EP0823297A1 - Verfahren zum Herstellen metallischer Platten mit veränderlicher Flächenstärke - Google Patents

Verfahren zum Herstellen metallischer Platten mit veränderlicher Flächenstärke Download PDF

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Publication number
EP0823297A1
EP0823297A1 EP97202304A EP97202304A EP0823297A1 EP 0823297 A1 EP0823297 A1 EP 0823297A1 EP 97202304 A EP97202304 A EP 97202304A EP 97202304 A EP97202304 A EP 97202304A EP 0823297 A1 EP0823297 A1 EP 0823297A1
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EP
European Patent Office
Prior art keywords
adhesive
thickness
plates
subjected
plate
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
EP97202304A
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English (en)
French (fr)
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EP0823297B1 (de
Inventor
Pascal Magain
Valentin Thibault
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre SA
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
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Application filed by Cockerill Sambre SA filed Critical Cockerill Sambre SA
Publication of EP0823297A1 publication Critical patent/EP0823297A1/de
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Anticipated expiration legal-status Critical
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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
    • B21D49/00—Sheathing or stiffening objects
    • B21D49/005—Hollow objects

Definitions

  • the present invention relates to a method for the manufacture of metal plates, such as steel sheets, having local variations in thickness and intended to be subjected to a deformation operation, such as for example stamping or bending.
  • This is especially important in the automotive field in as part of the overall trend towards lighter vehicles.
  • This technique consists more particularly in not providing a thicker important of the sheets only in the places necessary for reasons of impact resistance, inertia or rigidity for example. It exists currently joining techniques which allow to associate several parts of plates by means of a weld.
  • laser welding is subject to a certain number of significant limitations.
  • the ratio between the thicknesses of plate parts generally cannot exceed 3.
  • the tolerances of cutting parts of the plate to be welded are very narrow.
  • the shape of weld beads cannot be too complex, so that one is generally limited to straight or slightly curved welds.
  • the weld bead being generally not very deformable, it is therefore a question of plan for it in areas that will not be slightly deformed, so some parts are unworkable.
  • One of the essential aims of the present invention is to present a very simple process requiring no special tools and economically interesting which, moreover, makes it possible to remedy the drawbacks joining techniques of which question above.
  • At least one additional thickness is fixed on at at least one of the faces of the latter in appropriate places by means of a sticky and ductile adhesive at room temperature which can form a layer firmly attached to the face of the plates and to the extra thickness applied to it, so as to form a rigid whole.
  • a polymerizable adhesive is used, preferably hot.
  • the plate provided with this allowance is first subjected to a deformation to give it the desired shape and then we undergoes a cooking operation, for example after having subjected it to a paint treatment, allowing the adhesive to polymerize and thus fix rigidly the additional thickness to the metal plate.
  • Figure 1 is a partial schematic perspective view a metal plate with front reinforcement thicknesses deformation.
  • Figure 2 is, on a larger scale, a section along the line II-II of figure 1.
  • FIG 3 is a partial schematic perspective view a shock absorber made from two plates of the type shown in Figure 1.
  • Figure 4 is a schematic perspective view of a middle foot of a car provided with an internal thickness according to the invention.
  • Figure 5 is a section along line V-V- of Figure 4.
  • the present invention relates to a method for manufacturing of metal plates, more particularly of steel sheets, having one or more local thickness variations, which are intended to be subjected to a deformation operation, such as a stamping or folding.
  • This process is characterized by the fact that, before submitting a plate in a deformation operation, at least one extra thickness on at least one of the faces of this plate in one place suitable, which is for example particularly solicited, by means of a sticky and ductile adhesive at room temperature in such a way to form a layer which fixes firmly, on the one hand, to the plate and, on the other hand part, at the extra thickness to form a perfectly united whole.
  • the thickness of the adhesive itself is as small as possible, for example at most 1 mm and preferably 0.5 mm, so that the contact between the extra thickness and the plate is as intimate as possible and that this adhesive cannot influence mechanical and stamping properties.
  • the thickness is preferably of the same nature as the plate on which it is fixed.
  • the method according to the invention consists in applying reinforcements located in any shape on a blank before stamping at using an adhesive which is preferably heat-polymerizable, by example during a thermal operation after stamping at temperatures in the range of 120 ° C to 220 ° C.
  • pressure can be applied to the allowance before or during polymerization or cooking.
  • the adhesive is advantageously in the form of a flexible tape to double sticky face preferably with a thickness of the order of 0.5 mm.
  • One type of adhesive that works very well is a base adhesive an acrylic and / or epoxy resin of the "3M Structural Binding Tape” type 9245 ", marketed by Minnesota Mining and Manufacturing Company (3M).
  • the stamping is not at all hampered by the presence of the extra thickness since the adhesive, in the non-polymerized state, has flexibility properties that allow it to follow the flow of plates with the extra thicknesses during stamping.
  • This example concerns the manufacture of a shock absorber as shown in Figure 3.
  • Such a blank 1 has been illustrated in FIGS. 1 and 2. As shown in more detail in FIG. 2, these thicknesses 2 are fixed to the blanks 1 by a adhesive tape 3.
  • This is in particular a double-sided sticky tape made of acrylic resin, known under the trade name "TESA 51965" not requiring subsequent polymerization.
  • the thicknesses 2 are formed by steel strips of a 0.4 mm thick and 20 mm wide.
  • the adhesive tapes mentioned above 3, having the same width as the steel strips 2, are first placed on these last and the assembly thus obtained is then pressed by a standard 1 kg roller on the blanks 1 in the appropriate places.
  • the blanks 1 carrying the steel strips 2 are deformed by stamping using a conventional die so as to obtain two identical parts with U-shaped cross-section and each provided with two flanges side 4.
  • the steel strips 3 thus take the form of a square at identical wings.
  • This example relates to the realization of a mid-foot of automobile, i.e. the amount between the front door and the rear door. It has a length of 1.2 m. Such a foot was shown schematically in Figures 4 and 5.
  • the shock absorber of Example 1 we start from a steel blank 1 on which steel reinforcing strips 2 are fixed.
  • the blank 1 also has a thickness of 0.8 mm, while the reinforcements 2 have a thickness of 0.4 mm.
  • These last are applied to the blank 1 by means of a double-sided adhesive tape 3 sticky type marketed by Minnesota Mining and Manufacturing Company under the trade name "3M Structural Binding Tape 9245 ". This tape is flexible enough to withstand stamping.
  • the stamped part thus obtained passes the paint line comprising a cooking step at a temperature of the order of 180 ° C.
  • the resin, from which the adhesive tape is made, polymerizes this temperature by forming a very rigid link between the blank 1 and the strip of reinforcement 2. There is therefore no additional operation to carry out this polymerization.
  • the weight is, in this case, of 3,414 kg whereas, according to the invention, thanks to the presence of reinforcements at suitable locations, it is slightly reduce this weight by 300 g.
  • the process according to the invention is not limited to the embodiments described above and illustrated by attached drawings, but that many variations can be envisaged without departing from the scope of the present invention. It is the same for the adhesive used which can also be in the form of a coating, for example, applied with a brush or by spraying on the surfaces of the blank and reinforcements to be applied to these past. In addition, we can, in some cases, also make use of an adhesive that does not require polymerization or an adhesive for which polymerization can take place at room temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Physical Vapour Deposition (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Control Of Metal Rolling (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
EP97202304A 1996-08-06 1997-07-24 Verfahren zum Herstellen metallischer Platten mit veränderlicher Flächenstärke Revoked EP0823297B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9600685 1996-08-06
BE9600685A BE1010460A3 (fr) 1996-08-06 1996-08-06 Procede de fabrication de plaques metalliques a epaisseur variable.

Publications (2)

Publication Number Publication Date
EP0823297A1 true EP0823297A1 (de) 1998-02-11
EP0823297B1 EP0823297B1 (de) 2002-08-28

Family

ID=3889911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97202304A Revoked EP0823297B1 (de) 1996-08-06 1997-07-24 Verfahren zum Herstellen metallischer Platten mit veränderlicher Flächenstärke

Country Status (7)

Country Link
EP (1) EP0823297B1 (de)
AT (1) ATE222823T1 (de)
BE (1) BE1010460A3 (de)
DE (1) DE69714925T2 (de)
DK (1) DK0823297T3 (de)
ES (1) ES2183077T3 (de)
PT (1) PT823297E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029467C1 (de) * 2000-06-21 2002-04-18 Daimler Chrysler Ag Verfahren zum Versteifen umfänglich geschlossener Hohlprofile
WO2005061146A1 (de) * 2003-12-09 2005-07-07 Daimlerchrysler Ag Verfahren und vorrichtung zum versteifen eines umfänglichen geschlossenen hohlprofils

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971688A (en) * 1974-12-20 1976-07-27 Fruehauf Corporation Method of making an elongate, transversely reinforced metal sheet
FR2376745A1 (fr) * 1977-01-07 1978-08-04 Peugeot Aciers Et Outillage Procede de fabrication d'un produit composite metallique en profile ou en feuille utilisable notamment dans le batiment.
GB2187409A (en) * 1986-03-05 1987-09-09 British Steel Corp Channel section member
US4727232A (en) * 1985-10-18 1988-02-23 Nissan Motor Co., Ltd. Method for joining two metal plates with sealant therebetween
WO1994021740A1 (en) * 1993-03-25 1994-09-29 Ab Volvo Process for producing an adhesive bond in a folded joint

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971688A (en) * 1974-12-20 1976-07-27 Fruehauf Corporation Method of making an elongate, transversely reinforced metal sheet
FR2376745A1 (fr) * 1977-01-07 1978-08-04 Peugeot Aciers Et Outillage Procede de fabrication d'un produit composite metallique en profile ou en feuille utilisable notamment dans le batiment.
US4727232A (en) * 1985-10-18 1988-02-23 Nissan Motor Co., Ltd. Method for joining two metal plates with sealant therebetween
GB2187409A (en) * 1986-03-05 1987-09-09 British Steel Corp Channel section member
WO1994021740A1 (en) * 1993-03-25 1994-09-29 Ab Volvo Process for producing an adhesive bond in a folded joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029467C1 (de) * 2000-06-21 2002-04-18 Daimler Chrysler Ag Verfahren zum Versteifen umfänglich geschlossener Hohlprofile
US6793122B2 (en) 2000-06-21 2004-09-21 Daimlerchrysler Ag Method for the production of reinforced hollow sections with a continuous periphery
WO2005061146A1 (de) * 2003-12-09 2005-07-07 Daimlerchrysler Ag Verfahren und vorrichtung zum versteifen eines umfänglichen geschlossenen hohlprofils

Also Published As

Publication number Publication date
PT823297E (pt) 2002-12-31
DE69714925D1 (de) 2002-10-02
ES2183077T3 (es) 2003-03-16
BE1010460A3 (fr) 1998-09-01
EP0823297B1 (de) 2002-08-28
DK0823297T3 (da) 2003-01-06
ATE222823T1 (de) 2002-09-15
DE69714925T2 (de) 2003-04-24

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