WO2015133589A1 - タイヤ成型用金型、及びタイヤの製造方法 - Google Patents
タイヤ成型用金型、及びタイヤの製造方法 Download PDFInfo
- Publication number
- WO2015133589A1 WO2015133589A1 PCT/JP2015/056567 JP2015056567W WO2015133589A1 WO 2015133589 A1 WO2015133589 A1 WO 2015133589A1 JP 2015056567 W JP2015056567 W JP 2015056567W WO 2015133589 A1 WO2015133589 A1 WO 2015133589A1
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- WIPO (PCT)
- Prior art keywords
- tire
- vent hole
- mold
- penetrating
- protrusion
- Prior art date
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Classifications
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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
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- 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
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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
- 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
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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)
- B29D30/72—Side-walls
- B29D2030/726—Decorating or marking the sidewalls before tyre vulcanization
Definitions
- the present invention relates to a tire molding die for molding a pneumatic tire having protrusions formed on the surface thereof, and a tire manufacturing method.
- a tire molding die for manufacturing a pneumatic tire provided with, for example, a protrusion that generates turbulent flow on the surface of the tire has been proposed (for example, see Japanese Patent Application Laid-Open No. 2012-029377).
- Protrusions for generating turbulent flow will not exhibit their original performance unless they are manufactured according to the shape (height, edge).
- vent holes are provided in the mold to eliminate air and form protrusions.
- the depression-forming depression A concave non-penetrating vent hole is provided in the recess for forming the projection.
- conventionally used tire molding dies are provided with a plurality of through-type vent holes for discharging air in the mold to the outside of the mold in order to suppress the occurrence of air accumulation in the mold. ing.
- the rubber flows out to the outside of the die through the short-type through-type vent hole and comes out of the through-type vent hole outside the die.
- the rubber may harden as a lump.
- spew rubber solidified in the vent hole
- spew is cut at an unintended part when removing the tire from the mold, and the through-type vent hole A spew that remains in the interior of the mold remains, and it takes time to clean the mold, which hinders productivity.
- an embodiment of the present invention aims to provide a mold for molding a tire and a method for manufacturing a tire that can improve the productivity of the tire by eliminating the trouble of cleaning the mold.
- a tire molding die is provided with a mold having a surface forming portion that makes contact with the surface of a raw tire and molds the outer surface of the tire, and is provided in the mold to form protrusions on the outer surface of the tire.
- the concave projection forming recess, the non-penetrating vent hole whose one end communicates with the projecting recess and the other end terminates in the mold, and has a larger volume than the non-penetrating vent hole.
- the non-penetrating vent hole is formed at a different position of the protrusion forming recess, and has a penetrating vent hole having one end communicating with the protrusion forming recess and the other end communicating with the outside of the mold. .
- the concave projection forming concave portion for forming the projection on the outer surface of the tire is provided in the mold, when the surface of the raw tire is pressed against the surface forming portion, The raw tire rubber enters the protrusion-forming recess.
- the rubber of the raw tire enters the protrusion forming recess, first, most of the air in the protrusion forming recess is discharged outside the mold through the through-type vent hole. Thereafter, a part of the rubber of the green tire that has entered the protrusion forming recess enters the inside of the through-type vent hole.
- the through-type vent hole has a larger volume than the non-through-type vent hole, so that it is possible to stop the entering rubber inside the through-type vent hole and enter the through-type vent hole. It is possible to suppress the rubber from protruding out of the mold.
- the rubber that has entered the through-type vent hole becomes a spew after vulcanization, but the spew remains inside the through-type vent hole, so that it can be removed from the through-type vent hole without cutting the spew.
- the through-type vent hole is thicker from the projection-forming recess to the outer surface of the mold than the non-through-type vent hole. It is formed in the part.
- the through-type vent hole is formed in a thick part of the mold thickness from the protrusion forming recess to the outer surface of the mold as compared with the non-through-type vent hole.
- the length of the mold-type vent hole can be easily made longer than the length of the non-through-type vent hole, whereby the volume of the through-type vent hole can be increased.
- the protrusion-forming recess is provided in a portion of the surface forming portion that forms a tire side portion, and the tire Turbulence generating protrusions that generate turbulent flow during rotation are formed.
- the protrusion forming recess is provided in the portion of the surface forming portion that forms the tire side portion, turbulence is generated during tire rotation to cool the tire.
- a turbulent flow generation projection capable of performing the above can be formed on the side portion of the tire.
- a tire molding die according to a fourth aspect is the tire molding die according to any one of the first to third aspects, wherein the depths of the non-penetrating vent hole and the penetrating vent hole are as follows. The direction coincides with the moving direction of the mold.
- the spew formed by the non-penetrating vent hole and the penetrating vent hole is replaced with the non-penetrating vent hole and the penetrating vent hole. Since it moves in the depth direction, the spew can be smoothly taken out from the non-penetrating vent hole and the penetrating vent hole.
- the tire manufacturing method includes a step of loading a raw tire inside the tire molding die according to any one of the first to fourth aspects, and loading into the tire molding die. Expanding the raw tire with a bladder, pressing the surface of the raw tire against the surface forming portion, and allowing unvulcanized rubber constituting the raw tire to enter the protrusion forming recess; and Heating and vulcanizing the green tire.
- the step of loading the raw tire inside the tire molding mold according to any one of the first to fourth aspects the tire molding mold
- the raw tire is inflated with a bladder, the surface of the raw tire is pressed against the surface forming portion, and the unvulcanized rubber constituting the raw tire is allowed to enter the protrusion forming recess, so that the first aspect It is possible to obtain the action described in 1.
- the tire molding die according to the first aspect when removing the vulcanized tire, it can be easily removed without cutting the spew, and the tire outer surface is sticky. By suppressing, stickiness of the surface forming portion can be suppressed, so that it has an excellent effect that the labor of cleaning the mold can be saved.
- the through-type vent hole is formed in the thick part of the mold thickness from the projection forming concave portion to the outer surface of the mold as compared with the non-through-type vent hole.
- the turbulent flow generation protrusion can be easily formed on the side portion of the tire.
- the tire molding die according to the fourth aspect it can be smoothly and smoothly taken out from the through-type vent hole and the non-through-type vent hole.
- the tire manufacturing method of the fifth aspect when removing the vulcanized tire, it can be easily removed without cutting the spew, and surface formation can be suppressed by suppressing the occurrence of stickiness on the outer surface of the tire. Since the stickiness of the part is also suppressed, it has an excellent effect that the labor of cleaning the mold can be saved.
- FIG. 1 is a perspective view, partly in section, showing a pneumatic tire molded using a tire molding die according to an embodiment of the present invention. It is a longitudinal cross-sectional view along the axis which shows the metal mold
- FIG. 3B is a cross-sectional view taken along line 3B-3B in FIG. 3A. It is an enlarged view of the periphery of the protrusion forming recess showing a state where unvulcanized rubber has entered the protrusion forming recess.
- FIG. 1 is a perspective view, partly in section, showing a pneumatic tire molded using a tire molding die according to an embodiment of the present invention. It is a longitudinal cross-sectional view along the axis which shows the metal mold
- FIG. 4B is a sectional view taken along line 4B-4B of FIG. 4A.
- FIG. 6 is an enlarged view of the periphery of the protrusion forming recess showing a state in which the unvulcanized rubber is completely filled in the protrusion forming recess.
- FIG. 5B is a sectional view taken along line 5B-5B in FIG. 5A. It is sectional drawing which shows the vent hole formed in the metal mold
- a tire molding die 10 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. (Composition of pneumatic tire) First, the configuration of a pneumatic tire 12 manufactured by the tire molding die 10 according to the present embodiment will be described with reference to FIG.
- a pneumatic tire 12 of a vulcanized product shown in FIG. 1 includes a bead core 16 embedded in a bead portion 14, a carcass 18 including at least one carcass ply that winds up the bead core 16 from the tire inner side to the outer side, a carcass A belt 20 composed of at least one belt ply disposed on the outer side in the tire radial direction of the tire 18, a side rubber layer 24 disposed on the outer side in the tire width direction of the carcass 18 and forming the bead portion 14 and the sidewall portion 22, and the belt 20 It is a thing of the general structure provided with the tread rubber layer 28 which is arrange
- a turbulent flow generation projection 30 is provided for generating turbulent flow during running to cool the bead portion 14.
- the turbulent flow generation projection 30 of the present embodiment has a substantially rectangular parallelepiped shape and is elongated in the tire radial direction when viewed from the side of the tire.
- the width dimension W of the turbulent flow generation protrusion 30 is 5 mm
- the length (dimension in the tire radial direction) of the turbulent flow generation protrusion 30 is 20 mm.
- interval, and a number it can set suitably according to the kind and application of a tire.
- three turbulent flow generation projections 30 that are arranged alternately in the tire radial direction form a set, and the set turbulent flow generation projections 30 are spaced from each other in the tire circumferential direction to form a surface of the bead portion 14. Is arranged.
- FIG. 2 is a cross-sectional view in the tire width direction of the tire molding die 10 in a state where the sector mold 32, the pair of upper and lower side molds 34, and the pair of ring molds 38 are combined with each other.
- the unvulcanized raw tire 12A is accommodated in a space (referred to as a vulcanization space) formed between the sector mold 32, the pair of upper and lower side molds 34, the bladder 40, and the pair of upper and lower side molds 34.
- the sector mold 32 has a tread pattern forming surface 32A on which irregularities (not shown) for forming a tread pattern are formed.
- the side mold 34 includes a sidewall forming surface 34 ⁇ / b> A that molds the sidewall portion 22.
- the ring mold 38 includes a bead portion forming surface 38 ⁇ / b> A for shaping the bead portion 14.
- the sector mold 32 can be moved in the tire radial direction (arrow R direction) by a moving mechanism (not shown), and the side mold 34 and the ring mold 38 can be moved in the tire width direction (arrow A direction) by a moving mechanism (not shown). Has been.
- the heated and pressurized fluid is blown into the bladder 40, so that the bladder 40 expands inside the unvulcanized raw tire 12A, and the unvulcanized raw tire 12A is expanded by the expanded bladder 40.
- the tread pattern forming surface 32A of the sector mold 32, the sidewall forming surface 34A of the side mold 34, and the bead portion forming surface 38A of the ring mold 38 are pressed and molded.
- the bead portion forming surface 38 ⁇ / b> A includes a protrusion forming recess 42 for forming the turbulent flow generation protrusion 30.
- the protrusion forming recess 42 is a recess that is recessed from the bead portion forming surface 38A toward the outer surface 38B.
- the diameter of the ring mold 38 at the bottom 42A of the projection forming recess 42 is shown.
- a non-penetrating vent hole 44 extending toward the outer surface 38B on the outer side in the tire width direction and terminating in the ring mold and substantially perpendicular to the bottom 42A is formed in the vicinity of the inner end in the direction of the ring.
- a penetrating vent hole 46 that extends toward the outer surface 38B and communicates with the outer surface 38B and that is substantially perpendicular to the bottom 42A is formed in the vicinity of the radially outer end of the mold 38.
- the penetrating vent hole 46 is formed and is not penetrating.
- the mold vent hole 44 may take a form that is not formed.
- the non-penetrating vent hole 44 is formed in a part of the ring mold 38 where the distance from the projection forming recess 42 to the outer surface 38B is relatively short, and the penetrating vent hole 46 is formed in the ring mold 38. 42 is formed in a portion where the distance from the outer surface 38B is relatively long (a portion where the distance from the outer surface 38B is longer than the position where the non-penetrating vent hole 44 is formed). The length is set longer than the length of the non-penetrating vent hole 44.
- the cross-sectional shape perpendicular to the longitudinal direction of the non-penetrating vent hole 44 is circular, and the cross-sectional shape perpendicular to the longitudinal direction of the penetrating vent hole 46 is also circular.
- the diameter d2 of the non-penetrating vent hole 44 and the diameter d1 of the penetrating vent hole 46 are set to the same diameter, but may be different.
- the maximum diameter of the diameter dimension d2 of the non-through-type vent hole 44 and the diameter dimension d1 of the through-type vent hole 46 is preferably set to be equal to or less than the width dimension (dimension in the tire circumferential direction) W of the protrusion forming recess 42.
- the minimum diameter is preferably 0.5 mm or more, more preferably 0.9 mm or more in consideration of workability.
- the through-type vent hole 46 has a function of discharging air in the mold, if it is less than 0.5 mm, the resistance is large and it is difficult to discharge air. Note that the non-penetrating vent hole 44 and the penetrating vent hole 46 can be formed not only by drilling but also by electric discharge machining or the like.
- the non-penetrating vent hole 44 is an area of 25% of the length L of the bottom 42A from the end 42E1 of the bottom 42A. It is preferable to form inside.
- the through-type vent hole 46 is preferably formed in an area of 25% of the length L of the bottom 42A from the end 42E2 of the bottom 42A.
- the air in the projection forming recess 42 is gradually discharged to the outside through the through-type vent hole 46, and the unvulcanized side rubber 24A further It enters toward the corner of the protrusion forming recess 42.
- most of the air in the projection forming recess 42 is discharged to the outside through the through-type vent hole 46, and as shown in FIG. 5A and FIG. A part of the sulfur side rubber 24 ⁇ / b> A enters the non-penetrating vent hole 44 and the penetrating vent hole 46.
- the penetrating vent hole 46 in which the air pushed by the unvulcanized rubber is disposed close to the corner is provided. Therefore, the unvulcanized rubber is filled in the corner of the projection forming recess 42 on the side where the through-type vent hole 46 is formed without causing air accumulation.
- a small amount of air that has not been discharged to the outside through the penetrating vent hole 46 may remain at the corner portion of the protrusion forming recess 42 where the non-penetrating vent hole 44 is formed.
- the remaining minute amount of air is pushed by the unvulcanized rubber entering the inside of the projection forming recess 42 and enters the non-penetrating vent hole 44 disposed close to the corner. For this reason, the unvulcanized rubber is filled in the corner of the projection forming recess 42 on the side where the non-penetrating vent hole 44 is formed without causing air accumulation.
- the unvulcanized rubber is heated and vulcanized by a tire molding die 10 heated as before, and a product pneumatic tire 12 is completed.
- a tire molding die 10 As described above, if the tire molding die 10 according to the present embodiment is used, no air pockets are formed in the corners of the projection forming recess 42 during vulcanization, and the unvulcanized side rubber 24A is used as the projection forming recess. Since 42 is filled to every corner, no depression (bear) is formed on the surface of the turbulent flow generation projection 30 of the pneumatic tire 12 after vulcanization molding.
- the spew protrudes from the turbulent flow generation projection 30. This spew is cut as usual. Removed by grinding, etc.
- the penetrating vent hole 46 is formed in a portion where the distance from the protrusion forming recess 42 to the outer surface 38B of the ring mold 38 is long, and the entire length is set long. For this reason, even if the unvulcanized side rubber 24A pressed by the bladder 40 enters the through-type vent hole 46, the tip of the entered unvulcanized side rubber 24A does not reach the outer surface 38B of the ring mold 38, It remains in the middle portion in the longitudinal direction of the through-type vent hole 46. Therefore, when the pneumatic tire 12 is taken out after vulcanization, the spew can be easily pulled out from the through-type vent hole 46 without being cut. Therefore, it is possible to save the trouble of cleaning work to remove the spew clogged in the hole.
- the amount of air remaining at the corner on the side where the non-through-type vent hole 44 is formed is a very small amount, which is a capacity of about 0.3% of the volume of the protrusion forming recess 42. For this reason, a small amount of air that cannot be exhausted by the through-type vent hole 46 and remains in the corner is prevented from passing through the non-through type so as not to cause air accumulation in the corner on the side where the non-through type vent hole 44 is formed.
- the volume of the non-penetrating vent hole 44 is preferably set to 0.3% or more, and is preferably set to 0.5% or more in consideration of variation in the air amount.
- the length of the non-penetrating vent hole 44 may be a length that does not penetrate the ring mold 38.
- the diameter d1 (see FIG. 3A) of the through-type vent hole 46 is larger than the width W of the protrusion-forming recess 42, the spew formed by the through-type vent hole 46 becomes too thick and the appearance quality is deteriorated. Further, since the rigidity of the spew is increased, it is difficult to remove the spew.
- the width dimension W of the protrusion forming recess 42 is 5 mm, the upper limit value of the diameter dimension d1 of the through-type vent hole 46 only needs to be suppressed to 5 mm or less, for example, about 4.5 mm. .
- the diameter d2 of the non-through vent hole 44 is preferably set similarly to the diameter d1 of the through vent hole 46.
- the diameter d1 of the through-type vent hole 46 becomes too thin, the ability to discharge air in the protrusion forming recess 42 is reduced (insufficient) and the protrusion cannot be formed sufficiently. Further, due to a decrease in spew rigidity and a large pipe resistance, the rubber (spew) formed in the through-type vent hole 46 is cut when the tire is molded from the tire molding die 10, and the rubber remains in the through-type vent hole 46. End up. If the diameter dimension d1 of the through-type vent hole 46 becomes too large, the pipe resistance becomes small and rubber easily enters the through-type vent hole 46, so that the length of the through-type vent hole 46 needs to be increased. Increases in size. For this reason, in order not to increase the size of the entire mold, the diameter of the through-type vent hole 46 is preferably set so that the tip of the unvulcanized side rubber 24A that has entered enters the inside of the through-type vent hole 46.
- non-through vent hole 44 volume (minimum value) is important for the sticking suppression effect of the turbulent flow generation projection 30 and is affected by the diameter d2 and the length of the non-through vent hole 44. There is nothing.
- vent hole formed in the portion where the distance from the projection forming recess 42 to the outer surface 38B of the ring mold 38 is short is A
- vent hole formed in a portion where the distance from the recess 42 to the outer side surface 38B of the ring mold 38 is long was designated as B.
- the length of the vent hole was adjusted in order to adjust the ratio of the volume of the non-penetrating vent hole to the turbulent flow generation protrusion (protrusion forming recess).
- the rubber filling rate of the turbulent flow generation protrusion As an evaluation method, after vulcanizing and molding a pneumatic tire, the rubber filling rate of the turbulent flow generation protrusion, the clogging of the mold rubber, and the occurrence of sticky rubber (with stickiness) on the surface of the turbulent flow generation protrusion The presence or absence was compared. In this test, the rubber filling rate of the turbulent flow generation projections is 100% (no bears are generated), there is no adhesion of the rubber on the mold, and there is no clogging. When no occurrence occurred, the determination was OK. In addition, when any of these is present, the determination is NG.
- a through-type vent hole is formed in a portion where the distance from the protrusion forming recess to the outer surface of the mold is long, and the distance from the protrusion forming recess to the outer surface of the mold is not long.
- Pneumatic tires manufactured using tire molding dies (Test Examples 6, 8, 9, and 10) in which through-type vent holes are formed have a turbulent flow projection filling rate of 100% (that is, bare There is no adhesion of rubber and clogging of the mold, and there is no sticky rubber (sticky) on the surface of the turbulent flow generation projection after vulcanization molding, and the effect of the present invention is achieved. Proven.
- the upper limit of the volume of the non-penetrating vent hole is not particularly limited.
- the diameter of the non-penetrating vent hole 44 of the above-described embodiment is constant over the entire length, but the diameter may be reduced toward the tip as shown in FIG.
- non-penetrating vent hole 44 and the penetrating vent hole 46 of the above-described embodiment have a circular cross-sectional shape perpendicular to the longitudinal direction, but the present invention is not limited to this and is shown in FIG. Thus, other shapes other than a circle, such as a quadrangle, may be used.
- one non-penetrating vent hole 44 and one penetrating vent hole 46 are provided for each of the protrusion forming recesses 42, but the non-penetrating vent hole is selected according to the size of the protrusion forming recess 42. 44 and the number of penetrating vent holes 46 may be increased.
- the non-penetrating vent hole 44 and the penetrating vent hole 46 are formed in the projection forming recess 42 for forming the turbulent flow generating projection 30 of the bead portion 14. If it is a recessed part for forming the protrusion formed in an outer surface, it can be formed in all the recessed parts of a mold. For example, it can also be formed in a recess for forming a tread block or rib. Thereby, generation
- the non-penetrating vent hole 44 and the penetrating vent hole 46 are substantially perpendicular to the bottom 42A of the projection forming recess 42, and the side mold 34 and the ring mold 38 are inclined with respect to the moving direction (tire width direction, arrow A direction).
- a through-type vent hole 46 is formed in parallel to the movement direction (arrow A direction) of the side mold 34 and the ring mold 38.
- the moving direction of the non-penetrating vent hole 44 and the penetrating vent hole 46 and the length of the spew formed by the non-penetrating vent hole 44 and the penetrating vent hole 46 Since the directions coincide with each other, the spew formed by the non-penetrating vent hole 44 and the penetrating vent hole 46 can be smoothly taken out from the non-penetrating vent hole 44 and the penetrating vent hole 46.
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Abstract
Description
特開2012―029377号公報のタイヤ成型用金型では、加硫時に、突起を形成するための金型の窪み状の突起形成用凹部に生ずる空気溜まりの発生を抑制するため、突起形成用凹部の空気を入り込ませる凹状の非貫通型ベントホールを突起形成用凹部に設けている。
また、従来、一般的に用いられているタイヤ成型用金型では、金型内の空気溜まりの発生を抑制するため、金型内の空気を金型外部へ排出する貫通型ベントホールを複数設けている。
一方、非貫通型ベントホールのみを設けたタイヤ成型用金型では、タイヤ加硫後、スピューの先端がベト付く現象が起き、加硫済みのタイヤ表面がベト付いたり、また、ベト付いたゴムがモールド表面に残る場合があり、改善の余地があった。
発明者が、非貫通型ベントホールのみを設けたタイヤ成型用金型でタイヤを加硫成型した際に、突起に形成されたスピューの先端がベト付く原因を種々調査検討した結果、非貫通型ベントホールの内部に残った空気の量が多い場合に、空気と接触している部分がゴムの加硫後においてもベト付くことが分かった。
前記生タイヤを加熱加硫する工程と、を有する。
(空気入りタイヤの構成)
先ず、図1にしたがって、本実施形態に係るタイヤ成型用金型10によって製造される空気入りタイヤ12の構成について説明する。
一例として、乱流発生用突起30の幅寸法Wは5mmであり、乱流発生用突起30の長さ(タイヤ径方向寸法)は、20mmである。なお、乱流発生用突起30の寸法、間隔、数については、タイヤの種類、用途に応じて適宜設定することができる。
本実施形態では、タイヤ径方向に互い違いに配置した乱流発生用突起30を3個で一セットとして、セットとした乱流発生用突起30をタイヤ周方向に間隔を開けてビード部14の表面に配置している。
空気入りタイヤ12を加硫成型するための本実施形態に係るタイヤ成型用金型10を図2にしたがって説明する。図2は、セクターモールド32、上下一対のサイドモールド34、及び一対のリングモールド38とが互いに組み合わされた状態におけるタイヤ成型用金型10のタイヤ幅方向の断面図である。
セクターモールド32は、図示しない移動機構によってタイヤ径方向(矢印R方向)に移動可能とされ、サイドモールド34、及びリングモールド38は図示しない移動機構によってタイヤ幅方向(矢印A方向)に移動可能とされている。
なお、非貫通型ベントホール44、及び貫通型ベントホール46は、ドリル加工に限らず、放電加工等により形成することもできる。
図2に示すように、タイヤ成型用金型10の内部に未加硫の生タイヤ12Aを装填してブラダー40を膨張させると、タイヤ外面がモールド内面に押圧され、図4A及び図4Bに示すように、未加硫のサイドゴム24Aが突起形成用凹部42に入り込む。この時点では、底部42Aの周囲に空気が通過できる隙間Sがある。
なお、非貫通型ベントホール44の端部には、貫通型ベントホール46を介して外部へ排出されなかった微量の空気(例えば、突起形成用凹部42の容積の0.3%程度)が残る。
以上の様に、本実施形態のタイヤ成型用金型10を用いれば、加硫時に突起形成用凹部42の隅部に空気溜まりが生ずることは無く、未加硫のサイドゴム24Aが突起形成用凹部42の隅々まで充填されるので、加硫成形後の空気入りタイヤ12の乱流発生用突起30の表面に窪み(ベア)が形成されることは無い。
実施形態の効果を確かめるために、ベントホールの種類を変えた複数のタイヤ成型用金型(試験例1~10)を用いて加硫成型した空気入りタイヤの比較を行った。以下、表1、2において評価結果を示す。タイヤ成型用金型の構造は、前述した実施形態のタイヤ成型用金型10の構造と同じものである。
以上、本発明の一実施形態について説明したが、本発明は、上記に限定されるものでなく、上記以外にも、その主旨を逸脱しない範囲内において種々変形して実施可能であることは勿論である。
本明細書に記載されたすべての文献、特許出願、及び技術規格は、個々の文献、特許出願、及び技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
Claims (5)
- 生タイヤの表面に接触してタイヤ外面の型付けを行う表面形成部を備えたモールドと、
前記モールドに設けられ、タイヤ外面に突起を形成するための凹状の突起形成用凹部と、
一端部が前記突起形成用凹部に連通し、他端部がモールド内で終端する非貫通型ベントホールと、
前記モールドに設けられ、前記非貫通型ベントホールよりも容積が大きく設定され、一端が前記突起形成用凹部と連通し他端がモールド外部と連通する貫通型ベントホールと、
を備えたタイヤ成型用金型。 - 前記貫通型ベントホールは、前記非貫通型ベントホールよりも、前記突起形成用凹部からモールド外面までのモールド厚さの厚い部分に形成されている、請求項1に記載のタイヤ成型用金型。
- 前記突起形成用凹部は、前記表面形成部のうち、タイヤ側部を形成する部分に設けられ、タイヤ回転時に乱流を発生させる乱流発生突起を形成する、請求項1または請求項2に記載のタイヤ成型用金型。
- 前記非貫通型ベントホール、及び前記貫通型ベントホールの深さ方向は、前記モールドの移動方向と一致している、請求項1~請求項3の何れか1項に記載のタイヤ成型用金型。
- 請求項1~請求項4の何れか1項に記載のタイヤ成型用金型の内部に生タイヤを装填する工程と、
前記タイヤ成型用金型に装填された前記生タイヤをブラダーで膨張させ、前記生タイヤの表面を前記表面形成部に押圧させると共に、前記生タイヤを構成する未加硫のゴムを前記突起形成用凹部に進入させる工程と、
前記生タイヤを加熱加硫する工程と、
を有するタイヤの製造方法。
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EP15759324.5A EP3115169B1 (en) | 2014-03-07 | 2015-03-05 | Tire mold and method for producing a tire |
US15/123,344 US10081145B2 (en) | 2014-03-07 | 2015-03-05 | Tire forming-mold and tire manufacturing method |
JP2016506561A JP6495239B2 (ja) | 2014-03-07 | 2015-03-05 | タイヤ成型用金型、及びタイヤの製造方法 |
CN201580012605.5A CN106103029B (zh) | 2014-03-07 | 2015-03-05 | 轮胎成型用模具和轮胎的制造方法 |
ES15759324.5T ES2657749T3 (es) | 2014-03-07 | 2015-03-05 | Molde de neumático y método de fabricación de un neumático |
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US4812281A (en) * | 1987-12-14 | 1989-03-14 | The Goodyear Tire & Rubber Company | Pressurization of tire mold vents |
JPH0724835A (ja) * | 1993-07-14 | 1995-01-27 | Sumitomo Rubber Ind Ltd | タイヤ加硫成形用ブラダーおよびそれを製造するための金型 |
JP2010012666A (ja) * | 2008-07-02 | 2010-01-21 | Yokohama Rubber Co Ltd:The | タイヤ成形用金型及びこれにより成形された空気入りタイヤ |
WO2011142342A1 (ja) * | 2010-05-10 | 2011-11-17 | 株式会社ブリヂストン | タイヤ製造用金型 |
JP2013060181A (ja) * | 2011-09-15 | 2013-04-04 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ及びその製造方法 |
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JPS5146787B1 (ja) * | 1964-06-26 | 1976-12-10 | ||
CN1042116C (zh) | 1992-10-12 | 1999-02-17 | 株式会社锦湖 | 带多孔材料透气元件的轮胎成型模 |
JP5473071B2 (ja) | 2010-07-20 | 2014-04-16 | 本田技研工業株式会社 | 負荷制御装置 |
JP2012040769A (ja) * | 2010-08-19 | 2012-03-01 | Bridgestone Corp | タイヤ成型用金型 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US4812281A (en) * | 1987-12-14 | 1989-03-14 | The Goodyear Tire & Rubber Company | Pressurization of tire mold vents |
JPH0724835A (ja) * | 1993-07-14 | 1995-01-27 | Sumitomo Rubber Ind Ltd | タイヤ加硫成形用ブラダーおよびそれを製造するための金型 |
JP2010012666A (ja) * | 2008-07-02 | 2010-01-21 | Yokohama Rubber Co Ltd:The | タイヤ成形用金型及びこれにより成形された空気入りタイヤ |
WO2011142342A1 (ja) * | 2010-05-10 | 2011-11-17 | 株式会社ブリヂストン | タイヤ製造用金型 |
JP2013060181A (ja) * | 2011-09-15 | 2013-04-04 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ及びその製造方法 |
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CN106103029B (zh) | 2018-01-02 |
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EP3115169B1 (en) | 2018-01-03 |
CN106103029A (zh) | 2016-11-09 |
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US10081145B2 (en) | 2018-09-25 |
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