EP0524098A1 - Verfahren und Stempel für das Tiefziehen von Behältern mit regelmässiger Wandung - Google Patents

Verfahren und Stempel für das Tiefziehen von Behältern mit regelmässiger Wandung Download PDF

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Publication number
EP0524098A1
EP0524098A1 EP92402056A EP92402056A EP0524098A1 EP 0524098 A1 EP0524098 A1 EP 0524098A1 EP 92402056 A EP92402056 A EP 92402056A EP 92402056 A EP92402056 A EP 92402056A EP 0524098 A1 EP0524098 A1 EP 0524098A1
Authority
EP
European Patent Office
Prior art keywords
radius
punch
connection
stamping
coefficient
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.)
Granted
Application number
EP92402056A
Other languages
English (en)
French (fr)
Other versions
EP0524098B1 (de
Inventor
Gérard Heurteboust
André Leplomb
Jean-François Seconde
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0524098A1 publication Critical patent/EP0524098A1/de
Application granted granted Critical
Publication of EP0524098B1 publication Critical patent/EP0524098B1/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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing

Definitions

  • the present invention relates to a method of stamping blanks for the manufacture of containers which may have a flange corresponding to the non-stamped part of the blank.
  • the blanks are generally made of a metal which has undergone a drawing or rolling operation so that this metal has an anisotropy as regards the resistance to thinning.
  • the irregularity In the case of a stamped without collar, the irregularity is located at the end of the wall. This irregularity creates significant obstacles during subsequent operations (case of re-stamping or ironing).
  • a minimum reserve is generally used under a blank holder, that is to say that one works at the minimum blank holder pressure, at the limit of the appearance of folds. on the collar.
  • the stamping operation swallows a larger quantity of metal into the matrix and in order to always obtain the same dimension of flange, it is necessary to increase the dimensions of the starting blank.
  • the present invention therefore proposes to provide a method which makes it possible to reduce the formation effect. horns without increasing the amount of material used.
  • the subject of the invention is a method for stamping blanks of flat metal products which have undergone a drawing or rolling operation, with a view to carrying out subsequent operations of deep drawing or ironing or with a view to manufacturing flanged containers from particular of cylindrical containers, characterized in that a punch is used whose nose has a variable connection radius which is determined according to the anisotropic characteristics of the blank material.
  • the punch therefore has a variable or evolving connection radius which is determined so as to compensate for the anisotropic nature of the material used.
  • the connection radius is determined as a function of the resistance to thinning of the material considered or LANDFORD coefficient. It is thus possible to determine for each base material and each container to be produced the ideal profile of the punch nose which makes it possible to obtain a practically regular flange.
  • This rectification operation makes the shape of the bottom of the container obtained more regular.
  • this rectification operation is only carried out in certain areas of the bottom of the container. This is done in particular in the case where the difference between the minimum and maximum radii of connection of the stamping punch is significant.
  • This grinding operation can be used to create bosses in the bottom of the container ; advantageously these bosses are four in number. They serve as a support zone for the container obtained, the bottom of which is not in contact with its support. This avoids damaging, for example by scratching, an illustration carried by the outer wall of the bottom of the container.
  • the invention also relates to a stamping machine punch for the implementation of the aforementioned method, characterized in that its nose has a variable connection radius; advantageously, the nose of the punch has four zones distributed at right angles, having a maximum connection radius and separated by zones with minimum connection radius.
  • the maximum radius of connection of the nose of the punch is equal to five times its minimum radius.
  • Figure 1 shows an exploded perspective view of the container obtained by a stamping process of known type using a punch whose nose has a constant radius of connection; in the example shown which relates to the manufacture of metal cups from thin iron blanks of 0.18 mm thick which has undergone a significant skin-pass operation, the connection radius of the nose of the punch is 2 mm for a cup with a diameter of 65 mm and a height of 45 mm.
  • the collar 1 has an irregular shape and has horns 2 separated by horn recesses 3.
  • the radius of connection of the punch nose is found at the bottom of the container and the radius of connection of this bottom 4 with wall 5, R1 or R2, is constant and equal to 2 mm.
  • the associated curve 4 represents the thickness of the wall of the container at different points designated A, B, C, D and E; the curve in solid line corresponds to a direction of formation of hollow of horn and the curve in broken line to a direction corresponding to the formation of horns.
  • the horn formation directions correspond to a LANDFORD coefficient high and the troughs of horn formation at a low LANDFORD coefficient.
  • Figures 2 and 5 correspond to Figures 1 and 4 and show the product obtained in a rolling radius drawing process according to the invention. It can be seen that the collar 11 is very regular and that there is no longer any horn or hollow of the horn. Furthermore, it appears from FIG. 5 that the distribution of the thickness of the wall is much more regular than in the stamping method of known type, the thickness differences between the directions with low LANDFORD coefficient and the directions with a high LANDFORD coefficient are more reduced.
  • the profile of the cup obtained corresponds to the profile of the punch used.
  • the radius R11 of connection in a zone normally corresponding to a formation of recess, that is to say to a coefficient of low LANDFORD is of small value for example 1 mm while the radius of connection R12 corresponding to a direction of horn formation, i.e. at a high LANDFORD coefficient, is higher, for example 5 mm. It can be seen that the modulation of the radius of connection of the nose of the punch as a function of the LANDFORD coefficient makes it possible to eliminate the formation of horns and hollows while using the same starting blank, that is to say the same amount of material. In addition, a normal hold down pressure is used.
  • Figures 3 and 6 correspond to the case where the stamping method according to the invention was used by carrying out an additional operation of rectification of the bottom of the container using a punch with a regular profile.
  • This treatment practically only concerns the bottom of the container, without stretching the wall.
  • the shape of the collar 21 remains unchanged, but the large connecting radii are "caught up" corresponding to a high LANDFORD coefficient (formation of horns).
  • the radius R12 in FIG. 2 is reduced from 5 mm to a value R22 of 2 mm, the radius R21 corresponding to the low LANDFORD coefficient remaining unchanged.
  • This rectification operation cannot generally be pushed until a regular profile is obtained for the bottom of the box when materials having a significant anisotropy are used such as steels having undergone a significant skin-pass operation.
  • This rectification operation is carried out so as to create slight bosses 26 projecting from the bottom of the container in the rectified zones; these bosses, which are four in number, constitute bearing surfaces of the container on its support, which makes it possible to preserve the external face of the bottom from contact with its support. In this way, it is possible to avoid degradation, for example by scratching, of a decorative motif affixed or produced on the external face of the base 24.
  • Figures 7 to 9 are curves representative of the thickness of the wall of the container obtained according to a known type process (solid lines curves) and according to a process according to the present invention (dashed lines) in a perpendicular direction in the direction of rolling (Figure 7), parallel to the direction of rolling ( Figure 8) and in a 45 ° direction relative to the first two ( Figure 9).
  • the curve in solid lines corresponds to a connection radius equal to 2 mm and the curve in broken lines to a radius of 1 mm, that is to say according to a direction where the LANDFORD coefficient is high;
  • FIG. 8 corresponds to the same conditions and in these two cases, the connection radius for the known type stamping process (curves in solid line) is 2 mm and the connection radius for the known type process (curves in broken line) is 1 mm.
  • FIG. 9 corresponds to the oblique directions which form an angle of 45 ° with respect to the rolling direction and which are not preferred orientations such as the regions perpendicular or parallel to the rolling direction ( Figures 6 and 7).
  • the radius of connection of the curve in solid lines is 2 mm and the radius of connection of the curve in broken lines corresponds to radius R11 of FIG. 2 and is equal to 5 mm.
  • the method according to the invention makes it possible to obtain a better circumferential distribution of the thickness, the coefficient ⁇ passing from the value 0.025 for the known method to the value 0.006 for the method according to the invention, and a greater stretch over the height of the box, the coefficient ⁇ ⁇ passing from the value 0.995 to the value 0.978 for the method according to the invention.
  • FIG. 10 partially shows in perspective a stamping machine punch intended for implementing the method which has just been described.
  • This punch 41 the working face of which has essentially been represented, has a connection nose 42 with an evolving connection radius. It has four zones 43 where the connection radius is high. These zones 43 correspond to directions making an angle of 45 ° with the rolling axis 44 and the transverse axis 45; the zones corresponding to the axial direction 44 and the transverse direction 45 are zones where the radius of connection is minimal.
  • the minimum radius is for example 1 mm and the maximum radius 5 mm.
  • the Applicant has manufactured metal cups having the dimensions indicated above in thin iron blanks 0.18 mm thick having undergone a significant skin-pass operation. She found that you get a 20% gain on the surface additional residual of the collar, a gain of 5% on the hollow diameter of the horn which can result in a reduction of more than 3% of the surface of the initial blank. In addition, it was possible to reduce the holding forces under blank holder by 50%.
  • the amplitude of the horns was reduced by 42% on the collar. This is particularly important in the case where cups having patterns are produced from preprinted blanks. Indeed, in this case, the illustration of the cups is much more regular.
  • connection radius In the directions with low LANDFORD coefficient, the connection radius has been halved compared to the usual connection radius and multiplied by two in the directions with high coefficient. This comparison was made with respect to stamping methods considered to be the most efficient according to the prior art.
  • the invention allows both to obtain a gain in material and better regularity of the thickness of the collar and the walls of the container obtained, which increases the mechanical strength of the latter.
  • the drawing area of a material in terms of holding force under blank holder is increased.
  • This invention also applies to cups which require, for their obtaining, several stamping and re-stamping sequences, in these cases where the horns and hollow of the horn are an obstacle during re-stamping operations, the intermediate cups do not have flange.
  • the regularity of the thickness of the walls of the stampings is a success factor during subsequent operations.

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)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Packages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Forging (AREA)
EP92402056A 1991-07-17 1992-07-16 Verfahren und Stempel für das Tiefziehen von Behältern mit regelmässiger Wandung Expired - Lifetime EP0524098B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9109053A FR2679158B1 (fr) 1991-07-17 1991-07-17 Procede et poincon d'emboutissage pour la fabrication de recipients a paroi reguliere.
FR9109053 1991-07-17

Publications (2)

Publication Number Publication Date
EP0524098A1 true EP0524098A1 (de) 1993-01-20
EP0524098B1 EP0524098B1 (de) 1995-02-22

Family

ID=9415241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402056A Expired - Lifetime EP0524098B1 (de) 1991-07-17 1992-07-16 Verfahren und Stempel für das Tiefziehen von Behältern mit regelmässiger Wandung

Country Status (6)

Country Link
EP (1) EP0524098B1 (de)
AT (1) ATE118705T1 (de)
DE (1) DE69201465T2 (de)
DK (1) DK0524098T3 (de)
ES (1) ES2070605T3 (de)
FR (1) FR2679158B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994019246A2 (en) * 1993-02-18 1994-09-01 David Robert Sergeant Container end closure
EP0629009A1 (de) * 1993-06-04 1994-12-14 Katayama Special Industries, Ltd. Batteriebehälter, Blech für die Formgebung des Batteriebehälters und Verfahren für die Herstellung des Bleches

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711327B1 (fr) * 1993-10-18 1996-02-02 Lorraine Laminage Flan de tôle apte à un emboutissage en rétreint pour former un récipient.
FR2711328B1 (fr) * 1993-10-18 1996-02-02 Lorraine Laminage Flan de tôle apte à un emboutissage en rétreint pour former un récipient non cylindrique.
DE102011077328A1 (de) * 2011-04-15 2012-10-18 Ball Packaging Europe Gmbh Verfahren und Vorrichtung zum Herstellen einseitig offener Metallbehälter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE477766C (de) * 1928-07-04 1929-06-13 Wilhelm Erfurth Verfahren zum Ziehen von reinen Zinkhuelsen
FR1543122A (fr) * 1966-10-31 1968-10-18 Tno Procédé pour l'emboutissage profond d'objets creux, principalement cylindriques, à partir de flans; serre-flans et bague d'emboutissage pour la mise en oeuvre du procédé
EP0040014A1 (de) * 1980-05-13 1981-11-18 The Continental Group, Inc. Zweiteiliger Behälter mit Konvexboden

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE477766C (de) * 1928-07-04 1929-06-13 Wilhelm Erfurth Verfahren zum Ziehen von reinen Zinkhuelsen
FR1543122A (fr) * 1966-10-31 1968-10-18 Tno Procédé pour l'emboutissage profond d'objets creux, principalement cylindriques, à partir de flans; serre-flans et bague d'emboutissage pour la mise en oeuvre du procédé
EP0040014A1 (de) * 1980-05-13 1981-11-18 The Continental Group, Inc. Zweiteiliger Behälter mit Konvexboden

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994019246A2 (en) * 1993-02-18 1994-09-01 David Robert Sergeant Container end closure
WO1994019246A3 (en) * 1993-02-18 1994-10-13 David Robert Sergeant Container end closure
US5950858A (en) * 1993-02-18 1999-09-14 Sergeant; David Robert Container end closure
EP0629009A1 (de) * 1993-06-04 1994-12-14 Katayama Special Industries, Ltd. Batteriebehälter, Blech für die Formgebung des Batteriebehälters und Verfahren für die Herstellung des Bleches
US5576113A (en) * 1993-06-04 1996-11-19 Katayama Special Industries, Ltd. Battery can, sheet for forming battery can, and method for manufacturing sheet
US5603782A (en) * 1993-06-04 1997-02-18 Katayama Special Industries, Ltd. Battery can, sheet for forming battery can, and method for manufacturing sheet
US5840441A (en) * 1993-06-04 1998-11-24 Katayama Special Industries, Ltd. Battery can, sheet for forming battery can, and method for manufacturing sheet

Also Published As

Publication number Publication date
DE69201465T2 (de) 1995-07-13
FR2679158A1 (fr) 1993-01-22
ES2070605T3 (es) 1995-06-01
ATE118705T1 (de) 1995-03-15
FR2679158B1 (fr) 1995-07-21
DE69201465D1 (de) 1995-03-30
EP0524098B1 (de) 1995-02-22
DK0524098T3 (da) 1995-07-31

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