WO2008066533A2 - Préparation de rechapage - Google Patents

Préparation de rechapage Download PDF

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Publication number
WO2008066533A2
WO2008066533A2 PCT/US2006/045868 US2006045868W WO2008066533A2 WO 2008066533 A2 WO2008066533 A2 WO 2008066533A2 US 2006045868 W US2006045868 W US 2006045868W WO 2008066533 A2 WO2008066533 A2 WO 2008066533A2
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
cutting tool
tire
circumferential surface
cylindrical body
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.)
Ceased
Application number
PCT/US2006/045868
Other languages
English (en)
Other versions
WO2008066533A3 (fr
Inventor
Juan-Pablo Gallego
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michelin Recherche et Technique SA Switzerland
Societe de Technologie Michelin SAS
Original Assignee
Michelin Recherche et Technique SA Switzerland
Societe de Technologie Michelin SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Michelin Recherche et Technique SA Switzerland, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
Priority to PCT/US2006/045868 priority Critical patent/WO2008066533A2/fr
Publication of WO2008066533A2 publication Critical patent/WO2008066533A2/fr
Publication of WO2008066533A3 publication Critical patent/WO2008066533A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/44—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cup or like cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/003—Cutting work characterised by the nature of the cut made; Apparatus therefor specially adapted for cutting rubber
    • 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
    • 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
    • B29D30/54—Retreading
    • B29D2030/541—Abrading the tyre, e.g. buffing, to remove tread and/or sidewalls rubber, to prepare it for retreading

Definitions

  • the invention relates to a machine and process for machining rubber products such as
  • Tires are known to comprise a tread consisting of an outer layer of rubber-based mixtures, of greater or lesser thickness, in which are molded various grooves and tread patterns intended, inter alia, to improve the vehicle's grip relative to the ground.
  • Another process used for tire tread machining is a cutting process.
  • a cylindrical cutter called a "peeler” is typically used.
  • a problem with these cylindrical cutters is that the cutting process leaves a smooth surface on the surface of the tire that often requires a subsequent texturing operation to make the carcass surface suitable for bonding. Also, the cylindrical cutter results in long continuous strips of removed material which can result in a jamming of the machine.
  • a particular embodiment of the present invention includes a cutting tool comprising: a cylindrical body; an annular bevel formed in an end of the cylindrical body forming a circular cutting edge at one of an outer circumferential surface of the cylindrical body and an inner circumferential surface of the cylindrical body; a plurality of grooves formed in one of the outer circumferential surface of the cylindrical body and the inner circumferential surface of the cylindrical body, the plurality of grooves creating a discontinuities in the circular cutting edge; wherein at least two adjacent grooves of the plurality of grooves are spaced about the cylindrical body at a pitch period of 5mm or less.
  • Another particular embodiment of the present invention includes a machine for machining tire treads, comprising: a frame; a drum for supporting the tire and rotating it about its axis; a cutting tool comprising a cylindrical body, an annular bevel formed in an end of the cylindrical body forming a circular cutting edge at one of an outer circumferential surface of the cylindrical body and an inner circumferential surface of the cylindrical body, a plurality of grooves formed in one of the outer circumferential surface of the cylindrical body and the inner circumferential surface of the cylindrical body, the plurality of grooves creating a discontinuities in the circular cutting edge, wherein at least two adjacent grooves of the plurality of grooves are spaced about the cylindrical body at a pitch period of 5mm or less.
  • Another particular embodiment of the present invention includes a method for cutting the tread of a tire; the method comprising the steps of: rotating a tire on a drum; cutting a portion of an outer circumferential surface of the tire with a rotating cylindrical cutting tool; interrupting the cutting process with a plurality of grooves formed in a cutting edge of the cylindrical cutting tool, the interruption step occurring approximately every 5mm or less of rotation of the cutting edge of the cylindrical cutting tool.
  • FIG. 1 is a schematic view of a tire machining machine according to an embodiment of the invention.
  • FIG. 2 is a perspective view of an embodiment of a cylindrical cutter tool
  • FIG. 3 is an axial view of the cutter tool of FIG. 2;
  • FIG. 4 is a detail axial view of the cutting edge and grooves formed in the cutter tool ofFIG. 2;
  • FIG. 5 is a side elevational view of the cutter tool of FIG 2;
  • FIG. 6 is a detail cross-sectional view of the cutter tool of FIG. 2 cutting the outer surface of a tire
  • FIG. 7 is an axial view of another embodiment of a cylindrical cutter
  • FIG. 8 is a cross-sectional view of the cutter of FIG 7.
  • FIG. 9 is a side view of still another embodiment of a cylindrical cutter.
  • FIG. 1 is a schematic view of a machine 110 for machining tire treads in accordance with an embodiment of the invention.
  • the machine 110 comprises a first fixed frame 112 supporting a drum 140 on which is mounted a tire 120.
  • the machine 110 also comprises a mobile frame 114 supporting a tool holder 116.
  • the mobile frame 114 is mounted on a fixed base 117 by means of two pairs of rails 118.
  • the rails 118 are oriented perpendicularly to the axis of rotation 122 of the tire 120 and permit translational movement of the mobile frame 114 towards or away from the tire 120.
  • the rails 115 are oriented parallel to the axis of rotation 122 of the tire 120 and permit translational displacement of the mobile frame 114 parallel to the axis of rotation 122 of the tire 120. The combination of these two translational movements allows the cutting tool holder to follow all the conventional tire profiles.
  • the mobile frame 114 also allows vertical displacement of the tool holder 116, due to conventional means which are not shown.
  • the machine additionally comprises means (not shown) of setting the tire 120 in rotation, of reversing its direction of rotation, and of controlling the displacements of the mobile frame 114 and the vertical position of the tool holder 116.
  • the machine 110 as described is presented for example only and is not intended to be limiting on the present invention.
  • the tool holder 116 is intended to hold a cutting tool comprising at least one cylindrical cutting tool 10.
  • FIG. 1 shows the cutting tool 10 in position for machining the tire 120.
  • the tool holder 116 may swing vertically about the horizontal axis 125 in order, as described below, to bring the cutting edge 20 of the cutting tool 10 into contact with the tire 120.
  • the cutting machine 110 may further comprise a sharpening tool 145, typically a stone or grinding wheel that engages the cutting tool 10 to keep the cutting tool sharpened.
  • the cutting tool 10 comprises a cylindrical body 12 having an annular bevel 14 formed in an end 16 of the cylindrical body 12.
  • the annular bevel 14 forms a circular cutting edge 20 at an outer circumferential surface 18 of the cylindrical body 12.
  • the cylindrical body diameter, d may be of the order of 150 mm, for example.
  • the cutting tool 10 further comprises a plurality of grooves 30 formed in the outer circumferential surface 18 of the cylindrical body 12 the plurality of grooves 30 creating a discontinuities in the circular cutting edge 20.
  • a pair of adjacent grooves 32 of the plurality of grooves 30 are spaced about the cylindrical body 12 at a pitch period, P, and at least one groove 32 has a circumferential width, W, a radial depth, D.
  • the pitch period P of the grooves 32 is less than 5mm. It should be noted that there is no requirement for the pitch period P to be constant but may vary if desired.
  • the circumferential width W of the groove 32 is 2 mm or less.
  • the radial depth D of the groove 32 is 2 — 5 mm and a corresponding radial thickness or the cutting tool 10 generally at 5 - 10 mm.
  • the annular bevel 14 forms an acute angle, ⁇ , with a cylindrical axis 13 of the cylindrical body 12.
  • the angle ⁇ is about 18 to 45 degrees; in a further embodiment, the angle ⁇ is about 25 to 45 degrees. While measurements relating to the cutting tool have been provided, these are intended as examples and are not contemplated to be limiting the invention in any way.
  • the tool holder 116 is mounted rotationally about a horizontal axis 125 substantially parallel with the rotational axis 122 of the tire 120, which allows adjustment (due to means which are not shown) of the rake angle.
  • FIG. 6 a detail view of the cutting tool 10 is shown cutting the tire 120.
  • the rake angle, ⁇ is produced by positioning the cutting tool 10 at a predetermined position. Having the proper rake angle helps determine the final surface roughness of the tire.
  • the rake angle ⁇ is 50 degrees or less; however the same is for example only and it not intended to limit the invention.
  • the method for cutting the tread of a tire comprises the steps of: rotating a tire 120 on a drum 140 of a tire cutting machine 110; cutting a portion of an outer circumferential surface of the tire 120 with a rotating cylindrical cutting tool 10; and interrupting the cutting process with a plurality of grooves 30 formed in a cutting edge 20 of the cylindrical cutting tool 10, the interruption step occurring approximately every 5mm or less of rotation of the cutting edge 20 of the cylindrical cutting tool 10.
  • the grooves 30 allow the cut rubber strip to be divided into short portions and thus prevent a jam from forming in the cutting path.
  • grooves 30 subsequently occurring teeth on the cutting edge 20
  • a bonding agent such as an uncured rubber layer
  • cut rubber portions are obtained which are approximately 2mm in length, instead of 10mm to several meters as in the prior art.
  • the cutting tool 10 is translated in a direction laterally across the tread of the tire 120 (axially with respect to the tire) to provide complete coverage of the tire 120.
  • the tread cutting may be accomplished by several passes according to the amount of material being removed with each pass.
  • the tread cutting depth may be set to 5mm per pass until the desired amount of tread is removed.
  • An additional tread removal pass at a smaller depth, for example 0.5mm, can then be made to further increase the surface roughness.
  • the method described is an example only and is not intended to limit the invention in any way.
  • RMA Rubber Manufacturers Association
  • the RMA surface roughness is based primarily on a macro roughness classification of the surface.
  • the method and cutting tool 10 of an embodiment of the present invention provides a micro roughness that is suitable for retreading even though the macro-surface roughness provided by the process may be classified as an RMA2. This allows the present invention to provide both cutting and surface roughness in a single effective operation without requiring a secondary roughening step with wire brushes or other abrasive means.
  • the annular bevel 14' is formed in an end 16' of the cylindrical body 12' forming a circular cutting edge 20' at an inner circumferential surface 19 of the cylindrical body 12'.
  • the cutting tool 10' further comprises a plurality of grooves 30' formed in the inner circumferential surface 19 of the cylindrical body 12', the plurality of grooves 30' creating discontinuities in the circular cutting edge 20'.
  • FIG. 9 Still another embodiment of the cutting tool 10" is shown in FIG. 9. hi this embodiment, the grooves 30" are helically formed, whereas the grooves 30, 30' of the previous embodiments were generally formed axially. Each groove 32" thus has inclined edges instead of normal edges, as is the case with the cutting tools 10, 10'. This effectively provides the cutting edge 20" of the cutting tool 10" with a leading edge and a trailing edge, which may facilitate severing of the cut strips.
  • grooves 30, 30', 30" is not limited to the geometry shown herein. It is contemplated that the grooves could also be triangular, saw-tooth, partially curved, or any other appropriate shape for providing a discontinuity in the cutting edge 20, 20',

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Milling Processes (AREA)
  • Tyre Moulding (AREA)

Abstract

L'invention concerne une machine, un procédé et un outil de découpe comportant un corps cylindrique ; un biseau annulaire formé dans une extrémité du corps cylindrique et possédant un bord coupant circulaire au niveau d'une surface circonférentielle extérieure du corps cylindrique ou d'une surface circonférentielle intérieure du corps cylindrique ; une pluralité de rainures formées dans la surface circonférentielle extérieure du corps cylindrique ou dans la surface circonférentielle intérieure du corps cylindrique, laquelle pluralité de rainures crée des discontinuités dans le bord coupant circulaire ; au moins deux rainures adjacentes parmi la pluralité de rainures sont espacées autour du corps cylindrique à un pas de 5 mm, ou moins.
PCT/US2006/045868 2006-11-30 2006-11-30 Préparation de rechapage Ceased WO2008066533A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2006/045868 WO2008066533A2 (fr) 2006-11-30 2006-11-30 Préparation de rechapage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2006/045868 WO2008066533A2 (fr) 2006-11-30 2006-11-30 Préparation de rechapage

Publications (2)

Publication Number Publication Date
WO2008066533A2 true WO2008066533A2 (fr) 2008-06-05
WO2008066533A3 WO2008066533A3 (fr) 2008-12-04

Family

ID=39468396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/045868 Ceased WO2008066533A2 (fr) 2006-11-30 2006-11-30 Préparation de rechapage

Country Status (1)

Country Link
WO (1) WO2008066533A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023066433A1 (fr) * 2021-10-21 2023-04-27 Continental Reifen Deutschland Gmbh Procédé de classification de la texture de surface de produits en caoutchouc

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036275A (en) * 1974-04-12 1977-07-19 Branick Charles E Tire stripping apparatus
FR2824008A1 (fr) * 2001-04-26 2002-10-31 Michelin Soc Tech Outil d'usinage de pneumatiques
US6745809B1 (en) * 2002-12-09 2004-06-08 Bandag Licensing Corporation Tire buffing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023066433A1 (fr) * 2021-10-21 2023-04-27 Continental Reifen Deutschland Gmbh Procédé de classification de la texture de surface de produits en caoutchouc

Also Published As

Publication number Publication date
WO2008066533A3 (fr) 2008-12-04

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