EP3450041B1 - Procédé de fabrication d'un corps creux tubulaire à partir d'une platine métallique découpée et partie de châssis ou de carrosserie pourvue du corps creux issu du procédé - Google Patents

Procédé de fabrication d'un corps creux tubulaire à partir d'une platine métallique découpée et partie de châssis ou de carrosserie pourvue du corps creux issu du procédé Download PDF

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Publication number
EP3450041B1
EP3450041B1 EP17188318.4A EP17188318A EP3450041B1 EP 3450041 B1 EP3450041 B1 EP 3450041B1 EP 17188318 A EP17188318 A EP 17188318A EP 3450041 B1 EP3450041 B1 EP 3450041B1
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EP
European Patent Office
Prior art keywords
shaped
hollow body
blank
tubular
reinforcing element
Prior art date
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Application number
EP17188318.4A
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German (de)
English (en)
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EP3450041A1 (fr
Inventor
Ivan Correas Larreategui
Iñaki Arroyo Llanos
Bidatz Arrieta Aldazabal
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Autotech Engineering Deutschland GmbH
Autotech Engineering SL
Original Assignee
Autotech Engineering Deutschland GmbH
Autotech Engineering SL
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Priority to EP17188318.4A priority Critical patent/EP3450041B1/fr
Publication of EP3450041A1 publication Critical patent/EP3450041A1/fr
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B21D5/015—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments for making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/007—Layered 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
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
    • B21D47/04—Making rigid structural elements or units, e.g. honeycomb structures composite sheet metal profiles

Definitions

  • the invention relates to a method for producing a tubular arc-shaped hollow body from a cut metal blank, in which the hollow body is produced from the blank using U-O forming, so that the hollow body has a slot or edge joint along two abutting edges after the U-O forming of the blank has the formed board.
  • Tubular, in particular tubular, hollow bodies made of metallic material are nowadays often used in motor vehicle construction, for example as components of rear axle carriers and front and rear subframes.
  • a well-known method for producing complex-shaped tubular bodies is what is known as hydroforming (internal high-pressure forming).
  • the tubular body to be produced is formed from a tube using a liquid active medium (usually a water-oil emulsion) by applying internal pressure.
  • the pressures required for this forming process can be up to several thousand bars and are essentially dependent on the material to be formed, the material thickness and the smallest radii to be formed.
  • This hydraulic forming process requires technically complex and expensive tools, the use of which is often not worthwhile for reasons of amortization or results in a high unit price for the parts to be manufactured.
  • From the DE 100 62 836 A1 discloses a method for manufacturing a bent tubular hollow body, wherein the hollow body along its length has round and square shaped areas and follows vertical and/or horizontal bends along its length in the axial direction.
  • a sheet metal blank is first punched, with the sheet metal blank being chosen such that its width has a certain oversize compared to the dimensions of the theoretical development of the finished hollow body.
  • the metal blank is then pre-bent in a bending device designed as a die, in that the side areas of the metal blank are raised to form a U-shape.
  • the upper part of the raised sides of the workpiece is then bent into an inwardly inclined position in the areas of the hollow body that are to be formed into squares, while the ends of the raised sides are rounded inwards in the round areas of the hollow body that are to be formed.
  • the workpiece pre-bent in this way is then pressed into its final shape in a pressing tool, in that the sloping and rounded side areas of the sheet metal blank are joined under pressure without gaps at the seam point running in the longitudinal direction of the hollow body. If necessary, the hollow body is welded at the seam.
  • Components that have one or more complex-shaped tubular body such.
  • B. rear axle and front or rear subframes of motor vehicles are usually provided with reinforcements and / or cross members that are welded to the outside of the tubular body.
  • design specifications must be taken into account so that weight specifications are not exceeded and/or the required installation space is not lost.
  • the EP 2 025 424 A1 discloses a method for producing a tubular support profile for an instrument panel of a motor vehicle.
  • a sheet metal blank is placed in a forming tool, pressed by a stamp into a U-shaped recess in a lower tool and formed into a U-profile in a first forming step.
  • the U-profile becomes one between an upper tool and a lower tool Shaped slotted tube.
  • the longitudinal edges are joined by joining.
  • the method is characterized in that the U-profile is provided with connecting elements in the lower tool. It is optionally provided that sections with different cross-sectional configurations are formed on the support profile.
  • the U.S. 2006/0075920 A1 discloses a method for producing a structural component, in which first a plate made of sheet steel is formed into a shell with a U-shaped cross section, whereupon at least one transverse bulkhead or longitudinal bulkhead is introduced into the shell and fixed in position. The edge areas of the shell lying next to the free edges are then bent around the transverse bulkhead or longitudinal bulkhead to form a tubular or box-shaped longitudinal section and the edges are then welded at least in sections. Beads, embossing and/or openings can be provided in the transverse bulkheads and/or the longitudinal bulkheads.
  • the EP 0 888 835 A1 discloses a method for producing a shaped metal part, in which the shaped metal part is manufactured in several successive forming steps by bending, pressing and/or deep-drawing from a flat sheet metal blank, the metal sheet having a plurality of essentially parallel bending lines and has a channel-shaped profile or partial profile in a cross-section perpendicular to the bending lines.
  • the channel-shaped profile or partial profile is reinforced with at least one reinforcement plate, which is inserted into the profile or partial profile essentially perpendicularly to the bending lines and rigidly attached to the metal sheet before the formed metal part is completed by further forming steps carried out on the metal sheet.
  • the stiffening plates can have at least one through-opening or an open-edged recess.
  • the U.S. 2006/0016078 A1 which forms the basis for the preamble of claim 1, discloses a method of manufacturing a structural component for a motor vehicle, in which an intermediate structural member is formed from a sheet metal blank and defines a channel extending along at least part of its length. A support member is placed within the channel-shaped intermediate structural member and secured to the intermediate structural member by welding. A second molding operation is then performed on the intermediate structural member containing the support member so as to partially enclose and further secure the support member therein. The finished structural component or the intermediate structural element containing the support element can be formed into an arcuate component.
  • the present invention is based on the object of creating a method for producing a tubular arc-shaped hollow body of the type mentioned at the outset, with which such hollow bodies for weight-optimized and/or space-optimized chassis and body components can be produced economically.
  • the arrangement according to the invention of one or more reinforcing elements in the tubular hollow body allows chassis and body components that are weight-optimized and/or space-optimized to be produced economically with such a hollow body.
  • the at least one reinforcement element is preferably arranged on the inside at a specific point of the at least partially U-shaped section of the workpiece and is materially connected to it, so that a peak load on a section of the finished chassis and body component that is relevant to strength, e.g. on a connecting section, on which the tubular hollow body is connected to another component of the component is significantly reduced. Due to the inner partial reinforcement of the tubular hollow body, it and/or a component connected to it can be designed to be lighter.
  • the inner partial reinforcement of the tubular hollow body enables a reduction in the sheet metal thickness of the metal blank (sheet metal blank) used to produce the tubular hollow body.
  • external reinforcement or stiffening elements of the chassis or body component can sometimes be omitted due to the inner partial reinforcement of the tubular hollow body, whereby the overall weight of the chassis or body component can be reduced and installation space for other vehicle units, e.g. vehicle drive components, can be gained.
  • An advantageous embodiment of the method according to the invention provides that the butt edges of the tubular hollow body defining the slot or edge joint are connected to one another by welding, preferably metal active gas welding (MAG welding) or laser beam welding.
  • MAG welding metal active gas welding
  • the dimensional stability of the hollow body is improved by welding the abutting edges of the tubular hollow body.
  • the interior of the hollow body can be protected from the ingress of moisture by a continuous weld seam along the abutting edges.
  • MAG welding which is preferably used to connect the butt edges, enables high welding speeds even with curved butt edges.
  • the welding speed can be at least 10 m/min, preferably at least 15 m/min.
  • the welding wire (filler wire) fed to the welding point during MAG welding melts there in the arc or in the weld pool.
  • the slot delimited by the butt edges to be welded can be reliably filled with the melting additional material of the welding wire.
  • Laser beam welding which can be used as an alternative to connecting the abutting edges, is also characterized by high welding speeds and the ability to produce complicated seam geometries. Due to the precise, very concentrated energy input, there is little heat influence during laser beam welding and consequently only very little thermal distortion of the workpiece is to be expected. With a corresponding configuration of the method according to the invention, the laser beam welding is preferably also carried out using welding wire (filler wire).
  • the filler wire can have essentially the same material composition as the blank from which the tubular hollow body is formed.
  • the filler wire can also contain one or more strength-increasing alloy components, such as manganese, nickel and/or carbon.
  • the active gas can also contain oxygen and/or helium as a mixed gas.
  • Argon or an argon-rich mixed gas with up to 25% by volume of carbon dioxide and/or up to about 5% by volume of oxygen and/or about 20-30% by volume of helium is preferably used as the active gas (protective gas).
  • argon or helium or carbon dioxide or a mixture of at least two of these gas components is preferably used as the protective gas.
  • the tubular arc-shaped hollow body can also be referred to as a bent tubular hollow body. It follows vertical and/or horizontal bends along its length in the axial direction. With a correspondingly designed tubular hollow body, chassis and body components that are weight-optimized and space-optimized can be produced very advantageously.
  • the invention provides that the bending of the blank is carried out in such a way that the blank, which is at least partially U-shaped, defines a channel whose elongated channel base line is convex at least in sections. If necessary, a concave channel section can adjoin the convex section of the channel.
  • the at least one reinforcement element is inserted at least into the convex channel section and is bonded to it on the inside, preferably welded. On the part of the applicant it was found that this results in a made from a metal plate bent tubular hollow body, whose slit or edge joint is convex, can be reliably produced by UO-forming.
  • the at least one reinforcement element is designed as a plate-shaped or disk-shaped reinforcement element.
  • a reinforcement element can be produced inexpensively, for example by being stamped out of sheet metal.
  • the plate- or disc-shaped design of the reinforcement element makes it possible to achieve a considerable increase in stability, in particular an increase in flexural rigidity, with a relatively low weight of the reinforcement element.
  • weight reduction it is advantageous for the plate-shaped or disk-shaped reinforcement element to be a ring-shaped reinforcement element. In this way, a weight reduction can be achieved, with the reinforcing effect nevertheless remaining high.
  • the ring-shaped reinforcing element has at least one cross brace and/or a collar. This increases the dimensional stability of the reinforcement element. Accordingly, the plate thickness (sheet metal thickness) of the ring-shaped reinforcement element can be reduced and thus material and weight can be saved.
  • the at least one reinforcement element is designed in such a way that the tubular hollow body, viewed in cross section, rests completely along its inner contour on the outer peripheral contour of the reinforcement element. This gives the tubular hollow body optimal radial dimensional stability.
  • the at least one reinforcement element can also be designed in such a way that the tubular Viewed in cross section, the hollow body partially rests against the outer peripheral contour of the reinforcing element along its inner contour.
  • the peripheral contour of the reinforcing element arranged in the tubular hollow body and the adjacent inner contour of the tubular hollow body thus delimit at least one through-opening.
  • this configuration promotes a weight reduction of the tubular hollow body, since the reinforcing element arranged therein is significantly smaller and correspondingly lighter in this case compared to a reinforcing element whose peripheral contour rests essentially completely on the inner contour of the tubular hollow body.
  • the at least one reinforcement element delimits a through-opening with the inside of the hollow body, which is located in the region of the slot or edge joint.
  • a further advantageous embodiment of the invention provides that at least two reinforcement elements of the type mentioned are inserted into the at least partially U-shaped section of the formed blank and are integrally connected to the same on the inside, preferably welded.
  • This configuration favors a reliable and weight-optimized design of bent tubular hollow bodies by means of U-O-shaping of a metal blank if the slot or edge joint of the formed blank runs along a convexly curved section of the tubular hollow body (tubular body).
  • three reinforcement elements of the type mentioned can be inserted into an at least partially U-shaped and S-shaped section of the blank as a workpiece and welded to the formed section on the inside, with one of the reinforcement elements in a first, essentially straight channel section of the formed workpiece second the Reinforcing elements are arranged in a transition area between a convexly curved and a concavely curved channel section of the formed workpiece and the third of the reinforcing elements are arranged in a second substantially straight channel section of the formed workpiece.
  • the at least two reinforcement elements are designed differently; in particular, they can have different outer peripheral contours. This configuration favors the weight-optimized production of a complex-shaped tubular body by U-O-shaping a metal plate.
  • a further embodiment of the invention provides that after the insertion of the at least one reinforcement element and before the integral connection, preferably welding, of the reinforcement element to the at least partially U-shaped formed section of the blank, the formed section is calibrated. This further improves the reliability of the subsequent forming of the at least partially U-shaped preformed workpiece into a tubular cross section.
  • the invention relates to a chassis or body component with a tubular, preferably tubular, hollow body produced by the method according to the invention.
  • the torsion beam rear axle 1 shows a section of a torsion beam rear axle 1 as an example of a chassis component of a motor vehicle.
  • the torsion beam rear axle 1 has a left control arm 1.1 and a right control arm (not shown), which are firmly connected to one another by a cross member 1.2 that can be subjected to torsion loads.
  • Both the cross member 1.2 and the link arms 1.1 are designed as tubular hollow bodies.
  • Shell-shaped bracket plates 1.3 and cross braces 1.4 are welded to the link arms 1.1 and the cross member 1.2.
  • the bracket sheet 1.3 is used to store and support a chassis spring and a shock absorber (not shown).
  • the respective link arm 1.1 has a joint bush (bearing bush) 1.5 at one of its ends and a connecting flange 1.6 at the other end for fastening a rear wheel bearing.
  • the link arm 1.1 is designed as a tubular arc-shaped hollow body. It is made from a sheet metal blank, preferably sheet steel blank, by RO forming.
  • an auxiliary frame 2 is shown as a further example of a chassis component of a motor vehicle.
  • the auxiliary frame 2 is used in particular for the articulated mounting of wishbones (not shown) to be connected to the rear wheel carriers. It has two lateral side members (longitudinal members) 2.1 that run essentially longitudinally to the longitudinal center axis of the vehicle and are firmly connected to a front cross member 2.2 and a rear cross member 2.3.
  • the front cross member 2.2 and the side members 2.1 of the rear axle subframe 2 are tubular Formed hollow body, in particular the cross member has 2.2 arcuate sections.
  • the side beams 2.1 and/or the cross beam 2.2 are made from sheet metal blanks, preferably sheet steel blanks, by UO forming.
  • a conventional process for producing a bent tubular body using RO forming is in 3 sketched.
  • the conventional manufacturing process comprises at least four work steps (OP10, OP30, OP50, OP70).
  • a sheet metal blank that is essentially flat and cut to fit to achieve the finished tubular body 5 is partially formed into a U-shape (OP10).
  • the sheet metal blank is formed in such a way that after this forming step (OP10), as in 3 shown top left and bottom left, a channel 3 is defined, the elongated or axial channel base line is arcuate. In 3 the bottom line of the channel is concave.
  • the workpiece (sheet metal blank) 4 formed in this way has two side sections (legs) 4.1 running parallel to one another, which adjoin the channel-shaped section 4.2 laterally and are bent in accordance with the channel base line. Viewed in cross section, the side sections (legs) 4.1 initially protrude in opposite directions from the channel-shaped section 4.2 of the workpiece 4.
  • a subsequent forming step (work step) OP30 the side sections 4.1 are raised, i.e. bent upwards, so that the workpiece 4 then has a U-shaped profile overall when viewed in cross section.
  • a further work step (OP50) the raised side sections 4.1 of the workpiece 4 are then formed in such a way that their longitudinal edges 4.3 are moved towards one another and define a slot or edge joint 4.4.
  • This work step can also be referred to as O-forming.
  • the workpiece 4 now has a tubular cross section.
  • the two longitudinal edges (butt edges) 4.3 are then welded together (OP70), so that the Slit or edge joint 4.4 is preferably completely closed.
  • 4.5 denotes the weld seam on the edge joint 4.4.
  • the method according to the invention differs from that in 3 outlined the conventional process in that after the work process (OP10 and OP30), in which the blank (workpiece 4) is at least partially U-shaped, at least one reinforcement element 6 is inserted into the at least partially U-shaped section 4.2 of the workpiece 4 and internally connected to the same cohesively, preferably welded. At least one further operation (OP50) is then carried out, in which the workpiece 4, which has been formed in a U-shape viewed in cross section, is formed into a hollow body 5 in the form of a tubular arc.
  • the at least one reinforcement element 6 can be ring-shaped, for example, in particular ring-shaped. Further exemplary embodiments of the at least one reinforcement element 6 are shown in FIGS Figures 5 to 8 sketched.
  • the reinforcing element 6 is designed in such a way that in the finished state of the tubular hollow body 5 it is materially bonded to the inner contour of the hollow body 5, for example along at least 30%, preferably at least 40%, particularly preferably at least 50% of its outer contour is connected or it is at least touching.
  • the at least one reinforcement element 6 is preferably inserted into the U-shaped and thus channel-shaped section 4.2 of the workpiece 4 and bonded to the same on the inside after the laterally protruding side sections 4.1 adjoining the channel-shaped section 4.2 have been raised, i.e. bent upwards .
  • the at least one reinforcement element 6 is already integrated into the channel-shaped section 4.2 of the workpiece 4 to be used and bonded to the inside with the same before the laterally protruding side sections 4.1 are bent upwards.
  • the work piece 4 is further formed into a tubular hollow body (tube body) 5 .
  • the two longitudinal edges (butt edges) 4.3 of the workpiece 4 are then welded together so that the slot or edge joint 4.4 is preferably completely closed by the weld seam 4.5.
  • the reinforcing element 6 is designed or dimensioned in such a way that after the O-shaping of the workpiece 4, which is U-shaped when viewed in cross section, in which the workpiece 4 is shaped into a tubular cross section, it is connected to the inside of the hollow body (tubular body) 5 a through-opening 7 which is located in the area of the slot or edge joint 4.4.
  • the shaped workpiece 4 is preferably subjected to an additional calibration process.
  • the integral connection of the reinforcement element 6 ′ to the inside of the workpiece 4 can be embodied as a single continuous connection or weld seam 8 or can comprise a plurality of connection or weld seams.
  • the outer contour of the reinforcement element 6 ′ is welded to the abutting edges 4.3 of the tubular workpiece 4 that face one another.
  • FIGS Figures 5a and 5b outlined variant of the method according to the invention can be produced.
  • the reinforcement element can be designed, for example, in the form of an annular sheet metal disc 6', which has a peripheral collar 6.3 at its through-opening 6.2 ( Figure 7c ).
  • the passage opening 6.2 is circular.
  • the reinforcing element 6' shown is dimensioned such that after the O-shaping of the U-shaped workpiece 4 viewed in cross section, the tubular hollow body 5 rests completely along its inner contour against the outer peripheral contour 6.1 of the reinforcing element 6'.
  • the in the Figures 7e and 7f The reinforcement elements 6 shown are dimensioned such that after the O-shaping of the workpiece 4, which is U-shaped when viewed in cross section, the tubular hollow body 5 only partially rests along its inner contour on the outer peripheral contour 6.1 of the reinforcement element 6, with the reinforcement element 6 being connected to the inside of the hollow body 5 delimits a through opening 7, which is in the area of the slot or edge joint 4.4 (cf. 4 ).
  • the tubular body 5 produced by the method according to the invention using UO-shaping can also be produced in particular by forming a groove 3 in the cut sheet metal blank, the longitudinal or axial groove base of which is convex or both convex and concave.
  • a groove 3 in the cut sheet metal blank, the longitudinal or axial groove base of which is convex or both convex and concave.
  • 8 such an arcuate tubular body 5' is shown as an example.
  • the reinforcement elements 6' are positioned in such a way that a first reinforcement element 6' is arranged in a first, essentially straight section of the formed workpiece 4, a second reinforcement element 6' is arranged in a transition region between the convexly curved and the concavely curved channel section, and the third reinforcement element 6 ′ is arranged in a second, essentially straight channel section of the formed workpiece 4 .
  • the first and the third reinforcement element 6' are preferably arranged at a very small distance from the convex or concave channel section.
  • the reinforcement elements 6, 6′ inserted into the channel-shaped or U-shaped workpiece 4 can be designed differently, preferably have different outer peripheral contours.
  • at least two different reinforcement elements 6, 6 'in the Figures 7c, 7e and 7f shown Reinforcement elements 6, 6' are inserted into the trough-shaped or U-shaped workpiece 4 and welded to the trough-shaped or U-shaped workpiece 4 on the inside before the workpiece 4 is O-shaped.
  • the at least one reinforcement element 6 is preferably arranged in the curved, tubular control arm 1.1 in the area of the connected cross member 1.2 or in the curved, tubular cross member 2.2 in the area of the connected side member 2.1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (8)

  1. Procédé destiné à la fabrication d'un corps creux sous la forme d'une pièce coudée (5, 5') à partir d'une platine métallique découpée, dans lequel le corps creux (5, 5') est fabriqué à partir de la platine via l'application d'une déformation en forme de U-0, d'une manière telle que le corps creux (5, 5'), après la déformation de la platine en forme de U-O, présente une fente ou un joint sur chant (4.4) le long de deux arêtes du bord à souder (4.3) de la platine qui a été déformée; dans lequel, après un processus de travail (OP10, OP30), au cours duquel la platine est soumise à une déformation au moins en partie en forme de U, au moins un élément de renforcement (6, 6') est inséré dans un tronçon de la platine déformée (4), qui a fait l'objet d'une déformation au moins en partie en forme de U, et est relié par adhérence, de préférence soudé, du côté interne, à celui-ci, et que l'on met ensuite en oeuvre au moins un processus de travail supplémentaire (OP50) au cours duquel on soumet à une déformation la platine (4) qui a fait l'objet d'une déformation en forme de U afin d'obtenir le corps creux sous la forme d'une pièce coudée (5, 5'); dans lequel avant et/ou pendant le processus de travail (OP10), au cours duquel la platine est soumise à une déformation au moins en partie en forme de U, on procède à un pliage de la platine, d'une manière telle que la platine, qui a fait l'objet d'une déformation au moins en partie en forme de U, définit une rainure (3) dont la ligne de base longitudinale est réalisée en forme d'arc; dans lequel le pliage de la platine est mis en oeuvre d'une manière telle que la platine, qui a fait l'objet d'une déformation au moins en partie en forme de U, définit une rainure (3) dont la ligne de base longitudinale prend une forme convexe au moins par tronçons, caractérisé en ce que ledit au moins un élément de renforcement (6, 6') représente un élément de renforcement (6, 6') réalisé sous la forme d'une plaque ou d'un disque et également avec une forme annulaire, qui présente au moins une entretoise transversale (6.4) et/ou un rebord (6.3); dans lequel ledit au moins un élément de renforcement (6, 6') est au moins inséré dans le tronçon de rainure réalisé pour prendre une forme convexe et relié par adhérence, de préférence soudé, du côté interne, à ce dernier.
  2. Procédé selon la revendication 1, caractérisé en ce que les arêtes du bord à souder (4.3) du corps creux sous la forme d'une pièce coudée (5, 5'), qui définissent la fente ou le joint sur chant (4.4) sont reliées l'une à l'autre par soudage, de préférence via un soudage au gaz actif métallique ou un soudage par faisceau laser.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que ledit au moins un élément de renforcement (6' 6") est réalisé d'une manière telle que le corps creux sous la forme d'une pièce coudée (5, 5') vient se disposer, lorsqu'on regarde dans une vue en coupe transversale, le long de son contour interne, complètement contre le contour périphérique externe de l'élément de renforcement (6').
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit au moins un élément de renforcement (6) est réalisé d'une manière telle que le corps creux sous la forme d'une pièce coudée (5, 5') vient se disposer, lorsqu'on regarde dans une vue en coupe transversale, le long de son contour interne, en partie contre le contour périphérique externe de l'élément de renforcement (6).
  5. Procédé selon la revendication 4, caractérisé en ce que ledit au moins un élément de renforcement (6) délimite, avec le côté interne du corps creux (5, 5') une ouverture de passage (7) qui est disposée dans la zone de la fente ou du joint sur chant (4.4).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'on insère au moins deux éléments de renforcement de ce type (6, 6') dans le tronçon de la platine qui a été déformée (4), qui a été soumis à une déformation au moins en partie en forme de U, et qu'on les relie, par adhérence, de préférence qu'on les soude, du côté interne, au tronçon en question; dans lequel lesdits au moins deux éléments de renforcement (6, 6') sont de préférence réalisés de manière différente, de préférence présentent des contours périphériques externes différents (6.1)
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que, après l'insertion dudit au moins un élément de renforcement (6, 6') et avant la liaison par adhérence, de préférence avant le soudage de l'élément de renforcement (6, 6') avec le tronçon de la platine (4) qui a été soumis à une déformation au moins en partie en forme de U, on met en oeuvre un étalonnage du tronçon qui a été déformé.
  8. Pièce de châssis ou de carrosserie (1, 2) qui comprend un corps creux sous la forme d'une pièce coudée (5, 5'), fabriqué conformément au procédé selon l'une quelconque des revendications 1 à 7.
EP17188318.4A 2017-08-29 2017-08-29 Procédé de fabrication d'un corps creux tubulaire à partir d'une platine métallique découpée et partie de châssis ou de carrosserie pourvue du corps creux issu du procédé Active EP3450041B1 (fr)

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EP17188318.4A EP3450041B1 (fr) 2017-08-29 2017-08-29 Procédé de fabrication d'un corps creux tubulaire à partir d'une platine métallique découpée et partie de châssis ou de carrosserie pourvue du corps creux issu du procédé

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DE19728582B4 (de) * 1997-07-04 2007-04-26 Volkswagen Ag Verfahren zum Herstellen eines Metallformteils
DE10062836A1 (de) 2000-12-17 2002-06-27 Hubert Schliekmann Gmbh Verfahren zur Herstellung eines rohrförmigen Hohlkörpers
US20060016078A1 (en) * 2004-07-07 2006-01-26 Jeffrey Bladow Method for manufacturing a reinforced structural component, and article manufactured thereby
DE102004049949C5 (de) * 2004-10-13 2009-04-02 Benteler Automobiltechnik Gmbh Strukturbauteil für die Karosserie oder ein Fahrwerk eines Kraftfahrzeugs
DE102007038036B4 (de) * 2007-08-10 2010-11-11 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines rohrförmigen Tragprofils für einen Instrumententräger
DE102010037534A1 (de) 2010-09-14 2012-03-15 Thyssenkrupp Steel Europe Ag Vorrichtung und Verfahren zur Herstellung von zumindest teilweise geschlossenen Hohlprofilen mit drehbaren Gesenkhälften und geringer Taktzeit

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