EP0675773B1 - Verfahren und Vorrichtung zur Weiterbehandlung eines Verschlussdeckels aus Blech - Google Patents

Verfahren und Vorrichtung zur Weiterbehandlung eines Verschlussdeckels aus Blech Download PDF

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Publication number
EP0675773B1
EP0675773B1 EP93921809A EP93921809A EP0675773B1 EP 0675773 B1 EP0675773 B1 EP 0675773B1 EP 93921809 A EP93921809 A EP 93921809A EP 93921809 A EP93921809 A EP 93921809A EP 0675773 B1 EP0675773 B1 EP 0675773B1
Authority
EP
European Patent Office
Prior art keywords
curvature
radius
sheet
panel portion
central panel
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
EP93921809A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0675773A1 (de
Inventor
Lutz Strube
Peter Höft
Dieter Heinecke
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.)
Ardagh Metal Packaging Germany GmbH
Original Assignee
Schmalback Lubeca AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schmalback Lubeca AG filed Critical Schmalback Lubeca AG
Publication of EP0675773A1 publication Critical patent/EP0675773A1/de
Application granted granted Critical
Publication of EP0675773B1 publication Critical patent/EP0675773B1/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

Definitions

  • the invention relates to a method for the further treatment of a closure lid made of sheet metal, in particular a folding lid for beverage cans or the like, with the features of the preamble of claim 1 and claim 2.
  • the tool for carrying out the method is also affected.
  • Such a cover is known from US Pat. No. 3,441,170, in which the radius of curvature is reduced in thickness even from the inside of the cover, with the formation of a “coined bead”.
  • a kind of joint is created between the inner leg of the groove and the cover mirror in order to restrict the bulging of the cover to the cover mirror, so that the tensile forces acting radially inward on the core wall of the cover are reduced.
  • the lid mirror which bulges more strongly under greater internal pressure, is articulated to the core wall in such a way that the latter is not or only slightly touched in its vertical orientation by the bulging.
  • EP 88 968 A1 A similar measure is known from EP 88 968 A1, in which the cover plate is deformed from the outside by pressing pressure starting from the radially inner edge of the radius of curvature over a region of the radius of curvature, so that material of the cover is radially inward and outward from this radius of curvature region flows outside.
  • the deformation area forms a flat on the outside of the radius of curvature, the major part of the flat coming to lie in a plane perpendicular to the axis of the cover or in a conical plane inclined outwards and downwards. This also improves the resistance of the cover to bulging.
  • the embossing surface of the lower embossing tool or stamp is preferably parallel to this plane running perpendicular to the lid axis, that is to say that the angle mentioned is also present between the two embossing surfaces.
  • This angle should be significantly larger than 0 ° be, but in any case less than 90 °.
  • This angle is preferably between 2 ° and 15 °.
  • Lids reshaped in this way are stable in their overhead stability even with increased internal pressure, although they do not have to miss the advantage of the more precise vertical alignment of the inner leg.
  • a ring holder with a cross section which is finger-shaped can be centered in the U-shaped groove during the embossing process, without exerting forces which have an effect on the core groove.
  • the material of the cover plate is pressed together in the region of the annular strip in such a way that in this annular strip region the reduction in plate thickness decreases steadily in the direction radially outward from a point of smallest residual thickness.
  • the remaining thickness changes radially outward, for example in the form of a straight wedge, the underside lying in a plane perpendicular to the lid axis and the top in a straight conical surface.
  • a second treatment step follows the first treatment step described.
  • the lid material is - in the first Crushed and deformed step - strip-shaped area slightly leveled, but without making any noticeable material displacement, but only in a partial area, namely a radially outer area of the strip adjacent to the radius of curvature. This leads to a further reduction in the radius of curvature , which contributes significantly to increasing the nose strength of the lid. If, due to the first embossing, an insignificant part of the displaced material has been shifted radially inwards, the second treatment step may plan this.
  • the leveling step therefore does purely geometric design work, which relates to the improved alignment of the inner leg of the core groove.
  • US-A-4,354,784 (Westphal), which introduces a chip-free score line into a metallic cover, deals with an objective which differs from the invention.
  • This score line runs all the way around the vertical core wall of the cover and is introduced by a tool that has a central flat area and two inclined outer areas (column 4, first paragraph). With this "trapezoidal tool" a notch line contour is obtained, which reduces the risk of metal chips when torn open. This freedom from chips is obtained by defining the score line by simultaneously displacing material from the central area to both sides (radially inside and radially outside). This tool does not cause material to be displaced only on one side.
  • an S-shaped triple protective fold is proposed, which is also circumferential and is obtained by folding an initially vertical wall section.
  • a tool part is used (recognizable there with the aid of FIG. 14), which has an annular undercut and a projecting flat annular surface, which in one zone (designated 45) reduces the material thickness of the metal cover.
  • the lid 1 is shaped, as usual, from a sheet metal blank so that it has a slightly curved central lid mirror 10, which over a radius of curvature 11, R1 merges into the straight inner leg 13 of a cross-sectionally U-shaped groove 12, the outer leg 14 of which Forms the core wall of the lid, to which (not shown) the lid edge connects.
  • the edge can be of any design and typically be a folded edge.
  • the lid preformed in this way is placed between the embossing tools 2 and 4.
  • the embossing tool 2 has an embossing surface 3 running approximately perpendicular to the lid axis 16.
  • the embossing tool 4, which can be moved relative to the embossing tool 2 in accordance with the arrow 15, has on its underside in the outer area an annular rib formed by a step 5, the effective bottom 6 of which forms a predetermined angle 25 with respect to the embossing surface 3 of the tool 2, which is noticeably greater than 0 ° and less than 90 ° and preferably approximately between 2 ° and 15 ° lies.
  • the embossing tool 4, 5 is supported on a stamp 7, on which, in the example shown, a ring-shaped hold-down device 8 is supported via a spring 9, which is finger-shaped in cross section and engages centering in the U-shaped groove 12 of the cover.
  • Figure 1 shows the embossing tools in a position which they assume at the end of the squeezing or embossing process.
  • the material of the cover mirror 10 of the sheet metal cover is squeezed in an annular strip region 20, which adjoins the R1 curve 11 radially on the inside.
  • the curvature 11 itself is largely spared from the squeezing process, but not from its effects with regard to the material moved outwards.
  • the material displaced during the squeezing flows in a controlled manner radially outward and via the curvature 11 into the inner leg 13 of the groove 12 to be aligned.
  • the smallest remaining thickness which is indicated at 28 in the tool position according to FIG .
  • it can be 65%.
  • the reduction in thickness decreases in the radial direction towards the outside, preferably along 22 evenly and steadily, so that radially outside the remaining thickness 29 merges into the normal thickness of the sheet in the region of the curvature 11 essentially without steps.
  • the flow process is further favored if the holding-down device 8 is rigidly supported on the punch 7 via the part 8a, the axial length 27 of the centering finger 8 being dimensioned such that at the end of the embossing process, a predetermined pressure is exerted on the bottom 12 of the finger Nut is exercised.
  • the flow of material from the strip area 20 is still significantly favored by the curvature 11, and at the same time the radially inner straight leg 13 of the U-shaped groove 12 is held and aligned under tensile stress.
  • the resistance to deformation of the edge profile can be significantly increased and the nose strength increased if the treatment step (stamping) according to FIG . 1 or 3 described above is followed by a treatment step (leveling) according to FIG. 4 .
  • Tools similar to those used in the first treatment step are used here, but the upper die 31 has an embossing rib, the effective leveling surface of which runs essentially perpendicular to the cover axis 16, so that during leveling the material is geometrically shaped between two planes and the embossing surfaces running perpendicular to the cover axis 16 becomes.
  • the embossing tool 31 is supported on the punch 30, on which the centering tool 34, which is finger-shaped in cross section, can also be supported directly via part 33, as shown in FIG. 4 .
  • the stretching effect of the tool 34 is the same as the effect of the tool 8 according to FIG. 3.
  • the radius R2 of the curvature 11 is reduced compared to the radius R1 according to FIG. 2.
  • the reduction in the radius of curvature and the geometrical reforming of the squeezing area lead to an increase in the nose strength through clean contouring of the edge profile without additional material hardening.
  • the remaining part of the strip 24 maintains its inclination in accordance with the angle 25 from the first stamping.
  • the centering during the second step according to FIG. 5 can take place according to FIG. 1 , that is to say with a spring-loaded centering tool.
  • a centering tool according to FIG. 4 is preferred , with which the leg 13 of the U-shaped groove 12 can be placed under yield stress.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Closures For Containers (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Forging (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Threshing Machine Elements (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Making Paper Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP93921809A 1993-10-08 1993-10-08 Verfahren und Vorrichtung zur Weiterbehandlung eines Verschlussdeckels aus Blech Expired - Lifetime EP0675773B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1993/000958 WO1995010373A1 (de) 1993-10-08 1993-10-08 Verfahren zur weiterbehandlung eines blechverschlussdeckels

Publications (2)

Publication Number Publication Date
EP0675773A1 EP0675773A1 (de) 1995-10-11
EP0675773B1 true EP0675773B1 (de) 1995-10-18

Family

ID=6888535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93921809A Expired - Lifetime EP0675773B1 (de) 1993-10-08 1993-10-08 Verfahren und Vorrichtung zur Weiterbehandlung eines Verschlussdeckels aus Blech

Country Status (16)

Country Link
US (1) US5832770A (no)
EP (1) EP0675773B1 (no)
JP (1) JPH09503443A (no)
KR (1) KR100274401B1 (no)
AT (1) ATE129173T1 (no)
AU (1) AU686571B2 (no)
BG (1) BG62278B1 (no)
DE (1) DE59300795D1 (no)
DK (1) DK0675773T3 (no)
ES (1) ES2082660T3 (no)
FI (1) FI961527A (no)
GR (1) GR3018362T3 (no)
NO (1) NO312018B1 (no)
RU (1) RU2111820C1 (no)
WO (1) WO1995010373A1 (no)
ZA (1) ZA947798B (no)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5987956A (en) * 1995-05-17 1999-11-23 Schmalbach-Lubeca Ag Process for further treating a closure end made of sheet
WO1995010373A1 (de) * 1993-10-08 1995-04-20 Schmalbach-Lubeca Ag Verfahren zur weiterbehandlung eines blechverschlussdeckels
US5931663A (en) * 1997-02-27 1999-08-03 Process Combustion Corporation Purge system for regenerative thermal oxidizer
AU4129999A (en) * 1998-03-23 1999-10-18 Schmalbach-Lubeca Ag Slightly inclined surface area in a sheet-metal closing lid
DE19833492A1 (de) * 1998-03-23 1999-09-30 Schmalbach Lubeca Verschlußdeckel aus Blech mit abgesenktem Öffnungsbereich
US8141406B2 (en) * 2008-10-09 2012-03-27 Container Development, Ltd. Method and apparatus for forming a can shell
DE102009035680A1 (de) * 2009-07-30 2011-03-17 Alcan Technology & Management Ag Vorrichtung zum Formen von tiefgezogenen Behältern
CN108115048B (zh) * 2017-12-18 2019-05-14 中国航发贵州黎阳航空动力有限公司 一种环形钣金零件径向槽口轴向精确翻边方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2154983A (en) * 1937-02-15 1939-04-18 Kelsey Hayes Wheel Co Metalworking machine
US3441170A (en) * 1967-03-03 1969-04-29 Continental Can Co Coined bead for improved fill characteristics
US3591037A (en) * 1969-02-24 1971-07-06 Aluminum Co Of America Container with removable panel portion
US3576272A (en) * 1969-06-30 1971-04-27 Procter & Gamble Score-line structure
US3871314A (en) * 1972-10-20 1975-03-18 Dorn Co V Method of making folded can ends and folded can end product
US3946683A (en) * 1972-12-26 1976-03-30 Aluminum Company Of America Tabless container opening device and method and tools for forming the same
US4122791A (en) * 1977-06-30 1978-10-31 Dayton Reliable Tool & Manufacturing Company Method and apparatus for scoring an enameled metal surface
US4354784A (en) * 1979-08-27 1982-10-19 Boise Cascade Corporation Method and apparatus for forming a non-silver scored metal end
US4579495A (en) * 1982-01-08 1986-04-01 American Can Company Environmental retained tab ends
US4577774A (en) * 1982-03-11 1986-03-25 Ball Corporation Buckle resistance for metal container closures
USRE33217E (en) * 1982-03-11 1990-05-15 Ball Corporation Buckle resistance for metal container closures
US4434641A (en) * 1982-03-11 1984-03-06 Ball Corporation Buckle resistance for metal container closures
US4735863A (en) * 1984-01-16 1988-04-05 Dayton Reliable Tool & Mfg. Co. Shell for can
US4832223A (en) * 1987-07-20 1989-05-23 Ball Corporation Container closure with increased strength
US5219257A (en) * 1990-11-21 1993-06-15 Koch Systems Incorporated Self-opening can lid with improved contour of score and means for making
US5356256A (en) * 1992-10-02 1994-10-18 Turner Timothy L Reformed container end
WO1995010373A1 (de) * 1993-10-08 1995-04-20 Schmalbach-Lubeca Ag Verfahren zur weiterbehandlung eines blechverschlussdeckels

Also Published As

Publication number Publication date
ES2082660T3 (es) 1996-03-16
NO961358D0 (no) 1996-04-02
ZA947798B (en) 1995-08-21
EP0675773A1 (de) 1995-10-11
AU686571B2 (en) 1998-02-12
RU2111820C1 (ru) 1998-05-27
AU5106693A (en) 1995-05-04
DK0675773T3 (da) 1996-02-19
FI961527A0 (fi) 1996-04-04
NO961358L (no) 1996-04-19
DE59300795D1 (de) 1995-12-21
GR3018362T3 (en) 1996-03-31
BG62278B1 (bg) 1999-07-30
NO312018B1 (no) 2002-03-04
WO1995010373A1 (de) 1995-04-20
FI961527A (fi) 1996-04-04
BG100481A (en) 1997-07-31
JPH09503443A (ja) 1997-04-08
KR100274401B1 (ko) 2000-12-15
ATE129173T1 (de) 1995-11-15
US5832770A (en) 1998-11-10

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