• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of manufacturing a reinforcing beam having at least one weakness zone arranged so that the flexural strength of the beam is lower at said weakness zone than in the remainder of the beam, characterized in that it comprises in the order an extrusion step (A) of a profile, a cutting step (B) of the profile so as to obtain at least one profile segment, a deformation step (C) located the profile segment intended to create the zone or zones of weakness.
    公开号:FR3035172A1
    申请号:FR1553483
    申请日:2015-04-20
    公开日:2016-10-21
    发明作者:David Figoli；Stephane Mesaric；Laurent Drouot；Christian Lange
    申请人:Constellium Singen GmbH；Peugeot Citroen Automobiles SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to a reinforcement beam for a vehicle, in particular a door reinforcing beam intended to limit the intrusions into the passenger compartment in the event of a side impact.
    [0002] In order to improve crash protection, motor vehicles have beams in some parts of their structure. These beams make it possible to transfer the energy of the impact to parts of the vehicle structure on which the beams are fixed, and thus to limit the intrusions into the space behind said beam. Such beams are used for example in vehicle side doors where they are commonly called side impact reinforcement beam. In a door, a lateral impact reinforcement beam extends between the front edge and the rear edge of the door liner, in areas preferably located in front of elements of the vehicle structure, such as the front foot and the middle foot of the vehicle in the case of a front door. Thus, in the event of a side impact, the forces of the shock are transmitted by the lateral impact reinforcement beam to the structural elements of the vehicle that are the front foot and the middle foot. The disadvantage of these beams is that they deform essentially at the point of impact during the shock, generating significant intrusions into the cabin. In order to control the deformation of the reinforcing beam, patent EP0510060 proposes a reinforcing beam made by extrusion, of variable thickness in the length of the profile and of substantially rectangular section. The largest wall thickness is in the middle of the length of the profile; the thickest wall extends on both sides and constitutes the impact zone. This impact zone is delimited by two notches located on the same face and substantially perpendicular to the longitudinal axis of the beam, so as to locally reduce the rigidity of said beam. Thus, in case of side impact, the beam will bend first at these notches. This design makes it possible to reduce the deflection of the beam in the event of impact, and thus the intrusions due to impact. The notches are made at the time of extrusion of the beam by reducing the thickness of one of the walls of said beam obtained by a displacement of an element at the level of the extrusion head during the extrusion of the profile. .
    [0003] 3035172 2 This beam is complex to achieve because it requires a special tool at the extrusion head to change the thickness of the walls of the beam at the time of the extrusion operation. The object of the present invention is to propose a simple manufacturing method to implement for producing a reinforcement beam comprising at least one weak zone. Another objective is to propose a reinforcing beam comprising at least one zone of weakness that is simple to produce. This object is achieved according to the invention by means of a method of manufacturing a reinforcing beam comprising at least one zone of weakness arranged in such a way that the resistance of the beam to bending is lower in said area. of weakness in the rest of the beam characterized in that it comprises in order a step of extrusion of a profile, a cutting step of the profile so as to obtain at least one profile segment, a step localized deformation of the profile segment intended to create the zone or zones of weakness. Thus, the manufacture of such a beam is simple, and does not require the development of complex manufacturing tools. From a section of constant section obtained by extrusion, obtaining a beam having at least one weak zone is obtained by adding a simple and rapid step of localized deformation of the profile. This localized deformation step may be performed by a punch that locally tears the profile or preferably by a tool that plastically deforms the profile. This localized deformation step locally modifies the geometry of the section of the profile, for example by modifying the surface of the section of the profile segment, the section 25 here designating the section perpendicular to the extrusion direction. In a preferred embodiment of the invention, the extrusion step forms a profile with a plane of symmetry extending along its longitudinal axis, and in that the cutting operation is performed so as to obtain at least two symmetrical profile segments two by two.
    [0004] Thus, in the case of profile segments intended to form the vehicle door reinforcement beam, this symmetry between two profile segments makes it possible to form a reinforcement beam 3035172 for a door positioned on one of the sides of the vehicle from one of said segments, and a reinforcing beam for the door on the other side of the vehicle from the other segment of profile, minimizing the falling of cuts. The cuts can be made for example bevel.
    [0005] In an advantageous embodiment, the cutout may be arranged such that the created profile segment is symmetrical about a plane perpendicular to the longitudinal axis of said profile segment and passing through the middle of its length. Thus, each profile segment obtained is identical by minimizing the falls. In one embodiment of the invention, the step of localized deformation of the profile segment 10 is performed at the same time as a shaping operation of said profile segment by forming intended to give a curvature to said beam. Thus, the creation of the zones of weakness is obtained without adding any operation in the method of manufacturing the reinforcing beam. Indeed, the reinforcing beams are generally curved. This is particularly the case for a reinforcement beam for a vehicle door, since a vehicle door has an outer panel which is curved. To follow the shape of the outer panel closer, the position in the door of the beam requires that said beam is curved. After extruding the profile and cutting the profile segment, a second operation is applied to curve said segment. This shaping is obtained by forming in a bending tool comprising a die and a punch. It is then economically interesting to take advantage of this operation to create the weak areas by adapting the shape of the die and the punch to locally deform the profile segment, and thus obtain the reinforcement beam. The desired deformation to create the weak areas can be expressed as a percentage change in a profile segment dimension.
    [0006] The percentage variation of a segment size of the profile is then typically at least 5% relative to this initial dimension of the profile, preferably at least 10% and more preferably at least 15%. It is also possible to express the deformation to create the zones of weakness by reducing the diameter of the circle in which the section of the profile is inscribed, typically at least 2% with respect to the initial diameter of the circle in which the section of the 3035172 4 profile in the plane perpendicular to the extrusion direction, preferably at least 5% and more preferably at least 10%. In this way, a reinforcement beam having one or more zones of weakness is obtained in a very simple and inexpensive way from a profile produced by extrusion.
    [0007] The invention also relates to a reinforcing beam comprising at least one zone of weakness arranged so that the resistance of the beam to bending is lower at the level of said zone of weakness than in the remainder of the beam, obtained by the method described above. In one embodiment of the reinforcing beam object of the invention, said reinforcing beam has two zones of weakness distributed over the length of said beam. The presence of two zones of weakness makes it possible to reduce the deflection of the beam when a force is applied in the middle of its length. In one embodiment of the reinforcing beam object of the invention, the section of said reinforcing beam is hollow.
    [0008] The beam is thus particularly light while being resistant. In addition, it can be more easily locally deformed to create areas of weakness. In one embodiment of the reinforcing beam object of the invention, said beam is formed of two side walls, preferably parallel and interconnected by at least one connecting wall.
    [0009] In this embodiment of the reinforcing beam object of the invention, one of the side walls may comprise the zone or zones of weakness. Preferably, the beam is a hollow body. Advantageously, in this preferred embodiment, the side walls constituting the outer contours of the hollow body may be interconnected by one or more connecting walls. Preferably, this or these connecting walls are not perpendicular to the side walls and in the case where there are several connecting walls, these connecting walls are not parallel to each other. In one embodiment of the reinforcement cross-beam object of the invention, the zone or zones of weakness are located on a generatrix of the side walls.
    [0010] The invention also relates to a vehicle door comprising at least one reinforcement beam described above. The invention also relates to a vehicle comprising at least one reinforcing beam as described above.
    [0011] The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which: FIG. 1 is a representation of the steps of the method of manufacturing a beam according to the invention. Fig. 2 is a view of a straight section whose ends have been cut in a bevel. Fig. 3 is a perspective view of a reinforcing beam made from the section of FIG. 2 and having two areas of weakness. Fig. 4 is a view of a profile section used to produce the beam segment shown in FIGS. 5 and 6.
    [0012] FIG. 5 is a sectional view of a reinforcing beam with a zone of weakness. Fig. 6 is a sectional view of a reinforcement beam with two zones of weakness. Fig. 7 is a sectional view of the reinforcing beam shown in FIG. 5, in a portion not having a zone of weakness (D-D cut) and a portion 20 representative of the zone of weakness (E-E cut). The drawings are schematic representations to facilitate the understanding of the invention. The components are not necessarily represented on the scale. The same references correspond to the same components from one figure to another. Fig. 1 schematizes the method of manufacturing a reinforcing beam according to the invention. It comprises a first extrusion step A of a profile, followed by a cutting step B of a profile segment to the desired length, and a step C of localized deformation of the profile segment; advantageously, step C also comprises a shaping step. Extrusion step A produces a profile longer than the length of the reinforcement beam to be made. Then, the profile is cut in step B to obtain a segment substantially of the length of the reinforcement beam to be made.
    [0013] Next, one or more zones of weakness are created so as to locally reduce the bending strength of the profile segment during a localized deformation step C of the profile segment. The deformation can be achieved by localized tearing or, preferably, by depressing the profile. This localized deformation step C of the profile segment can be performed at the same time as a step in which the profile segment is curved and / or its shape modified so as to create a reinforcement beam whose shape is adapted to its shape. use. For example, in the context of a reinforcing beam for a vehicle door having a curved outer panel, the beam may be curved to follow the curve of said outer panel 10 of the door. To shape the profile segment, it can be placed in a forming tool consisting of a die and a punch, which tool, by closing, deforms the segment and thus forms the reinforcing beam. The forming tool then comprises the appropriate shapes to punch and deform the profile segment at the desired location or locations so as to create the zone or zones of weakness.
    [0014] In a variant, step C can comprise several substeps, a substep that shapes the entire profile segment, for example by forming it, and a sub-step that locally deforms the profile segment by crushing. to create the zone or zones of weakness. Complementary steps can be carried out between steps A, B or C, or after step C, for example without limitation, surface treatments, heat treatments, or drilling or crimping of nuts. Fig. 2 shows the profile segment 10 after the cutting step B and before the localized deformation and shaping step C. The profile segment 10 has two side walls 103 parallel to each other. Two closure walls 104 extend between the side walls 103 so as to form a hollow body. In the embodiment described in FIG. 2, the closure walls 104 are substantially parallel to each other and substantially perpendicular to the side walls 103. Preferably, a profile having a plane of symmetry extending along its axis will be chosen. longitudinal. The profile segments 10 are obtained by cutting the profile at identical lengths and so as to obtain profile segments 10 which are at least symmetrical in pairs. For example, by defining a marker formed by three X, Y and Z axes, whose X axis is parallel to the longitudinal axis of the profile and the X and Y axes are perpendicular to each other and perpendicular to the Z axis. , the shape of the section of the profile is preferably chosen so that the profile is symmetrical with respect to a plane parallel to the XY plane passing halfway along the side wall and the section segment 10 is obtained by making cuts in planes parallel to the same plane containing the Z axis and symmetrical with respect to a plane perpendicular to the axis X. FIG. 3 shows a reinforcing beam 1 formed from the profile segment 10 illustrated in FIG. 2. The beam 1 has side walls 3 corresponding to the side walls 103 of the profile segment 10, and connecting walls 4 corresponding to the connecting walls 104 of said profile segment. The beam 1 has two zones of weakness 2 made by localized deformation of the beam on one of the side walls 3. The deformation is achieved by localized crushing of the beam so as to create a depression on said lateral surface 3. These zones of weakness 2 reduce the flexural strength of the reinforcing beam 1. In the case of a reinforcing beam 1 intended to be installed in a vehicle door having a curved outer panel, and in order to follow the shape of the outer panel , the reinforcing beam 1 is curved. This curve is made by deforming the profile segment 10 of FIG. 2 using a forming tool consisting of a die and a punch, defining a footprint of the reinforcing beam 1 in which is placed said profile segment 10. The closure of said forming tool 20 will give the curvature of the reinforcement beam 1. The cavity further comprises protuberances which make it possible to locally crush the beam 1 so as to form the zones of weakness 2. In a variant, the reinforcing beam 1 may comprise only one single zone of weakness. In another variant, the reinforcing beam 1 has two zones of weakness 2 or more than two zones of weakness 2. In another variant, the zone or zones of weakness 2 may be formed by punching which tear or cut at least in part one of the walls 3 or 4 of the reinforcing beam 1. Alternatively, the section of the reinforcing beam 1 may be of different shape, for example of circular section, oval, triangular, or more shape complex. Said beam 1 can also be of solid section.
    [0015] The reinforcing beam 1 can be made of aluminum or aluminum alloy, magnesium or magnesium alloy. In a preferred embodiment, the aluminum alloy is an alloy of the 6000 series, more preferably the alloy 6082. In a preferred embodiment, the yield strength Rp0.2 of the aluminum alloy , measured by a tensile test according to ISO 6892-1 is at least 250 MPa, preferably greater than 320 MPa. In the case of a reinforcing beam 1 for a vehicle door, the zone or zones of weakness 2 are preferably arranged on the side of the beam 1 facing the outside of the vehicle when the reinforcing beam 1 is installed on the vehicle. door and door on the vehicle. Thus, in the event of a lateral impact against the vehicle, the beam will deform by folding at the level of the zone or zones of weakness 2 preferably situated between the middle of the length of the reinforcing beam 1 and one of the ends. of said reinforcing beam 1, which will reduce the distance on which the reinforcing beam 1 is deformed. Intrusions into the passenger compartment of the vehicle are thus reduced.
    [0016] FIG. 4 represents the section of the section 10 used to make the reinforcing beams 1 shown in FIGS. 5 and 6. The profile comprises two side walls 103 parallel to each other and having a thickness of 2.5 mm and two closure walls 104 with a thickness of 2 mm. The height of the profile, that is to say its dimension between the faces of the two side walls, is 30 mm.
    [0017] Fig. 5 represents a reinforcing beam 1 with a single weak zone 2 made according to the invention. The zone of weakness 2 is located in the first third of the length of the reinforcing beam 1. It is made by localized deformation at the same time as the shaping operation. The sectional view of the zone of weakness 2 is shown in FIG. 7 and corresponds to the section E-E marked in FIG. 5. The D-D cut also visible in fig. 7 corresponds to a portion of the reinforcing beam 1 not undergoing deformation during the shaping operation. The section D-D is similar to the section shown in FIG. 4 corresponding to the initial section of the profile. The localized deformation reduces the height of the profile by 5 mm, which corresponds to a height reduction of 17%. Fig. 6 shows a reinforcement beam 1 with two weak zones 2 made according to the invention. A first zone of weakness 2 is located in the first third of the length of the reinforcing beam 1 and the second zone of weakness 2 is located in the third third of the length of the reinforcing beam 1. This reinforcing beam 1 is 3035172 9 geometrically distinguishes from the reinforcing beam 1 shown in FIG. 5 by the only second zone of weakness. The presence of the zone or zones of weakness 2 makes it possible to reduce the intrusion into the passenger compartment. This is an interest in the safety of passengers. 5
    权利要求:
    Claims (5)
    [0001]
    CLAIMS1 / A method of manufacturing a reinforcing beam (1) comprising at least one zone of weakness (2) arranged in such a way that the resistance of the beam (1) to bending is lower at said zone of weakness (2) that in the rest of the beam (1), characterized in that it comprises in order an extrusion step (A) of a profile a cutting step (B) of the profile so as to obtaining at least one profile segment (10) a localized deformation step (C) of the profile segment (10) intended to create the zone or regions of weakness (2).
    [0002]
    2 / A method according to claim 1 characterized in that the extrusion step (A) forms a profile with a plane of symmetry extending along its longitudinal axis, and in that the cutting operation (B ) is made so as to obtain at least two profile segments (10) symmetrical two by two.
    [0003]
    3 / A method of producing a reinforcing beam (1) according to one of claims 1 or 2 characterized in that the localized deformation step (C) of the profile segment is performed at the same time as an operation of shaping said profile segment (10) by forming to give a curvature to said beam (1).
    [0004]
    4 / reinforcing beam (1) comprising at least one zone of weakness (2) arranged in such a way that the resistance of the beam (1) to bending is lower at the level of said zone of weakness (2) than in the remainder of the beam (1) obtained by the method according to one of claims 1 to 3.
    [0005]
    5 / reinforcement beam (1) according to claim 4 characterized in that it comprises two weak areas (2) distributed over the length of said beam (1). 6 / reinforcing beam (1) according to one of claims 4 or 5 characterized in that its section is hollow. 5 7 / reinforcement beam (1) according to one of claims 4 to 6 characterized in that it is formed of two parallel side walls (3) and interconnected by at least one connecting wall (4). 8 / reinforcement beam according to claim 7 characterized in that one of the side walls (3) comprises the zone or zones of weakness (2). 9 / vehicle door comprising a reinforcing beam (1) according to one of claims 4 to 8. 15 10 / vehicle comprising a reinforcing beam (1) according to one of claims 4 to 8 or a next door claim 9. 20
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    同族专利:
    公开号 | 公开日
    CN107921850B|2021-07-27|
    MX2017013385A|2018-03-07|
    FR3035172B1|2017-11-24|
    EP3286028B1|2021-09-08|
    US20180086183A1|2018-03-29|
    EP3286028A1|2018-02-28|
    WO2016169794A1|2016-10-27|
    US10457123B2|2019-10-29|
    CN107921850A|2018-04-17|
    引用文献:
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    JP5907121B2|2013-06-11|2016-04-20|トヨタ自動車株式会社|Body front structure|
    FR3035172B1|2015-04-20|2017-11-24|Peugeot Citroen Automobiles Sa|EXTRUDED REINFORCING BEAM WITH PROGRAMMED DEFORMATION|FR3035172B1|2015-04-20|2017-11-24|Peugeot Citroen Automobiles Sa|EXTRUDED REINFORCING BEAM WITH PROGRAMMED DEFORMATION|
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    法律状态:
    2016-03-22| PLFP| Fee payment|Year of fee payment: 2 |
    2016-10-21| PLSC| Publication of the preliminary search report|Effective date: 20161021 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 3 |
    2018-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-29| CA| Change of address|Effective date: 20180312 |
    2018-06-29| CD| Change of name or company name|Owner name: PEUGEOT CITROEN AUTOMOBILES SA, FR Effective date: 20180312 Owner name: CONSTELLIUM SINGEN GMBH, DE Effective date: 20180312 |
    2020-03-19| PLFP| Fee payment|Year of fee payment: 6 |
    2021-03-23| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1553483A|FR3035172B1|2015-04-20|2015-04-20|EXTRUDED REINFORCING BEAM WITH PROGRAMMED DEFORMATION|FR1553483A| FR3035172B1|2015-04-20|2015-04-20|EXTRUDED REINFORCING BEAM WITH PROGRAMMED DEFORMATION|
    PCT/EP2016/057853| WO2016169794A1|2015-04-20|2016-04-08|Extruded reinforcement beam having programmed deformation|
    MX2017013385A| MX2017013385A|2015-04-20|2016-04-08|Extruded reinforcement beam having programmed deformation.|
    CN201680023284.3A| CN107921850B|2015-04-20|2016-04-08|Pressing reinforcing beam capable of being deformed in programmed mode|
    EP16719038.8A| EP3286028B1|2015-04-20|2016-04-08|Extruded reinforcement beam with prepared deformation|
    US15/566,632| US10457123B2|2015-04-20|2016-04-08|Extruded reinforcement beam having programmed deformation|
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