EP4117898A1 - Element de garniture de moule de cuisson pour pneumatique comportant un element de moulage adapte - Google Patents
Element de garniture de moule de cuisson pour pneumatique comportant un element de moulage adapteInfo
- Publication number
- EP4117898A1 EP4117898A1 EP21709417.6A EP21709417A EP4117898A1 EP 4117898 A1 EP4117898 A1 EP 4117898A1 EP 21709417 A EP21709417 A EP 21709417A EP 4117898 A1 EP4117898 A1 EP 4117898A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pattern
- tire
- protruding
- molding
- recessed
- 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 40
- 239000011324 bead Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 241000446313 Lamella Species 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 235000021189 garnishes Nutrition 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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)
- B29D30/0601—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
- B29D2030/0612—Means for forming recesses or protrusions in the tyres, e.g. grooves or ribs, to create the tread or sidewalls patterns
-
- 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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
- B29L2030/002—Treads
Definitions
- the present invention relates to the manufacture of tires and, more particularly, to the field of baking molds used during a baking step of a tire.
- the manufacture of a tire comprises a curing step, during which a tire blank is molded and vulcanized in order to obtain a tire of given mechanical characteristics, geometry and appearance.
- the tire is baked in a baking mold.
- the tire blank is pressed against the mold so as to mold the internal surface of the mold on said blank, and thus form the external surface of the tire.
- the mold comprises a lining intended to form a sculpture on the tread of the tire.
- the radially internal surface of the lining comprises recessed and protruding patterns.
- the protuberance patterns take compact or longitudinal shapes.
- the patterns of longitudinal shape are formed by strips of thickness greater than 2 mm, intended to mold grooves on the tread pattern of the tire, or by strips of thickness less than or equal to 2 mm and of various shapes, intended for molding notches. Said patterns extend circumferentially and / or transversely on the radially inner surface of the lining.
- the protuberance patterns of longitudinal shape sometimes extend in a curved manner and intersect regularly on the lining according to various incidences.
- the intersections thus formed take on complex and unique shapes. Some of these intersections partially delimit a recessed pattern in which the rubber of the tire blank is molded and vulcanized.
- the result is a tire, the tread pattern of which has protuberance patterns that are not very advantageous.
- FIG. 3 illustrates the result, on the sculpture, of the molding of the intersection of an inverted Y-shaped lamella and a lamella on which a bead is arranged.
- Protuberance thus formed is a thin strip of rubber which can tear off when the tire is being rolled and be the cause of irregular wear.
- An objective of the invention is to remedy the drawbacks of the state of the art and to provide an original solution to improve the quality of the molding of a tire, while improving its performance.
- the invention provides a tire baking mold lining element forming a molding surface, the molding surface comprising recessed and protruding patterns, a first protruding pattern delimiting a first pattern in hollow, and a second protruding pattern forming an intersection with the first protruding pattern, the intersection partially delimiting at least a second hollow pattern, the second hollow pattern projecting from the first hollow pattern.
- the trim element comprises a molding element adapted to fill the second recess pattern.
- the second hollow pattern is filled in by a molding element. Consequently, the tread pattern of the tire does not have an unsuccessful or unnecessary shape, such as the thin strips of rubber.
- the first protruding pattern and the first recessed pattern take a longitudinal shape.
- the first protruding pattern is formed by a first blade of fork-shaped section.
- the second protrusion pattern is formed of a second sipe and a bead extending along a radially inner contour of the second sipe.
- the invention is particularly advantageous for a trim element comprising the intersection of a Y lamella and a lamella comprising a bead.
- said molding element is integral with the first strip.
- the second strip and the bead comprise assembly means taking the form of a slot in which the first strip is intended to be inserted.
- said molding element is integral with the second strip and the bead.
- the second hollow pattern forms a tongue whose thickness in the middle of the tongue is less than 5 mm and, more preferably, less than 2.5 mm.
- the invention provides a method of manufacturing a tire comprising a baking step in a baking mold for a tire comprising a lining element according to a first object of the invention.
- FIG. 1 is a view in radial section of certain elements of a baking mold
- FIG. 2 is a perspective view of certain elements of the lining of the mold of FIG. 1
- FIG. 3 is a perspective view of part of the tread of a tire having reached a certain level of wear, said part having been molded by the elements of FIG. 2
- FIG. 4 is a perspective view of certain elements of the lining of the mold of FIG. 1, according to a first variant of the invention
- FIG. 5 is a perspective view of certain elements of the lining of the mold of FIG. 1, according to a second variant of the invention
- FIG. 6 is a perspective view of certain elements of the lining of the mold of FIG. 1, according to a second variant of the invention.
- identical or similar elements bear the same reference. Their description is therefore not systematically repeated.
- FIG. 1 schematically illustrates a curing mold 10 of a tire used to mold and vulcanize a tire blank, with a view to obtaining a tire of the desired geometry and appearance.
- the mold defines a generally symmetrical interior space by revolution of the central axis 12.
- the baking mold comprises a frame, molding elements, vulcanization means, and means for opening and closing the mold.
- the opening and closing means are able to set the molding elements in motion between an open position and a closed position ( Figure 1).
- the open position corresponds to the step of extracting a molded and vulcanized tire, as well as the step of introducing a new tire blank.
- the closed position corresponds to the step of molding and vulcanizing the tire blank.
- the vulcanization means are able to supply the thermal energy and the pressure necessary, respectively, for the vulcanization and the molding of the tire blank.
- the supply of thermal energy and pressure is provided by pressurized steam circulating around the mold, and inside the tire blank in an expandable membrane.
- the molding elements form a molding surface 14 corresponding in negative to the desired external surface of the tire.
- the molding elements more particularly comprise a lining 16 intended to mold the tread of the tire, two shells 18 intended to mold the sidewalls of the tire, and two rings 20 intended to mold the beads of the tire.
- the lining 16 bears by its radially outer surface on a crown 22 of the mold.
- the liner generally comprises a plurality of liner elements disposed circumferentially.
- a trim element comprises several strips, a body and possible inserts.
- a lamella is a fine molding element.
- the lamella comprises a molding part, the thickness of which generally varies from 0.2 to 2 mm for a tire intended to be mounted on a passenger vehicle, and an anchoring part suitable for being immersed in the body of the element. of garnish.
- a lamella is obtained by a material removal process such as laser cutting, plastic deformation such as stamping, manufacturing additive such as consolidation by selective melting, or by a combination of these methods.
- a packing element is obtained by a foundry process by overmolding the body of the packing element around the anchoring part of the lamellae, or by manufacturing the body of the packing element by a manufacturing process additive, then assembly of said body with the lamellae.
- the assembly of the lamellae with the packing body so as to produce a packing element can be carried out by a screwed assembly process, by gluing, by welding, or by any other suitable assembly process.
- a lining element can be obtained by an additive manufacturing process in which the body of the lining element and the molding part of the lamellae are made in one piece.
- the molding surface of the lining 16 comprises recessed patterns 24 and protruding patterns 26.
- pattern is meant the shape of a portion of the molding surface of the lining, or the corresponding shape part of the tread pattern of a tire.
- a pattern has a technical and / or aesthetic function.
- the molding surface of the lining is circumscribed by an outer jig of substantially cylindrical or toric shape, called “crown shape”.
- the protruding patterns extend radially from the crown shape to the interior of the mold.
- a radial direction 28 is a direction perpendicular to the central axis 12 of the mold.
- the protruding patterns take the form of parallelepipeds, of grooves extending circumferentially and / or transversely, or else, take the form of lamellae or spikes.
- the protruding patterns delimit totally or in part, on the molding surface, the recessed patterns.
- the recessed patterns take prismatic shapes, or alternatively, extend circumferentially and / or transversely in a polygonal section.
- Figure 2 illustrates part of the molding surface of the gasket 16.
- At least a first protrusion pattern 30 is formed by a first blade 32 of fork-shaped section 34, and at least a second protrusion pattern 36 is formed by a second lamella 38 and a bead 40 extending along a radially inner contour 42 of the second sipe.
- the first said Y strip comprises two molding parts.
- a first trunk-shaped section portion 44 extends from the crown shape 46 inwardly of the mold, and a second part, extending and dividing the trunk, of section in the form of branches 34.
- the second part comprises two branches.
- the height, measured in the radial direction 28, of the first part is less than 10 mm and, preferably, less than 7 mm.
- the height of the second part is between 2 mm and 10 mm and, preferably, between 2 mm and 7 mm.
- the thickness, measured in a circumferential or transverse direction, of the second part or, in other words, of the fork, is between 2 mm and 10 mm and, preferably, between 2 mm and 7 mm.
- a circumferential or transverse direction is perpendicular to the radial direction 28 and, respectively, orthogonal or parallel to the central axis 12.
- the bead 40 is arranged along the radially inner contour 42 of the second sipe 38.
- the section of the bead takes various shapes, and is delimited by a contour of rounded, polygonal, convex or concave shape.
- the bead is integral with the second sipe 38.
- the height of the second sipe is between 2 mm and 20 mm and, preferably, between 2 mm and 14 mm.
- the thickness of the bead is understood as the section of the bead which is included in a circular template with a diameter of between 2 mm and 20 mm and, preferably, between 2 mm and 7 mm.
- the thickness of the bead of the second protruding pattern is less than 60% of the thickness of the fork of the first protruding pattern, more preferably less than 50% and, even more preferably, less than 40 %.
- the height of the bead of the second protruding pattern is between 50% and 200% of the height of the fork of the first protruding pattern and, more preferably, between 70% and 150%.
- the bead of the second protruding pattern and the fork of the first protruding pattern overlap radially at most over 50% of their height and, more preferably, at most over 30% of their height.
- At least one hollow pattern of the lining 16 takes substantially the form of a parallelepiped or, in other words, of a polyhedron with 6 faces, the opposite faces of which are substantially parallel.
- the molding surface 14 comprises several of said hollow patterns, distributed homogeneously over the whole of said molding surface. At least 20% of said recessed patterns and, preferably, at least 50% of said recessed patterns, are delimited in part by at least a first protruding pattern 30 and at least a second protruding pattern 36. Preferably, the first protruding pattern and the second protruding pattern intersect.
- said hollow patterns are delimited by at least a first protruding pattern and a pair of second protruding patterns, the first protruding pattern intersecting at each of its ends a second protruding pattern.
- the protruding patterns 26 can form intersections 48. According to a radial view of the trim, an intersection is delimited by a contour including the superimposed parts of each protruding pattern. Therefore, by "intersection of protruding patterns", we do not mean the regular parts, or outside said contour, of the protruding patterns intersecting, we mean at least the singular parts and the superimposed parts of said patterns.
- the regular parts of the protruding patterns are the parts whose radial profile is not impacted by the intersection of protruding patterns.
- the first protrusion pattern 30 defines a first hollow pattern 50
- the second protrusion pattern 36 forms an intersection 48 with the first protrusion pattern.
- the first protrusion pattern 30 and the first indentation pattern 50 take a longitudinal shape.
- Intersection 48 partially defines at least a second recessed pattern (not shown).
- the second hollow pattern protrudes from the first hollow pattern, and forms a tongue 52 ( Figure 3) whose thickness in the middle of the tongue is less than 5 mm and, more preferably, less than 2, 5 mm.
- the trim element has a molding element adapted to fill the second recess pattern.
- the molding element 54 is integral with the first strip 32.
- the second strip 36 and the bead 38 comprise assembly means 54 taking the form of a slot 56 in which the first strip is intended to be inserted (FIG. 5).
- the molding element 52 is integral with the second strip 38 and the bead 40.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2002357A FR3108058B1 (fr) | 2020-03-10 | 2020-03-10 | Elément de garniture de moule de cuisson pour pneumatique comportant un élément de moulage adapté |
| PCT/EP2021/055739 WO2021180626A1 (fr) | 2020-03-10 | 2021-03-08 | Element de garniture de moule de cuisson pour pneumatique comportant un element de moulage adapte |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4117898A1 true EP4117898A1 (fr) | 2023-01-18 |
Family
ID=70614199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21709417.6A Pending EP4117898A1 (fr) | 2020-03-10 | 2021-03-08 | Element de garniture de moule de cuisson pour pneumatique comportant un element de moulage adapte |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230347608A1 (fr) |
| EP (1) | EP4117898A1 (fr) |
| CN (1) | CN115243870A (fr) |
| FR (1) | FR3108058B1 (fr) |
| WO (1) | WO2021180626A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3099076B1 (fr) | 2019-07-24 | 2022-10-21 | Michelin & Cie | Insert pour élément de garniture de moule pour pneumatiques |
| FR3113472B1 (fr) | 2020-08-19 | 2023-02-10 | Michelin & Cie | Moule de cuisson pour pneumatique comportant des moyens de découpage d’une bavure de gomme |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2011002468A (es) * | 2008-09-11 | 2011-04-05 | Michelin Rech Tech | Llanta para neumatico de area superficial variable y neumatico. |
| BRPI0823159A8 (pt) * | 2008-10-03 | 2017-12-19 | Societe De Tech Michelin E Michelin Recherche Et Technique S A | Elemento de molde ondulante para lamela e banda de rodagem de pneu |
| WO2010144091A1 (fr) * | 2009-06-12 | 2010-12-16 | Societe De Technologie Michelin | Elément moule progressif pour pneumatique pourvu d'une ondulation sur son élément supérieur et pneumatique formé par celui-ci |
| US20120267823A1 (en) * | 2011-04-25 | 2012-10-25 | Frank Pierre Severens | System and method for a pneumatic tire mold |
| FR3014734B1 (fr) * | 2013-12-12 | 2016-08-12 | Michelin & Cie | Element moulant comportant un moyen d'assemblage particulier |
| US20180065332A1 (en) * | 2015-03-31 | 2018-03-08 | Compagnie Generale Des Establissements Michelin | Tire molding element, tire vulcanization mold, and tire |
-
2020
- 2020-03-10 FR FR2002357A patent/FR3108058B1/fr active Active
-
2021
- 2021-03-08 EP EP21709417.6A patent/EP4117898A1/fr active Pending
- 2021-03-08 US US17/910,671 patent/US20230347608A1/en active Pending
- 2021-03-08 WO PCT/EP2021/055739 patent/WO2021180626A1/fr not_active Ceased
- 2021-03-08 CN CN202180020443.5A patent/CN115243870A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3108058B1 (fr) | 2023-07-14 |
| US20230347608A1 (en) | 2023-11-02 |
| WO2021180626A1 (fr) | 2021-09-16 |
| CN115243870A (zh) | 2022-10-25 |
| FR3108058A1 (fr) | 2021-09-17 |
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