WO2006024710A1 - Method for producing a damping member, a damping member produced by said method and damping device using said member - Google Patents

Method for producing a damping member, a damping member produced by said method and damping device using said member Download PDF

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Publication number
WO2006024710A1
WO2006024710A1 PCT/FR2005/001413 FR2005001413W WO2006024710A1 WO 2006024710 A1 WO2006024710 A1 WO 2006024710A1 FR 2005001413 W FR2005001413 W FR 2005001413W WO 2006024710 A1 WO2006024710 A1 WO 2006024710A1
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WIPO (PCT)
Prior art keywords
support
damping
block
compact block
compact
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Application number
PCT/FR2005/001413
Other languages
French (fr)
Inventor
Reza Rosier
François MOBAILLY
Original Assignee
Musthane
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Publication date
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Publication of WO2006024710A1 publication Critical patent/WO2006024710A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/30Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium

Definitions

  • the present invention relates to the field of damping shocks and / or mechanical vibrations. It relates more particularly to a damping element comprising a gel, its manufacturing method and a device implementing it.
  • cushion-type structures which comprise an envelope inside which damping material is housed.
  • the envelope is made in the form of a thin film of a material with a high coefficient of elongation and high elasticity, while the damping material is chosen so that its creep varies with the pressure exerted.
  • a thermoplastic polyurethane material as the casing and as a damping material a silicone gel or the like.
  • the damping element is in the form of a case inside which the object to be protected can be housed. This case has the overall shape of a rectangular parallelepiped.
  • This embodiment requires the making, from a thin film, of a first outer envelope and a second inner envelope, the use of templates for maintaining the shape of these two envelopes during the introduction into space free between the two said envelopes of the two-component mixture, and then closing the opening between the two envelopes after crosslinking of the gel.
  • this manufacturing technique which is already very difficult for a fairly simple geometric configuration, prohibits to consider much more complex geometric shapes for the damping element.
  • the damping element comprises a foam with open cavities and, injected into said cavities, a second material capable of elastically deforming in said open cavities during a mechanical impact and / or pressure exerted on said element.
  • this damping element may comprise an outer casing to increase its mechanical strength and prevent contact of the foam and the other material with the object to be protected.
  • This envelope is not necessarily waterproof or perfectly adapted to the configuration of its contents.
  • the first object of the present invention is to provide a simplified manufacturing technique for a cushion-type cushioning element, without the need to use a foam as in document FR.2.831.235.
  • the method of manufacturing a damping element having a given geometrical configuration consists of: a) forming by molding, imprinting, cutting or any other suitable means a compact block of a polymer gel having said geometric configuration and b) forming on all or part of the outer surface of said block a polymer film by spraying, depositing or spraying and crosslinking a crosslinkable dispersion of said polymer.
  • the outer shell of the damping element is formed directly on the polymer gel, while the latter already has the desired geometrical configuration, homogeneous envelope and perfectly distributed on the outer surface on the dispersion has been sprayed, deposited or projected.
  • the spraying or spraying of the crosslinkable dispersion occurs while the polymer constituting the compact block is not yet fully crosslinked. This gives a better adhesion between the film and the block, after crosslinking of the two polymers respectively of the block and the film.
  • the formation of the film on all or part of the outer surface of the block can be done by spraying with nozzle or air-less type gun, or by projection of the curtain type, or even by a simple deposit with the aid of 'a brush.
  • the polymer of the crosslinkable dispersion is chosen so that the film obtained after crosslinking is smooth, with a feel that is neither greasy nor sticky, and can provide the gel block with improved mechanical strength.
  • the compact block can take all kinds of geometric configuration, for example cubic, parallelepipedic, frustoconical, pyramidal, cylindrical. It may be a solid block or a block having an inner recess. This latter version has the advantage of obtaining, during compression of the block, a double creep of the gel, outwards and towards the inner recess.
  • the spraying, depositing or spraying of the crosslinkable dispersion also occurs on the surface of the inner recess.
  • This damping element can be implemented in particular in a damping device serving as a support for the object to be protected from shocks and vibrations.
  • the damping element may have an adhering upper face intended to support the object to be protected from shocks and an adhering lower face serving as a bearing face of the device on, for example, a table, a piece of furniture or generally a structural part.
  • the adherent faces have a tack, that is to say an adhesive capacity, sufficient to ensure the stability of the object relative to the structural part, or the holding in position of the damping element between the object and the structural part.
  • the damping element can be used for the protection of two glass plates during their transport, one of the plates acting as object to be protected and the other of structural part.
  • the damping element is arranged between a support element and a support element, the support element acting as support for the object to be protected and the support element enabling the support of the device on a structural part.
  • the support element and / or the support element comprises an insert which is included in the compact block of polymer gel during the formation thereof, which makes it possible to obtain a mechanically resistant assembly.
  • the support element and / or the support element may consist of a fixing head, in particular a threaded rod, extending said insert out of the compact block.
  • the object to be protected also includes fastening means capable of cooperating with the fixing head, for example a tapped hole.
  • the support element and / or the support element is a support plate and / or a support plate coming into contact with a flat face of the compact block.
  • the spraying, the deposition or the projection of the crosslinkable dispersion can be done on the whole surface of the block or, in the latter case, it can not only on the apparent surface of the block after it has been placed between the support plate and the support plate.
  • the damping element is integral with the support plates and support. To do this it is possible to apply a layer of binder previously on the contact areas between said plates and the gel block.
  • this binder layer may be constituted by the same crosslinkable dispersion as that used for the formation of the film on the apparent surface of the block.
  • a layer of the crosslinkable dispersion is deposited on the backing plate, at least at the level of the contact zone, the block of gel is deposited on said zone, spraying, depositing or spraying the crosslinkable dispersion over the entire visible surface of the elastomer block, then applying the support plate to said block. It is then sufficient to wait until the polymer thus deposited reticle, which on the one hand creates a bond between the block polymer and each of the two plates and on the other hand forms, on the apparent surface of the gel block, a film acting as an envelope.
  • the compact block of polymer gel has, in vertical section, the shape of an isosceles trapezium, each of the two elements, in particular plates, support and support, being in connection with one of two bases of said trapeze.
  • This particular structural feature is intended to allow the gel block to deform under better conditions on the occasion of a mechanical effect comparable to a shock, in particular due to the acceleration on takeoff of an aircraft or to the impact when landing. If the cross section of the gel block was simply rectangular, the deformation of said block would result in a lateral bending whose vertex would be at the median plane of the gel block, with a risk of rupture of the film constituting the envelope of the block in case of excessive deformation. Because of the section trapezoidal, the deformation results in a filling of the volume surrounding the block near the small base of the trapezium, possibly with a contact of the film on the adjacent plate, which minimizes the risk of tearing said film.
  • the compact block may have a configuration having a central axis of symmetry, for example frustoconical, pyramidal or regular, or a central plane of symmetry with a longitudinal structure
  • the damping device comprises two longitudinal blocks of polymer gel, which are distant from each other and whose general direction is parallel.
  • a damping device comprising a support element, a support element and, between said two elements at least one gel block of polymer, integral with said two elements and whose apparent surface is covered with a film obtained by spraying, deposition or spraying of a crosslinkable dispersion, illustrated by the appended drawing in which:
  • FIG. 1 is a schematic representation in perspective of the mold making it possible to form a compact block of gel having a configuration of trapezoidal section
  • FIG. 2 is a schematic sectional representation of a first example of a damping device comprising two compact blocks of gel obtained with the mold of Figure 1.
  • Figure 3 is a sectional representation of a second example of a damping device comprising two support and support elements, with inserts included in the compact block.
  • the damping device of the present invention aims particularly but not exclusively to meet these constraints required by the aeronautics.
  • the device lselon the first example, as shown in Figure 2, comprises a support plate 2, a support plate 3 and, arranged between the two said plates 2, 3, two damping elements 4, 4 '.
  • Each damping element 4 comprises on the one hand a compact block 5 of a polymer gel, in particular elastomer, and on the other hand an outer film 6 which covers the compact block 5 on at least the apparent surface of said block 5 when it is positioned between the two plates 2, 3 as illustrated in FIG. 2.
  • the outer film may also cover the compact block over its entire surface, especially when the polymer of the crosslinkable dispersion is used, as a cohesive agent with the support and / or support plate.
  • the compact block 5 has a longitudinal and pyramidal shape, whose cross section is an isosceles trapezium.
  • the upper face 5a of the compact block 5 corresponds to the small base of the trapezium, while the lower face 5b corresponds to the large base of the trapezium.
  • the preparation of the compact block 5 is done simply by means of a mold 7 having internally the exact geometrical configuration of the compact block 5, as illustrated in FIG. 1. It is introduced into this mold 7, after having them mixed and optionally degassed, the components for obtaining, after crosslinking, a compact gel of polymer, especially silicone. After crosslinking, the compact block 5 is demolded. It may be desirable to perform some preparation of the backing plate in order to obtain good adhesion with the compact block, either surface preparation of the sandblasting type or preparation using a binder or a binder. primer 8.
  • the two compact blocks 5, 5 'are arranged on the plate 3 thus prepared so that their bottom faces 5b, 5b' are in contact with the contact zones 3a, 3'a on which deposited the binder layer 8 or primer. During this placement, the two compact blocks 5, 5 'are arranged so that they are parallel to one another.
  • a dispersion of a crosslinkable polymer is then sprayed on the entire apparent surface of the two compact blocks 5, 5 ', namely the upper faces 5a, 5'a but also all the lateral faces. 9, 9 'so as to form, after crosslinking, a film 10 constituting the envelope of the damping element 4, 4'.
  • the two damping elements 4, 4 ' are deposited on the support plate 2, the bottom face 2a of which has optionally been subjected to a sanding treatment.
  • a damping device 1 has thus been obtained in which the damping elements 4, 4 'adhere to the two plates 2, 3 and are surrounded by a protective film 10, which acts as an envelope with reference to the known cushion-type structure.
  • the device 11 of the second example, illustrated in FIG. 3, comprises a support element 12 and a support element 13 which are partly inserted in the damping element 14. More specifically, the support element 13 consists of a threaded rod 12a which is extended by an insert 12b, included inside the compact block 15 of the damping element 14; likewise for the support element 13 with the threaded rod 13a and the insert 13b.
  • the polymer gel of the compact block must of course have the desirable characteristics to act as a damping material.
  • Spraying, depositing or spraying of the dispersion is preferably carried out while the crosslinking of the polymer gel is not yet fully achieved.
  • the crosslinkable dispersion may be of the cold-crosslinkable type, for example as regards a spray in contact with ambient humidity, or a heat-crosslinkable agent.

Abstract

The inventive method for producing a damping member (4) having a specified geometrical configuration consists a) in forming a compact gel unit (5) having said geometrical configuration by moulding, shaping, cutting-off or another appropriate means and b) in forming a polymer film (10) through the part or the entire external surface of said unit (5) by spraying or projecting and cross linking a crosslinkable dispersion of said polymer. In order to produce a damping device (1) for supporting a object (11) to be protected against impacts and vibration, wherein the damping member (4) is disposed between a supporting member used as a support (2) for the protected object (11) and a bearing member (3), the spraying or projection of the crosslinkable polymer dispersion is carried out on the apparent surface of the unit after the unit is mounted on the bearing member (3) or, possibly, between said bearing member (3) and the supporting member (2).

Description

PROCEDE DE FABRICATION D'UN ELEMENT AMORTISSEUR. ELEMENT METHOD FOR MANUFACTURING A SHOCK. ELEMENT
AMORTISSEUR OBTENU PAR LE PROCEDE ET DISPOSITIFDAMPER OBTAINED BY THE METHOD AND DEVICE
AMORTISSEUR METTANT EN ŒUVRE LEDIT ELEMENTDAMPER IMPLEMENTING SAID ELEMENT
La présente invention concerne le domaine de l'amortissement des chocs et/ou des vibrations mécaniques. Elle concerne plus particulièrement un élément amortisseur comprenant un gel , son procédé de fabrication et un dispositif le mettant en œuvre.The present invention relates to the field of damping shocks and / or mechanical vibrations. It relates more particularly to a damping element comprising a gel, its manufacturing method and a device implementing it.
Les problèmes d'amortissement de chocs et/ou de vibrations mécaniques se posent dans de multiples aspects de la vie moderne. A titre d'exemple et de manière non exclusive , se pose , dans le domaine de l'aéronautique , le problème de la protection du matériel électronique et informatique - notamment le disque dur - embarqué à bord d'un avion du fait des effets mécaniques inhérents à l'utilisation de cet avion , effets mécaniques du type vibrations et également du type chocs , dus à l'impact lors de l'atterrissage ou à l'accélération lors du décollage. Ces problèmes sont d'autant plus importants qu'il s'agit de matériels électroniques ou informatiques sophistiqués équipant notamment des avions stratégiques.The problems of damping shocks and / or mechanical vibrations arise in many aspects of modern life. By way of example and in a non exclusive way, arises in the field of aeronautics, the problem of the protection of electronic and computer equipment - including the hard disk - boarded an aircraft because of mechanical effects inherent to the use of this aircraft, mechanical effects of the vibration type and also the shock type, due to the impact during landing or acceleration during takeoff. These problems are all the more important that it is sophisticated electronic or computer equipment equipping including strategic aircraft.
Parmi les différents moyens amortisseurs qui ont été développés , on connaît les structures du type coussins , qui comprennent une enveloppe à l'intérieur de laquelle est logé un matériau amortisseur . De manière générale , l'enveloppe est réalisée sous la forme d'un film mince d'un matériau à fort coefficient d'allongement et grande élasticité , tandis que le matériau amortisseur est choisi pour que son fluage varie avec la pression exercée. Il est notamment connu d'utiliser comme enveloppe un matériau du type polyuréthanne thermoplastique et comme matériau amortisseur un gel de silicone ou assimilé.Among the different damping means that have been developed, cushion-type structures are known, which comprise an envelope inside which damping material is housed. In general, the envelope is made in the form of a thin film of a material with a high coefficient of elongation and high elasticity, while the damping material is chosen so that its creep varies with the pressure exerted. It is in particular known to use a thermoplastic polyurethane material as the casing and as a damping material a silicone gel or the like.
Dans le document FR.A.2.741.683, on explique précisément la technique de fabrication d'un élément amortisseur de type coussin. Il s'agit tout d'abord de confectionner l'enveloppe dans la géométrie souhaitable en laissant une ouverture permettant ensuite d'introduire dans cette enveloppe le mélange de deux composants dans des conditions permettant leur réticulation sous forme d'un gel. Il s'agit ensuite de refermer l'enveloppe afin d'en assurer l'étanchéité. Dans l'exemple décrit et illustré dans le document FR.A.2.741.683, l'élément amortisseur se présente comme un étui à l'intérieur duquel peut être logé l'objet à protéger. Cet étui a globalement la forme d'un parallélépipède rectangle. Cette réalisation nécessite la confection , à partir d'un film mince , d'une première enveloppe extérieure et d'une seconde enveloppe intérieure , l'utilisation de gabarits permettant le maintien en forme de ces deux enveloppes pendant l'introduction dans l'espace libre entre les deux dites enveloppes du mélange bi- composant, puis l'obturation de l'ouverture entre les deux enveloppes après réticulation du gel. En tout état de cause , cette technique de fabrication qui est déjà fort délicate pour une configuration géométrique assez simple , interdit d'envisager des formes géométriques beaucoup plus complexes pour l'élément amortisseur.In FR.A.2.741.683, it explains precisely the technique of manufacturing a cushion-type damping element. It is first of all to make the envelope in the desirable geometry leaving an opening then allowing to introduce into this envelope the mixture of two components under conditions allowing their crosslinking in the form of a gel. It is then a question of closing the envelope in order to seal it. In the example described and illustrated in the document FR.A.2.741.683, the damping element is in the form of a case inside which the object to be protected can be housed. This case has the overall shape of a rectangular parallelepiped. This embodiment requires the making, from a thin film, of a first outer envelope and a second inner envelope, the use of templates for maintaining the shape of these two envelopes during the introduction into space free between the two said envelopes of the two-component mixture, and then closing the opening between the two envelopes after crosslinking of the gel. In any case, this manufacturing technique which is already very difficult for a fairly simple geometric configuration, prohibits to consider much more complex geometric shapes for the damping element.
Cet inconvénient n'existe pas dans les éléments amortisseurs du type mousse qui peuvent être ajustés , par découpage , aux formes de l'objet à protéger.This disadvantage does not exist in the foam-type damping elements which can be adjusted, by cutting, to the shapes of the object to be protected.
Dans le document FR.2.831.235, on a déjà cherché à combiner , dans le même élément amortisseur , l'avantage de la technique de fabrication mettant en œuvre de la mousse et l'avantage de la structure coussin. Selon ce document , l'élément amortisseur comprend une mousse à cavités ouvertes et , injecté dans lesdites cavités , un second matériau apte à se déformer élastiquement dans lesdites cavités ouvertes lors d'un choc mécanique et/ou d'une pression exercée sur ledit élément. Il est également prévu que cet élément amortisseur puisse comprendre une enveloppe extérieure permettant d'augmenter sa résistance mécanique et d'éviter le contact de la mousse et de l'autre matériau avec l'objet à protéger . Cette enveloppe n'est pas nécessairement étanche ni adaptée parfaitement à la configuration de son contenu.In the document FR.2.831.235, it has already been sought to combine, in the same damping element, the advantage of the manufacturing technique using foam and the advantage of the cushion structure. According to this document, the damping element comprises a foam with open cavities and, injected into said cavities, a second material capable of elastically deforming in said open cavities during a mechanical impact and / or pressure exerted on said element. . It is also expected that this damping element may comprise an outer casing to increase its mechanical strength and prevent contact of the foam and the other material with the object to be protected. This envelope is not necessarily waterproof or perfectly adapted to the configuration of its contents.
Le premier objet de la présente invention est de proposer une technique de fabrication simplifiée pour un élément amortisseur du type coussin , sans qu'il soit nécessaire d'utiliser une mousse comme dans le document FR.2.831.235. De manière caractéristique , selon la présente invention , le procédé de fabrication d'un élément amortisseur ayant une configuration géométrique donnée, consiste : a) à former par moulage, empreinte, découpage ou tout autre moyen approprié un bloc compact d'un gel de polymère ayant ladite configuration géométrique et b) à former sur tout ou partie de la surface extérieure dudit bloc un film de polymère par pulvérisation, dépôt ou projection et par réticulation d'une dispersion réticulable dudit polymère. Ainsi , selon la disposition particulière de la présente invention, l'enveloppe extérieure de l'élément amortisseur est formée directement sur le gel de polymère alors que celui-ci a déjà la configuration géométrique souhaitée, enveloppe homogène et parfaitement répartie sur la surface extérieure sur laquelle la dispersion a été pulvérisée , déposée ou projetée. De préférence la pulvérisation ou la projection de la dispersion réticulable intervient alors que le polymère constitutif du bloc compact n'est pas encore totalement réticulé. On obtient ainsi un meilleur accrochage entre le film et le bloc, après réticulation des deux polymères respectivement du bloc et du film.The first object of the present invention is to provide a simplified manufacturing technique for a cushion-type cushioning element, without the need to use a foam as in document FR.2.831.235. Typically, according to the present invention, the method of manufacturing a damping element having a given geometrical configuration consists of: a) forming by molding, imprinting, cutting or any other suitable means a compact block of a polymer gel having said geometric configuration and b) forming on all or part of the outer surface of said block a polymer film by spraying, depositing or spraying and crosslinking a crosslinkable dispersion of said polymer. Thus, according to the particular arrangement of the present invention, the outer shell of the damping element is formed directly on the polymer gel, while the latter already has the desired geometrical configuration, homogeneous envelope and perfectly distributed on the outer surface on the dispersion has been sprayed, deposited or projected. Preferably the spraying or spraying of the crosslinkable dispersion occurs while the polymer constituting the compact block is not yet fully crosslinked. This gives a better adhesion between the film and the block, after crosslinking of the two polymers respectively of the block and the film.
La formation du film sur tout ou partie de la surface extérieure du bloc peut se faire par pulvérisation à l'aide de buse ou pistolet type air-less, ou par projection du type rideau, ou même par un simple dépôt à l'aide d'un pinceau.The formation of the film on all or part of the outer surface of the block can be done by spraying with nozzle or air-less type gun, or by projection of the curtain type, or even by a simple deposit with the aid of 'a brush.
Le polymère de la dispersion réticulable est choisi pour que le film obtenu après réticulation soit lisse , avec un toucher qui ne soit ni gras ni collant , et puisse apporter au bloc de gel une résistance mécanique améliorée. Le bloc compact peut prendre toutes sortes de configuration géométrique, par exemple cubique , parallélépipédique , tronconique , pyramidale, cylindrique. Il peut s'agir d'un bloc plein ou d'un bloc présentant un évidement intérieur. Cette dernière version présente l'avantage d'obtenir , lors de la compression du bloc, un double fluage du gel , vers l'extérieur et vers l'évidement intérieur. Avantageusement, la pulvérisation , le dépôt ou la projection de la dispersion réticulable intervient également sur la surface de l'évidement intérieur. Cet élément amortisseur peut être mis en œuvre en particulier dans un dispositif amortisseur servant de support à l'objet à protéger des chocs et des vibrations.The polymer of the crosslinkable dispersion is chosen so that the film obtained after crosslinking is smooth, with a feel that is neither greasy nor sticky, and can provide the gel block with improved mechanical strength. The compact block can take all kinds of geometric configuration, for example cubic, parallelepipedic, frustoconical, pyramidal, cylindrical. It may be a solid block or a block having an inner recess. This latter version has the advantage of obtaining, during compression of the block, a double creep of the gel, outwards and towards the inner recess. Advantageously, the spraying, depositing or spraying of the crosslinkable dispersion also occurs on the surface of the inner recess. This damping element can be implemented in particular in a damping device serving as a support for the object to be protected from shocks and vibrations.
Dans un tel dispositif amortisseur, l'élément amortisseur peut présenter une face supérieure adhérente destinée à supporter l'objet à protéger des chocs et une face inférieure adhérente servant de face d'appui du dispositif sur , par exemple, une table, un meuble ou de manière générale une pièce de structure . Les faces adhérentes , présentent un tack, c'est-à-dire une capacité adhésive, suffisante pour assurer la stabilité de l'objet par rapport à la pièce de structure , ou encore le maintien en position de l'élément amortisseur entre l'objet et la pièce de structure. Dans un cas particulier d'utilisation, l'élément amortisseur peut servir à la protection de deux plaques de verre lors de leur transport, l'une des plaques faisant office d'objet à protéger et l'autre de pièce de structure.In such a damping device, the damping element may have an adhering upper face intended to support the object to be protected from shocks and an adhering lower face serving as a bearing face of the device on, for example, a table, a piece of furniture or generally a structural part. The adherent faces have a tack, that is to say an adhesive capacity, sufficient to ensure the stability of the object relative to the structural part, or the holding in position of the damping element between the object and the structural part. In a particular case of use, the damping element can be used for the protection of two glass plates during their transport, one of the plates acting as object to be protected and the other of structural part.
Dans un dispositif amortisseur d'un autre type , l'élément amortisseur est disposé entre un élément de support et un élément d'appui , l'élément support faisant office de support de l'objet à protéger et l'élément d'appui permettant l'appui du dispositif sur une pièce de structure.In a damping device of another type, the damping element is arranged between a support element and a support element, the support element acting as support for the object to be protected and the support element enabling the support of the device on a structural part.
Dans une variante de réalisation, l'élément de support et/ou l'élément d'appui comporte un insert qui est inclus dans le bloc compact de gel de polymère lors de la formation de celui-ci, ce qui permet d'obtenir un ensemble mécaniquement résistant. Par exemple l'élément de support et/ou l'élément d'appui peut être constitué d'une tête de fixation , notamment une tige filetée , prolongeant, hors du bloc compact, ledit insert. Bien sûr l'objet à protéger comporte, lui aussi, des moyens de fixation aptes à coopérer avec la tête de fixation, par exemple un trou taraudé.In an alternative embodiment, the support element and / or the support element comprises an insert which is included in the compact block of polymer gel during the formation thereof, which makes it possible to obtain a mechanically resistant assembly. For example, the support element and / or the support element may consist of a fixing head, in particular a threaded rod, extending said insert out of the compact block. Of course the object to be protected also includes fastening means capable of cooperating with the fixing head, for example a tapped hole.
Dans une variante de réalisation, l'élément support et/ou l'élément d'appui est une plaque support et/ou une plaque d'appui venant en contact avec une face plane du bloc compact.In an alternative embodiment, the support element and / or the support element is a support plate and / or a support plate coming into contact with a flat face of the compact block.
La pulvérisation, le dépôt ou la projection de la dispersion réticulable peut se faire sur toute la surface du bloc ou bien, dans ce dernier cas, elle peut ne se faire que sur la surface apparente du bloc , après que celui-ci ait été mis en place entre la plaque d'appui et la plaque support.The spraying, the deposition or the projection of the crosslinkable dispersion can be done on the whole surface of the block or, in the latter case, it can not only on the apparent surface of the block after it has been placed between the support plate and the support plate.
Cependant il est souhaitable que l'élément amortisseur soit solidaire des plaques d'appui et de support. Pour ce faire il est possible d'appliquer une couche de liant préalablement sur les zones de contact entre lesdites plaques et le bloc de gel.However it is desirable that the damping element is integral with the support plates and support. To do this it is possible to apply a layer of binder previously on the contact areas between said plates and the gel block.
Eventuellement cette couche de liant peut être constituée par la même dispersion réticulable que celle utilisée pour la formation du film sur la surface apparente du bloc. Dans ce cas , on procède tout d'abord au dépôt d'une couche de la dispersion réticulable sur la plaque d'appui, au moins au niveau de la zone de contact , on dépose sur ladite zone le bloc de gel, on procède à la pulvérisation, au dépôt ou à la projection de la dispersion réticulable sur l'ensemble de la surface apparente du bloc d'élastomère puis on applique sur ledit bloc la plaque support. Il suffit ensuite d'attendre que le polymère ainsi déposé réticule, ce qui d'une part crée une liaison entre le polymère du bloc et chacune des deux plaques et d'autre part forme , sur la surface apparente du bloc de gel , un film faisant office d'enveloppe. Eventuellement , si nécessaire , il est possible de procéder à une ou plusieurs pulvérisations , dépôts ou projections complémentaires sur la surface apparente du bloc entre les deux plaques en fonction de la résistance mécanique souhaitée pour le film.Optionally this binder layer may be constituted by the same crosslinkable dispersion as that used for the formation of the film on the apparent surface of the block. In this case, first of all, a layer of the crosslinkable dispersion is deposited on the backing plate, at least at the level of the contact zone, the block of gel is deposited on said zone, spraying, depositing or spraying the crosslinkable dispersion over the entire visible surface of the elastomer block, then applying the support plate to said block. It is then sufficient to wait until the polymer thus deposited reticle, which on the one hand creates a bond between the block polymer and each of the two plates and on the other hand forms, on the apparent surface of the gel block, a film acting as an envelope. Optionally, if necessary, it is possible to carry out one or more sprays, deposits or additional projections on the apparent surface of the block between the two plates depending on the desired mechanical strength for the film.
Dans une variante de réalisation, le bloc compact de gel de polymère a , en section verticale , la forme d'un trapèze isocèle, chacun des deux éléments, notamment plaques, d'appui et de support, étant en liaison avec l'une des deux bases dudit trapèze. Cette caractéristique structurelle particulière a pour but de permettre au bloc de gel de se déformer dans de meilleures conditions à l'occasion d'un effet mécanique assimilable à un choc , notamment dû à l'accélération au décollage d'un avion ou à l'impact lors de son atterrissage. Si la section transversale du bloc de gel était simplement rectangulaire , la déformation dudit bloc se traduirait par un bombage latéral dont le sommet se trouverait au niveau du plan médian du bloc de gel , avec un risque de rupture du film constituant l'enveloppe du bloc en cas de déformation trop importante. Du fait de la section trapézoïdale , la déformation se traduit par un remplissage du volume entourant le bloc à proximité de la petite base du trapèze, avec éventuellement un contact du film sur la plaque adjacente , ce qui minimise les risques de déchirure dudit film.In an alternative embodiment, the compact block of polymer gel has, in vertical section, the shape of an isosceles trapezium, each of the two elements, in particular plates, support and support, being in connection with one of two bases of said trapeze. This particular structural feature is intended to allow the gel block to deform under better conditions on the occasion of a mechanical effect comparable to a shock, in particular due to the acceleration on takeoff of an aircraft or to the impact when landing. If the cross section of the gel block was simply rectangular, the deformation of said block would result in a lateral bending whose vertex would be at the median plane of the gel block, with a risk of rupture of the film constituting the envelope of the block in case of excessive deformation. Because of the section trapezoidal, the deformation results in a filling of the volume surrounding the block near the small base of the trapezium, possibly with a contact of the film on the adjacent plate, which minimizes the risk of tearing said film.
Dans sa forme en section de trapèze isocèle , le bloc compact peut avoir une configuration ayant un axe central de symétrie , par exemple tronconique, pyramidale ou régulière ou encore un plan central de symétrie avec une structure longitudinaleIn its isosceles trapezoidal section shape, the compact block may have a configuration having a central axis of symmetry, for example frustoconical, pyramidal or regular, or a central plane of symmetry with a longitudinal structure
Dans un mode particulier de réalisation, le dispositif amortisseur comporte deux blocs longitudinaux de gel de polymère , qui sont distants l'un de l'autre et dont la direction générale est parallèle.In a particular embodiment, the damping device comprises two longitudinal blocks of polymer gel, which are distant from each other and whose general direction is parallel.
La présente invention sera mieux comprise à la lecture de la description qui va être faite d'exemples de réalisation d'un dispositif amortisseur comprenant un élément d'appui , un élément support et, entre les deux dits éléments au moins un bloc de gel de polymère , solidaire des deux dits éléments et dont la surface apparente est recouverte d'un film obtenu par pulvérisation, dépôt ou projection d'une dispersion réticulable, illustrés par le dessin annexé dans lequel :The present invention will be better understood on reading the description which will be made of exemplary embodiments of a damping device comprising a support element, a support element and, between said two elements at least one gel block of polymer, integral with said two elements and whose apparent surface is covered with a film obtained by spraying, deposition or spraying of a crosslinkable dispersion, illustrated by the appended drawing in which:
La figure 1 est une représentation schématique en perspective du moule permettant de former un bloc compact de gel ayant une configuration de section trapézoïdale et La figure 2 est une représentation schématique en coupe d'un premier exemple de dispositif amortisseur comportant deux blocs compacts de gel obtenus avec le moule de la figure 1.FIG. 1 is a schematic representation in perspective of the mold making it possible to form a compact block of gel having a configuration of trapezoidal section and FIG. 2 is a schematic sectional representation of a first example of a damping device comprising two compact blocks of gel obtained with the mold of Figure 1.
La figure 3 est une représentation en coupe d'un deuxième exemple de dispositif amortisseur comportant deux éléments de support et d'appui , avec inserts inclus dans le bloc compact.Figure 3 is a sectional representation of a second example of a damping device comprising two support and support elements, with inserts included in the compact block.
Dans le domaine de l'aéronautique les constructeurs sont de plus en plus exigeants en matière de protection des matériels électroniques ou informatiques vis-à-vis des vibrations et des chocs qui peuvent se produire dans toutes les phases de vol , notamment la phase d'atterrissage où les chocs lors de l'impact au sol peuvent être violents. Il est en effet quasiment vital que les matériels électroniques ou informatiques notamment le disque dur qui sont embarqués ne soient pas endommagés au cours du vol.In the field of aeronautics, manufacturers are increasingly demanding in terms of the protection of electronic or computer equipment against vibrations and shocks that may occur in all phases of flight, particularly the phase of flight. landing where shocks during ground impact may be violent. It is indeed almost vital that the materials electronic or computer including embedded hard drive are not damaged during the flight.
Le dispositif amortisseur de la présente invention vise notamment mais non exclusivement à répondre à ces contraintes exigées par l'aéronautique. Le dispositif lselon le premier exemple, tel qu'illustré à la figure 2 , comporte une plaque support 2 , une plaque d'appui 3 et , disposés entre les deux dites plaques 2, 3 , deux éléments amortisseurs 4, 4'.The damping device of the present invention aims particularly but not exclusively to meet these constraints required by the aeronautics. The device lselon the first example, as shown in Figure 2, comprises a support plate 2, a support plate 3 and, arranged between the two said plates 2, 3, two damping elements 4, 4 '.
Chaque élément amortisseur 4 comporte d'une part un bloc compact 5 d'un gel de polymère , notamment d'élastomère, et d'autre part un film extérieur 6 qui recouvre le bloc compact 5 sur au moins la surface apparente dudit bloc 5 lorsqu'il est positionné entre les deux plaques 2, 3 comme illustré à la figure 2. En pratique, le film extérieur peut aussi recouvrir le bloc compact sur l'intégralité de sa surface, notamment lorsqu'on utilise le polymère de la dispersion réticulable , comme agent de cohésion avec la plaque de support et/ou d'appui. Dans l'exemple illustré, le bloc compact 5 a une forme longitudinale et pyramidale , dont la section transversale se présente comme un trapèze isocèle. La face supérieure 5a du bloc compact 5 correspond à la petite base du trapèze , tandis que la face inférieure 5b correspond à la grande base du trapèze.Each damping element 4 comprises on the one hand a compact block 5 of a polymer gel, in particular elastomer, and on the other hand an outer film 6 which covers the compact block 5 on at least the apparent surface of said block 5 when it is positioned between the two plates 2, 3 as illustrated in FIG. 2. In practice, the outer film may also cover the compact block over its entire surface, especially when the polymer of the crosslinkable dispersion is used, as a cohesive agent with the support and / or support plate. In the example shown, the compact block 5 has a longitudinal and pyramidal shape, whose cross section is an isosceles trapezium. The upper face 5a of the compact block 5 corresponds to the small base of the trapezium, while the lower face 5b corresponds to the large base of the trapezium.
La préparation du bloc compact 5 se fait tout simplement à l'aide d'un moule 7 présentant intérieurement l'exacte configuration géométrique du bloc compact 5 , telle qu'illustrée à la figure 1. On introduit dans ce moule 7, après les avoir mélangés et éventuellement dégazés, les composants permettant d'obtenir, après réticulation, un gel compact de polymère, notamment de silicone. Après réticulation , le bloc compact 5 est démoulé. II peut être souhaitable d'effectuer une certaine préparation de la plaque d'appui en vue d'obtenir une bonne adhésion avec le bloc compact, soit préparation de surface du type sablage soit préparation à l'aide d'un liant ou d'un primaire d'accrochage 8. On dispose sur la plaque 3 ainsi préparée les deux blocs compacts 5, 5' de telle sorte que leurs faces inférieures 5b, 5b' soient en contact avec les zones de contact 3a, 3'a sur lesquelles a été déposée la couche de liant 8 ou de primaire d'accrochage. Lors de ce placement , on dispose les deux blocs compacts 5, 5' de telle sorte qu'ils soient parallèles l'un à l'autre.The preparation of the compact block 5 is done simply by means of a mold 7 having internally the exact geometrical configuration of the compact block 5, as illustrated in FIG. 1. It is introduced into this mold 7, after having them mixed and optionally degassed, the components for obtaining, after crosslinking, a compact gel of polymer, especially silicone. After crosslinking, the compact block 5 is demolded. It may be desirable to perform some preparation of the backing plate in order to obtain good adhesion with the compact block, either surface preparation of the sandblasting type or preparation using a binder or a binder. primer 8. The two compact blocks 5, 5 'are arranged on the plate 3 thus prepared so that their bottom faces 5b, 5b' are in contact with the contact zones 3a, 3'a on which deposited the binder layer 8 or primer. During this placement, the two compact blocks 5, 5 'are arranged so that they are parallel to one another.
Dans l'exemple illustré , on réalise ensuite une pulvérisation d'une dispersion d'un polymère réticulable sur toute la surface apparente des deux blocs compacts 5 , 5', à savoir les faces supérieures 5a, 5'a mais également toutes les faces latérales 9, 9' en sorte de former , après réticulation ,un film 10 constituant l'enveloppe de l'élément amortisseur 4, 4'.In the illustrated example, a dispersion of a crosslinkable polymer is then sprayed on the entire apparent surface of the two compact blocks 5, 5 ', namely the upper faces 5a, 5'a but also all the lateral faces. 9, 9 'so as to form, after crosslinking, a film 10 constituting the envelope of the damping element 4, 4'.
Après cette pulvérisation et avant que n'intervienne la réticulation , on dépose sur les deux éléments amortisseurs 4, 4' la plaque support 2 , dont la face inférieure 2a a éventuellement fait l'objet d'un traitement de sablage.After this spraying and before the crosslinking occurs, the two damping elements 4, 4 'are deposited on the support plate 2, the bottom face 2a of which has optionally been subjected to a sanding treatment.
A l'issue de la réticulation , on obtient une adhésion entre l'élément amortisseur 4, 4 et la plaque support 2.At the end of the crosslinking, an adhesion between the damping element 4, 4 and the support plate 2 is obtained.
On a ainsi obtenu un dispositif amortisseur 1 dans lequel les éléments amortisseurs 4, 4' adhèrent aux deux plaques 2 , 3 et sont entourés d'un film protecteur IO , faisant office d'enveloppe en référence à la structure connue de type coussin.A damping device 1 has thus been obtained in which the damping elements 4, 4 'adhere to the two plates 2, 3 and are surrounded by a protective film 10, which acts as an envelope with reference to the known cushion-type structure.
En fonction de la résistance mécanique souhaitée pour ce film, il peut être nécessaire d'effectuer plusieurs pulvérisations successives pour obtenir un film de plus grande épaisseur. Le dispositif 11 du second exemple , illustré par la figure 3, comporte un élément support 12 et un élément d'appui 13 qui sont en partie insérés dans l'élément amortisseur 14. Plus précisément , l'élément support 13 consiste en une tige filetée 12a qui est prolongée par un insert 12b, inclus à l'intérieur du bloc compact 15 de l'élément amortisseur 14 ; de même , pour l'élément d'appui 13 avec la tige filetée 13a et l'insert 13b.Depending on the desired mechanical strength for this film, it may be necessary to perform several successive sprays to obtain a film of greater thickness. The device 11 of the second example, illustrated in FIG. 3, comprises a support element 12 and a support element 13 which are partly inserted in the damping element 14. More specifically, the support element 13 consists of a threaded rod 12a which is extended by an insert 12b, included inside the compact block 15 of the damping element 14; likewise for the support element 13 with the threaded rod 13a and the insert 13b.
Le gel de polymère du bloc compact doit bien sûr présenter les caractéristiques souhaitables pour faire office de matériau amortisseur. La pulvérisation, le dépôt ou la projection de la dispersion se pratique de préférence alors que la réticulation du gel de polymère n'est pas encore totalement réalisée. La dispersion réticulable peut être du type réticulable à froid, par exemple s'agissant d'une pulvérisation au contact de l'humidité ambiante , ou bien réticulable à chaud. The polymer gel of the compact block must of course have the desirable characteristics to act as a damping material. Spraying, depositing or spraying of the dispersion is preferably carried out while the crosslinking of the polymer gel is not yet fully achieved. The crosslinkable dispersion may be of the cold-crosslinkable type, for example as regards a spray in contact with ambient humidity, or a heat-crosslinkable agent.

Claims

REVENDICATIONS
1. Procédé de fabrication d'un élément amortisseur (4) ayant une configuration géométrique donnée, caractérisé en ce qu'il consiste : a) à former , par moulage, empreinte , découpage ou tout autre moyen approprié, un bloc compact (5) d'un gel ayant ladite configuration géométrique et b) à former sur tout ou partie de la surface extérieure dudit bloc (5) un film (10) de polymère par pulvérisation ou projection et réticulation d'une dispersion réticulable dudit polymère. A method of manufacturing a damping element (4) having a given geometrical configuration, characterized in that it comprises: a) forming, by molding, imprinting, cutting or any other suitable means, a compact block (5) a gel having said geometrical configuration and b) forming on all or part of the outer surface of said block (5) a polymer film (10) by spraying or spraying and crosslinking a crosslinkable dispersion of said polymer.
2. Procédé de fabrication d'un dispositif amortisseur (1) servant de support à un objet (11) à protéger des chocs et des vibrations, dans lequel l'élément amortisseur obtenu par le procédé de la revendication 1 est disposé entre un élément de support faisant office de support (2) de l'objet (11) à protéger et un élément d'appui (3), caractérisé en ce que la pulvérisation ou projection de la dispersion du polymère réticulable intervient sur la surface apparente du bloc , après que celui-ci ait été mis en place sur l'élément d'appui (3) ou éventuellement entre l'élément d'appui (3) et l'élément support (2). 2. A method of manufacturing a damping device (1) serving as a support for an object (11) to protect against shocks and vibrations, wherein the damping element obtained by the method of claim 1 is disposed between an element of support acting as support (2) for the object (11) to be protected and a support element (3), characterized in that the spraying or spraying of the dispersion of the crosslinkable polymer takes place on the apparent surface of the block, after that it has been placed on the support element (3) or possibly between the support element (3) and the support element (2).
3. Procédé selon la revendication 2 caractérisé en ce que l'élément support et/ou l'élément inférieur d'appui comporte un insert, inclus dans le bloc compact de gel de polymère lors de la formation de celui-ci. 3. Method according to claim 2 characterized in that the support member and / or the lower support element comprises an insert, included in the compact block of polymer gel during the formation thereof.
4.Procédé selon la revendication 3 caractérisé en ce que l'élément support et/ou l'élément inférieur d'appui comporte une portion d'ancrage incluse dans le bloc compact et une portion de fixation dépassant du bloc compact, par exemple une tige filetée.4.Procédé according to claim 3 characterized in that the support element and / or the lower support element comprises an anchoring portion included in the compact block and a fixing portion protruding from the compact block, for example a rod threaded.
5. Procédé selon la revendication 4 caractérisé en ce que l'élément support et/ou l'élément d'appui est une plaque en contact avec une face plane de l'élément amortisseur. 5. Method according to claim 4 characterized in that the support member and / or the support member is a plate in contact with a flat face of the damping element.
6. Procédé selon la revendication 5 caractérisé en ce que - préalablement au placement du bloc compact (5) entre les plaques (2, 3) - une couche de liant ou de primaire d'accrochage est appliquée au moins sur la plaque d'appui (3) et au moins sur la zone de contact entre ladite plaque et le bloc compact (5).6. Method according to claim 5 characterized in that - prior to the placement of the compact block (5) between the plates (2, 3) - a layer of binder or primer is applied at least on the plate support (3) and at least on the contact area between said plate and the compact block (5).
7.Procédé selon la revendication 6 caractérisé en ce que la couche de liant ou de primaire d'accrochage est constituée par la même dispersion réticulable de primaire d'accrochage que celle utilisée pour la formation du film d'élastomère (10) sur la surface apparente du bloc compact (5). 7.Procédé according to claim 6 characterized in that the layer of binder or primer is formed by the same crosslinkable dispersion primer that is used for the formation of the elastomer film (10) on the surface apparent compact block (5).
8. Dispositif amortisseur obtenu par le procédé de la revendication 1 caractérisé en ce que le bloc compact a une configuration tronconique, pyramidale , cylindrique , cubique ou parallélépipédique. 8. damping device obtained by the method of claim 1 characterized in that the compact block has a frustoconical, pyramidal, cylindrical, cubic or parallelepipedic configuration.
9.Dispositif selon la revendication 8 caractérisé en ce que le bloc compact comporte un évidement intérieur.9.Dispositif according to claim 8 characterized in that the compact block comprises an inner recess.
10. Dispositif selon l'une des revendications 8 ou 9 caractérisé en ce que le bloc compact comporte deux faces adhérentes , l'une de support et l'autre d'appui. 10. Device according to one of claims 8 or 9 characterized in that the compact block comprises two adherent faces, one support and the other support.
11. Dispositif amortisseur obtenu par le procédé de l'une des revendications11. damping device obtained by the method of one of the claims
5 à 7 caractérisé en ce que le bloc compact (5) de gel de polymère a , en section verticale , la forme d'un trapèze isocèle , chacune des deux plaques, d'appui (3) et de support (2), étant en contact avec l'une des deux bases (5b, 5a) dudit trapèze. 5 to 7 characterized in that the compact block (5) of polymer gel has, in vertical section, the shape of an isosceles trapezium, each of the two plates, support (3) and support (2), being in contact with one of the two bases (5b, 5a) of said trapezium.
12. Dispositif selon la revendication 11 caractérisé en ce qu'il comporte deux blocs compacts longitudinaux (5,50 de gel d'élastomère , qui sont distants l'un de l'autre et dont la direction générale est parallèle. 12. Device according to claim 11 characterized in that it comprises two longitudinal compact blocks (5.50 of elastomer gel, which are spaced apart from each other and whose general direction is parallel.
PCT/FR2005/001413 2004-08-03 2005-06-08 Method for producing a damping member, a damping member produced by said method and damping device using said member WO2006024710A1 (en)

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FR0408601A FR2874070B1 (en) 2004-08-03 2004-08-03 METHOD FOR MANUFACTURING A DAMPER ELEMENT, SHOCK ABSORBER ELEMENT OBTAINED BY THE METHOD, AND SHOCK ABSORBER DEVICE IMPLEMENTING SAID ELEMENT

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