JP4277989B2 - Tire molds and plugs used for vent holes in tire molds - Google Patents

Tire molds and plugs used for vent holes in tire molds Download PDF

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Publication number
JP4277989B2
JP4277989B2 JP2003192785A JP2003192785A JP4277989B2 JP 4277989 B2 JP4277989 B2 JP 4277989B2 JP 2003192785 A JP2003192785 A JP 2003192785A JP 2003192785 A JP2003192785 A JP 2003192785A JP 4277989 B2 JP4277989 B2 JP 4277989B2
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Prior art keywords
tire
vent hole
diameter
mold
guide member
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JP2005028589A (en
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登起雄 菅沼
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0617—Venting devices, e.g. vent plugs or inserts

Description

【０００１】
【発明の属する技術分野】
この発明は、タイヤ成形用金型およびタイヤ成形用金型のベントホールに使用するプラグにかかわり、更に詳しくはタイヤ加硫成形時に、タイヤ表面にスピューを発生させることなく成形でき、タイヤ仕上げ工程作業の改善と、製品タイヤの外観を向上させることが出来るタイヤ成形用金型およびタイヤ成形用金型のベントホールに使用するプラグに関するものである。
【０００２】
【従来の技術】
従来、タイヤ加硫工程で使用されるタイヤ成形用金型には、タイヤ加硫成形時に金型内面と未加硫タイヤとの間に溜まったエアーを金型外部に排気させるために、ベントホールと呼称される多数の細い排気穴が形成されている。
【０００３】
この多数のベントホールは、一般的に金型のエアーが残り易い箇所に加工され、例えば、ビードリング、リムクション、サイド部等に対応する金型の同一周上の８ヶ所以上に加工されており、周列数はタイヤ形状によって異なっている。
【０００４】
また、タイヤトレッド部の溝に囲まれた金型のデザインブロック内のベントホールは、１ヶ所以上加工されている（例えば、特許文献１，特許文献２参照）。
【０００５】
【特許文献１】
実開平７−３３６１５号のマイクロフィルム（第１〜３頁、図１）
【０００６】
【特許文献２】
実開昭６２−１３６１１号のマイクロフィルム（第１〜３頁、図１）
【０００７】
【発明が解決しようとする課題】
然しながら、多数のベントホールを備えた金型によりタイヤを加硫成形すると、多数のベントホールに加硫ゴムが流れ込み、製品タイヤの表面には多数の髭状の突起（スピュー）が発生する。
【０００８】
このため、タイヤ成形後のタイヤ仕上げ工程では、上記のスピューを切除する作業が不可欠となり、作業性及び生産性を阻害させるばかりか、切除したスピューの屑が多数散らばって作業環境を悪化させ、更に製品タイヤの外観を向上させることが難しいと言う問題があった。
【０００９】
この発明は、かかる従来の問題点に着目して案出されたもので、タイヤ加硫成形時に、タイヤ表面にスピューを発生させることなく成形でき、タイヤ仕上げ工程作業のスピュー除去作業を省略でき、作業環境を改善することが出来ると共に、製品タイヤの外観を向上させることが出来るタイヤ成形用金型およびタイヤ成形用金型のベントホールに使用するプラグを提供することを目的とするものである。
【００１０】
【課題を解決するための手段】
上記目的を達成するため、この発明のタイヤ成形用金型は、タイヤ加硫成形時に、金型とタイヤとの間に溜まった空気を排気するための多数のベントホールを設け、前記各ベントホールに、金型内へのタイヤ挿入前はベントホールを開放し、タイヤ挿入後はタイヤの圧力によりベントホールを閉鎖するプラグ本体を着脱可能に装着したタイヤ成形用金型であって、前記ベントホールは、金型の内面から外部に向かって貫通する大径の凹部と、中径の凹部とを連接して形成され、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させ、前記プラグ本体の筒状部を前記中径の凹部に嵌合するとともに、ヘッド部の底面を前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接させてプラグ本体をベントホールに装着した際に、ヘッド部の外周面と大径の凹部の内周面との間にすき間を設けるとともに、このヘッド部の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面と大径の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖する構成にしたことを要旨とするものである。
【００１１】
本発明の別のタイヤ成形用金型は、タイヤ加硫成形時に、金型とタイヤとの間に溜まった空気を排気するための多数のベントホールを設け、前記各ベントホールに、金型内へのタイヤ挿入前はベントホールを開放し、タイヤ挿入後はタイヤの圧力によりベントホールを閉鎖するプラグ本体を、上端に大径の凹部を設けて段差を有する中空筒状に形成されたガイド部材に内挿して予め一体的に組み付けた状態で着脱可能に装着したタイヤ成形用金型であって、前記ベントホールは、金型の内面から外部に向かって貫通する排気筒部の金型の内面側に大径の凹部を有し、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させ、前記プラグ本体の筒状部を前記ガイド部材に嵌合するとともに、ヘッド部の底面を前記ガイド部材の段差面に当接させてプラグ本体をガイド部材と一体的に組み付けた状態でベントホールに装着した際に、ヘッド部の外周面と前記ガイド部材の大径の凹部の内周面との間にすき間を設けるとともに、このヘッド部の上面とガイド部材の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面とガイド部材の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記ガイド部材の段差面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖する構成にしたことを要旨とするものである。
【００１２】
また、この発明のタイヤ成形用金型のベントホールに使用するプラグは、金型に形成されたベントホールに着脱可能に装着するタイヤ成形用金型のベントホールに使用するプラグであって、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させた構成にして、このプラグ本体を、金型の内面から外部に向かって貫通する大径の凹部と、中径の凹部とを連接して形成されたベントホールに装着した際に、前記筒状部が前記中径の凹部に嵌合するとともに、ヘッド部の底面が前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接して、ヘッド部の外周面と大径の凹部の内周面との間にすき間が形成されるとともに、このヘッド部の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面と大径の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖するようにしたことを要旨とするものである。
【００１３】
本発明の別のタイヤ成形用金型のベントホールに使用するプラグは、金型に形成されたベントホールに、上端に大径の凹部を設けて段差を有する中空筒状に形成されたガイド部材に内挿して予め一体的に組み付けた状態で着脱可能に装着するタイヤ成形用金型のベントホールに使用するプラグであって、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させた構成にして、このプラグ本体を、前記筒状部が前記ガイド部材に嵌合するとともに、ヘッド部の底面が前記ガイド部材の段差面に当接してプラグ本体をガイド部材と一体的に組み付けた状態で、金型の内面から外部に向かって貫通する排気筒部の金型の内面側に大径の凹部を有したベントホールに装着した際に、ヘッド部の外周面と前記ガイド部材の大径の凹部の内周面との間にすき間が形成されるとともに、このヘッド部の上面とガイド部材の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面とガイド部材の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記ガイド部材の段差面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖するようにしたことを要旨とするものである。
【００１４】
本発明では、前記連通路を、筒状部の内部を貫通する貫通穴または筒状部の外周面に形成された凹溝にすることもできる。また、前記プラグ本体を、耐熱性の樹脂材料により形成することもできる。
【００１５】
このように、金型に形成した多数のベントホールに、金型内へのタイヤ挿入前はベントホールを開放し、タイヤ挿入後はタイヤの圧力によりベントホールを閉鎖するプラグを着脱可能に装着したことにより、タイヤ加硫成形時に、タイヤ表面にスピューを発生させることなく成形でき、タイヤ仕上げ工程作業のスピュー除去作業を省略でき、作業環境を改善することが出来ると共に、製品タイヤの外観を向上させることが出来る。
【００１６】
【発明の実施の形態】
以下、添付図面に基づきこの発明の実施の形態を説明する。
図１は、この発明を実施したタイヤ成形用金型の一部拡大断面図を示し、金型１には、タイヤ加硫成形時に、金型１とタイヤＷとの間に溜まった空気を排気するための多数のベントホール２が形成されている。
【００１７】
前記各ベントホール２は、この実施形態では金型１の内面１ａから外部に向かって貫通する大径の凹部２ａ，中径の凹部２ｂを備えた段差が設けてあり、この各ベントホール２内には、図２に示すような、着脱可能な耐熱性樹脂（例えば、ポリテトラ フルオロ エチレン）により一体的に形成したプラグ本体３ａが装着してある。
【００１８】
前記プラグ本体３ａは、ベントホール２の中径の凹部２ｂの排気筒部４に嵌合する筒状部３ｘと、大径の凹部２ａに当接する例えば、直径Ｄが０．５ｍｍ 〜２０ｍｍのヘッド部３ｙとから成り、前記筒状部３ｘには、前記排気筒部４とを連通する連通路５が形成してあり、また前記ヘッド部３ｙには、前記連通路５と金型１の内部とを連通または遮断する開閉弁部６が形成してある。
【００１９】
この開閉弁部６は、金型１内へのタイヤ挿入前はベントホール２を開放し、タイヤ挿入後はタイヤＷの圧力によりベントホール２を閉鎖する弁機能を有するもので、凹部２ａに当接するヘッド部３ｙの底面側の少なくとも一箇所を水平または傾斜して切欠して肉厚を薄くし、この切欠部は前記筒状部３ｘの連通路５まで切欠されて連通している。
【００２０】
従って、肉厚の薄い部分のヘッド部３ｙの開閉弁部６は、金型１内へのタイヤＷが挿入されると、その挿入圧力により凹部２ａに当接して連通路５と金型１の内部との連通部を遮断し、また金型１内へのタイヤ挿入前はベントホール２を開放した状態で金型１とタイヤＷとの間のエアーを外部に排気出来るものである。従って、タイヤ加硫時における溶融状態の加硫ゴムは、ベントホール２内に流れ込むことはなく、スピューの発生も防止することが出来るのである。
【００２１】
また、前記プラグ本体３ａの筒状部３ｘに形成する連通路５としては、この実施形態では、図１〜図３に示すように、筒状部３ｘの中心部に貫通穴５を形成してあるが、これに限定されず、筒状部３ｘの外周面の軸方向に少なくとも一本以上の凹溝を形成しても良い。
【００２２】
更に、この発明の実施形態では、前記プラグ本体３ａは、単体でベントホール２に装着するようにしてあるが、この実施形態に限定されず、例えば、図３に示すように、予めベントホール２の排気筒部４及び段差を有する大径の凹部２ｃにそれぞれ嵌合するような金属製（例えば、ステンレス等）の中空筒状に形成されたガイド部材７と一体的に組付けた状態で装着しても良く、このガイド部材７の内側にはプラグ本体３ａが嵌合する段差を有する凹部２ａが形成してある。
【００２３】
このように構成すれば、プラグ本体３ａとベントホール２との位置決めや、プラグ本体３ａの加工寸法精度も向上させることが出来るものである。
【００２４】
上記のような、多数のベントホール２にプラグ本体３ａをそれぞれ装着した金型１によりタイヤＷを成形すると、上述したように、金型Ｗ内へのタイヤ挿入前はベントホール２を開放しているため、金型１とタイヤＷとの間のエアーは、ベントホール２を通って外部に排気され、またタイヤ挿入後はタイヤ１の圧力によりベントホール２を閉鎖するので、タイヤ加硫時における溶融状態の加硫ゴムは、ベントホール２内に流れ込むことはなく、従ってスピューの発生はなく、図４に示すようなクレータ状の微小な突起８を備えた外観の良好なタイヤＷを製造することが出来るものである。
【００２５】
【発明の効果】
この発明は、上記のように金型に形成した多数のベントホールに、金型内へのタイヤ挿入前はベントホールを開放し、タイヤ挿入後はタイヤの圧力によりベントホールを閉鎖するプラグ本体を着脱可能に装着したことにより、タイヤ加硫成形時に、タイヤ表面にスピューを発生させることなく成形でき、タイヤ仕上げ工程作業のスピュー除去作業を省略でき、またスピューの屑の発生することが少ないので作業環境を改善することが出来ると共に、材料のコストダウンを図る可能であり、更に製品タイヤの外観を向上させることが出来る効果がある。
【図面の簡単な説明】
【図１】この発明を実施したタイヤ成形用金型の一部拡大断面図である。
【図２】金型のベントホールに装着するプラグの斜視図である。
【図３】他の実施形態を示すタイヤ成形用金型の一部拡大断面図である。
【図４】この発明のタイヤ成形用金型で製造されたタイヤの一部斜視図である。
【符号の説明】
１ 金型 １ａ 金型の内面
２ ベントホール ２ａ 大径の凹部
２ｂ 中径の凹部 ２ｃ 大径の凹部
３ａ プラグ本体
３ｘ 筒状部 ３ｙ ヘッド部
４ 排気筒部 ５ 連通路
６ 開閉弁部 ７ ガイド部材
８ 微小な突起[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tire molding die and a plug used for a vent hole of a tire molding die , and more specifically, during tire vulcanization molding, the tire surface can be molded without generating spew, and the tire finishing process work And a plug used for a vent hole of a tire molding die and a tire molding die that can improve the appearance of a product tire.
[0002]
[Prior art]
Conventionally, a tire molding die used in a tire vulcanization process has a vent hole for exhausting air accumulated between the inner surface of the die and an unvulcanized tire to the outside of the die during tire vulcanization molding. A large number of narrow exhaust holes called “a” are formed.
[0003]
These numerous vent holes are generally machined into locations where mold air is likely to remain. For example, the vent holes are machined into 8 or more locations on the same circumference of the die corresponding to bead rings, rims, side portions, etc. The number of circumferential rows varies depending on the tire shape.
[0004]
Further, at least one vent hole in the mold design block surrounded by the groove of the tire tread portion is processed (see, for example, Patent Document 1 and Patent Document 2).
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 7-33615 microfilm (pages 1-3)
[0006]
[Patent Document 2]
Japanese Utility Model Publication No. 62-13611 microfilm (pages 1-3)
[0007]
[Problems to be solved by the invention]
However, when a tire is vulcanized and molded with a mold having a large number of vent holes, the vulcanized rubber flows into the large number of vent holes, and a large number of spider-like protrusions (spews) are generated on the surface of the product tire.
[0008]
For this reason, in the tire finishing process after molding the tire, it is indispensable to excise the above spew, which not only hinders workability and productivity, but also a lot of excised spew scraps are scattered to deteriorate the working environment. There was a problem that it was difficult to improve the appearance of the product tire.
[0009]
This invention has been devised by paying attention to such conventional problems, can be molded without generating spew on the tire surface during tire vulcanization molding, can eliminate the spew removal work of the tire finishing process work, An object of the present invention is to provide a tire molding die capable of improving the working environment and improving the appearance of a product tire, and a plug used for a vent hole of the tire molding die .
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a tire molding die according to the present invention is provided with a plurality of vent holes for exhausting air accumulated between the die and the tire during tire vulcanization molding, In addition, a tire molding die in which a vent hole is opened before the tire is inserted into the mold and a plug body is detachably mounted after the tire is inserted to close the vent hole due to the pressure of the tire. Is formed by connecting a large-diameter concave portion penetrating from the inner surface of the mold toward the outside and a medium-diameter concave portion, and the plug body has a diameter larger than that of the cylindrical portion at the upper end of the cylindrical portion. The disk-shaped head part is integrally formed, and the communication path is extended vertically in the cylindrical part, and at least one part on the bottom surface side of the head part is cut horizontally or inclined to form a meat. Form a notch with reduced thickness The notch is communicated to said communication passage, with fitting the cylindrical portion of the plug body into the recess in said diameter, position the bottom surface of the head portion at the boundary between the concave portion and the large diameter of the recess in said diameter When the plug body is attached to the vent hole by contacting the bottom surface of the large-diameter concave portion, a gap is provided between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter concave portion. Set the upper surface and the upper surface of the vent hole at the same level , before inserting the tire into the mold, the gap between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter recess, The vent hole is opened through the notch and the communication passage, and after inserting the tire, the notch is positioned at the boundary between the medium-diameter recess and the large-diameter recess by the tire insertion pressure. abut the the bottom surface to cut off the communication between the gap and the notch portion It is an Abstract that was configured to close the vent hole.
[0011]
Another mold for molding a tire according to the present invention is provided with a number of vent holes for exhausting air accumulated between the mold and the tire during tire vulcanization molding. A guide member formed in a hollow cylindrical shape having a stepped portion with a large diameter recess provided at the upper end of the plug body that opens the vent hole before inserting the tire into the tire and closes the vent hole by tire pressure after inserting the tire A mold for tire molding that is detachably mounted in a state of being integrally assembled in advance with the vent hole, and the vent hole is an inner surface of the mold of the exhaust tube portion that penetrates from the inner surface of the mold toward the outside The plug body is formed by integrally forming a disk-shaped head portion having a diameter larger than that of the cylindrical portion at the upper end of the cylindrical portion, and is connected to the cylindrical portion. The passage extends vertically and the bottom of the head portion At least one side of the plug is horizontally or inclined to form a cutout with a reduced thickness, and the cutout is communicated to the communication path, and the cylindrical portion of the plug body is fitted to the guide member while, when it is attached to the vent hole to the bottom surface of the head portion in a state where the plug body is brought into contact with the stepped guide member and assembled integrally with the guide member, the outer peripheral surface and the guide member of the head portion Insert a tire into the mold by providing a gap between the inner peripheral surface of the large-diameter recess and setting the upper surface of the head, the upper surface of the guide member, and the upper surface of the vent hole to the same level. Before, the vent hole is opened through the gap between the outer peripheral surface of the head portion and the inner peripheral surface of the concave portion of the guide member, the notch portion, and the communication path. After inserting the tire, the tire insertion pressure Before A notch, it is an gist that a configuration for closing the guide vent hole to shut off the communication between the gap and the notch is brought into contact with the stepped surface of the member.
[0012]
Further, the plug used for the vent hole of the tire molding die of the present invention is a plug used for the vent hole of the tire molding die that is detachably attached to the vent hole formed in the die, The plug body is formed integrally with a disk-shaped head portion having a diameter larger than that of the tubular portion at the upper end of the tubular portion, and the communication passage extends vertically in the tubular portion. At least one location on the bottom side of the head portion is horizontally or inclined to form a cutout portion with a reduced thickness, and the cutout portion is communicated to the communication path. When the large-diameter concave portion penetrating from the inner surface of the mold toward the outside and the medium-diameter concave portion are attached to the vent hole, the cylindrical portion is fitted into the medium-diameter concave portion. In addition, the bottom surface of the head portion is large with the medium-diameter concave portion. And the bottom surface of the large diameter of the recess located at the boundary between the recessed portion abuts, and with a gap is formed between the inner circumferential surface of the outer circumferential surface and the large diameter of the recess of the head portion, and the upper surface of the head portion Set so that the upper surface of the vent hole is at the same level , and before inserting the tire into the mold, the gap between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter recess, and the notch And the vent hole is opened through the communication passage, and after inserting the tire, the bottom surface of the large-diameter recess located at the boundary between the medium-diameter recess and the large-diameter recess by the tire insertion pressure. The vent hole is closed by shutting off the communication between the gap and the notch by contacting the gap.
[0013]
A plug used for a vent hole of another mold for molding a tire according to the present invention is a guide member formed in a hollow cylinder having a step by providing a large-diameter recess at the upper end of the vent hole formed in the mold. The plug body is a plug used for a vent hole of a tire molding die that is detachably mounted in a state of being integrally assembled in advance, and the plug body is located at the upper end of the tubular portion than the tubular portion. A large-diameter disk-shaped head part is integrally formed, and a communicating path is extended vertically in the cylindrical part, and at least one part on the bottom side of the head part is horizontally or inclined to be cut out. And forming a notch portion with a reduced thickness and communicating the notch portion to the communication path. The plug body is fitted to the guide member by the tubular portion, and the head portion bottom abuts the stepped surface of the guide member When the plug body is integrally assembled with the guide member, and attached to a vent hole having a large-diameter recess on the inner surface side of the mold of the exhaust tube portion that penetrates from the inner surface of the mold toward the outside In addition, a gap is formed between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter concave portion of the guide member, and the upper surface of the head portion, the upper surface of the guide member, and the upper surface of the vent hole are at the same level. Before inserting the tire into the mold, vent through the gap between the outer peripheral surface of the head portion and the inner peripheral surface of the recess of the guide member, the notch portion, and the communication passage. Open the hole, and after inserting the tire, the notch is brought into contact with the stepped surface of the guide member by the pressure of the tire to close the vent hole by blocking communication between the gap and the notch. The summary That.
[0014]
In the present invention, the communication path may be a through hole penetrating the inside of the cylindrical portion or a concave groove formed in the outer peripheral surface of the cylindrical portion. Further, the plug body can be formed of a heat resistant resin material.
[0015]
In this way, a large number of vent holes formed in the mold are detachably mounted with plugs that open the vent holes before inserting the tire into the mold and close the vent holes by the tire pressure after inserting the tire. Therefore, it is possible to mold without generating spew on the tire surface at the time of tire vulcanization molding, it is possible to omit the spew removal work of the tire finishing process work, improve the working environment, and improve the appearance of the product tire I can do it.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a partially enlarged cross-sectional view of a tire molding die embodying the present invention. The die 1 exhausts air accumulated between the die 1 and the tire W during tire vulcanization molding. A large number of vent holes 2 are formed.
[0017]
In this embodiment, each vent hole 2 is provided with a step having a large-diameter concave portion 2a and a medium-diameter concave portion 2b penetrating from the inner surface 1a of the mold 1 to the outside. As shown in FIG. 2, a plug main body 3a integrally formed of a detachable heat resistant resin (for example, polytetrafluoroethylene) is attached.
[0018]
The plug main body 3a includes a cylindrical portion 3x that fits into the exhaust cylinder portion 4 of the medium-diameter concave portion 2b of the vent hole 2, and a head that has a diameter D of 0.5 mm to 20 mm that contacts the large-diameter concave portion 2a. A communication passage 5 communicating with the exhaust cylinder portion 4 is formed in the tubular portion 3x, and the communication passage 5 and the interior of the mold 1 are formed in the head portion 3y. door opening and closing valve unit 6 is formed which communicates or blocks the.
[0019]
This on-off valve portion 6 has a valve function of opening the vent hole 2 before inserting the tire into the mold 1 and closing the vent hole 2 by the pressure of the tire W after inserting the tire. At least one part on the bottom surface side of the contacting head portion 3y is cut horizontally and inclined to reduce the thickness, and this cut portion is cut and communicated to the communication path 5 of the cylindrical portion 3x.
[0020]
Therefore, when the tire W is inserted into the mold 1, the opening / closing valve section 6 of the thin head portion 3 y comes into contact with the recess 2 a due to the insertion pressure, and the communication path 5 and the mold 1. The communication part with the inside is shut off, and the air between the mold 1 and the tire W can be exhausted outside with the vent hole 2 opened before the tire is inserted into the mold 1. Therefore, the vulcanized rubber in the molten state at the time of tire vulcanization does not flow into the vent hole 2 and can prevent spew.
[0021]
Further, in this embodiment, as shown in FIGS. 1 to 3, the through-hole 5 is formed in the central portion of the tubular portion 3x as the communication passage 5 formed in the tubular portion 3x of the plug body 3a. However, the present invention is not limited to this, and at least one groove may be formed in the axial direction of the outer peripheral surface of the cylindrical portion 3x.
[0022]
Furthermore, in the embodiment of the present invention, the plug body 3a is attached to the vent hole 2 as a single unit. However , the present invention is not limited to this embodiment. For example, as shown in FIG. Attached in a state of being integrally assembled with a metal (for example, stainless steel) hollow cylindrical guide member 7 that fits in the exhaust cylinder 4 and the large-diameter recess 2c having a step. Alternatively, a concave portion 2a having a step in which the plug body 3a is fitted is formed inside the guide member 7.
[0023]
If comprised in this way, the positioning of the plug main body 3a and the vent hole 2 and the processing dimensional accuracy of the plug main body 3a can be improved.
[0024]
When the tire W is molded by the mold 1 in which the plug bodies 3a are respectively attached to the numerous vent holes 2 as described above, the vent hole 2 is opened before the tire is inserted into the mold W as described above. Therefore, the air between the mold 1 and the tire W is exhausted to the outside through the vent hole 2, and the vent hole 2 is closed by the pressure of the tire 1 after the tire is inserted. The molten vulcanized rubber does not flow into the vent hole 2, and therefore, spew is not generated, and a tire W having a good appearance having crater-like minute protrusions 8 as shown in FIG. 4 is manufactured. It can be done.
[0025]
【The invention's effect】
The present invention provides a plug body that opens a vent hole before inserting a tire into the mold and closes the vent hole by the pressure of the tire after inserting the tire into a large number of vent holes formed in the mold as described above. By attaching it detachably, it can be molded without generating spew on the tire surface at the time of tire vulcanization molding, it is possible to omit the spew removal work of the tire finishing process work and work with less spew waste The environment can be improved, the cost of the material can be reduced, and the appearance of the product tire can be further improved.
[Brief description of the drawings]
FIG. 1 is a partially enlarged sectional view of a tire molding die embodying the present invention.
FIG. 2 is a perspective view of a plug attached to a vent hole of a mold.
FIG. 3 is a partially enlarged cross-sectional view of a tire molding die showing another embodiment.
FIG. 4 is a partial perspective view of a tire manufactured using a tire molding die according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mold 1a Inner surface 2 Bent hole 2a Large diameter recessed part 2b Medium diameter recessed part 2c Large diameter recessed part 3a Plug main body 3x Cylindrical part 3y Head part 4 Exhaust cylinder part 5 Communication path 6 On-off valve part 7 Guide member 8 Minute protrusion

Claims (8)

タイヤ加硫成形時に、金型とタイヤとの間に溜まった空気を排気するための多数のベントホールを設け、前記各ベントホールに、金型内へのタイヤ挿入前はベントホールを開放し、タイヤ挿入後はタイヤの圧力によりベントホールを閉鎖するプラグ本体を着脱可能に装着したタイヤ成形用金型であって、前記ベントホールは、金型の内面から外部に向かって貫通する大径の凹部と、中径の凹部とを連接して形成され、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させ、前記プラグ本体の筒状部を前記中径の凹部に嵌合するとともに、ヘッド部の底面を前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接させてプラグ本体をベントホールに装着した際に、ヘッド部の外周面と大径の凹部の内周面との間にすき間を設けるとともに、このヘッド部の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面と大径の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖する構成にしたタイヤ成形用金型。At the time of tire vulcanization molding, a number of vent holes for exhausting the air accumulated between the mold and the tire are provided, and each vent hole is opened before the tire is inserted into the mold. A tire molding die detachably mounted with a plug body that closes a vent hole by a tire pressure after inserting the tire, wherein the vent hole is a large-diameter concave portion penetrating from the inner surface of the die toward the outside. The plug body is formed by integrally forming a disk-shaped head portion having a larger diameter than the tubular portion at the upper end of the tubular portion. A communication path is formed in the shape portion so as to extend in the vertical direction, and at least one portion on the bottom surface side of the head portion is horizontally or inclined to form a cutout portion having a reduced thickness, and the cutout portion is formed into the communication portion. Communicating to the passage, the plug body The Jo portion with fitted in the recess in said diameter, is brought into contact with the bottom surface of the recess of the larger diameter vent plug body located the bottom of the head portion at the boundary between the concave portion and the large diameter of the recess in said diameter When installed in the hole, a gap is provided between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter recess, and the upper surface of the head portion and the upper surface of the vent hole are set to the same level. Before inserting the tire into the mold, the vent hole is opened through the gap between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter recess, the cutout portion, and the communication path, After inserting the tire, the notch is brought into contact with the bottom surface of the large-diameter concave portion located at the boundary between the medium-diameter concave portion and the large-diameter concave portion by the tire insertion pressure so that the clearance and the notch portion communicate with each other. A mold for tire molding that is configured to shut off and close the vent hole. タイヤ加硫成形時に、金型とタイヤとの間に溜まった空気を排気するための多数のベントホールを設け、前記各ベントホールに、金型内へのタイヤ挿入前はベントホールを開放し、タイヤ挿入後はタイヤの圧力によりベントホールを閉鎖するプラグ本体を、上端に大径の凹部を設けて段差を有する中空筒状に形成されたガイド部材に内挿して予め一体的に組み付けた状態で着脱可能に装着したタイヤ成形用金型であって、前記ベントホールは、金型の内面から外部に向かって貫通する排気筒部の金型の内面側に大径の凹部を有し、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させ、前記プラグ本体の筒状部を前記ガイド部材に嵌合するとともに、ヘッド部の底面を前記ガイド部材の段差面に当接させてプラグ本体をガイド部材と一体的に組み付けた状態でベントホールに装着した際に、ヘッド部の外周面と前記ガイド部材の大径の凹部の内周面との間にすき間を設けるとともに、このヘッド部の上面とガイド部材の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面とガイド部材の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記ガイド部材の段差面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖する構成にしたタイヤ成形用金型。At the time of tire vulcanization molding, a number of vent holes for exhausting the air accumulated between the mold and the tire are provided, and each vent hole is opened before the tire is inserted into the mold. After inserting the tire, the plug body that closes the vent hole by the pressure of the tire is inserted in a hollow cylindrical guide member with a large-diameter recess at the upper end and assembled in advance in an integrated manner A tire molding die that is detachably attached, wherein the vent hole has a large-diameter recess on the inner surface side of the die of an exhaust tube portion that penetrates from the inner surface of the die toward the outside, and the plug The main body is integrally formed with a disk-shaped head portion having a diameter larger than that of the cylindrical portion at the upper end of the cylindrical portion, and a communication path extends vertically in the cylindrical portion, and the head At least one place on the bottom side of the A notch portion that is inclined and cut to reduce the thickness is formed, the notch portion is communicated to the communication path, the tubular portion of the plug body is fitted to the guide member, and the bottom surface of the head portion is when attached to the vent hole in a state in which the plug body is brought into contact with the stepped guide member and assembled integrally with the guide member, the inner peripheral surface of the concave portion of the large-diameter outer peripheral surface and the guide member of the head portion The upper surface of the head portion, the upper surface of the guide member, and the upper surface of the vent hole are set at the same level , and the outer peripheral surface of the head portion is inserted before the tire is inserted into the mold. The vent hole is opened through the gap between the guide member and the inner peripheral surface of the recess of the guide member, the notch, and the communication path. After inserting the tire, the notch is guided by the tire insertion pressure. Member level difference Tire mold that was configured to close the vent hole to shut off the communication between the gap and the notch is brought into contact. 前記連通路が、筒状部の内部を貫通する貫通穴または筒状部の外周面に形成された凹溝である請求項１または２に記載のタイヤ成形用金型。  The tire molding die according to claim 1 or 2, wherein the communication path is a through hole penetrating the inside of the cylindrical part or a concave groove formed in an outer peripheral surface of the cylindrical part. 前記プラグ本体を、耐熱性の樹脂材料により形成した請求項１または２に記載のタイヤ成形用金型。  The tire mold according to claim 1 or 2, wherein the plug body is formed of a heat-resistant resin material. 金型に形成されたベントホールに着脱可能に装着するタイヤ成形用金型のベントホールに使用するプラグであって、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させた構成にして、このプラグ本体を、金型の内面から外部に向かって貫通する大径の凹部と、中径の凹部とを連接して形成されたベントホールに装着した際に、前記筒状部が前記中径の凹部に嵌合するとともに、ヘッド部の底面が前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接して、ヘッド部の外周面と大径の凹部の内周面との間にすき間が形成されるとともに、このヘッド部の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面と大径の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記中径の凹部と大径の凹部との境界に位置する大径の凹部の底面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖するようにしたタイヤ成形用金型のベントホールに使用するプラグ。A plug used in a vent hole of a tire molding die that is detachably attached to a vent hole formed in a die, wherein the plug body has a diameter larger than that of the cylindrical portion at an upper end of the cylindrical portion. A disk-shaped head part is integrally formed, and a communicating path is extended in the vertical direction in the cylindrical part, and at least one part on the bottom side of the head part is horizontally or inclined to be cut off and thickened. The notch is made thin, and the notch is communicated to the communication path. The plug main body has a large-diameter recess that penetrates from the inner surface of the mold to the outside, and a medium-diameter recess. When the cylindrical portion is fitted to the medium-diameter concave portion when the concave portion is connected to the vent hole formed in a connected manner, the bottom surface of the head portion is formed of the medium-diameter concave portion and the large-diameter concave portion. in contact with the bottom surface of the recess of larger diameter located on the boundary, out of the head portion With gap between the surface and the inner peripheral surface of the large-diameter recess is formed, it is set so that the upper surface of the top and the vent hole of the head portion is at the same level, front tire inserted into the mold The vent hole is opened through the gap between the outer peripheral surface of the head portion and the inner peripheral surface of the large-diameter concave portion, the notch portion, and the communication path. The notch is brought into contact with the bottom surface of the large-diameter recess located at the boundary between the medium-diameter recess and the large-diameter recess so as to block communication between the gap and the notch so as to close the vent hole. Plug used for vent holes in tire molds. 金型に形成されたベントホールに、上端に大径の凹部を設けて段差を有する中空筒状に形成されたガイド部材に内挿して予め一体的に組み付けた状態で着脱可能に装着するタイヤ成形用金型のベントホールに使用するプラグであって、前記プラグ本体は、筒状部の上端にこの筒状部よりも大径の円盤状のヘッド部を一体的に形成してなり、前記筒状部に連通路を上下方向に延設するとともに、前記ヘッド部の底面側の少なくとも一箇所を水平または傾斜して切欠いて肉厚を薄くした切欠部を形成して、この切欠部を前記連通路まで連通させた構成にして、このプラグ本体を、前記筒状部が前記ガイド部材に嵌合するとともに、ヘッド部の底面が前記ガイド部材の段差面に当接してプラグ本体をガイド部材と一体的に組み付けた状態で、金型の内面から外部に向かって貫通する排気筒部の金型の内面側に大径の凹部を有したベントホールに装着した際に、ヘッド部の外周面と前記ガイド部材の大径の凹部の内周面との間にすき間が形成されるとともに、このヘッド部の上面とガイド部材の上面とベントホールの上面とが同じレベルになるように設定し、金型内へのタイヤ挿入前は、ヘッド部の外周面とガイド部材の凹部の内周面との間の前記すき間と、前記切欠部と、前記連通路とを通じてベントホールを開放状態にし、タイヤ挿入後はタイヤの挿入圧力により前記切欠部を、前記ガイド部材の段差面に当接させて前記すき間と切欠部との連通を遮断してベントホールを閉鎖するようにしたタイヤ成形用金型のベントホールに使用するプラグ。Tire molding that is removably mounted in a vent hole formed in the mold and inserted into a guide member formed in a hollow cylinder having a step with a large-diameter recess at the upper end and assembled in advance. A plug used for a vent hole of a metal mold, wherein the plug body is formed by integrally forming a disk-shaped head portion having a larger diameter than the tubular portion at an upper end of the tubular portion. A communication path is formed in the shape portion so as to extend in the vertical direction, and at least one portion on the bottom surface side of the head portion is horizontally or inclined to form a cutout portion having a reduced thickness, and the cutout portion is formed into the communication portion. in the structure in which communicated to passage, the plug body, together with the cylindrical portion is fitted into the guide member, the guide member and integrally plug body bottom surface of the head portion comes into contact with the stepped surface of the guide member In the assembled state of the mold When mounted in a vent hole having a large-diameter recess on the inner surface side of the mold of the exhaust tube portion penetrating from the surface toward the outside, the outer periphery of the head portion and the inner periphery of the large-diameter recess of the guide member A gap is formed between the head portion, the upper surface of the head portion, the upper surface of the guide member, and the upper surface of the vent hole so that they are at the same level. The vent hole is opened through the gap between the outer peripheral surface of the guide member and the inner peripheral surface of the concave portion of the guide member, the cutout portion, and the communication path. A plug used for a vent hole of a tire molding die which is brought into contact with a stepped surface of the guide member to block communication between the gap and the notch and thereby close the vent hole. 前記連通路が、筒状部の内部を貫通する貫通穴または筒状部の外周面に形成された凹溝である請求項６または７に記載のタイヤ成形用金型のベントホールに使用するプラグ。  The plug used for the vent hole of the tire molding die according to claim 6 or 7, wherein the communication path is a through hole penetrating the inside of the cylindrical part or a concave groove formed in an outer peripheral surface of the cylindrical part. . 前記プラグ本体を、耐熱性の樹脂材料により形成した請求項６または７に記載のタイヤ成形用金型のベントホールに使用するプラグ。  The plug used for the vent hole of the tire mold according to claim 6 or 7, wherein the plug body is formed of a heat-resistant resin material.
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