EP3484683A1 - Hybrid blade for the lining of a tire mold - Google Patents

Hybrid blade for the lining of a tire mold

Info

Publication number
EP3484683A1
EP3484683A1 EP17745836.1A EP17745836A EP3484683A1 EP 3484683 A1 EP3484683 A1 EP 3484683A1 EP 17745836 A EP17745836 A EP 17745836A EP 3484683 A1 EP3484683 A1 EP 3484683A1
Authority
EP
European Patent Office
Prior art keywords
lamella
zone
molding
mold
anchoring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17745836.1A
Other languages
German (de)
French (fr)
Inventor
Etienne BLANCHET
Sébastien PICHOIR
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.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Generale des Etablissements Michelin SCA filed Critical Compagnie Generale des Etablissements Michelin SCA
Publication of EP3484683A1 publication Critical patent/EP3484683A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1272—Width of the sipe
    • B60C11/1281—Width of the sipe different within the same sipe, i.e. enlarged width portion at sipe bottom or along its length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B29C33/424—Moulding surfaces provided with means for marking or patterning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/68—Cutting profiles into the treads of tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0613—Means, e.g. sipes or blade-like elements, for forming narrow recesses in the tyres, e.g. cuts or incisions for winter tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1272—Width of the sipe
    • B60C2011/1277—Width of the sipe being narrow, i.e. less than 0.3 mm
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a sealing strip of a mold for tire vulcanization.
  • EP0868955 discloses a method of manufacturing mold parts using the so-called selective laser melting technique ("Selective Laser Melting" in English) in which packing elements, such as lamellae, are produced by selective melting. a powder formed of grains, using a laser beam.
  • This method makes it possible to construct lamellae by superposing layers of grains agglomerated by the laser beam.
  • An advantage of this technique is that the shape of the slat can be modeled by a computer. The laser can thus be driven by the computer to selectively form the successive layers respecting the dimensions of the modeled lamella.
  • the construction of the lamella is made from a plate whose surface is generally flat. This plate serves as a base for the construction of the lamella in successive layers.
  • the first agglomerated grain layer is formed directly on the tray.
  • this first layer is welded to the plate.
  • the other layers of agglomerated grains are then formed successively on the first layer. Once the lamella is formed, it is necessary to separate it from the plate. This decoupling operation is generally performed by cutting by electro-erosion.
  • WO201 1 161248 discloses a strip for a liner of a mold for vulcanizing a tread of a tire, said blade being manufactured by selective laser melting.
  • the sipe includes an anchor portion configured to anchor the sipe in a liner body, a molding portion configured to mold at least one cut in the tread of the tire.
  • the lamella further comprises reinforcing means entirely present at the anchoring portion of said lamella.
  • it is the entire lamellae, that is to say the anchoring part and the molding part, which is manufactured by selective laser melting.
  • the manufacturing time of this lamella can then be lengthened compared to a traditional production method, especially if the reinforcements of the anchoring portion have a complex shape.
  • the stiffeners provided are sometimes insufficient to adjust the deformations of the molding area. In addition, they are not in the right place compared to the body part. There is therefore a need to further improve the rigidity of lamellae made in whole or in part by laser sintering.
  • a first object of the invention is to provide a slat allowing to implement very varied profiles, including both complex profiles and thin profiles.
  • Another object of the invention is to provide a blade to optimize the tread characteristics of molded tires. Yet another object of the invention is to provide a slat having technical characteristics facilitating its manufacture.
  • the invention provides a cover for a liner of a mold for vulcanizing a tread of a tire, said cover comprising:
  • An anchor portion configured to anchor the sipe in a body of the liner
  • a molding part configured to mold at least one cutout in the tread of the tire
  • the molding zone being made according to a first method and the anchoring zone being made according to a second method different from the first one.
  • the molding zone is produced by a process involving a selective laser melting (the anchoring zone is in turn realized by a method without selective laser melting).
  • the anchoring zone is in turn realized by a method without selective laser melting.
  • This embodiment allows for slats with molding areas with complex profiles, while having anchor zones with simpler profiles, including profiles with very thin surface, difficult to achieve by melting selective laser.
  • This embodiment makes it possible to achieve the high added value part in the laser melting process and the anchoring zone, which is simpler, can be carried out in a traditional process in order to reduce costs, in particular in cases where this part is standardized.
  • the known solutions generate significant stresses and deformations on the strips completely obtained by laser melting. The assembly of two lamella elements made according to two different methods makes it possible to avoid these deformations.
  • the anchoring zone is made according to a method involving a selective laser melting (the molding zone is in turn carried out by a method without selective laser melting).
  • This second embodiment allows for slats with anchor zones with complex profiles, while having molding areas with simpler profiles, including profiles with very thin surface, impossible to achieve by selective laser fusion.
  • the lamella comprises at least one thin portion whose thickness is between 0.05 and 0.6 mm and preferably between 0.1 and 0.4 mm.
  • At least one of the parts of the strip is made of metal or composite material.
  • the assembly of the molding zone and the anchoring zone is carried out either by welding, or by pinning or clipping, or by crimping, or by gluing.
  • the assembly of the molding zone and the anchoring zone is performed by inserting these two elements in a mold fixing zone. Pre-positioning of the two parts of the lamella is carried out and the final assembly is done during the anchoring in the aluminum of the mold.
  • the invention also provides a mold for vulcanizing tires, comprising a plurality of strips as previously described.
  • FIG 1 is a perspective view of an example of a lamella inserted in a mold shown in section;
  • FIG 2 is a perspective of another example of lamella.
  • Figure 1 illustrates an embodiment of a strip 1 for a liner of a mold for vulcanizing a tread of a tire.
  • the body 5 in which the lamella is inserted is shown in section cross. It is observed that the strip extends from one side to the other of the body 5 and that a part, called the molding part 3, is free between the two cords 8 of the body 5.
  • the part of the lamella which is housed in the cords 8 and the base 9 of the body 5 forms an anchoring portion 2.
  • the molding portion 3 is configured to mold at least one cut in the tread of the tire.
  • the anchoring portion 2 is configured to maintain the lamella 1 in the body 5 of the liner.
  • the molding portion 3 is fixed to the anchoring portion 2 by pinning to form an assembly 6 in one piece.
  • FIG. 2 illustrates another exemplary embodiment in which the anchoring zone 2 is located under the axis A-A.
  • This anchoring zone forms a thin portion 4 with respect to the molding zone 3, for example between 0.05 and 0.3 mm.
  • the assembly 6 between the two parts 2 and 3 is made by welding.
  • Other modes of attachment are possible alternatively, such as fixing by pinning or clipping, or crimping.
  • the molding zone 3 is made according to a first method and the anchoring zone 2 is made according to a second method different from the first one.
  • the molding zone 3 is made according to a process involving selective laser melting. This method makes it possible to produce complex shapes or profiles, such as the elongate "S" shaped profile of FIG. 2.
  • the anchoring zone 2 is made by selective laser melting. This approach allows for example to provide reinforcements or beads in the anchoring zone, so as to make anchoring safer and more durable. Reference numbers used in the figures

Abstract

Disclosed is a blade (1) for the lining of a mold used for vulcanizing a tire tread, said blade comprising: - an anchoring portion (2) designed to anchor the blade (1) in a body (5) of the lining; - a molding portion (3) which is designed to mold at least one cut into the tire tread; - the molding region (3) being made using a first process, and the anchoring region (2) being made using a second process that is different from the first one.

Description

LAMELLE HYBRIDE DE GARNITURE D'UN MOULE POUR PNEUMATIQUE  HYBRID TRIM OF TRIM OF A MOLD FOR PNEUMATIC
DOMAINE TECHNIQUE DE L'INVENTION TECHNICAL FIELD OF THE INVENTION
[0001]La présente invention concerne une lamelle de garniture d'un moule pour la vulcanisation de pneumatique. The present invention relates to a sealing strip of a mold for tire vulcanization.
ETAT DE LA TECHNIQUE ANTERIEURE STATE OF THE PRIOR ART
[0002] Le document EP0868955 décrit un procédé de fabrication de pièces de moule utilisant la technique dite de fusion laser sélective (« Sélective Laser Melting » en anglais) dans lequel des éléments de garniture, tels que des lamelles, sont produits par fusion sélective d'une poudre formée de grains, à l'aide d'un faisceau laser. Ce procédé permet de construire des lamelles par superposition de couches de grains agglomérés par le faisceau laser. [0003]Un intérêt de cette technique est que la forme de la lamelle peut être modélisée par un ordinateur. Le laser peut être ainsi piloté par l'ordinateur pour former sélectivement les couches successives en respectant les dimensions de la lamelle modélisée. La construction de la lamelle se fait à partir d'un plateau dont la surface est généralement plane. Ce plateau sert de base pour la construction de la lamelle par couches successives. La première couche de grains agglomérés est formée directement sur le plateau.  EP0868955 discloses a method of manufacturing mold parts using the so-called selective laser melting technique ("Selective Laser Melting" in English) in which packing elements, such as lamellae, are produced by selective melting. a powder formed of grains, using a laser beam. This method makes it possible to construct lamellae by superposing layers of grains agglomerated by the laser beam. An advantage of this technique is that the shape of the slat can be modeled by a computer. The laser can thus be driven by the computer to selectively form the successive layers respecting the dimensions of the modeled lamella. The construction of the lamella is made from a plate whose surface is generally flat. This plate serves as a base for the construction of the lamella in successive layers. The first agglomerated grain layer is formed directly on the tray.
[0004]De par l'utilisation de la technique de fusion laser, cette première couche est soudée au plateau. Les autres couches de grains agglomérés sont ensuite formées successivement sur la première couche. Une fois la lamelle formée, il est nécessaire de la désolidariser du plateau. Cette opération de désolidarisation est généralement réalisée par une découpe par électro-érosion. By the use of the laser melting technique, this first layer is welded to the plate. The other layers of agglomerated grains are then formed successively on the first layer. Once the lamella is formed, it is necessary to separate it from the plate. This decoupling operation is generally performed by cutting by electro-erosion.
[0005]Cependant, la désolidarisation de la lamelle du plateau peut entraîner une déformation de ladite lamelle. En effet, à chaque formation d'une couche de grains agglomérés par fusion laser, il se crée des contraintes mécaniques particulières entre ladite couche et la couche précédemment formée. Lorsque la lamelle est désolidarisée du plateau, les contraintes mécaniques existantes entre les couches se modifient et peuvent entraîner une déformation de la lamelle. Par exemple, dans le cas où la lamelle se présente sous la forme d'une plaque de faible épaisseur, celle-ci peut se courber dans sa longueur et/ou sa largeur, une fois désolidarisée du plateau. L'empreinte laissée sur le pneumatique par une lamelle déformée peut alors ne pas correspondre à la sculpture désirée sur le pneumatique. [0006]Le document WO201 1 161248 décrit une lamelle pour une garniture d'un moule destiné à la vulcanisation d'une bande de roulement d'un pneumatique, ladite lamelle étant fabriquée par fusion sélective par laser. La lamelle comprend une partie d'ancrage configurée pour ancrer la lamelle dans un corps de la garniture, une partie de moulage configurée pour mouler au moins une découpure dans la bande de roulement du pneumatique. La lamelle comprend en outre des moyens de renfort entièrement présents au niveau de la partie d'ancrage de ladite lamelle. Dans la solution apportée par le document WO201 161248, c'est l'ensemble de la lamelle, c'est-à-dire la partie d'ancrage et la partie de moulage, qui est fabriquée par fusion sélective par laser. Le temps de fabrication de cette lamelle peut alors être allongé par rapport à un procédé de réalisation traditionnel, notamment si les renforts de la partie d'ancrage présentent une forme complexe. Les raidisseurs prévus sont parfois insuffisants pour régler les déformations de la zone de moulage. En outre, ils ne sont pas au bon endroit par rapport à la partie moulante. Il existe donc un besoin d'améliorer encore la rigidité de lamelles réalisées en tout ou partie par frittage laser. However, the separation of the plate of the plate can cause deformation of said blade. Indeed, at each formation of a layer of grains agglomerated by laser melting, particular mechanical stresses are created. between said layer and the previously formed layer. When the lamella is detached from the plate, the existing mechanical stresses between the layers change and can cause deformation of the lamella. For example, in the case where the strip is in the form of a thin plate, it can bend in its length and / or width, once disengaged from the plate. The impression left on the tire by a deformed sipe may then not correspond to the desired sculpture on the tire. WO201 1 161248 discloses a strip for a liner of a mold for vulcanizing a tread of a tire, said blade being manufactured by selective laser melting. The sipe includes an anchor portion configured to anchor the sipe in a liner body, a molding portion configured to mold at least one cut in the tread of the tire. The lamella further comprises reinforcing means entirely present at the anchoring portion of said lamella. In the solution provided by WO201 161248, it is the entire lamellae, that is to say the anchoring part and the molding part, which is manufactured by selective laser melting. The manufacturing time of this lamella can then be lengthened compared to a traditional production method, especially if the reinforcements of the anchoring portion have a complex shape. The stiffeners provided are sometimes insufficient to adjust the deformations of the molding area. In addition, they are not in the right place compared to the body part. There is therefore a need to further improve the rigidity of lamellae made in whole or in part by laser sintering.
[0007] Il existe donc un besoin d'optimiser la fabrication des lamelles dans leur ensemble. [0008]Pour pallier ces différents inconvénients, l'invention prévoit différents moyens techniques. EXPOSE DE L'INVENTION There is therefore a need to optimize the manufacture of the slats in their entirety. To overcome these disadvantages, the invention provides different technical means. SUMMARY OF THE INVENTION
[0009] Tout d'abord, un premier objet de l'invention consiste à prévoir une lamelle permettant de mettre en œuvre de profils très variés, incluant à la fois des profils complexes et des profils minces. [0009] Firstly, a first object of the invention is to provide a slat allowing to implement very varied profiles, including both complex profiles and thin profiles.
[0010]Un autre objet de l'invention consiste à prévoir une lamelle permettant d'optimiser les caractéristiques de bande de roulement des pneumatiques moulés. [0011]Encore un autre objet de l'invention consiste à prévoir une lamelle présentant des caractéristiques techniques facilitant sa fabrication. Another object of the invention is to provide a blade to optimize the tread characteristics of molded tires. Yet another object of the invention is to provide a slat having technical characteristics facilitating its manufacture.
[0012]Pour ce faire, l'invention prévoit une lamelle pour une garniture d'un moule destiné à la vulcanisation d'une bande de roulement d'un pneumatique, ladite lamelle comprenant : To do this, the invention provides a cover for a liner of a mold for vulcanizing a tread of a tire, said cover comprising:
- une partie d'ancrage configurée pour ancrer la lamelle dans un corps de la garniture ;  - An anchor portion configured to anchor the sipe in a body of the liner;
- une partie de moulage configurée pour mouler au moins une découpure dans la bande de roulement du pneumatique ;  a molding part configured to mold at least one cutout in the tread of the tire;
la zone de moulage étant réalisée selon un premier procédé et la zone d'ancrage étant réalisée selon un second procédé différent du premier. the molding zone being made according to a first method and the anchoring zone being made according to a second method different from the first one.
[0013]Grâce à cette agencement, les problèmes liés à la variation de section, qui sont à la source de déformations éventuelles, sont éliminés ou au moins sensiblement réduits. On obtient une excellente rigidité de la section de moulage. With this arrangement, the problems related to the section variation, which are at the source of possible deformations, are eliminated or at least substantially reduced. Excellent rigidity of the molding section is obtained.
[0014]Ce mode de réalisation permet de réaliser des lamelles hybrides dont certaines zones sont optimisées en fonction de profils pouvant être obtenus à l'aide d'un premier procédé, tandis qu'au moins une autre zone ne peut être réalisée convenablement que par un autre procédé. [0015]Selon un premier mode de réalisation avantageux, la zone de moulage est réalisée selon un procédé impliquant une fusion sélective par laser (la zone d'ancrage est de son côté réalisée par un procédé sans fusion sélective par laser). [0016]Ce mode de réalisation permet de réaliser des lamelles avec des zones de moulage dotées de profils complexes, tout en ayant des zones d'ancrage avec des profils plus simples, notamment des profils dotés de surface très minces, difficile à réaliser par fusion sélective par laser. [0017]Ce mode de réalisation permet de réaliser la partie à forte valeur ajoutée en procédé de fusion laser et la zone d'ancrage, plus simple, peut être réalisée en procédé traditionnel pour réduire les coûts, en particulier dans les cas où cette partie est standardisée. [0018]En outre, lorsqu'il y a des variations de sections importantes combinant des sections massives complexes et des sections fines, les solutions connues génèrent d'importantes contraintes et déformations sur les lamelles entièrement obtenues par fusion laser. L'assemblage de deux éléments de lamelles réalisés selon deux procédés différents permet d'éviter ces déformations. This embodiment makes it possible to produce hybrid slats, some areas of which are optimized according to profiles that can be obtained by means of a first method, while at least one other zone can be conveniently made only by another process. According to a first advantageous embodiment, the molding zone is produced by a process involving a selective laser melting (the anchoring zone is in turn realized by a method without selective laser melting). This embodiment allows for slats with molding areas with complex profiles, while having anchor zones with simpler profiles, including profiles with very thin surface, difficult to achieve by melting selective laser. This embodiment makes it possible to achieve the high added value part in the laser melting process and the anchoring zone, which is simpler, can be carried out in a traditional process in order to reduce costs, in particular in cases where this part is standardized. In addition, when there are large section variations combining complex massive sections and thin sections, the known solutions generate significant stresses and deformations on the strips completely obtained by laser melting. The assembly of two lamella elements made according to two different methods makes it possible to avoid these deformations.
[0019]Selon un second mode de réalisation avantageux, la zone d'ancrage est réalisée selon un procédé impliquant une fusion sélective par laser (la zone de moulage est de son côté réalisée par un procédé sans fusion sélective par laser). [0020]Ce second mode de réalisation permet de réaliser des lamelles avec des zones d'ancrage dotées de profils complexes, tout en ayant des zones de moulage avec des profils plus simples, notamment des profils dotés de surface très minces, impossible à réaliser par fusion sélective par laser. [0021]Selon une variante avantageuse, la lamelle comprend au moins une portion mince dont l'épaisseur est comprise entre 0,05 et 0,6mm et préférablement entre 0.1 et 0.4mm. [0022]Grâce aux caractéristiques des lamelles hybrides, la partie réalisée en procédé sans fusion sélective par laser (par exemple par emboutissage) permet d'atteindre des caractéristiques d'épaisseur particulièrement faibles, difficile à atteindre avec un procédé avec fusion sélective par laser. According to a second advantageous embodiment, the anchoring zone is made according to a method involving a selective laser melting (the molding zone is in turn carried out by a method without selective laser melting). This second embodiment allows for slats with anchor zones with complex profiles, while having molding areas with simpler profiles, including profiles with very thin surface, impossible to achieve by selective laser fusion. According to an advantageous variant, the lamella comprises at least one thin portion whose thickness is between 0.05 and 0.6 mm and preferably between 0.1 and 0.4 mm. With the characteristics of the hybrid lamellae, the part made in the process without selective melting by laser (for example by stamping) makes it possible to achieve particularly low thickness characteristics, which are difficult to achieve with a method with selective laser melting.
[0023]En variante, au moins une des parties de la lamelle est constituée en matière métallique ou composite. Alternatively, at least one of the parts of the strip is made of metal or composite material.
[0024] De manière avantageuse, l'assemblage de la zone de moulage et de la zone d'ancrage est réalisé soit par soudure, ou par goupillage ou par clipsage, ou par sertissage, ou par collage. En variante, l'assemblage de la zone de moulage et de la zone d'ancrage est réalisé par insertion de ces deux éléments dans une zone de fixation d'un moule. On réalise un pré-positionnement des deux parties de la lamelle et l'assemblage définitif se fait lors de l'ancrage dans l'aluminium du moule. Advantageously, the assembly of the molding zone and the anchoring zone is carried out either by welding, or by pinning or clipping, or by crimping, or by gluing. Alternatively, the assembly of the molding zone and the anchoring zone is performed by inserting these two elements in a mold fixing zone. Pre-positioning of the two parts of the lamella is carried out and the final assembly is done during the anchoring in the aluminum of the mold.
[0025]L'invention prévoit également un moule pour vulcanisation de pneumatiques, comportant une pluralité de lamelles telles que préalablement décrites. The invention also provides a mold for vulcanizing tires, comprising a plurality of strips as previously described.
DESCRIPTION DES FIGURES DESCRIPTION OF THE FIGURES
[0026]Tous les détails de réalisation sont donnés dans la description qui suit, complétée par les figures 1 à 2, présentées uniquement à des fins d'exemples non limitatifs, et dans lesquelles:  All the details of embodiment are given in the description which follows, supplemented by FIGS. 1 to 2, presented solely for purposes of non-limiting examples, and in which:
-la figure 1 est une vue en perspective d'un exemple d'une lamelle insérée dans un moule montré en coupe ; FIG 1 is a perspective view of an example of a lamella inserted in a mold shown in section;
-la figure 2 est une perspective d'un autre exemple de lamelle.  FIG 2 is a perspective of another example of lamella.
DESCRIPTION DETAILLEE DE L'INVENTION DETAILED DESCRIPTION OF THE INVENTION
[0027]La figure 1 illustre un exemple de réalisation d'une lamelle 1 pour une garniture d'un moule destiné à la vulcanisation d'une bande de roulement d'un pneumatique. Le corps 5 dans lequel la lamelle est insérée est montré en coupe transversale. On observe que la lamelle s'étend d'un côté à l'autre du corps 5 et qu'une partie, dite partie de moulage 3, est libre entre les deux cordons 8 du corps 5. La partie de la lamelle qui est logée dans les cordons 8 et la base 9 du corps 5 forme une partie d'ancrage 2. [0027] Figure 1 illustrates an embodiment of a strip 1 for a liner of a mold for vulcanizing a tread of a tire. The body 5 in which the lamella is inserted is shown in section cross. It is observed that the strip extends from one side to the other of the body 5 and that a part, called the molding part 3, is free between the two cords 8 of the body 5. The part of the lamella which is housed in the cords 8 and the base 9 of the body 5 forms an anchoring portion 2.
[0028] La partie de moulage 3 est configurée pour mouler au moins une découpure dans la bande de roulement du pneumatique. La partie d'ancrage 2 est configurée pour assurer le maintien de la lamelle 1 dans le corps 5 de la garniture. La partie de moulage 3 est fixée à la partie d'ancrage 2 par goupillage pour former un assemblage 6 en une seule pièce. The molding portion 3 is configured to mold at least one cut in the tread of the tire. The anchoring portion 2 is configured to maintain the lamella 1 in the body 5 of the liner. The molding portion 3 is fixed to the anchoring portion 2 by pinning to form an assembly 6 in one piece.
La figure 2 illustre un autre exemple de réalisation dans lequel la zone d'ancrage 2 est située sous l'axe A-A. Cette zone d'ancrage forme une portion mince 4 par rapport à la zone de moulage 3, par exemple comprise entre 0,05 et 0,3 mm. L'assemblage 6 entre les deux parties 2 et 3 est réalisé par soudure. D'autres modes de fixation sont possibles en variante, tel que des fixations par goupillage ou par clipsage, ou par sertissage. FIG. 2 illustrates another exemplary embodiment in which the anchoring zone 2 is located under the axis A-A. This anchoring zone forms a thin portion 4 with respect to the molding zone 3, for example between 0.05 and 0.3 mm. The assembly 6 between the two parts 2 and 3 is made by welding. Other modes of attachment are possible alternatively, such as fixing by pinning or clipping, or crimping.
[0029]Dans les exemples de réalisation illustrés, la zone de moulage 3 est réalisée selon un premier procédé et la zone d'ancrage 2 est réalisée selon un second procédé différent du premier. Par exemple, tel qu'illustré à la figure 2, la zone de moulage 3 est réalisée selon un procédé impliquant une fusion sélective par laser. Ce procédé permet de réaliser des formes ou profils complexes, tel que le profil en forme de « S » allongé de la figure 2. En variante, non illustrée, la zone d'ancrage 2 est réalisée par fusion sélective par laser. Cette approche permet par exemple de prévoir des renforts ou bourrelets dans la zone d'ancrage, de façon à rendre l'ancrage plus sûr et plus durable. Numéros de référence employés sur les figures In the exemplary embodiments illustrated, the molding zone 3 is made according to a first method and the anchoring zone 2 is made according to a second method different from the first one. For example, as illustrated in FIG. 2, the molding zone 3 is made according to a process involving selective laser melting. This method makes it possible to produce complex shapes or profiles, such as the elongate "S" shaped profile of FIG. 2. Alternatively, not illustrated, the anchoring zone 2 is made by selective laser melting. This approach allows for example to provide reinforcements or beads in the anchoring zone, so as to make anchoring safer and more durable. Reference numbers used in the figures
1 Lamelle 1 slat
2 Zone d'ancrage 2 Anchoring zone
3 Zone de moulage  3 Molding area
4 Portion mince  4 Thin portion
5 Corps de garniture  5 Trim body
6 Assemblage  6 Assembly
7 Bourrelet 7 Bead
8 Cordons  8 Cords
9 Base du corps  9 Base of the body

Claims

REVENDICATIONS
1 . Lamelle (1 ) pour une garniture d'un moule destiné à la vulcanisation d'une bande de roulement d'un pneumatique, ladite lamelle comprenant :  1. Lamella (1) for a molding of a mold for vulcanizing a tread of a tire, said lamella comprising:
- une partie d'ancrage (2) configurée pour ancrer la lamelle (1 ) dans un corps (5) de la garniture ;  - An anchor portion (2) configured to anchor the blade (1) in a body (5) of the liner;
- une partie de moulage (3) configurée pour mouler au moins une découpure dans la bande de roulement du pneumatique ;  a molding part (3) configured to mold at least one cut in the tread of the tire;
caractérisée en ce que la zone de moulage (3) est réalisée selon un premier procédé et la zone d'ancrage (2) est réalisée selon un second procédé différent du premier. characterized in that the molding zone (3) is formed according to a first method and the anchoring zone (2) is produced according to a second method different from the first one.
2. Lamelle (1 ) selon la revendication 1 , dans laquelle la zone de moulage (3) est réalisée selon un procédé impliquant une fusion sélective par laser. 2. Lamella (1) according to claim 1, wherein the molding zone (3) is made by a process involving selective laser melting.
3. Lamelle (1 ) selon la revendication 1 , dans laquelle la zone d'ancrage (2) est réalisée selon un procédé impliquant une fusion sélective par laser. 3. Lamella (1) according to claim 1, wherein the anchoring zone (2) is made by a process involving a selective laser melting.
4. Lamelle (1 ) selon l'une des revendications précédentes, comprenant au moins une portion mince (4) dont l'épaisseur est comprise entre 0,05 et 0,6 mm. 4. Lamella (1) according to one of the preceding claims, comprising at least one thin portion (4) whose thickness is between 0.05 and 0.6 mm.
5. Lamelle (1 ) selon l'une quelconque des revendications précédentes, dans laquelle au moins une des parties est constituée en matière métallique ou composite. 5. Lamella (1) according to any one of the preceding claims, wherein at least one of the parts is made of metallic material or composite.
6. Lamelle (1 ) selon l'une quelconque des revendications 1 à 5, dans laquelle l'assemblage (6) de la zone de moulage (3) et de la zone d'ancrage (2) est réalisé soit par soudure, ou par goupillage ou par clipsage, ou par sertissage ou collage. 6. Lamella (1) according to any one of claims 1 to 5, wherein the assembly (6) of the molding zone (3) and the anchoring zone (2) is carried out either by welding, or by pinning or clipping, or crimping or gluing.
7. Lamelle (1 ) selon l'une quelconque des revendications 1 à 5, dans laquelle l'assemblage de la zone de moulage et de la zone d'ancrage est réalisé par insertion de ces deux éléments dans une zone de fixation d'un moule. 7. lamella (1) according to any one of claims 1 to 5, wherein the assembly of the molding zone and the anchoring zone is formed by insertion of these two elements in a fixing zone of a mold.
8. Moule pour vulcanisation de pneumatique, comportant une pluralité de lamelles (1 ) selon l'une des revendications 1 à 7. Tire vulcanization mold, comprising a plurality of lamellae (1) according to one of claims 1 to 7.
EP17745836.1A 2016-07-18 2017-07-05 Hybrid blade for the lining of a tire mold Withdrawn EP3484683A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1670387A FR3053919A1 (en) 2016-07-18 2016-07-18 HYBRID TRIM OF TRIM OF A MOLD FOR PNEUMATIC
PCT/FR2017/051830 WO2018015630A1 (en) 2016-07-18 2017-07-05 Hybrid blade for the lining of a tire mold

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DE102018204024A1 (en) * 2018-03-16 2019-09-19 Continental Reifen Deutschland Gmbh Rib or lamellar element, profile ring segment and method for producing a profile ring segment
FR3105080B1 (en) * 2019-12-19 2022-11-11 Michelin & Cie Curing mold for tires provided with a venting device and associated curing method

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IT1290210B1 (en) * 1997-01-29 1998-10-22 Pirelli METHOD FOR THE PRODUCTION OF TIRES, FOR THE REALIZATION OF VULCANIZATION MOLDS FOR SAID TIRES, TIRES AND MOLDS SO
ES2195126T3 (en) * 1997-10-27 2003-12-01 Goodyear Tire & Rubber ARTICLE AND METHOD FOR COMPOSITE SHEETS FOR TIRE MOLDS.
US20020134202A1 (en) * 2001-03-23 2002-09-26 Andre Domange Composite blade
AT507479B1 (en) 2009-11-19 2011-07-15 Avl List Gmbh CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE
FR2961741B1 (en) * 2010-06-25 2012-08-03 Michelin Soc Tech LAMELLE FOR A TRIM OF A MOLD FOR THE VULCANIZATION OF A TIRE TREAD OF A TIRE

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WO2018015630A1 (en) 2018-01-25
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