US20020119209A1 - Tire vulcanizing mold - Google Patents

Tire vulcanizing mold Download PDF

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Publication number
US20020119209A1
US20020119209A1 US10/073,409 US7340902A US2002119209A1 US 20020119209 A1 US20020119209 A1 US 20020119209A1 US 7340902 A US7340902 A US 7340902A US 2002119209 A1 US2002119209 A1 US 2002119209A1
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US
United States
Prior art keywords
molding surface
mold
vent means
tread portion
tire
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.)
Abandoned
Application number
US10/073,409
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English (en)
Inventor
Hideaki Tanaka
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Assigned to BRIDGESTONE CORPORATION reassignment BRIDGESTONE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANAKA, HIDEAKI
Publication of US20020119209A1 publication Critical patent/US20020119209A1/en
Priority to US11/407,919 priority Critical patent/US7290996B2/en
Abandoned legal-status Critical Current

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    • 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
    • B29D30/0629—Vulcanising moulds not integral with vulcanising presses with radially movable sectors
    • 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
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • 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
    • B29D2030/0614—Constructional features of the moulds porous moulds, e.g. sintered materials
    • 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
    • B29D2030/0616—Surface structure of the mould, e.g. roughness, arrangement of slits, grooves or channels
    • 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
    • B29D2030/0617—Venting devices, e.g. vent plugs or inserts
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/812—Venting

Definitions

  • the present invention relates to a vulcanizing mold for producing pneumatic tires.
  • Vulcanizing mold for pneumatic tires has inner surface that is provided with ridges for defining the tread pattern of the product tire.
  • air tends to be trapped between the inner surface of the mold and the outer surface of a green tire upon vulcanization thereof.
  • the ridges of the mold and the unvulcanized rubber of the green tire are brought into tight contact with the mold surface and thereby prevent effective discharge of air from the mold cavity.
  • air trapped between the mold surface and the rubber surface forms voids or the like surface defects (so-called “bares”) in the outer surface of the product tires, thereby lowering the commercial value of the product tire.
  • JP-A-2001-18235 discloses a segmented-type vulcanizing mold including a plurality of mold pieces for forming a tread portion of the tire, which are assembled with each other in the circumferential direction of the tire.
  • Each mold piece has a molding surface provided with various ribs for forming a tread pattern of the tire, and end surfaces where adjacent mold pieces are in abutment with each other when they are assembled.
  • the end surface of the mold piece includes an edge region adjacent to the molding surface and extending in a width direction of the tread portion.
  • the mold piece has a vent passage communicating with atmosphere, formed of a narrow gap that extends along the edge region partly in the width direction of the tread portion.
  • the vulcanizing mold disclosed in JP-A-2001-18235 proved to be highly advantageous in that the vent passage in the form of a narrow gaps along the edge region of each mold piece can be formed in a facilitated manner, more or less eliminating difficult and time-consuming machining of fine apertures in the mold pieces.
  • a vulcanizing mold for pneumatic tires comprising a plurality of mold pieces for forming a tread portion of the tire, wherein the mold pieces cam be assembled with each other side by side in a circumferential direction of the tire.
  • the mold pieces each comprises a molding surface for forming a tread pattern of the tire tread portion, and end surfaces on both sides of the molding surface as seen in the circumferential direction of the tire, where adjacent mold pieces are in abutment with each other when they am assembled.
  • the end surfaces of the mold piece each includes an edge region situated adjacent to the molding surface to extend in a width direction of the tread portion.
  • the mold pieces each comprises (i) a first vent means comprised of a narrow gap formed by continuously removing said edge region over substantially entire width of the tread portion, wherein the first vent means is in communication with atmosphere, and (ii) a second vent means comprised of fine unevenness on the molding surface of the mold piece, wherein the second vent means is in communication with the first vent means.
  • the narrow gap forming the first vent means extends along the edge region of the end surface adjacent to the molding surface of the mold piece, over substantially entire width of the tread portion.
  • the molding surface of the mold piece has fine unevenness forming the second vent means that is in communication with the narrow gap of the first vent means.
  • air remaining therebetween can be effectively discharged into atmosphere, through the vent passage provided by the fine unevenness on the molding surface of the mold piece, and subsequently though the narrow gap of the first vent means. It is therefore possible to positively prevent formation of surface defects in the outer surface of the product tires, and to provide product tires with an improved appearance.
  • the second vent passage ensuring an effective discharge of air from the mold cavity is in the form fine unevenness and, hence, does not affect the appearance of the product ties.
  • the second vent means is comprised of narrow grooves, which are provided on the molding surface of the mold piece in a region corresponding to a land of the tread portion, so as to extend substantially continuously in the circumferential direction of the tire.
  • the above-mentioned arrangement of the second vent means makes it possible effectively to discharge air remaining within the mold cavity into the narrow gap of the first vent means and eventually into atmosphere, through the narrow grooves in the molding surface extending substantially continuously in the circumferential direction of die tire, thereby positively avoiding formation of surface defects in the outer surface of product Ores.
  • Formation of narrow grooves at the region of the molding surface that corresponds to a land in the tire tread portion is highly advantageous, since such surface region otherwise tends to cause air traps.
  • the narrow grooves in the molding surface extending substantially continuously in the circumferential direction of the tire can be formed in a facilitated manner without requiring complicated machining on the molding surface of the mold piece.
  • each of the narrow grooves has a width and/or depth within a range of 0.1 mm to 0.3 mm.
  • the width and/or depth of the narrow grooves in excess of 0.3 mm may affect the appearance of the product tires due to the narrow grooves by themselves, while the width and/or depth less than 0.1 mm make it difficult to effectively discharge air into the narrow gap of the first vent means at the end surface of the mold piece, and may cause surface defects in the product tires.
  • the second vent means is comprised of an air passage extending along a root portion of a narrow rib, which is provided on the molding surface of the mold piece in a region corresponding to a land of the tread portion, so as to extend substantially continuously in the circumferential direction of the tire.
  • the above-mentioned arrangement of the second vent means also makes it possible effectively to discharge air remaining within the mold cavity into the narrow gap of the first vent means and eventually into atmosphere, through the air passage that extends along the narrow rib on the molding surface substantially continuously in the circumferential direction of the tire, thereby positively avoiding formation of surface defects in the outer surface of product tires. Formation of narrow ribs at the region of the molding surface that corresponds to a land in the tire tread portion is highly advantageous, since such surface region otherwise tends to cause air traps.
  • the narrow ribs extending substantially continuously in the circumferential direction of the tire may be advantageously used to form narrow grooves in the outer surface of the product tire at a land in the tread surface, which are arranged with a regular pattern to provide a desired ornamental appearance.
  • the narrow rib defining the air passage along its root can be formed in a facilitated manner, simply by linearly forming a narrow groove in a master of the mold piece for preparing the latter by casting, so that the narrow groove in the master is complementary to the narrow rib in the mold piece.
  • the rib has a width of 0.3 mm or less and a height within a age of 0.1 mm to 0.3 mm.
  • the width and/or height of the narrow rib in excess of 0.3 mm may affect the appearance of the product tire, while the height of less than 0.1 mm makes it difficult to effectively discharge air into the narrow gap of the first vent means at the end surface of the mold piece, and may cause surface defects in the product tires.
  • the second vent means is comprised of a plurality of narrow grooves and at least one other groove intersecting the narrow grooves at not less than one point of each of them, wherein the narrow grooves and the at least one other groove are formed in the molding surface of the mold piece in a region corresponding to a land of the tread portion.
  • the above-mentioned arrangement of the second vent means makes it possible effectively to discharge air remaining within the mold cavity into the narrow gap of the first vent means and eventually into atmosphere, through the narrow grooves and at least one other groove in the molding surface, thereby positively avoiding formation of surface defects in the outer surface of product tires.
  • Formation of these grooves in the region of the molding surface that corresponds to a land in the tire tread portion is highly advantageous, since such surface region otherwise tends to cause air taps.
  • the narrow grooves and at least one other groove in the molding surface may be advantageously used to form narrow ribs in the outer surface of the product tire at a land in the tread surface, which are arranged with a regular pattern to provide a desired ornamental appearance.
  • these grooves can be formed in the molding surface in a facilitated manner, without requiring complicated machining of the molding surface of the mold piece.
  • each of these grooves has a width and/or depth within a range of 0.1 mm to 0.3 mm.
  • the width and/or depth of the groove in excess of 0.3 mm may affect the appearance of the product tires due to the narrow grooves by themselves, while the width and/or depth less than 0.1 mm make it difficult to effectively discharge air into the narrow gap of the first vent means at the end surface of the mold piece, and may cause surface defects in the product tires.
  • the second vent means is comprised of recesses that are in communication with each other, and formed by a surface treatment of the molding surface, at a region corresponding to a land in the tread portion, to have a surface roughness within a range of 20 ⁇ m to 60 ⁇ m.
  • the above-mentioned arrangement of the second vent means makes it possible effectively to discharge air remaining within the mold cavity into the narrow gap of the first vent means and eventually into atmosphere, through the recesses in the molding surface, thereby positively avoiding formation of surface defects in the outer surface of product tires.
  • Formation of the recesses in the region of the molding surface that corresponds to a land in the tire tread portion is highly advantageous, since such surface region otherwise tends to cause air traps.
  • the recesses can be readily formed by a suitable surface treatment, such as sand blasting of the molding surface, to have a desired surface roughness within a specified range.
  • the recesses in the molding surface may be advantageously used to provide a mesh pattern in the outer surface region of the product tire at a land in the tread surface, which provides a desired ornamental appearance.
  • the surface roughness in excess of 60 ⁇ m may affect the appearance of the product tire due to an excessive roughness in the outer surface, while the surface roughness of less than 20 ⁇ m makes it difficult to effectively discharge air into the narrow gap of the first vent means at the end surface of the mold piece, and may cause surface defects in the product tires.
  • a vulcanizing mold for pneumatic tires comprising a plurality of mold pieces for forming a tread portion of the tire, wherein said mold pieces an be assembled with each other side by side in a circumferential direction of the tire.
  • the mold pieces each comprises a molding surface for forming a tread pattern of the tire tread portion, and end surfaces on both sides of the molding surface as seen in the circumferential direction of the fire, where adjacent mold pieces are in abutment with each other when they are assembled.
  • the end surfaces of the mold piece each includes an edge region situated adjacent to the molding surface to extend in a width direction of the tread portion.
  • the mold pieces each comprises (i) a first vent means comprised of a narrow gap formed by continuously removing the edge region over substantially entire width of the tread portion, wherein the first vent means is in communication with atmosphere, and (ii) a second vent means comprised of one or more fine apertures, wherein the second vent means is formed in the molding surface of the mold piece at a region corresponding to a land in de tread portion and isolated from the first vent means, wherein the second vent means also is in communication with atmosphere.
  • the structure of the vulcanizing mold according to the second aspect of the present invention is essentially the same as the first aspect explained above, in that the narrow gap forming the first vent means extends along the edge region of the end surface adjacent to the molding surface of the mold piece, over substantially entire width of the tread portion.
  • the narrow gap with a reduced width is particularly advantageous for effectively preventing formation of spews.
  • the narrow gap along the end surface of the mold piece can be formed in a facilitated manner.
  • the molding surface of the mold piece has one or more fine apertures forming the second vent means that is in communication with atmosphere, wherein the second vent means is situated at a region corresponding to a land in the tread portion and isolated from the first vent means.
  • the second vent passage ensuring an effective discharge of air from the mold cavity is in the form of fine apertures and, hence, does not allow rubber to be extruded therethrough to form spews on the outer surface of the product ire.
  • the appearance of the product tire is not affected since the second vent means is situated at the region of the molding surface, which otherwise tends to cause air traps.
  • the fine apertures forming the second vent means in the molding surface are formed in an air-permeable, sintered plate member.
  • the fine apertures can be realized in a facilitated manner, simply by using air-permeable, sintered plate member, without requiring time consuming machining in the molding surface.
  • the sintered plate member has a pore size or filtration rating (JIS B0142) which is preferably within a range of 5 ⁇ m to 40 ⁇ n.
  • the filtration rating less than 5 ⁇ m makes it difficult to effectively discharge air into atmosphere, and may cause surface defects in the product tires, beside that fine foreign matters tend to clog the apertures in the sintered plate member.
  • filtration rating in excess of 40 ⁇ m tends to cause rubber material to be forced into the apertures of the sintered plate member, thereby clogging the apertures.
  • the filtration rating within the preferred range effectively prevents clogging of the sintered plate member, which tends to cause surface defects in the product tire.
  • the fine aperture forming the second vent means in the molding surface is formned of a narrow clearance extending at least partly around an insert member inserted into the mold piece and having a tip end surface that forms part of said molding surface. In this way, it is possible to form the fine aperture of the second vent means in a positive and facilitated manner.
  • the narrow clearance around the insert member has a width within a range of 0.02 mm to 0.1 mm, and a depth within a range of 0.1 mm to 2 mm.
  • the width less than 0.02 mm and/or the depth in excess of 2 mm lead to insufficient ability for discharging air, enhancing the tendency of surface defect formation and/or clogging of the narrow clearance by fine foreign matters.
  • the width in excess of 0.1 mm increases the height of the rubber forced into the clearance, resulting in unsatisfactory appearance of the product tire.
  • the depth less than 0.1 mm causes the rubber forced into the clearance to be left therein, thereby clogging the narrow clearance. The clogging, in turn, leads to insufficient ability for discharging air, thereby enhancing the tendency of surface defect formation.
  • the fine aperture forming the second vent means in the molding surface comprises a slit-like aperture in a top surface of a tubular pin member, which is inserted into the mold piece so that the top surface forms part of the molding surface. In this way, it is possible to form the fine aperture of the second vent means in a positive and facilitated manner.
  • the slit-like aperture has a width within a range of 0.02 mm to 0.1 mm, and a depth within a range of 0.1 mm to 2 mm.
  • the width less than 0.02 mm and/or the depth in excess of 2 mm lead to insufficient ability for discharging air, enhancing the tendency of surface defect formation and/or clogging of the narrow clearance by fine foreign matters.
  • the width in excess of 0.1 mm and/or the depth less than 0.1 mm causes the rubber forced into the clearance to be left therein, thereby clogging the narrow clearance, The clogging, in turn, leads to insufficient ability for discharging air, thereby enhancing the tendency of surface defect formation.
  • the narrow gap of the first vent means has a width within a range of 0.005 mm to 0.1 mm.
  • the width less than 0.005 mm of the narrow gap leads to insufficient ability for discharging air, enhancing the tendency of surface defect formation.
  • the width in excess of 0.1 mm tends to cause spews, resulting in inferior appearance of the product tire.
  • the first vent means further comprises a groove formed in each of the end surfaces at a location spaced from the molding surface, wherein the groove is wider than the narrow gap and in communication with the narrow gap and atmosphere.
  • the groove provides an increased cross-sectional area of the air passage and thus serves to effectively discharge air into atmosphere.
  • the narrow gap of the first vent means extends along that portion of the molding surface, which corresponds to a land in the tread portion. Since air tends to be trapped at the molding surface portion corresponding to a land in the tread portion, where a space is defined by the ridges on the mold surface and the unvulcanized rubber, the narrow gap serves to effectively discharge air into atmosphere.
  • FIG. 1 is a schematic view showing tie entirety of the segmented tie mold according to a first embodiment of the present invention.
  • FIG. 2 is a plan view showing a part of the molding surface thereof.
  • FIG. 3 is a plan view showing the molding surface of a mold piece.
  • FIG. 4 is a side view as seen from the abutment surface side of the mold piece.
  • FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 3.
  • FIG. 6 is a cross-sectional view showing the details of the narrow groove in FIG. 4.
  • FIG. 7 is a plan view showing the molding surface of a mold piece in the segmented tire mold according to a second embodiment of the present invention.
  • FIG. 8 is a cross-sectional view showing the details of the narrow rib in the mold piece shown in FIGS. 6 and 7.
  • FIG. 9 is a plan view showing the molding surface of the mold piece in the segmented tire mold according to a third embodiment of the present invention.
  • FIG. 11 is a plan view showing the molding surface of the mold piece in the segmented tire mold according to a fifth embodiment of the present invention.
  • FIGS. 12 ( a ) and 12 ( b ) are plan view and cross-sectional view, respectively, showing the details of the fine air-vent apertures in the mold piece of FIG. 11.
  • FIG. 13 is a plan view showing the molding surface of a mold piece in the segmented tire mold according to a sixth embodiment of the present invention.
  • FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. 13.
  • FIG. 15 is a plan view showing the molding surface of the mold piece in the segmented tire mold according to a seventh embodiment of the present invention.
  • FIG. 16 is a cross-sectional view showing the details of fine air-vent apertures in the mold piece of FIG. 16.
  • FIG. 1 shows a tire vulcanizing mold 1 , which is a segmented type mold circumferentially divided into a plurality of segments, typically into seven to nine segments of holders 2 (seven segments in FIG. 1).
  • Each holder 2 serves to hold, on its inner surface, a plurality of segmented mold pieces for providing a desired pattern to a tread portion of a tire. To this end, it is assumed that the molding surfaces of the mold pieces are faced radially inwards.
  • the holders 2 holding the associated mold pieces 10 are movable radially outwards or inwards.
  • the holders 2 are moved radially outwards and thereby spread simultaneously so that a green tire G made of unvulcanized robber material is set at the center of the holders 2 .
  • the holders 2 are then simultaneously moved radially inwards so that they are combined or assembled with one another, thereby forming an annular mold for vulcanizing the green tire G.
  • FIG. 2 shows a part of the molding surface of the mold.
  • the molding surface is formed by assembling the mold pieces 10 in the circumferential direction of the tire, i.e., by arranging the mold pieces 10 side-by-side at the abutment surfaces 12 , respectively.
  • Each abutment surface 12 continuously extends from one shoulder portion of a product tire to the other shoulder portion.
  • the abutment surface 12 is provided with a narrow gap 17 along the edge portion adjacent to the molding surface.
  • the narrow gap 17 forms part of vent means for discharging air from the mold cavity into atmosphere.
  • the abutment surfaces 12 on the opposite sides of each mold piece is formed of seven planes that are connected to one another at six points, so that the seven planes on one side of the mold piece are parallel to the corresponding seven planes on the opposite side of the same mold piece, respectively.
  • the molding surface 11 is provided with ridges 13 corresponding to grooves in the tread portion of a product tire.
  • the ridges 13 define molding surfaces 14 that correspond to lands in the tread portion of the product tire.
  • each molding surface 14 is provided with narrow grooves 21 that extend in the circumferential direction of the tire.
  • the green tire G made of unvulcanized rubber material in brought into progressive adhesion to the molding surface 11 of the mold, such that each ridge 13 firstly adheres to the green tire G.
  • air spaces are left on the molding surface 14 , until the molding surface 14 completely adheres to the green tire G.
  • the narrow gaps 17 are provided along the molding surfaces 14 for lands, thereby allowing effective discharge of air from the mold cavity.
  • the molding surfaces 14 corresponding to lands are provided with narrow grooves 21 which extend in the circumferential direction of the tire so as to communicate with the narrow gaps 17 , respectively.
  • FIG. 3 and FIG. 4 are views showing of one mold piece 10 , as seen from the side of the molding surface 11 and from the side of abutment surface 12 , respectively.
  • the molding surface 11 of the mold piece 10 is gradually curved from the widthwise center of the tire toward a position just before each shoulder portion.
  • the side edge portion of one of abutment surfaces 12 is continuously cut out with a small width over the substantially the entirety of the abutment surface 12 , including the ridges 13 , such that the cut-out forms the narrow gap 17 between the neighboring mold pieces 10 , as shown in FIG. 5, in which the narrow gap 17 has a width t of 0.03 mm and a depth v of 2 mm.
  • the narrow gap 17 having a width t within a range of 0.005 to 0.05 mm makes it possible effectively to avoid formation of spews and occurrence of surface defects at locations near the abutment surfaces 12 , without application of vacuum.
  • a groove 18 having a width larger than the width t of the narrow gap 17 , and a depth w of 2 mm larger than the depth v of the piece edge gap 17 .
  • the depth w of the groove 18 may be within a range of 1 to 3 mm. Provision of the relatively wide groove 18 allows to increase the air passage sectional area, to thereby provide a higher air discharging effect
  • the groove 18 is communicated with the back surface of the mold piece 10 by passages 19 each having a sectional area larger than that of the narrow gap 17 .
  • FIG. 6 is a cross-sectional view of the narrow groove 21 in the molding surface 14 , that extends in the circumferential direction of the tire so as to communicate with the narrow gap 17 .
  • the groove 21 has, in its cross-section, a width w 1 of 0.2 mm and a depth h 1 of 0.2 mm.
  • the cross section of the groove 21 has dimensions including the width w 1 of 0.1 to 0.3 mm and the depth h 1 of 0.1 to 0.3 mm.
  • FIG. 7 is a plan view showing a molding surface of a mold piece 10
  • FIG. 8 is a cross-sectional view showing details of a narrow rib.
  • the molding-surface 14 corresponding to the land of the fad portion is provided with narrow ribs 26 so that air passages communicating with the narrow gap 17 in the abutment surface 12 are formed on the molding surface 14 by the root portions of the narrow ribs 26 , respectively.
  • air can be positively discharged to the exterior of the mold, via the air passage on the molding surface 14 and also via the narrow gaps 17 in the abutment surface 12 , even just before the molding surface 14 completely adheres to the green tire G, without leaving air spaces.
  • the rib 26 shown in FIG. 8 has a width w 2 of 0.2 mm and a height h 2 of 0.2 mm.
  • the width w 2 is within a range of 0-3 mm or less
  • the height h 2 is within a range of 0.1 to 0.3 mm.
  • FIG. 9 is a plan view showing the molding surface of a mold piece according to a third embodiment of the present invention.
  • the molding surface 14 corresponding to each land of a tread portion is formed with air passages communicating with the narrow gap 17 in the abutment surface 12 , by cross-pattered narrow grooves 31 .
  • air can be positively discharged to the exterior of the mold, from piece edge gaps 17 via cross-patterned narrow grooves 31 in the molding surface 14 , even just before the molding-surface 14 completely adheres to the green tire G, without leaving air spaces.
  • each groove has a width within a range of 0.1 mm to 0.3 mm and a depth within a range of 0.1 mm to 0.3 mm.
  • FIG. 10 is a plan view showing the molding surface of a mold piece 10 according to a fourth embodiment of the present invention.
  • the molding surface 14 corresponding to the land of the tread portion is finished to have a surface roughness of 40 ⁇ m.
  • air can be positively discharged to the exterior of the, mold, via mesh-like concave portions of the roughened molding surface 41 of the piece having the surface roughness of 40 ⁇ m and also the narrow gap 17 in the abutment surface 12 , even just before the molding surface 14 completely adheres to the green tire G, without leaving air spaces.
  • the preferable range of the surface roughness is 20 ⁇ m to 60 ⁇ m.
  • FIG. 11 is a plan view showing a molding surface of a mold piece 10 according to a fifth embodiment of the present invention.
  • FIG. 12 is a cross-sectional view showing the details of an aperture.
  • an air-permeable sintered plate member 52 is arranged for forming the air discharging fine aperture.
  • a sleeve 53 attached with the sintered plate member 52 is embedded so that the end surface of the sleeve 53 and the outer surface of the sintered plate member 52 form part of the molding surface 14 of the mold piece 10 .
  • the air-permeable sintered plate members 52 are arranged at positions likely to cause residual air spaces so as to dissolve any residual air spaces and thereby effectively avoid formation of surface defects.
  • the preferable range in terms of filtration rating of the sintered plate member 52 is 5 ⁇ m to 40 ⁇ m.
  • FIG. 12 is a cross-sectional view showing a mounting method of the sintered plate member 52 .
  • the base material of the mold piece 10 such as cast aluminum, is formed with a bore extending from the molding surface 14 toward the back surface. This bore is inserted with the sleeve 53 made of steel that is fixed to the bore by press-fit or the like.
  • the sleeve 53 is provided with an attaching portion for the sintered plate member 52 thereto in a readily replaceable manner.
  • the sintered plate member 52 is clogged to thereby deteriorate the air discharging effect
  • the clogged plate member 52 can be replaced by a new one by a suitable tool. In this way, the air discharging effect can be readily recovered, thereby allowing use of the mold over a prolonged period.
  • FIG. 13 is a plan view showing a molding surface of the mold piece 10
  • FIG. 14 is a cross-sectional view of the mold showing details of an air discharging fine aperture.
  • a pin 61 having a lip end surface forming part of the molding surface 14
  • a narrow clearance 62 is defined around the pin 61 for forming an air discharging fine aperture.
  • the narrow clearance 62 around the pin 61 has a width w 5 , and extends over a depth h 5 from the molding surface 14 of the mold piece 10 . At that side of the narrow clearance 62 opposite to the molding surface, there is formed a relatively wide gap having a width larger than the width w 5 , thereby improving air discharging effect.
  • the preferable range of the narrow clearance 62 is 0.02 mm to 0.1 mm for the width w 5 , and 0.1 mm to 2 mm for the depth h 5 .
  • the pin 61 is prepared from a metal material different from the cast aluminum acting as the base material of the mold piece 10 .
  • the surface of the pin 61 is pressure-adhered with a water-soluble salt, such as sodium chloride or potassium chloride.
  • the mold piece is then cast, with the pin 61 maintained in the desired location.
  • the pressure-adhered salt on the pin 61 is eluted, thereby forming the narrow clearance 62 at an interface between the mold piece 10 and pin 61 .
  • FIG. 15 is a plan view showing a molding surface of the mold piece 10
  • FIG. 16 is a cross-sectional view showing the details of air discharging fine aperture.
  • a cylindrical member 71 having a top surface, which forms part of the molding surface 14 .
  • the top surface of the cylindrical member 71 is provided with a slit 72 forming an air discharging fine aperture.
  • the air spaces caused at a location isolated from the narrow gap 17 can be directly discharged to the exterior of the mold, through each slit 72 .
  • the preferable range of the slit 72 is 0.02 mm to 0.1 mm for width w 6 , and 0.1 mm to 2 mm for depth h 6 .
  • the vulcanizing mold according to the present invention is capable of positively discharging air near the narrow gap in the abutment surface without forming spews or surface defects, without application of vacuum.
  • the air spaces caused at locations spaced from the narrow gaps can also be discharged via air passages communicated with the narrow gaps; or directly through fine apertures provided at locations isolated from the narrow gaps; to thereby avoid occurrence of spews or surface defects.

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)
US10/073,409 2001-02-15 2002-02-13 Tire vulcanizing mold Abandoned US20020119209A1 (en)

Priority Applications (1)

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JP2001037939A JP2002240042A (ja) 2001-02-15 2001-02-15 タイヤ加硫成型用金型
JP2001-037939 2001-02-15

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JP (1) JP2002240042A (fr)
DE (1) DE60214785T2 (fr)
ES (1) ES2272642T3 (fr)

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US20050167871A1 (en) * 2004-01-29 2005-08-04 Sunil Kesavan Gas-permeable molds for composite material fabrication and molding method
US20070009623A1 (en) * 2002-12-07 2007-01-11 Lahr Nile A Annular venting of tire tread molds
US20070284783A1 (en) * 2006-06-13 2007-12-13 Toyo Tire & Rubber Co., Ltd. Mold For Molding Tire And Pneumatic Tire Molded By The Same
US20080305196A1 (en) * 2007-06-06 2008-12-11 Toyo Tire & Rubber Co., Ltd. Tire curing forming mold
US7524175B2 (en) 2004-12-22 2009-04-28 The Goodyear Tire & Rubber Company Method and apparatus to vent a mold
CN102729366A (zh) * 2011-04-05 2012-10-17 东洋橡胶工业株式会社 轮胎模具、充气轮胎的制造方法、以及充气轮胎
US20140378030A1 (en) * 2010-03-26 2014-12-25 Bridgestone Corporation Pneumatic tire and method of manufacturing tire vulcanization mold
US9308699B2 (en) 2010-05-31 2016-04-12 Compagnie Generale Des Establissments Michelin Moulding element comprising a plurality of ribs and at least one rib-free measurement zone
US9346230B2 (en) 2012-10-17 2016-05-24 Compagnie Generale Des Etablissements Michelin Molding element for a tire mold comprising a porous area
US9352522B2 (en) 2012-10-17 2016-05-31 Compagnie Generale Des Etablissements Michelin Molding element of a mold for a tire, comprising a plurality of holes
US20160185020A1 (en) * 2012-12-12 2016-06-30 Lg Hausys, Ltd. Apparatus for forming polymer, comprising polymer backflow prevention portion
US9463604B2 (en) 2012-10-17 2016-10-11 Compagnie Generale Des Etablissements Michelin Part for a mold for a tire, comprising an insert
US20210252747A1 (en) * 2018-07-21 2021-08-19 Compagnie Generale Des Etablissements Michelin Method for producing a molding element having an air discharge slot

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US8020595B2 (en) * 2004-11-30 2011-09-20 Bridgestone Corporation Pneumatic tire with tread having sipes and shallow grooves
DE102005023914A1 (de) * 2005-05-24 2006-11-30 Continental Aktiengesellschaft Reifenvulkanisierform mit mehreren zu einer umfangmäßig geschlossenen Form zusammenfügbaren Profilsegmenten und Verfahren zu deren Herstellung
JP4862684B2 (ja) * 2006-05-30 2012-01-25 横浜ゴム株式会社 タイヤ加硫用成形金型
JP4845638B2 (ja) * 2006-08-11 2011-12-28 東洋ゴム工業株式会社 タイヤ加硫成形型
DE102006042275A1 (de) * 2006-09-08 2008-03-27 Continental Aktiengesellschaft Verfahren zur Herstellung einer Vulkanisierform mit mehreren zu einer umfangsmäßig geschlossenen Form zusammenfügbaren Profilsegmenten und Vulkanisierform
JP4880422B2 (ja) * 2006-10-26 2012-02-22 東洋ゴム工業株式会社 タイヤ成形用金型におけるピースの製造方法
US8206143B2 (en) * 2007-12-13 2012-06-26 Biomet Manufacturing Corp. Modular articulating cement spacer
JP4690382B2 (ja) * 2007-12-21 2011-06-01 住友ゴム工業株式会社 タイヤ用モールドの製造方法
DE102008009123A1 (de) 2008-02-14 2009-08-20 Continental Aktiengesellschaft Reifenvulkanisierform und mit dieser Reifenvulkanisierform hergestellter Reifen
DE102008012045A1 (de) 2008-03-01 2009-09-03 Continental Aktiengesellschaft Vorrichtung zum Vulkanisieren von Fahrzeugreifen mit einer Vulkanisationsform
DE102009026293A1 (de) 2009-07-30 2011-02-10 Continental Reifen Deutschland Gmbh Vulkanisierform zum Vulkanisieren von Fahrzeugreifen
US8731871B2 (en) 2010-09-22 2014-05-20 Bridgestone Americas Tire Operations, Llc Tire mold design method to minimize unique annular mold parts
FR2969956B1 (fr) * 2010-12-30 2013-02-08 Michelin Soc Tech Moule de vulcanisation pour la vulcanisation et le moulage d'un pneumatique
JP5613198B2 (ja) * 2012-05-29 2014-10-22 住友ゴム工業株式会社 タイヤ加硫金型
DE102012109723A1 (de) * 2012-10-12 2014-04-17 Continental Reifen Deutschland Gmbh Vulkanisierform zum Vulkanisieren von Fahrzeugreifen
JP5702433B2 (ja) 2013-05-02 2015-04-15 株式会社ブリヂストン タイヤ成型用金型およびタイヤ
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JP6648415B2 (ja) * 2015-05-29 2020-02-14 住友ゴム工業株式会社 加硫金型及びそれに用いられるベントピース
JP6646434B2 (ja) * 2015-12-21 2020-02-14 Ｔｏｙｏ Ｔｉｒｅ株式会社 タイヤ加硫成型金型
US10814573B2 (en) 2017-07-20 2020-10-27 Bridgestone Americas Tire Operations, Llc Bead ring design improvement
EP3603946A3 (fr) * 2018-08-01 2020-02-12 Sumitomo Rubber Industries, Ltd. Moule de pneus, procédé de fabrication de pneu et pneu
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070009623A1 (en) * 2002-12-07 2007-01-11 Lahr Nile A Annular venting of tire tread molds
US8021136B2 (en) * 2002-12-07 2011-09-20 Cooper Tire & Rubber Company Annular venting of tire tread molds
US20050167871A1 (en) * 2004-01-29 2005-08-04 Sunil Kesavan Gas-permeable molds for composite material fabrication and molding method
US7524175B2 (en) 2004-12-22 2009-04-28 The Goodyear Tire & Rubber Company Method and apparatus to vent a mold
US20070284783A1 (en) * 2006-06-13 2007-12-13 Toyo Tire & Rubber Co., Ltd. Mold For Molding Tire And Pneumatic Tire Molded By The Same
US7802976B2 (en) * 2006-06-13 2010-09-28 Toyo Tire & Rubber Co., Ltd. Mold for molding tire and pneumatic tire molded by the same
US20080305196A1 (en) * 2007-06-06 2008-12-11 Toyo Tire & Rubber Co., Ltd. Tire curing forming mold
US7594804B2 (en) * 2007-06-06 2009-09-29 Toyo Tire & Rubber Co., Ltd. Tire curing forming mold
US20140378030A1 (en) * 2010-03-26 2014-12-25 Bridgestone Corporation Pneumatic tire and method of manufacturing tire vulcanization mold
US9393719B2 (en) 2010-03-26 2016-07-19 Bridgestone Corporation Pneumatic tire with specified outer surface
US9308699B2 (en) 2010-05-31 2016-04-12 Compagnie Generale Des Establissments Michelin Moulding element comprising a plurality of ribs and at least one rib-free measurement zone
CN102729366A (zh) * 2011-04-05 2012-10-17 东洋橡胶工业株式会社 轮胎模具、充气轮胎的制造方法、以及充气轮胎
CN102729366B (zh) * 2011-04-05 2015-04-29 东洋橡胶工业株式会社 轮胎模具、充气轮胎的制造方法、以及充气轮胎
US9346230B2 (en) 2012-10-17 2016-05-24 Compagnie Generale Des Etablissements Michelin Molding element for a tire mold comprising a porous area
US9352522B2 (en) 2012-10-17 2016-05-31 Compagnie Generale Des Etablissements Michelin Molding element of a mold for a tire, comprising a plurality of holes
US9463604B2 (en) 2012-10-17 2016-10-11 Compagnie Generale Des Etablissements Michelin Part for a mold for a tire, comprising an insert
US20160185020A1 (en) * 2012-12-12 2016-06-30 Lg Hausys, Ltd. Apparatus for forming polymer, comprising polymer backflow prevention portion
US10201920B2 (en) * 2012-12-12 2019-02-12 Lg Hausys, Ltd. Apparatus for forming polymer, comprising polymer backflow prevention portion
US20210252747A1 (en) * 2018-07-21 2021-08-19 Compagnie Generale Des Etablissements Michelin Method for producing a molding element having an air discharge slot

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US20060188593A1 (en) 2006-08-24
EP1232843B1 (fr) 2006-09-20
JP2002240042A (ja) 2002-08-28
US7290996B2 (en) 2007-11-06
EP1232843A3 (fr) 2004-07-21
EP1232843A2 (fr) 2002-08-21
DE60214785D1 (de) 2006-11-02
DE60214785T2 (de) 2007-09-13
ES2272642T3 (es) 2007-05-01

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