JP4501671B2 - Tire molding die and plug for tire molding die - Google Patents

Tire molding die and plug for tire molding die Download PDF

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JP4501671B2
JP4501671B2 JP2004363917A JP2004363917A JP4501671B2 JP 4501671 B2 JP4501671 B2 JP 4501671B2 JP 2004363917 A JP2004363917 A JP 2004363917A JP 2004363917 A JP2004363917 A JP 2004363917A JP 4501671 B2 JP4501671 B2 JP 4501671B2
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shaft portion
plug
tire
diameter
tire molding
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JP2006168191A (en
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登起雄 菅沼
陽久 長谷川
通博 姿
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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
    • 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

この発明はタイヤ成形金型及びタイヤ成形金型用のプラグにかかわり、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金型及びタイヤ成形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。 This invention relates to a plug for tire forming mold and the tire molding die, more particularly when the tire is vulcanized, can be molded without causing spew on tire surface, and improvement of tire finishing work, a product tire tire forming mold can be improved in appearance and those about the plug for use with the venthole of the tire molding die.

従来、タイヤ加硫工程で使用されるタイヤ成形金型には、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。   Conventionally, a tire mold used in a tire vulcanization process includes a vent hole in order to exhaust air accumulated between the mold inner surface and an unvulcanized tire to the outside of the mold during tire vulcanization molding. A large number of narrow exhaust holes, which are called, are formed.

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。   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.

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）。   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).

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。   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.

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。
実開平７−３３６１５号のマイクロフィルム 実開昭６２−１３６１１号のマイクロフィルム For this reason, in the tire finishing process after molding the tire, it is indispensable to excise the spew, which not only hinders workability and productivity, but also a lot of scraped 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.
Japanese Utility Model No.7-33615 microfilm Japanese Utility Model No. 62-13611 microfilm

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金型及びタイヤ成形金型用のプラグを提供することを目的とするものである。 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, it is possible to improve the working environment, it is an object to provide a plug for tire forming mold and the tire molding die which can improve the appearance of the product tire.

上記目的を達成するための、この発明のタイヤ成形金型は、複数の貫通穴（２ａ）からなるベントホール（２）にプラグ（３）を装着したタイヤ成形金型（１）において、前記プラグ（３）を、上端にテーパー凹状の嵌合部（８）を有しかつ前記貫通穴（２ａ）に嵌合する径大軸筒部（４ｘ）と、底面に排気穴（４ｂ）を有する小径の筒軸部（４ｙ）とを接続し、その側面に前記排気穴（４ｂ）に連通するスリット（６）を形成してなる金属製の筒状のホルダ（４）内に、棒状の小径の軸部（５ｂ）の一端に前記嵌合部（８）に嵌合する皿状のヘッド部（５ａ）を、他端に前記ホルダ（４）に嵌合する径大軸部（５ｃ）をそれぞれ設けると共に、前記軸部（５ｂ）の側面から前記径大軸部（５ｃ）の端面へ通じる排気穴（９ｂ、９ｃ）を形成してなる樹脂製の栓部材（５）を、前記径大軸部（５ｃ）が前記筒軸部（４ｙ）の底面である係止部（７）に当接するようにして挿入し、前記ヘッド部（５ａ）に圧力が加わると、前記軸部（５ｂ）の弾性変形により該ヘッド部（５ａ）が前記嵌合部（８）に密着するように構成すると共に、該プラグ（３）を前記ベントホール（２）に前記ヘッド部（５ａ）が内側を向くように装着したことを特徴とするものである。 For achieving the above Symbol purpose, the tire molding mold of this invention, a tire molding mold equipped with a plug (3) to the vent hole (2) comprising a plurality of through holes (2a) in (1), wherein The plug (3) has a tapered concave fitting portion (8) at the upper end and a large-diameter cylindrical tube portion (4x) that fits into the through hole (2a), and an exhaust hole (4b) on the bottom surface. A rod-shaped small diameter is formed in a metal cylindrical holder (4) formed by connecting a small-diameter cylindrical shaft portion (4y) and forming a slit (6) communicating with the exhaust hole (4b) on the side surface. One end of the shaft portion (5b) has a dish-like head portion (5a) fitted to the fitting portion (8), and the other end has a large diameter shaft portion (5c) fitted to the holder (4). Each is provided with exhaust holes (9b, 9c) that lead from the side surface of the shaft portion (5b) to the end surface of the large-diameter shaft portion (5c). The resin-made plug member (5) is inserted so that the large-diameter shaft portion (5c) contacts the locking portion (7) which is the bottom surface of the cylindrical shaft portion (4y), and the head portion When pressure is applied to (5a), the head portion (5a) is brought into close contact with the fitting portion (8) by elastic deformation of the shaft portion (5b), and the plug (3) is connected to the vent (5a). The head (5a) is mounted in the hole (2) so as to face inward .

前記栓部材（５）は、ショアー硬度がＤ５０〜６５である耐熱性樹脂から形成することが望ましい。The plug member (5) is preferably formed of a heat resistant resin having a Shore hardness of D50 to 65.

また、この発明のタイヤ成形金型用のプラグは、タイヤ成形金型（１）に形成された複数の貫通穴（２ａ）からなるベントホール（２）に装着するタイヤ成形金型用のプラグ（３）であって、上端にテーパー凹状の嵌合部（８）を有しかつ前記貫通穴（２ａ）に嵌合する径大軸筒部（４ｘ）と、底面に排気穴（４ｂ）を有する小径の筒軸部（４ｙ）とを接続し、その側面に前記排気穴（４ｂ）に連通するスリット（６）を形成してなる金属製の筒状のホルダ（４）内に、棒状の小径の軸部（５ｂ）の一端に前記嵌合部（８）に嵌合する皿状のヘッド部（５ａ）を、他端に前記ホルダ（４）に嵌合する径大軸部（５ｃ）をそれぞれ設けると共に、前記軸部（５ｂ）の側面から前記径大軸部（５ｃ）の端面へ通じる排気穴（９ｂ、９ｃ）を形成してなる樹脂製の栓部材（５）を、前記径大軸部（５ｃ）が前記筒軸部（４ｙ）の底面である係止部（７）に当接するようにして挿入し、前記ヘッド部（５ａ）に圧力が加わると、前記軸部（５ｂ）の弾性変形により該ヘッド部（５ａ）が前記嵌合部（８）に密着するように構成したことを特徴とするものである。 Moreover, the plug for tire molding dies of this invention is a plug for tire molding dies to be mounted in a vent hole (2) comprising a plurality of through holes (2a) formed in the tire molding dies (1) ( 3) having a tapered concave fitting portion (8) at the upper end, a large-diameter cylindrical tube portion (4x) fitting into the through hole (2a), and an exhaust hole (4b) on the bottom surface. A rod-shaped small diameter is formed in a metal cylindrical holder (4) formed by connecting a small-diameter cylindrical shaft portion (4y) and forming a slit (6) communicating with the exhaust hole (4b) on the side surface. One end of the shaft portion (5b) has a dish-like head portion (5a) fitted to the fitting portion (8), and the other end has a large diameter shaft portion (5c) fitted to the holder (4). Each is provided with exhaust holes (9b, 9c) that lead from the side surface of the shaft portion (5b) to the end surface of the large-diameter shaft portion (5c). The resin plug member (5) is inserted so that the large-diameter shaft portion (5c) is in contact with the locking portion (7) which is the bottom surface of the cylindrical shaft portion (4y), and the head portion ( When pressure is applied to 5a), the head portion (5a) comes into close contact with the fitting portion (8) by elastic deformation of the shaft portion (5b) .

前記栓部材（５）は、ショアー硬度がＤ５０〜６５である耐熱性樹脂から形成することが望ましい。The plug member (5) is preferably formed of a heat resistant resin having a Shore hardness of D50 to 65.

このように構成することで、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ものである。   By configuring in this way, at the time of tire vulcanization molding, it can be molded without generating spew on the tire surface, the spew removal work of the tire finishing process work can be omitted, the work environment can be improved, and the product tire The appearance can be improved.

この発明は、上記のように構成したので以下のような優れた効果を奏するものである。(a).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る。
(b).タイヤ仕上げ工程作業のスピュー除去作業を省略できる。
(c).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。
(d).材料のコストダウンを図ることも可能である。
(e).製品タイヤの外観を向上させることが出来る。 Since the present invention is configured as described above, the following excellent effects can be obtained. (a) During tire vulcanization molding, molding can be performed without generating spew on the tire surface.
(b) The spew removal work of the tire finishing process can be omitted.
(c) The work environment can be improved because there is little spew scrap.
(d) It is also possible to reduce the cost of materials.
(e) The appearance of the product tire can be improved.

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。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は、この発明の参考例であるタイヤ成形金型の一部拡大断面図を示し、１はタイヤ成形用の金型、２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金型１に形成されたベントホール、３はベントホール２に装着された金属製のホルダ４と樹脂製の栓部材５とから成るプラグを示している。 1 shows a partially enlarged cross-sectional view of the tire molding die is a reference example of this invention, between 1 mold for molding a tire, 2 is a mold 1 and tire W during tire vulcanization A vent hole 3 formed in the mold 1 for exhausting the air accumulated in the metal plate 3 is a plug comprising a metal holder 4 and a resin plug member 5 mounted in the vent hole 2.

前記金型１に形成された各ベントホール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貫通穴２ａと中径の貫通穴２ｂとが段差を設けて形成してあり、この各ベントホール２内には、図２及び図３に示すような、ステンレス，アルミ合金等の耐熱性の金属材料により一体的に形成した円筒状のホルダ４と、このホルダ４の排気筒部４ａ内に嵌合された耐熱性樹脂材料（ショアー硬度がＤ５０〜６５の例えば、ポリテトラ フルオロ エチレン）により一体的に形成された栓部材５とから成るプラグ３が着脱可能に装着してある。   In this embodiment, each vent hole 2 formed in the mold 1 has a large-diameter through hole 2a that penetrates from the inner surface 1a of the mold 1 to the outside and a medium-diameter through hole 2b that are stepped. In each of the vent holes 2, a cylindrical holder 4 integrally formed of a heat-resistant metal material such as stainless steel or aluminum alloy as shown in FIGS. 2 and 3, and the holder A plug 3 comprising a plug member 5 integrally formed of a heat resistant resin material (for example, polytetrafluoroethylene having a Shore hardness of D50 to D65) fitted in the exhaust cylinder portion 4a of 4 is detachably mounted. It is.

前記金属製のホルダ４は、径大軸筒部４ｘと、これに連続するスリット６を形成したテーパー状の軸筒部４ｙとで構成し、中央部に形成した排気筒部４ａの側面に下部の排気穴４ｂに連通する前記スリット６を形成すると共に、排気筒部４ａの底部には、前記栓部材５の底面が当接する係止部７を形成し、更に排気筒部４ａの上部にテーパー状の嵌合部８が形成してある。   The metal holder 4 is composed of a large-diameter shaft cylinder portion 4x and a tapered shaft cylinder portion 4y formed with a slit 6 continuous therewith, and a lower portion on the side surface of the exhaust cylinder portion 4a formed in the center portion. The slit 6 that communicates with the exhaust hole 4b is formed, and a locking portion 7 with which the bottom surface of the plug member 5 abuts is formed at the bottom of the exhaust cylinder 4a, and further tapered at the top of the exhaust cylinder 4a. A shaped fitting portion 8 is formed.

このテーパー状の嵌合部８の傾斜角度α１は、この実施形態では、２０°前後に形成してあるが、この角度に限定されるものではない。   In this embodiment, the inclination angle α1 of the tapered fitting portion 8 is formed around 20 °, but is not limited to this angle.

また、前記栓部材５は、前記ホルダ４のテーパー状の嵌合部８に嵌合する皿状のヘッド部５ａと、弾性変形可能な軸部５ｂと、前記係止部７に当接する径大軸部５ｃとで構成され、テーパー状の嵌合部８に嵌合する皿状のヘッド部５ａの傾斜角度α２としては、この実施形態では２５°前後に形成してあるが、この角度に限定されるものではない。   The plug member 5 has a large diameter in contact with the dish-shaped head portion 5 a that fits into the tapered fitting portion 8 of the holder 4, an elastically deformable shaft portion 5 b, and the locking portion 7. In this embodiment, the inclination angle α2 of the dish-shaped head portion 5a that is configured by the shaft portion 5c and fits into the tapered fitting portion 8 is formed to be around 25 °, but is limited to this angle. Is not to be done.

なお、タイヤＷの挿入前には、図４及び図５に示すように、前記金属製のホルダ４のテーパー状の嵌合部８と、栓部材５の皿状のヘッド部５ａとの間には、タイヤ加硫時にエアーは流れるが、ゴムが流れ込まない0.02〜2.0mm の間隙Ｈが形成される。金型内のエアーは、前記間隙Ｈを通ってホルダ４と栓部材５との隙間からスリット６に入り、排気筒部４ａの下部の排気穴４ｂから金型外部に排気される。   Before inserting the tire W, as shown in FIGS. 4 and 5, between the tapered fitting portion 8 of the metal holder 4 and the dish-like head portion 5 a of the plug member 5. In this case, air flows during tire vulcanization, but a gap H of 0.02 to 2.0 mm is formed in which rubber does not flow. The air in the mold passes through the gap H, enters the slit 6 through the gap between the holder 4 and the plug member 5, and is exhausted to the outside of the mold from the exhaust hole 4b below the exhaust cylinder portion 4a.

またタイヤＷの挿入後には、図６及び図７に示すように、タイヤＷの押圧力により皿状のヘッド部５ａが排気筒部４ａ内側に押圧されて栓部材５の底面が金属製のホルダ４の係止部７に当接し、耐熱性樹脂材料で一体的に成形された弾性変形可能な軸部５ｂが径方向に膨出して収縮することによりホルダ４のテーパー状の嵌合部８に皿状のヘッド部５ａが密着して排気筒部４ａの上部開口部を閉鎖する。これにより、加硫時に溶融したゴム材料は排気筒部４ａ内に流れ込むことはない。   6 and 7, after the tire W is inserted, the dish-like head portion 5a is pressed inside the exhaust tube portion 4a by the pressing force of the tire W, and the bottom surface of the plug member 5 is a metal holder. 4, the elastically deformable shaft portion 5b formed integrally with the heat-resistant resin material bulges and contracts in the radial direction, so that the tapered fitting portion 8 of the holder 4 is brought into contact. The dish-shaped head portion 5a is brought into close contact with the upper opening portion of the exhaust tube portion 4a. Thereby, the rubber material melted at the time of vulcanization does not flow into the exhaust cylinder portion 4a.

次に、図８（ａ），（ｂ），（ｃ）〜図１０（ａ），（ｂ），（ｃ）は、この発明の他の参考例及び実施形態を示している。上記の参考例が金属製のホルダ４に排気穴４ｂに連通する前記スリット６を形成したのに対して、前記栓部材５の弾性変形可能な軸部５ｂの内部または外周面の一部に、前記排気筒部４ａの底面の排気穴４ｂに接続する排気経路９を形成したものである。 Next, FIGS. 8 (a), (b), and (c) to FIGS. 10 (a), (b), and (c) show other reference examples and embodiments of the present invention. Whereas Reference example above is the formation of the slit 6 that communicates with the exhaust hole 4b in the holder 4 made of metal, a portion of the inner or outer peripheral surface of the elastically deformable shank 5b of the plug member 5 The exhaust path 9 connected to the exhaust hole 4b on the bottom surface of the exhaust cylinder portion 4a is formed.

即ち、図８（ａ），（ｂ），（ｃ）に示す参考例は、栓部材５の径大軸部５ｃの外周面の長手方向の対称位置と底面とに、排気経路９を構成する排気溝９ａを形成したものである。 That is, in the reference example shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, the exhaust passage 9 is configured at the symmetrical position and the bottom surface of the outer peripheral surface of the large-diameter shaft portion 5 c of the plug member 5. An exhaust groove 9a is formed.

図９（ａ），（ｂ），（ｃ）に示す本発明の実施形態は、栓部材５の軸部５ｂ及び径大軸部５ｃに、排気経路９を構成する横向きの排気穴９ｂと縦向きの排気穴９ｃとを連通させて形成したものである。 Figure 9 (a), (b) , an embodiment of the present invention shown in (c) is a shaft portion 5b and large diameter shaft portion 5c of the plug member 5, lateral exhaust hole 9b and vertical constituting the exhaust path 9 It is formed by communicating with the exhaust hole 9c in the direction.

また、図１０（ａ），（ｂ），（ｃ）に示す参考例は、図８（ａ），（ｂ），（ｃ）に示す参考例の変形例として、栓部材５の軸部５ｂと径大軸部５ｃとの外周面に、排気経路９を構成する排気溝９ｄを形成したものである。 Moreover , the reference example shown to FIG. 10 (a), (b), (c) is the axial part 5b of the plug member 5 as a modification of the reference example shown to FIG. 8 (a), (b), (c). And an exhaust groove 9d constituting the exhaust passage 9 are formed on the outer peripheral surface of the large diameter shaft portion 5c.

このように、栓部材５の弾性変形可能な軸部５ｂの内部または外周面の一部に、前記排気筒部４ａの側面の排気穴４ｂに接続する排気経路９を形成したものであっても、上記の最初の参考例と同様な排気効率を得ることが可能である。 Thus, even if the exhaust passage 9 connected to the exhaust hole 4b on the side surface of the exhaust cylinder portion 4a is formed in the elastically deformable shaft portion 5b of the plug member 5 or in a part of the outer peripheral surface. It is possible to obtain the same exhaust efficiency as in the first reference example .

また、金属製のホルダ４に排気穴４ｂに連通する前記スリット６を形成すると共に、栓部材５の弾性変形可能な軸部５ｂの内部または外周面の一部に、前記排気筒部４ａの側面の排気穴４ｂに接続する排気経路９を併用して形成することも可能である。   Further, the slit 6 that communicates with the exhaust hole 4 b is formed in the metal holder 4, and the side surface of the exhaust cylinder portion 4 a is formed on the inside or part of the outer peripheral surface of the elastically deformable shaft portion 5 b of the plug member 5. It is also possible to form the exhaust passage 9 connected to the exhaust hole 4b together.

図１１及び図１２は、金属製のホルダ４の内面と栓部材５の外面寸法の関係の一実施例を示し、座面深さ（Ｌ）のホルダ４には、排気穴４ｂに連通するテーパー状の排気筒部４ａが形成され、この排気筒部４ａの内径（Ｄ）、上部側内径（Ｄ１）、下部側内径（Ｄ２）に形成されている。   11 and 12 show an example of the relationship between the inner surface of the metal holder 4 and the outer surface dimension of the plug member 5, and the holder 4 having a seating surface depth (L) has a taper communicating with the exhaust hole 4b. An exhaust cylinder portion 4a is formed, and the exhaust cylinder portion 4a has an inner diameter (D), an upper-side inner diameter (D1), and a lower-side inner diameter (D2).

一方、耐熱性樹脂材料（ショアー硬度がＤ５０〜６５の例えば、ポリテトラ フルオロ エチレン）により一体的に形成された高さ（ｌ）の栓部材５は、外径（ｄ）、上部外径（ｄ１）、下部外径（ｄ２）で形成されている。そして、金属製のホルダ４の内面と栓部材５の外面寸法の関係を以下のように設定することにより、種々の効果を得ることが出来るものである。   On the other hand, the plug member 5 having a height (l) integrally formed of a heat-resistant resin material (for example, polytetrafluoroethylene having a Shore hardness of D50 to D65) has an outer diameter (d) and an upper outer diameter (d1). The lower outer diameter (d2) is formed. And various effects can be acquired by setting the relationship between the inner surface of the metal holder 4 and the outer surface dimension of the plug member 5 as follows.

即ち、金属製のホルダ４の座面深さ（Ｌ）＜栓部材５の高さ（ｌ）に設定した場合には、ホルダ４内へのエアーの取り込みを確実に行うことが出来る。また、排気筒部４ａの内径（Ｄ）≦栓部材５の外径（ｄ）に設定した場合には、ホルダ４内へのゴムの侵入を確実に防止することが出来る。また、排気筒部４ａの上部側内径（Ｄ１）＞栓部材５の上部外径（ｄ１）に設定した場合には、ゴム材料の押圧力により栓部材５の圧縮変形を容易にすることが出来る。更に、排気筒部４ａの下部側内径（Ｄ２）＜栓部材５の下部外径（ｄ２）に設定した場合には、栓部材５のホルダ４からの脱落を防止することが出来るものである。   That is, when the seating surface depth (L) of the metal holder 4 is set to be less than the height (l) of the plug member 5, the air can be reliably taken into the holder 4. Further, when the inner diameter (D) of the exhaust cylinder portion 4 a ≦ the outer diameter (d) of the plug member 5 is set, it is possible to reliably prevent rubber from entering the holder 4. Further, when the upper side inner diameter (D1) of the exhaust cylinder portion 4a is set to the upper outer diameter (d1) of the plug member 5, the compression deformation of the plug member 5 can be facilitated by the pressing force of the rubber material. . Further, when the lower side inner diameter (D2) of the exhaust cylinder part 4a <the lower outer diameter (d2) of the plug member 5 is set, the plug member 5 can be prevented from falling off the holder 4.

上記のように、多数のベントホール２に金属製のホルダ４と樹脂製の栓部材５とから成るプラグ３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１内へのタイヤ挿入前は、ホルダ４と栓部材５との隙間からスリット６に入り、排気筒部４ａの下部の排気穴４ｂから金型外部に排気される。   As described above, when the tire W is molded by the mold 1 in which the plugs 3 each including the metal holder 4 and the resin plug member 5 are mounted in the large number of vent holes 2, as described above, the mold 1 Before inserting the tire into the inside, the slit 6 enters through the gap between the holder 4 and the plug member 5, and the exhaust is exhausted from the exhaust hole 4b at the lower part of the exhaust cylinder portion 4a to the outside of the mold.

またタイヤＷの挿入後は、タイヤ１の圧力によりホルダ４のテーパー状の嵌合部８に皿状のヘッド部５ａが密着して排気筒部４ａの上部開口部を閉鎖するので、タイヤ加硫時における溶融状態の加硫ゴムは、排気筒部４ａやベントホール２内に流れ込むことはなく、従ってスピューの発生はないので、図１３に示すような表面を平滑に成形した外観の良好なタイヤを製造することが出来るのである。 After the tire W is inserted, the dish-shaped head portion 5a is brought into close contact with the tapered fitting portion 8 of the holder 4 due to the pressure of the tire 1 to close the upper opening of the exhaust tube portion 4a. vulcanized rubber in the molten state during does not flow into the exhaust tube portion 4a and the vent hole 2, thus the occurrence of spew at the a, Ino, good appearance molded smooth surface as shown in FIG. 13 Tires can be manufactured.

この発明の参考例であるタイヤ成形金型の一部拡大断面図である。Is a partially enlarged cross-sectional view of the tire molding die is a reference example of the invention of this. 金属製のホルダの拡大断面図である。It is an expanded sectional view of a metal holder. 樹脂製の栓部材の拡大正面図である。It is an enlarged front view of a resin plug member. タイヤ挿入前のホルダと栓部材との関係を示す一部拡大正面図である。It is a partially expanded front view which shows the relationship between the holder before a tire insertion, and a plug member. 図４の要部拡大断面図である。It is a principal part expanded sectional view of FIG. タイヤ挿入後のホルダと栓部材との関係を示す一部拡大正面図である。It is a partially expanded front view which shows the relationship between the holder and tire plug member after tire insertion. 図６の要部拡大断面図である。It is a principal part expanded sectional view of FIG. この発明の他の参考例を示し、（ａ）はホルダと栓部材との縦断正面図、（ｂ）はホルダと栓部材との縦断側面図、（ｃ）はＸ−Ｘ矢視平面図である。It shows another reference example of the invention of this, (a) represents longitudinal sectional front view of the holder and plug member, (b) is a vertical sectional side view of the holder and plug member, (c) the X-X palm plan view It is. この発明の実施形態を示し、（ａ）はホルダと栓部材との縦断正面図、（ｂ）はホルダと栓部材との縦断側面図、（ｃ）はＸ−Ｘ矢視平面図である。Shows the implementation form of this invention, (a) represents longitudinal sectional front view of the holder and plug member, (b) is a vertical sectional side view of the holder and plug member, (c) in the X-X palm plan view is there. この発明の更に他の参考例を示し、（ａ）はホルダと栓部材との縦断正面図、（ｂ）はホルダと栓部材との縦断側面図、（ｃ）はＸ−Ｘ矢視平面図である。Shows another reference example of this invention, (a) represents longitudinal sectional front view of the holder and plug member, (b) is a vertical sectional side view of the holder and plug member, (c) the X-X palm plane FIG. 金属製のホルダの内面と栓部材の外面寸法の関係を示すホルダの断面図である。It is sectional drawing of the holder which shows the relationship between the inner surface of metal holders, and the outer surface dimension of a plug member. 金属製のホルダの内面と栓部材の外面寸法の関係を示す栓部材の断面図である。It is sectional drawing of the plug member which shows the relationship between the inner surface of metal holders, and the outer surface dimension of a plug member. この発明のタイヤ成形金型で製造されたタイヤの一部斜視図である。It is a partial perspective view of the tire manufactured with the tire molding die of this invention.

符号の説明Explanation of symbols

Ｗ タイヤ
１ 金型 １ａ 金型の内面
２ ベントホール ２ａ，２ｂ 貫通穴
３ プラグ ４ ホルダ
４ｘ 径大軸筒部 ４ｙ 軸筒部
４ａ 排気筒部 ４ｂ 排気穴
５ 栓部材 ６ スリット
α１，α２ 傾斜角度 ５ａ ヘッド部
５ｂ 軸部 ５ｃ 径大軸部
７ 係止部 ８ 嵌合部
９ 排気経路 ９ａ 排気溝
９ｂ 排気穴 ９ｃ 排気穴
９ｄ 排気溝
W tire 1 mold 1a inner surface of mold 2 vent hole 2a, 2b through-hole 3 plug 4 holder 4x large diameter cylinder 4y shaft cylinder 4a exhaust cylinder 4b exhaust hole 5 plug member 6 slit α1, α2 inclination angle 5a Head portion 5b Shaft portion 5c Large diameter shaft portion 7 Locking portion 8 Fitting portion 9 Exhaust path 9a Exhaust groove 9b Exhaust hole 9c Exhaust hole 9d Exhaust groove

Claims (4)

複数の貫通穴（２ａ）からなるベントホール（２）にプラグ（３）を装着したタイヤ成形金型（１）において、
前記プラグ（３）を、
上端にテーパー凹状の嵌合部（８）を有しかつ前記貫通穴（２ａ）に嵌合する径大軸筒部（４ｘ）と、底面に排気穴（４ｂ）を有する小径の筒軸部（４ｙ）とを接続し、その側面に前記排気穴（４ｂ）に連通するスリット（６）を形成してなる金属製の筒状のホルダ（４）内に、
棒状の小径の軸部（５ｂ）の一端に前記嵌合部（８）に嵌合する皿状のヘッド部（５ａ）を、他端に前記ホルダ（４）に嵌合する径大軸部（５ｃ）をそれぞれ設けると共に、前記軸部（５ｂ）の側面から前記径大軸部（５ｃ）の端面へ通じる排気穴（９ｂ、９ｃ）を形成してなる樹脂製の栓部材（５）を、
前記径大軸部（５ｃ）が前記筒軸部（４ｙ）の底面である係止部（７）に当接するようにして挿入し、
前記ヘッド部（５ａ）に圧力が加わると、前記軸部（５ｂ）の弾性変形により該ヘッド部（５ａ）が前記嵌合部（８）に密着するように構成すると共に、
該プラグ（３）を前記ベントホール（２）に前記ヘッド部（５ａ）が内側を向くように装着したことを特徴とするタイヤ成形金型。 In the tire molding die (1) in which the plug (3) is attached to the vent hole (2) including a plurality of through holes (2a),
The plug (3)
A small-diameter cylindrical shaft portion (4x) having a tapered concave fitting portion (8) at the upper end and fitting in the through hole (2a) and a small-diameter cylindrical shaft portion (4b) in the bottom surface (4b). 4y) in a metal cylindrical holder (4) formed by forming a slit (6) communicating with the exhaust hole (4b) on the side surface thereof,
A dish-like head portion (5a) that fits into the fitting portion (8) at one end of a rod-like small-diameter shaft portion (5b), and a large-diameter shaft portion that fits into the holder (4) at the other end. 5c) and a resin plug member (5) formed by forming exhaust holes (9b, 9c) from the side surface of the shaft portion (5b) to the end surface of the large-diameter shaft portion (5c),
The large diameter shaft portion (5c) is inserted so as to abut on the locking portion (7) which is the bottom surface of the cylindrical shaft portion (4y),
When pressure is applied to the head part (5a), the head part (5a) is configured to be in close contact with the fitting part (8) by elastic deformation of the shaft part (5b), and
A tire molding die, wherein the plug (3) is attached to the vent hole (2) so that the head portion (5a) faces inward . 前記栓部材（５）が、ショアー硬度がＤ５０〜６５である耐熱性樹脂から形成されている請求項１に記載のタイヤ成形金型。The tire molding die according to claim 1, wherein the plug member (5) is formed of a heat resistant resin having a Shore hardness of D50 to 65. タイヤ成形金型（１）に形成された複数の貫通穴（２ａ）からなるベントホール（２）に装着するタイヤ成形金型用のプラグ（３）であって、A tire molding die plug (3) to be attached to a vent hole (2) comprising a plurality of through holes (2a) formed in a tire molding die (1),
上端にテーパー凹状の嵌合部（８）を有しかつ前記貫通穴（２ａ）に嵌合する径大軸筒部（４ｘ）と、底面に排気穴（４ｂ）を有する小径の筒軸部（４ｙ）とを接続し、その側面に前記排気穴（４ｂ）に連通するスリット（６）を形成してなる金属製の筒状のホルダ（４）内に、A small-diameter cylindrical shaft portion (4x) having a tapered concave fitting portion (8) at the upper end and fitting in the through hole (2a) and a small-diameter cylindrical shaft portion (4b) in the bottom surface (4b). 4y) in a metal cylindrical holder (4) formed by forming a slit (6) communicating with the exhaust hole (4b) on the side surface thereof,
棒状の小径の軸部（５ｂ）の一端に前記嵌合部（８）に嵌合する皿状のヘッド部（５ａ）を、他端に前記ホルダ（４）に嵌合する径大軸部（５ｃ）をそれぞれ設けると共に、前記軸部（５ｂ）の側面から前記径大軸部（５ｃ）の端面へ通じる排気穴（９ｂ、９ｃ）を形成してなる樹脂製の栓部材（５）を、A dish-like head portion (5a) that fits into the fitting portion (8) at one end of a rod-like small-diameter shaft portion (5b), and a large-diameter shaft portion that fits into the holder (4) at the other end. 5c) and a resin plug member (5) formed by forming exhaust holes (9b, 9c) from the side surface of the shaft portion (5b) to the end surface of the large-diameter shaft portion (5c),
前記径大軸部（５ｃ）が前記筒軸部（４ｙ）の底面である係止部（７）に当接するようにして挿入し、The large diameter shaft portion (5c) is inserted so as to abut on the locking portion (7) which is the bottom surface of the cylindrical shaft portion (4y),
前記ヘッド部（５ａ）に圧力が加わると、前記軸部（５ｂ）の弾性変形により該ヘッド部（５ａ）が前記嵌合部（８）に密着するように構成したことを特徴とするタイヤ成形金型用のプラグ。The tire molding is characterized in that when pressure is applied to the head portion (5a), the head portion (5a) is brought into close contact with the fitting portion (8) by elastic deformation of the shaft portion (5b). Plug for mold. 前記栓部材（５）が、ショアー硬度がＤ５０〜６５である耐熱性樹脂から形成されている請求項３に記載のタイヤ成形金型用のプラグ。The plug for a tire molding die according to claim 3, wherein the plug member (5) is formed of a heat resistant resin having a Shore hardness of D50 to D65.
JP2004363917A 2004-12-16 2004-12-16 Tire molding die and plug for tire molding die Expired - Fee Related JP4501671B2 (en)

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JP5206062B2 (en) * 2008-03-25 2013-06-12 横浜ゴム株式会社 Exhaust device for tire vulcanization mold
JP5291976B2 (en) * 2008-04-21 2013-09-18 東洋ゴム工業株式会社 Vent plug for tire vulcanization mold, tire vulcanization mold, and method for manufacturing pneumatic tire using tire vulcanization mold
JP4709882B2 (en) * 2008-09-24 2011-06-29 住友ゴム工業株式会社 Mold for tire
JP5227266B2 (en) * 2009-06-05 2013-07-03 東洋ゴム工業株式会社 Tire vulcanizing mold
JP5090408B2 (en) 2009-07-22 2012-12-05 インターナショナル・ビジネス・マシーンズ・コーポレーション Method and apparatus for dynamically controlling destination of transmission data in network communication
US8834143B2 (en) * 2011-02-24 2014-09-16 The Yokohama Rubber Co., Ltd. Tire vulcanization mold
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JP6750397B2 (en) * 2016-08-24 2020-09-02 住友ゴム工業株式会社 Tire mold
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