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JP4156871B2 - Tire member molding apparatus and molding method - Google Patents
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JP4156871B2 - Tire member molding apparatus and molding method - Google Patents

Tire member molding apparatus and molding method Download PDF

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Publication number
JP4156871B2
JP4156871B2 JP2002180103A JP2002180103A JP4156871B2 JP 4156871 B2 JP4156871 B2 JP 4156871B2 JP 2002180103 A JP2002180103 A JP 2002180103A JP 2002180103 A JP2002180103 A JP 2002180103A JP 4156871 B2 JP4156871 B2 JP 4156871B2
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Japan
Prior art keywords
strip
speed
rotating body
strip supply
roll
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JP2002180103A
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Japanese (ja)
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JP2004017621A (en
Inventor
克人 小山
周平 飯塚
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Bridgestone Corp
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Bridgestone Corp
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Priority to JP2002180103A priority Critical patent/JP4156871B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/58Applying bands of rubber treads, i.e. applying camel backs
    • B29D30/62Applying bands of rubber treads, i.e. applying camel backs by extrusion or injection of the tread on carcass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08Building tyres
    • B29D30/20Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30Applying the layers; Guiding or stretching the layers during application
    • B29D30/3028Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)

Description

【0001】
【発明の属する技術分野】
この発明は、特に貼付け開始時を含む貼付け初期や、貼付け終了時を含む貼付け末期のように、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の速度バランスが安定しにくい非定常状態における、ストリップの破断や余分なゴムの吐出等の不具合の発生を有効に抑制したタイヤ部材の成型装置及び成型方法に関するものである。
【0002】
【従来の技術】
近年、タイヤ成型工程での拡径変形をできるだけ小さくしてユニフォミティ等の製品タイヤの品質を向上させるため、インナーライナー、ビードフィラー、サイドゴム、トレッドゴム等のタイヤ部材を個別に準備することなく、製品タイヤの内面形状と近似した外面形状を有する剛体コアの上にリボン状ストリップをロールで押圧しながららせん状に複数周回巻回して所定のタイヤ部材の形状が得られるまで積層し、生タイヤを形成し、この生タイヤを剛体コアとともに、加硫成型することによってタイヤを製造する、いわゆるコア成型法が提案されている。
【0003】
コア成型法において剛体コアにリボン状ストリップを貼り付ける場合、回転体、例えば剛体コアの回転速度、ストリップ供給手段、例えば押出し機のストリップ供給速度、及びロールの回転速度をそれぞれ制御する必要があるが、従来は、これらの速度を、貼付け開始時から貼付け終了時にわたる全貼付け期間において、一定の速度バランスで制御するのが一般的であった。
【0004】
しかしながら、剛体コアの回転速度、押出し機のストリップ供給速度及びロールの回転速度を一定の速度バランスで制御するように設定した場合であっても、それぞれの駆動手段、例えばモータの性能、特に加速時(モータ作動時)や減速時(モータ停止時)の応答速度(感度)が異なることが多いため、実際には、貼付け開始時を含む貼付け初期や、貼付け終了時を含む貼付け末期のような場合のような非定常状態では、剛体コアの回転速度、押出し機のストリップ供給速度及びロールの回転速度の速度バランスが崩れている場合が多く、かかる場合には、ストリップを回転体の外面上に適正な貼付けが行ないおそれがあった。
【0005】
特に、貼付け効率の向上等のため、高速にて剛体コアの外面上にリボン状ストリップの貼付けを行った場合、貼付け開始時を含む貼付け初期には、押出し機から押出されるリボン状ストリップの押出し速度が、そのストリップを貼り付ける回転体の回転速度に対する速度バランスの値よりもかなり遅くなりがちであるため、押出し機の口金から押し出されたリボン状ストリップが口金と貼付ロール間で破断が発生することがあり、また、貼付け終了時を含む貼付け末期のようにリボン状ストリップの貼付けを急停止すると、押出し機から押出されるリボン状ストリップの押出し速度が、そのストリップを貼り付ける回転体の回転速度に対する速度バランスの値よりもかなり速くなりがちであるため、押出し機のヘッド内の残圧により余分なゴムが吐出されやすく、かかる余分なゴムを別途手作業等で取り除く必要がある等の種々の不具合が生じた。
【0006】
【発明が解決しようとする課題】
この発明の目的は、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の速度バランスの適正化を図ることにより、特に貼付け開始時を含む貼付け初期及び貼付け終了時を含む貼付け末期のように、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が安定しにくい非定常状態における、ストリップの破断や余分なゴムの吐出等の不具合の発生を有効に抑制したタイヤ部材の成型装置及び成型方法を提供することにある。
【0007】
【課題を解決するための手段】
上記目的を達成するため、この発明のタイヤ部材の成型装置は、円筒状又はトロイド状の外面をもつ回転体と、該回転体に対しリボン状ストリップを供給するストリップ供給手段と、回転体に対向して位置し、ストリップ供給手段から供給された前記ストリップを回転体に向かって搬送し、かつ回転体の外面上に前記ストリップを押圧しながららせん状に貼り付ける一対のロールと、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御する速度制御手段とを具えるタイヤ部材の成型装置において、速度制御手段は、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出し、前記非定常状態でストリップを貼り付ける間、この算出した結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御することにある。
【0008】
尚、ここでいう「非定常状態であるストリップ貼付け期間」は、貼付け開始時を含む貼付け初期及び貼付け終了時を含む貼付け末期のうちの少なくとも一の期間を意味する。
【0009】
また、速度制御手段は、非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出する演算手段と、演算手段によって算出した結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を適正に制御するコントローラとを有することが好ましい。
【0010】
さらに、速度制御手段は、回転体の回転速度をV1、ストリップ供給手段のストリップ供給速度をV2、及びロールの回転速度をV3とするとき、貼付け開始時を含む貼付け初期にて、V1=V3でかつV2/V3比が漸減する関係を満たす加速パターンで制御すること、及び/又は、貼付け終了時を含む貼付け末期にて、V1=V3でかつV3>V2の関係を満たす減速パターンで制御することが好ましい。特に、貼付け開始時を含む貼付け初期では、V2/V3比を、1から定常状態の適正なV2/V3比へ漸減するように設定して、前記ストリップに適正なテンションをかけながら回転体の外面上に貼り付けることが好ましい。尚、定常状態の適正なV2/V3比は、貼り付けるリボン状ストリップの種類(例えばストリップの寸法、ゴム質、押出し機のゴム吐出温度等)によっても異なるが、0.3〜0.7の範囲であることが好適である。
【0011】
この発明のタイヤ部材の成型方法は、速度制御手段によって、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御しながら、ストリップ供給手段から一対のロールを介して回転体上にリボン状ストリップを搬送し、回転体の外面上にロールでストリップを押圧しながららせん状に貼り付けるタイヤ部材の成型方法において、速度制御手段は、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出し、前記非定常状態でストリップを貼り付ける間、この算出した結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御することにある。
【0012】
また、速度制御手段は、演算手段とコントローラを有し、演算手段が非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出し、算出した結果をコントローラに転送し、コントローラが、転送された算出結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御することが好ましい。
【0013】
【発明の実施の形態】
以下、この発明の実施の形態の一例を図面を参照しながら詳細に説明する。
図1は、この発明に従うタイヤ部材の成型装置1の一例を示したものである。
【0014】
図1に示すタイヤ部材の成型装置1は、回転体2、ストリップ供給手段3、一対のロール4a、4b、及び速度制御手段5とで主に構成されている。図2は、回転体2、ストリップ供給手段3および一対のロール4a、4bの位置関係およびリボン状ゴムストリップの貼付け状態を説明するために示したものである。
【0015】
回転体2は、円筒状又はトロイド状の外面をもち、図1ではハードコア製法の例として剛体コアである場合を示してあるが、生ケース、生タイヤ、ブラダー、成型ドラム等のように、円筒状又はトロイド状の外面をもつ回転体であればよく、特に限定はしない。
【0016】
ストリップ供給手段3は、該回転体2に対しリボン状ゴムストリップ6を供給するためのものであり、図1では、口金3aから所定の断面形状のゴムを押出すことによってリボン状ストリップ6を供給する押出し機3、特にスクリューモータ制御タイプの押出し機である場合を示してあるが、ピストン送りスピード制御タイプの押出し機や、スクリューとギヤモータ制御タイプの押出し機でもよく、特に限定はしない。例えば、予め作製したリボン状ストリップをらせん状に複数周回螺旋巻回してコイル状部材としてこのコイル状部材からリボン状ストリップを供給してもよい。
【0017】
一対のロール4a、4bは、回転体2に対向して位置し、ストリップ供給手段3から供給された前記ストリップ6を回転体2に向かって搬送するとともに、これらのロール4a、4bのうちのいずれか1本のロール4aは、回転体2の外面上に前記ストリップ6を押圧しながららせん状に貼り付けるように配設する。
【0018】
速度制御手段5は、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3を制御する。
【0019】
尚、回転体2の回転、ストリップ供給手段3のストリップ供給、及びロール4a、4bの回転させる方法としては、回転体2、ストリップ供給手段3及びロール4a、4bのそれぞれに接続した駆動手段、例えば電動モータを用いればよい。
【0020】
この発明の構成上の主な特徴は、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3の速度バランスの適正化を図ることにあり、より具体的には、速度制御手段5は、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3が非定常状態であるストリップ貼付け期間、例えば、貼付け開始時を含む貼付け初期及び貼付け終了時を含む貼付け末期のうちの少なくとも一の期間にて、ストリップ6を適正に貼り付けることができたときの、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3の経時的変化をそれぞれ算出し、前記非定常状態でストリップ6を貼り付ける間、この算出した結果に基づいて、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3を制御することにある。
【0021】
そして、上記構成を採用することにより、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が安定しにくい上記非定常状態における、ストリップの破断や余分なゴムの吐出等の不具合の発生を有効に抑制することができる。
【0022】
また、速度制御手段5は、演算手段7とコントローラ8とで主に構成されている。
【0023】
演算手段7は、例えば図1に示すようなコンピューターは、非定常状態であるストリップ貼付け期間にて、ストリップ6を適正に貼り付けることができたときの、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3の経時的変化をそれぞれ算出する。
【0024】
コントローラー8は、演算手段7と、演算手段7によって算出した結果に基づいて、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3を適正に制御する。尚、図1では、回転体2、ストリップ供給手段3及びロール4a、4bのそれぞれにコントローラー8a、8b、8cを独立して設けた場合を示してあるが、1台のコントローラーだけで、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3を制御してもよい。
【0025】
速度制御手段5は、回転体の回転速度V1、ストリップ供給手段のストリップ供給速度V2及びロールの回転速度V3を所定の速度バランスになるように制御するが、速度バランスが定まらない非定常状態である貼付け開始時を含む貼付け初期における制御を、V1=V3でかつV2/V3比が漸減する関係を満たす加速パターンで行えば、押出し機の口金から押し出されたリボン状ストリップが口金と貼付ロール間で破断するのを有効に防止することができる。
【0026】
図3は、貼付け開始時を含む貼付け初期を、V1=V3でかつV2/V3比が1から漸減する関係を満たす加速パターンで制御した場合のモータ回転数の経時的変化の一例を示したものである。
【0027】
また、速度制御手段5は、速度バランスが定まらない非定常状態である貼付け終了時を含む貼付け末期における制御を、V1=V3でかつV3>V2の関係を満たす減速パターンで行えば、押出し機のヘッド内の圧力を十分に下げることができるので、余分なゴムが吐出されるのを有効に防止することができる。
【0028】
図4は、貼付け終了時を含む貼付け末期を、V1=V3でかつV3>V2の関係を満たす減速パターンで制御した場合のモータ回転数の経時的変化の一例を示したものである。
【0029】
尚、加速パターンや減速パターン等の算出方法は、ダイヤグラムから求めても、或いは、式によって求めてもよい。また、これらのパターンは、貼り付けるリボン状ストリップの種類(例えばストリップの寸法、ゴム質、押出し機のゴム吐出温度等)に応じて設定することができる。さらに、これらのパターンは、駆動手段、例えば電動モータの能力や、回転体の慣性力にて変更してもよい。
【0030】
次に、この発明のタイヤ部材の成型方法の一例を以下で説明する。
まず、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3を制御するため、速度制御手段5を構成する算出手段であるコンピューター7によって、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3が非定常状態であるストリップ貼付け期間にて、ストリップ6を適正に貼り付けることができたときの、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3の経時的変化をそれぞれ算出する。
【0031】
次いで、コンピューター7によって算出した結果をコントローラ8a〜8cに転送し、コントローラ8a〜8cが、転送された算出結果に基づいて、、回転体2の回転速度V1、ストリップ供給手段3のストリップ供給速度V2及びロール4a、4bの回転速度V3を制御しながら、ストリップ供給手段3から一対のロール4a、4bを介して回転体2上にリボン状ストリップ6を搬送し、回転体2の外面上にロール4aでストリップを押圧しながららせん状に貼り付けることによって、タイヤ部材を成型することができる。
【0032】
そして、この発明に従う成型方法によってタイヤ部材を成型すれば、貼付け開始時を含む貼付け初期におけるストリップの破断の発生が皆無になり、また、貼付け終了時を含む貼付け末期における余分なゴムの吐出量を、従来の速度制御を行った従来の成型方法に比べて50%程度減少させることができる。
【0033】
上述したところは、この発明の実施形態の一例を示したにすぎず、請求の範囲において種々の変更を加えることができる。
【0034】
【発明の効果】
この発明によれば、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の速度バランスの適正化を図ることにより、特に貼付け開始時を含む貼付け初期及び貼付け終了時を含む貼付け末期のように、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が安定しにくい非定常状態における、ストリップの破断や余分なゴムの吐出等の不具合の発生を有効に抑制したタイヤ部材の成型装置及び成型方法の提供が可能になった。
【図面の簡単な説明】
【図1】 この発明に従うタイヤ部材の成型装置の一例を示す概略図である。
【図2】 図1に示す回転体、ストリップ供給手段及びロールの位置関係とリボン状ストリップの貼付け状態を説明するための概略側面図である。
【図3】 貼付け開始時を含む貼付け初期を、V1=V3でかつV2/V3比が1から漸減する関係を満たす加速パターンで制御した場合のモータ回転数の経時的変化の一例を示した図である。
【図4】 貼付け終了時を含む貼付け末期を、V1=V3でかつV3>V2の関係を満たす減速パターンで制御した場合のモータ回転数の経時的変化の一例を示した図である。
【符号の説明】
1 タイヤ部材の成型装置
2 回転体(又は剛体コア)
3 リボン状ストリップの供給装置(又は押出機)
4a,4b ロール
5 速度制御手段
6 リボン状ストリップ
7 コンピューター
8,8a,8b,8c コントローラ
[0001]
BACKGROUND OF THE INVENTION
In the present invention, the rotational balance of the rotating body, the strip supply speed of the strip supply means, and the rotational speed of the roll are difficult to stabilize, particularly at the initial stage of application including the start of application and at the end of application including the end of application. The present invention relates to a molding apparatus and a molding method for a tire member that effectively suppresses occurrence of defects such as strip breakage and excessive rubber discharge in an unsteady state.
[0002]
[Prior art]
In recent years, in order to improve the quality of product tires such as uniformity by reducing the diameter expansion deformation in the tire molding process as much as possible, without preparing tire members such as inner liner, bead filler, side rubber, tread rubber separately Form a raw tire by laminating a ribbon-shaped strip on a rigid core having an outer surface shape similar to the inner surface shape of the tire while winding it in a spiral while pressing it with a roll until a predetermined tire member shape is obtained. A so-called core molding method has been proposed in which a tire is manufactured by vulcanizing and molding this raw tire together with a rigid core.
[0003]
When a ribbon-like strip is affixed to a rigid core in the core molding method, it is necessary to control the rotation speed of a rotating body, for example, a rigid core, the strip supply means, for example, the strip supply speed of an extruder, and the rotation speed of a roll. Conventionally, it has been common to control these speeds with a constant speed balance in the entire application period from the start of application to the end of application.
[0004]
However, even when the rotational speed of the rigid core, the strip feeding speed of the extruder, and the rotational speed of the roll are set to be controlled with a constant speed balance, the performance of each driving means, for example, the motor performance, particularly during acceleration. In many cases, the response speed (sensitivity) at the time of motor operation or deceleration (motor stop) is different, so in actual cases, such as the initial stage of application including the start of application or the end of application including the end of application. In such unsteady state, the balance of the rotational speed of the rigid core, the strip feeding speed of the extruder, and the rotational speed of the roll is often out of order. In such a case, the strip is properly placed on the outer surface of the rotating body. there is a possibility that not help do not sticking injuries row.
[0005]
In particular, when ribbon-like strips are applied to the outer surface of the rigid core at high speed to improve application efficiency, ribbon-like strips extruded from the extruder at the initial stage of application, including the beginning of application. Since the speed tends to be much slower than the value of the speed balance with respect to the rotational speed of the rotating body to which the strip is applied, the ribbon-like strip extruded from the extruder die breaks between the die and the application roll. In addition, when the application of the ribbon strip is stopped suddenly as in the final stage of application including the end of application, the extrusion speed of the ribbon strip extruded from the extruder is the rotational speed of the rotating body that applies the strip. Tends to be much faster than the value of the speed balance for the residual pressure in the extruder head. Is easily discharged, such excess rubber defect separate various like that need to be removed by hand or the like occurs.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to apply a speed balance of a rotating body, a strip supply speed of a strip supply means, and a rotation speed of a roll to optimize the speed balance, particularly including the initial stage of application including the start of application and the end of application. Effectively suppresses the occurrence of defects such as strip breakage and excess rubber discharge in the unsteady state where the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll are difficult to stabilize as in the last stage. An object of the present invention is to provide a molding apparatus and a molding method for a tire member.
[0007]
[Means for Solving the Problems]
To achieve the above object, a tire member molding apparatus according to the present invention includes a rotating body having a cylindrical or toroidal outer surface, strip supply means for supplying a ribbon-like strip to the rotating body, and a rotating body facing the rotating body. A pair of rolls, which conveys the strip supplied from the strip supply means toward the rotating body and affixes the strip on the outer surface of the rotating body in a spiral shape, and rotation of the rotating body And a speed control means for controlling the rotation speed of the roll, and the speed control means for controlling the rotation speed of the rotating body, the strip supply speed of the strip supply means, When the strip can be properly pasted during the strip pasting period when the rotation speed of the roll is in an unsteady state, The time-dependent changes in the rotation speed of the rolling element, the strip supply speed of the strip supply means, and the rotation speed of the roll are calculated, and during the pasting of the strip in the unsteady state, the rotation of the rotating body is calculated based on the calculated results. It is to control the speed, the strip supply speed of the strip supply means and the rotation speed of the roll.
[0008]
The “unsteady strip application period” means at least one of the initial application period including the start of application and the final application period including the end of application.
[0009]
Further, the speed control means is configured to control the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll when the strip can be properly applied in the non-steady state of the strip application period. And a controller for appropriately calculating the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll based on the result calculated by the calculation means. preferable.
[0010]
Further, the speed control means has V1 = V3 at the initial stage of application including the start of application, where the rotation speed of the rotating body is V1, the strip supply speed of the strip supply means is V2, and the rotation speed of the roll is V3. And controlling with an acceleration pattern that satisfies the relationship of gradually decreasing the V2 / V3 ratio, and / or controlling with a deceleration pattern that satisfies the relationship of V1 = V3 and V3> V2 at the end of application including the end of application. Is preferred. In particular, at the initial stage of pasting, including at the beginning of pasting, the V2 / V3 ratio is set so as to gradually decrease from 1 to an appropriate V2 / V3 ratio in a steady state, and the outer surface of the rotating body is applied while applying appropriate tension to the strip. It is preferable to stick on top. The proper V2 / V3 ratio in the steady state varies depending on the type of ribbon-shaped strip to be attached (for example, strip size, rubber quality, rubber discharge temperature of the extruder, etc.), but is in the range of 0.3 to 0.7. Is preferred.
[0011]
In the tire member molding method according to the present invention, the speed control means controls the rotation speed of the rotary body, the strip supply speed of the strip supply means, and the rotation speed of the roll, while the rotary body from the strip supply means via the pair of rolls. In the method of molding a tire member that conveys a ribbon-like strip onto the outer surface of the rotating body and affixes the strip in a spiral shape while pressing the strip with a roll, the speed control means includes the rotational speed of the rotating body, the strip of the strip supply means The rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll when the strip can be properly applied in the strip application period in which the supply speed and the rotation speed of the roll are in an unsteady state Change over time, and while applying the strip in the unsteady state, this calculation Was based on the results, the rotational speed of the rotating body is to control the strip feed rate and the rotational speed of the rolls of the strip feed means.
[0012]
Further, the speed control means has a calculation means and a controller, and the rotation speed of the rotating body and the strip supply when the strip can be properly applied in the strip application period in which the calculation means is in an unsteady state. The time-dependent changes in the strip supply speed of the means and the rotation speed of the roll are calculated, and the calculated results are transferred to the controller. The controller, based on the transferred calculation results, determines the rotation speed of the rotating body and the strip supply means. It is preferable to control the strip feeding speed and the rotation speed of the roll.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of a tire member molding apparatus 1 according to the present invention.
[0014]
A tire member molding apparatus 1 shown in FIG. 1 mainly includes a rotating body 2, a strip supply means 3, a pair of rolls 4a and 4b, and a speed control means 5. FIG. 2 shows the positional relationship between the rotating body 2, the strip supply means 3, and the pair of rolls 4a and 4b and the state of the ribbon-like rubber strip being attached.
[0015]
The rotating body 2 has a cylindrical or toroidal outer surface, and FIG. 1 shows a case of a rigid core as an example of a hard core manufacturing method. However, the rotating body 2 is a cylinder like a raw case, a raw tire, a bladder, a molding drum, or the like. There is no particular limitation as long as it is a rotating body having a toroidal or toroidal outer surface.
[0016]
The strip supply means 3 is for supplying the ribbon-shaped rubber strip 6 to the rotating body 2. In FIG. 1, the ribbon-shaped strip 6 is supplied by extruding rubber having a predetermined cross-sectional shape from the base 3a. Although the case where the extruder 3 is a screw motor control type extruder is shown, a piston feed speed control type extruder or a screw and gear motor control type extruder may be used, and there is no particular limitation. For example, a ribbon-shaped strip prepared in advance may be spirally wound around a plurality of turns and supplied as a coil-shaped member from the coil-shaped member.
[0017]
The pair of rolls 4a and 4b are positioned to face the rotating body 2, convey the strip 6 supplied from the strip supply means 3 toward the rotating body 2, and any of these rolls 4a and 4b. The single roll 4a is disposed on the outer surface of the rotating body 2 so that the strip 6 is pressed in a spiral shape while pressing.
[0018]
The speed control means 5 controls the rotation speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply means 3, and the rotation speed V3 of the rolls 4a and 4b.
[0019]
In addition, as a method of rotating the rotating body 2, strip supplying of the strip supplying means 3, and rotating the rolls 4a and 4b, driving means connected to each of the rotating body 2, the strip supplying means 3 and the rolls 4a and 4b, for example, An electric motor may be used.
[0020]
The main feature of the structure of the present invention is to optimize the speed balance of the rotational speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply means 3, and the rotational speed V3 of the rolls 4a and 4b. Specifically, the speed control means 5 is a strip application period in which the rotation speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply means 3, and the rotation speed V3 of the rolls 4a and 4b are in an unsteady state, for example, application The rotation speed V1 of the rotating body 2 and the strip supply means 3 when the strip 6 can be properly applied in at least one period of the initial stage of application including the start and the final stage of application including the end of application. The time-dependent changes in the strip supply speed V2 and the rotation speed V3 of the rolls 4a and 4b are calculated, and this calculation is performed while the strip 6 is applied in the unsteady state. Was based on the results, the rotation speed V1 of the rotary member 2, the strip feed speed V2 and roll 4a of the strip supply means 3 is to control the rotational speed V3 of 4b.
[0021]
And, by adopting the above configuration, it is difficult to stabilize the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll. Can be effectively suppressed.
[0022]
The speed control means 5 is mainly composed of a calculation means 7 and a controller 8.
[0023]
The computing means 7 is, for example, a computer as shown in FIG. 1, when the strip 6 can be properly applied in the non-steady state of the strip application period, the rotational speed V1 of the rotating body 2 and the strip supply. The time-dependent changes in the strip supply speed V2 of the means 3 and the rotation speed V3 of the rolls 4a and 4b are calculated.
[0024]
Based on the calculation means 7 and the result calculated by the calculation means 7, the controller 8 appropriately controls the rotation speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply means 3, and the rotation speed V3 of the rolls 4a and 4b. To do. FIG. 1 shows the case where the controller 8a, 8b, 8c is provided independently for each of the rotating body 2, the strip supply means 3 and the rolls 4a, 4b. The rotational speed V1 of 2, the strip supply speed V2 of the strip supply means 3, and the rotational speed V3 of the rolls 4a and 4b may be controlled.
[0025]
The speed control means 5 controls the rotation speed V1 of the rotating body, the strip supply speed V2 of the strip supply means and the rotation speed V3 of the roll so as to achieve a predetermined speed balance, but is in an unsteady state where the speed balance is not determined. If the control at the initial stage of application including the start of application is performed with an acceleration pattern that satisfies the relationship of V1 = V3 and the V2 / V3 ratio gradually decreasing, the ribbon-like strip extruded from the die of the extruder is between the die and the application roll. It is possible to effectively prevent breakage.
[0026]
FIG. 3 shows an example of the change over time of the motor rotation speed when the initial stage of application including the start of application is controlled with an acceleration pattern that satisfies the relationship of V1 = V3 and the V2 / V3 ratio gradually decreasing from 1. It is.
[0027]
Moreover, if the speed control means 5 performs the control in the pasting stage including the end of the pasting which is a non-steady state where the speed balance is not determined, with a deceleration pattern satisfying the relationship of V1 = V3 and V3> V2, the speed control means 5 Since the pressure in the head can be sufficiently reduced, it is possible to effectively prevent the excess rubber from being discharged.
[0028]
FIG. 4 shows an example of the change over time of the motor rotational speed when the last stage of pasting including the end of pasting is controlled with a deceleration pattern satisfying the relationship of V1 = V3 and V3> V2.
[0029]
In addition, the calculation method of an acceleration pattern, a deceleration pattern, etc. may be calculated | required from a diagram, or may be calculated | required by a type | formula. Further, these patterns can be set according to the type of ribbon-like strip to be attached (for example, strip size, rubber quality, rubber discharge temperature of an extruder, etc.). Furthermore, these patterns may be changed by the capability of the driving means, for example, the electric motor or the inertial force of the rotating body.
[0030]
Next, an example of a method for molding a tire member according to the present invention will be described below.
First, in order to control the rotational speed V1 of the rotary body 2, the strip supply speed V2 of the strip supply means 3, and the rotational speed V3 of the rolls 4a and 4b, the rotational body is obtained by a computer 7 which is a calculation means constituting the speed control means 5. When the strip 6 can be properly applied in the strip application period in which the rotational speed V1 of 2, the strip supply speed V2 of the strip supply means 3, and the rotational speed V3 of the rolls 4a and 4b are in an unsteady state, Changes over time of the rotational speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply means 3, and the rotational speed V3 of the rolls 4a and 4b are calculated.
[0031]
Next, the results calculated by the computer 7 are transferred to the controllers 8a to 8c, and the controllers 8a to 8c, based on the transferred calculation results, rotate the rotation speed V1 of the rotating body 2 and the strip supply speed V2 of the strip supply means 3. And while controlling the rotational speed V3 of the rolls 4a and 4b, the ribbon-like strip 6 is conveyed from the strip supply means 3 onto the rotary body 2 via the pair of rolls 4a and 4b, and the roll 4a is placed on the outer surface of the rotary body 2. The tire member can be molded by sticking in a spiral shape while pressing the strip.
[0032]
And, if the tire member is molded by the molding method according to the present invention, there will be no occurrence of strip breakage at the initial stage of application including the start of application, and the amount of excess rubber discharged at the end of application including the end of application will be reduced. Compared with the conventional molding method in which the conventional speed control is performed, it can be reduced by about 50%.
[0033]
The above description is merely an example of the embodiment of the present invention, and various modifications can be made within the scope of the claims.
[0034]
【The invention's effect】
According to this invention, by optimizing the speed balance of the rotational speed of the rotating body, the strip supply speed of the strip supply means, and the rotational speed of the roll, the pasting including the initial stage of pasting and the end of pasting, particularly at the start of pasting. Effectively suppresses the occurrence of defects such as strip breakage and excess rubber discharge in the unsteady state where the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll are difficult to stabilize as in the last stage. It has become possible to provide a molding apparatus and a molding method for a tire member.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a tire member molding apparatus according to the present invention.
FIG. 2 is a schematic side view for explaining the positional relationship between the rotating body, strip supply means, and roll shown in FIG.
FIG. 3 is a diagram showing an example of a change over time in the motor rotation speed when the initial stage of application including the start of application is controlled with an acceleration pattern satisfying the relationship where V1 = V3 and the V2 / V3 ratio gradually decreases from 1. It is.
FIG. 4 is a diagram showing an example of a change over time in the motor rotation speed when the last stage of pasting including the end of pasting is controlled with a deceleration pattern satisfying the relationship of V1 = V3 and V3> V2.
[Explanation of symbols]
1 Tire member molding device 2 Rotating body (or rigid core)
3 Ribbon strip feeder (or extruder)
4a, 4b Roll 5 Speed control means 6 Ribbon strip 7 Computer
8,8a, 8b, 8c controller

Claims (7)

円筒状又はトロイド状の外面をもつ回転体と、
該回転体に対しリボン状ストリップを供給するストリップ供給手段と、
回転体に対向して位置し、ストリップ供給手段から供給された前記ストリップを回転体に向かって搬送し、かつ回転体の外面上に前記ストリップを押圧しながららせん状に貼り付ける一対のロールと、
回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御する速度制御手段と、
を具えるタイヤ部材の成型装置において、
速度制御手段は、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出し、前記非定常状態でストリップを貼り付ける間、この算出した結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御することを特徴とするタイヤ部材の成型装置。
A rotating body having a cylindrical or toroidal outer surface;
Strip supply means for supplying a ribbon-like strip to the rotating body;
A pair of rolls positioned facing the rotating body, transporting the strip supplied from the strip supply means toward the rotating body, and affixing the strip spirally while pressing the strip on the outer surface of the rotating body;
Speed control means for controlling the rotation speed of the rotating body, the strip supply speed of the strip supply means and the rotation speed of the roll;
In a tire member molding apparatus comprising:
The speed control means is the rotating body when the strip can be properly applied in the strip application period in which the rotational speed of the rotating body, the strip supply speed of the strip supply means and the rotational speed of the roll are in an unsteady state. Of the rotation speed of the strip, the strip supply speed of the strip supply means, and the change in rotation speed of the roll over time, and while applying the strip in the unsteady state, based on the calculated results, An apparatus for molding a tire member, wherein a strip supply speed of a strip supply means and a rotational speed of a roll are controlled.
非定常状態であるストリップ貼付け期間は、貼付け開始時を含む貼付け初期及び貼付け終了時を含む貼付け末期のうちの少なくとも一の期間である請求項1記載のタイヤ部材の成形装置。  The apparatus for molding a tire member according to claim 1, wherein the strip sticking period in an unsteady state is at least one of a sticking initial stage including a sticking start time and a sticking end stage including a sticking end time. 速度制御手段は、非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出する演算手段と、演算手段によって算出した結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を適正に制御するコントローラとを有する請求項1又は2記載のタイヤ部材の成型装置。  The speed control means is a method of changing the rotational speed of the rotating body, the strip supply speed of the strip supply means, and the rotational speed of the roll over time when the strip can be properly applied in the strip application period in an unsteady state. The calculation means for calculating each change, and a controller for appropriately controlling the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll based on the result calculated by the calculation means. 2. The tire member molding apparatus according to 2. 円筒状又はトロイド状の外面をもつ回転体と、
該回転体に対しリボン状ストリップを供給するストリップ供給手段と、
回転体に対向して位置し、ストリップ供給手段から供給された前記ストリップを回転体に向かって搬送し、かつ回転体の外面上に前記ストリップを押圧しながららせん状に貼り付ける一対のロールと、
回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御する速度制御手段と、
を具えるタイヤ部材の成型装置において、
速度制御手段は、回転体の回転速度をV1、ストリップ供給手段のストリップ供給速度をV2、及びロールの回転速度をV3とするとき、貼付け開始時を含む貼付け初期にて、V1=V3でかつV2/V3比が漸減する関係を満たす加速パターンで制御することを特徴とするタイヤ部材の成型装置。
A rotating body having a cylindrical or toroidal outer surface;
Strip supply means for supplying a ribbon-like strip to the rotating body;
A pair of rolls positioned facing the rotating body, transporting the strip supplied from the strip supply means toward the rotating body, and affixing the strip spirally while pressing the strip on the outer surface of the rotating body;
Speed control means for controlling the rotation speed of the rotating body, the strip supply speed of the strip supply means and the rotation speed of the roll;
In a tire member molding apparatus comprising:
The speed control means has V1 = V3 and V2 at the initial stage of application, including the start of application, when the rotation speed of the rotating body is V1, the strip supply speed of the strip supply means is V2, and the rotation speed of the roll is V3. / V3 ratio molding apparatus of the tire member, characterized in that to control an acceleration pattern satisfying the relationship of decreasing.
円筒状又はトロイド状の外面をもつ回転体と、
該回転体に対しリボン状ストリップを供給するストリップ供給手段と、
回転体に対向して位置し、ストリップ供給手段から供給された前記ストリップを回転体に向かって搬送し、かつ回転体の外面上に前記ストリップを押圧しながららせん状に貼り付ける一対のロールと、
回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御する速度制御手段と、
を具えるタイヤ部材の成型装置において、
速度制御手段は、回転体の回転速度をV1、ストリップ供給手段のストリップ供給速度をV2、及びロールの回転速度をV3とするとき、貼付け終了時を含む貼付け末期にて、V1=V3でかつV3>V2の関係を満たす減速パターンで制御することを特徴とするタイヤ部材の成型装置。
A rotating body having a cylindrical or toroidal outer surface;
Strip supply means for supplying a ribbon-like strip to the rotating body;
A pair of rolls positioned facing the rotating body, transporting the strip supplied from the strip supply means toward the rotating body, and affixing the strip spirally while pressing the strip on the outer surface of the rotating body;
Speed control means for controlling the rotation speed of the rotating body, the strip supply speed of the strip supply means and the rotation speed of the roll;
In a tire member molding apparatus comprising:
The speed control means has V1 = V3 and V3 at the last stage of pasting including the end of pasting , where the rotational speed of the rotating body is V1, the strip feeding speed of the strip feeding means is V2, and the rotational speed of the roll is V3. A tire member molding apparatus, wherein the tire member is controlled with a deceleration pattern that satisfies a relationship of> V2.
速度制御手段によって、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御しながら、ストリップ供給手段から一対のロールを介して回転体上にリボン状ストリップを搬送し、回転体の外面上にロールでストリップを押圧しながららせん状に貼り付けるタイヤ部材の成型方法において、
速度制御手段は、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度が非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出し、前記非定常状態でストリップを貼り付ける間、この算出した結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御することを特徴とするタイヤ部材の成型方法。
While controlling the rotation speed of the rotating body, the strip supplying speed of the strip supplying means, and the rotating speed of the roll by the speed control means, the ribbon-like strip is conveyed from the strip supplying means onto the rotating body via the pair of rolls and rotated. In the molding method of the tire member that is affixed spirally while pressing the strip on the outer surface of the body,
The speed control means is the rotating body when the strip can be properly applied in the strip application period in which the rotational speed of the rotating body, the strip supply speed of the strip supply means and the rotational speed of the roll are in an unsteady state. Of the rotation speed of the strip, the strip supply speed of the strip supply means, and the change in rotation speed of the roll over time, and while applying the strip in the unsteady state, based on the calculated results, A method for molding a tire member, wherein the strip supply speed of the strip supply means and the rotational speed of the roll are controlled.
速度制御手段は、演算手段とコントローラを有し、演算手段が非定常状態であるストリップ貼付け期間にて、ストリップを適正に貼り付けることができたときの、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度の経時的変化をそれぞれ算出し、算出した結果をコントローラに転送し、コントローラが、転送された算出結果に基づいて、回転体の回転速度、ストリップ供給手段のストリップ供給速度及びロールの回転速度を制御する請求項6記載のタイヤ部材の成型方法。  The speed control means has a calculation means and a controller, and the rotation speed of the rotating body when the strip can be properly applied in the strip application period in which the calculation means is in an unsteady state, the strip supply means The time-dependent changes in the strip supply speed and the roll rotation speed are calculated, and the calculated results are transferred to the controller. Based on the transferred calculation results, the controller supplies the rotation speed of the rotating body and the strip supply of the strip supply means. The method for molding a tire member according to claim 6, wherein the speed and the rotational speed of the roll are controlled.
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