EP1109635B1 - Process for the production of can bodies and of filled and closed cans - Google Patents
Process for the production of can bodies and of filled and closed cans Download PDFInfo
- Publication number
- EP1109635B1 EP1109635B1 EP99947278A EP99947278A EP1109635B1 EP 1109635 B1 EP1109635 B1 EP 1109635B1 EP 99947278 A EP99947278 A EP 99947278A EP 99947278 A EP99947278 A EP 99947278A EP 1109635 B1 EP1109635 B1 EP 1109635B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- blank
- centre section
- sheet material
- bodies
- 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
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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
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
Definitions
- the invention relates firstly to a process for producing can bodies from substantially metal blanks, which process comprises the operation of punching discs out of sheet material and the production of can bodies by deep drawing and/or wall ironing, each can body comprising a can wall and a can base (see JP-A-07232230).
- blanks are generally understood to mean the preforms from which can bodies are produced by deep drawing and/or wall ironing.
- the invention also relates to a process for producing filled and closed cans.
- Large numbers of cans of this nature are used for the packaging of drinks and foodstuffs, but also of other materials.
- a generally customary process consists in round discs being punched out of a sheet-metal material, which discs can be used as blanks. This production of blanks may take place at the can-maker's factory, but also at the steel manufacturer's factory, in which case the manufacturer can immediately reuse the return scrap.
- the processing of flat blanks of this nature involves one or more deep-drawing operations, optionally followed by a so-called wall-ironing operation.
- wall-ironing operation During deep drawing, the wall thickness of the can formed, or the intermediate forms thereof, remains essentially unchanged.
- wall ironing however, the wall material becomes much thinner, resulting in a considerable saving of material.
- the base of the can to a large extent retains the original sheet thickness, or slightly less, if the base is subsequently also profiled.
- Such profiling may, for example, consist in pressing a so-called core into the base in order to provide the base with a somewhat greater dimensional stability. Nevertheless, the base is still only slightly thinner than the original thickness of the sheet material used. Likewise, the mechanical properties of the base are substantially determined by those of the starting material.
- the choice of the starting material is essentially determined by the requirements which the deep drawing and/or the wall ironing of the can wall impose on this material; consequently, it is impossible to use a more rigid and harder starting material, which could lead to a thinner base.
- the object of the invention is to provide a process in which it is nevertheless possible to save considerable amounts of material in the blank, and therefore also in the can body.
- the invention consists in the process for producing can bodies as described in the preamble, in which the sheet material is biaxially stretched at the location of the centre section of the blank which is to be formed, while an area of the blank which is to be formed, outside the centre section, is held clamped in place.
- the biaxial stretching of the centre sections of the blanks which are to be formed may take place before discs are stamped out of the sheet material.
- the sheet has to be clamped locally in place at every position from which a disc is stamped out and has to be stretched within each clamping rim.
- the blanks can then be stamped out of the sheet.
- Metal can bodies for beverage cans are usually produced from aluminium or steel.
- the novel process can also be applied to aluminium sheet material, it has been found that it is preferable to use the process on steel-based sheet material. This is because it has been found that in this case more substantial deformation of the base material is possible, leading to a greater saving of material.
- the biaxial stretching of the centre section of the blank to be formed may be carried out in various ways. For example, it is conceivable to employ the generally known technique of hydroforming for this purpose, or alternatively the technique of spinning using a spinning roll. However, both methods have been found to be extremely time-consuming. Therefore, preference is given to a method according to the invention in which the biaxial stretching is carried out by pressing a punch with a convexly shaped head against the centre section of the blank which is to be formed.
- the shape of the convexly shaped head may be adapted to the desired distribution of the strengthening over the surface of the blank. Generally, however, the surface of this head will be approximately in the shape of a segment of a sphere.
- the biaxially stretched centre section will correspond to at least the can base which is to be formed from the blank. Making the whole of this can base thinner saves additional material. In particular, however, it is preferable for the biaxially stretched centre section also to comprise that part of the blank from which a conical transition piece from the can base to the can wall is formed. It should be noted that a conical transition piece of this nature is in very widespread use for beverage cans.
- the sheet material which is coated. If the sheet material is steel-based, it has been found that good results are obtained if the starting material is steel sheet which is metallically coated on two sides with one of the materials selected from the group consisting of tin and chromium-chromium oxide, and which is furthermore coated on two sides with at least one layer of plastic selected from the group consisting of PET, polypropylene and copolymers thereof.
- n-value also known as the "strain-hardening exponent"
- the invention furthermore relates to a process for producing filled or closed cans.
- a process for producing filled or closed cans By starting from material which has been coated with plastic on two sides, it has proven possible not only to form can bodies from the coated blanks, but also subsequently to fill these can bodies and to seal them with a lid in a known way. This makes it possible to provide a so-called "form-fill-seam" line for beverage cans. This saves the costs of transporting empty cans.
- the invention also relates to the metal can body itself, comprising a can wall and a can base.
- This novel can body is characterized in that the can base is made from work-hardened material with a thickness of between 2.5 and 2.75 x the wall thickness of the can wall.
- This thickness ratio is significantly lower than in known beverage cans, in which this ratio is generally between 2.8 and 3.2. Preference is in this case given to a thickness ratio of the base and the wall of between 2.55 and 2.66. This provides a good compromise between, on the one hand, demands which are imposed on the material and, on the other hand, the possibility of saving material.
- a steel can body as described above should preferably have a can base in which the material exhibits a tensile stress, at 0.2% elongation, of 620 ⁇ 70 N/mm 2 and a hardness R 30 C of 76 ⁇ 3 N/mm 2 .
- Fig. 1 illustrates the biaxial stretching of a centre section of a disc.
- Fig. 2 shows the further processing of the blank obtained in this way.
- reference numeral 1 denotes a disc of steel sheet, a wide periphery of which is clamped between an upper clamping ring 2 and a lower clamping ring 3, and is held between these clamping rings 2,3.
- a convex punch 4 is pressed against the centre section of disc 1; the left-hand side of the figure shows the position of convex punch 4 prior to deformation of the disc 1, while the right-hand part of the figure shows its position at the end of the biaxial stretching of the disc. In this position, the centre section of the disc has bulged outwards into the shape 5.
- a disc diameter of 125 mm and a disc thickness of 0.22 mm are used.
- the starting material was tin-plated steel sheet with a yield stress of 283 N/mm 2 , a tensile strength of 385 N/mm 2 , an r-value of 1.21 and an n-value of 0.16.
- the material becomes thinner and harder in the centre section of disc 1, which will ultimately form the base of the can which is to be formed.
- Fig. 2 shows the blank 5, formed as shown in Figure 1, located in a following processing device.
- the edge of the blank 5 is located between a drawing die 6 and a blank-holder ring 7 of a deep-drawing press.
- the left-hand half of Figure 2 shows the position of a punch 8 at the beginning of deep-drawing, while the right-hand half of the figure shows a position virtually at the end of this deep-drawing operation.
- the edge of the disc is held in place, during the deep-drawing operation the edge is drawn out between the drawing die 6 and the blank-holder ring 7.
- the punch 8 shown is approximately conical in the vicinity of its end, making it possible to form the conical transition 11 to the base 10 which is customary in many beverage cans. Due to the convex shape 5 of the blank, the material now matches the shape of the punch better, thus preventing chime wrinkling.
- Fig. 2 also shows a wall-ironing ring 9.
- the cup formed by deep-drawing can be shaped further into a can body by wall ironing.
Abstract
Description
Claims (14)
- Process for producing can bodies from metal blanks (5), which process comprises the operation of punching discs (1) out of sheet material and the production of can bodies by deep drawing and/or wall ironing, each can body comprising a can wall and a can base, characterized in that the sheet material is biaxially stretched at the location of the centre section of the blank which is to be formed, while an area of the blank which is to be formed, outside the centre section, is held clamped in place.
- Process according to Claim 1, characterized in that the discs (1) are stamped out of the sheet material prior to the biaxial stretching of the centre section of the blank.
- Process according to Claim 1 or 2, characterized in that steel-based sheet is used as the starting material.
- Process according to Claim 1, 2 or 3, characterized in that the sheet material is metallically coated and/or coated with a plastic.
- Process according to one of Claims 1-4, characterized in that the biaxial stretching is carried out by pressing a punch (4) with a convexly shaped head against the centre section of the blank which is to be formed.
- Process according to one of Claims 1-5, characterized in that the biaxially stretched centre section corresponds to at least the can base which is to be formed from the blank.
- Process according to Claim 6, characterized in that the biaxially stretched centre section comprises also that part of the blank from which a conical transition part from the can base to the can wall is formed.
- Process according to Claim 3 or one of Claims 4-7 in combination with Claim 3, characterized in that biaxial stretching is carried out to an extent which results in a thickness reduction of between 20 and 30% on the average.
- Process according to Claim 8, characterized in that the thickness reduction is uniformly distributed within a range from 23 to 27%.
- Process according to one of Claims 5 to 9, characterized in that the starting material is steel sheet which is metallically coated on two sides with one of the materials selected from the group comprising tin and chromium-chromium oxide, and which is furthermore coated on two sides with at least one layer of plastic selected from the group comprising PET, polypropylene and copolymers thereof.
- Process according to one of Claim 1 to 10, characterized in that the sheet material used has an n-value of at least 0.16.
- Process according to one of the preceding Claims, characterized in that the can body is produced from the biaxially stretched blank using a single deep-drawing step, followed by at least one wall-ironing operation.
- Process according to one of the preceding Claims, characterized in that the biaxial stretching of sheet material, and the forming of can bodies therefrom, are carried out in line in successive processing steps.
- Process for producing filled and closed cans, characterized in that can bodies are formed using the process of Claim 10, in combination with Claim 12 or 13, after which the can are filled and are sealed in a known way using a lid.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1010009 | 1998-09-04 | ||
NL1010009A NL1010009C2 (en) | 1998-09-04 | 1998-09-04 | Method for the production of mainly metal blanks, of bus bodies from such blanks, of filled and closed buses from such bus bodies, and a metal bus body. |
PCT/EP1999/006544 WO2000013815A1 (en) | 1998-09-04 | 1999-09-03 | Process for the production of can bodies, of filled and closed cans from can bodies of this nature, as well as a metal can body |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1109635A1 EP1109635A1 (en) | 2001-06-27 |
EP1109635B1 true EP1109635B1 (en) | 2002-11-27 |
Family
ID=19767753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99947278A Expired - Lifetime EP1109635B1 (en) | 1998-09-04 | 1999-09-03 | Process for the production of can bodies and of filled and closed cans |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1109635B1 (en) |
AT (1) | ATE228406T1 (en) |
AU (1) | AU758510B2 (en) |
BR (1) | BR9913458A (en) |
DE (1) | DE69904207T2 (en) |
ES (1) | ES2188245T3 (en) |
NL (1) | NL1010009C2 (en) |
TR (1) | TR200100711T2 (en) |
WO (1) | WO2000013815A1 (en) |
ZA (1) | ZA200101669B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013114007A1 (en) | 2013-12-13 | 2015-06-18 | Ball Europe Gmbh | Process for the pretreatment of a can body made from a metal sheet |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2426319B1 (en) | 2012-04-19 | 2014-09-02 | Expal Systems, S.A. | PROCESS AND CONFORMING SYSTEM OF A METAL SHEET |
DE102020129484A1 (en) | 2020-11-09 | 2022-05-12 | Ardagh Metal Beverage Europe Gmbh | Method of manufacturing a metallic container |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE964138C (en) * | 1954-06-12 | 1957-05-16 | Bosch Gmbh Robert | Process and punch for deep drawing sheet metal |
US2989019A (en) * | 1957-05-20 | 1961-06-20 | Budd Co | Method of deep drawing sheet material |
GB900651A (en) * | 1957-06-01 | 1962-07-11 | Production Engineering Res Ass | Improvements in and relating to deep drawing of metals |
US3564895A (en) * | 1968-10-18 | 1971-02-23 | Fairchild Hiller Corp | Drawing apparatus and method |
DE8712526U1 (en) * | 1987-09-16 | 1987-10-29 | Siegwart, Emil, 6605 Friedrichsthal, De | |
JPH07106394B2 (en) * | 1989-05-17 | 1995-11-15 | 東洋製罐株式会社 | Squeeze ironing can manufacturing method |
WO1994016842A1 (en) * | 1993-01-29 | 1994-08-04 | Mn Maschinenbau & Engineering Martin Nussbaum | Process and installation for producing aluminium cans for beverages or foodstuffs |
US5394727A (en) * | 1993-08-18 | 1995-03-07 | Aluminum Company Of America | Method of forming a metal container body |
JPH07232230A (en) * | 1994-02-24 | 1995-09-05 | Nippon Steel Corp | Manufacture of thin-walled di can |
-
1998
- 1998-09-04 NL NL1010009A patent/NL1010009C2/en not_active IP Right Cessation
-
1999
- 1999-09-03 DE DE69904207T patent/DE69904207T2/en not_active Expired - Fee Related
- 1999-09-03 BR BR9913458-6A patent/BR9913458A/en not_active IP Right Cessation
- 1999-09-03 ES ES99947278T patent/ES2188245T3/en not_active Expired - Lifetime
- 1999-09-03 EP EP99947278A patent/EP1109635B1/en not_active Expired - Lifetime
- 1999-09-03 WO PCT/EP1999/006544 patent/WO2000013815A1/en active IP Right Grant
- 1999-09-03 AT AT99947278T patent/ATE228406T1/en not_active IP Right Cessation
- 1999-09-03 TR TR2001/00711T patent/TR200100711T2/en unknown
- 1999-09-03 AU AU60800/99A patent/AU758510B2/en not_active Ceased
-
2001
- 2001-02-28 ZA ZA200101669A patent/ZA200101669B/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013114007A1 (en) | 2013-12-13 | 2015-06-18 | Ball Europe Gmbh | Process for the pretreatment of a can body made from a metal sheet |
Also Published As
Publication number | Publication date |
---|---|
TR200100711T2 (en) | 2001-07-23 |
EP1109635A1 (en) | 2001-06-27 |
AU6080099A (en) | 2000-03-27 |
WO2000013815A1 (en) | 2000-03-16 |
NL1010009C2 (en) | 2000-03-07 |
ES2188245T3 (en) | 2003-06-16 |
DE69904207D1 (en) | 2003-01-09 |
ATE228406T1 (en) | 2002-12-15 |
AU758510B2 (en) | 2003-03-20 |
ZA200101669B (en) | 2001-08-31 |
BR9913458A (en) | 2001-07-24 |
DE69904207T2 (en) | 2003-08-14 |
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