EP2442969A1 - Method for determining the transverse curve of a generally cylindrical receiving surface - Google Patents

Method for determining the transverse curve of a generally cylindrical receiving surface

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Publication number
EP2442969A1
EP2442969A1 EP10725167A EP10725167A EP2442969A1 EP 2442969 A1 EP2442969 A1 EP 2442969A1 EP 10725167 A EP10725167 A EP 10725167A EP 10725167 A EP10725167 A EP 10725167A EP 2442969 A1 EP2442969 A1 EP 2442969A1
Authority
EP
European Patent Office
Prior art keywords
wire
turn
zero
tension
tire
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Withdrawn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
EP10725167A
Other languages
German (de)
French (fr)
Inventor
Philippe Tramond
Jean-Yves Denoueix
Bernard Guerinon
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
Michelin Recherche et Technique SA France
Original Assignee
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
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 Michelin Recherche et Technique SA Switzerland, Michelin Recherche et Technique SA France, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
Publication of EP2442969A1 publication Critical patent/EP2442969A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/242—Drums for manufacturing substantially cylindrical tyre components without cores or beads, e.g. treads or belts
    • 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)
    • B29D30/70—Annular breakers

Definitions

  • the invention relates to the field of the manufacture of tires, and in particular that of the assembly of the components forming the crown of the tire.
  • the assembly of the crown reinforcement plies and the tread is performed on a receiving surface, also called vertex shape, whose axial profile, or curve, is generally cylindrical.
  • the vertex shape is composed of a set of radially movable elements for adjusting the diameter of the shape between an expanded position used during the assembly phase and a retracted position for extracting the annular element obtained at the end of this phase of construction of the tire.
  • the peaks of modern tires usually comprise reinforcing plies forming an angle with the circumferential direction a reinforcement ply composed of circumferentially wound son and said zero-degree ply or zero-degree thread, and a tread capping the together. Once formed, this annular element is transferred to the portion of the tire comprising the carcass reinforcement ply and the reinforcing rings of the beads, to which a generally toroidal shape has been imparted. The assembly then constitutes a bandage intended to be placed in a baking press for the vulcanization operation.
  • the object of the invention is to provide an alternative solution to shrinking under tension son zero degree by acting on the transverse curve of the receiving surface of generally cylindrical shape for the assembly of the blank of a tire, to receive the components forming a crown belt.
  • the method of determining the curve of the receiving surface according to the invention comprises the following steps during which:
  • the initial radial position is determined so that the wire of the turn considered undergoes the desired rate of elongation during the press conformation; determines, at the axial location of said turn, the transverse profile of the receiving surface by subtracting from the initial position of the wire the thickness of the components arranged radially inside the turn of said zero-degree wire.
  • the cooking means generally formed by an expandable membrane, will force the crown area to penetrate into the part of the mold with the sculptures.
  • the radial displacements imposed on the zero-degree wires will be greater or smaller depending on the laying diameter of these wires during the assembly phase of the top, which depends on the laying diameter, the surface profile pose of the summit form. These displacements determine the rate of conformation in press.
  • Figure 2 shows a radial sectional view of a crown assembly shape having a double concavity.
  • the crown assembly form 2 illustrated in FIG. 1 comprises a laying surface 21 on which a tire crown 1 has been shown during assembly, comprising a first crown reinforcement ply 11 and a second reinforcing ply.
  • These crown reinforcing plies are generally formed of reinforcing threads forming an angle with the circumferential direction.
  • the top also comprises reinforcement son 13i wound to zero degree without tension.
  • the transverse profile of the receiving surface for receiving the components forming the crown belt 2, defined as a function of the distance Rfdp from the surface to the axis of rotation of the assembly form, has a generally concave whose concavity is oriented radially inward of the assembly form. This configuration can be useful when one seeks to give a greater tension to the shoulders than in the center, considering that the transverse profile of the mold in the crown zone is substantially flat.
  • any wire to zero degrees can be determined according to its axial position the final radius Rf of the wire (in the stressed state) corresponding to the final position of the wire at this point when the tire is fitted into the mold of cooking and Ri the initial radius of the hoop (radius of installation of the hoop in the unconstrained state)
  • e the thickness (the distance) separating said wire from the finishing drum.
  • E represents the thickness of the products laid radially under the wire under consideration.
  • the vertex assembly form 3 illustrated in Figure 2 has a laying surface comprising the combination of two concavities in opposite directions.
  • the two axially opposite wings 31 have a concavity oriented towards the inside of the assembly form, while the central portion 32 located at the equator of the assembly form has a concavity facing outwards of the Summit shape.
  • This profile therefore has at least one inflection point and, as a rule, at least an even number of inflection points due to the symmetry of the tire, making it possible to connect these different concavity curves.
  • This profile allows pre-tensioning of the shoulder wires to improve the speed limit performance, and pre-tensioning the zero-degree wires in the equator area of the tire to improve performance. in wear.
  • the latter solution has the advantage of giving greater industrial flexibility by allowing the creation of laying forms with carefully determined standard profiles, and on which one adjusts finely the laying tension of the wires to zero degrees to obtain the desired pre-tension.

Abstract

The invention relates to a method for determining the transverse curve of a generally cylindrical receiving surface intended, during the assembly of a tyre blank, for receiving the components forming a top belt in which wires are arranged at zero degrees in relation to the longitudinal direction, said wires being wound continuously without tension, in which: the elongation rate (A) to be applied to a turn of a zero-degree wire is calculated according to the required pre-tension (A=f(T)), according to the axial position thereof in the tyre; according to the radial position (Rf) of the wire of said turn in the tyre fitted into the mould thereof, the initial radial position (Ri = Rf/(1 +A)) is determined such that the required elongation rate is applied to wire of the turn in question during the shaping thereof in the press; the transverse profile (Rfdp) of the receiving surface is determined, at the axial location of said turn, by subtracting from the initial position of the wire (Ri) the thickness (e) of the components radially arranged inside the turn of said zero-degree wire (Rfdp=Rf/(1 +f(T)) - e).

Description

PROCEDE DE DETERMINATION DU GALBE TRANSVERSAL D ' UNE SURFACE DE RECEPTION DE METHOD FOR DETERMINING THE TRANSVERSE GALV OF A RECEPTION SURFACE OF
FORME GENERALEMENT CYLINDRIQUEGENERALLY CYLINDRICAL SHAPE
[001] L'invention concerne le domaine de la fabrication des pneumatiques, et en particulier celui de l'assemblage des composants formant le sommet du pneumatique.[001] The invention relates to the field of the manufacture of tires, and in particular that of the assembly of the components forming the crown of the tire.
[002] De manière courante, l'assemblage des nappes de renfort sommet et de la bande de roulement s'effectue sur une surface de réception, également dénommée forme sommet, dont le profil axial, ou galbe, est généralement cylindrique.[002] Commonly, the assembly of the crown reinforcement plies and the tread is performed on a receiving surface, also called vertex shape, whose axial profile, or curve, is generally cylindrical.
[003] La forme sommet est composée d'un ensemble d'éléments mobiles radialement permettant d'ajuster le diamètre de la forme entre une position expansée utilisée pendant la phase d'assemblage et une position rétractée permettant d'extraire l'élément annulaire obtenu à l'issue de cette phase de construction du pneumatique.[003] The vertex shape is composed of a set of radially movable elements for adjusting the diameter of the shape between an expanded position used during the assembly phase and a retracted position for extracting the annular element obtained at the end of this phase of construction of the tire.
[004] Les sommets des pneumatiques modernes comportent usuellement des nappes de renfort formant un angle avec la direction circonférentielle une nappe de renfort composées de fils enroulés circonférentiellement et dite nappe à zéro degré ou fils à zéro degré, et une bande de roulement coiffant l'ensemble. Une fois constitué, cet élément annulaire est transféré sur la partie du pneumatique comprenant la nappe de renfort carcasse et les anneaux de renfort des talons, à laquelle a été conférée une forme généralement toroïdale. L'ensemble constitue alors un bandage destiné à être placé dans une presse de cuisson pour l'opération de vulcanisation.[004] The peaks of modern tires usually comprise reinforcing plies forming an angle with the circumferential direction a reinforcement ply composed of circumferentially wound son and said zero-degree ply or zero-degree thread, and a tread capping the together. Once formed, this annular element is transferred to the portion of the tire comprising the carcass reinforcement ply and the reinforcing rings of the beads, to which a generally toroidal shape has been imparted. The assembly then constitutes a bandage intended to be placed in a baking press for the vulcanization operation.
[005] Afin d'améliorer les performances du pneumatique, il est de pratique usuelle de faire varier la tension des fils formant la nappe à zéro degré. Ainsi, pour accroître la vitesse limite acceptable par le pneumatique, on cherchera à augmenter la pré-tension des fils à zéro degré situés en zone épaule, et pour améliorer la résistance à l'usure, on augmente la pré-tension des fils à zéro degré situés dans la zone centrale.[005] In order to improve the performance of the tire, it is customary practice to vary the tension of the threads forming the web to zero degrees. Thus, in order to increase the acceptable speed limit by the tire, it will be sought to increase the pre-tension of the zero-degree wires located in the shoulder zone, and to improve the wear resistance, the pre-tension of the wires is increased to zero. degree located in the central area.
[006] A cet effet, de nombreux moyens de pose des fils à zéro degré en tension ont été développés par les manufacturiers de pneumatiques permettant de faire varier la tension de frettage en fonction de la position axiale du fil à zéro degré à poser.[006] For this purpose, many laying means of zero-degree voltage son have been developed by tire manufacturers to vary the shrinking tension depending on the axial position of the zero-degree wire to ask.
[007] Toutefois, on observe que, lorsque l'on cherche à conférer au fil à zéro degré une tension importante, ces contraintes, combinées à l'élasticité des fils, ont pour effet, lorsque l'on libère le bandage de la machine d'assemblage, de provoquer un effondrement radial du sommet, ayant pour conséquence la formation de plis et le déplacement relatif des produits formant le sommet.[007] However, it is observed that, when one seeks to give the wire to zero degrees a significant voltage, these constraints, combined with the elasticity of the son, have the effect, when one releases the bandage of the machine assembly, to cause a radial collapse of the top, resulting in the formation of folds and the relative displacement of the products forming the top.
[008] L'objet de l'invention est de proposer une solution alternative au frettage sous tension des fils à zéro degré en agissant sur le galbe transversal de la surface de réception de forme généralement cylindrique destinée, lors de l'assemblage de l'ébauche d'un pneumatique, à recevoir les composants formant une ceinture sommet.[008] The object of the invention is to provide an alternative solution to shrinking under tension son zero degree by acting on the transverse curve of the receiving surface of generally cylindrical shape for the assembly of the blank of a tire, to receive the components forming a crown belt.
[009] Le procédé de détermination du galbe de la surface de réception selon l'invention comprend les étapes suivantes qu cours desquelles :[009] The method of determining the curve of the receiving surface according to the invention comprises the following steps during which:
- on détermine le taux d'allongement (A) nécessaire à faire subir selon la pré tension désirée à une spire de fil à zéro degré, en fonction de sa position axiale dans le pneumatique,the rate of elongation (A) necessary to subject, according to the desired pre-tension, to a turn of wire at zero degrees, as a function of its axial position in the tire, is determined,
- en fonction de la position radiale du fil de ladite spire dans le pneumatique emboîté dans son moule, on détermine la position radiale initiale pour que le fil de la spire considérée subisse le taux d'allongement désiré lors de la conformation en presse, - on détermine, à l'emplacement axial de ladite spire, le profil transversal de la surface de réception en retranchant de la position initiale du fil l'épaisseur des composants disposés radialement à l'intérieur de la spire dudit fil à zéro degré.as a function of the radial position of the wire of said turn in the tire fitted into its mold, the initial radial position is determined so that the wire of the turn considered undergoes the desired rate of elongation during the press conformation; determines, at the axial location of said turn, the transverse profile of the receiving surface by subtracting from the initial position of the wire the thickness of the components arranged radially inside the turn of said zero-degree wire.
[010] On entend ici par spire de fil un portion du fil correspondant à un tour complet du fil. [011] De cette manière, la pose des fils à zéro degré peut se faire à tension constante et relativement peu élevée de manière à éviter les inconvénients signalés ci-dessus.[010] Here is meant by wire turn a portion of the wire corresponding to a complete turn of the wire. In this way, the laying of zero degree wires can be done at constant voltage and relatively low so as to avoid the disadvantages mentioned above.
[012] Une fois le bandage en presse, les moyens de cuisson, en général formés par une membrane expansible, vont forcer la zone sommet à pénétrer dans la partie du moule comportant les sculptures. Au cours de cette opération, les déplacements radiaux imposés aux fils à zéro degré vont être plus ou moins importants selon le diamètre de pose de ces fils lors de la phase d'assemblage du sommet, lequel diamètre de pose dépendant, du profil de la surface de pose de la forme sommet. Ces déplacements déterminent le taux de conformation en presse.Once the bandage is pressed, the cooking means, generally formed by an expandable membrane, will force the crown area to penetrate into the part of the mold with the sculptures. During this operation, the radial displacements imposed on the zero-degree wires will be greater or smaller depending on the laying diameter of these wires during the assembly phase of the top, which depends on the laying diameter, the surface profile pose of the summit form. These displacements determine the rate of conformation in press.
[013] Ainsi, en jouant sur la loi force/allongement du fil de renfort à zéro degré, et en connaissant le profil transversal de la surface de pose, et le profil du moule, on peut en déduire le taux d'allongement en tout point subit par le fil à zéro degré entre la phase d'assemblage et l'opération de moulage, et calculer ainsi la précontrainte conférée au fil lors de la conformation du bandage dans la presse de cuisson.[013] Thus, by playing on the force / elongation of the reinforcement wire to zero degrees, and knowing the transverse profile of the laying surface, and the profile of the mold, we can deduce the elongation rate in all point suffered by the wire at zero degrees between the assembly phase and the molding operation, and thus calculate the prestress given to the wire during the conformation of the bandage in the baking press.
[014] La description qui suit s'appuie sur un exemple de réalisation permettant de mieux comprendre les modes particuliers de mise en oeuvre de l'invention, et sur les figures 1 et 2 dans lesquelles : - la figure 1 représente une vue en coupe radiale d'une forme d'assemblage sommet présentant une concavité orientée radialement vers l'intérieur.[014] The following description is based on an exemplary embodiment to better understand the particular modes of implementation of the invention, and in Figures 1 and 2 wherein: - Figure 1 shows a sectional view radial of a vertex assembly shape having a concavity oriented radially inwardly.
La figure 2 représente une vue en coupe radiale d'une forme d'assemblage sommet présentant une double concavité.Figure 2 shows a radial sectional view of a crown assembly shape having a double concavity.
[015] La forme d'assemblage sommet 2 illustrée à la figure 1 comprend une surface de pose 21 sur laquelle a été représenté un sommet 1 de pneumatique en cours d'assemblage comportant une première nappe de renfort sommet 11 et une deuxième nappe de renfort sommet 12. Ces nappes de renfort sommet sont en règle générale formées de fils de renfort faisant un angle avec la direction circonférentielle.The crown assembly form 2 illustrated in FIG. 1 comprises a laying surface 21 on which a tire crown 1 has been shown during assembly, comprising a first crown reinforcement ply 11 and a second reinforcing ply. These crown reinforcing plies are generally formed of reinforcing threads forming an angle with the circumferential direction.
[016] Le sommet comporte également des fils de renfort 13i enroulés à zéro degré sans tension.[016] The top also comprises reinforcement son 13i wound to zero degree without tension.
[017] Lorsque l'ébauche de pneumatique est emboîtée dans le moule l'ensemble est coiffé par une bande de roulement 14. Les nappes de renfort et en particulier la nappe de renfort à zéro degré sont alors placées dans leur position finale 13f.[017] When the tire blank is fitted into the mold the assembly is capped by a tread 14. The reinforcing plies and in particular the zero degree reinforcement ply are then placed in their final position 13f.
[018] Le profil transversal de la surface de réception destinée à recevoir les composants formant la ceinture sommet 2, définit comme une fonction de la distance Rfdp de la surface à l'axe de rotation de la forme d'assemblage, présente un galbe généralement concave dont la concavité est orientée radialement vers l'intérieur de la forme d'assemblage. Cette configuration peut s'avérer utile lorsque l'on cherche à donner une tension plus importante aux épaules qu'au centre, en considérant que le profil transversal du moule dans la zone sommet est sensiblement plat.[018] The transverse profile of the receiving surface for receiving the components forming the crown belt 2, defined as a function of the distance Rfdp from the surface to the axis of rotation of the assembly form, has a generally concave whose concavity is oriented radially inward of the assembly form. This configuration can be useful when one seeks to give a greater tension to the shoulders than in the center, considering that the transverse profile of the mold in the crown zone is substantially flat.
[019] On notera ici que, en règle générale, le profil transversal du moule en fond de sculpture présente lui-même un galbe qui doit être pris en considération, comme cela a été dit plus haut dans le calcul du profil de la surface de pose de la forme d'assemblage sommet.[019] It will be noted here that, as a rule, the transverse profile of the mold in the bottom of the sculpture itself has a curve which must be taken into consideration, as was said above in the calculation of the profile of the surface of pose of the summit assembly form.
[020] Pour tout fil à zéro degré on peut déterminer en fonction de sa position axiale le rayon final Rf du fil (à l'état contraint) correspondant à la position finale du fil en ce point lorsque le pneumatique est emboité dans le moule de cuisson et Ri le rayon initial de la frette (rayon de pose de la frette à l'état non contraint)[020] For any wire to zero degrees can be determined according to its axial position the final radius Rf of the wire (in the stressed state) corresponding to the final position of the wire at this point when the tire is fitted into the mold of cooking and Ri the initial radius of the hoop (radius of installation of the hoop in the unconstrained state)
[021] Soit e, l'épaisseur (la distance) séparant ledit fil du tambour de finition. E représente l'épaisseur des produits posés radialement sous le fil considéré.[021] Let e be the thickness (the distance) separating said wire from the finishing drum. E represents the thickness of the products laid radially under the wire under consideration.
[022] Soit T la tension de ce fil à l'état final (tension donnée par la loi de tension que l'on désire obtenir), et soit f(T) la courbe caractéristique du fil à zéro degré considéré qui donne l'allongement A (généralement en %) du fil correspondant à un niveau de tension T dans lequel A est une fonction de T ; A = f(T).[022] Let T be the tension of this wire in the final state (voltage given by the voltage law that one wishes to obtain), and let f (T) be the characteristic curve of the wire at zero degree considered which gives the elongation A (generally in%) of the wire corresponding to a voltage level T in which A is a function of T; A = f (T).
[023] On désigne par Rfdp le rayon de la surface de réception que l'on veut déterminer. [024] On a alors la relation Rf = Ri + AxRi, avec AxRi qui désigne le taux de conformation en presse que doit subir le fil afin d'être dans l'état de contrainte désiré.[023] Rfdp denotes the radius of the receiving surface that is to be determined. [024] We then have the relationship Rf = Ri + AxRi, with AxRi which designates the press conformation rate that the wire must undergo in order to be in the desired state of stress.
[025] On en déduit que Ri = Rf / (1 +A) = Rf / (1 +f(T)). Avec Rfdp = Ri - e. Il en résulte que Rfdp = Rf / (1 +f(T)) - e[025] It follows that Ri = Rf / (1 + A) = Rf / (1 + f (T)). With Rfdp = Ri - e. As a result, Rfdp = Rf / (1 + f (T)) - e
[026] La forme d'assemblage sommet 3 illustrée à la figure 2 présente une surface de pose comportant la combinaison de deux concavités de sens opposées. Les deux ailes axialement opposées 31 , ont une concavité orientée vers l'intérieur de la forme d'assemblage, alors que la partie centrale 32 située à l'équateur de la forme d'assemblage, présente une concavité orientée vers l'extérieur de la forme sommet. Ce profil présente donc au moins un point d'inflexion et, en règle générale, au moins un nombre pair de points d'inflexion en raison de la symétrie du pneumatique, permettant de raccorder ces courbes de concavité différentes.[026] The vertex assembly form 3 illustrated in Figure 2 has a laying surface comprising the combination of two concavities in opposite directions. The two axially opposite wings 31 have a concavity oriented towards the inside of the assembly form, while the central portion 32 located at the equator of the assembly form has a concavity facing outwards of the Summit shape. This profile therefore has at least one inflection point and, as a rule, at least an even number of inflection points due to the symmetry of the tire, making it possible to connect these different concavity curves.
[027] Ce profil permet de conférer une pré-tension aux fils situés aux épaules pour améliorer la performance en vitesse limite, et de donner une pré-tension aux fils à zéro degré dans la zone de l'équateur du pneumatique pour améliorer la performance en usure.[027] This profile allows pre-tensioning of the shoulder wires to improve the speed limit performance, and pre-tensioning the zero-degree wires in the equator area of the tire to improve performance. in wear.
[028] II va de soi que l'homme de l'art saura adapter le galbe de la surface de pose selon des profils aussi variés que les besoins de performance du pneumatique se feront sentir.[028] It goes without saying that those skilled in the art will adapt the curve of the laying surface in profiles as varied as the performance needs of the tire will be felt.
[029] De même, il demeure évident de combiner les effets liés à la géométrie de la surface de pose comme cela vient d'être décrit ci-dessus, aux effets liés à la pose en tension du fil de renfort à zéro degré comme cela est pratiqué couramment dans l'industrie. On obtiendra ainsi un renforcement des valeurs de pré-tension conférées au fil à zéro degré tout en limitant la tension de pose du fil de manière à éviter les effets néfastes décrits en introduction de ce document.[029] Similarly, it remains obvious to combine the effects related to the geometry of the laying surface as just described above, to the effects related to the tensioning of the reinforcing wire to zero degrees like this. is commonly practiced in the industry. This will result in a reinforcement of the pre-tension values imparted to the wire at zero degrees while limiting the laying tension of the wire so as to avoid the adverse effects described in the introduction to this document.
[030] De plus, cette dernière solution présente l'avantage de conférer une plus grande souplesse industrielle en autorisant la création de formes de pose ayant des profils standard soigneusement déterminés, et sur lesquelles on ajuste finement la tension de pose des fils à zéro degré pour obtenir la pré-tension désirée. [030] In addition, the latter solution has the advantage of giving greater industrial flexibility by allowing the creation of laying forms with carefully determined standard profiles, and on which one adjusts finely the laying tension of the wires to zero degrees to obtain the desired pre-tension.

Claims

REVENDICATIONS
1 ) Procédé de détermination du galbe transversal d'une surface de réception (21 ) de forme généralement cylindrique destinée, lors de l'assemblage de l'ébauche d'un pneumatique, à recevoir les composants (11 , 12, 13, 14) formant une ceinture sommet dans laquelle sont des fils disposés à zéro degré (13) par rapport à la direction longitudinale, lesdits fils étant enroulés en continu sans tension, dans lequel :1) Method for determining the transverse curve of a reception surface (21) of generally cylindrical shape intended, during the assembly of the blank of a tire, to receive the components (11, 12, 13, 14) forming a crown belt in which there are threads arranged at zero degrees (13) with respect to the longitudinal direction, said threads being wound continuously without tension, in which:
- on détermine le taux d'allongement (A) nécessaire à faire subir selon la pré-tension désirée (A=f(T)) à une spire de fil à zéro degré, en fonction de sa position axiale dans le pneumatique,the rate of elongation (A) necessary to cause a zero-degree turn of wire to be subjected to the desired pre-tension (A = f (T)) is determined as a function of its axial position in the tire,
- en fonction de la position radiale (Rf) du fil de ladite spire dans le pneumatique emboîté dans son moule, on détermine la position radiale initiale (Ri = Rf/(1 +A)) pour que le fil de la spire considérée subisse le taux d'allongement désiré lors de la conformation en presse,as a function of the radial position (Rf) of the wire of said turn in the tire fitted into its mold, the initial radial position (Ri = Rf / (1 + A)) is determined so that the wire of the turn considered undergoes the rate of elongation desired during the press conformation,
- on détermine, à l'emplacement axial de ladite spire, le profil transversal (Rfdp) de la surface de réception en retranchant de la position initiale du fil (Ri) l'épaisseur (e) des composants disposés radialement à l'intérieur de la spire dudit fil à zéro degréat the axial location of said turn, the transverse profile (Rfdp) of the receiving surface is determined by subtracting from the initial position of the wire (Ri) the thickness (e) of the components arranged radially inside the the turn of said wire to zero degrees
(Rfdp=Rf/(1 +f(T)) - e).(Rfdp = Rf / (1 + f (T)) - e).
2) Procédé selon la revendication 1 dans lequel la tension des enroulements de fils varie axialement de sorte que le galbe transversal de la forme de réception présente au moins une concavité orientée radialement vers l'extérieur (11 ).2) The method of claim 1 wherein the voltage of the wire windings varies axially so that the transverse curve of the receiving shape has at least one concavity oriented radially outwardly (11).
3) Procédé selon la revendication 2 dans lequel la tension des enroulements de fils varie axialement de sorte que le galbe transversal de la forme de réception présente au moins une concavité orientée radialement vers l'intérieur (31 ). 3) The method of claim 2 wherein the voltage of the wire windings varies axially so that the transverse curve of the receiving shape has at least one concavity oriented radially inwards (31).
EP10725167A 2009-06-19 2010-06-14 Method for determining the transverse curve of a generally cylindrical receiving surface Withdrawn EP2442969A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0902998 2009-06-19
PCT/EP2010/058297 WO2010146011A1 (en) 2009-06-19 2010-06-14 Method for determining the transverse curve of a generally cylindrical receiving surface

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EP2442969A1 true EP2442969A1 (en) 2012-04-25

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EP (1) EP2442969A1 (en)
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CN (1) CN102802927A (en)
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WO (1) WO2010146011A1 (en)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
BR112015032608B1 (en) 2013-08-01 2021-01-12 Pirelli Tyre S.P.A. process and apparatus for making tires for vehicle wheels, and, tire for vehicle wheels
JP6333682B2 (en) * 2014-09-04 2018-05-30 住友ゴム工業株式会社 Tire molding former and tire molding method
CN112848807A (en) * 2021-01-29 2021-05-28 山东玲珑轮胎股份有限公司 Curved surface laminating drum design method and curved surface laminating drum

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0524702B1 (en) * 1987-06-18 1995-08-23 Sumitomo Rubber Industries Limited Pneumatic radial tyre
JP3083862B2 (en) * 1991-03-05 2000-09-04 株式会社ブリヂストン Pneumatic tires for motorcycles
JPH0757537B2 (en) * 1991-03-20 1995-06-21 株式会社森鐵工所 Device for driving movable part in tire building drum device and tire building drum device using the same
DE4239270A1 (en) * 1992-11-23 1994-05-26 Siemens Ag Process for actuator identification in the cross-profile control of a continuously generated material web
AU655553B2 (en) * 1993-03-15 1994-12-22 Bridgestone Corporation Pneumatic radial tires
JP3445348B2 (en) * 1993-03-15 2003-09-08 株式会社ブリヂストン Pneumatic radial tire
JP3397387B2 (en) * 1993-08-09 2003-04-14 株式会社ブリヂストン Manufacturing method of pneumatic radial tire
US6336985B1 (en) * 1997-07-31 2002-01-08 Pirelli Coordinamento Pneumatici S.P.A. Method for making a tire for vehicle wheels
FR2887809A1 (en) * 2005-06-30 2007-01-05 Michelin Soc Tech PNEUMATIC FOR HEAVY VEHICLES
DE102005047223A1 (en) * 2005-10-01 2007-04-05 Continental Aktiengesellschaft Pneumatic vehicle tire and method for manufacturing a pneumatic vehicle tire
JP2007307976A (en) * 2006-05-17 2007-11-29 Bridgestone Corp Pneumatic tire and its manufacturing method
EP1867467B1 (en) * 2006-06-16 2009-04-15 Societe de Technologie Michelin Method of applying a carcass reinforcing ply.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010146011A1 *

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CN102802927A (en) 2012-11-28
BRPI1014941A2 (en) 2016-04-26
WO2010146011A1 (en) 2010-12-23
JP2012530004A (en) 2012-11-29
US20120192637A1 (en) 2012-08-02

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