JP2004017621A - Apparatus and method for molding tire component - Google Patents

Apparatus and method for molding tire component Download PDF

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Publication number
JP2004017621A
JP2004017621A JP2002180103A JP2002180103A JP2004017621A JP 2004017621 A JP2004017621 A JP 2004017621A JP 2002180103 A JP2002180103 A JP 2002180103A JP 2002180103 A JP2002180103 A JP 2002180103A JP 2004017621 A JP2004017621 A JP 2004017621A
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Prior art keywords
strip
speed
rotation speed
rotating body
strip supply
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JP2002180103A
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JP4156871B2 (en
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Katsuto Koyama
小山　克人
Shuhei Iizuka
飯塚　周平
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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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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/58—Applying bands of rubber treads, i.e. applying camel backs
    • B29D30/62—Applying bands of rubber treads, i.e. applying camel backs by extrusion or injection of the tread on carcass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30—Applying the layers; Guiding or stretching the layers during application
    • B29D30/3028—Applying 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and the like for molding a tire component for suppressing occurrence of inconvenience such as breaking of a strip, discharge of excess rubber and the like in a non-stationary state wherein a rolling speed of a rotator, a strip supply speed of a strip supply means and a rolling speed of a roll are difficult to be stabilized. <P>SOLUTION: The apparatus comprises a rotator 2, a strip supply means 3, a pair of rolls 4a, 4b and a speed controlling means 5. The speed control means 5 calculates changes of respective speeds V1-V3 with time when the strip 6 is appropriately stuck in a time of sticking the strip wherein the rolling speed V1 of the rotator 2, a strip supply speed V2 of the strip supply means 3 and the rolling speed V3 of the rolls 4a, 4b are in a non-stationary state. While the strip 6 is stuck under the non-stationary state, the rolling speed V1 of the rotator 2, the strip supply speed V2 of the strip supply means 3 and the rolling speed V3 of the rolls 4a, 4b are controlled based on the calculated results. <P>COPYRIGHT: (C)2004,JPO

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わえ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]
TECHNICAL FIELD OF THE INVENTION
This invention is particularly difficult to stabilize the rotational speed of the rotating body, the strip supply speed of the strip supply means, and the rotational speed of the roll, as in the initial stage of the application including the start of application and at the end of the application including the end of application. The present invention relates to an apparatus and a method for molding a tire member in which occurrence of problems such as breakage of a strip and ejection of extra rubber in an unsteady state is effectively suppressed.
[0002]
[Prior art]
In recent years, in order to improve the quality of product tires such as uniformity by minimizing the expansion deformation in the tire molding process as much as possible, without separately preparing tire members such as inner liner, bead filler, side rubber, tread rubber, product Rolling a ribbon-shaped strip onto a rigid core having an outer surface shape similar to the inner surface shape of the tire while rolling it in a spiral while laminating a plurality of layers until a predetermined tire member shape is obtained, forming a raw tire A so-called core molding method has been proposed in which a tire is manufactured by vulcanizing and molding this green tire together with a rigid core.
[0003]
When attaching a ribbon-like strip 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, these speeds are generally controlled at a constant speed balance during the entire pasting period from the start of pasting to the end of pasting.
[0004]
However, even when the rotation speed of the rigid core, the strip feeding speed of the extruder, and the rotation speed of the roll are set to be controlled with a constant speed balance, the respective driving means, for example, the performance of the motor, especially during acceleration, In many cases, the response speed (sensitivity) during (motor operation) and deceleration (motor stop) is different, so in actual cases such as the initial stage including the start of pasting and the final stage including the end of pasting In an unsteady state such as that described above, the rotational speed of the rigid core, the strip feed speed of the extruder, and the rotational speed of the roll are often out of balance, and in such a case, the strip is properly placed on the outer surface of the rotary body. There was a possibility that aggressive attachment could not be performed.
[0005]
In particular, when the ribbon-like strip is pasted on the outer surface of the rigid core at a high speed in order to improve the pasting efficiency, etc., the ribbon-like strip extruded from the extruder should be extruded at the initial stage of the pasting, including at the start of the pasting. Since the speed tends to be considerably lower than the value of the speed balance with respect to the rotation speed of the rotating body to which the strip is attached, the ribbon-like strip extruded from the die of the extruder breaks between the die and the application roll. In some cases, when the application of the ribbon-like strip is suddenly stopped, such as at the end of application including the end of application, the extrusion speed of the ribbon-like strip extruded from the extruder increases the rotation speed of the rotating body to which the strip is applied. The residual pressure in the extruder head tends to be 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]
It is an object of the present invention to optimize the speed balance between the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the roll, and particularly to the pasting including the start of the pasting and the end of the pasting. As in the last stage, 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, it is possible to effectively suppress the occurrence of troubles such as strip breakage and excessive rubber discharge. It is an object of the present invention to provide an apparatus and method for molding a tire member.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a tire member forming apparatus according to the present invention includes a rotating body having a cylindrical or toroidal outer surface, a strip supply means for supplying a ribbon-like strip to the rotating body, and a rotating body facing the rotating body. And a pair of rolls for transporting the strip supplied from the strip supply means toward the rotating body, and pressing the strip on the outer surface of the rotating body in a spiral manner, and rotating the rotating body. Speed, a speed control means for controlling the strip supply speed of the strip supply means and the rotation speed of the roll, the speed control means, the rotation speed of the rotating body, the strip supply speed of the strip supply means and When the strip could be properly affixed during the strip affixing period when the roll rotation speed was in an unsteady state, The change over time of the rotation speed of the rolling member, the strip supply speed of the strip supply means, and the rotation speed of the roll are calculated, and the rotation of the rotation member is performed based on the calculated result while the strip is attached in the unsteady state. The purpose of the present invention is to control the speed, the strip feeding speed of the strip feeding means, and the rotation speed of the roll.
[0008]
Here, the “unsteady state of the strip application period” means at least one of an initial application period including the start of the application and a final application period including the end of the application.
[0009]
In addition, the speed control unit is configured to control the rotation speed of the rotating body, the strip supply speed of the strip supply unit, and the rotation speed of the roll when the strip can be appropriately attached during the strip attachment period in the unsteady state. It is possible to have a calculation means for calculating the change with time, and a controller for appropriately controlling the rotation speed of the rotating body, the strip supply speed of the strip supply means and the roll rotation speed based on the result calculated by the calculation means. preferable.
[0010]
Further, when the rotation speed of the rotating body is V1, the strip supply speed of the strip supply unit is V2, and the rotation speed of the roll is V3, the speed control unit determines that V1 = V3 at the initial stage of application including the start of application. And controlling with an acceleration pattern that satisfies the relationship in which the V2 / V3 ratio gradually decreases, and / or controlling with a deceleration pattern that satisfies the relationship of V1 = V3 and V3> V2 at the end of pasting including the end of pasting. Is preferred. In particular, at the initial stage of application including the start of application, 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 appropriate V2 / V3 ratio in the steady state depends on the type of the ribbon-like strip to be affixed (for example, the dimensions of the strip, the rubber quality, the rubber discharge temperature of the extruder, etc.). Preferably, it is in the range.
[0011]
In the method for molding a tire member according to the present invention, the speed control means controls the rotation speed of the rotating body, the strip supply speed of the strip supply means, and the rotation speed of the rolls, while rotating the rotation body via the pair of rolls from the strip supply means. In a method of molding a tire member, which conveys a ribbon-like strip onto the outer surface and presses the strip with a roll onto the outer surface of a rotating body in a spiral manner, the speed control means includes: a rotating speed of the rotating body; 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 during the strip application period in which the supply speed and the rotation speed of the roll are in an unsteady state. During the pasting of the strip in the unsteady state. 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 when the calculation means is in a non-stationary state in the strip sticking period, when the strip can be stuck properly, the rotation speed of the rotating body, the strip supply The change over time 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. Based on the calculation results transferred, the controller determines the rotation speed of the rotating body and the speed of the strip supply means. It is preferable to control the strip feed speed and the roll rotation speed.
[0013]
BEST MODE FOR CARRYING OUT 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]
The tire member molding apparatus 1 shown in FIG. 1 mainly includes a rotating body 2, a strip supply unit 3, a pair of rolls 4a and 4b, and a speed control unit 5. FIG. 2 is a view for explaining 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 attachment of the ribbon-shaped rubber strip.
[0015]
The rotator 2 has a cylindrical or toroidal outer surface, and FIG. 1 shows a case where the rotator 2 is a rigid core as an example of the hard core manufacturing method. The rotating body may have any shape or toroidal outer surface, and is not particularly limited.
[0016]
The strip supply means 3 is for supplying a ribbon-shaped rubber strip 6 to the rotating body 2, and in FIG. 1, the ribbon-shaped strip 6 is supplied by extruding a rubber having a predetermined cross-sectional shape from a mouthpiece 3a. Although an extruder 3 is shown, particularly a screw motor control type extruder, it may be a piston feed speed control type extruder or a screw and gear motor control type extruder, and is not particularly limited. For example, a ribbon-shaped strip prepared in advance may be spirally wound around a plurality of turns spirally, and the ribbon-shaped strip may be supplied from the coil-shaped member as a coil-shaped member.
[0017]
The pair of rolls 4a and 4b are located opposite to the rotating body 2 and convey the strip 6 supplied from the strip supply means 3 toward the rotating body 2, and any one of these rolls 4a and 4b is used. The single roll 4a is disposed on the outer surface of the rotating body 2 so as to spirally affix the strip 6 while pressing the strip 6 thereon.
[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]
The rotation of the rotating body 2, the strip supply of the strip supply means 3, and the rotation of the rolls 4a and 4b include a driving means connected to each of the rotating body 2, the strip supply means 3 and the rolls 4a and 4b, for example, An electric motor may be used.
[0020]
The main feature of the configuration of the present invention is to optimize the speed balance between 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. Specifically, the speed control unit 5 determines whether the rotation speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply unit 3, and the rotation speed V3 of the rolls 4a and 4b are in an unsteady state. 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 of the initial application time including the start time and the final application time including the end time. Of the strip supply speed V2 and the rotation speed V3 of the rolls 4a and 4b with time are calculated, and the strip 6 is attached in the unsteady state. That while, on the basis of the calculated result, the rotational 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]
In addition, by adopting the above configuration, in the unsteady state where the rotation speed of the rotating body, the strip supply speed of the strip supply unit and the rotation speed of the roll are difficult to stabilize, problems such as breakage of the strip and ejection of excess rubber are caused. Can be effectively suppressed.
[0022]
The speed control means 5 is mainly composed of a calculation means 7 and a controller 8.
[0023]
For example, the computer as shown in FIG. 1 calculates the rotation speed V1 of the rotating body 2 and the strip supply when the computer 6 as shown in FIG. The change with time of the strip supply speed V2 of the means 3 and the rotation speed V3 of the rolls 4a and 4b are calculated.
[0024]
The controller 8 appropriately controls the rotation speed V1 of the rotating body 2, the strip supply speed V2 of the strip supply unit 3, and the rotation speed V3 of the rolls 4a and 4b based on the calculation unit 7 and the result calculated by the calculation unit 7. I do. FIG. 1 shows a case in which controllers 8a, 8b and 8c are independently provided for the rotating body 2, the strip supply means 3 and the rolls 4a and 4b, respectively. 2, the rotation speed V1 of the strip supply means 3 and the rotation speed V3 of the rolls 4a and 4b may be controlled.
[0025]
The speed control unit 5 controls the rotation speed V1 of the rotating body, the strip supply speed V2 of the strip supply unit, and the rotation speed V3 of the rolls so as to have a predetermined speed balance, but is in an unsteady state where the speed balance is not determined. If the control in the initial stage of application including the start of application is performed in an acceleration pattern that satisfies the relationship of V1 = V3 and the V2 / V3 ratio gradually decreases, the ribbon-like strip extruded from the die of the extruder moves between the die and the bonding roll. Breaking can be effectively prevented.
[0026]
FIG. 3 shows an example of a change with time of the motor rotation speed when the initial stage of the pasting including the start of the pasting is controlled by an acceleration pattern satisfying a relationship in which V1 = V3 and the V2 / V3 ratio gradually decreases from 1. It is.
[0027]
If the speed control means 5 performs the control in the last stage of the pasting including the end of the pasting in the unsteady state where the speed balance is not determined in a deceleration pattern satisfying the relationship of V1 = V3 and V3> V2, the speed of the extruder can be reduced. Since the pressure in the head can be sufficiently reduced, it is possible to effectively prevent excess rubber from being discharged.
[0028]
FIG. 4 shows an example of a temporal change of the motor rotation speed when the end of the pasting including the end of the pasting is controlled by a deceleration pattern satisfying the relationship of V1 = V3 and V3> V2.
[0029]
The method of calculating the acceleration pattern, the deceleration pattern, and the like may be obtained from a diagram or may be obtained by an equation. Further, these patterns can be set according to the type of the ribbon-like strip to be affixed (for example, the dimensions of the strip, rubber properties, rubber discharge temperature of the extruder, etc.). Further, these patterns may be changed by the ability of a driving unit, for example, an electric motor, or the inertia of a rotating body.
[0030]
Next, an example of a method for molding a tire member of the present invention will be described below.
First, in order to control the rotation speed V1 of the rotator 2, the strip supply speed V2 of the strip supply means 3 and the rotation speed V3 of the rolls 4a and 4b, the computer 7 serving as calculation means constituting the speed control means 5 uses the rotator. 2, when the strip 6 can be properly applied during the strip application period in which the rotation speed V1, the strip supply speed V2 of the strip supply means 3, and the rotation speed V3 of the rolls 4a, 4b are in an unsteady state. Changes with time of 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 calculated.
[0031]
Next, the result calculated by the computer 7 is transferred to the controllers 8a to 8c, and the controllers 8a to 8c calculate the rotation speed V1 of the rotating body 2 and the strip supply speed V2 of the strip supply means 3 based on the transferred calculation result. While controlling the rotation speed V3 of the rolls 4a and 4b, the ribbon-like strip 6 is transported from the strip supply means 3 onto the rotating body 2 via the pair of rolls 4a and 4b, and the roll 4a is placed on the outer surface of the rotating body 2. By pressing the strip in a spiral while pressing the strip, the tire member can be molded.
[0032]
Then, if the tire member is molded by the molding method according to the present invention, the occurrence of strip breakage in the initial stage of application including the start of application is eliminated, and the amount of excess rubber discharged at the end of application including the end of application is reduced. It can be reduced by about 50% as compared with the conventional molding method in which the conventional speed control is performed.
[0033]
What has been described above is merely an example of the embodiment of the present invention, and various changes can be made within the scope of the claims.
[0034]
【The invention's effect】
According to the present invention, the rotation speed of the rotating body, the strip supply speed of the strip supply unit, and the rotation speed of the roll are optimized to achieve a proper speed balance, and in particular, the pasting including the start of the pasting and the end of the pasting. As in the last stage, 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, it is possible to effectively suppress the occurrence of troubles such as strip breakage and excessive rubber discharge. It has become possible to provide a molding device and a molding method for a tire member.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of a tire member molding apparatus according to the present invention.
FIG. 2 is a schematic side view for explaining a positional relationship between a rotating body, a strip supply unit and a roll shown in FIG. 1 and a state of attaching a ribbon-shaped strip.
FIG. 3 is a diagram showing an example of a change with time of the motor rotation speed when the initial stage of pasting including the start of pasting is controlled by an acceleration pattern satisfying a relationship in which V1 = V3 and a V2 / V3 ratio gradually decreases from 1; It is.
FIG. 4 is a diagram showing an example of a temporal change of the motor rotation speed when the end of attachment including the end of attachment is controlled by a deceleration pattern satisfying a relationship of V1 = V3 and V3> V2.
[Explanation of symbols]
1 Tire member molding device 2 Rotary 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 opposite to the rotating body, transporting the strip supplied from the strip supply means toward the rotating body, and applying the strip in a spiral 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 device comprising
The speed control means controls the rotation of the rotating body when the strip can be properly attached during the strip attaching period in which the rotation speed of the rotating body, the strip supply speed of the strip supply means and the rotation speed of the roll are in an unsteady state. The rotation speed of the strip supply means and the change over time of the strip supply speed and the rotation speed of the roll are calculated over time, and while the strip is attached in the unsteady state, the rotation speed of the rotating body is determined based on the calculated result. An apparatus for molding a tire member, wherein a strip supply speed of a strip supply means and a rotation 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。2. The tire member forming apparatus according to claim 1, wherein the strip application period in the unsteady state is at least one of an initial application period including an application start time and an application end period including an application end time. 3. 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 controls 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 during the strip application period in the unsteady state. 2. The computer according to claim 1, further comprising: a calculating unit that calculates the change, and a controller that appropriately controls a rotation speed of the rotating body, a strip supply speed of the strip supply unit, and a roll rotation speed based on a result calculated by the calculation unit. 3. The apparatus for molding a tire member according to 2. 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請求項２又は３記載のタイヤ部材の成型装置。When the rotation speed of the rotator is V1, the strip supply speed of the strip supply unit is V2, and the rotation speed of the roll is V3, V1 = V3 and V2 at the initial stage of application including the start of application. The tire member molding apparatus according to claim 2, wherein the control is performed with an acceleration pattern that satisfies a relationship in which the / V3 ratio gradually decreases. 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請求項２、３又は４記載のタイヤ部材の成型装置。When the rotation speed of the rotator is V1, the strip supply speed of the strip supply unit is V2, and the roll rotation speed is V3, V1 = V3 and V3 at the end of the application including the end of application. 5. The tire member molding apparatus according to claim 2, wherein the control is performed with a deceleration pattern satisfying 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 supply speed of the strip supply means, and the rotation speed of the rolls by the speed control means, the ribbon-shaped strip is conveyed onto the rotating body from the strip supply means via the pair of rolls, and rotated. In a method of forming a tire member to be spirally attached while pressing a strip with a roll on the outer surface of the body,
The speed control means controls the rotation of the rotating body when the strip can be properly attached during the strip attaching period in which the rotation speed of the rotating body, the strip supply speed of the strip supply means and the rotation speed of the roll are in an unsteady state. The rotation speed of the strip supply means and the change over time of the strip supply speed and the rotation speed of the roll are calculated over time, and while the strip is attached in the unsteady state, the rotation speed of the rotating body is determined based on the calculated result. A method for molding a tire member, comprising controlling a strip supply speed of a strip supply means and a rotation speed of a roll. 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 calculating means and a controller, and in a strip sticking period in which the calculating means is in an unsteady state, when the strip can be properly stuck, the rotation speed of the rotating body, the strip feeding means. The change over time of the strip supply speed and the roll rotation speed is calculated, and the calculated result is transferred to the controller. Based on the transferred calculation result, the controller determines the rotation speed of the rotating body and the strip supply of the strip supply unit. The method for molding a tire member according to claim 6, wherein the speed and the rotation speed of the roll are controlled.
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