 1923-01-07 1926-08-20 Bernardin Bottle Cap Co Verfahren zum Tiefziehen von aus einem Stueck bestehenden Flaschenkapseln
US1671990A (en) * 1927-03-09 1928-06-05 American Metal Cap Co Machine for making caps
US1775738A (en) * 1928-12-07 1930-09-16 Arthur H Parker Machine for forming can covers
US2119662A (en) * 1936-09-03 1938-06-07 Hazel Atlas Glass Co Method of manufacturing container closures
US3015294A (en) * 1955-07-22 1962-01-02 Lyon Inc Method of making wheel covers
DD233036A3 (de) * 1982-11-04 1986-02-19 Fz F Umform U Plastverarbeitun Verfahren und werkzeug zum tiefziehen von blechformteilen
US4567746A (en) * 1984-01-16 1986-02-04 Dayton Reliable Tool & Mfg. Co. Method and apparatus for making shells for cans
DE3704895A1 (de) 1987-02-17 1988-08-25 Rasselstein Ag Verfahren zur herstellung einer tiefziehdose aus blech
JP2825138B2 (ja) * 1991-03-12 1998-11-18 トヨタ自動車株式会社 曲げ加工型
JP2513379B2 (ja) 1991-10-02 1996-07-03 東洋製罐株式会社 有機被覆金属材の絞り成形法
DE19581564B3 (de) * 1995-01-27 2004-06-03 Kanemitsu Corp., Akashi Verfahren zum Herstellen einer Mehrfach-Keilriemenscheibe aus Blech
US5740609A (en) * 1995-12-08 1998-04-21 Motor Wheel Corporation Method of making one-piece vehicle wheels and the like
US6038910A (en) * 1998-12-30 2000-03-21 Can Industry Products, Inc. Method and apparatus for forming tapered metal container bodies

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023062142A1 (de) 2021-10-14 2023-04-20 Maiko Engineering Gmbh Werkzeug zum umformen von beschichteten blech-rohlingen
DE102021126646A1 (de) 2021-10-14 2023-04-20 MAIKO Engineering Gesellschaft mit beschränkter Haftung Werkzeug zum Umformen von beschichteten Blech-Rohlingen

Also Published As

Publication number Publication date
WO2005023451A1 (de) 2005-03-17
DE502004011137D1 (de) 2010-06-17
ES2343463T3 (es) 2010-08-02
US20060283228A1 (en) 2006-12-21
EP1663541A1 (de) 2006-06-07
DE112004002141D2 (de) 2006-07-13
ATE466677T1 (de) 2010-05-15
PL1663541T3 (pl) 2010-09-30
US7661286B2 (en) 2010-02-16

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