EP3154727A1 - Support core for a hollow insert for a motor vehicle - Google Patents

Support core for a hollow insert for a motor vehicle

Info

Publication number
EP3154727A1
EP3154727A1 EP15733841.9A EP15733841A EP3154727A1 EP 3154727 A1 EP3154727 A1 EP 3154727A1 EP 15733841 A EP15733841 A EP 15733841A EP 3154727 A1 EP3154727 A1 EP 3154727A1
Authority
EP
European Patent Office
Prior art keywords
support
insert
core
axis
retracted position
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.)
Withdrawn
Application number
EP15733841.9A
Other languages
German (de)
French (fr)
Inventor
Olivier TORRES
Frédéric STABLO
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.)
Plastic Omnium SE
Original Assignee
Plastic Omnium SE
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 Plastic Omnium SE filed Critical Plastic Omnium SE
Publication of EP3154727A1 publication Critical patent/EP3154727A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24—Accessories for locating and holding cores or inserts

Definitions

  • the present invention relates to the technical field of overmolding hollow insert for a motor vehicle. More specifically, but not exclusively, it relates to the overmolding of hollow inserts such as inserts used in the manufacture of structural elements of motor vehicles, including the blank body.
  • the fusible core may be for example in the form of a metal alloy having a melting point lower than that of the insert, so that it can be removed by heating after overmolding. It is for example an alloy of tin, lead or bismuth.
  • the core may also be in the form of sand that can be removed by disintegration at the end of overmolding, or in the form of a pressurized fluid such as water or oil, to withstand applied pressure stresses. on the walls of the insert.
  • the invention aims in particular to provide a core ensuring that an insert will not be deformed during its overmolding, while being able to be placed and removed in a simple manner and low cost.
  • the invention particularly relates to a support core of a hollow insert for a motor vehicle, the core being configured to support internal walls of the insert during an overmolding of this insert, comprising:
  • a support having an axis, substantially parallel to an axis of the insert when the core is in the insert, and
  • An insert support member the support member being movably mounted relative to the support between a support position of the insert and a retracted position, allowing introduction of the core into the insert or withdrawal of the core out of the insert.
  • the support element which can take two different positions, allows the core to be inserted and removed integrally from the insert, without deterioration or destruction.
  • the core can be immediately reusable for next overmolding, and for many cycles. This is particularly advantageous if the process is to be repeated for a large number of inserts, resulting in a gain in time and considerable cost.
  • this support core allows a particularly advantageous method compared to the processes mentioned above. In particular after overmolding the insert, there is no elimination or rejection of material such as a metal alloy, sand or a fluid.
  • the support element can take up these two positions, not only does the support core remain advantageously intact before and after its use, but in addition no residue remains inside the insert after its support.
  • an axis of the insert generally means a geometric axis of the insert defined so that it allows the translation of the support inside the insert along this axis.
  • this axis may be the axis of revolution of the insert or an axis parallel to this axis of revolution.
  • the axis of the insert may be the axis of the tubular body or an axis parallel to this axis of the tubular body.
  • overmolding corresponds to injection of plastic material on the insert. More specifically, overmolding generally allows injection molten plastic material inside a mold in which the insert is located.
  • the core may further include one or more of the following features, taken alone or in combination.
  • the distance between the support member and the support axis when the support member is in the support position is strictly greater than the distance between the support member and the support axis when the support member is in the retracted position.
  • the support element when it takes its support position, away from the support to get closer to the inner walls of the insert, until meeting them and can support them.
  • the support member when it takes its retracted position, the support member is detached from the walls of the insert to move closer to the axis of the support.
  • the support member is configured to move from the retracted position to the support position, and vice versa, by an axial translation of the support inside the insert, the axial translation corresponding to the direction of the axis of the support.
  • the passage from one position to the other is particularly simple, simply move the support relative to the insert to cause a displacement of the support element, or a number of support elements simultaneously, which is particularly advantageous when the core comprises several support elements.
  • the axial translation of the support is advantageously with respect to the armature. It is understood that the translation can be associated with other movements of the support, such as rotation.
  • the displacement of the support can be carried out either manually or, advantageously, by a motor that pushes or releases an end of the support to allow axial translation thereof in both directions inside the insert .
  • the support member and the support each have a sliding surface, in contact with each other, extending along an inclined surface, not parallel to the axis of the support, so that a translation of the support in the axial direction causes a displacement of the support member relative to the support in the transverse direction.
  • the sliding surface may be, for example, in the form of a sliding ramp of the support member relative to the support. The sliding is then at the origin of the displacement of the support element in its support position.
  • the support member has a contact surface with the insert, comprising a relatively flexible material such as an elastomer or other type of soft or flexible material.
  • the material may include, for example, polyetheretherketone (known as PEEK) or a material marketed under the tradename VITON.
  • PEEK polyetheretherketone
  • VITON a material marketed under the tradename VITON.
  • the core comprises a receiving frame of the support member, on which the support member is movably mounted in a direction transverse to the axis of the support, between the support position of the insert and the retracted position, the support being slidably mounted in the axial direction within this frame.
  • This frame serves to carry the support element, while leaving him freedom of movement in the transverse direction.
  • it is particularly advantageous for allowing the support element to move between the support position and the retracted position and to ensure the proper functioning and structural cohesion of the core.
  • the support member moves from the retracted position to the flexural support position, so that it takes a generally domed shape when in the support position.
  • a generally domed shape a form whose material undergoes, at least locally, a curvature, preferably by buckling of the material.
  • This form of support element is particularly advantageous because, due to the generally convex shape, a portion of the support element can come into contact with the inner walls of the insert and thus support them.
  • the support element is a relatively flexible structure, that is to say deformable and elastic, which can be, for example, in the form of a relatively thin blade made of a material such as metal, a plastic material.
  • the support element is fixed on two intermediate elements mounted movable relative to each other, the support element passing from the retracted position to the support position due to the approximation of the two intermediate elements in the axial direction.
  • the axial translation corresponding to the direction of the axis of the support, this approximation being preferably generated by a rotation of the support relative to its axis.
  • the transition from the retracted position to the support position of the support element is particularly simple, requiring only mechanical actuation of one or both intermediate elements. This is particularly advantageous when simultaneously moving several support elements.
  • the setting in motion of one or both intermediate elements is preferably performed by a rotation of the support, the support advantageously having a threaded axis (or threaded).
  • the core is used to support a hollow insert for the manufacture of feet A, B and C, also called front, middle and rear feet, impact beams, floors, technical front panels, longitudinal members, beam reinforcements, sleepers or roof arches of a motor vehicle. It can also be used for any other type of hollow insert used in the automotive industry.
  • the core has at least two, preferably at least three support elements, preferably distributed around the main axis, regularly or not. This allows to support the insert at least in its main directions, further reducing the risk of collapse of the walls of the insert.
  • it can understand more according to the shape of the cross section of the hollow insert. For example, if this cross section is close to a polygonal section, the core advantageously has as many support elements distributed around the main axis as many sides of the polygon.
  • the invention also has for one object a method of overmolding a hollow insert by means of a support core as presented above, in particular a compression overmolding method, comprising the following steps:
  • the insert can be placed on a preparation table, or directly in the mold, before the introduction of the support core inside the insert.
  • FIG. 1a is a schematic view in longitudinal section of a support core according to one embodiment, with a support element in a retracted position,
  • FIG. 1b is a diagrammatic cross-sectional view of the support core of FIG. 1a;
  • FIG. 1c is a view similar to FIG. 1a, the support element being in the support position
  • FIG. 1d is a view similar to FIG. 1b, the support element being in the support position
  • FIGS. 2a and 2b are diagrammatic views in cross-section of a support core according to an alternative embodiment of the core of FIG. 1a, respectively in the retracted position and in the support position,
  • FIG. 3 is a schematic perspective view of a support core according to a second embodiment
  • Figures 4a and 4b are schematic views in longitudinal section of the core of Figure 3, respectively in the retracted position and in the support position.
  • a core 10 for supporting a hollow insert for a motor vehicle comprises a support 12, support elements 14a, 14b, 14c, 14d and an armature 16, an example of which is shown in FIGS. 1a, 1b. , 1c and 1d.
  • the core 10 makes it possible to support the walls of a hollow insert during an overmoulding process, in particular during compression overmolding. It is understood that overmolding corresponds to an injection of plastic material.
  • the support 12 has a longitudinal axis 22, parallel to an axis of the insert when the core 10 is in the insert.
  • the axis of the support 12 and the axis of the insert are coincident or parallel with a certain misalignment because of games or the fact that the core 10 rests on the bottom of the insert.
  • the axis 22 is an axis parallel to the axis of revolution of the cylinder.
  • the support 12 is of elongated general shape.
  • the support 12 further comprises a drive member 24 of generally conical shape about the axis 22.
  • This driving element 24 has a sloping outer surface 20, called sliding surface, intended to cooperate by sliding with the elements support 14a-14d.
  • the support 12 also comprises a handling end 28, allowing its actuation, by a machine or an operator, to push or remove the support 12 axially.
  • the support elements 14a-14d are movably mounted relative to the support 12 between a support position of the insert, visible in FIGS. 1c, 1d, and a retracted position, visible in FIGS. 1a, 1b, allowing introduction of the core 10 into the insert or removal of the core from the insert.
  • the support elements 14a-14d are distributed in groups of four elements distributed around the main axis 22.
  • the support elements 14a-14d each have an activation block or a shoe 26, which is under the general shape of a triangular prism, and having a sliding surface for cooperating with the sliding surface 20 provided on the support 12.
  • This sliding surface is configured so that a displacement of the support 12 along the axis 22 puts in movement the support members 14a-14d in a direction transverse to the axis 22.
  • the support members 14a-14d can move away from or approach the axis 22 to take the position support, to support the insert, or the retracted position, which allows to introduce the core 10 into the insert and or remove the core 10 out of the insert.
  • the support members 14a-14d further comprise a contact plate 30, having a contact surface with the insert and intended to come into contact with the inner walls of the insert when in the support position. These contact plates 30 serve to support the inner walls of the insert.
  • the contact plate 30 preferably comprises an elastomeric material, in order to better fit the walls of the insert.
  • the armature 16 is a reception armature of the support elements 14a-14d. More specifically, the support elements 14a-14d are movably mounted on this frame 16 in a direction transverse to the axis of the support 22, between the support position of the insert and the retracted position. This armature 16 comprises orifices 18 through which the support elements 14a-14d are guided while being mobile in the transverse direction.
  • the armature 16 also carries elements 17 for guiding the support 12 which may be bearings, rings or bearings, in this example being in the form of spacers 17 for guiding the translation of the support 12 along the axis 22.
  • the distance Ds between each support element 14a-14d and the axis 22 of the support 12 when each support element is in the support position is strictly greater than the distance Dr between each support element 14a-14d and the support element 14a-14d. 22 axis of the support when each support member is in the retracted position.
  • the outer dimension of the core when the support members are in the retracted position is less than the outer dimension of the core when the support members are in the support position, so that it is easy to introduce or withdraw the support 12 of the insert in the direction of its axis 22 thanks to the presence of a non-zero clearance corresponding to the difference between the distances Ds and Dr.
  • the support core 10 is first introduced into the interior of the insert, the support members 14a-14d then being in their retracted position illustrated in FIGS. 1a and 1b, and having their contact plate 30 in a position closest to the armature 16. Then, the support elements 14a-14d are moved towards their support position, by translating the support 12 along its axis 22. This translation generates a translation of the element of drive 24 which by sliding of its sliding surface 20 with the corresponding sliding surface of the activation block 26, displaces the support elements in the transverse direction. Thus, the support members 14a-14d deviate from the shaft 22 until their contact plates 30 are plated on the inner walls of the insert to support them. Once the support elements in the support position, the insert is overmolded by injection of material.
  • the support elements 14a-14d are moved towards their retracted position, by translating the support 12 along the axis 22 in the opposite direction, so that the drive elements 24 return to their position. initially due to the presence of biasing elements such as a spring or magnet system in the vicinity of the orifices 18, allowing the support elements to detach from the walls of the insert and to move closer to the axis 22 so as to to find their retracted position. Once in this position, the support core 10 is removed from the insert.
  • the number of supporting elements of the support core 40, as well as their positioning is adapted as a function of the internal shape of the insert 42, particularly as a function of the shape of its cross-section.
  • the angular distribution, the dimension or the contact surface with the insert is adapted.
  • the inner walls of the insert 42 may be irregular in shape, for example with a cross section adjacent to a polygonal section, comprising five support elements in the example.
  • the core advantageously has as many support elements distributed around the axis 22 as many sides of the polygon, namely five support elements in the example.
  • the support core 40 then operates according to a method similar to that presented above.
  • a support core 50 according to a second embodiment comprises a support 52, two support elements 56a and 56b, as well as two intermediate elements 54a and 54b.
  • the support members 56a and 56b are configured to move from the retracted position to the buckling support position outwardly of the core, so that they can assume a generally domed shape when they are in a supportive position.
  • the support elements 56a, 56b are fixed on two intermediate elements 54a and 54b, mounted movable relative to each other, the support elements passing from the retracted position to the support position due to the approximation of the two intermediate elements 54a and 54b in the axial direction of the support 52, corresponding to the direction of the axis of the support 52.
  • This approximation is preferably generated by a rotation of the support 52 relative to its axis.
  • the support 52 here comprises two parts in the form of rods 62a and 62b, threaded in two opposite directions, mounted on a connecting block 64 which maintains the position of the two rods.
  • the intermediate elements 54a and 54b each comprise a threaded orifice, so that a rotation of a rod 62a, 62b causes the displacement of an intermediate element 54a, 54b in one direction or another, when the rod is inserted in the corresponding intermediate element.
  • the two rods 62a, 62b can be brought together, either by turning one of the two rods, for example the rod 62a, which causes the displacement of the corresponding intermediate element, namely the element 54a; either by turning the two rods in opposite directions to generate the displacement of the two intermediate elements in directions opposite, as shown in Figure 4b.
  • the support elements 56a and 56b are in the form of flexible blades, each end of which is mounted on an intermediate element, so that a coming together of the intermediate elements causes the support elements 56a and 56b to bend towards the outside of the core.
  • the overmolding process of a hollow insert by means of the core of Figures 3, 4a and 4b will be described.
  • the support core 50 is inserted inside the insert 58, the support elements 56a and 56b being in their retracted position, that is to say in their position of least stress.
  • the support members 56a and 56b are then moved to their supporting position, illustrated in FIG. 4b, by rotating one or both of the rods so that the intermediate elements 54a and 54b are brought closer to one another. on the other by flexing the support members until they come into contact with the inner walls of the insert 58 to support them.
  • the insert is then overmoulded, by injection of molten plastic material and then by compression.
  • the support elements 56a and 56b are moved towards their retracted position, by rotating one or both rods in the opposite direction so that the intermediate elements 54a and 54b return to their initial position. thus relaxing the support elements that are detached from the walls of the insert to their retracted position. Then, the support core 50 can be removed from the insert.
  • the support cores described above are particularly suitable for supporting a hollow insert for the manufacture of a center pillar or a stretcher of a motor vehicle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The core (10) makes it possible to support a hollow insert for a motor vehicle. It is configured to support the internal walls of the insert while said insert is being overmoulded. It comprises: a holder (12) having an axis (22), parallel to an axis of the insert when the core is in the insert, and a support element (14a-14d) for the insert, said support element being mounted so as to be able to move with respect to the holder (12) between a position supporting the insert and a retracted position, making it possible to introduce the core into the insert or remove the core from the insert.

Description

Noyau de soutien d'un insert creux pour véhicule automobile  Core for supporting a hollow insert for a motor vehicle
La présente invention concerne le domaine technique du surmoulage d'insert creux pour véhicule automobile. Plus précisément mais non exclusivement, elle concerne le surmoulage d'inserts creux tels que les inserts utilisés dans la fabrication d'éléments structurels de véhicules automobiles, notamment de la caisse en blanc. The present invention relates to the technical field of overmolding hollow insert for a motor vehicle. More specifically, but not exclusively, it relates to the overmolding of hollow inserts such as inserts used in the manufacture of structural elements of motor vehicles, including the blank body.
Le surmoulage de tels inserts se fait généralement sous des pressions et des températures relativement élevées. Aussi l'insert, étant creux, est exposé au risque de voir ses parois se déformer ou s'écrouler sous ces contraintes. Il est donc intéressant de soutenir les parois internes de l'insert creux pour résister à ces conditions de surmoulage. The overmoulding of such inserts is generally under relatively high pressures and temperatures. Also the insert, being hollow, is exposed to the risk of its walls deform or collapse under these constraints. It is therefore interesting to support the inner walls of the hollow insert to withstand these overmolding conditions.
On connaît déjà dans l'état de la technique des dispositifs de soutien d'insert creux, sous forme de noyau fusible que l'on introduit à l'intérieur de l'insert pendant le surmoulage et qui est éliminé à l'issue du procédé. Le noyau fusible peut être par exemple sous forme d'un alliage métallique ayant un point de fusion plus faible que celui de l'insert, afin de pouvoir l'éliminer par chauffage après le surmoulage. Il s'agit par exemple d'un alliage d'étain, de plomb ou de bismuth. Le noyau peut également se présenter sous forme de sable pouvant être éliminé par désagrégation à la fin du surmoulage, ou encore sous forme de matière fluide sous pression, telle que de l'eau ou de l'huile, pour supporter les contraintes de pressions appliquées sur les parois de l'insert. Already known in the state of the art hollow insert support devices in the form of fusible core that is introduced inside the insert during overmolding and which is eliminated at the end of the process . The fusible core may be for example in the form of a metal alloy having a melting point lower than that of the insert, so that it can be removed by heating after overmolding. It is for example an alloy of tin, lead or bismuth. The core may also be in the form of sand that can be removed by disintegration at the end of overmolding, or in the form of a pressurized fluid such as water or oil, to withstand applied pressure stresses. on the walls of the insert.
Il se trouve que les méthodes présentées ci-dessus sont des méthodes destructives, qui requièrent un temps de préparation et d'élimination, donc des coûts relativement élevés. En outre, il peut rester de la matière dans l'insert ou dans le moule, ce qui peut causer un endommagement de l'un ou de l'autre, tel que la présence de rouille, de condensation, de fuites d'huile, etc. L'invention a notamment pour but de fournir un noyau garantissant qu'un insert ne sera pas déformé au cours de son surmoulage, tout en pouvant être placé et retiré de façon simple et à coût réduit. It turns out that the methods presented above are destructive methods, which require a time of preparation and elimination, thus relatively high costs. In addition, there may be material in the insert or in the mold, which can cause damage to one or the other, such as the presence of rust, condensation, oil leakage, etc. The invention aims in particular to provide a core ensuring that an insert will not be deformed during its overmolding, while being able to be placed and removed in a simple manner and low cost.
A cet effet, l'invention a notamment pour objet un noyau de soutien d'un insert creux pour véhicule automobile, le noyau étant configuré pour soutenir des parois internes de l'insert lors d'un surmoulage de cet insert, comprenant : To this end, the invention particularly relates to a support core of a hollow insert for a motor vehicle, the core being configured to support internal walls of the insert during an overmolding of this insert, comprising:
- un support présentant un axe, sensiblement parallèle à un axe de l'insert lorsque le noyau est dans l'insert, et  a support having an axis, substantially parallel to an axis of the insert when the core is in the insert, and
- un élément de soutien de l'insert, cet élément de soutien étant monté mobile par rapport au support entre une position de soutien de l'insert et une position rétractée, permettant une introduction du noyau dans l'insert ou un retrait du noyau hors de l'insert.  - An insert support member, the support member being movably mounted relative to the support between a support position of the insert and a retracted position, allowing introduction of the core into the insert or withdrawal of the core out of the insert.
Ainsi l'élément de soutien, pouvant prendre deux positions différentes, permet au noyau d'être inséré et retiré intégralement de l'insert, sans détérioration ni destruction. Il en résulte que le noyau peut être immédiatement réutilisable pour un prochain surmoulage, et pendant de nombreux cycles. Ceci est particulièrement avantageux si le procédé doit être répété pour un grand nombre d'inserts, se traduisant par un gain en temps et en coût considérable. On notera que ce noyau de soutien permet un procédé particulièrement avantageux par rapport aux procédés évoqués précédemment. En particulier après le surmoulage de l'insert, il n'y a pas d'élimination ou de rejet de matière telle qu'un alliage métallique, du sable ou un fluide. De plus, comme l'élément de soutien peut prendre ces deux positions, non seulement le noyau de soutien reste avantageusement intact avant et après son utilisation, mais en outre aucun résidu ne reste à l'intérieur de l'insert après son soutien. Ceci permet de délivrer un insert propre et non altéré, en particulier ne présentant pas de risques de rouille, de condensation, de fuites d'huile ou de tout autre type de pollution. En outre, l'absence de chauffe ou de manipulations de matière (sable, fluide) permet de diminuer les étapes intermédiaires, donc de mieux contrôler le procédé et de réduire les risques imprévisibles. Thus the support element, which can take two different positions, allows the core to be inserted and removed integrally from the insert, without deterioration or destruction. As a result, the core can be immediately reusable for next overmolding, and for many cycles. This is particularly advantageous if the process is to be repeated for a large number of inserts, resulting in a gain in time and considerable cost. Note that this support core allows a particularly advantageous method compared to the processes mentioned above. In particular after overmolding the insert, there is no elimination or rejection of material such as a metal alloy, sand or a fluid. In addition, since the support element can take up these two positions, not only does the support core remain advantageously intact before and after its use, but in addition no residue remains inside the insert after its support. This makes it possible to deliver a clean and unaltered insert, in particular not presenting risks of rust, condensation, oil leaks or any other type of pollution. In addition, the lack of heating or manipulation of material (sand, fluid) reduces the intermediate steps, so better control of the process and reduce unpredictable risks.
On entend généralement par « un axe de l'insert » un axe géométrique de l'insert défini de sorte qu'il permet la translation du support à l'intérieur de l'insert selon cet axe. Par exemple pour un insert ayant une forme générale de révolution, telle qu'une forme cylindrique, cet axe peut être l'axe de révolution de l'insert ou un axe parallèle à cet axe de révolution. Selon un autre exemple, pour un insert ayant une forme générale de corps tubulaire à section polygonale, l'axe de l'insert peut être l'axe du corps tubulaire ou un axe parallèle à cet axe du corps tubulaire. On comprend par ailleurs que le surmoulage correspond à de l'injection de matière plastique sur l'insert. Plus précisément, le surmoulage permet généralement d'injecter de la matière plastique en fusion à l'intérieur d'un moule dans lequel se trouve l'insert. The term "an axis of the insert" generally means a geometric axis of the insert defined so that it allows the translation of the support inside the insert along this axis. For example, for an insert having a general shape of revolution, such as a cylindrical shape, this axis may be the axis of revolution of the insert or an axis parallel to this axis of revolution. In another example, for an insert having a general shape of tubular body with polygonal section, the axis of the insert may be the axis of the tubular body or an axis parallel to this axis of the tubular body. It is also understood that overmolding corresponds to injection of plastic material on the insert. More specifically, overmolding generally allows injection molten plastic material inside a mold in which the insert is located.
Le noyau peut en outre comporter l'une ou plusieurs des caractéristiques suivantes, prises seules ou en combinaison. The core may further include one or more of the following features, taken alone or in combination.
La distance entre l'élément de soutien et l'axe du support lorsque l'élément de soutien est en position de soutien, est strictement supérieure à la distance entre l'élément de soutien et l'axe du support lorsque l'élément de soutien est en position rétractée. Ainsi, l'élément de soutien, lorsqu'il prend sa position de soutien, s'éloigne du support pour se rapprocher des parois internes de l'insert, jusqu'à les rencontrer et pouvoir les soutenir. De même dans le sens inverse, lorsqu'il prend sa position rétractée, l'élément de soutien se détache des parois de l'insert pour se rapprocher de l'axe du support. - L'élément de soutien est configuré pour passer de la position rétractée à la position de soutien, et inversement, par une translation axiale du support à l'intérieur de l'insert, la translation axiale correspondant à la direction de l'axe du support. Ainsi, le passage d'une position à l'autre est particulièrement simple, il suffit de déplacer le support par rapport à l'insert pour entraîner un déplacement de l'élément de soutien, voire d'un certain nombre d'éléments de soutien simultanément, ce qui est particulièrement avantageux lorsque le noyau comprend plusieurs éléments de soutien. En particulier, dans le cas où le noyau comprend une armature de réception de l'élément de soutien, la translation axiale du support se fait avantageusement par rapport à l'armature. On comprend que la translation peut être associée à d'autres mouvements du support, tels que la rotation. On notera que le déplacement du support peut être effectué soit manuellement soit, de façon avantageuse, par un moteur qui pousse ou relâche une extrémité du support pour permettre une translation axiale de celui-ci dans les deux sens à l'intérieur de l'insert. The distance between the support member and the support axis when the support member is in the support position is strictly greater than the distance between the support member and the support axis when the support member is in the retracted position. Thus, the support element, when it takes its support position, away from the support to get closer to the inner walls of the insert, until meeting them and can support them. Similarly in the opposite direction, when it takes its retracted position, the support member is detached from the walls of the insert to move closer to the axis of the support. - The support member is configured to move from the retracted position to the support position, and vice versa, by an axial translation of the support inside the insert, the axial translation corresponding to the direction of the axis of the support. Thus, the passage from one position to the other is particularly simple, simply move the support relative to the insert to cause a displacement of the support element, or a number of support elements simultaneously, which is particularly advantageous when the core comprises several support elements. In particular, in the case where the core comprises a receiving armature of the support element, the axial translation of the support is advantageously with respect to the armature. It is understood that the translation can be associated with other movements of the support, such as rotation. Note that the displacement of the support can be carried out either manually or, advantageously, by a motor that pushes or releases an end of the support to allow axial translation thereof in both directions inside the insert .
L'élément de soutien et le support présentent chacun une surface de glissement, en contact l'une avec l'autre, s'étendant selon une surface inclinée, non parallèle à l'axe du support, de sorte qu'une translation du support dans la direction axiale provoque un déplacement de l'élément de soutien par rapport au support dans la direction transversale. Ainsi la surface de glissement peut se présenter, par exemple, sous forme d'une rampe de glissement de l'élément de soutien par rapport au support. Le glissement est alors à l'origine du déplacement de l'élément de soutien dans sa position de soutien. Ce mécanisme est avantageusement purement mécanique et ne nécessite pas, hormis éventuellement pour la translation initiale du support qui peut être soit une translation pure soit une translation combinée avec d'autres types de mouvements comme par exemple une rotation, d'apport énergétique ou de manœuvres supplémentaires, il est donc très économique. - L'élément de soutien présente une surface de contact avec l'insert, comportant un matériau relativement souple tel qu'un élastomère ou un autre type de matériau mou ou souple. Le matériau peut comprendre, par exemple, du polyétheréthercétone (connu sous le nom de PEEK) ou encore un matériau commercialisé sous la marque VITON. La présence d'un élastomère permet d'assurer un meilleur contact de l'élément de soutien sur la paroi interne de l'insert en épousant la forme de cette dernière qui peut parfois présenter des irrégularités ou de compenser des écarts d'alignement axial entre le noyau et l'insert lors de l'introduction du noyau à l'intérieur de l'insert, avant le déplacement des éléments de soutien. En outre, les risques de chocs, de détérioration et de coincement entre le noyau de soutien et l'insert creux sont réduits pendant l'introduction du noyau à l'intérieur de l'insert et lors du déplacement des éléments de soutien vers leur position de soutien pour s'appuyer contre la face intérieure de l'insert. The support member and the support each have a sliding surface, in contact with each other, extending along an inclined surface, not parallel to the axis of the support, so that a translation of the support in the axial direction causes a displacement of the support member relative to the support in the transverse direction. Thus the sliding surface may be, for example, in the form of a sliding ramp of the support member relative to the support. The sliding is then at the origin of the displacement of the support element in its support position. This mechanism is advantageously purely mechanical and does not require, except possibly for the initial translation of the support which can be either a pure translation or a translation combined with other types of movements such as a rotation, energy supply or additional maneuvers, it is very economical. - The support member has a contact surface with the insert, comprising a relatively flexible material such as an elastomer or other type of soft or flexible material. The material may include, for example, polyetheretherketone (known as PEEK) or a material marketed under the tradename VITON. The presence of an elastomer makes it possible to ensure better contact of the support element on the inner wall of the insert by matching the shape of the latter, which can sometimes have irregularities or to compensate for axial misalignments between the core and the insert during the introduction of the core inside the insert, before the displacement of the support elements. In addition, the risks of impact, deterioration and jamming between the support core and the hollow insert are reduced during the introduction of the core inside the insert and during the displacement of the support elements to their position. support to lean against the inside of the insert.
Le noyau comprend une armature de réception de l'élément de soutien, sur laquelle l'élément de soutien est monté mobile dans une direction transversale à l'axe du support, entre la position de soutien de l'insert et la position rétractée, le support étant monté coulissant dans la direction axiale à l'intérieur de cette armature. Cette armature sert à porter l'élément de soutien, tout en lui laissant une liberté de mouvement dans la direction transversale. Elle est notamment particulièrement avantageuse pour permettre à l'élément de soutien de se déplacer entre la position de soutien et la position rétractée et assurer le bon fonctionnement et la cohésion structurelle du noyau. The core comprises a receiving frame of the support member, on which the support member is movably mounted in a direction transverse to the axis of the support, between the support position of the insert and the retracted position, the support being slidably mounted in the axial direction within this frame. This frame serves to carry the support element, while leaving him freedom of movement in the transverse direction. In particular, it is particularly advantageous for allowing the support element to move between the support position and the retracted position and to ensure the proper functioning and structural cohesion of the core.
L'élément de soutien passe de la position rétractée à la position de soutien par flexion, de sorte qu'il prend une forme globalement bombée lorsqu'il est en position de soutien. On entend par « une forme globalement bombée », une forme dont la matière subit, au moins localement, une courbure, de préférence par flambage de la matière. Cette forme d'élément de soutien est particulièrement avantageuse car, grâce à la forme globalement bombée, une partie de l'élément de soutien peut entrer en contact avec les parois internes de l'insert et ainsi les soutenir. De préférence dans ce cas, l'élément de soutien est une structure relativement souple, c'est-à-dire déformable et élastique, qui peut être, par exemple, sous forme d'une lame relativement fine réalisée dans un matériau tel que du métal, un matériau plastique. L'élément de soutien est fixé sur deux éléments intermédiaires montés mobiles l'un par rapport à l'autre, l'élément de soutien passant de la position rétractée à la position de soutien du fait du rapprochement des deux éléments intermédiaires dans la direction axiale, la translation axiale correspondant à la direction de l'axe du support, ce rapprochement étant de préférence généré par une rotation du support par rapport à son axe. Ainsi, le passage de la position rétractée à la position de soutien de l'élément de soutien est particulièrement simple, ne nécessitant qu'un actionnement mécanique de l'un ou des deux éléments intermédiaires. Ceci est particulièrement avantageux lors du déplacement simultané de plusieurs éléments de soutien. La mise en mouvement de l'un ou des deux éléments intermédiaires est, de préférence, réalisée par une rotation du support, le support présentant avantageusement un axe taraudé (ou fileté). The support member moves from the retracted position to the flexural support position, so that it takes a generally domed shape when in the support position. The term "a generally domed shape", a form whose material undergoes, at least locally, a curvature, preferably by buckling of the material. This form of support element is particularly advantageous because, due to the generally convex shape, a portion of the support element can come into contact with the inner walls of the insert and thus support them. Preferably in this case, the support element is a relatively flexible structure, that is to say deformable and elastic, which can be, for example, in the form of a relatively thin blade made of a material such as metal, a plastic material. The support element is fixed on two intermediate elements mounted movable relative to each other, the support element passing from the retracted position to the support position due to the approximation of the two intermediate elements in the axial direction. , the axial translation corresponding to the direction of the axis of the support, this approximation being preferably generated by a rotation of the support relative to its axis. Thus, the transition from the retracted position to the support position of the support element is particularly simple, requiring only mechanical actuation of one or both intermediate elements. This is particularly advantageous when simultaneously moving several support elements. The setting in motion of one or both intermediate elements is preferably performed by a rotation of the support, the support advantageously having a threaded axis (or threaded).
Le noyau permet de soutenir un insert creux pour la fabrication de pieds A, B et C, également appelés pieds avant, milieu et arrière, de poutres de chocs, de planchers, de faces avant techniques, de longerons, de renforts de poutre, de traverses ou encore d'arches de toit d'un véhicule automobile. Il peut être aussi utilisé pour tout autre type d'insert creux employé dans l'industrie automobile. The core is used to support a hollow insert for the manufacture of feet A, B and C, also called front, middle and rear feet, impact beams, floors, technical front panels, longitudinal members, beam reinforcements, sleepers or roof arches of a motor vehicle. It can also be used for any other type of hollow insert used in the automotive industry.
Le noyau présente au moins deux, de préférence au moins trois éléments de soutien, de préférence répartis autour de l'axe principal, de manière régulière ou non. Ceci permet de soutenir l'insert au moins dans ses directions principales, diminuant encore plus les risques d'effondrement des parois de l'insert. Avantageusement, il peut en comprendre davantage selon la forme de la section transversale de l'insert creux. Par exemple, si cette section transversale est voisine d'une section polygonale, le noyau présente avantageusement autant d'éléments de soutien répartis autour de l'axe principal que de nombre de côtés du polygone. The core has at least two, preferably at least three support elements, preferably distributed around the main axis, regularly or not. This allows to support the insert at least in its main directions, further reducing the risk of collapse of the walls of the insert. Advantageously, it can understand more according to the shape of the cross section of the hollow insert. For example, if this cross section is close to a polygonal section, the core advantageously has as many support elements distributed around the main axis as many sides of the polygon.
L'invention a également pour un objet un procédé de surmoulage d'un insert creux au moyen d'un noyau de soutien tel que présenté ci-dessus, notamment un procédé de surmoulage par compression, comprenant les étapes suivantes : The invention also has for one object a method of overmolding a hollow insert by means of a support core as presented above, in particular a compression overmolding method, comprising the following steps:
- introduction du noyau de soutien à l'intérieur de l'insert, l'élément de soutien étant dans une position rétractée,  - introduction of the support core inside the insert, the support member being in a retracted position,
- déplacement de l'élément de soutien vers sa position de soutien,  moving the support element towards its support position,
- surmoulage de l'insert,  - overmoulding of the insert,
- déplacement de l'élément de soutien vers sa position rétractée,  moving the support element towards its retracted position,
- retrait du noyau de soutien hors de l'insert. On comprend que ce procédé permet de surmouler facilement un ou plusieurs inserts creux simultanément lorsqu'ils ont la même forme. Il peut être répété le nombre de fois voulu avec le même noyau puisque ce dernier est réutilisable à chaque cycle d'injection. - removal of the support core out of the insert. It is understood that this method makes it easy to overmould one or more hollow inserts simultaneously when they have the same shape. It can be repeated the number of times wanted with the same core since it is reusable at each injection cycle.
Selon une configuration du procédé de surmoulage précédent, l'insert peut être posé sur une table de préparation, ou encore directement dans le moule, avant l'introduction du noyau de soutien à l'intérieur de l'insert. L'invention sera mieux comprise à la lecture des figures annexées, qui sont fournies à titre d'exemples et ne présentent aucun caractère limitatif, dans lesquelles : According to a configuration of the above overmoulding process, the insert can be placed on a preparation table, or directly in the mold, before the introduction of the support core inside the insert. The invention will be better understood on reading the appended figures, which are provided by way of examples and are in no way limiting, in which:
la figure 1 a est une vue schématique en coupe longitudinale d'un noyau de soutien selon un mode de réalisation, avec un élément de soutien dans une position rétractée,  FIG. 1a is a schematic view in longitudinal section of a support core according to one embodiment, with a support element in a retracted position,
- la figure 1 b est une vue schématique en coupe transversale du noyau de soutien de la figure 1 a,  FIG. 1b is a diagrammatic cross-sectional view of the support core of FIG. 1a;
la figure 1 c est une vue similaire à la figure 1 a, l'élément de soutien étant en position de soutien,  FIG. 1c is a view similar to FIG. 1a, the support element being in the support position,
la figure 1 d est une vue similaire à la figure 1 b, l'élément de soutien étant en position de soutien,  FIG. 1d is a view similar to FIG. 1b, the support element being in the support position,
les figures 2a et 2b sont des vues schématiques en coupe transversale d'un noyau de soutien selon une variante de réalisation du noyau de la figure 1 a, respectivement en position rétractée et en position de soutien,  FIGS. 2a and 2b are diagrammatic views in cross-section of a support core according to an alternative embodiment of the core of FIG. 1a, respectively in the retracted position and in the support position,
la figure 3 est une vue schématique en perspective d'un noyau de soutien selon un deuxième mode de réalisation,  FIG. 3 is a schematic perspective view of a support core according to a second embodiment,
les figures 4a et 4b sont des vues schématiques en coupe longitudinale du noyau de la figure 3, respectivement en position rétractée et en position de soutien.  Figures 4a and 4b are schematic views in longitudinal section of the core of Figure 3, respectively in the retracted position and in the support position.
Un noyau 10 de soutien d'un insert creux pour véhicule automobile comprend un support 12, des éléments de soutien 14a, 14b, 14c, 14d, ainsi qu'une armature 16, dont un exemple est représenté sur les figures 1 a, 1 b, 1 c et 1 d. Le noyau 10 permet de soutenir les parois d'un insert creux lors d'un procédé de surmoulage, notamment lors d'un surmoulage par compression. On comprend que le surmoulage correspond à une injection de matière plastique. Le support 12 présente un axe longitudinal 22, parallèle à un axe de l'insert lorsque le noyau 10 se trouve dans l'insert. Dans le présent exemple, l'axe du support 12 et l'axe de l'insert sont confondus ou parallèles avec un certain désaxage du fait de jeux ou du fait que le noyau 10 repose sur le bas de l'insert. Par exemple, dans le cas d'un insert cylindrique, l'axe 22 est un axe parallèle à l'axe de révolution du cylindre. Le support 12 est de forme générale allongée. Le support 12 comprend en outre un élément d'entraînement 24, de forme générale conique autour de l'axe 22. Cet élément d'entraînement 24 présente une surface extérieure pentue 20, appelée surface de glissement, destinée à coopérer par glissement avec les éléments de soutien 14a-14d. Le support 12 comprend par ailleurs une extrémité de manutention 28, permettant son actionnement, par une machine ou un opérateur, pour pousser ou retirer axialement le support 12. A core 10 for supporting a hollow insert for a motor vehicle comprises a support 12, support elements 14a, 14b, 14c, 14d and an armature 16, an example of which is shown in FIGS. 1a, 1b. , 1c and 1d. The core 10 makes it possible to support the walls of a hollow insert during an overmoulding process, in particular during compression overmolding. It is understood that overmolding corresponds to an injection of plastic material. The support 12 has a longitudinal axis 22, parallel to an axis of the insert when the core 10 is in the insert. In this example, the axis of the support 12 and the axis of the insert are coincident or parallel with a certain misalignment because of games or the fact that the core 10 rests on the bottom of the insert. For example, in the case of a cylindrical insert, the axis 22 is an axis parallel to the axis of revolution of the cylinder. The support 12 is of elongated general shape. The support 12 further comprises a drive member 24 of generally conical shape about the axis 22. This driving element 24 has a sloping outer surface 20, called sliding surface, intended to cooperate by sliding with the elements support 14a-14d. The support 12 also comprises a handling end 28, allowing its actuation, by a machine or an operator, to push or remove the support 12 axially.
Les éléments de soutien 14a-14d sont montés mobiles par rapport au support 12 entre une position de soutien de l'insert, visible sur les figures 1 c, 1 d, et une position rétractée, visible sur les figures 1 a, 1 b, permettant une introduction du noyau 10 dans l'insert ou un retrait du noyau hors de l'insert. Dans cet exemple, les éléments de soutien 14a-14d sont répartis par groupe de quatre éléments répartis autour de l'axe principal 22. Les éléments de soutien 14a-14d présentent chacun un bloc d'activation ou un patin 26, se présentant sous la forme générale d'un prisme triangulaire, et comportant une surface de glissement destinée à coopérer avec la surface de glissement 20 prévue sur le support 12. Cette surface de glissement est configurée de sorte qu'un déplacement du support 12 suivant l'axe 22 met en mouvement les éléments de soutien 14a-14d dans une direction transversale par rapport à l'axe 22. En d'autres termes, les éléments de soutien 14a-14d peuvent s'éloigner ou se rapprocher de l'axe 22 pour prendre la position de soutien, afin de soutenir l'insert, ou la position rétractée, qui permet d'introduire le noyau 10 dans l'insert et ou de retirer le noyau 10 hors de l'insert. Les éléments de soutien 14a-14d comprennent en outre une plaque de contact 30, présentant une surface de contact avec l'insert et destinée à venir en contact avec les parois internes de l'insert lorsqu'ils sont en position de soutien. Ces plaques de contact 30 servent à supporter les parois internes de l'insert. La plaque de contact 30 comprend de préférence un matériau élastomère, afin de mieux épouser les parois de l'insert. The support elements 14a-14d are movably mounted relative to the support 12 between a support position of the insert, visible in FIGS. 1c, 1d, and a retracted position, visible in FIGS. 1a, 1b, allowing introduction of the core 10 into the insert or removal of the core from the insert. In this example, the support elements 14a-14d are distributed in groups of four elements distributed around the main axis 22. The support elements 14a-14d each have an activation block or a shoe 26, which is under the general shape of a triangular prism, and having a sliding surface for cooperating with the sliding surface 20 provided on the support 12. This sliding surface is configured so that a displacement of the support 12 along the axis 22 puts in movement the support members 14a-14d in a direction transverse to the axis 22. In other words, the support members 14a-14d can move away from or approach the axis 22 to take the position support, to support the insert, or the retracted position, which allows to introduce the core 10 into the insert and or remove the core 10 out of the insert. The support members 14a-14d further comprise a contact plate 30, having a contact surface with the insert and intended to come into contact with the inner walls of the insert when in the support position. These contact plates 30 serve to support the inner walls of the insert. The contact plate 30 preferably comprises an elastomeric material, in order to better fit the walls of the insert.
L'armature 16 est une armature de réception des éléments de soutien 14a-14d. Plus précisément, les éléments de soutien 14a-14d sont montés mobiles sur cette armature 16 dans une direction transversale à l'axe du support 22, entre la position de soutien de l'insert et la position rétractée. Cette armature 16 comprend des orifices 18 à travers lesquels les éléments de soutien 14a-14d, sont guidés tout en étant mobiles dans la direction transversale. L'armature 16 porte par ailleurs des éléments 17 de guidage du support 12 qui peuvent être des paliers, bagues ou roulements, se présentant dans cet exemple sous forme d'entretoises 17 permettant de guider la translation du support 12 suivant l'axe 22. The armature 16 is a reception armature of the support elements 14a-14d. More specifically, the support elements 14a-14d are movably mounted on this frame 16 in a direction transverse to the axis of the support 22, between the support position of the insert and the retracted position. This armature 16 comprises orifices 18 through which the support elements 14a-14d are guided while being mobile in the transverse direction. The armature 16 also carries elements 17 for guiding the support 12 which may be bearings, rings or bearings, in this example being in the form of spacers 17 for guiding the translation of the support 12 along the axis 22.
On comprend que la distance Ds entre chaque élément de soutien 14a-14d et l'axe 22 du support 12 lorsque chaque élément de soutien est en position de soutien, est strictement supérieure à la distance Dr entre chaque élément de soutien 14a-14d et l'axe 22 du support lorsque chaque élément de soutien est en position rétractée. En d'autres termes, la dimension extérieure du noyau lorsque les éléments de soutien sont en position rétractée est inférieure à la dimension extérieure du noyau lorsque les éléments de soutien sont en position de soutien, de sorte que l'on peut aisément introduire ou retirer le support 12 de l'insert dans la direction de son axe 22 grâce à la présence d'un jeu non nul correspondant à la différence entre les distances Ds et Dr. It will be understood that the distance Ds between each support element 14a-14d and the axis 22 of the support 12 when each support element is in the support position, is strictly greater than the distance Dr between each support element 14a-14d and the support element 14a-14d. 22 axis of the support when each support member is in the retracted position. In other words, the outer dimension of the core when the support members are in the retracted position is less than the outer dimension of the core when the support members are in the support position, so that it is easy to introduce or withdraw the support 12 of the insert in the direction of its axis 22 thanks to the presence of a non-zero clearance corresponding to the difference between the distances Ds and Dr.
Le procédé de surmoulage d'un insert creux au moyen du noyau des figures 1 a-1 d va à présent être décrit. The overmoulding process of a hollow insert by means of the core of FIGS. 1a-1d will now be described.
On introduit tout d'abord le noyau de soutien 10 à l'intérieur de l'insert, les éléments de soutien 14a-14d étant alors dans leur position rétractée illustrée sur les figures 1 a et 1 b, et ayant leurs plaque de contact 30 dans une position la plus proche de l'armature 16. Ensuite, on déplace les éléments de soutien 14a-14d vers leur position de soutien, en translatant le support 12 suivant son axe 22. Cette translation génère une translation de l'élément d'entraînement 24 qui par glissement de sa surface de glissement 20 avec la surface de glissement correspondante du bloc d'activation 26, déplace les éléments de soutien dans la direction transversale. Ainsi, les éléments de soutien 14a-14d s'écartent de l'axe 22 jusqu'à avoir leurs plaques de contact 30 plaquées aux parois internes de l'insert afin de les soutenir. Une fois les éléments de soutien en position de soutien, on surmoule l'insert, par injection de matière. A la fin de l'injection, on déplace les éléments de soutien 14a-14d vers leur position rétractée, en translatant le support 12 selon l'axe 22 dans le sens inverse, si bien que les éléments d'entraînement 24 reviennent à leur position initiale grâce à la présence d'éléments de rappel tels que un système de ressort ou d'aimant aux environs des orifices 18, permettant aux éléments de soutien de se détacher des parois de l'insert et de se rapprocher de l'axe 22 afin de retrouver leur position rétractée. Une fois dans cette position, le noyau de soutien 10 est retiré hors de l'insert. Selon une variante, on adapte le nombre d'éléments de soutien du noyau de soutien 40, ainsi que leur positionnement, en fonction de la forme intérieure de l'insert 42, tout particulièrement en fonction de la forme de sa section transversale. Par exemple on adapte la répartition angulaire, la dimension ou encore la surface de contact avec l'insert. Ainsi comme le montrent les figures 2a et 2b, les parois internes de l'insert 42 peuvent être de forme irrégulière, par exemple avec une section transversale voisine d'une section polygonale, comprenant cinq éléments de soutien dans l'exemple. Dans ce cas, le noyau présente avantageusement autant d'éléments de soutien répartis autour de l'axe 22 que de nombre de côtés du polygone, à savoir cinq éléments de soutien dans l'exemple. Le noyau de soutien 40 fonctionne alors selon un procédé similaire à celui présenté précédemment. The support core 10 is first introduced into the interior of the insert, the support members 14a-14d then being in their retracted position illustrated in FIGS. 1a and 1b, and having their contact plate 30 in a position closest to the armature 16. Then, the support elements 14a-14d are moved towards their support position, by translating the support 12 along its axis 22. This translation generates a translation of the element of drive 24 which by sliding of its sliding surface 20 with the corresponding sliding surface of the activation block 26, displaces the support elements in the transverse direction. Thus, the support members 14a-14d deviate from the shaft 22 until their contact plates 30 are plated on the inner walls of the insert to support them. Once the support elements in the support position, the insert is overmolded by injection of material. At the end of the injection, the support elements 14a-14d are moved towards their retracted position, by translating the support 12 along the axis 22 in the opposite direction, so that the drive elements 24 return to their position. initially due to the presence of biasing elements such as a spring or magnet system in the vicinity of the orifices 18, allowing the support elements to detach from the walls of the insert and to move closer to the axis 22 so as to to find their retracted position. Once in this position, the support core 10 is removed from the insert. According to one variant, the number of supporting elements of the support core 40, as well as their positioning, is adapted as a function of the internal shape of the insert 42, particularly as a function of the shape of its cross-section. For example, the angular distribution, the dimension or the contact surface with the insert is adapted. Thus as shown in Figures 2a and 2b, the inner walls of the insert 42 may be irregular in shape, for example with a cross section adjacent to a polygonal section, comprising five support elements in the example. In this case, the core advantageously has as many support elements distributed around the axis 22 as many sides of the polygon, namely five support elements in the example. The support core 40 then operates according to a method similar to that presented above.
Comme cela est représenté sur les figures 3, 4a et 4b, un noyau de soutien 50 selon un deuxième mode de réalisation comprend un support 52, deux éléments de soutien 56a et 56b, ainsi que deux éléments intermédiaires 54a et 54b. As shown in FIGS. 3, 4a and 4b, a support core 50 according to a second embodiment comprises a support 52, two support elements 56a and 56b, as well as two intermediate elements 54a and 54b.
Dans ce mode de réalisation, les éléments de soutien 56a et 56b sont configurés de façon à passer de la position rétractée à la position de soutien par flambage vers l'extérieur du noyau, de sorte qu'ils peuvent prendre une forme globalement bombée lorsqu'ils sont en position de soutien. Plus précisément, les éléments de soutien 56a, 56b sont fixé sur deux éléments intermédiaires 54a et 54b, montés mobiles l'un par rapport à l'autre, les éléments de soutien passant de la position rétractée à la position de soutien du fait du rapprochement des deux éléments intermédiaires 54a et 54b dans la direction axiale du support 52, correspondant à la direction de l'axe du support 52. Ce rapprochement est de préférence généré par une rotation du support 52 par rapport à son axe. In this embodiment, the support members 56a and 56b are configured to move from the retracted position to the buckling support position outwardly of the core, so that they can assume a generally domed shape when they are in a supportive position. Specifically, the support elements 56a, 56b are fixed on two intermediate elements 54a and 54b, mounted movable relative to each other, the support elements passing from the retracted position to the support position due to the approximation of the two intermediate elements 54a and 54b in the axial direction of the support 52, corresponding to the direction of the axis of the support 52. This approximation is preferably generated by a rotation of the support 52 relative to its axis.
Ainsi, le support 52 comprend ici deux parties sous forme de tiges 62a et 62b, filetées dans deux sens opposés, montées sur un bloc de liaison 64 qui maintient la position des deux tiges. Les éléments intermédiaires 54a et 54b comprennent chacun un orifice fileté, de sorte qu'une rotation d'une tige 62a, 62b entraîne le déplacement d'un élément intermédiaire 54a, 54b dans un sens ou dans un autre, lorsque la tige est insérée dans l'élément intermédiaire correspondant. Il en résulte que l'on peut obtenir un rapprochement des deux tiges 62a, 62b, soit en tournant l'un des deux tiges, par exemple la tige 62a, ce qui entraine le déplacement de l'élément intermédiaire correspondant, à savoir l'élément 54a ; soit en tournant les deux tiges dans des sens opposés pour générer le déplacement des deux éléments intermédiaires dans des sens opposés, comme illustré sur la figure 4b. Les éléments de soutien 56a et 56b se présentent sous forme de lames flexibles, dont chacune des extrémités est montée sur un élément intermédiaire, de sorte qu'un rapprochement des éléments intermédiaires entraîne une flexion des éléments de soutien 56a et 56b vers l'extérieur du noyau. Thus, the support 52 here comprises two parts in the form of rods 62a and 62b, threaded in two opposite directions, mounted on a connecting block 64 which maintains the position of the two rods. The intermediate elements 54a and 54b each comprise a threaded orifice, so that a rotation of a rod 62a, 62b causes the displacement of an intermediate element 54a, 54b in one direction or another, when the rod is inserted in the corresponding intermediate element. As a result, the two rods 62a, 62b can be brought together, either by turning one of the two rods, for example the rod 62a, which causes the displacement of the corresponding intermediate element, namely the element 54a; either by turning the two rods in opposite directions to generate the displacement of the two intermediate elements in directions opposite, as shown in Figure 4b. The support elements 56a and 56b are in the form of flexible blades, each end of which is mounted on an intermediate element, so that a coming together of the intermediate elements causes the support elements 56a and 56b to bend towards the outside of the core.
Le procédé de surmoulage d'un insert creux au moyen du noyau des figures 3, 4a et 4b va être décrit. On introduit le noyau de soutien 50 à l'intérieur de l'insert 58, les éléments de soutien 56a et 56b étant dans leur position rétractée, c'est-à-dire dans leur position de moindre contrainte. On déplace ensuite les éléments de soutien 56a et 56b vers leur position de soutien, illustrée sur la figure 4b, en procédant à une rotation de l'une ou de deux des tiges, afin que les éléments intermédiaires 54a et 54b se rapprochent l'un de l'autre en mettant en flexion les éléments de soutien jusqu'à ce qu'ils entrent en contact avec les parois internes de l'insert 58 pour les soutenir. On passe ensuite au surmoulage de l'insert, par injection de matière plastique en fusion puis par compression. Puis, après le surmoulage, on déplace les éléments de soutien 56a et 56b vers leur position rétractée, en procédant à une rotation de l'une ou des deux tiges dans le sens inverse pour que les éléments intermédiaires 54a et 54b reviennent à leur position initiale, relaxant ainsi les éléments de soutien qui se décollent des parois de l'insert pour retrouver leur position rétractée. Ensuite, on peut retirer le noyau de soutien 50 hors de l'insert. The overmolding process of a hollow insert by means of the core of Figures 3, 4a and 4b will be described. The support core 50 is inserted inside the insert 58, the support elements 56a and 56b being in their retracted position, that is to say in their position of least stress. The support members 56a and 56b are then moved to their supporting position, illustrated in FIG. 4b, by rotating one or both of the rods so that the intermediate elements 54a and 54b are brought closer to one another. on the other by flexing the support members until they come into contact with the inner walls of the insert 58 to support them. The insert is then overmoulded, by injection of molten plastic material and then by compression. Then, after overmoulding, the support elements 56a and 56b are moved towards their retracted position, by rotating one or both rods in the opposite direction so that the intermediate elements 54a and 54b return to their initial position. thus relaxing the support elements that are detached from the walls of the insert to their retracted position. Then, the support core 50 can be removed from the insert.
Les noyaux de soutien décrits ci-dessus sont particulièrement adaptés pour de soutenir un insert creux pour la fabrication d'un pied milieu ou d'un brancard de véhicule automobile. The support cores described above are particularly suitable for supporting a hollow insert for the manufacture of a center pillar or a stretcher of a motor vehicle.
On comprend que l'invention n'est pas limitée aux exemples décrits ci-dessus. En particulier, on peut aisément envisager de prévoir un seul élément de soutien, ou encore une multiplicité d'éléments de soutien, selon des formes adaptables au soutien que l'on veut apporter. It is understood that the invention is not limited to the examples described above. In particular, it is easy to envisage providing a single support element, or a multiplicity of support elements, according to forms that are adaptable to the support that is to be provided.

Claims

REVENDICATIONS
1. Noyau de soutien (10, 30, 50) d'un insert creux (32, 58) pour véhicule automobile, le noyau étant configuré pour soutenir des parois internes de l'insert lors d'un surmoulage de cet insert, caractérisé en ce qu'il comprend : Supporting core (10, 30, 50) of a hollow insert (32, 58) for a motor vehicle, the core being configured to support internal walls of the insert during overmolding of said insert, characterized in that what he understands:
- un support (12, 52) présentant un axe (22), sensiblement parallèle à un axe de l'insert lorsque le noyau est dans l'insert, et  a support (12, 52) having an axis (22) substantially parallel to an axis of the insert when the core is in the insert, and
- un élément de soutien (14a-14d ; 56a, 56b) de l'insert, cet élément de soutien étant monté mobile par rapport au support (12, 52) entre une position de soutien de l'insert et une position rétractée, permettant une introduction du noyau dans l'insert ou un retrait du noyau hors de l'insert.  a support element (14a-14d; 56a, 56b) of the insert, this support element being mounted movably relative to the support (12, 52) between a support position of the insert and a retracted position, allowing introducing the core into the insert or removing the core from the insert.
2. Noyau selon la revendication précédente, dans lequel la distance entre l'élément de soutien (14a-14d ; 56a, 56b) et l'axe du support (12, 52) lorsque l'élément de soutien est en position de soutien, est strictement supérieure à la distance entre l'élément de soutien et l'axe du support (12, 52) lorsque l'élément de soutien est en position rétractée. 2. Core according to the preceding claim, wherein the distance between the support member (14a-14d; 56a, 56b) and the axis of the support (12, 52) when the support element is in the support position, is strictly greater than the distance between the support member and the support axis (12, 52) when the support member is in the retracted position.
3. Noyau selon l'une quelconque des revendications précédentes, dans lequel l'élément de soutien (14a-14d) est configuré pour passer de la position rétractée à la position de soutien, et inversement, par une translation axiale du support à l'intérieur de l'insert, la translation axiale correspondant à la direction de l'axe du support (12). A core according to any one of the preceding claims, wherein the support member (14a-14d) is configured to move from the retracted position to the support position, and vice versa, by an axial translation of the support to the inside the insert, the axial translation corresponding to the direction of the axis of the support (12).
4. Noyau selon la revendication précédente, dans lequel l'élément de soutien (14a- 14d) et le support (12) présentent chacun une surface de glissement (20), en contact l'une avec l'autre, s'étendant selon une surface inclinée, non parallèle à l'axe du support, de sorte qu'une translation du support (12) dans la direction axiale provoque un déplacement de l'élément de soutien (14a-14d) par rapport au support dans la direction transversale. 4. Core according to the preceding claim, wherein the support member (14a-14d) and the support (12) each have a sliding surface (20), in contact with one another, extending according to an inclined surface, not parallel to the axis of the support, so that a translation of the support (12) in the axial direction causes a displacement of the support member (14a-14d) relative to the support in the transverse direction .
5. Noyau selon l'une quelconque des revendications précédentes, dans lequel l'élément de soutien (14a-14d ; 56a, 56b) présente une surface de contact avec l'insert, comportant un matériau relativement souple. A core according to any one of the preceding claims, wherein the support member (14a-14d; 56a, 56b) has a contact surface with the insert, having a relatively soft material.
6. Noyau selon l'une quelconque des revendications précédentes, comprenant une armature (16) de réception de l'élément de soutien (14a-14d), sur laquelle l'élément de soutien (14a-14d) est monté mobile dans une direction transversale à l'axe du support (12), entre la position de soutien de l'insert et la position rétractée, le support (12) étant monté coulissant dans la direction axiale à l'intérieur de cette armature (16). 6. Core according to any one of the preceding claims, comprising a frame (16) for receiving the support element (14a-14d), on which the support element (14a-14d) is mounted to move in one direction. transverse to the axis of the support (12), between the support position of the insert and the retracted position, the support (12) being slidably mounted in the axial direction inside this frame (16).
7. Noyau selon l'une quelconque des revendications précédentes, dans lequel l'élément de soutien (56a, 56b) passe de la position rétractée à la position de soutien par flexion, de sorte qu'il prend une forme globalement bombée lorsqu'il est en position de soutien. A core according to any one of the preceding claims, wherein the support member (56a, 56b) moves from the retracted position to the flexural support position, so that it takes a generally domed shape when is in a supportive position.
8. Noyau selon la revendication précédente, dans lequel l'élément de soutien est fixé sur deux éléments intermédiaires (54a, 54b) montés mobiles l'un par rapport à l'autre, l'élément de soutien passant de la position rétractée à la position de soutien du fait du rapprochement des deux éléments intermédiaires (54a, 54b) dans la direction axiale, la translation axiale correspondant à la direction de l'axe du support (52), ce rapprochement étant de préférence généré par une rotation du support (52) par rapport à son axe. 8. Core according to the preceding claim, wherein the support element is fixed on two intermediate elements (54a, 54b) mounted movable relative to each other, the support element passing from the retracted position to the position of support due to the bringing together of the two intermediate elements (54a, 54b) in the axial direction, the axial translation corresponding to the direction of the axis of the support (52), this approximation being preferably generated by a rotation of the support ( 52) relative to its axis.
9. Noyau selon l'une quelconque des revendications précédentes, permettant de soutenir un insert creux pour la fabrication de pieds A, B et C, également appelés pieds avant, milieu et arrière, de poutres de chocs de planchers, de faces avant techniques, de longerons, de renforts de poutre, de traverses ou encore d'arches de toit d'un véhicule automobile. 9. Core according to any one of the preceding claims, for supporting a hollow insert for the manufacture of feet A, B and C, also called front, middle and rear feet, floor impact beams, front panels, of spars, reinforcements of beam, sleepers or roof arches of a motor vehicle.
10. Procédé de surmoulage d'un insert creux au moyen d'un noyau de soutien (10, 30, 50) selon l'une quelconque des revendications précédentes, notamment procédé de surmoulage par compression, comprenant les étapes suivantes : 10. A method of overmolding a hollow insert by means of a support core (10, 30, 50) according to any one of the preceding claims, especially compression molding process, comprising the following steps:
- introduction du noyau de soutien (10, 30, 50) à l'intérieur de l'insert, l'élément de soutien étant dans une position rétractée,  - introducing the support core (10, 30, 50) inside the insert, the support member being in a retracted position,
- déplacement de l'élément de soutien (14a-14d ; 56a, 56b) vers sa position de soutien,  moving the support element (14a-14d; 56a, 56b) towards its support position,
- surmoulage de l'insert,  - overmoulding of the insert,
- déplacement de l'élément de soutien (14a-14d ; 56a, 56b) vers sa position rétractée,  - moving the support member (14a-14d; 56a, 56b) to its retracted position,
- retrait du noyau de soutien hors de l'insert.  - removal of the support core out of the insert.
EP15733841.9A 2014-06-16 2015-06-16 Support core for a hollow insert for a motor vehicle Withdrawn EP3154727A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1455487A FR3022165B1 (en) 2014-06-16 2014-06-16 CORE FOR SUPPORTING A HOLLOW INSERT FOR A MOTOR VEHICLE
PCT/FR2015/051585 WO2015193603A1 (en) 2014-06-16 2015-06-16 Support core for a hollow insert for a motor vehicle

Publications (1)

Publication Number Publication Date
EP3154727A1 true EP3154727A1 (en) 2017-04-19

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ID=51485696

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Application Number Title Priority Date Filing Date
EP15733841.9A Withdrawn EP3154727A1 (en) 2014-06-16 2015-06-16 Support core for a hollow insert for a motor vehicle

Country Status (3)

Country Link
EP (1) EP3154727A1 (en)
FR (1) FR3022165B1 (en)
WO (1) WO2015193603A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903951A (en) * 1972-01-14 1975-09-09 Toyota Motor Co Ltd Method of manufacturing aluminum alloy cylinders and cylinder liners for internal combustion engines
JPH0825016A (en) * 1994-07-14 1996-01-30 Toyota Motor Corp Casting insert and production of casting product with insert using

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
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See also references of WO2015193603A1 *

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WO2015193603A1 (en) 2015-12-23
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