Classifications

• • 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
  • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
  • B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
• • 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
  • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
  • B29C33/565—Consisting of shell-like structures supported by backing material
• • 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
• • 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
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2883/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as mould material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2905/00—Use of metals, their alloys or their compounds, as mould material

Definitions

• the invention relates to a method for manufacturing molding elements for molds for molding tires with a tread comprising a circumferential arrangement of tread patterns.
• the manufacture of tires in large series uses a particularly complex and expensive industrial process, involving many machines, complex processes and multiple preparatory phases.
• the complexity of the process results in high rigidity, reducing the possibility of configuration or layout changes after the establishment of a production line.
• This rigidity is particularly applicable to the molds provided for the vulcanization and molding phases.
• more and more vehicles are produced in limited series, with features that make these vehicles unique and attractive compared to those manufactured in larger series.
• tires are often one of the strong points of demarcation. There is therefore a significant and growing need to improve the flexibility of tire manufacturing processes.
• the application FR 3014351 discloses a method of manufacturing molding elements for molds for molding tires provided with a tread comprising a circumferential arrangement of patterns of sculpture, to partially meet these objectives.
• This process comprises:
• each of the basic seals corresponding to a pattern of the circumferential arrangement of the tread of the tire to be molded.
• the raw molding element must be separated into a plurality of sections that can be used for subsequent moldings.
• the separation step is particularly complex and time-consuming because it involves cuts for each of the many sections, under high precision conditions, without affecting the quality of the elements obtained.
• Yet another object is to provide a method for optimizing the manufacture of tires, particularly in the mold preparation phase.
• the invention provides a method of manufacturing molding elements to be assembled in a mold for molding a tread of a tire, each molding element being obtained by the use of a basic element of flexible material, the method comprising:
• a step of placing at least one insert between two adjacent base elements in alignment the insert having an outer portion projecting from the two elements of base in a direction opposite to the base support and an inner portion separating the two base members;
• the molding elements are obtained more simply, faster and more economically than in the method used to date.
• the many cuts to be made for each molding element are replaced by a simple step of separating the elements already molded individually due to the presence of the inserts.
• This method allows a great flexibility in the configuration of the molds. Because each base liner corresponds to a pattern of the tread of the tire to be molded, the resultant molding elements benefit from this same characteristic. By using molding elements with different patterns, one can adapt or modify the architecture of the tread without having to replace the entire mold.
• the quantities produced for each type are easily adjustable since the intermediate mold makes it possible to house the basic fittings according to the production needs of these different types of molds.
• molding elements favoring for example one type rather than another.
• 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.
• the intermediate mold makes it possible to group the basic fittings in a simple, fast way, with precise positioning.
• the molding step of the intermediate support is therefore optimized, with optimization of the overall space and a particularly advantageous embodiment accuracy.
• a single molding phase therefore allows the production of several sectors or molding elements.
• the inserts are steel plates.
• the steel inserts are subjected to a conformation step before their insertion.
• the inserts are textile webs.
• the textile webs can be woven or entangled.
• the textile plies have a sufficient density to prevent any interpenetration in the neighboring areas of intermediate support or molding element separated by said plies.
• Textiles are advantageously used with compositions such as alkaline earth silicate fibers.
• inserts having a high temperature resistance at least up to substantially 700 ° C, and preferably water-resistant inserts.
• Each of the inserts is preferably substantially rigid in the normal direction to the main plane of said insert.
• the inserts have a thickness of 0.2 to 4 mm (for the textile) and greater than 0.2 mm for the metal.
• the molding elements comprise at least one material thickness and are machined for final shaping of the dimensions before assembly in the mold. This step optimizes the precision of the molding elements.
• the intermediate support is made of destructible material.
• the raw molding element is made of reusable material.
• the method comprises a preliminary step of producing a base matrix (or template) for obtaining corresponding basic liners.
• the method comprises a step of removing the inserts by destruction with water at high pressure.
• the base liner is made of silicone, and preferably of silastene. This gives the possibility of reusing the base trim for other productions.
• the invention also provides a mold comprising a support on which a plurality of molding elements obtained by the previously described method are circumferentially aligned.
• the invention also provides a tire obtained by molding and vulcanization using a mold having a plurality of gaskets / circumferential sectors obtained by the previously described manufacturing method.
• the tire comprises a tread provided with a plurality of circumferentially alternating patterns, each of the patterns of the circumferential arrangement corresponding to a pattern of a base liner used in the method of the invention. manufacture described above.
• FIG. 1 shows schematically the main elements for performing an intermediate support from an alignment of basic elements, with insertion of separation inserts
• FIG. 2 is a schematic representation in perspective of an example of a basic element
• Figure 3a is a diagrammatic representation in elevation of an intermediate support cooperating with a plurality of base members, inserts extending both in the intermediate support and between the base elements
• Figure 3b is a perspective view of the assembly shown in Figure 3a
• Figure 4 illustrates a schematic perspective representation of an intermediate support example in which the inserts are partially encompassed after removal of the base elements
• Figure 5 illustrates a schematic perspective representation of an exemplary raw molding element, in which the inserts are partially enclosed, after removal of the intermediate support
• FIG. 6 illustrates a schematic representation in perspective of an exemplary molding element after separation.
• read 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.
• destructible material means a material easy to remove after molding of the intended element, by destruction, such as by breaking or cutting.
• reusable material is meant a material whose mechanical characteristics allow reuse repeatedly in an industrial tire molding process.
• FIG. 2 illustrates an example of a basic element 1 made of flexible material such as silicone, and preferably silastene.
• the base member has a substantially elongate profile, with at each of its ends a preferably dovetail-shaped attachment member.
• a plurality of base elements 1 are aligned transversely against each other on a base support 4 so as to reproduce a tread portion 2.
• one or more supports such as wedges, a material of higher hardness than that of the base elements are provided, for example on each side of the base elements arranged at the lateral ends.
• Each base element 1 is separated from its neighbor by an insert 9 serving as a separator.
• the zone serving as separator is designated internal part 1 1 in what follows.
• This inner part 1 1 is advantageously extended towards the base support 4 up to this one.
• the inner portion is interrupted before joining the base support 4.
• This space without separation will be used for the molding step of the molding elements 5 to form a connection zone between the molding elements 5.
• the inter-connected molding elements can for example be handled in one block before being subsequently separated.
• the connection zone is provided in a sufficiently fine manner that the separation between the elements is easy to achieve.
• This intermediate support 3 is advantageously made of destructible material such as plaster.
• Figures 3a and 3b illustrate in more detail (in elevation and in perspective) the result obtained when the intermediate support 3 is molded, and the basic elements still in place.
• Each of the inserts 9 has an internal part 1 1 (separating two base elements) and an outer portion 10 protruding from the base elements 1 so as to be included in the intermediate support 3.
• the outer portion projects at least 1 cm in average, in the length of the room.
• Figure 5 shows a set of molding elements 5 after molding and removal of the intermediate support 3, for example by destruction.
• the figure makes it possible to clearly observe the inserts 9 with the external parts 10 again free, and the internal parts 1 1 separating each of the molding elements 5.
• the molding elements 5 are made of "reusable material" such as light metal alloy, for example aluminum. This material also has the advantage of being easily moldable and machinable.
• the inner parts 1 1 of the inserts 9 extend over the entire side of the molding elements.
• Figure 6 shows the result of the subsequent step after removal of the inserts and separation of the individual molding elements.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Tires In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55072715

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (6)

• 2015
  • 2015-09-26 FR FR1501995A patent/FR3041562B1/fr active Active
• 2016
  • 2016-09-23 EP EP16784229.3A patent/EP3352962A1/fr not_active Withdrawn
  • 2016-09-23 WO PCT/FR2016/052414 patent/WO2017051131A1/fr unknown
  • 2016-09-23 US US15/761,525 patent/US20190054663A1/en not_active Abandoned
  • 2016-09-23 CN CN201680055167.5A patent/CN108136623A/zh not_active Withdrawn

Also Published As

Similar Documents

Legal Events