• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a mold element (18) to be mounted in a mold (10) for vulcanizing tires, the mold member (18) being in the form of a skin having a thickness (E) between 0.25 and 6 mm and comprising a bearing surface (20) with, on the opposite side, a molding surface (22) for forming all or part of the outer surface of said tire. The mold member has a pattern (30) comprising a plurality of recessed (19, 21, 112) or protuberant (106, 107) elements integral with said mold member (18).
    公开号:FR3022830A1
    申请号:FR1401466
    申请日:2014-06-30
    公开日:2016-01-01
    发明作者:Anthony Gueugneau；Stephane Montzieux；Etienne Blanchet
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；
    IPC主号:
    专利说明:

    [0001] BACKGROUND OF THE INVENTION The present invention relates to a tire mold element comprising a bearing surface and, on the contrary, a molding surface for forming the outer surface of said tire. STATE OF THE PRIOR ART The surface of the tires supports a large amount of markings intended on the one hand to give technical information on the quality of the tire, and on the other hand to enable the consumer to distinguish the mark and the origin of the product. These markings are, as a rule, obtained by relief patterns disposed on the surface of the tire and correspond to recessed patterns formed on the molding surface. Usually, the vulcanization molds are made of metal with a very good surface finish appearance. But the resulting outer surface, smooth and black, has the effect of returning the light. [0003] WO2007 / 045425 describes particular types of textures with high contrast on the tire. These textures have the main effect of trapping the incident light and, by absorption of light, to give a black and matt aspect to a portion of the tire. This absorption of light makes it possible to obtain a more intense black color and forming a better contrast with the rest of the surface of the tire. The contrast is even more important when the texture rubs against glossy surfaces on the tire. The contrast obtained by this absorption of light produces a noticeable visual effect on the finish of the product, often related to the visual appearance of velvet. P10-3376 - 2 - However, obtaining the textures producing such an effect is still a technological challenge that is only partially solved. Indeed, the current methods are relatively expensive and tedious to implement, and can produce only certain types of patterns, in some places, generally easy to access. The patent application WO 2010/076502 proposes a tire mold lining assembly comprising a skin. The skin is delimited by a first and a second opposite surface, the first surface being intended to be in contact with a support block of a tire mold, and a plurality of lining elements projecting from the second surface of the skin. , these elements being intended to form sculptures of a portion of a radially outer surface of a tire. Such an assembly makes it possible to obtain conventional sculptures such as those of the tread of conventional tires. There is now a need for solutions to produce tires with intense black textures with great flexibility and advantageous costs. To overcome these disadvantages, the invention provides different technical means.
    [0002] SUMMARY OF THE INVENTION [0008] Firstly, a first object of the invention is to provide a molding system or mold element allowing use on a wide variety of tires, and making it possible to produce different types of patterns. or textures. Another object of the invention is to provide a molding system or mold element that can be obtained at costs and following competitive production times. Another object of the invention is to provide a molding system or mold element to have patterns without restriction of positioning in the mold, to obtain on the tire particular textures on the surface of the tread, for example a pile-like texture, or a particular graphic marking. [0011] Yet another object of the invention is to provide a molding system or mold element for easily and quickly changing the configuration of a mold to produce a tire with one or more different textures. [0012] To this end, the invention provides a mold element intended to be mounted in a mold for vulcanizing tires, the mold element having the shape of a skin having a thickness of between 0.25 and 6 mm. The skin comprises a bearing surface and, on the opposite side, a molding surface, intended to form all or part of the outer surface of said tire. The mold member comprises a pattern comprising a plurality of recessed or protuberant members integral with said mold member. Such a mold element provided with these features has the particular advantage of being able to be manufactured in masked time, without requiring laser machining operations subsequent to those required for the conformation of the element itself, since the whole is generated from operations of the same nature, from the beginning to the end of the production of the part. No machining operation performed on the finished part does not weaken or tarnish it. According to an advantageous embodiment, the depth of the hollow elements is less than or equal to 30% of the thickness of the mold element or the height of the protuberances is less than or equal to 30% of the thickness. of the mold element, and, more preferably, the depth of the hollow elements is less than or equal to 15% of the thickness of the mold element or the height of the protuberances is less than or equal to at 15% of the thickness of the mold element. The addition of the protuberances makes it possible to stiffen the skin. The hollow elements do not weaken this skin because of their very small relative thickness. Advantageously, the pattern is arranged on a bead or strip of the mold member. Such an architecture makes it possible to mold the tire texture in a groove (corresponding to the cord of the skin) or an incision (corresponding to a blade of the skin) and provides an additional aesthetic appearance, for example a depth effect. Several embodiments of the patterns are provided. According to a variant, all or part of the pattern is formed by conical depressions distributed in the pattern according to a density at least equal to a conical hollow per square millimeter (mm 2), each conical recess having an average cross section of between 0.0005 mm 2 and 1 mm2. According to another variant, all or part of the pattern are striations substantially parallel to each other, the pitch of the streaks in the pattern being at most equal to 0.5 mm, each streak having an average width of between 0.02 mm. and 0.25 mm. According to yet another variant, all or part of the pattern forms recessed side parallelepipeds (C) between 0.05 mm and 0.5 mm, height (Hp) between 0.05 mm and 0, 5 mm, the distance between two adjacent parallelepipeds in the texture being between 0.05 mm and 0.5 mm. According to another advantageous embodiment, the parallelepipeds have shapes and variable distances between them. According to yet another advantageous embodiment, the protruding elements form strands, said strands being distributed in the pattern in a density at least equal to one strand per square millimeter (mm 2), each strand having an average section S of between 0.0005 mm 2 and 1 mm 2. The mold element according to the invention can be configured for molding a tire sidewall area, or for molding a tire tread area. Advantageously, the mold element is made by laser sintering. The invention also provides a sector mold for the vulcanization of tires, each sector comprising a solid support block provided with a support surface and a set of lining attached to the support block, the lining assembly comprising the less a mold element as previously described, arranged against a support surface of a support block. DESCRIPTION OF THE FIGURES [0025] All the details of embodiment are given in the description which follows, supplemented by FIGS. 1 to 8, presented solely for purposes of non-limiting examples, and in which: FIG. perspective of a first example of a mold element comprising a pattern according to the invention; FIG. 1b is a perspective view of the mold element of FIG. 1 placed on a support block; FIG. 2a is a front view of a second example of the mold element with support block according to the invention; FIG. 2b is a side view of the mold element of FIG. 2a placed on a support block; FIG. 3 shows a mold element comprising a pattern formed of grooves in the mold; FIG. 4 shows a mold element in which the streaks of the pattern have a pyramidal type section; FIG. 5 represents a pattern comprising a plurality of holes; FIG. 6 is an enlarged view of the pattern of FIG. 5; - Figure 7 shows a mold member having a pattern formed of protruding strands on the mold; - Figure 8 shows a mold member having a pattern formed of blades.
    [0003] DETAILED DESCRIPTION OF THE INVENTION [0026] "Pattern" on a mold means an organized arrangement of a plurality of elements (streaks, holes, strands, blades), all or part of these elements being the repetition of the same basic element, the pattern on the mold for obtaining a particular texture on a tire. In the description which follows, substantially identical or similar elements will be designated by identical references. Figures 1a and 1b illustrate a sector 10 of a sector mold (not shown) for the vulcanization of tires. This sector 10 comprises a support block 12 and a set of lining 14 attached to the support block 12. The support block is formed by a solid steel block comprising in particular a support surface 16 intended to receive the assembly 14 of lining. The support surface 16 is substantially smooth and has a shape substantially matching the general curvature of the tread of the tire to be molded. The packing assembly 14 comprises a mold member 18 comprising first and second opposed surfaces 22, the first surface 20 being intended to be in contact with the support surface 16 of the support block 12. The mold member 18 comprises in addition, a plurality of elements 24 of the protruding lining of the second surface 22. These lining elements 24 are intended to form the sculptures of a part of the tread of the tire to be molded. Among the elements 24 of gaskets, the assembly 14 comprises in particular strips 26 intended to form circumferential slots in the tread of the tire, or circumferential beads 28 intended to form a longitudinal groove on the tread of the tire. pneumatic. The various cords 28 are connected by axial strips so as to form an array of elements 24 of packing. The thickness 14 of the skin is between 0.25 and 6 millimeters and the various elements 24 of packing come from material with the skin 18. In other words, the assembly 14 of packing is made of a single taking. To achieve such a set 14 of packing, it is advantageously carried out by selective laser sintering of a metal powder. During the manufacture of the lining assembly 14, it is ensured that the shape of the first surface 20 of the skin 18 is complementary to the shape of the support surface of the support block 12 so that the skin 18 can correctly cooperate with the support block 12. In contrast, the shape of the various elements 24 of lining formed on the skin 18 may be arbitrary and is defined depending on the type of sculpture that is desired on the tire to be molded. Thus, one can design different types of sets 14 trim 24 trim elements vary, each of these sets 14 can be positioned on the surface 16 of the same support block 12. This allows to be able to mold different types of tires in the same mold without having to change the support blocks 12 constituting this mold. The mold member 18 comprises one or more patterns 30. According to the exemplary embodiments, the patterns 30 are provided between the cords and lamellae, and / or on portions of cords and / or on portions of slats. In the example of Figure 1b, patterns 30 defining substantially square shape profiles are provided between certain lamellae. Depending on the desired aspect, it is possible to provide a quasi-infinity of shapes or patterns of patterns. A longitudinal pattern is also provided along a bead 31. This example also includes textures on the sides of the slats 24. The patterns 30 are also integral with the mold member. The mold elements, including the patterns 30, are advantageously made by laser sintering, this method of manufacture providing the advantage of allowing the shaping of very fine and / or very complex patterns, as described in the following. FIG. 2a illustrates another exemplary embodiment in which patterns 30 are provided between each of the lamellae. The extent of the zones with pattern, the profiles as well as the positioning of the zones with pattern vary according to the embodiments. Illustrated examples are provided for illustrative and not limiting. In addition, the patterns may take striated forms, as shown for example in Figure 3, showing grooves 19 in the form of a slot, or in Figure 4, showing streaks 21 in the form of a pyramid. Figure 5 illustrates the pattern according to a first non-limiting embodiment of the first embodiment. In this variant, the pattern is formed by a plurality of cavities 112. The cavities 112 are here in the form of cones which extend into the depth of the mold and open onto the mold forming circular openings 111. The cavities 112 thus have a section that decreases in the depth of the mold. It will be noted that in this variant, the openings 111 of the cavities 112 do not touch each other. The openings 111 are separated by intermediate zones 113. In addition, the openings 111 are evenly distributed over the mold so that the distance d between each opening of the pattern is generally similar. FIG. 6 is an enlarged view of the pattern of FIG. 5. All or part of the cavities here have at least one wall 114 which, in a sectional view, forms an angle [3 between 10 ° and 60 ° with respect to a direction Z perpendicular to the pattern. FIG. 7 illustrates an embodiment in which the pattern 30 comprises a plurality of strands 106. The strands 106 being distributed in the pattern according to a density at least equal to one strand per mm 2, each strand having a mean section S between 0.0005 mm2 and 1 mm2. It will be noted that the average section of each strand corresponds to the average of sections S measured at regular intervals from the base of the strand. The strands 106 have a generally conical shape with a section decreasing in the Hb height of these strands. FIG. 8 illustrates an embodiment in which the pattern 30 comprises a plurality of blades 107 parallel to each other, the pitch of the blades 107 in the pattern 30 being at most equal to 0.5 mm, each blade 107 having a average width between 0.02 mm and 0.5 mm. It will be noted that the average width corresponds to the average of the widths I measured at regular intervals in the height HI of the blade, the height of each blade being between 0.05 and 0.5 MM. In another embodiment, the pattern comprises a combination of strands 106 and / or and blades 107. [0041] The invention is not limited to the examples described and shown and various modifications can be made without it. get out of his frame. Thus, according to another non-limiting embodiment, the blades 107 of Figure 8 may be discontinuous. They have a flat part between them. In addition, they may have section differences between them. In addition, the blades may have curvatures or angles, especially in their length. They can also be of variable length. P10-3376EN -10- [0042] Thus, according to another non-limiting embodiment variant, the cavities 112 may have a parallelepipedal section C side between 0.05 mm and 0.5 mm, Hp height between 0, 05 mm and 0.5 mm, the distance between two adjacent cavities in the texture being between 0.05 mm and 0.5 mm. Alternatively the section of the cavities may be circular, polygonal (for example hexagonal). With the square or polygonal structures, it is possible to more easily organize the openings 111 relative to each other so as to limit the area of the intermediate zones 113 between these openings. With such aperture shapes, it is possible to achieve more easily at substantial rates of occupation of the openings on the mold. To adapt a mold to the manufacture of a new type of tire, simply remove the trim assemblies 14 carried by the support blocks 12, 15 which correspond to the old type of tire manufactured, then report, advantageously in a single operation, the new sets 14 of lining on the surface 16 of the support block 12. Because the various elements 24 of trim are carried by a single skin 18, it is possible to report all the trim elements of the same sector on a support block 20 12 in a single operation, which is particularly fast. The invention has been described in connection with a sector-type mold. It can also be implemented in connection with a mold of another type. P10-3376FR
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Mold element (18) to be attached in a mold (10) for tire vulcanization, the mold element (18) having the shape of a skin having a thickness (E) of between 0.25 and 6 mm, said skin comprising a bearing surface (20) and, on the opposite side, a molding surface (22) intended to form all or part of the external surface of said tire, characterized in that it comprises a pattern (30) comprising a plurality of recessed (19, 21, 112) or protuberance (106, 107) elements integral with said mold member (18).
    [0002]
    The mold element (18) according to claim 1, wherein the depth of the recessed elements (19, 21, 112) is less than or equal to 30% of the thickness (E) of the mold element or the the height of the protuberances (106, 107) is less than or equal to 30% of the thickness (E) of the mold element.
    [0003]
    The mold element (18) according to claim 1, wherein the depth of the recessed elements (19, 21, 112) is less than or equal to 15% of the thickness (E) of the mold element or the the height of the protrusions (106, 107) is less than or equal to 15% of the thickness (E) of the mold element.
    [0004]
    The mold element (18) according to one of the preceding claims, wherein the pattern (30) is disposed on a bead (28) or lamella (24) of the mold member.
    [0005]
    5. mold element (18) according to any one of claims 1 to 4, characterized in that all or part of the pattern (30) is formed by conical cavities (112) distributed in the pattern (30) according to a density at least one conical recess per square millimeter (mm2), each conical recess having a mean cross section of between 0.0005 mm2 and 1 mm2. P10-3376FR-12-
    [0006]
    6. Mold element (18) according to any one of claims 1 to 4, characterized in that all or part of the pattern (30) are grooves (19, 21) substantially parallel to each other, the pitch of the streaks in the pattern (30) being at most equal to 0.5 mm, each streak (19, 21) having an average width of between 0.02 mm and 0.5 mm.
    [0007]
    7. mold element (18) according to any one of claims 1 to 4, characterized in that all or part of the pattern forms recessed side parallelepipeds (C) between 0.05 mm and 0.5 mm, of height (Hp) between 0.05 mm and 0.5 mm, the distance between two adjacent parallelepipeds in the texture being between 0.05 mm and 0.5 mm.
    [0008]
    8. Mold element (18) according to any one of claims 1 to 4, characterized in that the protruding elements form strands (106), said strands (106) being distributed in the pattern (30) according to a density at least one strand per square millimeter (mm2), each strand having an average section S of between 0.0005 mm2 and 1 mm2.
    [0009]
    9. mold element (18) according to any one of claims 1 to 4, characterized in that the protruding elements form blades (107) parallel to each other, the pitch of the blades (107) in the pattern (30). being at most equal to 0.5 mm, each blade (107) having an average width of between 0.02 mm and 0.5 mm.
    [0010]
    Mold element (18) according to one of Claims 1 to 9, characterized in that the recessed (19, 21, 112) or projection (106, 107) elements (109) have shapes and varying distances between them.
    [0011]
    Mold element (18) according to any one of claims 1 to 10, configured for molding a tire sidewall area.
    [0012]
    Mold element (18) according to any one of claims 1 to 10, configured for molding a tire tread area. P10-3376FR-13-
    [0013]
    13. mold element (18) according to any one of the preceding claims, produced by laser sintering.
    [0014]
    14. A sector mold for vulcanizing tires, each sector comprising a solid support block provided with a support surface (16) and a lining assembly attached to the support block, the lining assembly including at least one mold (18) according to one of claims 1 to 13, arranged against a support surface of a support block. P10-3376FR
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    法律状态:
    2015-06-19| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-01| PLSC| Search report ready|Effective date: 20160101 |
    2016-06-27| PLFP| Fee payment|Year of fee payment: 3 |
    2017-06-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-03-13| ST| Notification of lapse|Effective date: 20200206 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1401466A|FR3022830B1|2014-06-30|2014-06-30|PNEUMATIC MOLD ELEMENT HAVING HIGH CONTRAST TEXTURE|FR1401466A| FR3022830B1|2014-06-30|2014-06-30|PNEUMATIC MOLD ELEMENT HAVING HIGH CONTRAST TEXTURE|
    US15/322,532| US10589481B2|2014-06-30|2015-06-28|Mould element comprising a high-contrast texture|
    PCT/IB2015/001069| WO2016001733A1|2014-06-30|2015-06-28|Mould element comprising a high-contrast texture|
    EP15742061.3A| EP3160723B1|2014-06-30|2015-06-28|Mould element having a high-contrast textured surface|
    CN201580035891.7A| CN106470827B|2014-06-30|2015-06-28|Mold element comprising high contrast texture|
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