• 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:
    A cutting method for a semi-finished molding element (1) for providing sectors (2) of a mold for molding and vulcanizing tires, said molding element (1) comprising a plurality of sectors (2) derived from the same molding operation, said molding element 1 comprising at least one pair of male fastening members (3) on each side of a molding face (4) intended to form the tread patterns of the tire to be molded , said method comprising the steps of: - aligning and indexing the semifinished molding element (1) on a fixing support (10) provided with indexing marks (14, 15) and female attachment members ( 12) corresponding to those of the molding element; attaching the semi-finished molding element (1) indexed to the fixing support (10) by means of the male (3) and female (12) fixing members; -cutting sectors (2).
    公开号:FR3014349A1
    申请号:FR1302850
    申请日:2013-12-06
    公开日:2015-06-12
    发明作者:Jerome Lepretre；Patrick Andanson；Enrique Segoviano
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to a method of manufacturing molding elements for molds for molding tires with a tread having a circumferential patterning arrangement. BACKGROUND OF THE INVENTION of sculpture. It relates more particularly to a cutting phase for separating a plurality of sectors obtained jointly during a molding operation. PRIOR ART [0002] The manufacture of tire molds and the components of these molds involves a great variety of steps, often of great complexity, and high costs of production as well as material. It is also essential that all the components integrated into the molds can benefit from a high level of precision, making the operations of designing and producing molds particularly delicate. To optimize the processes without the quality being affected, all the constituent parts of the molds and all the operations and intermediate steps must be considered. There is therefore a need to optimize the process of making the molds and the various constituent elements of the molds, while ensuring a high level of molding quality and great flexibility of the manufacturing methods. SUMMARY OF THE INVENTION [0005] An object of the invention is to manufacture tire mold sectors economically, with great accuracy, while minimizing material losses. Another object of the invention is to provide a manufacturing method for reducing the loss of raw materials during changes in the visual characteristics of the tires. Another object is to provide a method for optimizing the manufacture of tires, particularly in the mold preparation phase. To this end, the invention provides a cutting method for a semi-finished molding element for supplying sectors of a mold for molding and vulcanizing tires, said molding element having a plurality of sectors derived from same molding operation, said molding member 20 having at least one pair of male fastening members on each side of a molding face provided to form the tread patterns of the tire to be molded, said method comprising the following steps: - alignment and indexing of the semi-finished molding element 1 on the fixing support by means of indexing marks; - clamping the semi-finished molding element on a fastening support provided with female fastening members corresponding to those of the molding element by means of the male and female fastening members; - installation of the mounting bracket on a cutting machine; 30 - cutting sectors by the cutting machine. The method is particularly advantageous for obtaining a precise positioning of the molding element, so as to proceed to cutting accurately, from a good indexing of the part and cutting areas. According to an advantageous embodiment, the male fastening members are studs comprising dovetail-shaped cuts extending radially internally from the molding elements. According to another advantageous embodiment, the members female fasteners have dovetail-shaped cutouts extending radially internally from the molding elements. The arrangement of the fastening members in complementary shapes of dovetail produces excellent retention of the fixed part. According to an advantageous embodiment, the indexing marks of the fixing support comprise at least two indexing blocks provided with an indexing notch precisely located relative to the support. Advantageously, the indexing marks of the semi-finished molding element comprise an indexing finger for insertion into the notch of the indexing block of the support. This provides a simple, reliable and economical way to obtain indexing means conferring a good level of accuracy. Alternatively, the indexing fingers are of different dimensions and / or shapes on each side, so as to allow positioning in one direction. According to an advantageous embodiment, the cutting is performed using a jet of water at very high pressure. According to an advantageous embodiment, the method also comprises a machining step, after the cutting step, in which the surplus material between the sectors is removed. During a machining step of a sector, the latter is attached to a machining machine by means of fasteners provided with dovetail shaped cutouts. The invention also provides a fixing support for the implementation of the cutting method previously described, comprising a holding frame, at least two indexing blocks provided with bearing surfaces and notches 10 of indexing, and at least two female attachment members. Advantageously, the female fastening members comprise cutouts in the form of a dovetail. Finally, the invention provides a semi-finished molding element for providing sectors of a mold for molding and vulcanizing tires comprising: - a molding face, having patterns for molding the sculptures of a tire tread; Fasteners on each side of the molding face; - indexing elements; a plurality of sectors intended to be cut from each other by means of the cutting method previously described. In an advantageous embodiment, each sector comprises a pair of fixing members provided for individually fixing each sector on a machining machine for a machining step after cutting. Thus, before cutting, the molding element is provided with a plurality of pairs of fastener members, one of which is provided for fixing said molding element to the support of the cutting machine. After cutting the sectors, each of them carries a pair of fasteners, to attach each sector to a machining machine. According to another advantageous embodiment, each sector comprises a pair of reference surfaces intended to cooperate with the bearing surfaces of the indexing blocks. DESCRIPTION OF THE FIGURES [0024] Other characteristics and advantages of the invention will emerge from the following description, given by way of example, without being limiting in nature, with reference to the accompanying drawings, in which: FIG. 1 is a diagrammatic representation of FIG. With the help of a perspective view, the main elements for fixing a semi-finished molding element to allow one or more sector cutting operations for tire molds; Figure 2 is a schematic front view of the elements of Figure 1; Figure 3 illustrates a schematic perspective representation of an exemplary sector after cutting; Fig. 4 illustrates an enlarged schematic representation of Fig. 3 showing more particularly an attachment member of a sector; Fig. 5 is a schematic perspective representation of an exemplary female fastener member; Figure 6 is a schematic perspective representation of an exemplary index block; Figure 7 shows an example of an index bar; Figure 8 shows an example of a cutting phase on a very high pressure water jet machine. P1 0-3206en.doc [0025] In the following description, substantially identical or similar elements will be designated by identical references.
    [0002] DETAILED DESCRIPTION OF THE INVENTION DEFINITIONS [0026] By "tire" is meant all types of elastic bandages 10 subjected to internal pressure or not. By "tread" of a tire is meant a quantity of rubber material delimited by lateral surfaces and by two main surfaces, one of which is intended to come into contact with a roadway when the tire is rolling. By "sculpture" is meant the surface and volume arrangements of rubber mixes on the outer surface of the tire intended to ensure contact with the rolling surface, and whose shape makes it possible to adjust the operational performance of the tire. The sculptures also make it possible to impart an aesthetic appearance to the tread or other area of the tire such as the sidewalls. By "mold" is meant a set of separate mold elements which, by relative approximation, make it possible to define a toroidal molding space for the vulcanization and molding of a tire. Figure 3 illustrates an example of a sector 2 used in a mold 30 to ensure the molding and vulcanization of tires. Such a substantially elongated sector comprises, at each of its ends, a male fastening member 3 having a dovetail-shaped cutout, better visible in the perspective view of Figure 4. P1 0-3206fr. The use of this type of sector in a tire molding and vulcanization process gives great flexibility in the configuration of the molds. Indeed, it is possible to provide that a sector corresponds to a pattern of the tread of the tire to be molded. By using molding elements with different patterns, one can adapt or modify the architecture of the tread without having to replace the entire mold. Moreover, the simultaneous manufacture of a plurality of molding elements optimizes the manufacturing process, with a simplification of the tooling and a reduction of material losses. To manufacture these sectors economically, a semi-finished molding element 1 such as that illustrated in the example of FIG. 1 is first produced by molding. Such a semi-finished molding element comprises a plurality of sectors 2 which should be separated from each other. In what follows, the proposed method recommends cutting at the junction between two adjacent sectors, as many times as necessary, depending on the number of sectors. The cutting phase can be performed using one or more jets of water at very high pressure, or by any other means for cutting accurately, quickly and repeatability. After cutting operations, machining operations allow the removal of material portions not useful for molding operations and the realization of possible additional areas on the sectors. To achieve the level of precision required during cutting, it is essential to be able to locate the semi-finished molding element 1 and the cutting planes, to be able to position the cutting tools precisely with respect to these cutting planes and especially to ensure that the molding element is fixed very solidly to withstand the many and intense mechanical stress generated by the cutting operations. P1 0-3206en.doc [0035] The invention proposes to use a fixing support 10 such as that illustrated for example in Figures 1 and 2. The fixing support 10 comprises a holding frame 11 on which the element of Semi-finished molding 1 is positioned and indexed to make the cuts in alignment as accurate as possible with the cutting planes. The illustrated attachment frame has a substantially square profile. In the middle of one of the sides, an indexing bar 16 (shown in detail in FIG. 7) is fixed to the frame 11. In the illustrated example, two female attachment members 12 are provided, one on each side of the frame. the molding element 1, with respect to the male fastening members 3 of the molding element 1. The two female fastening members 12 are fixed to the bar 16, one of which, via longitudinal slideways, allowing the female attachment means 12 to be positioned longitudinally in the right place, depending on the dimensions of the molding element 1. FIG. 5 shows an example of a female fastener member 12 provided with a tail-shaped cutout. dovetail 13 at one of its ends. The semi-finished molding element 1 is placed on the holding frame 11 with the molding face 4 towards the frame. This arrangement makes it possible to provide clamping of the molding element 1 by means of the male fastening members 3. The complementary profiles in the form of a dovetail make it possible to form a precise and resistant fitting of the fixed part, providing a good resistance to axial and transverse forces in order to maintain the correct positioning of the respective parts throughout the cutting process of sectors 2, this process being capable of generating significant efforts. Figure 4 is an enlarged perspective view of an exemplary indexing finger 5 placed against the base of a male fastening member 3, also visible in Figure 3. The indexing fingers can predict precise positioning of the sectors, either during the cutting phase and / or during a subsequent molding / vulcanization phase in a tire mold provided with a plurality of circumferentially aligned sectors. FIGS. 7 and 8 illustrate an example of an indexing block 14 provided with an indexing notch 15 corresponding to a finger 5. Advantageously, a block 14 is provided at each end of the sector, preferably in a manner adjacent to the male fastening members by which the molding element is fixed to the holding frame 11. The fingers 5 and notches 15 on each side of the same sector may be of different size and / or shape to ensure a mounting in one direction only if this is required. THE PROCESS [0039] Thanks to the previously described fixing support, a cutting method for semi-finished molding element 1 can be optimally performed. According to the method of the invention, the clamping of the semi-finished molding element 1 is carried out on the fixing support 10 by means of the corresponding male 3 and female 12 fastening members. The indexing marks 14 and 15 make it possible to perform the alignment and the indexing of the semi-finished molding element 1 on the fixing support 10. The reference surface 6 on each side of each sector allows a support positioned well on a bearing surface 17 of the indexing marks 14. Once the molding element 1 is in place on the support 10 with the clamping means engaged in each other, the molding element being well aligned relative to the support, the assembly is placed on a specially adapted cutting machine, preferably a very high pressure water jet cutting machine. The cutting of the sectors 2 is then effected efficiently and safely due to the solid clamping of the element to be cut that can undergo the forces due to cutting without risk of misalignment or disassembly. Figure 8 shows an example of cutting with a nozzle projecting a jet of water (advantageously containing abrasive particles such as sand) along the lines of cuts between the sectors. To facilitate the production of multiple blanks, these are preferably made so as to leave a zone or a layer of material between the cut sectors. This layer is sufficient to allow the whole of the molding element 1 to maintain its initial curved shape during all the cuts. The amount of material retained is however sufficiently thin so that the sectors can easily be separated from each other after disassembly of the support of the cutting machine.
    [0003] P1 0-3206en.doc
    权利要求:
    Claims (13)
    [0001]
    REVENDICATIONS1. A cutting method for a semi-finished molding element (1) for providing sectors (2) of a mold for molding and vulcanizing tires, said molding element (1) comprising a plurality of sectors (2) derived from the same molding operation, said molding element (1) having at least one pair of male fastening members (3) on each side of a molding face (4) provided to form tread patterns of the tire tread molding method, said method comprising the following steps: alignment and indexing of the semi-finished molding element (1) on the fixing support (10) by means of indexing marks (14, 15); -bridging the semifinished molding element (1) on a fixing support (10) provided with female fastening members (12) corresponding to those of the molding element (10), by means of the members of male (3) and female (12) fasteners; placing the mounting bracket (10) on a cutting machine; -cutting sectors (2) by the cutting machine. 20
    [0002]
    2. Cutting method according to claim 1, wherein the male fastening members (3) are studs having dovetail-shaped cuts extending radially inwardly of the molding elements (1).
    [0003]
    3. Cutting method according to one of claims 1 or 2, wherein the female fastening members (12) comprise dovetail-shaped cuts extending radially inwardly of the molding elements (1).
    [0004]
    4. Cutting method according to one of claims 1 to 3, wherein the indexing marks of the fixing support (10) comprise at least two indexing blocks (14) provided with an indexing notch ( 15) precisely located with respect to the support (10). P1 0-3206en.doc
    [0005]
    The cutting method according to claim 4, wherein the indexing marks of the semi-finished molding element (1) comprise an indexing finger (5) for insertion into the notch (15) of the block of indexing (14) the support (10).
    [0006]
    6. Cutting method according to one of claims 1 to 5, wherein the cutting of the sectors is carried out using a jet of water at very high pressure.
    [0007]
    7. The cutting method according to one of claims 1 to 6, further comprising a machining step, after the cutting step, wherein the surplus material between the sectors is removed.
    [0008]
    8. Cutting method according to claim 7, wherein, during the step of machining a sector, the latter is fixed to the machining machine by means of 15 fixing members (3) provided with cutouts shape of dovetail.
    [0009]
    Fastening support for the implementation of the cutting method according to one of claims 1 to 8, comprising a holding frame (10), at least two indexing blocks (14) provided with bearing surfaces ( 17) and indexing notches (15), and at least two female attachment members (12).
    [0010]
    10. Support according to claim 9, wherein the female fastening members (12) comprise cutouts in the form of a dovetail (13). 25
    [0011]
    A semi-finished molding element (1) for providing sectors (2) of a mold for molding and vulcanizing tires comprising: - a molding face (4) having patterns for molding the sculptures of a tire tread; fastening members (3) on each side of the molding face; Indexing elements (5); a plurality of sectors (2) intended to be cut from each other by means of the cutting method according to one of claims 1 to 8. P1 0-3206en.doc
    [0012]
    A semi-finished molding element (1) according to claim 11, wherein each sector (2) has a pair of fastening members (3) for individually securing each sector to a machining machine for a step of machining after cutting.
    [0013]
    13. Semi-finished molding element (1) according to one of claims 11 or 12, wherein each sector (2) comprises a pair of reference surfaces (6) provided to cooperate with the bearing surfaces (17). index blocks (14). 10 P1 0-3206en.doc
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    同族专利:
    公开号 | 公开日
    CN105793024A|2016-07-20|
    EP3077189B1|2020-09-23|
    CN105793024B|2019-03-08|
    FR3014349B1|2016-10-21|
    WO2015082969A1|2015-06-11|
    US20160303812A1|2016-10-20|
    EP3077189A1|2016-10-12|
    US10118354B2|2018-11-06|
    引用文献:
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    法律状态:
    2015-12-21| PLFP| Fee payment|Year of fee payment: 3 |
    2016-12-22| PLFP| Fee payment|Year of fee payment: 4 |
    2017-12-21| PLFP| Fee payment|Year of fee payment: 5 |
    2019-09-27| ST| Notification of lapse|Effective date: 20190906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1302850A|FR3014349B1|2013-12-06|2013-12-06|METHOD OF CUTTING SECTIONS FOR PNEUMATIC MOLDS|FR1302850A| FR3014349B1|2013-12-06|2013-12-06|METHOD OF CUTTING SECTIONS FOR PNEUMATIC MOLDS|
    CN201480066656.1A| CN105793024B|2013-12-06|2014-11-28|It cuts the method for the section of tire-mold and the semi-finished elements of the section of the mold for molded tire is provided|
    EP14815010.5A| EP3077189B1|2013-12-06|2014-11-28|Method for cutting sectors for tyre moulds and semi-finished element for supplying sectors of a mould for moulding tyres|
    PCT/IB2014/002591| WO2015082969A1|2013-12-06|2014-11-28|Method for cutting sectors for tyre moulds and semi-finished element for supplying sectors of a mould for moulding tyres|
    US15/102,124| US10118354B2|2013-12-06|2014-11-28|Method for cutting segments for tire molds|
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