EP2723518B1 - Machine and method for assembling a pattern for lost-pattern moulding, and corresponding moulding method - Google Patents

Machine and method for assembling a pattern for lost-pattern moulding, and corresponding moulding method Download PDF

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Publication number
EP2723518B1
EP2723518B1 EP12731068.8A EP12731068A EP2723518B1 EP 2723518 B1 EP2723518 B1 EP 2723518B1 EP 12731068 A EP12731068 A EP 12731068A EP 2723518 B1 EP2723518 B1 EP 2723518B1
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EP
European Patent Office
Prior art keywords
adhesive
bonding
strata
support
pattern
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.)
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Application number
EP12731068.8A
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German (de)
French (fr)
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EP2723518A2 (en
EP2723518B8 (en
Inventor
Mario Dufloux
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
GM Global Technology Operations LLC
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Application filed by Peugeot Citroen Automobiles SA, GM Global Technology Operations LLC filed Critical Peugeot Citroen Automobiles SA
Publication of EP2723518A2 publication Critical patent/EP2723518A2/en
Publication of EP2723518B1 publication Critical patent/EP2723518B1/en
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Publication of EP2723518B8 publication Critical patent/EP2723518B8/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts

Definitions

  • the present invention relates to a laminate bonding machine of a model for a lost pattern molding process.
  • the invention further relates to an assembly method comprising the use of the preceding machine and a molding method comprising assembly according to such a method.
  • the technology of the lost model molding process uses an intermediate called model for obtaining castings.
  • the model for example polystyrene, is destroyed during the implementation of such a method, that is to say that one "loses” the model to obtain the desired casting part.
  • the geometry of the desired casting part corresponds to the geometry of the lost model.
  • the lost pattern molding process is indifferently referred to as "lost pattern method" or "PMP".
  • the lost model can consist of an assembly of strata.
  • the lost models of cylinder heads of an internal combustion engine can be formed by the assembly of four or five layers.
  • the figure 1 shows a schematic view of an assembly of two layers 40 and 60 using a bonding tool 20.
  • This bonding tool 20 is conventionally composed of two supports 24 and 26 each carrying a stratum of the model, respectively 40 and 60. These two supports 24 and 26 are adapted to be moved towards one another in a gluing direction, here the vertical direction. The displacement of the two supports 24 and 26 towards each other allows the bonding of the layers 40 and 60 carried by the two supports.
  • the bonding joint is represented by a bold line referenced 22.
  • the figure 2 shows a profile view of a model 50 obtained after gluing assembly of the two layers 40 and 60.
  • Each stratum 40 or 60 composing the model is previously obtained by molding in an injection cavity. Each stratum 40 or 60 is therefore derived from a mold formed by two half-impressions.
  • the Figures 3A and 3B represent half-impressions 80 and 82 of the same mold for obtaining a stratum of a lost breech model.
  • the figures 1 and 2 show connection joints of mold half-impressions when obtaining the different strata 40 and 60. According to the figure 1 the stratum 40 thus has a connection joint 44 while the stratum 60 has a connection joint 66.
  • the layer may comprise variations related to the closing clearance of the half-impressions 80 and 82.
  • figure 4 shows a diagram of the assembly of the stratum 40 with a stratum 60 whose obtaining by molding has caused a variation of geometry along the connection joint 66. The consequences of this variation can lead to a bad match at the joint of collage of strata.
  • the figure 5 shows the creation of a leakage zone at the seam 22 between the bonding surface 46 of the stratum 40 and the corresponding bonding surface 64 of the stratum 60.
  • the figure 6 shows the bonding joint between the stratum 40 and the stratum 60 in the absence of leakage zone. After bonding all the strata, such variations can accumulate because of the stacking of the strata.
  • gluing tools or assembly machines by bonding layers, which provide a three-dimensional adjustment and prior to the respective position of the supports.
  • Such a three-dimensional adjustment is commonly referred to as "X, Y and Z adjustment".
  • Such an adjustment makes it possible to bring the shapes of the strata into conformity with the level of the bonding joint 22.
  • the seal can assume complex shapes and present, for example, inverse slopes.
  • the setting of the tools is performed, prior to gluing, with respect to a model lot. To take into account the dispersion with respect to subsequent batches, a new adjustment is made to adapt to the variations of the layers. This resumption of the settings for each lot makes it more difficult to obtain a lost model using such tools.
  • the right part of the model formed by the strata 40 and 60 can then be subjected to a compressive stress, that is to say to an excessive tightening, (represented by a "+”) of the bonding surfaces 46 and 64 then that the left part of the same model can be subjected to a tensile stress (represented by a "-”) after the bonding of the two layers.
  • a compressive stress that is to say to an excessive tightening, (represented by a "+") of the bonding surfaces 46 and 64 then that the left part of the same model can be subjected to a tensile stress (represented by a "-”) after the bonding of the two layers.
  • the self-centering members allow a clearance of -0.5 mm to +0.5 mm in at least one direction contained in the plane orthogonal to the gluing direction, preferably in all the directions contained in the plane. orthogonal to the gluing direction.
  • the machine comprises, in addition to the self-centering members, nominal adjustment members of a respective positioning of the first support and the second support in the plane orthogonal to the gluing direction.
  • the machine comprises a frame on which the first and second supports are mounted, the self-centering members being arranged only between the frame and one of the first support and the second support.
  • the first layer has a bonding surface intended to be bonded to a bonding surface of the second layer, the bonding surfaces of the first and second layers having slopes inclined at an angle greater than 10 °, preferably greater than 15 ° with respect to a plane orthogonal to the gluing direction.
  • the adhesive has a Brookfield viscosity of between 700 and 1800 mPa.s at the bonding temperature, preferably a viscosity Brookfield between 1000 and 1500 mPa.s, the bonding temperature being preferably between 110 ° C and 130 ° C.
  • the layers are obtained by injection of polystyrene into molds.
  • the invention further provides a lost model molding method comprising assembling a model for lost pattern casting according to the preceding method, the assembled model being preferably a cylinder head of an internal combustion engine.
  • the proposed machine comprises a first support 24 and a second support 26.
  • the first support 24 allows the support of a first layer 40 of the model 50
  • the second support 26 allows the support of a second layer 60 of the model 50.
  • the first and second supports 24 and 26 are adapted to be moved towards each other, in a gluing direction to glue the first and second layers 40 and 60 together.
  • the machine 20 further comprises self-centering members of the strata 40 and 60. This self-centering takes place during the assembly position of the strata 40 and 60.
  • the assembly position of the strata corresponds to the displacement of the first and second supports 24 and 26 towards each other to glue the layers together.
  • Self-centering is provided by the self-centering members which provide respective freedom of movement of the supports 24 and 26 between them in a plane orthogonal to the direction of bonding.
  • This freedom of movement allows a matching of strata without constraint (the matching corresponds to the English word "compliance").
  • the absence of stress prevents the deterioration of the layers of the model for example made of polystyrene which is a fragile material.
  • the self-centering members further ensure an automatic adjustment of the position of one of the two supports relative to the other to ensure a bonding of the layers 40 and 60 devoid of leakage area at the bonding joint 22.
  • the slopes of the bonding joint 22 correspond to slopes inclined relative to the plane orthogonal to the bonding direction of the layers.
  • the slopes in the bonding joint 22 correspond to corresponding slopes presented by the bonding surface 46 of the first layer 40 and by the bonding surface 64 of the second layer 60.
  • the slopes may be inclined at an angle greater than 10 ° or preferably greater than 15 °.
  • strata 40 and 60 are positioned by sliding the layers one over the other through the slopes as well as the entire geometry of the bonding joint 22. This sliding occurs when the first and second supports 24 and 26 arrive at the end of the race of their displacement towards each other according to the direction of collage.
  • the proposed machine allows a simple assembly independently of the possible variations of geometry of the layers.
  • the invention allows assembly by bonding strata of a lost model that is less complex and more accurate to variations within the same batch of strata and between different batches of strata.
  • the machine causes a decrease in the number of model rejects related to a bad bond.
  • the machine 20 Because of the presence of the self-centering members, the machine 20 itself provides the desired function which allows the matching of the layers subsequently supported by the supports 24 and 26. Thus the machine 20, that is, ie the bonding tooling, directly integrates the self-centering solution without special preparation of the strata to be glued, or setting specific to each stratum.
  • This machine 20 can be advantageously used in a method of assembling by bonding the layers of a PMP model.
  • the invention also relates to such a method of assembling by bonding layers of a PMP model, thereby obtaining the above advantages.
  • Such a method comprises the prior implementations of the first layer 40 and the second layer 60 of the model 50 on the first support 24 and the second support 26 respectively.
  • the machine 20 proposed can indeed be originally completely devoid of strata 40 and 60.
  • the proposed method then comprises providing a glue for assembling strata 40 and 60 at a gluing temperature.
  • the adhesive may for example be provided via a sizing mask (not shown) disposed between the first and second layers 40 and 60.
  • the bonding temperature is chosen according to the hot melt nature of the adhesive to obtain a viscosity glue that allows the sliding without stresses 40 and 60 layers on each other.
  • the glue used may have a Brookfield viscosity of between 700 and 1800 mPa.s at the bonding temperature.
  • the adhesive used has a Brookfield viscosity of between 1000 and 1500 mPa.s at the bonding temperature.
  • Such an adhesive corresponds, for example, to the adhesive sold under the name SWIFTHERM 607 by forbo adhesives and having a Brookfield viscosity of 1800 mPa.s at 100 ° C., 1250 mPa.s at 120 ° C. and 700 mPa.s at 140 ° C. ° C.
  • the bonding temperature is preferably between 110 ° C and 130 ° C, more particularly the bonding temperature may be 120 ° C. In general, the bonding temperature can be between 110 ° C. and 130 ° C.
  • the method then comprises bonding the first and second layers 40 and 60 by respective displacement of the supports 24 and 26 in the gluing direction.
  • the assembly machine and the assembly method are particularly advantageous for the strata obtained by injection into molds, such as the molds illustrated by the Figures 3A and 3B .
  • strata 40 and 60 may have dimensional variations at the connection joint 44 or 66, as previously mentioned.
  • These dimensional variations which are in the manufacturing tolerance range of the strata 40 and 60, are automatically taken into account by the proposed self-centering, which makes it possible to avoid the bonding of the layers with a zone of leak and an area of too much compression of the model.
  • the proposed self-centering avoids the accumulation of tolerances of each stratum because of their stacking.
  • the machine may comprise, in addition to the self-centering members, nominal adjustment members of a respective positioning of the first support and the second support in the plane orthogonal to the gluing direction.
  • the layers 40 and 60 can be obtained by injection of polystyrene.
  • SWIFTHERM 607 glue is particularly advantageous for the assembly of polystyrene layers according to the proposed method.
  • the assembly of the strata makes it possible to obtain a lost breech model as illustrated by FIG. figure 2 .
  • the invention further relates to a lost model molding method comprising the previous method of assembling the lost model.
  • the molding process preferably makes it possible to obtain an internal combustion engine cylinder head.
  • the use of rolling balls makes it possible to obtain a very sensitive self-centering mechanism by opposing only a minimum of friction.
  • the set of rolling balls can be likened to a "bed" of rolling balls.
  • An unbalanced bonding surface corresponds, for example, to a bonding surface having more slopes oriented to the right than slopes oriented to the left. Because of the greater number of right-hand slopes, the setting of the strata into position can tend, by reaction, to a left-to-left mapping.
  • the orientation of the pair of pushers 38 in two different directions in the same direction makes it possible to rebalance the matching of the strata 40 and 60 during their assembly.
  • the self-centering devices described with reference to the figure 7 allow a clearance of - 0.5mm to + 0.5mm in at least one direction contained in the plane orthogonal to the gluing direction. It is advantageous if the clearance from -0.5 mm to +0.5 mm is possible in all the directions contained in the plane orthogonal to the gluing direction.
  • the clearance allowed by the self-centering members is adapted to the maximum tolerance related to obtaining the layers by molding, in particular by molding in two half-injection impressions.
  • the self-centering members may comprise at least two pairs of spring plungers, each pair of spring plungers being oriented in two different directions of the plane orthogonal to the gluing direction.
  • the self-centering members are only arranged between the second support 26 and the frame (not shown). Thus no self-centering member is disposed between the first support 24 and the frame.
  • an intermediate support 28 may be provided between the self-centering members of the second support 26 and the frame. This intermediate support 28 allows in particular the nominal adjustment of a respective positioning of the first support and the second support in the plane orthogonal to the gluing direction. All formed by the support 26 and the intermediate support 28 corresponds to a deposition shaper because it is intended to be arranged in the lower part of the machine 20, when the gluing direction is vertical.
  • the figure 8 shows a perspective view of the support 24 of an assembly machine 20 according to another embodiment of the self-centering members.
  • the self-centering members are only arranged between the first support 24 and the frame.
  • an intermediate support 84 may be provided between the self-centering members of the first support 24 and the frame.
  • the use of the intermediate support 84 between the self-centering members of the first support 24 and the frame allows the nominal adjustment of the first and second supports in the plane orthogonal to the direction of bonding .
  • the assembly formed by the support 24 and the intermediate support 84 corresponds to a gripper shaper or gripper because it is intended to be arranged in the upper part of the machine 20, when the bonding direction is vertical.
  • Part of the self-centering members is formed by at least one axis 70 of self-centering.
  • the self-centering members comprise four self-centering pins 70 each arranged at a corner of the first support 24.
  • the figure 9 shows a sectional view, according to the hatched plane P, of the first support 24 and the intermediate support 84. This view corresponds to a section in the plane of the line L of the figure 8 .
  • the figure 9 cut the support 24 and the support 84 at the axis 70 of self-centering.
  • the Figures 10A and 10B show a perspective view and an exploded perspective view of the previous self-centering axis 70.
  • the axis 70 is composed of two sets of rolling balls. These two sets of balls 30 are each held by a cage 72. These sets of balls are also each trapped in a cavity delimited in part by the part 86. On one side the part 86 defines a cavity with the plate 74, and on the other hand, the part 86 defines a cavity with the washer 76. Each of the sets of balls 30 can to slide freely in the plane orthogonal to the gluing while being guided by the piece 86 on the one hand and one of the pieces among the plate 74 and the washer 76 on the other hand.
  • the part 86 is fixed to the intermediate support 84 by means of a nut 88 while the plate 74 and the washer 76 are secured to the first support 24, for example by means of screws 78.
  • the proposed axis 70 allows displacement in all directions contained in the plane orthogonal to the gluing direction.
  • the self-centering members further comprise a spring loaded plunger support at each corner of the support 24.
  • These four spring plunger supports are not visible in figure 8 .
  • Figures 11A and 11B shows a perspective view and an exploded perspective view of such a support 32 spring loaded.
  • the spring loaded pushers 38 are then received in bores of the support 32 of spring pushers.
  • the first support 24 comprises four pairs of spring plungers distributed in two different directions of the plane orthogonal to the bonding. Two pairs of spring plungers distributed in two different directions may suffice, as previously described with reference to the embodiment of the invention. figure 7 .
  • a greater number of pairs of pushers contributes to the stability of the machine 20. In all cases, for a pair of pushers oriented in the same direction, each push of the pair is preferably oriented in a different direction as previously described.
  • the spring pushers 38 may be chosen at least from the spring pushers 38 with balls or with fingers.
  • the Figures 12A and 12B show cross-sectional views of these two spring pusher embodiments.
  • the figure 12A shows a spring pusher 38 of diameter d1 with finger 34 of diameter d3. This finger plunger 34 allows for example a deflection w2 from 0 to 0.5 mm.
  • the figure 12B shows a spring plunger 38 of diameter d1 with ball 36 of diameter d2. This ball pusher 36 allows for example a deflection w1 from 0 to 0.5 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)

Description

La présente invention concerne une machine d'assemblage par collage de strates d'un modèle pour procédé de moulage à modèle perdu. L'invention concerne en outre un procédé d'assemblage comprenant l'utilisation de la machine précédente et un procédé de moulage comprenant l'assemblage selon un tel procédé.The present invention relates to a laminate bonding machine of a model for a lost pattern molding process. The invention further relates to an assembly method comprising the use of the preceding machine and a molding method comprising assembly according to such a method.

La technologie du procédé de moulage par modèle perdu utilise un intermédiaire appelé modèle pour l'obtention de pièces de fonderie. Le modèle, par exemple en polystyrène, est détruit lors de la mise en oeuvre d'un tel procédé, c'est-à-dire que l'on "perd" le modèle pour obtenir la pièce de fonderie désirée. Cependant, lors de ce procédé, la géométrie de la pièce de fonderie désirée correspond à la géométrie du modèle perdu. Dans la suite de ce document le procédé de moulage par modèle perdu est indifféremment désigné par les termes "procédé modèle perdu" ou "PMP". Le modèle perdu peut être constitué par un assemblage de strates. Ainsi, dans le domaine de l'automobile, les modèles perdus de culasses d'un moteur à combustion interne peuvent être formés par l'assemblage de quatre ou cinq strates.The technology of the lost model molding process uses an intermediate called model for obtaining castings. The model, for example polystyrene, is destroyed during the implementation of such a method, that is to say that one "loses" the model to obtain the desired casting part. However, during this process, the geometry of the desired casting part corresponds to the geometry of the lost model. In the remainder of this document the lost pattern molding process is indifferently referred to as "lost pattern method" or "PMP". The lost model can consist of an assembly of strata. Thus, in the field of the automobile, the lost models of cylinder heads of an internal combustion engine can be formed by the assembly of four or five layers.

Ces strates sont assemblées par collage. Le collage des différentes strates constituant le modèle peut être réalisé à l'aide d'outillages de collage. La figure 1 montre une vue schématique d'un assemblage de deux strates 40 et 60 à l'aide d'un outillage de collage 20. Cet outillage de collage 20 se compose classiquement de deux supports 24 et 26 portant chacun une strate du modèle, respectivement 40 et 60. Ces deux supports 24 et 26 sont adaptés à être déplacés l'un vers l'autre dans une direction de collage, ici la direction verticale. Le déplacement des deux supports 24 et 26 l'un vers l'autre permet le collage des strates 40 et 60 portées par les deux supports. Le joint de collage est représenté par un trait gras référencé 22.These layers are assembled by gluing. The bonding of the different layers constituting the model can be achieved using bonding tools. The figure 1 shows a schematic view of an assembly of two layers 40 and 60 using a bonding tool 20. This bonding tool 20 is conventionally composed of two supports 24 and 26 each carrying a stratum of the model, respectively 40 and 60. These two supports 24 and 26 are adapted to be moved towards one another in a gluing direction, here the vertical direction. The displacement of the two supports 24 and 26 towards each other allows the bonding of the layers 40 and 60 carried by the two supports. The bonding joint is represented by a bold line referenced 22.

La figure 2 montre une vue de profil d'un modèle 50 obtenu après assemblage par collage des deux strates 40 et 60.The figure 2 shows a profile view of a model 50 obtained after gluing assembly of the two layers 40 and 60.

Chaque strate 40 ou 60 composant le modèle est préalablement obtenue par moulage dans une empreinte d'injection. Chaque strate 40 ou 60 est donc issue d'un moule formé par deux demi-empreintes. Les figures 3A et 3B représentent les demi-empreintes 80 et 82 d'un même moule pour l'obtention d'une strate d'un modèle perdu de culasse. Les figures 1 et 2 montrent des joints de liaison de demi-empreintes de moule lors de l'obtention des différentes strates 40 et 60. Selon la figure 1, la strate 40 comporte ainsi un joint de liaison 44 alors que la strate 60 comporte un joint de liaison 66.Each stratum 40 or 60 composing the model is previously obtained by molding in an injection cavity. Each stratum 40 or 60 is therefore derived from a mold formed by two half-impressions. The Figures 3A and 3B represent half-impressions 80 and 82 of the same mold for obtaining a stratum of a lost breech model. The figures 1 and 2 show connection joints of mold half-impressions when obtaining the different strata 40 and 60. According to the figure 1 the stratum 40 thus has a connection joint 44 while the stratum 60 has a connection joint 66.

Du fait du procédé d'obtention de chaque strate 40 ou 60 par moulage, la strate peut comporter des variations liées au jeu de fermeture des demi-empreintes 80 et 82. La figure 4 montre un schéma de l'assemblage de la strate 40 avec une strate 60 dont l'obtention par moulage a entraîné une variation de géométrie le long du joint de liaison 66. Les conséquences de cette variation peuvent entraîner une mauvaise mise en correspondance au joint de collage des strates. Ainsi la figure 5 montre la création d'une zone de fuite au niveau du joint de collage 22 entre la surface de collage 46 de la strate 40 et la surface de collage 64 correspondante de la strate 60. En comparaison, la figure 6 montre le joint de collage entre la strate 40 et la strate 60 en l'absence de zone de fuite. Après collage de toutes les strates, de telles variations peuvent se cumuler du fait de l'empilage des strates.Because of the process for obtaining each layer 40 or 60 by molding, the layer may comprise variations related to the closing clearance of the half-impressions 80 and 82. figure 4 shows a diagram of the assembly of the stratum 40 with a stratum 60 whose obtaining by molding has caused a variation of geometry along the connection joint 66. The consequences of this variation can lead to a bad match at the joint of collage of strata. So the figure 5 shows the creation of a leakage zone at the seam 22 between the bonding surface 46 of the stratum 40 and the corresponding bonding surface 64 of the stratum 60. In comparison, the figure 6 shows the bonding joint between the stratum 40 and the stratum 60 in the absence of leakage zone. After bonding all the strata, such variations can accumulate because of the stacking of the strata.

Il existe alors des outils de collage, ou machines d'assemblage par collage de strates, qui proposent un réglage tridimensionnel et préalable de la position respective des supports. Un tel réglage tridimensionnel est couramment désigné par le terme de "réglage en X, Y et Z". Un tel réglage permet une mise en conformité des formes des strates au niveau du joint de collage 22. Ainsi, le joint peut prendre des formes complexes et présenter, par exemple, des pentes inverses. Le réglage des outils est effectué, préalablement au collage, par rapport à un lot de modèle. Pour prendre en compte la dispersion par rapport aux lots suivants, un nouveau réglage est effectué pour s'adapter aux variations des strates. Cette reprise des réglages pour chaque lot complexifie l'obtention de modèle perdu à l'aide de tels outils.There are then gluing tools, or assembly machines by bonding layers, which provide a three-dimensional adjustment and prior to the respective position of the supports. Such a three-dimensional adjustment is commonly referred to as "X, Y and Z adjustment". Such an adjustment makes it possible to bring the shapes of the strata into conformity with the level of the bonding joint 22. Thus, the seal can assume complex shapes and present, for example, inverse slopes. The setting of the tools is performed, prior to gluing, with respect to a model lot. To take into account the dispersion with respect to subsequent batches, a new adjustment is made to adapt to the variations of the layers. This resumption of the settings for each lot makes it more difficult to obtain a lost model using such tools.

De plus, il peut être préférable de prévoir une reprise des réglages préalables à chaque assemblage de strates d'un même lot. En effet, malgré le respect des tolérances de variations dues à l'obtention d'un lot de strates par moulage, un seul réglage en X, Y et Z par lot peut laisser subsister des problèmes de collage causés par de légères variations au sein d'un même lot. La figure 4 illustre un tel problème de collage même lorsque les tolérances de moulage ont été prises en compte pour un lot de strates. La partie droite du modèle formé par les strates 40 et 60 peut alors être soumise à une contrainte en compression, c'est-à-dire à un serrage excessif, (représentée par un "+") des surfaces de collage 46 et 64 alors que la partie gauche du même modèle peut être soumise à une contrainte en traction (représentée par un "-") après le collage des deux strates.In addition, it may be preferable to provide for a resumption of the pre-setting before each assembly of strata of the same batch. Indeed, in spite of respecting the tolerances of variations due to obtaining a batch of layers by molding, a single adjustment in X, Y and Z per batch can leave sticking problems caused by slight variations within the same lot. The figure 4 illustrates such a problem of bonding even when the molding tolerances have been taken into account for a batch of layers. The right part of the model formed by the strata 40 and 60 can then be subjected to a compressive stress, that is to say to an excessive tightening, (represented by a "+") of the bonding surfaces 46 and 64 then that the left part of the same model can be subjected to a tensile stress (represented by a "-") after the bonding of the two layers.

Il existe donc un besoin pour un assemblage par collage de strates d'un modèle perdu qui soit moins complexe et plus précis face aux variations au sein d'un même lot de strates et entre les différents lots de strates.There is therefore a need for a collage assembly of strata of a lost model that is less complex and more accurate with respect to variations within the same batch of strata and between the different batches of strata.

Pour cela l'invention propose une machine d'assemblage par collage de strates d'un modèle pour procédé de moulage par modèle perdu, la machine comprenant :

  • un premier support d'une première strate du modèle ;
  • un deuxième support d'une deuxième strate du modèle ;
    les premier et deuxième supports étant adaptés à être déplacés l'un vers l'autre, dans une direction de collage, pour coller les première et deuxième strates ensemble,
    la machine d'assemblage comprenant des organes d'auto-centrage des strates, lors de la mise en position d'assemblage des strates, dans un plan orthogonal à la direction de collage
For this purpose, the invention proposes a machine for bonding layers of a model for a lost model molding process, the machine comprising:
  • a first support of a first stratum of the model;
  • a second support of a second layer of the model;
    the first and second supports being adapted to be moved towards each other, in a gluing direction, to bond the first and second layers together,
    the assembly machine comprising self-centering members of the layers, when the strata are placed in the assembly position, in a plane orthogonal to the gluing direction

Selon une variante, les organes d'auto-centrage permettent un débattement de - 0,5mm à + 0,5mm dans au moins une direction contenue dans le plan orthogonal à la direction de collage, de préférence dans toutes les directions contenues dans le plan orthogonal à la direction de collage.According to one variant, the self-centering members allow a clearance of -0.5 mm to +0.5 mm in at least one direction contained in the plane orthogonal to the gluing direction, preferably in all the directions contained in the plane. orthogonal to the gluing direction.

Selon une variante, la machine comprend, en plus des organes d'auto-centrage, des organes de réglage nominal d'un positionnement respectif du premier support et du deuxième support dans le plan orthogonal à la direction de collage.According to a variant, the machine comprises, in addition to the self-centering members, nominal adjustment members of a respective positioning of the first support and the second support in the plane orthogonal to the gluing direction.

Selon une variante, les organes d'auto-centrage comprennent :

  • un jeu de billes de roulement permettant un déplacement dans au moins une direction contenue dans le plan orthogonal à la direction de collage ;
  • une paire de poussoirs à ressort orientés selon la même direction de déplacement du jeu de billes, les poussoirs de la paire étant orientés chacun selon un sens différent.
According to one variant, the self-centering members comprise:
  • a set of rolling balls allowing movement in at least one direction contained in the plane orthogonal to the gluing direction;
  • a pair of spring plungers oriented in the same direction of movement of the set of balls, the pushers of the pair being each oriented in a different direction.

Selon une variante, la machine comprend un bâti sur lequel les premiers et deuxièmes supports sont montés, les organes d'auto-centrage étant disposés uniquement entre le bâti et l'un parmi le premier support et le deuxième support.According to a variant, the machine comprises a frame on which the first and second supports are mounted, the self-centering members being arranged only between the frame and one of the first support and the second support.

L'invention propose en outre un procédé d'assemblage par collage de strates d'un modèle pour procédé de moulage par modèle perdu comprenant l'utilisation de la machine d'assemblage précédente, le procédé comprenant en outre :

  • les mises en place d'une première strate et d'une deuxième strate de modèle sur le premier support et le deuxième support respectivement ;
  • la fourniture d'une colle d'assemblage des strates à une température de collage, la colle étant par exemple fournie par l'intermédiaire d'un masque d'encollage disposé entre les première et deuxième strates ;
  • le collage des première et deuxième strates par déplacement respectif des supports dans la direction de collage.
The invention further provides a method of bonding strata of a model for a lost model molding process comprising using the preceding assembly machine, the method further comprising:
  • setting up a first stratum and a second model stratum on the first support and the second support respectively;
  • supplying a glue for assembling the layers at a gluing temperature, the glue being for example provided via a sizing mask disposed between the first and second layers;
  • gluing the first and second layers by respective displacement of the supports in the gluing direction.

Selon une variante, la première strate présente une surface de collage prévue pour être collée à une surface de collage de la deuxième strate, les surfaces de collage des première et deuxième strates présentant des pentes inclinées d'un angle supérieur à 10°, de préférence supérieur à 15° par rapport à un plan orthogonal à la direction de collage.According to one variant, the first layer has a bonding surface intended to be bonded to a bonding surface of the second layer, the bonding surfaces of the first and second layers having slopes inclined at an angle greater than 10 °, preferably greater than 15 ° with respect to a plane orthogonal to the gluing direction.

Selon une variante, la colle présente une viscosité Brookfield comprise entre 700 et 1800 mPa.s à la température de collage, de préférence une viscosité Brookfield comprise entre 1000 et 1500 mPa.s, la température de collage étant de préférence comprise entre 110 °C et 130 °C.According to one variant, the adhesive has a Brookfield viscosity of between 700 and 1800 mPa.s at the bonding temperature, preferably a viscosity Brookfield between 1000 and 1500 mPa.s, the bonding temperature being preferably between 110 ° C and 130 ° C.

Selon une variante, les strates sont obtenues par injection de polystyrène dans des moules.According to one variant, the layers are obtained by injection of polystyrene into molds.

L'invention propose encore un procédé de moulage par modèle perdu comprenant l'assemblage d'un modèle pour moulage à modèle perdu selon le procédé précédent, le modèle assemblé étant de préférence une culasse d'un moteur à combustion interne.The invention further provides a lost model molding method comprising assembling a model for lost pattern casting according to the preceding method, the assembled model being preferably a cylinder head of an internal combustion engine.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit de modes de réalisation de l'invention, donnés à titre d'exemple uniquement et en référence aux dessins qui montrent :

  • figure 1, une vue schématique d'un assemblage de deux strates à l'aide d'un outillage de collage selon l'art antérieur ;
  • figure 2, une vue de profil d'un modèle obtenu après assemblage par collage de deux strates ;
  • figures 3A et 3B, une représentation en perspective de demi-empreintes d'un même moule pour l'obtention d'une strate d'un modèle perdu de culasse ;
  • figure 4, un schéma de l'assemblage selon l'art antérieur d'une strate avec une autre strate dont l'obtention par moulage a entraîné une variation de géométrie le long du joint de liaison ;
  • figure 5, une vue d'une zone de fuite au niveau du joint de collage entre les strates ;
  • figure 6, une vue du joint de collage entre les strates en l'absence de zone de fuite ;
  • figure 7, une vue schématique d'un assemblage par collage de deux strates à l'aide d'une machine selon un mode de réalisation ;
  • figure 8, une vue en perspective d'un support d'une machine d'assemblage selon un autre mode de réalisation ;
  • figure 9, une vue en coupe selon le plan P du support de la figure 8 ;
  • figures 10A et 10B, une vue en perspective et une vue en perspective éclatée d'un axe d'auto-centrage dans le mode de réalisation de la figure 9 ;
  • figures 11A et 11B, une vue en perspective et une vue en perspective éclatée d'un support de poussoirs à ressort dans le mode de réalisation de la figure 8 ;
  • figures 12A et 12B, des vues en coupe de deux modes de réalisation de poussoir à ressorts.
Other features and advantages of the invention will appear on reading the following detailed description of embodiments of the invention, given by way of example only and with reference to the drawings which show:
  • figure 1 , a schematic view of an assembly of two layers using a bonding tool according to the prior art;
  • figure 2 , a profile view of a model obtained after bonding of two layers;
  • Figures 3A and 3B , a perspective representation of half-impressions of the same mold for obtaining a stratum of a lost breech model;
  • figure 4 , a diagram of the assembly according to the prior art of a stratum with another layer whose obtaining by molding has caused a variation of geometry along the connection joint;
  • figure 5 a view of a leakage zone at the bonding joint between the layers;
  • figure 6 , a view of the bonding joint between the layers in the absence of leakage zone;
  • figure 7 a schematic view of an assembly by bonding two layers with a machine according to one embodiment;
  • figure 8 a perspective view of a support of an assembly machine according to another embodiment;
  • figure 9 , a sectional view along the plane P of the support of the figure 8 ;
  • Figures 10A and 10B , a perspective view and an exploded perspective view of a self-centering axis in the embodiment of the figure 9 ;
  • Figures 11A and 11B , a perspective view and an exploded perspective view of a spring-loaded pusher support in the embodiment of the figure 8 ;
  • Figures 12A and 12B cross-sectional views of two spring pusher embodiments.

Il est proposé une machine d'assemblage par collage de strates d'un modèle pour procédé de moulage par modèle perdu (PMP). Dans la suite de la description, il est fait référence aux figures 1 à 6 pour concrétiser la référence à une machine 20 et à un modèle perdu 50. La machine proposée comprend un premier support 24 et un deuxième support 26. Le premier support 24 permet le support d'une première strate 40 du modèle 50, alors que le deuxième support 26 permet le support d'une deuxième strate 60 du modèle 50. Les premier et deuxième supports 24 et 26 sont adaptés à être déplacés l'un vers l'autre, dans une direction de collage pour coller les première et deuxième strates 40 et 60 ensemble.It is proposed a laminating assembly machine of a model for lost model molding process (PMP). In the remainder of the description, reference is made to Figures 1 to 6 to concretize the reference to a machine 20 and a lost model 50. The proposed machine comprises a first support 24 and a second support 26. The first support 24 allows the support of a first layer 40 of the model 50, while the second support 26 allows the support of a second layer 60 of the model 50. The first and second supports 24 and 26 are adapted to be moved towards each other, in a gluing direction to glue the first and second layers 40 and 60 together.

La machine 20 comprend de plus des organes d'auto-centrage des strates 40 et 60. Cet auto-centrage s'effectue lors de la mise en position d'assemblage des strates 40 et 60. La mise en position d'assemblage des strates correspond au déplacement des premier et deuxième supports 24 et 26 l'un vers l'autre pour coller les strates ensemble.The machine 20 further comprises self-centering members of the strata 40 and 60. This self-centering takes place during the assembly position of the strata 40 and 60. The assembly position of the strata corresponds to the displacement of the first and second supports 24 and 26 towards each other to glue the layers together.

L'auto-centrage est assuré par les organes d'auto-centrage qui fournissent une liberté de déplacement respectif des supports 24 et 26 entre eux dans un plan orthogonal à la direction de collage. Cette liberté de déplacement permet une mise en correspondance des strates sans contrainte (la mise en correspondance correspond au terme anglais de "compliance"). L'absence de contrainte évite la détérioration des strates du modèle par exemple réalisées en polystyrène qui est un matériau fragile.Self-centering is provided by the self-centering members which provide respective freedom of movement of the supports 24 and 26 between them in a plane orthogonal to the direction of bonding. This freedom of movement allows a matching of strata without constraint (the matching corresponds to the English word "compliance"). The absence of stress prevents the deterioration of the layers of the model for example made of polystyrene which is a fragile material.

Les organes d'auto-centrage assurent de plus un ajustement automatique de la position d'un des deux supports par rapport à l'autre pour assurer un collage des strates 40 et 60 dépourvu de zone de fuite au niveau du joint de collage 22.The self-centering members further ensure an automatic adjustment of the position of one of the two supports relative to the other to ensure a bonding of the layers 40 and 60 devoid of leakage area at the bonding joint 22.

L'ajustement automatique est notamment possible du fait de la présence de pentes dans le joint de collage 22. Dans ce document, les pentes du joint de collage 22 correspondent à des pentes inclinées par rapport au plan orthogonal à la direction de collage des strates. Les pentes dans le joint de collage 22 correspondent à des pentes correspondantes présentées par la surface de collage 46 de la première strate 40 et par la surface de collage 64 de la deuxième strate 60. Pour assurer un auto-centrage le plus efficace possible, les pentes peuvent être inclinées d'un angle supérieur à 10°ou de préférence supérieur à 15°.The automatic adjustment is possible in particular because of the presence of slopes in the bonding joint 22. In this document, the slopes of the bonding joint 22 correspond to slopes inclined relative to the plane orthogonal to the bonding direction of the layers. The slopes in the bonding joint 22 correspond to corresponding slopes presented by the bonding surface 46 of the first layer 40 and by the bonding surface 64 of the second layer 60. In order to ensure the most efficient self-centering possible, the slopes may be inclined at an angle greater than 10 ° or preferably greater than 15 °.

Ainsi les strates 40 et 60 se positionnent par glissement des strates l'une sur l'autre par l'intermédiaire des pentes ainsi que de toute la géométrie du joint de collage 22. Ce glissement se produit lorsque les premier et deuxième supports 24 et 26 arrivent en fin de course de leur déplacement l'un vers l'autre selon la direction de collage.Thus the strata 40 and 60 are positioned by sliding the layers one over the other through the slopes as well as the entire geometry of the bonding joint 22. This sliding occurs when the first and second supports 24 and 26 arrive at the end of the race of their displacement towards each other according to the direction of collage.

De par cet ajustement automatique et sans contrainte, la machine proposée permet un assemblage simple indépendamment des possibles variations de géométrie des strates. En définitive, l'invention permet un assemblage par collage de strates d'un modèle perdu qui soit moins complexe et plus précis face aux variations au sein d'un même lot de strates et entre les différents lots de strates.By this automatic adjustment and without constraint, the proposed machine allows a simple assembly independently of the possible variations of geometry of the layers. Ultimately, the invention allows assembly by bonding strata of a lost model that is less complex and more accurate to variations within the same batch of strata and between different batches of strata.

De ce fait, la machine entraîne une diminution du nombre de rebuts de modèle liés à un mauvais collage.As a result, the machine causes a decrease in the number of model rejects related to a bad bond.

Du fait de la présence des organes d'auto-centrage, la machine 20 en elle-même assure la fonction recherchée qui permet la mise en correspondance des strates supportées ultérieurement par les supports 24 et 26. Ainsi la machine 20, c'est-à-dire l'outillage de collage, intègre directement la solution d'auto-centrage sans préparation particulière des strates à coller, ou réglage spécifique à chaque strate.Because of the presence of the self-centering members, the machine 20 itself provides the desired function which allows the matching of the layers subsequently supported by the supports 24 and 26. Thus the machine 20, that is, ie the bonding tooling, directly integrates the self-centering solution without special preparation of the strata to be glued, or setting specific to each stratum.

Cette machine 20 peut être avantageusement utilisée dans un procédé d'assemblage par collage des strates d'un modèle PMP. Ainsi l'invention concerne aussi un tel procédé d'assemblage par collage de strates d'un modèle PMP, permettant ainsi l'obtention des avantages précédents.This machine 20 can be advantageously used in a method of assembling by bonding the layers of a PMP model. Thus, the invention also relates to such a method of assembling by bonding layers of a PMP model, thereby obtaining the above advantages.

Un tel procédé comprend les mises en place préalables de la première strate 40 et de la deuxième strate 60 du modèle 50 sur le premier support 24 et le deuxième support 26 respectivement. La machine 20 proposée peut en effet être à l'origine complètement dépourvue des strates 40 et 60.Such a method comprises the prior implementations of the first layer 40 and the second layer 60 of the model 50 on the first support 24 and the second support 26 respectively. The machine 20 proposed can indeed be originally completely devoid of strata 40 and 60.

Le procédé proposé comprend ensuite la fourniture d'une colle d'assemblage des strates 40 et 60 à une température de collage. La colle peut par exemple être fournie par l'intermédiaire d'un masque d'encollage (non représenté) disposé entre les première et deuxième strates 40 et 60. La température de collage est choisie selon la nature thermofusible de la colle pour obtenir une viscosité de la colle qui permette le glissement sans contraintes des strates 40 et 60 l'une sur l'autre. Pour permettre un tel glissement, la colle utilisée peut présenter une viscosité Brookfield comprise entre 700 et 1800 mPa.s à la température de collage. De préférence, la colle utilisée présente une viscosité Brookfield comprise entre 1000 et 1500 mPa.s à la température de collage. Une telle colle correspond par exemple à la colle commercialisée sous le nom SWIFTHERM 607 par la société forbo adhesives et présentant une viscosité Brookfield de 1800 mPa.s à 100°C, 1250 mPa.s à 120°C et 700 mPa.s à 140°C. Pour une telle colle thermofusible, la température de collage est de préférence comprise entre 110°C et 130°C, plus particulièrement la température de collage peut être de 120°C. D'une manière générale la température de collage peut être comprise entre 110°C et 130°C.The proposed method then comprises providing a glue for assembling strata 40 and 60 at a gluing temperature. The adhesive may for example be provided via a sizing mask (not shown) disposed between the first and second layers 40 and 60. The bonding temperature is chosen according to the hot melt nature of the adhesive to obtain a viscosity glue that allows the sliding without stresses 40 and 60 layers on each other. To allow such sliding, the glue used may have a Brookfield viscosity of between 700 and 1800 mPa.s at the bonding temperature. Preferably, the adhesive used has a Brookfield viscosity of between 1000 and 1500 mPa.s at the bonding temperature. Such an adhesive corresponds, for example, to the adhesive sold under the name SWIFTHERM 607 by forbo adhesives and having a Brookfield viscosity of 1800 mPa.s at 100 ° C., 1250 mPa.s at 120 ° C. and 700 mPa.s at 140 ° C. ° C. For such a hot-melt adhesive, the bonding temperature is preferably between 110 ° C and 130 ° C, more particularly the bonding temperature may be 120 ° C. In general, the bonding temperature can be between 110 ° C. and 130 ° C.

Le procédé comprend ensuite le collage des première et deuxième strates 40 et 60 par déplacement respectif des supports 24 et 26 dans la direction de collage.The method then comprises bonding the first and second layers 40 and 60 by respective displacement of the supports 24 and 26 in the gluing direction.

Du fait de l'auto-centrage des strates, la machine d'assemblage et le procédé d'assemblage sont particulièrement avantageux pour les strates obtenues par injection dans des moules, tel que les moules illustrés par les figures 3A et 3B. En effet, de telles strates 40 et 60 qui peuvent présenter des variations dimensionnelles au niveau du joint de liaison 44 ou 66, telles que précédemment évoquées. Ces variations dimensionnelles, qui sont dans l'intervalle de tolérance de fabrication des strates 40 et 60, sont prises en compte automatiquement par l'auto-centrage proposé, ce qui permet d'éviter le collage des strates avec une zone de fuite et une zone de trop grande compression du modèle. De plus, l'auto-centrage proposé permet d'éviter l'accumulation des tolérances de chaque strate du fait de leur empilage. On peut ainsi effectuer un seul réglage nominal d'un positionnement respectif du premier support 24 et du deuxième support 26 pour un jeu de strates ou même pour un ensemble de jeux de strates obtenus par injection dans des moules. Après l'assemblage par collage de deux strates auto-centrées, l'enlèvement des strates collées permet de retrouver le réglage nominal précédent. Conformément, la machine peut comprendre, en plus des organes d'auto-centrage, des organes de réglage nominal d'un positionnement respectif du premier support et du deuxième support dans le plan orthogonal à la direction de collage.Because of the self-centering of the layers, the assembly machine and the assembly method are particularly advantageous for the strata obtained by injection into molds, such as the molds illustrated by the Figures 3A and 3B . Indeed, such strata 40 and 60 may have dimensional variations at the connection joint 44 or 66, as previously mentioned. These dimensional variations, which are in the manufacturing tolerance range of the strata 40 and 60, are automatically taken into account by the proposed self-centering, which makes it possible to avoid the bonding of the layers with a zone of leak and an area of too much compression of the model. In addition, the proposed self-centering avoids the accumulation of tolerances of each stratum because of their stacking. It is thus possible to perform a single nominal adjustment of a respective positioning of the first support 24 and the second support 26 for a set of strata or even for a set of sets of layers obtained by injection into molds. After bonding two self-centering layers, the removal of the bonded layers allows the previous nominal setting to be restored. Accordingly, the machine may comprise, in addition to the self-centering members, nominal adjustment members of a respective positioning of the first support and the second support in the plane orthogonal to the gluing direction.

Plus particulièrement les strates 40 et 60 peuvent être obtenues par injection de polystyrène. L'utilisation de la colle SWIFTHERM 607 est particulièrement avantageuse pour l'assemblage de strates en polystyrène selon le procédé proposé.More particularly, the layers 40 and 60 can be obtained by injection of polystyrene. The use of SWIFTHERM 607 glue is particularly advantageous for the assembly of polystyrene layers according to the proposed method.

De façon encore plus préférée, l'assemblage des strates permet l'obtention d'un modèle perdu de culasse tel qu'illustré par la figure 2. Ainsi l'invention concerne en outre un procédé de moulage par modèle perdu comprenant le procédé précédent d'assemblage du modèle perdu. Le procédé de moulage permet de préférence l'obtention d'une culasse de moteur à combustion interne.Even more preferably, the assembly of the strata makes it possible to obtain a lost breech model as illustrated by FIG. figure 2 . Thus the invention further relates to a lost model molding method comprising the previous method of assembling the lost model. The molding process preferably makes it possible to obtain an internal combustion engine cylinder head.

Différents modes de réalisation des organes d'auto-centrage de la machine 20 peuvent être envisagés.Various embodiments of the self-centering members of the machine 20 may be envisaged.

La figure 7 montre une vue schématique d'un assemblage par collage des strates 40 et 60 à l'aide de la machine 20 comprenant des organes d'auto-centrage selon un mode de réalisation. Selon ce mode de réalisation, les organes d'auto-centrage comprennent :

  • un jeu de billes 30 de roulement permettant un déplacement dans au moins une direction contenue dans le plan orthogonal à la direction de collage ;
  • une paire de poussoirs à ressort 38 orientés selon la même direction de déplacement du jeu de billes.
The figure 7 shows a schematic view of a bonding assembly of the layers 40 and 60 with the machine 20 comprising self-centering members according to one embodiment. According to this embodiment, the self-centering members comprise:
  • a set of rolling balls for moving in at least one direction contained in the plane orthogonal to the gluing direction;
  • a pair of spring loaded pushers 38 oriented in the same direction of movement of the set of balls.

L'utilisation de billes 30 de roulement permet d'obtenir une mécanique d'auto-centrage très sensible en n'opposant qu'un minimum de frottement. Le jeu de billes 30 de roulement peut être assimilé à un "lit" de billes de roulement.The use of rolling balls makes it possible to obtain a very sensitive self-centering mechanism by opposing only a minimum of friction. The set of rolling balls can be likened to a "bed" of rolling balls.

Il est préférable d'orienter les poussoirs à ressorts 38 chacun dans un sens différent, notamment lorsque les strates présentent un profil de surface de collage déséquilibré. Une surface de collage déséquilibré correspond par exemple à une surface de collage ayant plus de pentes orientées vers la droite que de pentes orientées vers la gauche. Du fait du plus grand nombre de pentes orientées à droite, la mise en position s'assemblage des strates peut tendre, par réaction, vers une mise en correspondance trop à gauche. L'orientation de la paire de poussoirs 38 selon deux sens différents dans une même direction permet de rééquilibrer la mise en correspondance des strates 40 et 60 lors de leur assemblage.It is preferable to orient the spring pushers 38 each in a different direction, especially when the strata have an imbalanced bonding surface profile. An unbalanced bonding surface corresponds, for example, to a bonding surface having more slopes oriented to the right than slopes oriented to the left. Because of the greater number of right-hand slopes, the setting of the strata into position can tend, by reaction, to a left-to-left mapping. The orientation of the pair of pushers 38 in two different directions in the same direction makes it possible to rebalance the matching of the strata 40 and 60 during their assembly.

Les organes d'auto-centrage décrits en référence à la figure 7 permettent un débattement de - 0,5mm à + 0,5mm dans au moins une direction contenue dans le plan orthogonal à la direction de collage. Il est avantageux que le débattement de - 0,5mm à + 0,5mm soit possible dans toutes les directions contenues dans le plan orthogonal à la direction de collage. D'une manière générale le débattement permis par les organes d'auto-centrage est adapté à la tolérance maximum liée à l'obtention des strates par moulage, notamment par moulage dans deux demi-empreintes d'injection.The self-centering devices described with reference to the figure 7 allow a clearance of - 0.5mm to + 0.5mm in at least one direction contained in the plane orthogonal to the gluing direction. It is advantageous if the clearance from -0.5 mm to +0.5 mm is possible in all the directions contained in the plane orthogonal to the gluing direction. In general, the clearance allowed by the self-centering members is adapted to the maximum tolerance related to obtaining the layers by molding, in particular by molding in two half-injection impressions.

Dans le mode de réalisation de la figure 7, les organes d'auto-centrage peuvent comprendre au moins deux paires de poussoirs à ressorts, chaque paire de poussoirs à ressort étant orientée selon deux directions différentes du plan orthogonal à la direction de collage.In the embodiment of the figure 7 the self-centering members may comprise at least two pairs of spring plungers, each pair of spring plungers being oriented in two different directions of the plane orthogonal to the gluing direction.

En référence à la figure 7, les organes d'auto-centrage sont uniquement disposés entre le deuxième support 26 et le bâti (non représenté). Ainsi aucun organe d'auto-centrage n'est disposé entre le premier support 24 et le bâti. Cependant un support intermédiaire 28 peut être prévu entre les organes d'auto-centrage du deuxième support 26 et le bâti. Ce support intermédiaire 28 permet notamment le réglage nominal d'un positionnement respectif du premier support et du deuxième support dans le plan orthogonal à la direction de collage. L'ensemble formé par le support 26 et le support intermédiaire 28 correspond à un conformateur de dépose car il est prévu pour être disposé en partie basse de la machine 20, lorsque la direction de collage est verticale.With reference to the figure 7 , the self-centering members are only arranged between the second support 26 and the frame (not shown). Thus no self-centering member is disposed between the first support 24 and the frame. However, an intermediate support 28 may be provided between the self-centering members of the second support 26 and the frame. This intermediate support 28 allows in particular the nominal adjustment of a respective positioning of the first support and the second support in the plane orthogonal to the gluing direction. All formed by the support 26 and the intermediate support 28 corresponds to a deposition shaper because it is intended to be arranged in the lower part of the machine 20, when the gluing direction is vertical.

La figure 8 montre une vue en perspective du support 24 d'une machine d'assemblage 20 selon un autre mode de réalisation des organes d'auto-centrage. Selon ce mode de réalisation, les organes d'auto-centrage sont uniquement disposés entre le premier support 24 et le bâti. Ainsi, selon ce mode de réalisation, il est possible qu'aucun organe d'auto-centrage ne soit disposé entre le deuxième support 26 et le bâti. Cependant un support intermédiaire 84 peut être prévu entre les organes d'auto-centrage du premier support 24 et le bâti. De même que dans le mode de réalisation précédent, l'utilisation du support intermédiaire 84 entre les organes d'auto-centrage du premier support 24 et le bâti permet le réglage nominal des premier et deuxième supports dans le plan orthogonal à la direction de collage.The figure 8 shows a perspective view of the support 24 of an assembly machine 20 according to another embodiment of the self-centering members. According to this embodiment, the self-centering members are only arranged between the first support 24 and the frame. Thus, according to this embodiment, it is possible that no self-centering element is disposed between the second support 26 and the frame. However, an intermediate support 84 may be provided between the self-centering members of the first support 24 and the frame. As in the previous embodiment, the use of the intermediate support 84 between the self-centering members of the first support 24 and the frame allows the nominal adjustment of the first and second supports in the plane orthogonal to the direction of bonding .

L'ensemble formé par le support 24 et le support intermédiaire 84 correspond à un conformateur de préhension ou préhenseur car il est prévu pour être disposé en partie haute de la machine 20, lorsque la direction de collage est verticale. Une partie des organes d'auto-centrage est formé par au moins un axe 70 d'auto-centrage. Selon le mode de réalisation illustré en figure 8, les organes d'auto-centrage comprennent quatre axes 70 d'auto-centrage disposés chacun à un coin du premier support 24.The assembly formed by the support 24 and the intermediate support 84 corresponds to a gripper shaper or gripper because it is intended to be arranged in the upper part of the machine 20, when the bonding direction is vertical. Part of the self-centering members is formed by at least one axis 70 of self-centering. According to the embodiment illustrated in figure 8 , the self-centering members comprise four self-centering pins 70 each arranged at a corner of the first support 24.

La figure 9 montre une vue en coupe, selon le plan hachuré P, du premier support 24 et du support intermédiaire 84. Cette vue correspond à une coupe dans le plan de la ligne L de la figure 8. La figure 9 coupe le support 24 et le support 84 au niveau de l'axe 70 d'auto-centrage. Les figures 10A et 10B montrent une vue en perspective et une vue en perspective éclatée de l'axe 70 d'auto-centrage précédent.The figure 9 shows a sectional view, according to the hatched plane P, of the first support 24 and the intermediate support 84. This view corresponds to a section in the plane of the line L of the figure 8 . The figure 9 cut the support 24 and the support 84 at the axis 70 of self-centering. The Figures 10A and 10B show a perspective view and an exploded perspective view of the previous self-centering axis 70.

L'axe 70 est composé de deux jeux de billes 30 de roulement. Ces deux jeux de billes 30 sont chacun tenu par une cage 72. Ces jeux de billes sont par ailleurs chacun emprisonné dans une cavité délimitée en partie par la pièce 86. D'un côté la pièce 86 définit une cavité avec la plaque 74, et d'un autre côté la pièce 86 définit une cavité avec la rondelle 76. Chacun des jeux de billes 30 peut glisser librement dans le plan orthogonal au collage tout en étant guidés par la pièce 86 d'une part et l'une des pièces parmi la plaque 74 et la rondelle 76 d'autre part. La pièce 86 est fixée au support intermédiaire 84 à l'aide d'un écrou 88 alors que la plaque 74 et la rondelle 76 sont solidaires du premier support 24, par exemple à l'aide de vis 78. Ainsi l'axe 70 proposé permet le déplacement dans toutes les directions contenues dans le plan orthogonal à la direction de collage.The axis 70 is composed of two sets of rolling balls. These two sets of balls 30 are each held by a cage 72. These sets of balls are also each trapped in a cavity delimited in part by the part 86. On one side the part 86 defines a cavity with the plate 74, and on the other hand, the part 86 defines a cavity with the washer 76. Each of the sets of balls 30 can to slide freely in the plane orthogonal to the gluing while being guided by the piece 86 on the one hand and one of the pieces among the plate 74 and the washer 76 on the other hand. The part 86 is fixed to the intermediate support 84 by means of a nut 88 while the plate 74 and the washer 76 are secured to the first support 24, for example by means of screws 78. Thus the proposed axis 70 allows displacement in all directions contained in the plane orthogonal to the gluing direction.

Selon le mode de réalisation de la figure 8, les organes d'auto-centrage comprennent en outre un support de poussoirs à ressort à chaque coin du support 24. Ces quatre supports de poussoirs à ressorts ne sont pas visibles en figure 8. Cependant les figures 11A et 11B montre une vue en perspective et une vue en perspective éclatée d'un tel support 32 de poussoir à ressort. Les poussoirs à ressorts 38 sont alors reçus dans des alésages du support 32 de poussoirs à ressort. Selon ce mode de réalisation, le premier support 24 comprend quatre paires de poussoirs à ressort réparties dans deux directions différentes du plan orthogonal au collage. Deux paires de poussoirs à ressort réparties dans deux directions différentes peuvent suffire, tel que précédemment décrit en référence au mode de réalisation de la figure 7. Cependant, un nombre supérieur de paires de poussoirs contribue à la stabilité de la machine 20. Dans tous les cas, pour une paire de poussoirs orientés dans la même direction, chaque poussoir de la paire est de préférence orienté dans un sens différent tel que précédemment décrit.According to the embodiment of the figure 8 , the self-centering members further comprise a spring loaded plunger support at each corner of the support 24. These four spring plunger supports are not visible in figure 8 . However, Figures 11A and 11B shows a perspective view and an exploded perspective view of such a support 32 spring loaded. The spring loaded pushers 38 are then received in bores of the support 32 of spring pushers. According to this embodiment, the first support 24 comprises four pairs of spring plungers distributed in two different directions of the plane orthogonal to the bonding. Two pairs of spring plungers distributed in two different directions may suffice, as previously described with reference to the embodiment of the invention. figure 7 . However, a greater number of pairs of pushers contributes to the stability of the machine 20. In all cases, for a pair of pushers oriented in the same direction, each push of the pair is preferably oriented in a different direction as previously described.

Indépendamment du mode de réalisation envisagé pour la machine 20, les poussoirs à ressorts 38 peuvent être choisis au moins parmi les poussoirs à ressorts 38 avec billes ou avec doigts. les figures 12A et 12B montrent des vues en coupe de ces deux modes de réalisation de poussoir à ressorts. La figure 12A montre un poussoir à ressort 38 de diamètre d1 avec doigt 34 de diamètre d3. Ce poussoir à doigt 34 permet par exemple un débattement w2 de 0 à 0,5 mm. La figure 12B montre un poussoir à ressort 38 de diamètre d1 avec bille 36 de diamètre d2. Ce poussoir à bille 36 permet par exemple un débattement w1 de 0 à 0,5 mm.Regardless of the embodiment envisaged for the machine 20, the spring pushers 38 may be chosen at least from the spring pushers 38 with balls or with fingers. the Figures 12A and 12B show cross-sectional views of these two spring pusher embodiments. The figure 12A shows a spring pusher 38 of diameter d1 with finger 34 of diameter d3. This finger plunger 34 allows for example a deflection w2 from 0 to 0.5 mm. The figure 12B shows a spring plunger 38 of diameter d1 with ball 36 of diameter d2. This ball pusher 36 allows for example a deflection w1 from 0 to 0.5 mm.

Claims (10)

  1. A machine for assembling by adhesive bonding of strata a pattern for a lost-pattern moulding method, the machine (20) including:
    • a first support (24) for a first stratum (40) of the pattern (50);
    • a second support (26) for a second stratum (60) of the pattern (50);
    the first and second supports (24, 26) being designed to be moved towards one another, in an adhesive-bonding direction, in order to adhesively bond the first and second strata (40, 60) together,
    the assembly machine (20) being characterized in that it includes members (30, 38, 70) for the self-centring of the strata, when placing the strata (40, 60) in an assembly position, in a plane orthogonal to the adhesive-bonding direction.
  2. The machine according to Claim 1, characterized in that the self-centring members (30, 38, 70) permit a displacement of - 0.5 mm to + 0.5 mm in at least one direction contained in the plane orthogonal to the adhesive-bonding direction, preferably in all the directions contained in the plane orthogonal to the adhesive-bonding direction.
  3. The machine according to Claim 1 or 2, characterized in that it includes, in addition to the self-centring members (30, 38, 70), nominal adjustment members of a respective positioning of the first support (40) and of the second support (60) in the plane orthogonal to the adhesive-bonding direction.
  4. The machine according to one of Claims 1 to 3, characterized in that the self-centring members (30, 38, 70) include:
    • a set of ball bearings (30) permitting a movement in at least one direction contained in the plane orthogonal to the adhesive-bonding direction;
    • a pair of spring plungers (38) oriented along the same direction of movement of the set of ball bearings (30), the plungers (38) of the pair each being oriented in a different direction.
  5. The machine according to one of Claims 1 to 4, characterized in that it includes a frame on which the first and second supports (40, 60) are mounted, the self-centring members (30, 38, 70) being disposed solely between the frame and one of the first support (40) and the second support (60).
  6. A method for assembling by adhesive bonding of strata a pattern for a lost-pattern moulding method, the method being characterized in that it includes the use of an assembly machine (20) according to one of Claims 1 to 5, the method further including:
    • the putting in place of a first stratum (40) and of a second stratum (60) of pattern (50) on the first support (24) and the second support (26) respectively;
    • the supplying of an assembly adhesive of the strata (40, 60) at an adhesive bonding temperature, the adhesive being, for example, supplied by means of a sizing mask disposed between the first and second strata (40, 60);
    • the adhesive bonding of the first and second strata (40, 60) by respective movement of the supports (24, 26) in the adhesive-bonding direction.
  7. The assembling method according to Claim 6, characterized in that the first stratum (40) has an adhesive-bonding surface (46) provided to be adhesively bonded to an adhesive-bonding surface (64) of the second stratum (60), the adhesive-bonding surfaces (46, 64) of the first and second strata (40, 60) having slopes inclined by an angle greater than 10°, preferably greater than 15° with respect to a plane orthogonal to the adhesive-bonding direction.
  8. The assembling method according to Claim 6 or 7, characterized in that the adhesive has a Brookfield viscosity comprised between 700 and 1800 mPa.s at the adhesive-bonding temperature, preferably a Brookfield viscosity comprised between 1000 and 1500 mPa.s, the adhesive-bonding temperature being preferably comprised between 110 °C and 130 °C.
  9. The assembling method according to one of Claims 6 to 8, characterized in that the strata (40, 60) are obtained by injection of polystyrene in moulds (80, 82).
  10. A lost-pattern moulding method, characterized in that it includes the assembling of a pattern (50) for lost-pattern moulding according to one of Claims 6 to 9, the assembled pattern (50) being preferably a cylinder head of an internal combustion engine.
EP12731068.8A 2011-06-23 2012-05-25 Machine and method for assembling a pattern for lost-pattern moulding, and corresponding moulding method Active EP2723518B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1155530A FR2976830B1 (en) 2011-06-23 2011-06-23 MACHINE AND METHOD FOR ASSEMBLING A MODEL FOR LOST-MODE MOLDING, CORRESPONDING MOLDING METHOD
PCT/FR2012/051181 WO2012175836A2 (en) 2011-06-23 2012-05-25 Machine and method for assembling a pattern for lost-pattern moulding, and corresponding moulding method

Publications (3)

Publication Number Publication Date
EP2723518A2 EP2723518A2 (en) 2014-04-30
EP2723518B1 true EP2723518B1 (en) 2015-09-09
EP2723518B8 EP2723518B8 (en) 2015-10-28

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EP12731068.8A Active EP2723518B8 (en) 2011-06-23 2012-05-25 Machine and method for assembling a pattern for lost-pattern moulding, and corresponding moulding method

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EP (1) EP2723518B8 (en)
CN (1) CN103826778B (en)
BR (1) BR112013032045A2 (en)
FR (1) FR2976830B1 (en)
WO (1) WO2012175836A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3004974B1 (en) * 2013-04-30 2015-05-01 Peugeot Citroen Automobiles Sa SLEEPING DEVICE WITH SELF-ADAPTIVE STICK MASK FOR LOST MODEL FOUNDING PROCESS
DE102013214534B4 (en) * 2013-07-25 2021-07-01 Bayerische Motoren Werke Aktiengesellschaft Casting device and casting process
FR3021567B1 (en) * 2014-05-27 2016-05-27 Peugeot Citroen Automobiles Sa METHOD FOR MAKING A LOST MODEL FOR USE IN FOUNDRIES
CN105598362B (en) * 2016-01-06 2018-10-16 洛阳市致力新材料有限公司 A kind of combination unit of evaporative pattern composite hammer head apperance
CN106424549A (en) * 2016-10-24 2017-02-22 张晓光 Multi-pipe joint part investment casting mold
FR3058337B1 (en) * 2016-11-04 2018-11-30 Peugeot Citroen Automobiles Sa IMPROVED STRATA BONDING ASSEMBLY MACHINE OF A MODEL FOR LOST MODEL MOLDING PROCESS
FR3063445B1 (en) * 2017-03-03 2019-03-22 Peugeot Citroen Automobiles Sa DIMENSIONAL STRATA CONTROLLER OF A MODEL FOR LOST MODEL MOLDING PROCESS
FR3098133B1 (en) * 2019-07-02 2022-01-14 Psa Automobiles Sa ASSEMBLY BY STACKING SUB-PARTS TO DEFINE A COOLING DUCT PART WITH MINIMIZED PRESSURE DROP

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Publication number Priority date Publication date Assignee Title
JPS61126943A (en) * 1984-11-22 1986-06-14 Mazda Motor Corp Chaplet for casting cylinder block
JPS61266147A (en) * 1985-05-17 1986-11-25 Honda Motor Co Ltd Casting mold pattern for die for press
US5407523A (en) * 1993-08-13 1995-04-18 Outboard Marine Corporation Apparatus for assembling lost foam casting patterns
US5944948A (en) * 1998-04-02 1999-08-31 Centennial Technologies, Inc. Apparatus for assembling a pair of members
US7296615B2 (en) * 2004-05-06 2007-11-20 General Electric Company Method and apparatus for determining the location of core-generated features in an investment casting

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Publication number Publication date
WO2012175836A3 (en) 2013-02-21
EP2723518A2 (en) 2014-04-30
FR2976830A1 (en) 2012-12-28
CN103826778A (en) 2014-05-28
WO2012175836A2 (en) 2012-12-27
FR2976830B1 (en) 2013-06-28
BR112013032045A2 (en) 2016-12-13
CN103826778B (en) 2016-03-09
EP2723518B8 (en) 2015-10-28

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