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

Applications Claiming Priority (2)

Publications (1)

Family

ID=57045220

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (5)

• 2016
  • 2016-07-18 FR FR1670387A patent/FR3053919A1/fr not_active Withdrawn
• 2017
  • 2017-07-05 CN CN201780043884.0A patent/CN109476046A/zh not_active Withdrawn
  • 2017-07-05 EP EP17745836.1A patent/EP3484683A1/de not_active Withdrawn
  • 2017-07-05 WO PCT/FR2017/051830 patent/WO2018015630A1/fr unknown

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