JP2009006514A - Method for manufacturing pneumatic radial tire - Google Patents

Method for manufacturing pneumatic radial tire Download PDF

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JP2009006514A
JP2009006514A JP2007167929A JP2007167929A JP2009006514A JP 2009006514 A JP2009006514 A JP 2009006514A JP 2007167929 A JP2007167929 A JP 2007167929A JP 2007167929 A JP2007167929 A JP 2007167929A JP 2009006514 A JP2009006514 A JP 2009006514A
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tire
rigid core
mold
raw
vulcanization
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Kazuhiko Yamaki
一彦 八巻
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a pneumatic radial tire capable of effectively preventing rubber biting, squeeze-out or the like of a green tire onto the mating face of a mold for vulcanization from occurring without generating floating-up or the like of a ply cord on the inner surface of a product tire. <P>SOLUTION: A plurality of non-extensive ply cords 2 are arranged on a doughnut-shaped rigid core 1 which can be disassembled and assembled at specified intervals in the peripheral direction under a condition that they are inclined at a specified angle θ to a line segment r in the radial direction of the rigid core 1 to form at least one sheet of carcass ply raw material 4. Required tire constitutional members are laminated in a specified order to mold a green tire which has a smaller diameter than a product tire, and whose tread part forming part of the product tire is narrower in width than the tread part of the product tire. This green tire with the rigid core 1 is inserted into the mold for vulcanization, and under a mold closing condition of the mold for vulcanization, the green tire is expanded and deformed to extrude it onto a molding face of the mold for vulcanization to vulcanize and mold the green tire. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、分解および組立てが可能な剛性コア上で生タイヤを成型することを前提とする空気入りラジアルタイヤの製造方法に関するものであり、とくには加硫モールドの型閉めに際する、生タイヤのゴム噛み、はみ出し等を有効に防止し得る技術を提案するものである。   The present invention relates to a method for manufacturing a pneumatic radial tire on the premise that a green tire is molded on a rigid core that can be disassembled and assembled, and in particular, a green tire for closing a mold of a vulcanization mold The present invention proposes a technique that can effectively prevent rubber biting, protrusion, and the like.

近年は、製品タイヤの各種の精度を高めるべく、生タイヤの成型に当って、製品タイヤの内面形状と対応する外面形状を有する、分解および組立てが可能なドーナツ状の剛性コア上で、製品タイヤのゴム体積等とほぼ等しいゴム体積等を有する生タイヤを成型することが提案されており、この場合、剛性コアの半径方向に延在させたプライコードによってカーカスプライ素材を形成することで、プライコードの延在姿勢を、製品タイヤ内でのプライコードの延在姿勢と同一とし、また、生タイヤの寸度を、製品タイヤのそれとほぼ等しくしている。   In recent years, in order to increase the accuracy of various types of product tires, a product tire is formed on a doughnut-shaped rigid core that has an outer surface shape corresponding to the inner shape of the product tire and that can be disassembled and assembled. It has been proposed to form a green tire having a rubber volume approximately equal to the rubber volume of the rubber. In this case, a ply cord extending in the radial direction of the rigid core is used to form a ply cord material. The extended posture of the cord is the same as the extended posture of the ply cord in the product tire, and the size of the raw tire is almost equal to that of the product tire.

これがため、生タイヤの外形寸法等と、製品タイヤの外形寸法等が極く近似することになり、たとえば、剛性コア上の生タイヤを、その剛性コアとともに、加硫モールド内に装入して、それに加硫成形を施す場合の加硫モールドの型閉めに当り、図4に跨張して例示するように、それぞれのサイドモールドS1,S2と、トレッドセクタモールドSEとの整合面間および、トレッドセクタモールドSE相互の整合面間に、図にドットを施して示すように、剛性コアC上の生タイヤGTのゴム噛み、はみ出し等が発生し易いという問題があった。   For this reason, the outer dimensions of the raw tire and the outer dimensions of the product tire are very close. For example, the raw tire on the rigid core is inserted into the vulcanization mold together with the rigid core. When closing the mold of the vulcanization mold when performing vulcanization molding, as shown in FIG. 4, the alignment between the side surfaces S1 and S2 and the alignment surfaces of the tread sector mold SE and There is a problem that the raw tire GT on the rigid core C is likely to be caught or protruded between the alignment surfaces of the tread sector molds SE as shown in the drawing.

このような問題点に対しては、生タイヤを、型閉めされた加硫モールドの成形面の輪郭形状より小さく成型して、生タイヤの加硫成形に当って、その生タイヤを、加硫モールドの成形面に密着するまで拡張変形させることが考えられるが、このことによれば、生タイヤの、ラジアル構造になるカーカスプライ素材のプライコードの長さが不足することになって、プライコードの引き抜けのおそれが生じる他、プライコードが製品タイヤの内表面に浮き出すことになる、プライペネトレーションと称される欠陥が生じることになる。   To solve this problem, the raw tire is molded to be smaller than the contour shape of the molding surface of the closed vulcanization mold, and the raw tire is vulcanized when the raw tire is vulcanized. It is possible to expand and deform until it comes into close contact with the molding surface of the mold, but according to this, the length of the ply cord of the carcass ply material that becomes a radial structure of the raw tire is insufficient, In addition to the possibility of pulling out, a defect called ply penetration occurs in which the ply cord is raised on the inner surface of the product tire.

そこでこの発明は、プライコードの引き抜けのおそれ、製品タイヤの内表面へのプライコードの浮き出し等を生じさせることなく、加硫モールドの合せ面への生タイヤのゴム噛み、はみ出し等を有効に防止できる空気入りラジアルタイヤの製造方法を提供する。   Accordingly, the present invention effectively prevents the rubber tire from biting into or protruding from the mating surface of the vulcanization mold without causing the ply cord to be pulled out or causing the ply cord to be lifted to the inner surface of the product tire. A method for manufacturing a pneumatic radial tire that can be prevented is provided.

この発明に係る空気入りラジアルタイヤの製造方法は、分解および組立てが可能なドーナツ状の剛性コア上に、スチールコード、芳香族ポリアミド繊維コード等の非伸長性の、一本ずつもしくは複数本ずつのプライコードを、その剛性コアの半径方向線分に対して所定角度傾けた状態で、周方向に所定の間隔をおいて複数配設して一枚以上のカーカスプライ素材を形成するとともに、所要のタイヤ構成部材を所定の順序で積層して、製品タイヤ、いいかえれば、型閉めされた加硫モールドの内径より小径で、製品タイヤのトレッド部形成部分が、製品タイヤのトレッド部、これもいいかえれば、型閉めされた加硫モールドの、両サイドモードルとトレッドモールドとの合わせ面間隔より狭幅の生タイヤを成型し、この生タイヤを、剛性コアとともに加硫モールド内へ装入して、加硫モールドの型閉め状態で、その生タイヤを拡張変形させて加硫モールドの成形面に押圧して生タイヤを加硫成形するにある。   The method for manufacturing a pneumatic radial tire according to the present invention includes a doughnut-shaped rigid core that can be disassembled and assembled, and a non-extensible, one-by-one or a plurality of non-extendable steel cords, aromatic polyamide fiber cords, etc. A plurality of ply cords are disposed at a predetermined interval in the circumferential direction in a state where the ply cord is inclined at a predetermined angle with respect to the radial line segment of the rigid core to form one or more carcass ply materials, and The tire components are laminated in a predetermined order, and the product tire, in other words, the inner diameter of the closed vulcanization mold is smaller than the inner diameter of the product tire, and the tread portion forming portion of the product tire is the tread portion of the product tire. The molded vulcanized mold was molded into a raw tire having a width narrower than the interval between the mating surfaces of both side modalles and the tread mold. Was charged even into vulcanization mold within a mold closing state of the vulcanization mold is pressing into raw tire forming surface of the vulcanization mold to expand deforming the green tire to vulcanization molding.

この場合好ましくは、加硫モールドの型閉めの後、生タイヤの拡張変形に先だって、その生タイヤのインナーライナ素材を、加熱した剛性コアの周面に一旦押圧して、そのインアーライナ素材を半加硫状態とする。
なお、インナーライナ素材の、剛性コアの周面へのこの押圧は、加硫モールド内への加圧気体、たとえば加圧空気の吹き込みによって行わせることが好ましい。
In this case, preferably, after closing the mold of the vulcanization mold, the inner liner material of the raw tire is once pressed against the peripheral surface of the heated rigid core before the raw tire is expanded and deformed, and the inner liner material is half-added. Sulfur state.
The pressing of the inner liner material to the peripheral surface of the rigid core is preferably performed by blowing pressurized gas, for example, pressurized air, into the vulcanization mold.

この一方で、生タイヤの拡張変形は、剛性コアと生タイヤとの間への、高温加圧気体、たとえば加圧蒸気の吹き込みによって行わせることが好ましい。   On the other hand, the expansion deformation of the raw tire is preferably performed by blowing high-temperature pressurized gas, for example, pressurized steam, between the rigid core and the raw tire.

そしてまた好ましくは、生タイヤの拡張変形に伴って、各プライコート゛を、剛性コアの半径方向に向く延在姿勢とする。   Preferably, each ply coat is extended in the radial direction of the rigid core as the raw tire is expanded and deformed.

この発明に係る、空気入りラジアルタイヤの他の製造方法は、分解および組立てが可能な、大小複数種類のセグメントからなるドーナツ状の剛性コア上に、有機もしくは無機材料からなる非伸長性の、一本ずつもしくは複数本ずつのプライコードを、その剛性コアの半径方向線分に対して所定角度傾けた状態で、周方向に所定の間隔をおいて複数配設して、一枚以上のカーカスプライ素材を形成するとともに、所要のタイヤ構成部材を所定の順序で積層して、製品タイヤより小径で、製品タイヤのトレッド部形成部分が、製品タイヤのトレッド部より狭幅の生タイヤを成型し、この生タイヤを、剛性コアから取り外した状態で加硫モールド内へ装入して、加硫モールドの型閉めの状態で、その生タイヤを直接的に、または加硫ブラダを介して拡張変形させて加硫モールドの成形面に押出して生タイヤを加硫成形するにある。   Another method of manufacturing a pneumatic radial tire according to the present invention is a non-extensible one made of organic or inorganic material on a doughnut-shaped rigid core composed of a plurality of large and small segments that can be disassembled and assembled. One or more ply cords are arranged at predetermined intervals in the circumferential direction with one or more ply cords inclined at a predetermined angle with respect to the radial line segment of the rigid core. Forming the raw material and laminating required tire constituent members in a predetermined order, forming a raw tire having a smaller diameter than the product tire and a narrower width than the tread portion of the product tire, where the tread portion forming portion of the product tire is formed, The raw tire is inserted into the vulcanization mold in a state where it is removed from the rigid core, and the raw tire is directly or via a vulcanization bladder with the vulcanization mold closed. The green tire is extruded to the molding surface of the vulcanization mold by Zhang deformed in vulcanizing.

そしてこの場合、生タイヤの拡張変形は、生タイヤ内または加硫ブラダ内への高温加圧気体の供給によって行うこと、また、生タイヤの拡張変形によって、各プライコードを剛性コアの半径方向に延在させることが好ましい。   In this case, the expansion deformation of the green tire is performed by supplying high-temperature pressurized gas into the green tire or the vulcanizing bladder, and each ply cord is extended in the radial direction of the rigid core by the expansion deformation of the green tire. It is preferable to extend.

この発明に係る製造方法では、剛性コア上で生タイヤを成型することにより、ゴム体積その他についての成型精度を十分に確保することができ、この一方で、剛性コア上で成型された生タイヤの外径を、製品タイヤのそれより、たとえば2〜6%小径とするとともに、その生タイヤの、製品タイヤのトレッド部形成部分の幅を、製品タイヤのトレッド幅より、たとえば2〜6%狭幅とすることで、加硫モールドの型閉めに際する、その生タイヤの、サイドモールドとの間および、トレッドモールド相互間へのゴム噛み、はみ出し等の発生を有効に防止することができる。   In the manufacturing method according to the present invention, by molding the raw tire on the rigid core, it is possible to sufficiently ensure the molding accuracy of the rubber volume and the like. On the other hand, the raw tire molded on the rigid core The outer diameter is 2-6% smaller than that of the product tire, and the width of the tread portion forming portion of the raw tire is narrower by 2-6%, for example, than the tread width of the product tire. Thus, when the vulcanization mold is closed, it is possible to effectively prevent the occurrence of rubber biting and protrusion of the green tire between the side mold and between the tread molds.

そしてまたこの方法では、生タイヤを拡張変形させて、それを、型閉め加硫モールドの成形面に密着させるに当り、予め傾けて配設した各プライコードを、剛性コアの半径方向線分に近づく向きに変位させることにより、小さめに成型した生タイヤを、プライコードの引き抜け、製品タイヤの内表面へのプライコードの浮き出し等を生じさせることなしに、加硫モールドの成形面に確実に密着させることができ、これにより、所期した通りのトレッドパターン等が正確に付与された所定の製品タイヤとすることができる。   In this method, the raw tire is expanded and deformed, and when it is brought into close contact with the molding surface of the mold closing vulcanization mold, each ply cord disposed in advance is placed on the radial line segment of the rigid core. By displacing in the approaching direction, the raw tire molded in a small size can be securely applied to the molding surface of the vulcanization mold without causing the ply cord to pull out and the ply cord to rise to the inner surface of the product tire. It is possible to obtain a predetermined product tire to which a tread pattern or the like as expected is accurately given.

ここで、加硫モールドの型閉めの後、生タイヤの拡張変形に先だって、インナーライナ素材を半加硫状態とする場合は、その後に続く生タイヤの拡張変形に際し、架橋反応が進んで強度の増したそのインナーライナ素材をもってプライコードの延在姿勢をより円滑に変更させることができ、この結果として、生タイヤの拡張変形を、迅速かつ確実なものとすることができる。   Here, after closing the mold of the vulcanization mold, when the inner liner material is in a semi-vulcanized state prior to the expansion deformation of the raw tire, the cross-linking reaction proceeds and the strength is increased during the subsequent expansion deformation of the raw tire. With the increased inner liner material, the extension posture of the ply cord can be changed more smoothly. As a result, the expansion deformation of the raw tire can be made quick and reliable.

またここで、インナーライナ素材を、型閉めした加硫モールド内への加圧気体の吹き込みによって剛性コアの周面に押圧するときは、インナーライナ素材の全体を剛性コアの周面に均等に押圧してインナーライナ素材の加硫の進行度合を十分均質なものとすることができる。   Also, here, when the inner liner material is pressed against the peripheral surface of the rigid core by blowing pressurized gas into the closed vulcanization mold, the entire inner liner material is pressed evenly against the peripheral surface of the rigid core. Thus, the progress of vulcanization of the inner liner material can be made sufficiently uniform.

ところで、生タイヤの拡張変形を、たとえば、剛性コアに多数穿設した小孔を介してその剛性コアと生タイヤとの間の高温加圧気体の吹き込みによって行う場合は、生タイヤの加硫を、それが密着する加硫モールド側から進行させることに加え、加熱された剛性コアから離隔された生タイヤの内面側からの加硫を、その高温加圧気体をもって進行させることができる。   By the way, when the raw tire is expanded and deformed by, for example, blowing a high-temperature pressurized gas between the rigid core and the raw tire through a plurality of small holes formed in the rigid core, the raw tire is vulcanized. In addition to proceeding from the side of the vulcanization mold to which it adheres, vulcanization from the inner surface side of the green tire separated from the heated rigid core can proceed with the high-temperature pressurized gas.

そして、生タイヤのこのような拡張変形によって、各プライコードを剛性コアの半径方向に延在させる場合、いいかえれば、プライコードの初期の傾き角度を、生タイヤの事後的な所定の拡張変形量との関連の下で予め選択して、製品タイヤ内でプライコードを剛性コアの丁度半径方向に延在させる場合は、一枚以上のカーカスプライからなるカーカスを、正確なラジアル構造とすることができる。   Then, when each ply cord extends in the radial direction of the rigid core by such an expansion deformation of the raw tire, in other words, the initial inclination angle of the ply cord is determined as a predetermined amount of expansion deformation after the raw tire. When the ply cord is extended in the radial direction of the rigid core in the product tire in advance, the carcass composed of one or more carcass plies may have an accurate radial structure. it can.

この発明に係る他の製造方法では、剛性コア上で生タイヤを成型することによる利点はそのままに、予め小さめに成型したその生タイヤを剛性コアから取り外して加硫モールド内へ装入し、そしてその加硫モールドを型閉めすることで、前述したと同様に、生タイヤのゴム噛み、はみ出し等の発生のおそれを十分に取り除くことができる。   In another manufacturing method according to the present invention, while maintaining the advantage of molding the raw tire on the rigid core, the raw tire molded in advance is removed from the rigid core and inserted into the vulcanization mold, and By closing the vulcanization mold, it is possible to sufficiently eliminate the possibility of occurrence of rubber biting or protrusion of the raw tire, as described above.

またここでは、生タイヤを直接的に、または加硫ブラダを介して、プライコードの延在形態の変更下で拡張変形させて、生タイヤの外周面を加硫モールドの成形面に押出し、これにより、生タイヤを加硫モールド側から加硫することで、これもまた、プライコードの引き抜け、製品タイヤの内表面へのプライコードの浮き出し等なしに、所期した通りのトレッドパターンその他が正確に付与された所定のサイズの製品タイヤとすることができる。   Further, here, the raw tire is expanded or deformed directly or via a vulcanization bladder under a change in the extension form of the ply cord, and the outer peripheral surface of the raw tire is extruded onto the molding surface of the vulcanization mold. By vulcanizing the raw tire from the vulcanization mold side, the tread pattern as expected can also be obtained without pulling out the ply cord and lifting the ply cord to the inner surface of the product tire. It can be a product tire of a predetermined size that is accurately applied.

この場合、生タイヤの拡張変形を、生タイヤ内、または加硫ブラダ内への、水蒸気その他の高温加圧気体の供給によって行うときは、その高温加圧気体をもって、生タイヤの加硫を内面側からも進行させることができる。   In this case, when the raw tire is expanded and deformed by supplying steam or other high-temperature pressurized gas into the raw tire or vulcanizing bladder, the raw tire is vulcanized with the high-temperature pressurized gas. It can also be advanced from the side.

なおここで、生タイヤの所定の拡張変形によって各プライコードを剛性コアの半径方向に延在させる場合は、先にも述べたように、製品タイヤを正確にラジアル構造とすることができる。   Here, when each ply cord is extended in the radial direction of the rigid core by a predetermined expansion deformation of the raw tire, the product tire can be accurately formed in a radial structure as described above.

図1は、この発明に係る方法におけるカーカスプライ素材の形成例を示す図である。
ここでははじめに、分解および組立てが可能な、たとえば大小二種類のセグメントからなるドーナツ状の剛性コア1上に、図示しないインナーライナ素材その他の所要のタイヤ構成部材を配設した後、スチールコード、芳香族ポリアミド繊維コード、ガラスもしくは炭素繊維コード等の有機もしくは無機材料からなる非伸長性のプライコード2の一本ずつもしくは複数本ずつを、たとえば、剛性コア1に対して進退駆動される一対のクランパ3によって狭持し、そのプライコード2を、クランパ3の進退変位に基いて、剛性コア1の半径方向線分rに対して所定の角度θ傾けた状態で、剛性コア1の一方の側部から他方の側部にわたって貼付け、このことを、所定の角度ずつ割出し回動変位される剛性コア1に対して繰り返し行うことにより、プライコード2を、周方向に所定の間隔をおいて複数個所に配設して一枚以上のカーカスプライ素材4を形成する。
FIG. 1 is a diagram showing an example of forming a carcass ply material in the method according to the present invention.
Here, first, after disposing an inner liner material and other required tire components (not shown) on a doughnut-shaped rigid core 1 that can be disassembled and assembled, for example, composed of two types of large and small segments, a steel cord, aroma A pair of clampers that are driven forward or backward with respect to the rigid core 1, for example, one or more of the non-extensible ply cords 2 made of an organic or inorganic material such as a group polyamide fiber cord, glass or carbon fiber cord 3, and the ply cord 2 is inclined at a predetermined angle θ with respect to the radial line segment r of the rigid core 1 based on the forward / backward displacement of the clamper 3. Is applied over the other side, and this is repeated on the rigid core 1 that is indexed and displaced by a predetermined angle. The ply cord 2 in the circumferential direction at a predetermined interval and disposed at a plurality of forming one or more sheets of carcass plies material 4.

図1(b)は、カーカスプライ素材4のこの形成状態を例示する剛性コア1の断面斜視図であり、ここでは各プライコード2は、剛性コア1の半径方向断面に対して、角度θ傾いて延在する。
なお図中5は、剛性コア1の各側部で、それの内周側部分に配置した各ビードコアを示す。
FIG. 1B is a cross-sectional perspective view of the rigid core 1 exemplifying this formation state of the carcass ply material 4, where each ply cord 2 is inclined by an angle θ with respect to the radial cross section of the rigid core 1. Extend.
In the figure, reference numeral 5 denotes each bead core disposed on the inner peripheral side portion of each side of the rigid core 1.

次いで、ベルト素材、未加硫トレッドゴム、未加硫サイドウォールゴムその他のタイヤ構成部材を、剛性コア1上で、カーカスプライ素材4上に所定の順序で積層することで、製品タイヤより小径で、製品タイヤのトレッド部形成部分が、製品タイヤのトレッド部より狭幅となる生タイヤを成型する。   Next, a belt material, an unvulcanized tread rubber, an unvulcanized sidewall rubber and other tire constituent members are laminated in a predetermined order on the rigid core 1 and on the carcass ply material 4 so that the diameter is smaller than that of the product tire. A green tire is formed in which the tread portion forming portion of the product tire is narrower than the tread portion of the product tire.

その後は、生タイヤを剛性コア1とともに加硫モールド内へ装置し、続いて、その加硫モールドを、図2(a)に示すように型閉めする。
この場合、剛性コア1上の生タイヤ6は予め小さめに成型されていて、型閉め姿勢のトレッドセクタモールド7の内径寸法より、たとえば2〜6%小径であるとともに、上下のそれぞれのサイドモールド8,9と、トレッドセクタモールド7との合わせ面間隔より、これもたとえば2〜6%狭幅であるので、加硫モールド7,8,9の図示のような型閉めに当って、生タイヤ6がそれらの間に噛み込まれたり、それらの間からはみ出したりするおそれを十分に取り除くことができる。
Thereafter, the raw tire is installed in the vulcanization mold together with the rigid core 1, and then the vulcanization mold is closed as shown in FIG.
In this case, the raw tire 6 on the rigid core 1 is preliminarily molded to be smaller than the inner diameter of the tread sector mold 7 in the mold closing position, for example, by 2 to 6%, and each of the upper and lower side molds 8. , 9 and the tread sector mold 7, for example, are 2 to 6% narrower than the mating surface spacing, so that the raw tire 6 is used when the vulcanized molds 7, 8, 9 are closed as shown in the figure. Can be sufficiently removed from being caught between them or protruding from between them.

加硫モールドをこのように型閉めした後は、好ましくは、剛性コア1の加熱下で、図2(b)に例示するように、加硫モールド内へ加圧気体を吹き込み、これにより、生タイヤ6のインナーライナ素材10を、それの全体にわたって、剛性コア1の周面に均等に押圧して、そのインナーライナ素材10を、剛性コア1による加熱によって、全体的に均質な半加硫状態とする。   After the vulcanization mold is closed in this manner, preferably, under the heating of the rigid core 1, a pressurized gas is blown into the vulcanization mold as illustrated in FIG. The inner liner material 10 of the tire 6 is evenly pressed against the peripheral surface of the rigid core 1 over the entire surface, and the inner liner material 10 is heated by the rigid core 1 so as to be in a generally homogeneous semi-vulcanized state. And

しかる後は、好ましくは、図2(c)に示すように、剛性コア1と生タイヤ6との間へ高温加圧気体を吹き込むことによって、その生タイヤ6を拡張変形させて、それの外面を加硫モールドの成形面に密着させ、そこで、加硫モールドからの熱および、高温加圧気体の熱のそれぞれによって生タイヤ6を加硫する。   Thereafter, as shown in FIG. 2 (c), preferably, the raw tire 6 is expanded and deformed by blowing high-temperature pressurized gas between the rigid core 1 and the raw tire 6, so that the outer surface of the raw tire 6 is deformed. Is closely adhered to the molding surface of the vulcanization mold, and the raw tire 6 is vulcanized by heat from the vulcanization mold and heat of the high-temperature pressurized gas.

ところで、この場合の生タイヤ6の拡張変形は、剛性コア1の半径方向線分rに対して傾けて延在させた各プライコード2が、その半径方向線分rに近づくように延在姿勢を次第に変化させることで十分円滑に、かつ確実に行われることになるので、プライコードの引き抜け、製品タイヤの内表面へのプライコードの浮き出し等のおそれは十分に除去されることになる。   By the way, the expansion deformation of the raw tire 6 in this case is such that each ply cord 2 that is inclined and extended with respect to the radial line segment r of the rigid core 1 extends so as to approach the radial line segment r. Since the change is made smoothly and surely, the risk of pulling out the ply cord, raising the ply cord on the inner surface of the product tire, and the like is sufficiently removed.

そしてこの場合は、生タイヤ6の所定量の拡張変形に伴って、各プライコード2の延在姿勢を、剛性コア1の丁度半径方向とすることがより好適である。   In this case, it is more preferable that the extension posture of each ply cord 2 is just the radial direction of the rigid core 1 with a predetermined amount of expansion deformation of the raw tire 6.

以上、剛性コア1上で予め小さめに成型した生タイヤ6を、剛性コア1とともに加硫モールド内に装入して加硫する場合について説明したが、この生タイヤ6は、剛性コアから取り外して加硫モールド内へ装入することもでき、この場合も、成型された生タイヤ6は、製品タイヤより十分に小さい寸法を有することから、加硫モールドの型閉めに際する、ゴム噛み、はみ出し等の発生を、先の場合と同様に十分に防止することができる。   As described above, the raw tire 6 molded in a small size on the rigid core 1 has been described in the case where it is inserted into the vulcanization mold together with the rigid core 1 and vulcanized, but this raw tire 6 is removed from the rigid core. In this case, since the molded raw tire 6 has a size sufficiently smaller than that of the product tire, the rubber bite and the protrusion of the vulcanization mold are closed. And the like can be sufficiently prevented as in the previous case.

そしてこの場合は、好ましくは、生タイヤ内へ直接的に、または加硫ブラダ内へ高温加圧気体を供給することによって、その生タイヤ6を、プライコード2の、前述したと同様の姿勢変化に基いて円滑に拡張変形させて、その外面を加硫モールドの成形面に均等に密着させることで、加硫モールドからの熱および高温加圧気体の熱のそれぞれによって加硫することができる。   In this case, preferably, the raw tire 6 is changed in the posture of the ply cord 2 in the same manner as described above by supplying high-temperature pressurized gas directly into the raw tire or into the vulcanization bladder. Thus, the outer surface can be expanded and deformed smoothly, and the outer surface thereof can be brought into close contact with the molding surface of the vulcanization mold, whereby vulcanization can be carried out by heat from the vulcanization mold and heat from the high-temperature pressurized gas.

このようにして、生タイヤ6を、型閉め状態の加硫モールド内で、それの拡張変形下で加硫成形したときは、生タイヤ6を剛性コア1上で加硫すると否とにかかわらず、所期した通りの製品タイヤを高い精度をもって製造することができる。   In this way, when the green tire 6 is vulcanized and molded under its expanded deformation in a mold-closed vulcanization mold, regardless of whether the green tire 6 is vulcanized on the rigid core 1 or not. As expected, product tires can be manufactured with high accuracy.

剛性コア上へのプライコードの配設態様を例示する図である。It is a figure which illustrates the arrangement | positioning aspect of the ply cord on a rigid core. 剛性コア上の生タイヤの加硫工程を例示する断面図である。It is sectional drawing which illustrates the vulcanization process of the green tire on a rigid core. プライコードの延在姿勢の変化の態様を例示する図である。It is a figure which illustrates the aspect of a change of the extension attitude | position of a ply cord. ゴム噛み等の発生状況を例示する説明図である。It is explanatory drawing which illustrates generation | occurrence | production situations, such as rubber biting.

符号の説明Explanation of symbols

1 剛性コア
2 プライコード
3 クランパ
4 カーカスプライ素材
5 ビードコア
6 生タイヤ
7 トレッドセクタモールド
8,9 サイドモールド
10 インナーライナ素材
r 半径方向線分
θ 角度
1 Rigid Core 2 Ply Cord 3 Clamper 4 Carcass Ply Material 5 Bead Core 6 Raw Tire 7 Tread Sector Mold 8, 9 Side Mold 10 Inner Liner Material r Radial Line Segment θ Angle

Claims (8)

分解および組立てが可能なドーナツ状の剛性コア上に、非伸長性のプライコードを、その剛性コアの半径方向線分に対して所定角度傾けた状態で、周方向に所定の間隔をおいて複数配設して、一枚以上のカーカスプライ素材を形成するとともに、所要のタイヤ構成部材を所定の順序で積層して、製品タイヤより小径で、製品タイヤのトレッド部形成部分が、製品タイヤのトレッド部より狭幅の生タイヤを成型し、この生タイヤを、剛性コアとともに加硫モールド内へ装入して、加硫モールドの型閉めの状態で、その生タイヤを拡張変形させて加硫モールドの成形面に押出して生タイヤを加硫成形する空気入りラジアルタイヤの製造方法。   A plurality of non-extensible ply cords are tilted at a predetermined angle with respect to a radial line segment of the rigid core on a doughnut-shaped rigid core that can be disassembled and assembled at a predetermined interval in the circumferential direction. And forming one or more carcass ply materials, laminating required tire components in a predetermined order, having a smaller diameter than the product tire, and the tread portion forming portion of the product tire being the tread of the product tire A raw tire having a narrower width than the part is molded, and this raw tire is inserted into a vulcanization mold together with a rigid core, and the raw tire is expanded and deformed in a state where the vulcanization mold is closed. A pneumatic radial tire manufacturing method in which a green tire is vulcanized and molded by being extruded onto a molding surface. 加硫モールドの型閉めの後、生タイヤの拡張変形に先だって、生タイヤのインナーライナ素材を、加熱した剛性コアの周面に押圧して、そのインナーライナ素材を半加硫状態とする請求項1に記載の空気入りラジアルタイヤの製造方法。 After the mold closing of the vulcanization mold, prior to expansion deformation of the raw tire, the inner liner material of the raw tire is pressed against the peripheral surface of the heated rigid core so that the inner liner material is in a semi-vulcanized state. A method for producing a pneumatic radial tire according to claim 1. 生タイヤのインナーライナ素材を、加硫モールド内への加圧気体の吹き込みによって、剛性コアの周面に押圧する請求項2に記載の空気入りラジアルタイヤの製造方法。   The manufacturing method of the pneumatic radial tire of Claim 2 which presses the inner liner raw material of a raw tire to the surrounding surface of a rigid core by blowing the pressurized gas in a vulcanization mold. 生タイヤの拡張変形を、剛性コアと生タイヤとの間への高温加圧気体の吹き込みによって行わせる請求項1〜3のいずれかに記載の空気入りラジアルタイヤの製造方法。   The method for producing a pneumatic radial tire according to any one of claims 1 to 3, wherein expansion deformation of the raw tire is performed by blowing high-temperature pressurized gas between the rigid core and the raw tire. 生タイヤの拡張変形によって各プライコードを剛性コアの半径方向に延在させる請求項1〜4のいずれかに記載の空気入りラジアルタイヤの製造方法の製造方法。   The manufacturing method of the manufacturing method of the pneumatic radial tire in any one of Claims 1-4 which extend each ply cord to the radial direction of a rigid core by expansion deformation of a green tire. 分解および組立てが可能なドーナツ状の剛性コア上に、非伸長性のプライコードを、その剛性コアの半径方向線分に対して所定角度傾けた状態で、周方向に所定の間隔をおいて複数配設して、一枚以上のカーカスプライ素材を形成するとともに、所要のタイヤ構成部材を所定の順序で積層して、製品タイヤより小径で、製品タイヤのトレッド部形成部分が、製品タイヤのトレッド部より狭幅の生タイヤを成型し、この生タイヤを、剛性コアから取り外した状態で加硫モールド内へ装入して、加硫モールドの型閉めの状態で、その生タイヤを直接的に、または加硫ブラダを介して拡張変形させて加硫モールドの成形面に押出して生タイヤを加硫成形する空気入りラジアルタイヤの製造方法。   A plurality of non-extensible ply cords are tilted at a predetermined angle with respect to a radial line segment of the rigid core on a doughnut-shaped rigid core that can be disassembled and assembled at a predetermined interval in the circumferential direction. And forming one or more carcass ply materials, laminating required tire components in a predetermined order, having a smaller diameter than the product tire, and the tread portion forming portion of the product tire being the tread of the product tire A raw tire having a narrower width than the part is molded, and this raw tire is inserted into the vulcanization mold while being removed from the rigid core. Or a pneumatic radial tire manufacturing method in which a raw tire is vulcanized and molded by being expanded and deformed through a vulcanization bladder and extruded onto a molding surface of a vulcanization mold. 生タイヤの拡張変形を、生タイヤ内、または加硫ブラダ内への高温加圧気体の供給によって行う請求項6に記載の空気入りラジアルタイヤの製造方法。   The method for manufacturing a pneumatic radial tire according to claim 6, wherein the expansion deformation of the green tire is performed by supplying a high-temperature pressurized gas into the green tire or the vulcanized bladder. 生タイヤの拡張変形によって各プライコードを剛性コアの半径方向に延在させる請求項6もしくは7に記載の空気入りラジアルタイヤの製造方法。   The method for manufacturing a pneumatic radial tire according to claim 6 or 7, wherein each ply cord extends in a radial direction of the rigid core by expansion deformation of the green tire.
JP2007167929A 2007-06-26 2007-06-26 Method for manufacturing pneumatic radial tire Withdrawn JP2009006514A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120193010A1 (en) * 2011-01-31 2012-08-02 Toru Fukumoto Method for manufacturing pneumatic tire
JP2016215583A (en) * 2015-05-25 2016-12-22 住友ゴム工業株式会社 Method for producing tire
JP2017001373A (en) * 2015-06-16 2017-01-05 住友ゴム工業株式会社 Manufacturing method of pneumatic tire
CN109383056A (en) * 2018-11-22 2019-02-26 三角(威海)华盛轮胎有限公司 Asynchronous breathing tire vertical compression vulcanizes interior mold

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120193010A1 (en) * 2011-01-31 2012-08-02 Toru Fukumoto Method for manufacturing pneumatic tire
JP2016215583A (en) * 2015-05-25 2016-12-22 住友ゴム工業株式会社 Method for producing tire
JP2017001373A (en) * 2015-06-16 2017-01-05 住友ゴム工業株式会社 Manufacturing method of pneumatic tire
CN109383056A (en) * 2018-11-22 2019-02-26 三角(威海)华盛轮胎有限公司 Asynchronous breathing tire vertical compression vulcanizes interior mold
CN109383056B (en) * 2018-11-22 2024-01-09 三角(威海)华盛轮胎有限公司 Direct-pressure vulcanizing inner die for asynchronous expansion and shrinkage tire

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