JP6655969B2 - Rubber article mold and rubber article molding apparatus - Google Patents

Rubber article mold and rubber article molding apparatus Download PDF

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JP6655969B2
JP6655969B2 JP2015238015A JP2015238015A JP6655969B2 JP 6655969 B2 JP6655969 B2 JP 6655969B2 JP 2015238015 A JP2015238015 A JP 2015238015A JP 2015238015 A JP2015238015 A JP 2015238015A JP 6655969 B2 JP6655969 B2 JP 6655969B2
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mold
molding
rubber article
split
tire
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JP2017100432A (en
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石原 泰之
泰之 石原
優 分部
優 分部
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Bridgestone Corp
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Description

本発明は、複数の分割モールドを備えたゴム物品用モールドと、ゴム物品用モールドを備えたゴム物品の成形装置に関する。   The present invention relates to a rubber article mold provided with a plurality of split molds and a rubber article molding apparatus provided with the rubber article mold.

複数の分割モールドを備えたゴム物品用モールドにおいては、複数の分割モールドが組み合わされて、複数の分割モールドによりゴム物品が加熱しつつ成形される。例えば、分割モールドは、アルミニウム合金製であり、鋳造、又は、機械加工により製作される。また、ゴム物品がタイヤであるときには、複数の分割モールドは、タイヤ周方向(モールド周方向)に分割され、リング状に組み合わされて、内側の成形面によりタイヤのトレッド部を成形する。   In a rubber article mold provided with a plurality of division molds, a plurality of division molds are combined, and a rubber article is formed while being heated by the plurality of division molds. For example, the split mold is made of an aluminum alloy and is manufactured by casting or machining. When the rubber article is a tire, the plurality of split molds are split in the tire circumferential direction (mold circumferential direction) and are combined in a ring shape to form the tread portion of the tire with the inner forming surface.

分割モールドの分割位置で、分割モールドの分割面の間に隙間があるときには、分割面の間の隙間にゴム物品のゴムがはみ出し、ゴム物品にバリが生じることがある。これに対し、ゴム物品の成形時に、分割モールドの分割面を密着させることで、ゴム物品のはみ出しが規制される。ところが、分割モールドの材質や熱膨張量によっては、ゴム物品の成形の繰り返しに伴い、分割モールドの分割面の変形が進行して、分割モールドの分割面の間に隙間が生じることがある。   When there is a gap between the division surfaces of the division mold at the division position of the division mold, the rubber of the rubber article may protrude into the gap between the division surfaces, and burrs may be generated on the rubber article. On the other hand, when the rubber article is molded, the protrusion of the rubber article is regulated by bringing the divided surfaces of the split mold into close contact with each other. However, depending on the material and the amount of thermal expansion of the split mold, the deformation of the split surface of the split mold progresses as the molding of the rubber article is repeated, and a gap may be generated between the split surfaces of the split mold.

そこで、従来、セグメント(分割モールド)の熱膨張を見込んで、分割モールドの分割面の間に予め隙間を設け、ゴム物品の成形時に、分割モールドの熱膨張により、分割モールドの分割面を密着させるタイヤ加硫金型が知られている(特許文献1参照)。
しかしながら、特許文献1に記載された従来のタイヤ加硫金型でも、分割モールドの分割面に力が繰り返し加えられて、分割モールドの分割面が次第に変形する虞がある。また、分割モールドの分割面の変形が成形面側で進行して、分割面の隙間が次第に大きくなる虞もある。従って、従来のタイヤ加硫金型に関しては、分割モールドの寿命をより向上させる観点から、改良が求められる。
Therefore, conventionally, in consideration of the thermal expansion of the segment (divided mold), a gap is provided in advance between the divided surfaces of the divided mold, and when the rubber article is molded, the divided surfaces of the divided mold are brought into close contact with each other by the thermal expansion of the divided mold. A tire vulcanizing mold is known (see Patent Document 1).
However, even in the conventional tire vulcanizing mold described in Patent Literature 1, there is a possibility that a force is repeatedly applied to the divided surface of the divided mold, and the divided surface of the divided mold is gradually deformed. In addition, the deformation of the split surface of the split mold may progress on the molding surface side, and the gap between the split surfaces may gradually increase. Therefore, with respect to the conventional tire vulcanization mold, improvement is required from the viewpoint of further improving the life of the split mold.

特開2013−95096号公報JP 2013-95096 A

本発明は、前記従来の問題に鑑みなされたもので、その目的は、ゴム物品用モールドに設けられる分割モールドの分割面の変形を抑制して、ゴム物品のはみ出しを規制するとともに、分割モールドの寿命を向上させることである。   The present invention has been made in view of the conventional problems described above, and has as its object to suppress deformation of a division surface of a division mold provided in a rubber article mold, to regulate protrusion of a rubber article, and It is to improve the life.

本発明は、分割面を密着させてリング状に組み合わされて、ゴム物品を加熱しつつ成形する複数の分割モールドと、複数の分割モールドと組み合わされるサイドモールドを備えたゴム物品用モールドである。ゴム物品は、複数の分割モールドによりトレッド部が成形されるとともにサイドモールドによりサイド部が成形されるタイヤである。複数の分割モールドのそれぞれは、ゴム物品を成形する成形部材と、成形部材を支持する支持部材を有する。複数の分割モールドの成形部材は、ゴム物品の成形時に、分割モールドの分割位置で、支持部材の分割面が密着した状態で互いの分割面を密着させて、ゴム物品のはみ出しを規制する。室温でサイドモールドと複数の分割モールドを組み合わせた状態で、サイドモールドと支持部材が密着し、サイドモールドと成形部材の間に隙間が形成される。ゴム物品の成形時に、サイドモールドと成形部材がそれぞれ熱膨張した状態で、サイドモールドと成形部材が密着して、成形部材とサイドモールドの間へのゴム物品のはみ出しを規制する。
また、本発明は、ゴム物品用モールドを備えたゴム物品の成形装置である。
The present invention is a rubber article mold provided with a plurality of split molds that are combined in a ring shape with the divided surfaces brought into close contact with each other and molded while heating a rubber article, and a side mold combined with the plurality of split molds . The rubber article is a tire in which a tread portion is formed by a plurality of split molds and a side portion is formed by a side mold. Each of the plurality of split molds has a molding member for molding a rubber article and a support member for supporting the molding member. The molding members of the plurality of split molds regulate the protrusion of the rubber article by bringing the divided surfaces of the support member into close contact with each other at the dividing position of the split mold when the rubber article is molded. In a state where the side mold and the plurality of split molds are combined at room temperature, the side mold and the support member adhere to each other, and a gap is formed between the side mold and the molded member. During molding of the rubber article, the side mold and the molding member are in close contact with each other in a state where the side mold and the molding member are thermally expanded, thereby restricting the protrusion of the rubber article between the molding member and the side mold.
Further, the present invention is a rubber article molding apparatus provided with a rubber article mold.

本発明によれば、ゴム物品用モールドに設けられる分割モールドの分割面の変形を抑制することができ、ゴム物品のはみ出しを規制するとともに、分割モールドの寿命を向上させることができる。   ADVANTAGE OF THE INVENTION According to this invention, the deformation | transformation of the division | segmentation surface of the division | segmentation mold provided in a mold for rubber articles can be suppressed, the protrusion of a rubber article can be controlled, and the life of the division | segmentation mold can be improved.

本実施形態のゴム物品の成形装置を示す断面図である。It is sectional drawing which shows the shaping | molding apparatus of the rubber article of this embodiment. 本実施形態のゴム物品の成形装置を示す断面図である。It is sectional drawing which shows the shaping | molding apparatus of the rubber article of this embodiment. 図1のX−X線で切断した複数の分割モールドと可動部材を示す断面図である。FIG. 2 is a cross-sectional view illustrating a plurality of divided molds and a movable member taken along line XX in FIG. 1. 図1のX−X線で切断した複数の分割モールドと可動部材を示す断面図である。FIG. 2 is a cross-sectional view illustrating a plurality of divided molds and a movable member taken along line XX in FIG. 1. 他の実施形態のゴム物品用モールドを示す図である。It is a figure showing a mold for rubber articles of other embodiments.

本発明のゴム物品用モールド、及び、ゴム物品の成形装置の一実施形態について、図面を参照して説明する。
本実施形態のゴム物品用モールドは、ゴム物品(ゴム製の物品)を成形するゴム成形用モールドであり、本実施形態のゴム物品の成形装置に設けられる。以下では、ゴム物品用モールドがタイヤ用モールド(タイヤ成形用モールド)である場合を例にとり、ゴム物品用モールド(以下、単に、モールドという)とゴム物品の成形装置について説明する。従って、ゴム物品はタイヤであり、ゴム物品の成形装置はタイヤ成形装置である。モールドは、タイヤの成形時(加硫時)にタイヤ用モールドとして用いられて、タイヤを成形する。
An embodiment of a rubber article mold and a rubber article molding apparatus according to the present invention will be described with reference to the drawings.
The rubber article mold of the present embodiment is a rubber molding mold for molding a rubber article (rubber article), and is provided in the rubber article molding apparatus of the present embodiment. Hereinafter, a rubber article mold (hereinafter, simply referred to as a mold) and a rubber article molding apparatus will be described taking a case where the rubber article mold is a tire mold (tire molding mold) as an example. Accordingly, the rubber article is a tire, and the molding apparatus for the rubber article is a tire molding apparatus. The mold is used as a tire mold at the time of molding the tire (at the time of vulcanization) to mold the tire.

図1、図2は、本実施形態のゴム物品の成形装置(タイヤ成形装置1)を示す断面図であり、タイヤ2の幅方向(タイヤ幅方向W)に切断したタイヤ成形装置1及びタイヤ2を示している。また、図1は、閉じた状態のタイヤ成形装置1の一部を示し、図2は、開いた状態のタイヤ成形装置1の一部を示している。
図示のように、タイヤ成形装置1は、タイヤ2を収容するリング状のモールド3と、膨張可能なブラダ4と、モールド3を開閉する開閉機構10を備えている。タイヤ成形装置1は、モールド3内のタイヤ2を加熱して加硫するとともに、モールド3によりタイヤ2を成形する。
FIG. 1 and FIG. 2 are cross-sectional views showing a rubber article molding apparatus (tire molding apparatus 1) of the present embodiment, and show a tire molding apparatus 1 and a tire 2 cut in the width direction of the tire 2 (tire width direction W). Is shown. FIG. 1 shows a part of the tire building apparatus 1 in a closed state, and FIG. 2 shows a part of the tire building apparatus 1 in an opened state.
As shown in the figure, the tire forming apparatus 1 includes a ring-shaped mold 3 for accommodating the tire 2, an inflatable bladder 4, and an opening / closing mechanism 10 for opening and closing the mold 3. The tire forming apparatus 1 heats and vulcanizes the tire 2 in the mold 3 and forms the tire 2 with the mold 3.

モールド3は、タイヤ2の外面を成形する外型であり、一対のリング状のサイドモールド20、21(上サイドモールド20、下サイドモールド21)と、複数の分割モールド5を備えている。上サイドモールド20と下サイドモールド21は、それぞれタイヤ2のサイド部2Aに接触するサイド成形面20A、21Aを有し、サイド成形面20A、21Aにより、サイド部2Aを成形する。   The mold 3 is an outer mold for molding the outer surface of the tire 2, and includes a pair of ring-shaped side molds 20 and 21 (an upper side mold 20 and a lower side mold 21) and a plurality of split molds 5. The upper side mold 20 and the lower side mold 21 have side molding surfaces 20A and 21A, respectively, that come into contact with the side portions 2A of the tire 2, and the side molding surfaces 20A and 21A form the side portions 2A.

複数の分割モールド5は、モールド3の周方向(モールド周方向)に分割されたセグメントであり、かつ、タイヤ2のトレッド部2Bを成形するトレッドモールドである。モールド周方向は、タイヤ2の周方向(タイヤ周方向)に一致する。複数の分割モールド5は、それぞれタイヤ2のトレッド部2Bに接触するトレッド成形面5Aを有し、リング状に組み合わされた状態で、トレッド成形面5Aにより、トレッド部2Bを成形する。   The plurality of split molds 5 are segments divided in the circumferential direction of the mold 3 (mold circumferential direction), and are tread molds for forming the tread portion 2B of the tire 2. The circumferential direction of the mold coincides with the circumferential direction of the tire 2 (tire circumferential direction). Each of the plurality of split molds 5 has a tread forming surface 5A that comes into contact with the tread portion 2B of the tire 2, and forms the tread portion 2B with the tread forming surface 5A in a state of being combined in a ring shape.

タイヤ成形装置1は、ブラダ4の端部を保持する保持リング6と、ブラダ4内にガスを供給する供給装置(図示せず)を備え、ガスによりブラダ4を膨張させる。ブラダ4は、タイヤ2内に配置されて、ガスにより膨張し、タイヤ2の内面に接触する。タイヤ2の成形時に、タイヤ成形装置1は、膨張したブラダ4により、タイヤ2を加圧して、タイヤ2をモールド3の成形面(サイド成形面20A、21A、トレッド成形面5A)に押し付ける。また、タイヤ2の成形後に、ブラダ4からガスが排出されて、ブラダ4が収縮する。   The tire forming apparatus 1 includes a holding ring 6 that holds an end of the bladder 4 and a supply device (not shown) that supplies gas into the bladder 4, and the bladder 4 is inflated by the gas. The bladder 4 is arranged in the tire 2, inflated by gas, and comes into contact with the inner surface of the tire 2. When molding the tire 2, the tire molding apparatus 1 presses the tire 2 with the inflated bladder 4, and presses the tire 2 against the molding surfaces (side molding surfaces 20A and 21A, tread molding surface 5A) of the mold 3. After the tire 2 is formed, gas is discharged from the bladder 4 and the bladder 4 contracts.

開閉機構10は、上プレート11と、下プレート12と、上プレート11に固定された円筒状のアウターリング13と、複数の可動部材14を有する。移動装置(図示せず)により、上プレート11が下プレート12の上方で上下方向(タイヤ幅方向W)に移動して、上プレート11と下プレート12が接近及び離間する。モールド3は、上プレート11と下プレート12の間に配置されて、上プレート11と下プレート12に連結される。具体的には、上サイドモールド20は、上プレート11に取り付けられて、上プレート11と一体に移動する。また、下サイドモールド21は、下プレート12に取り付けられる。   The opening / closing mechanism 10 includes an upper plate 11, a lower plate 12, a cylindrical outer ring 13 fixed to the upper plate 11, and a plurality of movable members 14. The upper plate 11 moves in the vertical direction (tire width direction W) above the lower plate 12 by a moving device (not shown), and the upper plate 11 and the lower plate 12 approach and separate from each other. The mold 3 is disposed between the upper plate 11 and the lower plate 12, and is connected to the upper plate 11 and the lower plate 12. Specifically, the upper side mold 20 is attached to the upper plate 11 and moves integrally with the upper plate 11. The lower side mold 21 is attached to the lower plate 12.

アウターリング13は、モールド3と複数の可動部材14を囲み、上プレート11と一体に移動する。複数の可動部材14は、それぞれアウターリング13の内周部(ガイド部13A)に移動可能に連結され、アウターリング13の移動に伴い、アウターリング13のガイド部13Aによりガイドされて、モールド3の半径方向(モールド半径方向H)に移動する。モールド半径方向Hは、タイヤ2の半径方向(タイヤ半径方向)に一致する。複数の分割モールド5は、それぞれ可動部材14に取り付けられて、可動部材14と一体にモールド半径方向Hに移動する。移動時には、複数の可動部材14が下プレート12の上面をスライドして、複数の可動部材14及び分割モールド5が放射状に移動する。これにより、複数の可動部材14がモールド周方向に接近及び離間する。   The outer ring 13 surrounds the mold 3 and the plurality of movable members 14 and moves integrally with the upper plate 11. The plurality of movable members 14 are movably connected to the inner peripheral portion (guide portion 13A) of the outer ring 13, respectively, and are guided by the guide portion 13A of the outer ring 13 with the movement of the outer ring 13, thereby forming the mold 3. It moves in the radial direction (mold radial direction H). The mold radial direction H matches the radial direction of the tire 2 (tire radial direction). The plurality of split molds 5 are respectively attached to the movable members 14 and move in the mold radial direction H integrally with the movable members 14. During movement, the plurality of movable members 14 slide on the upper surface of the lower plate 12, and the plurality of movable members 14 and the split mold 5 move radially. Thereby, the plurality of movable members 14 approach and separate in the mold circumferential direction.

開閉機構10は、上プレート11とアウターリング13の移動により、上サイドモールド20と下サイドモールド21を接近及び離間させるとともに、複数の分割モールド5を接近及び離間させる。これにより、開閉機構10は、モールド3を開閉する。モールド3が開くときには、上サイドモールド20と下サイドモールド21が離間し、分割モールド5の分割位置で複数の分割モールド5が離間する。モールド3が閉じるときには、上サイドモールド20と下サイドモールド21が接近し、複数の分割モールド5が接近して分割位置で接触する。その状態で、複数の分割モールド5は、リング状に組み合わされ、上サイドモールド20と下サイドモールド21にも組み合わされる。   The opening / closing mechanism 10 moves the upper plate 11 and the outer ring 13 so as to approach and separate the upper side mold 20 and the lower side mold 21, and also causes the plurality of split molds 5 to approach and separate. Thereby, the opening and closing mechanism 10 opens and closes the mold 3. When the mold 3 is opened, the upper side mold 20 and the lower side mold 21 are separated from each other, and the divided molds 5 are separated from each other at the division positions of the divided mold 5. When the mold 3 is closed, the upper side mold 20 and the lower side mold 21 approach each other, and the plurality of split molds 5 approach each other and come into contact at the split position. In this state, the plurality of split molds 5 are combined in a ring shape, and are also combined with the upper side mold 20 and the lower side mold 21.

上プレート11、下プレート12、及び、アウターリング13は、モールド3を加熱する加熱部材(上加熱部材、下加熱部材、外周加熱部材)でもある。タイヤ成形装置1は、加熱手段(図示せず)により上プレート11、下プレート12、及び、アウターリング13を加熱して、上プレート11、下プレート12、及び、アウターリング13により、モールド3を加熱する。これにより、モールド3がタイヤ2の成形温度(加硫温度)に加熱されて、タイヤ2がモールド3により成形温度に加熱される。   The upper plate 11, the lower plate 12, and the outer ring 13 are also heating members (upper heating member, lower heating member, outer peripheral heating member) for heating the mold 3. The tire forming apparatus 1 heats the upper plate 11, the lower plate 12, and the outer ring 13 by a heating means (not shown), and the mold 3 is heated by the upper plate 11, the lower plate 12, and the outer ring 13. Heat. Thereby, the mold 3 is heated to the molding temperature (vulcanization temperature) of the tire 2, and the tire 2 is heated to the molding temperature by the mold 3.

タイヤ2の成形時には、まず、モールド3を開いて(図2参照)、未加硫のタイヤ2を下サイドモールド21のサイド成形面21Aに配置する。続いて、モールド3を閉じて(図1参照)、タイヤ2をモールド3の内部空間7に収容する。また、ブラダ4をタイヤ2内に配置し、膨張したブラダ4によりタイヤ2を加圧する。その状態で、タイヤ2を加熱して、タイヤ2を加硫及び成形する。上サイドモールド20と下サイドモールド21は、タイヤ2のサイド部2Aに接触して、サイド成形面20A、21Aにより、タイヤ2のサイド部2Aを成形する。複数の分割モールド5は、タイヤ2のトレッド部2Bに接触して、トレッド成形面5Aにより、タイヤ2のトレッド部2Bを成形する。タイヤ2の成形後には、モールド3を開いて、成形後(加硫後)のタイヤ2をモールド3から取り出す。   When molding the tire 2, first, the mold 3 is opened (see FIG. 2), and the unvulcanized tire 2 is placed on the side molding surface 21 </ b> A of the lower side mold 21. Subsequently, the mold 3 is closed (see FIG. 1), and the tire 2 is housed in the internal space 7 of the mold 3. Further, the bladder 4 is arranged in the tire 2, and the tire 2 is pressed by the inflated bladder 4. In this state, the tire 2 is heated, and the tire 2 is vulcanized and molded. The upper side mold 20 and the lower side mold 21 come into contact with the side portion 2A of the tire 2 and form the side portion 2A of the tire 2 by the side forming surfaces 20A, 21A. The plurality of split molds 5 contact the tread portion 2B of the tire 2 and form the tread portion 2B of the tire 2 by the tread forming surface 5A. After the molding of the tire 2, the mold 3 is opened, and the molded (after vulcanized) tire 2 is removed from the mold 3.

複数の分割モールド5のそれぞれは、タイヤ2を成形する成形部材30と、成形部材30を支持する支持部材40を有する。成形部材30は、トレッド成形面5A(タイヤ成形面)を有する意匠面部材であり、支持部材40は、成形部材30の外周部を覆う外周部材である。成形部材30は、支持部材40に取り付けられて、トレッド成形面5Aでタイヤ2に接触する。支持部材40は、成形部材30の背面(タイヤ2の反対側の面)に取り付けられ、成形部材30を保持する。分割モールド5は、成形部材30のみにより、タイヤ2に接触して、タイヤ2を成形する。支持部材40は、可動部材14に取り付けられる。   Each of the plurality of split molds 5 has a molding member 30 for molding the tire 2 and a support member 40 for supporting the molding member 30. The molding member 30 is a design surface member having a tread molding surface 5A (tire molding surface), and the support member 40 is an outer peripheral member that covers the outer peripheral portion of the molding member 30. The molding member 30 is attached to the support member 40 and contacts the tire 2 on the tread molding surface 5A. The support member 40 is attached to the back surface of the molded member 30 (the surface opposite to the tire 2), and holds the molded member 30. The split mold 5 forms the tire 2 by contacting the tire 2 only by the forming member 30. The support member 40 is attached to the movable member 14.

図3、図4は、図1のX−X線で切断した複数の分割モールド5と可動部材14を示す断面図である。また、図3は、室温においてリング状に組み合わせた複数の分割モールド5を示し、図4は、タイヤ2の成形時における複数の分割モールド5を示している。
図示のように、複数の分割位置Pのそれぞれで、複数の分割モールド5が分割されて、分割モールド5の分割面5Bが対向する。複数の分割モールド5は、分割された状態から、分割面5Bを密着させてリング状に組み合わされ、所定の型締め力で型締めされる。モールド3は、型締めされた複数の分割モールド5により、タイヤ2を加熱しつつ成形する。
FIGS. 3 and 4 are cross-sectional views showing the plurality of divided molds 5 and the movable member 14 taken along line XX in FIG. FIG. 3 shows a plurality of divided molds 5 combined in a ring shape at room temperature, and FIG. 4 shows a plurality of divided molds 5 when the tire 2 is formed.
As shown in the drawing, the plurality of division molds 5 are divided at each of the plurality of division positions P, and the division surfaces 5B of the division mold 5 face each other. The plurality of split molds 5 are assembled in a ring shape from the split state by bringing the split surfaces 5B into close contact with each other, and are clamped with a predetermined clamping force. The mold 3 is formed while heating the tire 2 by the plurality of divided molds 5 that have been clamped.

分割モールド5の分割面5Bは、成形部材30の分割面31と支持部材40の分割面41からなる。分割面31、41は、各部材30、40のモールド周方向Sの端部に位置する端面であり、平滑な平面に形成されている。室温の状態の各分割モールド5において(図3参照)、成形部材30のモールド周方向Sの長さと支持部材40のモールド周方向Sの長さは、互いに異なる長さに設定される。ここでは、成形部材30のモールド周方向Sの長さが支持部材40のモールド周方向Sの長さより短く、支持部材40が成形部材30に対してモールド周方向Sに突出する。そのため、室温の状態の分割モールド5の分割面5Bは、2つの分割面41、31の間に段差32を有する。即ち、分割面5Bにおいて、支持部材40の分割面41の位置と成形部材30の分割面31の位置がずれて、支持部材40の分割面41と成形部材30の分割面31の間に段差32が形成される。   The division surface 5B of the division mold 5 includes a division surface 31 of the molding member 30 and a division surface 41 of the support member 40. The dividing surfaces 31 and 41 are end surfaces located at the ends of the members 30 and 40 in the mold circumferential direction S, and are formed as smooth flat surfaces. In each of the split molds 5 at room temperature (see FIG. 3), the length of the molding member 30 in the mold circumferential direction S and the length of the support member 40 in the mold circumferential direction S are set to different lengths. Here, the length of the molding member 30 in the mold circumferential direction S is shorter than the length of the support member 40 in the mold circumferential direction S, and the support member 40 protrudes from the molding member 30 in the mold circumferential direction S. Therefore, the division surface 5 </ b> B of the division mold 5 at room temperature has a step 32 between the two division surfaces 41 and 31. That is, in the division surface 5B, the position of the division surface 41 of the support member 40 and the position of the division surface 31 of the molding member 30 are shifted, and a step 32 is formed between the division surface 41 of the support member 40 and the division surface 31 of the molding member 30. Is formed.

複数の分割モールド5が室温でリング状に組み合わされた状態では、分割モールド5の分割位置Pで、支持部材40の分割面41は互いに接触する。これに対し、成形部材30の分割面31は互いに接触せず、隣接する成形部材30の分割面31の間に、段差32に対応する隙間33が形成される。タイヤ2の成形時には(図4参照)、成形部材30と支持部材40は、タイヤ2の成形温度に加熱されて、それぞれモールド周方向Sに熱膨張する。成形部材30の熱膨張率は、支持部材40の熱膨張率より大きく、タイヤ2の成形時に、成形部材30の熱膨張量は、支持部材40の熱膨張量より大きくなる。成形部材30と支持部材40の熱膨張量は、モールド周方向Sの熱膨張量であり、成形部材30は、支持部材40よりモールド周方向Sに大きく熱膨張する。   In a state where the plurality of split molds 5 are combined in a ring shape at room temperature, the split surfaces 41 of the support member 40 are in contact with each other at the split position P of the split mold 5. On the other hand, the divided surfaces 31 of the molded member 30 do not contact each other, and a gap 33 corresponding to the step 32 is formed between the divided surfaces 31 of the adjacent molded members 30. At the time of molding the tire 2 (see FIG. 4), the molding member 30 and the supporting member 40 are heated to the molding temperature of the tire 2 and thermally expand in the mold circumferential direction S, respectively. The coefficient of thermal expansion of the molded member 30 is greater than the coefficient of thermal expansion of the support member 40, and the amount of thermal expansion of the molded member 30 during molding of the tire 2 is greater than the amount of thermal expansion of the support member 40. The amount of thermal expansion of the forming member 30 and the supporting member 40 is the amount of thermal expansion in the mold circumferential direction S, and the forming member 30 expands more in the mold circumferential direction S than the supporting member 40.

タイヤ2の成形時には、支持部材40と成形部材30がそれぞれ熱膨張した状態で、分割モールド5の分割位置Pで、支持部材40の分割面41と成形部材30の分割面31がそれぞれ密着する。即ち、分割モールド5の分割位置Pでは、支持部材40と成形部材30の熱膨張量の差により、分割面41と分割面31の間の段差32(分割面31の間の隙間33)が消滅して、分割面31、41がそれぞれ密着する。タイヤ2の成形時において、支持部材40の剛性は成形部材30の剛性より高く、支持部材40が成形部材30より変形し難い。   At the time of molding the tire 2, the split surface 41 of the support member 40 and the split surface 31 of the formed member 30 come into close contact with each other at the split position P of the split mold 5 with the support member 40 and the formed member 30 thermally expanded respectively. That is, at the division position P of the division mold 5, the step 32 (the gap 33 between the division surfaces 31) between the division surface 41 and the division surface 31 disappears due to the difference in the amount of thermal expansion between the support member 40 and the molding member 30. As a result, the divided surfaces 31 and 41 come into close contact with each other. When the tire 2 is molded, the rigidity of the support member 40 is higher than the rigidity of the molded member 30, and the support member 40 is less likely to deform than the molded member 30.

ここでは、支持部材40の強度(例えば、圧縮強度)が成形部材30の強度より高く、支持部材40のクリープ変形抵抗が成形部材30のクリープ変形抵抗より大きい。また、支持部材40は鋼製であり、成形部材30はアルミニウム合金製である。成形部材30は、弾性変形可能に支持部材40に取り付けられて、支持部材40により支持された状態で弾性変形する。タイヤ2の成形時には、分割モールド5の分割位置Pで、成形部材30の分割面31が密着して、分割面31に加わる力により、成形部材30が弾性変形する。タイヤ2の成形後には、分割面31が離間して、成形部材30が元の状態に復帰する。   Here, the strength (for example, compressive strength) of the support member 40 is higher than the strength of the molded member 30, and the creep deformation resistance of the support member 40 is larger than the creep deformation resistance of the molded member 30. The support member 40 is made of steel, and the formed member 30 is made of an aluminum alloy. The molding member 30 is attached to the support member 40 so as to be elastically deformable, and elastically deforms while being supported by the support member 40. When the tire 2 is molded, the divided surface 31 of the molded member 30 is brought into close contact with the divided position P of the divided mold 5, and the molded member 30 is elastically deformed by the force applied to the divided surface 31. After the tire 2 is formed, the divided surfaces 31 are separated from each other, and the formed member 30 returns to the original state.

タイヤ2の成形時に、複数の分割モールド5の支持部材40は、分割モールド5の分割位置Pで互いの分割面41を密着させて、リング状に組み合わされる。支持部材40の分割面41の一部又は全部が密着して、支持部材40が分割モールド5の型締め力を受ける。支持部材40の分割面41は、分割モールド5の分割位置Pにおいて対向する支持部材40同士の対向面であり、成形部材30に接触せず、対向する支持部材40の分割面41のみに密着する。分割面41が密着する状態で、複数の分割モールド5の支持部材40は、分割モールド5の分割面5Bに加わる力を受けて、複数の分割モールド5の形状を保持するとともに、成形部材30の分割面31の変形を規制する。   When the tire 2 is formed, the support members 40 of the plurality of split molds 5 are combined in a ring shape at the split position P of the split mold 5 with the split surfaces 41 being in close contact with each other. A part or the whole of the division surface 41 of the support member 40 comes into close contact, and the support member 40 receives the clamping force of the division mold 5. The dividing surface 41 of the supporting member 40 is an opposing surface between the supporting members 40 facing each other at the dividing position P of the dividing mold 5, and does not contact the forming member 30, but only comes into close contact with the opposing dividing surface 41 of the supporting member 40. . In a state where the divided surfaces 41 are in close contact with each other, the support members 40 of the plurality of divided molds 5 receive the force applied to the divided surfaces 5B of the divided molds 5, hold the shapes of the plurality of divided molds 5, and form the molded members 30. The deformation of the division surface 31 is regulated.

タイヤ2の成形時に、複数の分割モールド5の成形部材30は、分割モールド5の分割位置Pで、対向する支持部材40の分割面41が密着した状態で、熱膨張により互いの分割面31を密着させて、分割面31でのタイヤ2のはみ出しを規制する。分割位置Pの全体で、成形部材30の分割面31の一部又は全部が密着して、複数の分割モールド5の成形部材30がリング状に組み合わされる。成形部材30の分割面31は、分割モールド5の分割位置Pにおいて対向する成形部材30同士の対向面であり、支持部材40に接触せず、対向する成形部材30の分割面31のみに密着する。分割面31の密着により、タイヤ2のゴムが分割面31の間に浸入せず、タイヤ2のゴムが分割面31の間にはみ出すのが規制される。   When the tire 2 is molded, the molding members 30 of the plurality of split molds 5 are separated from each other by thermal expansion at the split positions P of the split mold 5 with the split surfaces 41 of the opposing support members 40 in close contact. The protrusions of the tire 2 on the dividing surface 31 are regulated by being brought into close contact with each other. A part or the whole of the division surface 31 of the molding member 30 is in close contact with the entire division position P, and the molding members 30 of the plurality of division molds 5 are combined in a ring shape. The division surface 31 of the molding member 30 is an opposing surface of the molding members 30 facing each other at the division position P of the division mold 5, does not contact the support member 40, and comes into close contact only with the division surface 31 of the molding member 30 facing the division member 31. . Due to the close contact between the divided surfaces 31, the rubber of the tire 2 does not enter between the divided surfaces 31, and the rubber of the tire 2 is restricted from protruding between the divided surfaces 31.

分割面41を密着させた支持部材40により、成形部材30の分割面31の変形が規制されるとともに、成形部材30の分割面31に加わる力が低減される。そのため、タイヤ2の成形を繰り返しても、分割面31の変形の進行が抑制されて、分割面31の状態が維持される。これに伴い、タイヤ2の成形時に、分割面31の間に隙間が形成されるのが抑制されて、分割面31が密着する。   The deformation of the divided surface 31 of the molding member 30 is restricted by the support member 40 in which the division surface 41 is in close contact, and the force applied to the division surface 31 of the molding member 30 is reduced. Therefore, even if the molding of the tire 2 is repeated, the progress of the deformation of the divided surface 31 is suppressed, and the state of the divided surface 31 is maintained. Accordingly, at the time of molding the tire 2, the formation of a gap between the divided surfaces 31 is suppressed, and the divided surfaces 31 adhere to each other.

以上説明したように、本実施形態のモールド3では、分割モールド5の分割面5B(ここでは、成形部材30の分割面31)の変形を抑制することができる。また、分割モールド5の分割位置Pで、タイヤ2のはみ出しを規制して、バリの発生を抑制できるとともに、分割モールド5の寿命を向上させることができる。   As described above, in the mold 3 of the present embodiment, deformation of the division surface 5B of the division mold 5 (here, the division surface 31 of the molding member 30) can be suppressed. In addition, the protrusion of the tire 2 is restricted at the division position P of the division mold 5, the occurrence of burrs can be suppressed, and the life of the division mold 5 can be improved.

支持部材40の強度は成形部材30の強度より高く、支持部材40のクリープ変形抵抗は成形部材30のクリープ変形抵抗より大きい。そのため、支持部材40の変形を抑制でき、支持部材40により分割モールド5の分割面5Bに加わる力を確実に受けることができる。これに伴い、成形部材30の分割面31の変形の進行を、より確実に抑制することができる。   The strength of the support member 40 is higher than the strength of the formed member 30, and the creep deformation resistance of the support member 40 is larger than the creep deformation resistance of the formed member 30. Therefore, the deformation of the support member 40 can be suppressed, and the force applied to the division surface 5B of the division mold 5 by the support member 40 can be reliably received. Along with this, the progress of the deformation of the divided surface 31 of the molding member 30 can be more reliably suppressed.

分割面31、41の間の段差32の寸法を変更することで、タイヤ2の成形時に、支持部材40の分割面41と成形部材30の分割面31のそれぞれに加わる力を調整することができる。これにより、支持部材40の分割面41と成形部材30の分割面31に、それぞれに応じた力を配分することができる。   By changing the size of the step 32 between the divided surfaces 31 and 41, it is possible to adjust the force applied to each of the divided surface 41 of the support member 40 and the divided surface 31 of the molded member 30 when the tire 2 is molded. . Thereby, a force corresponding to each of the divided surface 41 of the support member 40 and the divided surface 31 of the molded member 30 can be distributed.

分割モールド5の分割位置Pでは、成形部材30を弾性変形させて、分割面31を確実に密着させることができる。成形部材30の弾性変形量は、タイヤ2の成形時に分割モールド5の分割位置Pで成形部材30が弾性変形する量であり、支持部材40と成形部材30の機械的特性(熱膨張率、ヤング率、降伏点、クリープ変形特性等)に対応して設定される。例えば、支持部材40が鋼製であり、成形部材30がアルミニウム合金製であるときには、成形部材30の弾性変形量が0.02〜0.10mmであるのが好ましい。   At the division position P of the division mold 5, the molding member 30 is elastically deformed, so that the division surface 31 can be securely brought into close contact. The elastic deformation amount of the molding member 30 is an amount of elastic deformation of the molding member 30 at the division position P of the division mold 5 when the tire 2 is molded, and the mechanical properties (the coefficient of thermal expansion, the Young's Rate, yield point, creep deformation characteristics, etc.). For example, when the supporting member 40 is made of steel and the forming member 30 is made of an aluminum alloy, the amount of elastic deformation of the forming member 30 is preferably 0.02 to 0.10 mm.

なお、成形部材30と支持部材40の材料は、互いに異なる材料であってもよく、同じ材料であってもよい。分割モールド5の分割位置Pで、成形部材30の分割面31は、トレッド成形面5Aの縁部に沿って密着して、タイヤ2のはみ出しを規制する。これに対し、支持部材40の分割面41は、分割モールド5の分割位置Pで、成形部材30の分割面31の変形を規制可能な状態に密着すればよい。   The material of the molding member 30 and the material of the support member 40 may be different from each other, or may be the same. At the division position P of the division mold 5, the division surface 31 of the molding member 30 adheres closely along the edge of the tread molding surface 5A, and regulates the protrusion of the tire 2. On the other hand, the division surface 41 of the support member 40 may be brought into close contact with the division position P of the division mold 5 such that the deformation of the division surface 31 of the molding member 30 can be restricted.

一対のサイドモールド20、21(図1、図2参照)は、リング状に形成してもよく、円盤状に形成してもよい。サイドモールド20、21の材料は、成形部材30と同じ材料でもよく、成形部材30とは異なる材料でもよい。また、サイドモールド20、21の材料は、支持部材40と同じ材料でもよく、支持部材40とは異なる材料でもよい。   The pair of side molds 20 and 21 (see FIGS. 1 and 2) may be formed in a ring shape or a disk shape. The material of the side molds 20 and 21 may be the same material as the molded member 30 or a material different from the molded member 30. Further, the material of the side molds 20 and 21 may be the same material as the support member 40 or a material different from the support member 40.

タイヤ2の成形時に、複数の分割モールド5の成形部材30を一対のサイドモールド20、21に密着させて、成形部材30とサイドモールド20、21の間へのタイヤ2のはみ出しを規制してもよい。その際、複数の分割モールド5の支持部材40がサイドモールド20、21に密着した状態で、成形部材30をサイドモールド20、21に密着させる。サイドモールド20、21に密着した支持部材40により、成形部材30のサイドモールド20、21に密着する部分の変形が抑制される。   At the time of molding the tire 2, even if the molding members 30 of the plurality of split molds 5 are brought into close contact with the pair of side molds 20 and 21, the protrusion of the tire 2 between the molding members 30 and the side molds 20 and 21 is regulated. Good. At that time, the molding member 30 is brought into close contact with the side molds 20 and 21 in a state where the support members 40 of the plurality of split molds 5 are in close contact with the side molds 20 and 21. The supporting member 40 that is in close contact with the side molds 20 and 21 suppresses deformation of a portion of the molding member 30 that is in close contact with the side molds 20 and 21.

この場合には、例えば、サイドモールド20、21の熱膨張率を支持部材40の熱膨張率と同等にし、成形部材30の熱膨張率をサイドモールド20、21の熱膨張率より大きくする。また、室温でサイドモールド20、21と複数の分割モールド5を組み合わせた状態で、サイドモールド20、21と支持部材40を密着させ、サイドモールド20、21と成形部材30の間に隙間を形成する。タイヤ2の成形時には、サイドモールド20、21と成形部材30がそれぞれ熱膨張した状態で、サイドモールド20、21と成形部材30が密着する。その際、サイドモールド20、21と成形部材30の熱膨張量の差により、サイドモールド20、21と成形部材30の間の隙間が消滅して、サイドモールド20、21と成形部材30が密着する。また、成形部材30は、サイドモールド20、21に密着して、弾性変形する。   In this case, for example, the coefficient of thermal expansion of the side molds 20 and 21 is made equal to the coefficient of thermal expansion of the support member 40, and the coefficient of thermal expansion of the molded member 30 is made larger than the coefficient of thermal expansion of the side molds 20 and 21. Further, in a state where the side molds 20, 21 and the plurality of split molds 5 are combined at room temperature, the side molds 20, 21 and the support member 40 are brought into close contact with each other to form a gap between the side molds 20, 21 and the molding member 30. . When the tire 2 is molded, the side molds 20 and 21 and the molded member 30 are in close contact with each other while the side molds 20 and 21 and the molded member 30 are thermally expanded. At this time, the gap between the side molds 20, 21 and the molding member 30 disappears due to the difference in the amount of thermal expansion between the side molds 20, 21 and the molding member 30, and the side molds 20, 21 and the molding member 30 adhere to each other. . Further, the molding member 30 is brought into close contact with the side molds 20 and 21 and elastically deforms.

タイヤ2の成形時において、サイドモールド20、21の剛性を成形部材30及び支持部材40の剛性より高くするのが好ましい。具体的には、サイドモールド20、21の強度を成形部材30及び支持部材40の強度より高くし、サイドモールド20、21のクリープ変形抵抗を成形部材30及び支持部材40のクリープ変形抵抗より大きくする。このようにすることで、サイドモールド20、21の損傷が抑制され、モールド3の補修が必要になったときに、サイドモールド20、21の補修を容易に行うことができる。サイドモールド20、21を微調整のみで修正でき、例えば、旋削によりサイドモールド20、21の各部の直径を修正するだけで、サイドモールド20、21を修正できる。   When molding the tire 2, it is preferable that the rigidity of the side molds 20 and 21 be higher than the rigidity of the molding member 30 and the supporting member 40. Specifically, the strength of the side molds 20 and 21 is made higher than the strength of the molding member 30 and the support member 40, and the creep deformation resistance of the side molds 20 and 21 is made larger than the creep deformation resistance of the molding member 30 and the support member 40. . By doing so, the damage to the side molds 20 and 21 is suppressed, and when the mold 3 needs to be repaired, the side molds 20 and 21 can be easily repaired. The side molds 20 and 21 can be corrected only by fine adjustment. For example, the side molds 20 and 21 can be corrected only by correcting the diameter of each part of the side molds 20 and 21 by turning.

図5は、他の実施形態のモールド3を示す図であり、1つの分割モールド5を示している。図5Aは、分割モールド5の斜視図である。図5Bは、図5Aの矢印Y1方向からみた分割モールド5の側面図であり、図5Cは、図5Aの矢印Y2方向からみた成形部材30の正面図である。
ここでは、図示のように、成形部材30は、複数の分割成形部34を有する。複数の分割成形部34は、1つの成形部材30を構成する成形ピースであり、1つの支持部材40により支持されて、それぞれタイヤ2を成形する。
FIG. 5 is a view showing a mold 3 according to another embodiment, and shows one split mold 5. FIG. 5A is a perspective view of the split mold 5. FIG. 5B is a side view of the split mold 5 as viewed from the direction of arrow Y1 in FIG. 5A, and FIG. 5C is a front view of the molding member 30 as viewed from the direction of arrow Y2 in FIG. 5A.
Here, as illustrated, the molding member 30 has a plurality of divided molding portions 34. The plurality of divided molding portions 34 are molding pieces that constitute one molding member 30, and are supported by one support member 40, and each mold the tire 2.

成形部材30がモールド周方向Sに複数に分割されて、複数の分割成形部34が形成される。複数の分割成形部34は、それぞれ支持部材40に取り付けられて、支持部材40により保持される。また、分割成形部34の分割面35は、平面以外の形状(例えば、湾曲面、屈曲面、ジグザグ面)に形成され、複数の分割成形部34の分割位置Tで互いに対向する。ここでは、分割成形部34の分割面35は、湾曲面(図5C参照)に形成され、成形部材30の分割面31と支持部材40の分割面41も、分割成形部34の分割面35に対応する湾曲面に形成されている。なお、図5A、図5Bでは、分割面31、35、41の形状を簡略にして平面で示している。このように、分割成形部34の分割面35は、平面に形成してもよい。   The molding member 30 is divided into a plurality in the mold circumferential direction S, and a plurality of divided molding portions 34 are formed. The plurality of divided molded parts 34 are respectively attached to the support members 40 and are held by the support members 40. In addition, the division surfaces 35 of the division molding portions 34 are formed in shapes other than planes (for example, curved surfaces, bent surfaces, zigzag surfaces), and face each other at division positions T of the plurality of division molding portions 34. Here, the division surface 35 of the division molding part 34 is formed into a curved surface (see FIG. 5C), and the division surface 31 of the molding member 30 and the division surface 41 of the support member 40 also It is formed on a corresponding curved surface. In FIGS. 5A and 5B, the shapes of the division surfaces 31, 35, and 41 are simplified and shown as planes. As described above, the division surface 35 of the division molding part 34 may be formed as a flat surface.

複数の分割モールド5の成形部材30と同様に、タイヤ2の成形時に、成形部材30の複数の分割成形部34は、各分割位置Tで互いの分割面35を密着させて、分割面35でのタイヤ2のはみ出しを規制する。分割位置Tの全体で、分割成形部34の分割面35の一部又は全部が密着して、複数の分割成形部34が組み合わされる。分割面35の密着により、タイヤ2のゴムが分割面35の間に浸入せず、タイヤ2のゴムが分割面35の間にはみ出すのが規制される。   Like the molding member 30 of the plurality of division molds 5, when molding the tire 2, the plurality of division molding portions 34 of the molding member 30 make the divided surfaces 35 adhere to each other at each division position T, and Of the tire 2 is restricted. At the entire division position T, a part or the whole of the division surface 35 of the division molding part 34 is in close contact, and a plurality of division molding parts 34 are combined. Due to the close contact of the divided surfaces 35, the rubber of the tire 2 does not enter between the divided surfaces 35, and the rubber of the tire 2 is restricted from protruding between the divided surfaces 35.

成形部材30を複数の分割成形部34に分割することで、タイヤ2の成形時に、成形部材30の分割面31と分割成形部34の分割面35に加わる力がより低減される。そのため、タイヤ2の成形を繰り返したときに、分割面31、35の変形の進行がより抑制される。従って、分割面31、35の変形を抑制して、成形部材30の寿命を更に長くすることができる。   By dividing the molding member 30 into the plurality of division molding portions 34, the force applied to the division surface 31 of the molding member 30 and the division surface 35 of the division molding portion 34 at the time of molding the tire 2 is further reduced. For this reason, when the molding of the tire 2 is repeated, the progress of the deformation of the divided surfaces 31 and 35 is further suppressed. Therefore, the deformation of the divided surfaces 31 and 35 can be suppressed, and the life of the molded member 30 can be further extended.

以上、ゴム物品がタイヤである場合を例にとり、モールド3について説明したが、ゴム物品は、タイヤに限定されず、他のゴム物品であってもよい。ゴム物品は、モールド3により成形されるゴム製の物品であり、例えば、ゴムのみからなる物品、又は、ゴムと他の部材からなる物品である。   As described above, the mold 3 has been described taking the case where the rubber article is a tire as an example, but the rubber article is not limited to the tire, and may be another rubber article. The rubber article is a rubber article formed by the mold 3, and is, for example, an article made of only rubber or an article made of rubber and other members.

(タイヤ2の成形試験)
本発明の効果を確認するため、以上説明したモールド3に対応する3つの実施例のモールド(実施品1〜3という)と、1つの比較例のモールド(比較品という)を製作して、それらにより同じタイヤ2(外径:φ675mm)を成形した。
(Tire 2 molding test)
In order to confirm the effects of the present invention, molds of three examples (referred to as examples 1 to 3) corresponding to the mold 3 described above and a mold of a comparative example (referred to as comparative article) were manufactured. To form the same tire 2 (outer diameter: 675 mm).

実施品1〜3では、複数の分割モールド5の形状は、同じ形状(外径:φ840mm、高さ:314mm、内径:φ613mm、)であり、成形部材30と支持部材40の厚みの比率は、50:50である。また、分割モールド5は、リングを9分割した形状に形成されており、分割モールド5の中心角(図4の角度K参照)は、40°である。室温(ここでは、20℃)の状態で、支持部材40の分割面41と成形部材30の分割面31の間に段差32(モールド周方向Sの寸法:0.08mm)が形成される。段差32の位置では、成形部材30側の部分が凹部であり、支持部材40が成形部材30に対してモールド周方向Sに突出する。タイヤ2の成形時には、分割モールド5の分割位置Pで、支持部材40の分割面41の全部が密着し、成形部材30の分割面31の一部(トレッド成形面5Aから10mm程度の範囲)が密着する。その状態で、成形部材30が分割面31側で弾性変形する。   In Examples 1 to 3, the shapes of the plurality of split molds 5 are the same (outer diameter: 840 mm, height: 314 mm, inner diameter: 613 mm), and the ratio of the thickness of the forming member 30 to the thickness of the supporting member 40 is as follows. 50:50. The split mold 5 is formed in a shape obtained by dividing the ring into nine parts, and the central angle of the split mold 5 (see the angle K in FIG. 4) is 40 °. At room temperature (here, 20 ° C.), a step 32 (dimension in the circumferential direction S of the mold: 0.08 mm) is formed between the divided surface 41 of the support member 40 and the divided surface 31 of the molding member 30. At the position of the step 32, the portion on the molding member 30 side is a concave portion, and the support member 40 protrudes from the molding member 30 in the mold circumferential direction S. At the time of molding the tire 2, at the division position P of the division mold 5, the entire division surface 41 of the support member 40 is in close contact, and a part of the division surface 31 of the molding member 30 (a range of about 10 mm from the tread molding surface 5 </ b> A). In close contact. In this state, the molded member 30 is elastically deformed on the division surface 31 side.

実施品1では、成形部材30は、アルミニウム合金(JIS規格:AC4C)製であり、支持部材40は、鋼(JIS規格:SS400)製である。実施品1の分割モールド5は、1つの成形部材30(中心角:40°)と、1つの支持部材40(中心角:40°)を有する。実施品2では、成形部材30は、アルミニウム合金(JIS規格:AC7A)製であり、支持部材40は、鋼(JIS規格:SS400)製である。実施品2の分割モールド5は、1つの成形部材30(中心角:40°)と、1つの支持部材40(中心角:40°)を有する。   In the first embodiment, the formed member 30 is made of an aluminum alloy (JIS standard: AC4C), and the support member 40 is made of steel (JIS standard: SS400). The split mold 5 of the embodiment 1 has one molding member 30 (central angle: 40 °) and one support member 40 (central angle: 40 °). In the second embodiment, the molded member 30 is made of an aluminum alloy (JIS standard: AC7A), and the support member 40 is made of steel (JIS standard: SS400). The split mold 5 of the embodiment 2 has one molding member 30 (central angle: 40 °) and one support member 40 (central angle: 40 °).

実施品3では、成形部材30は、アルミニウム合金(JIS規格:AC4C)製であり、支持部材40は、鋼(JIS規格:SS400)製である。実施品3の分割モールド5(図5参照)では、成形部材30が2つの分割成形部34(中心角:20°)を有し、2つの分割成形部34が1つの支持部材40(中心角:40°)により支持される。   In the third embodiment, the molded member 30 is made of an aluminum alloy (JIS standard: AC4C), and the support member 40 is made of steel (JIS standard: SS400). In the split mold 5 (see FIG. 5) of the product 3, the forming member 30 has two split forming portions 34 (central angle: 20 °), and the two split forming portions 34 have one support member 40 (central angle). : 40 °).

比較品では、複数の分割モールドは、実施品1〜3と同じ形状であり、分割モールドは、リングを9分割した形状(中心角:40°)に形成されている。ただし、比較品の分割モールドは、アルミニウム合金(JIS規格:AC7A)製の1つの部材であり、成形部材30と支持部材40とに分割されていない。タイヤ2の成形時には、分割モールドの分割面の一部(トレッド成形面から10mm程度の範囲)が密着する。   In the comparative product, the plurality of split molds have the same shape as the examples 1 to 3, and the split mold is formed in a shape obtained by dividing the ring into nine (center angle: 40 °). However, the split mold of the comparative product is one member made of an aluminum alloy (JIS standard: AC7A) and is not divided into the molded member 30 and the support member 40. At the time of molding the tire 2, a part of the division surface of the division mold (a range of about 10 mm from the tread molding surface) is in close contact.

実施品1〜3と比較品により、同じ条件で、タイヤ2を繰り返し成形して、分割モールドの寿命(変形寿命)を調査した。実施品1〜3の変形寿命は、成形部材30の分割面31の変形量が0.04mm程度になるまでの成形時間であり、比較品の変形寿命は、分割モールドの分割面の変形量が0.04mm程度になるまでの成形時間である。   The tires 2 were repeatedly molded under the same conditions using the examples 1 to 3 and the comparative example, and the life (deformation life) of the split mold was investigated. The deformation life of Examples 1 to 3 is the molding time until the deformation of the divided surface 31 of the molded member 30 becomes about 0.04 mm, and the deformation life of the comparative product is the deformation of the divided surface of the divided mold. It is the molding time until it becomes about 0.04 mm.

Figure 0006655969
Figure 0006655969

表1は、実施品1〜3と比較品に関する条件と、変形寿命の結果を示す。変形寿命は、比較品を基準(1倍)とした指数で表す。変形寿命の値が大きいほど、変形寿命が長いことを示す。   Table 1 shows the conditions for the working products 1 to 3 and the comparative product, and the results of the deformation life. The deformation life is represented by an index based on the comparison product (1 time). A larger deformation life value indicates a longer deformation life.

試験の結果、実施品1の変形寿命は、比較品の変形寿命の3.8倍であり、実施品2の変形寿命は、比較品の変形寿命の8.8倍であった。また、実施品3の変形寿命は、比較品の変形寿命の250倍であった。これにより、実施品1〜3では、分割モールド5の分割面5Bの変形を抑制して、分割モールド5の寿命を向上できることが分かった。特に、成形部材30を複数の分割成形部34に分割することで、変形寿命を大幅に長くできることも分かった。   As a result of the test, the deformation life of Example 1 was 3.8 times the deformation life of the comparative product, and the deformation life of Example 2 was 8.8 times the deformation life of the comparative product. The deformation life of the product 3 was 250 times the deformation life of the comparative product. Thereby, in Examples 1-3, it turned out that deformation of division surface 5B of division mold 5 can be controlled and life of division mold 5 can be improved. In particular, it was also found that by dividing the molded member 30 into a plurality of divided molded portions 34, the deformation life can be greatly extended.

1・・・タイヤ成形装置、2・・・タイヤ、3・・・モールド、4・・・ブラダ、5・・・分割モールド、6・・・保持リング、7・・・内部空間、10・・・開閉機構、11・・・上プレート、12・・・下プレート、13・・・アウターリング、14・・・可動部材、20・・・上サイドモールド、21・・・下サイドモールド、30・・・成形部材、31・・・分割面、32・・・段差、33・・・隙間、34・・・分割成形部、35・・・分割面、40・・・支持部材、41・・・分割面、H・・・モールド半径方向、S・・・モールド周方向、T・・・分割位置、P・・・分割位置、W・・・タイヤ幅方向。   DESCRIPTION OF SYMBOLS 1 ... Tire molding apparatus, 2 ... Tire, 3 ... Mold, 4 ... Bladder, 5 ... Split mold, 6 ... Holding ring, 7 ... Internal space, 10 ... Opening / closing mechanism, 11 upper plate, 12 lower plate, 13 outer ring, 14 movable member, 20 upper side mold, 21 lower side mold, 30 ..Molded members, 31 ... Divided surfaces, 32 ... Steps, 33 ... Gaps, 34 ... Divided molded parts, 35 ... Divided surfaces, 40 ... Support members, 41 ... Division plane, H: mold radial direction, S: mold circumferential direction, T: division position, P: division position, W: tire width direction.

Claims (5)

分割面を密着させてリング状に組み合わされて、ゴム物品を加熱しつつ成形する複数の分割モールドと、複数の分割モールドと組み合わされるサイドモールドを備えたゴム物品用モールドであって、
ゴム物品は、複数の分割モールドによりトレッド部が成形されるとともにサイドモールドによりサイド部が成形されるタイヤであり、
複数の分割モールドのそれぞれは、ゴム物品を成形する成形部材と、成形部材を支持する支持部材を有し、
複数の分割モールドの成形部材は、ゴム物品の成形時に、分割モールドの分割位置で、支持部材の分割面が密着した状態で互いの分割面を密着させて、ゴム物品のはみ出しを規制し、
室温でサイドモールドと複数の分割モールドを組み合わせた状態で、サイドモールドと支持部材が密着し、サイドモールドと成形部材の間に隙間が形成され、
ゴム物品の成形時に、サイドモールドと成形部材がそれぞれ熱膨張した状態で、サイドモールドと成形部材が密着して、成形部材とサイドモールドの間へのゴム物品のはみ出しを規制するゴム物品用モールド。
A plurality of split molds that are combined in a ring shape by bringing the split surfaces into close contact with each other, and a rubber article mold having a side mold combined with a plurality of split molds that are molded while heating the rubber article,
The rubber article is a tire in which a tread portion is molded by a plurality of split molds and a side portion is molded by a side mold,
Each of the plurality of split molds has a molding member for molding the rubber article, and a support member for supporting the molding member,
Molding members of a plurality of split molds, at the time of molding of a rubber article, at the split position of the split mold, the split surfaces of the support member are brought into close contact with each other in a state where the split surfaces of the support members are in close contact with each other, to regulate the protrusion of the rubber article ,
In a state where the side mold and the plurality of split molds are combined at room temperature, the side mold and the support member adhere to each other, and a gap is formed between the side mold and the molding member,
A rubber article mold for regulating the protrusion of a rubber article between a molding member and a side mold, wherein the side mold and the molding member are in close contact with each other in a state where the side mold and the molding member are thermally expanded during molding of the rubber article .
請求項1に記載されたゴム物品用モールドにおいて、
室温の状態の分割モールドの分割面は、支持部材の分割面と成形部材の分割面の間に段差を有し、
ゴム物品の成形時に、支持部材と成形部材がそれぞれ熱膨張した状態で、分割モールドの分割位置で支持部材の分割面と成形部材の分割面がそれぞれ密着するゴム物品用モールド。
The rubber article mold according to claim 1,
The split surface of the split mold at room temperature has a step between the split surface of the support member and the split surface of the molded member,
A rubber article mold in which a divided surface of a support member and a divided surface of a molded member are closely adhered to each other at a division position of the divided mold in a state where the support member and the molded member are thermally expanded during molding of the rubber article.
請求項1又は2に記載されたゴム物品用モールドにおいて、
支持部材の強度は、成形部材の強度より高く、
支持部材のクリープ変形抵抗は、成形部材のクリープ変形抵抗より大きいゴム物品用モールド。
The mold for rubber articles according to claim 1 or 2,
The strength of the support member is higher than the strength of the molded member,
A mold for rubber articles, wherein the creep deformation resistance of the support member is greater than the creep deformation resistance of the molded member.
請求項1ないし3のいずれかに記載されたゴム物品用モールドにおいて、
成形部材は、支持部材により支持されて、ゴム物品の成形時に、各分割位置で分割面を密着させる複数の分割成形部を有するゴム物品用モールド。
The rubber article mold according to any one of claims 1 to 3,
The molding member is a rubber article mold having a plurality of divided molding portions that are supported by a support member and that bring a divided surface into close contact at each division position when the rubber article is molded.
請求項1ないし4のいずれかに記載されたゴム物品用モールドを備えたゴム物品の成形装置。   An apparatus for molding a rubber article, comprising the rubber article mold according to any one of claims 1 to 4.
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