JP2021112896A - Tire molding die and manufacturing method of pneumatic tire - Google Patents

Tire molding die and manufacturing method of pneumatic tire Download PDF

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JP2021112896A
JP2021112896A JP2020007630A JP2020007630A JP2021112896A JP 2021112896 A JP2021112896 A JP 2021112896A JP 2020007630 A JP2020007630 A JP 2020007630A JP 2020007630 A JP2020007630 A JP 2020007630A JP 2021112896 A JP2021112896 A JP 2021112896A
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tire
peripheral surface
surface side
temperature measuring
measuring probe
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JP7429546B2 (en
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倫一 中山
Tomoichi Nakayama
倫一 中山
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Toyo Tire Corp
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Toyo Tire Corp
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Abstract

To provide a tire molding die capable of accurately measuring a temperature of a pneumatic tire during vulcanization to ensure that an end of a vulcanization process is determined for each tire and having excellent durability of a temperature measuring probe, and a manufacturing method of the pneumatic tire using the tire molding die.SOLUTION: A tire molding die includes: fixing means in which at least one segment constituting a tread mold part that can be pressure-welded to a tread part fixes an outer peripheral surface side end of a temperature measurement probe; a temperature measurement probe insertion hole extending from the fixing means toward an inner peripheral surface side; and a temperature measurement probe having an outer peripheral surface side end fixed by the fixing means, extending inside the temperature measurement probe insertion hole toward the inner peripheral surface side, and mounted in a posture in which the inner peripheral surface side end extends beyond the inner peripheral surface side end of the temperature measurement probe insertion hole and can be embedded in a shoulder part of the tread part. An inner peripheral surface side surface of the temperature measurement probe insertion hole and a temperature measurement probe surface are formed so as to be screwable.SELECTED DRAWING: Figure 3

Description

本発明は、一対のビード部と、前記ビード部の各々からタイヤ径方向外側に延びるサイドウォール部と、前記サイドウォール部の各々のタイヤ径方向外側端に連なって踏面を構成するトレッド部とを備えた未加硫の生タイヤを加硫するタイヤ成型用金型に関する。 In the present invention, a pair of bead portions, a sidewall portion extending outward in the tire radial direction from each of the bead portions, and a tread portion which is connected to each tire radial outer end of the sidewall portion to form a tread surface. The present invention relates to a tire molding mold for vulcanizing a prepared unvulcanized raw tire.

ゴム製品である空気入りタイヤを製造する場合、その加硫工程はもっとも時間を要する工程となるため、加硫工程の時間短縮の努力が現在でも行われている。その一方で、加硫工程においてゴム部の加硫が不十分であると、ゴムの加硫反応により発生したエアが加硫ゴム内に残存し、かかる残存エアは製品段階でのタイヤ故障の原因となる場合がある。したがって、通常のタイヤ生産の現場では、季節要因などにより、例えば原料である未加硫の生タイヤの温度、金型内温度、雰囲気温度などがばらつく点を考慮し、加硫工程での全ばらつきを加味した余裕時間を加算して加硫工程に要する時間を設定している。 When manufacturing pneumatic tires, which are rubber products, the vulcanization process is the most time-consuming process, and efforts are still being made to shorten the vulcanization process time. On the other hand, if the rubber part is insufficiently vulcanized in the vulcanization process, the air generated by the vulcanization reaction of the rubber remains in the vulcanized rubber, and such residual air causes tire failure at the product stage. May be. Therefore, in a normal tire production site, considering that the temperature of raw unvulcanized tires, which are raw materials, the temperature inside the mold, the atmospheric temperature, etc., vary depending on seasonal factors, the total variation in the vulcanization process. The time required for the vulcanization process is set by adding the extra time in consideration of.

しかしながら、余裕時間の設定はタイヤの生産性向上の観点からは好ましくなく、タイヤ毎に加硫終了時を決定し、効率良く加硫工程を実行することが望まれていた。 However, setting the margin time is not preferable from the viewpoint of improving the productivity of the tire, and it has been desired to determine the end time of vulcanization for each tire and efficiently execute the vulcanization process.

下記特許文献1には、加硫工程が進行している間に加硫試料のインピーダンスを測定し、加硫試料の高分子抵抗値Rpの増加速度が急激に緩慢になる時点を最適の加硫停止時間とする、加硫試料の実時間加硫調節方法が記載されている。しかしながら、この方法では、加硫試料に対するインピーダンス測定を、2個の電極の間に加硫試料を挟んで測定する必要があり、しかもタイヤは通常、複合材料の積層体であるため、この方法をタイヤ加硫時のタイヤに応用することは困難である。 In Patent Document 1 below, the impedance of a vulcanized sample is measured while the vulcanization process is in progress, and the optimum vulcanization is when the rate of increase in the polymer resistance value Rp of the vulcanized sample suddenly slows down. A method for adjusting the real-time vulcanization of a vulcanized sample as an downtime is described. However, in this method, it is necessary to measure the impedance of the vulcanized sample by sandwiching the vulcanized sample between two electrodes, and since the tire is usually a laminate of composite materials, this method is used. It is difficult to apply it to tires during tire vulcanization.

特開2003−211459号公報Japanese Unexamined Patent Publication No. 2003-21459

本発明は上記実情に鑑みてなされたものであり、その目的は、タイヤ毎に加硫工程の終了時点を確実に決定するために、加硫中の空気入りタイヤの温度を正確に測定可能であり、かつ温度測定プローブの耐久性に優れたタイヤ成型用金型および該タイヤ成型用金型を使用した空気入りタイヤの製造方法を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to be able to accurately measure the temperature of a pneumatic tire during vulcanization in order to surely determine the end time of the vulcanization process for each tire. It is an object of the present invention to provide a tire molding die having excellent durability of a temperature measuring probe and a method for manufacturing a pneumatic tire using the tire molding die.

上記目的は、下記の如き本発明により達成できる。即ち本発明は、一対のビード部と、前記ビード部の各々からタイヤ径方向外側に延びるサイドウォール部と、前記サイドウォール部の各々のタイヤ径方向外側端に連なって踏面を構成するトレッド部とを備えた未加硫の生タイヤを加硫するタイヤ成型用金型であって、前記トレッド部に圧接可能なトレッド型部を少なくとも備え、前記トレッド型部は、周方向に分割されて、前記生タイヤの径方向に移動可能な複数のセグメントを有し、前記セグメントの少なくとも一つは、温度測定プローブの外周面側端を固定する固定手段と、前記固定手段から内周面側に向かって延びる温度測定プローブ挿入穴と、前記固定手段により外周面側端が固定され、前記温度測定プローブ挿入穴内を内周面側に向かって延び、内周面側端が前記温度測定プローブ挿入穴の内周面側端を超えて前記トレッド部のショルダー部内に埋設可能な姿勢で取り付けられた温度測定プローブとを備え、前記温度測定プローブ挿入穴の内周面側側面に形成された凸部と前記温度測定プローブ表面とが接触することにより、前記温度測定プローブが固定されていることを特徴とするタイヤ成型用金型に関する。 The above object can be achieved by the present invention as described below. That is, the present invention includes a pair of bead portions, a sidewall portion extending outward in the tire radial direction from each of the bead portions, and a tread portion that is connected to each tire radial outer end of the sidewall portion to form a tread surface. A tire molding die for smelting an unvulked raw tire provided with, wherein the tread mold portion is provided with at least a tread mold portion that can be pressure-welded to the tread portion, and the tread mold portion is divided in the circumferential direction. It has a plurality of segments that can move in the radial direction of the raw tire, and at least one of the segments has a fixing means for fixing the outer peripheral surface side end of the temperature measuring probe and the fixing means toward the inner peripheral surface side. The extending temperature measurement probe insertion hole and the outer peripheral surface side end are fixed by the fixing means, the inside of the temperature measurement probe insertion hole extends toward the inner peripheral surface side, and the inner peripheral surface side end is inside the temperature measurement probe insertion hole. A temperature measuring probe mounted in a posture capable of being embedded in the shoulder portion of the tread portion beyond the peripheral surface side end is provided, and a convex portion formed on the inner peripheral surface side side surface of the temperature measuring probe insertion hole and the temperature. The present invention relates to a tire molding mold, characterized in that the temperature measuring probe is fixed by contact with the surface of the measuring probe.

上記タイヤ成型用金型において、前記凸部が、前記温度測定プローブ挿入穴の内周面側側面に形成された雄ネジ部であり、前記雄ネジ部の頂部と前記温度測定プローブ表面とが接触することにより、前記温度測定プローブが固定されていることが好ましい。 In the tire molding die, the convex portion is a male screw portion formed on the inner peripheral surface side side surface of the temperature measurement probe insertion hole, and the top of the male screw portion is in contact with the surface of the temperature measurement probe. By doing so, it is preferable that the temperature measuring probe is fixed.

上記タイヤ成型用金型において、前記凸部が、前記温度測定プローブ挿入穴の内周面側端から深さ方向にL1の範囲に形成されており、前記温度測定プローブ挿入穴の内周面側端から外周面側端までの前記温度測定プローブ挿入穴の深さLに対し、0.02≦L1/L≦0.05であることが好ましい。 In the tire molding mold, the convex portion is formed in the range of L1 in the depth direction from the inner peripheral surface side end of the temperature measuring probe insertion hole, and is formed on the inner peripheral surface side of the temperature measuring probe insertion hole. It is preferable that 0.02 ≦ L1 / L ≦ 0.05 with respect to the depth L of the temperature measuring probe insertion hole from the end to the end on the outer peripheral surface side.

前記L1の長さが少なくとも5mm以上であることが好ましい。 The length of L1 is preferably at least 5 mm or more.

上記タイヤ成型用金型において、前記温度測定プローブの外径が1〜10mmであることが好ましい。 In the tire molding die, the outer diameter of the temperature measuring probe is preferably 1 to 10 mm.

上記タイヤ成型用金型において、前記温度測定プローブが、プラチナ測温抵抗体であることが好ましい。 In the tire molding die, it is preferable that the temperature measuring probe is a platinum resistance temperature detector.

また、本発明は、前記いずれかに記載のタイヤ成型用金型内で加硫する加硫工程を含む空気入りタイヤの製造方法であって、前記加硫工程が、一対のビード部と、前記ビード部の各々からタイヤ径方向外側に延びるサイドウォール部と、前記サイドウォール部の各々のタイヤ径方向外側端に連なって踏面を構成するトレッド部とを備えた未加硫の生タイヤのトレッド部に含まれるショルダー部に温度測定プローブを埋設することにより、前記ショルダー部の温度を測定する工程を含むことを特徴とする空気入りタイヤの製造方法に関する。 Further, the present invention is a method for manufacturing a pneumatic tire including a vulcanization step of vulcanizing in the tire molding mold according to any one of the above, wherein the vulcanization step includes a pair of bead portions and the above. A tread portion of an unvulcanized raw tire provided with a sidewall portion extending outward in the tire radial direction from each of the bead portions and a tread portion connecting to the tire radial outer end of each of the sidewall portions to form a tread surface. The present invention relates to a method for manufacturing a pneumatic tire, which comprises a step of measuring the temperature of the shoulder portion by embedding a temperature measuring probe in the shoulder portion included in the above.

本発明に係るタイヤ成型用金型は、少なくともトレッド型部が周方向に分割された、所謂「セグメンタルモールド」であり、セグメントの少なくとも1つに、上記特定の温度測定プローブを備える。これにより、加硫中の空気入りタイヤの温度、特にはタイヤの加硫が最も進行し難いトレッド部のショルダー部の温度を正確に測定することができる。 The tire molding die according to the present invention is a so-called "segmental mold" in which at least the tread mold portion is divided in the circumferential direction, and at least one of the segments includes the above-mentioned specific temperature measuring probe. This makes it possible to accurately measure the temperature of the pneumatic tire during vulcanization, particularly the temperature of the shoulder portion of the tread portion where vulcanization of the tire is most difficult to proceed.

本発明に係るタイヤ成型用金型では、生タイヤのトレッド部のショルダー部に、温度測定プローブが押し込まれつつ埋設される。一般的には、ショルダー部を構成するゴム部が未加硫状態であっても、ゴム中に温度測定プローブが押し込まれる際、温度測定プローブには大きな負荷が掛かり、場合によっては温度測定プローブが湾曲してしまう虞がある。しかしながら、本発明に係るタイヤ成型用金型では、温度測定プローブ挿入穴の内周面側側面に形成された凸部と温度測定プローブ表面とが接触することにより、温度測定プローブが固定されている。これにより、固定手段のみによって温度測定プローブの外周面側端を固定する構成に比して、温度測定プローブがより安定的に保持されるため、温度測定プローブの湾曲などの変形を防止し、温度測定プローブの耐久性を向上することができる。 In the tire molding die according to the present invention, the temperature measuring probe is embedded in the shoulder portion of the tread portion of the raw tire while being pushed. In general, even if the rubber part constituting the shoulder part is in an unvulcanized state, when the temperature measuring probe is pushed into the rubber, a large load is applied to the temperature measuring probe, and in some cases, the temperature measuring probe is used. There is a risk of bending. However, in the tire molding die according to the present invention, the temperature measuring probe is fixed by the contact between the convex portion formed on the inner peripheral surface side side surface of the temperature measuring probe insertion hole and the surface of the temperature measuring probe. .. As a result, the temperature measurement probe is held more stably as compared with the configuration in which the outer peripheral surface side end of the temperature measurement probe is fixed only by the fixing means, so that deformation such as bending of the temperature measurement probe is prevented and the temperature is increased. The durability of the measuring probe can be improved.

特に、本発明に係るタイヤ成型用金型において、凸部として、温度測定プローブ挿入穴の内周面側側面に雄ネジ部が形成されており、雄ネジ部の頂部と温度測定プローブ表面とが接触することにより、温度測定プローブが固定されている場合、複数の雄ネジ部の頂部で温度測定プローブをより安定的に保持することができる。加えて、隣り合う雄ネジ部と温度測定プローブ表面との間には空気層が形成されるため、金型から温度測定プローブへの熱伝導をより小さくすることができる。その結果、加硫中の空気入りタイヤの温度をより正確に測定することができる。 In particular, in the tire molding mold according to the present invention, a male screw portion is formed as a convex portion on the inner peripheral surface side side surface of the temperature measurement probe insertion hole, and the top of the male screw portion and the surface of the temperature measurement probe are formed. By contacting, when the temperature measuring probe is fixed, the temperature measuring probe can be held more stably at the tops of the plurality of male threads. In addition, since an air layer is formed between the adjacent male threaded portions and the surface of the temperature measuring probe, the heat conduction from the mold to the temperature measuring probe can be further reduced. As a result, the temperature of the pneumatic tire during vulcanization can be measured more accurately.

本発明において製造可能なタイヤの一例を示すタイヤ子午線断面図A tire meridian cross-sectional view showing an example of a tire that can be manufactured in the present invention. 本発明のタイヤ成型用金型を概念的に示す断面図Cross-sectional view conceptually showing the tire molding die of the present invention 本発明の金型のトレッド型部を構成するセグメントにおいて、ショルダー部に温度測定プローブを埋設する状態を概念的に示す断面図Cross-sectional view conceptually showing a state in which a temperature measuring probe is embedded in a shoulder portion in a segment constituting the tread mold portion of the mold of the present invention.

本発明の実施の形態について図面を参照しながら説明する。図1に示した生タイヤ9は、一対のビード部1と、ビード部1の各々からタイヤ径方向外側に延びるサイドウォール部2と、サイドウォール部2の各々のタイヤ径方向外側端に連なって踏面を構成するトレッド部3とを備えた空気入りタイヤである。ビード部1には、環状のビードコア1aが配されている。 Embodiments of the present invention will be described with reference to the drawings. The raw tire 9 shown in FIG. 1 is connected to a pair of bead portions 1, a sidewall portion 2 extending outward in the tire radial direction from each of the bead portions 1, and each tire radial outer end of the sidewall portion 2. It is a pneumatic tire provided with a tread portion 3 constituting a tread surface. An annular bead core 1a is arranged in the bead portion 1.

カーカス層4は、トレッド部3からサイドウォール部2を経てビード部1に至り、その端部がビードコア1aを介して折り返されている。カーカス層4は、少なくとも一枚のカーカスプライによって構成される。カーカスプライは、タイヤ周方向に対して略90°の角度で延びるカーカスコードをトッピングゴムで被覆して形成されている。 The carcass layer 4 reaches the bead portion 1 from the tread portion 3 through the sidewall portion 2, and the end portion thereof is folded back via the bead core 1a. The carcass layer 4 is composed of at least one carcass ply. The carcass ply is formed by covering a carcass cord extending at an angle of approximately 90 ° with respect to the tire circumferential direction with a topping rubber.

ベルト層5は、トレッド部3でカーカス層4の外側に貼り合わされ、トレッドゴム6により外側から覆われている。ベルト層5は、複数枚(本実施形態では二枚)のベルトプライによって構成される。各ベルトプライは、タイヤ周方向に対して傾斜して延びるベルトコードをトッピングゴムで被覆して形成され、該ベルトコードがプライ間で互いに逆向きに交差するように積層されている。 The belt layer 5 is attached to the outside of the carcass layer 4 at the tread portion 3, and is covered from the outside by the tread rubber 6. The belt layer 5 is composed of a plurality of belt plies (two in the present embodiment). Each belt ply is formed by covering a belt cord extending in an inclined direction with respect to the tire circumferential direction with a topping rubber, and the belt cords are laminated so as to intersect each other in opposite directions between the plies.

トレッドゴム6は、1層のみで構成しても良く、タイヤ径方向内側のベーストレッドと、その外周側に位置するキャップトレッドとを有する、所謂キャップベース構造で構成してもよい。 The tread rubber 6 may be composed of only one layer, or may be composed of a so-called cap base structure having a base tread on the inner side in the tire radial direction and a cap tread located on the outer peripheral side thereof.

図1に示した生タイヤ9は、未加硫状態の生タイヤであり、後述する加硫工程において、製品タイヤの形状にシェーピングされる(図2参照)とともに、そのトレッド表面には種々のトレッドパターンが形成される。 The raw tire 9 shown in FIG. 1 is a raw tire in an unvulcanized state, and is shaped into the shape of a product tire in a vulcanization step described later (see FIG. 2), and various treads are formed on the tread surface thereof. A pattern is formed.

生タイヤ9の加硫成形では、本発明に係るタイヤ成型用金型(以下、単に「金型」ともいう)が使用される。図2に本発明のタイヤ成型用金型を概念的に表した断面図を示す。この金型10には、生タイヤ9が未加硫状態のままセットされ、その金型10内の生タイヤ9に加熱加圧を施すことで加硫工程が行われる。 In the vulcanization molding of the raw tire 9, the tire molding die according to the present invention (hereinafter, also simply referred to as “mold”) is used. FIG. 2 shows a cross-sectional view conceptually showing the tire molding die of the present invention. The raw tire 9 is set in the mold 10 in an unvulcanized state, and the vulcanization step is performed by applying heat and pressure to the raw tire 9 in the mold 10.

金型10は、生タイヤ9のトレッド部3に圧接可能なトレッド型部11を少なくとも備える。本実施形態では、金型10は、生タイヤ9の踏面に接するトレッド型部11と、下方を向いたタイヤ外面に接する下型部12と、上方を向いたタイヤ外面に接する上型部13とを備える。これらは、周囲に設置された開閉機構(不図示)によって、型締め状態と金型開放状態との間で変位自在に構成され、かかる開閉機構の構造は周知である。トレッド型部11はさらに周方向に複数個のセグメントに分割されており、金型10内に配設される生タイヤ9の径方向に移動可能となっている。また、金型10には、電気ヒータや蒸気ジャケットなどの熱源を有するプラテン板(不図示)が設けられており、これによって各型部の加熱が行われる。 The mold 10 includes at least a tread mold portion 11 that can be pressure-welded to the tread portion 3 of the raw tire 9. In the present embodiment, the mold 10 includes a tread mold portion 11 in contact with the tread surface of the raw tire 9, a lower mold portion 12 in contact with the tire outer surface facing downward, and an upper mold portion 13 in contact with the tire outer surface facing upward. To be equipped with. These are configured to be displaceable between the mold tightening state and the mold open state by an opening / closing mechanism (not shown) installed around them, and the structure of such an opening / closing mechanism is well known. The tread mold portion 11 is further divided into a plurality of segments in the circumferential direction, and is movable in the radial direction of the raw tire 9 arranged in the mold 10. Further, the mold 10 is provided with a platen plate (not shown) having a heat source such as an electric heater or a steam jacket, whereby each mold portion is heated.

金型10の中心部には、タイヤと同軸状に中心機構14が設けられ、これの周囲にトレッド型部11、下型部12および上型部13が設置されている。中心機構14は、ゴム袋状のブラダー15と、タイヤ軸方向に延びるセンターポスト16とを有し、センターポスト16には、ブラダー15の端部を把持する上部クランプ17と下部クランプ18が設けられている。 A central mechanism 14 is provided coaxially with the tire in the central portion of the mold 10, and a tread mold portion 11, a lower mold portion 12, and an upper mold portion 13 are installed around the central mechanism 14. The central mechanism 14 has a rubber bag-shaped bladder 15 and a center post 16 extending in the tire axial direction, and the center post 16 is provided with an upper clamp 17 and a lower clamp 18 for gripping the end portion of the bladder 15. ing.

中心機構14には、ブラダー15内への加熱媒体の供給を行うための媒体供給路21が上下に延設され、その媒体供給路21の上端に噴出し口22が形成されている。媒体供給路21には、加熱媒体供給源23から供給された加熱媒体や、加圧媒体供給源26から供給された加圧媒体が流れる供給配管24が接続されている。加熱媒体は、バルブ25の開閉操作に応じて供給され、加圧媒体は、バルブ28の開閉操作に応じて供給される。 In the central mechanism 14, a medium supply path 21 for supplying the heating medium into the bladder 15 is extended vertically, and an ejection port 22 is formed at the upper end of the medium supply path 21. A heating medium supplied from the heating medium supply source 23 and a supply pipe 24 through which the pressure medium supplied from the pressure medium supply source 26 flows are connected to the medium supply path 21. The heating medium is supplied according to the opening / closing operation of the valve 25, and the pressurizing medium is supplied according to the opening / closing operation of the valve 28.

また、中心機構14には、ブラダー15内の加熱媒体と加圧媒体とが混合された高温高圧流体を排出するための媒体排出路31が上下に延設され、その媒体排出路31の上端に回収口32が形成されている。媒体排出路31には、高温高圧流体が流れる排出配管34が接続され、その開閉を操作するブローバルブ33を排出配管34に設けている。ポンプ35は、媒体排出路31を通る高温高圧流体が媒体供給路21を経由してブラダー15の内部に再供給されるように、高温高圧流体を強制循環させる手法を用いても構わない。 Further, in the central mechanism 14, a medium discharge path 31 for discharging a high-temperature and high-pressure fluid in which a heating medium and a pressure medium in the bladder 15 are mixed is extended vertically at the upper end of the medium discharge path 31. A collection port 32 is formed. A discharge pipe 34 through which a high-temperature and high-pressure fluid flows is connected to the medium discharge passage 31, and a blow valve 33 for operating the opening / closing of the discharge pipe 34 is provided in the discharge pipe 34. The pump 35 may use a method of forcibly circulating the high-temperature and high-pressure fluid so that the high-temperature and high-pressure fluid passing through the medium discharge path 31 is resupplied to the inside of the bladder 15 via the medium supply path 21.

以下、本発明の金型10が備えるトレッド型部11を構成するセグメント41について説明する。図3は、本発明の金型のトレッド型部を構成するセグメントにおいて、ショルダー部3Sに温度測定プローブ44を埋設する状態を概念的に示す断面図を示す。図3において、「内周面側」とは生タイヤ9が金型10にセットされる際、生タイヤ9に近い側を意味する。セグメント41は、トレッド型部11が、例えば周方向に6〜12分割されたものの一つであり、その各々が生タイヤ9の径方向に移動することにより、生タイヤ9のトレッド部3に圧接可能となっている。セグメント41の分割数は、6〜12の範囲内で奇数であることがより好ましい。 Hereinafter, the segments 41 constituting the tread mold portion 11 included in the mold 10 of the present invention will be described. FIG. 3 is a cross-sectional view conceptually showing a state in which the temperature measuring probe 44 is embedded in the shoulder portion 3S in the segment constituting the tread mold portion of the mold of the present invention. In FIG. 3, the “inner peripheral surface side” means the side close to the raw tire 9 when the raw tire 9 is set in the mold 10. The segment 41 is one in which the tread mold portion 11 is divided into, for example, 6 to 12 in the circumferential direction, and each of them moves in the radial direction of the raw tire 9 to press-contact the tread portion 3 of the raw tire 9. It is possible. It is more preferable that the number of divisions of the segment 41 is an odd number in the range of 6 to 12.

セグメント41の少なくとも一つは、温度測定プローブ44を固定する固定手段42と、固定手段42から内周面側に向かって延びる温度測定プローブ挿入穴43と、固定手段42により固定され、温度測定プローブ挿入穴43内を内周面側に向かって延び、内周面側端が温度測定プローブ挿入穴43の内周面側端Iを超えてトレッド部3のショルダー部3S内に埋設可能な姿勢で取り付けられた温度測定プローブ44とを備える。かかる温度測定プローブ44は、複数のセグメント41のうちの一つに取り付けてもよく、複数のセグメント41に取り付けてもよく、全部のセグメント41に取り付けてもよい。 At least one of the segments 41 is fixed by the fixing means 42 for fixing the temperature measuring probe 44, the temperature measuring probe insertion hole 43 extending from the fixing means 42 toward the inner peripheral surface side, and the fixing means 42, and the temperature measuring probe is fixed. The inside of the insertion hole 43 extends toward the inner peripheral surface side, and the end on the inner peripheral surface side exceeds the inner peripheral surface side end I of the temperature measurement probe insertion hole 43 and can be embedded in the shoulder portion 3S of the tread portion 3. It includes an attached temperature measuring probe 44. The temperature measuring probe 44 may be attached to one of a plurality of segments 41, may be attached to a plurality of segments 41, or may be attached to all the segments 41.

温度測定プローブ44を固定する固定手段42は、例えば外周面側をダブルナットなどで構成し、内周面側をネジ構造で構成することにより、温度測定プローブ穴43からの温度測定プローブ44の突出高さを調製可能となるように設計可能である。 The fixing means 42 for fixing the temperature measuring probe 44 has, for example, a double nut on the outer peripheral surface side and a screw structure on the inner peripheral surface side, so that the temperature measuring probe 44 protrudes from the temperature measuring probe hole 43. It can be designed so that the height can be adjusted.

固定手段42の内周面側には、温度測定プローブ挿入穴43が形成されている。温度測定プローブ挿入穴43の配設方向としては後述のとおり、生タイヤ9の径方向とすることが好ましい。温度測定プローブ挿入穴43の内周面側は開口しており、温度測定プローブ44が金型10のキャビティ内に突出し、トレッド部3のショルダー部3S内に埋設可能となるように設計されている。 A temperature measurement probe insertion hole 43 is formed on the inner peripheral surface side of the fixing means 42. As will be described later, the temperature measurement probe insertion hole 43 is preferably arranged in the radial direction of the raw tire 9. The inner peripheral surface side of the temperature measuring probe insertion hole 43 is open, and the temperature measuring probe 44 is designed so as to protrude into the cavity of the mold 10 and be embedded in the shoulder portion 3S of the tread portion 3. ..

温度測定プローブ44は、外周面側の端部が固定手段42により固定され、温度測定プローブ挿入穴43内を内周面側に向かって延び、内周面側端が温度測定プローブ挿入穴43の内周面側端Iを超えてトレッド部3のショルダー部3S内に埋設可能な姿勢で取り付けられている。温度測定プローブ44の配設方向としては後述のとおり、生タイヤ9の径方向とすることが好ましい。また、温度測定プローブ44の断面形状は特に限定されないが、円形状であることが好ましい。 The end of the temperature measuring probe 44 on the outer peripheral surface side is fixed by the fixing means 42, extends in the temperature measuring probe insertion hole 43 toward the inner peripheral surface side, and the end on the inner peripheral surface side is the temperature measuring probe insertion hole 43. It is attached in a posture that it can be embedded in the shoulder portion 3S of the tread portion 3 beyond the inner peripheral surface side end I. As described later, the temperature measuring probe 44 is preferably arranged in the radial direction of the raw tire 9. The cross-sectional shape of the temperature measuring probe 44 is not particularly limited, but is preferably circular.

前記のとおり、セグメント41は生タイヤ9の径方向に移動するため、温度測定プローブ44の配設方向も生タイヤ9の径方向とした場合、温度測定プローブ44をショルダー部3S内に埋設する際、負荷が最も少なくなるため好ましい。温度測定プローブ44への負荷軽減を考慮した場合、セグメント41が径方向に移動する際の進行方向と、温度測定プローブ44の径方向への配設方向とのズレは、3°以下であることが好ましく、1°以下であることがより好ましい。 As described above, since the segment 41 moves in the radial direction of the raw tire 9, when the temperature measuring probe 44 is arranged in the radial direction of the raw tire 9, the temperature measuring probe 44 is embedded in the shoulder portion 3S. , It is preferable because the load is the least. Considering the reduction of the load on the temperature measuring probe 44, the deviation between the traveling direction when the segment 41 moves in the radial direction and the radial arrangement direction of the temperature measuring probe 44 is 3 ° or less. Is preferable, and more preferably 1 ° or less.

図3に記載のとおり、本実施形態では温度測定プローブ挿入穴43の内周面側側面には、凸部としての雄ネジ部4Mが形成され、雄ネジ部4Mの頂部と温度測定プローブ44表面とが接触することにより、温度測定プローブ44が固定されている。かかる構成によれば、温度測定プローブ44が温度測定プローブ挿入穴43内で安定的に保持されるため、温度測定プローブ44の湾曲などの変形を防止し、温度測定プローブ44の耐久性を向上することができる。また、隣り合う雄ネジ部4Mと温度測定プローブ44表面との間には空気層が形成されるため、金型から温度測定プローブへの熱伝導をより小さくすることができる。 As described in FIG. 3, in the present embodiment, a male screw portion 4M as a convex portion is formed on the inner peripheral surface side side surface of the temperature measurement probe insertion hole 43, and the top of the male screw portion 4M and the surface of the temperature measurement probe 44. The temperature measuring probe 44 is fixed by the contact with the temperature measuring probe 44. According to such a configuration, since the temperature measuring probe 44 is stably held in the temperature measuring probe insertion hole 43, deformation such as bending of the temperature measuring probe 44 is prevented, and the durability of the temperature measuring probe 44 is improved. be able to. Further, since an air layer is formed between the adjacent male screw portions 4M and the surface of the temperature measuring probe 44, the heat conduction from the mold to the temperature measuring probe can be further reduced.

温度測定プローブ挿入穴43の内周面側側面に形成された雄ネジ部4Mは、温度測定プローブ挿入穴43の内周面側側面のいずれの場所に形成されてもよいが、温度測定プローブ挿入穴43の内周面側端Iから外周面側に向かって形成されることが好ましい。また、雄ネジ部4Mは、温度測定プローブ挿入穴43の内周面側端Iから深さ方向にL1の範囲に形成されており、温度測定プローブ挿入穴43の内周面側端Iから外周面側端Oまでの温度測定プローブ挿入穴43の深さLに対し、0.02≦L1/L≦0.05であることが好ましい。かかる構成によれば、温度測定プローブ44が温度測定プローブ挿入穴43内でより安定的に保持されるため、温度測定プローブ44の湾曲などの変形をより確実に防止し、温度測定プローブ44の耐久性をさらに向上することができる。L1の長さは温度測定プローブ44の長さに応じて任意に設計可能であるが、例えば5mm以上であることが好ましい。 The male screw portion 4M formed on the inner peripheral surface side side surface of the temperature measurement probe insertion hole 43 may be formed at any position on the inner peripheral surface side side surface of the temperature measurement probe insertion hole 43, but the temperature measurement probe insertion. It is preferable that the hole 43 is formed from the inner peripheral surface side end I toward the outer peripheral surface side. Further, the male screw portion 4M is formed in the range of L1 from the inner peripheral surface side end I of the temperature measuring probe insertion hole 43 in the depth direction, and is formed from the inner peripheral surface side end I of the temperature measuring probe insertion hole 43 to the outer circumference. It is preferable that 0.02 ≦ L1 / L ≦ 0.05 with respect to the depth L of the temperature measurement probe insertion hole 43 up to the surface side end O. According to such a configuration, since the temperature measuring probe 44 is held more stably in the temperature measuring probe insertion hole 43, deformation such as bending of the temperature measuring probe 44 can be more reliably prevented, and the durability of the temperature measuring probe 44 can be prevented. The sex can be further improved. The length of L1 can be arbitrarily designed according to the length of the temperature measuring probe 44, but is preferably 5 mm or more, for example.

本実施形態では、温度測定プローブ挿入穴43の内周面側端Iでの内径D1よりも外周面側端Oでの内径D2が大きく設計されている。かかる構成よれば、外周面側において、温度測定プローブ44と温度測定プローブ穴43との間の隙間部分をより大きく確保できるため、温度測定プローブ44によってトレッド部3のショルダー部3S内の温度を測定する際、金型10からの温度測定プローブ44への熱伝導をより少なくすることが可能となり、トレッド部3のショルダー部3S内の温度をより正確に測定することができる。温度測定プローブ挿入穴43において、内径がD1よりも大きくなる部分の深さ方向長さをL2としたとき、L2/L≦0.9であることが好ましい。温度測定プローブ44の外径としては、例えば1〜10mm程度が好ましい。 In the present embodiment, the inner diameter D2 at the outer peripheral surface side end O is designed to be larger than the inner diameter D1 at the inner peripheral surface side end I of the temperature measurement probe insertion hole 43. According to this configuration, a larger gap between the temperature measuring probe 44 and the temperature measuring probe hole 43 can be secured on the outer peripheral surface side, so that the temperature inside the shoulder portion 3S of the tread portion 3 is measured by the temperature measuring probe 44. At that time, the heat conduction from the mold 10 to the temperature measuring probe 44 can be further reduced, and the temperature in the shoulder portion 3S of the tread portion 3 can be measured more accurately. In the temperature measurement probe insertion hole 43, when the length in the depth direction of the portion having an inner diameter larger than D1 is L2, it is preferable that L2 / L ≦ 0.9. The outer diameter of the temperature measuring probe 44 is preferably about 1 to 10 mm, for example.

本発明において、加硫温度を測定する際に使用する温度測定プローブとして、金属の電気抵抗が温度変化に対して変化する性質を利用した測温抵抗体を使用することができる。かかる金属としては、プラチナ、ニッケル、および銅などが例示可能であるが、本発明においては、温度変化に対する抵抗値変化(感度)が大きく、その結果、温度変化に対する感度が非常に高い白金測温抵抗体を特に好適に使用することができる。 In the present invention, as a temperature measuring probe used when measuring the vulcanization temperature, a resistance temperature measuring resistor utilizing the property that the electric resistance of a metal changes with respect to a temperature change can be used. Examples of such metals include platinum, nickel, and copper, but in the present invention, the resistance value change (sensitivity) to a temperature change is large, and as a result, the platinum temperature measurement is extremely sensitive to a temperature change. Resistors can be used particularly preferably.

次に、本発明の空気入りタイヤの製造方法における加硫工程について具体的に説明する。 Next, the vulcanization step in the method for producing a pneumatic tire of the present invention will be specifically described.

まず、図2のように金型10内に生タイヤ9をセットし、膨張させたブラダー15によって生タイヤ9を金型10の内面形状近くまでシェーピングする。これにより、生タイヤ9は、ブラダー15によって保持され、トレッド型部11、下型部12および上型部13の各々に宛がわれる。この時点で、生タイヤ9の加硫最遅部に温度測定プローブを埋設する。加硫最遅部とは、タイヤの加硫が最も進行し難い部位を意味し、通常はトレッド部3のショルダー部を意味する。特にショルダー部の中でも、加硫後のトレッド部3の内表面の法線に沿って測定される、トレッド部3の厚みが最大になる位置を加硫最遅部とすることが好ましい。いずれにせよ、本発明においては、加硫最遅部における加硫温度を測定するため、温度測定プローブを生タイヤ9の加硫最遅部に埋設する。埋設方法としては、例えば温度測定プローブ44をトレッド型部11のショルダー部に対応する位置に配設し、トレッド型部11が生タイヤ9の径方向に移動して生タイヤ9が宛がわれる際、温度測定プローブ44が生タイヤ9内に押し込まれつつ埋設されるように設計することが考えられる。このように生タイヤ9内に埋設された温度測定プローブ44により、加硫工程時には生タイヤ9の温度を測定し、加硫工程終了時にはトレッド型部11を含む金型10からタイヤを脱型する際に加硫最遅部から温度測定プローブを同時に抜き取ればよい。 First, as shown in FIG. 2, the raw tire 9 is set in the mold 10, and the raw tire 9 is shaped to be close to the inner surface shape of the mold 10 by the expanded bladder 15. As a result, the raw tire 9 is held by the bladder 15 and addressed to each of the tread mold portion 11, the lower mold portion 12, and the upper mold portion 13. At this point, the temperature measuring probe is embedded in the slowest part of the vulcanization of the raw tire 9. The slowest vulcanization portion means a portion where vulcanization of the tire is most difficult to proceed, and usually means a shoulder portion of the tread portion 3. In particular, among the shoulder portions, the position where the thickness of the tread portion 3 is maximized, which is measured along the normal of the inner surface of the tread portion 3 after vulcanization, is preferably the slowest vulcanization portion. In any case, in the present invention, in order to measure the vulcanization temperature in the slowest vulcanization portion, the temperature measuring probe is embedded in the slowest vulcanization portion of the raw tire 9. As an embedding method, for example, when the temperature measuring probe 44 is arranged at a position corresponding to the shoulder portion of the tread mold portion 11 and the tread mold portion 11 moves in the radial direction of the raw tire 9 and the raw tire 9 is addressed. It is conceivable that the temperature measuring probe 44 is designed to be embedded while being pushed into the raw tire 9. The temperature measuring probe 44 embedded in the raw tire 9 measures the temperature of the raw tire 9 at the time of the vulcanization process, and removes the tire from the mold 10 including the tread mold portion 11 at the end of the vulcanization process. At the same time, the temperature measuring probe may be extracted from the slowest part of the vulcanization at the same time.

続いて、金型10を加熱してタイヤ9をタイヤ外面側から加熱する外側加熱と、金型10内のブラダー15に高温の加熱媒体を供給してタイヤ9をタイヤ内面側から加熱する内側加熱とからなる加熱を行い、生タイヤ9の加硫を実行する。金型10は、上記の蒸気ジャケットなどにより予め加熱されていて、これにより外側加熱が行われる。内側加熱は、タイヤ9のシェーピング後に、媒体供給路21を通じてブラダー15内に加熱媒体を供給することで行われる。加熱媒体を所定時間供給した後、引き続いてブラダー15内に加圧媒体を供給し、タイヤ9を高圧で加圧する。加熱媒体としては、例えばスチームや高温水が使用され、加圧媒体としては、例えば窒素ガスなどの不活性ガスやスチームが使用される。 Subsequently, outside heating is performed by heating the mold 10 to heat the tire 9 from the tire outer surface side, and inside heating is performed by supplying a high-temperature heating medium to the bladder 15 in the mold 10 to heat the tire 9 from the tire inner surface side. The raw tire 9 is vulcanized by heating the tire. The mold 10 is preheated by the steam jacket or the like described above, whereby the outside heating is performed. The inner heating is performed by supplying the heating medium into the bladder 15 through the medium supply path 21 after shaping the tire 9. After supplying the heating medium for a predetermined time, the pressurizing medium is subsequently supplied into the bladder 15 to pressurize the tire 9 at a high pressure. As the heating medium, for example, steam or high-temperature water is used, and as the pressure medium, for example, an inert gas such as nitrogen gas or steam is used.

温度測定プローブ44により、加硫中の生タイヤの温度の時系列データを取得することができる。かかる時系列データの取得には、市場において一般に流通する高精度デジタルデータロガー(温度分解能0.001℃程度、精度±0.005℃程度、温度値の最小取得間隔1秒)を使用可能である。取得した時系列データを解析することにより、タイヤ毎に加硫工程の終了時点を確実に決定することができる。 The temperature measurement probe 44 can acquire time series data of the temperature of the raw tire during vulcanization. For the acquisition of such time-series data, a high-precision digital data logger generally distributed in the market (temperature resolution of about 0.001 ° C., accuracy of about ± 0.005 ° C., minimum temperature value acquisition interval of 1 second) can be used. .. By analyzing the acquired time series data, it is possible to reliably determine the end time point of the vulcanization process for each tire.

加硫工程終了後は、金型10を開放状態としつつ、金型10内に配設した温度測定プローブを加硫済タイヤから抜き取る。その結果、タイヤ毎に加硫終点を見極め、加硫時間を短縮しつつ空気入りタイヤを製造することができる。 After the vulcanization step is completed, the temperature measuring probe arranged in the mold 10 is pulled out from the vulcanized tire while the mold 10 is opened. As a result, it is possible to identify the vulcanization end point for each tire and manufacture a pneumatic tire while shortening the vulcanization time.

本発明は上述した実施形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の改良変更が可能である。 The present invention is not limited to the above-described embodiment, and various improvements and changes can be made without departing from the spirit of the present invention.

Claims (7)

一対のビード部と、前記ビード部の各々からタイヤ径方向外側に延びるサイドウォール部と、前記サイドウォール部の各々のタイヤ径方向外側端に連なって踏面を構成するトレッド部とを備えた未加硫の生タイヤを加硫するタイヤ成型用金型であって、
前記トレッド部に圧接可能なトレッド型部を少なくとも備え、
前記トレッド型部は、周方向に分割されて、前記生タイヤの径方向に移動可能な複数のセグメントを有し、
前記セグメントの少なくとも一つは、温度測定プローブの外周面側端を固定する固定手段と、前記固定手段から内周面側に向かって延びる温度測定プローブ挿入穴と、前記固定手段により外周面側端が固定され、前記温度測定プローブ挿入穴内を内周面側に向かって延び、内周面側端が前記温度測定プローブ挿入穴の内周面側端を超えて前記トレッド部のショルダー部内に埋設可能な姿勢で取り付けられた温度測定プローブとを備え、
前記温度測定プローブ挿入穴の内周面側側面に形成された凸部と前記温度測定プローブ表面とが接触することにより、前記温度測定プローブが固定されていることを特徴とするタイヤ成型用金型。
A pair of bead portions, a sidewall portion extending outward in the tire radial direction from each of the bead portions, and a tread portion connected to each tire radial outer end of the sidewall portion to form a tread surface are not added. A tire molding mold for vulcanizing raw vulcanized tires.
At least a tread mold portion that can be pressure-welded to the tread portion is provided.
The tread mold portion is divided in the circumferential direction and has a plurality of segments that are movable in the radial direction of the raw tire.
At least one of the segments is a fixing means for fixing the outer peripheral surface side end of the temperature measuring probe, a temperature measuring probe insertion hole extending from the fixing means toward the inner peripheral surface side, and an outer peripheral surface side end by the fixing means. Is fixed, extends in the temperature measurement probe insertion hole toward the inner peripheral surface side, and the inner peripheral surface side end can be embedded in the shoulder portion of the tread portion beyond the inner peripheral surface side end of the temperature measurement probe insertion hole. Equipped with a temperature measuring probe mounted in a proper posture,
A tire molding die characterized in that the temperature measuring probe is fixed by contacting the convex portion formed on the inner peripheral surface side side surface of the temperature measuring probe insertion hole with the surface of the temperature measuring probe. ..
前記凸部が、前記温度測定プローブ挿入穴の内周面側側面に形成された雄ネジ部であり、前記雄ネジ部の頂部と前記温度測定プローブ表面とが接触することにより、前記温度測定プローブが固定されている請求項1に記載のタイヤ成型用金型。 The convex portion is a male screw portion formed on the inner peripheral surface side side surface of the temperature measurement probe insertion hole, and the temperature measurement probe is formed by contacting the top of the male screw portion with the surface of the temperature measurement probe. The tire molding die according to claim 1, wherein is fixed. 前記凸部が、前記温度測定プローブ挿入穴の内周面側端から深さ方向にL1の範囲に形成されており、前記温度測定プローブ挿入穴の内周面側端から外周面側端までの前記温度測定プローブ挿入穴の深さLに対し、0.02≦L1/L≦0.05である請求項1または2に記載のタイヤ成型用金型。 The convex portion is formed in the range of L1 in the depth direction from the inner peripheral surface side end of the temperature measurement probe insertion hole, and extends from the inner peripheral surface side end to the outer peripheral surface side end of the temperature measurement probe insertion hole. The tire molding die according to claim 1 or 2, wherein 0.02 ≦ L1 / L ≦ 0.05 with respect to the depth L of the temperature measuring probe insertion hole. 前記L1の長さが少なくとも5mm以上である請求項3に記載のタイヤ成型用金型。 The tire molding die according to claim 3, wherein the length of L1 is at least 5 mm or more. 前記温度測定プローブの外径が1〜10mmである請求項1〜4のいずれかに記載のタイヤ成型用金型。 The tire molding die according to any one of claims 1 to 4, wherein the temperature measuring probe has an outer diameter of 1 to 10 mm. 前記温度測定プローブが、プラチナ測温抵抗体である請求項1〜5のいずれかに記載のタイヤ成型用金型。 The tire molding die according to any one of claims 1 to 5, wherein the temperature measuring probe is a platinum resistance temperature detector. 請求項1〜6のいずれかに記載のタイヤ成型用金型内で加硫する加硫工程を含む空気入りタイヤの製造方法であって、
前記加硫工程が、一対のビード部と、前記ビード部の各々からタイヤ径方向外側に延びるサイドウォール部と、前記サイドウォール部の各々のタイヤ径方向外側端に連なって踏面を構成するトレッド部とを備えた未加硫の生タイヤのトレッド部に含まれるショルダー部に温度測定プローブを埋設することにより、前記ショルダー部の温度を測定する工程を含むことを特徴とする空気入りタイヤの製造方法。
A method for manufacturing a pneumatic tire, which comprises a vulcanization step of vulcanizing in the tire molding die according to any one of claims 1 to 6.
The tread portion in which the vulcanization step is connected to a pair of bead portions, a sidewall portion extending outward in the tire radial direction from each of the bead portions, and each tire radial outer end of the sidewall portion to form a tread surface. A method for manufacturing a pneumatic tire, which comprises a step of measuring the temperature of the shoulder portion by embedding a temperature measuring probe in the shoulder portion included in the tread portion of the unvulcanized raw tire provided with the above. ..
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