WO2019202636A1 - Bead apex rubber forming device - Google Patents

Bead apex rubber forming device Download PDF

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Publication number
WO2019202636A1
WO2019202636A1 PCT/JP2018/015714 JP2018015714W WO2019202636A1 WO 2019202636 A1 WO2019202636 A1 WO 2019202636A1 JP 2018015714 W JP2018015714 W JP 2018015714W WO 2019202636 A1 WO2019202636 A1 WO 2019202636A1
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WO
WIPO (PCT)
Prior art keywords
bead
core
apex rubber
molding
wall surface
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PCT/JP2018/015714
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French (fr)
Japanese (ja)
Inventor
直保 中尾
弘幸 高橋
田中 祥介
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中田エンヂニアリング株式会社
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Priority to PCT/JP2018/015714 priority Critical patent/WO2019202636A1/en
Publication of WO2019202636A1 publication Critical patent/WO2019202636A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/48Bead-rings or bead-cores; Treatment thereof prior to building the tyre

Definitions

  • the present invention relates to a bead apex rubber forming apparatus capable of accurately forming a bead apex rubber on the outer peripheral surface of a bead core.
  • the bead apex rubber B is laid down onto the forming drum a prior to turning. Therefore, in the TOS structure, the bead apex rubber B (shown in FIG. 12 (B)) in the inclined state J2 that is inclined in advance in the tire axial direction is desired in order to facilitate the falling.
  • the portion b2 between the bead core members C and C of the carcass wound body is shaped like a toroid and the protruding portion b1. Is rolled up around the bead core member C. Therefore, in the SOT structure, the bead apex rubber B (shown in FIG. 12A) in the upright state J1 rising upright is desired.
  • Patent Documents 1 and 2 propose a bead apex rubber forming apparatus in which a bead apex rubber is integrally formed on the outer peripheral surface of a bead core that rotates around an axis.
  • JP 2013-237224 A Japanese Patent No. 6242460
  • a bead apex rubber in an upright state and a bead apex rubber in an inclined state can be selectively formed on the outer peripheral surface of the bead core, thereby improving the production efficiency and reducing the equipment cost.
  • An object is to provide a forming apparatus.
  • the molding head has a molding head that forms a molding chamber for bead apex rubber molding
  • the molding head is A first head portion comprising the first molding wall surface and a first core receiving surface that is continuous with the first molding wall surface and receives a core side surface on one side in the axial direction of the bead core; And a second head portion comprising the second molding wall surface and a second core receiving surface that is connected to the second molding wall surface and receives the core side surface on the other axial side of the bead core, At least one core receiving surface of the first and second core receiving surfaces is replaceably disposed on at least one head portion of the first and second head portions.
  • the first head portion preferably includes an exchange member having the first core receiving surface and a head main portion to which the exchange member is attached.
  • the replacement member is selected from a group of a plurality of types of replacement members having different angles ⁇ of the first core receiving surface with respect to the first molding wall surface, and the head It is preferably attached to the main part.
  • the group of the plurality of types of replacement members includes a reference replacement member having an angle ⁇ of 0 °.
  • the bead core holding means has a reference plane perpendicular to the bead core axis at an angle ⁇ with respect to the first molding wall surface in a meridional section including the bead core axis. It is preferable that the bead core can be held in an inclined state.
  • the angle ⁇ is preferably equal to the angle ⁇ .
  • the bead core holding means can change the angle ⁇ .
  • At least one core receiving surface of the first and second core receiving surfaces is replaceably disposed on at least one head portion of the first and second head portions.
  • an upright bead apex rubber and an inclined bead apex rubber can be selectively formed on the outer peripheral surface of the bead core, thereby improving production efficiency and reducing equipment costs. it can.
  • (A) is a perspective view of the 2nd head part which has a shutter wall part
  • (B) is a perspective view of the 2nd head part without a shutter wall part. It is meridional sectional drawing of the 1st head part which used the reference
  • (A), (B) is sectional drawing seen from the top explaining a formation step.
  • (A) is an inflow port closing step
  • (B) is a cross section viewed from above for explaining a joint space opening step.
  • (A) is a joint space closing step
  • (B) to (C) are cross sections seen from above for explaining the connection step.
  • (A), (B) is the side view and front view which show an example of a holding means.
  • (A), (B) is sectional drawing which shows the bead apex rubber of an upright state and an inclination state.
  • (A), (B) is sectional drawing explaining a part of formation process of the green tire of a TOS structure
  • (C) is sectional drawing explaining a part of formation process of the raw tire of a SOT structure.
  • a bead apex rubber forming apparatus 1 (sometimes simply referred to as a forming apparatus 1) of the present embodiment is a bead core that holds a bead core A for a tire so as to be rotatable around its axis i.
  • the holding means 2 and a molding head 5 attached to the tip of the rubber extruder 4 are provided, and the bead apex rubber B is continuously formed on the outer peripheral surface So of the bead core A over the entire circumference.
  • the rubber extruder 4 is not particularly limited, and a known structure can be appropriately employed.
  • a screw type extruder main body 4A having a gear pump 4B connected to the tip thereof is employed.
  • the rubber extruder 4 can supply the unvulcanized rubber G to the molding head 5 according to whether the gear pump 4B is turned on or off.
  • the bead core holding means 2 has a reference surface X perpendicular to the axis i on a first meridian wall S ⁇ b> 1 to be described later, for example, in a vertical meridional section including the axis i of the bead core A.
  • the bead core A can be held in an inclined state at an angle ⁇ .
  • the meridional section is orthogonal to the first molding wall surface S1.
  • the bead core holding means 2 is configured to be variable including the angle ⁇ of 0 °.
  • the bead core holding means 2 includes a holder 40 that rotatably holds the bead core A around the axis i, and a tilting tool 42 that can change the angle ⁇ of the bead core A held by the holder 40. At least.
  • the bead core holding means 2 further includes a lifting table 41 that can move the holding tool 40 up and down along the reference plane X, and a moving table 43 that can move the tilting tool 42 in the Fx direction.
  • the Fx direction is a direction extending, for example, in the horizontal direction along the meridional section (meridional plane), and is orthogonal to the first molding wall surface S1 in this example.
  • the holder 40 includes a plurality (four in this example) of rollers 40a that receive the inner peripheral surface of the bead core A and are parallel to each other.
  • Each roller 40a is pivotally supported by the elevating table 41 so as to be rotatable.
  • Each roller 40a is supported so as to be movable inward and outward in the radial direction around the axis i through an expansion / contraction diameter means (not shown).
  • the bead cores A of various sizes having different diameters can be detachably supported.
  • the expansion / contraction diameter means various known structures can be employed.
  • one of the rollers 40a is connected to a motor and can rotate and hold the held bead core A.
  • the elevating table 41 is guided by a rail provided on the tilting table 42 a and can move up and down along the reference plane X. Thereby, the height of the bead core A of various sizes can be adjusted according to the molding head 5.
  • the tilting tool 42 includes a tilting table 42a supported by a horizontal support shaft center Q provided on the movable table 43 so as to be tiltable in the vertical direction. Further, the tilting tool 42 includes a driving tool 42b for tilting the tilting table 42a, whereby the angle ⁇ can be changed.
  • a driving tool 42b for tilting the tilting table 42a, whereby the angle ⁇ can be changed.
  • the case where a cylinder is used as the driving tool 42c is shown.
  • a known structure such as a ball screw mechanism and a link mechanism can be employed as the driving tool 42b.
  • the rotating bead core A partially passes through the molding head 5 in the circumferential direction.
  • the molding head 5 is surrounded by the first molding wall surface S1 on one side in the axial direction of the molding head 5 and the second molding wall surface S2 on the other side on the outer peripheral surface So of the passing bead core A.
  • a forming chamber 11 having a triangular cross section extending in the circumferential direction is provided.
  • the molding head 5 includes a first head portion 12 which is a head main body fixed to the tip portion of the rubber extruder 4, and a holding means 13 (shown in FIG. 1). And a second head portion 14 which is a molding die supported through the second die portion 14.
  • the first head portion 12 forms the first molding wall surface S1 by an outward surface 12s facing in the Fx direction.
  • a rubber inflow port 15 through which unvulcanized rubber G from the rubber extruder 4 flows into the molding chamber 11 is formed on the first molding wall surface S1.
  • the first head unit 12 further includes a shutter 30 for opening and closing the rubber inflow port 15.
  • the shutter 30 has, for example, a plate shape, and slides back and forth on the front side (front side in the rotational direction of the bead core A) of a shutter wall portion 9 (shown in FIG. 5B), which will be described later.
  • the inlet 15 is opened and closed.
  • a guide groove 31 for guiding the shutter 30 is provided in the first molding wall surface S1.
  • a rubber inflow port 15 opens at the groove bottom of the guide groove 31.
  • the shutter 30 is actuated by moving means 32 as shown in FIG.
  • the moving means 32 of this example is a cylinder 32A supported on the side surface of the first head portion 12 via a mounting plate 33, and the shutter 30 is attached to the rod end thereof.
  • the second head portion 14 includes a second head portion 14A having a shutter wall portion 9 and a second head portion 14B having no shutter wall portion. Is done.
  • the second head portion 14 ⁇ / b> A includes the second molding wall surface S ⁇ b> 2 for forming the molding chamber 11, and the second core receiving surface 46 connected to the second molding wall surface S ⁇ b> 2.
  • the second core receiving surface 46 receives and holds the core side surface As2 on the other side in the axial direction of the bead core A.
  • the second head portion 14A further includes a shutter wall portion 9 protruding from the second molding wall surface S2.
  • the shutter wall 9 closes the molding chamber 11 on the rear side (the rear side in the rotation direction of the bead core A) from the rubber inlet 15.
  • the shutter wall 9 is preferably disposed in the vicinity of the rubber inlet 15, and the circumferential distance L (shown in FIG. 5A) between the shutter wall 9 and the rubber inlet 15 is 1 mm. The following is preferred.
  • the second head portion 14B (shown in FIG. 6B) does not include the shutter wall portion 9, and the length in the circumferential direction on the rear side (bead core A is smaller than that of the second head portion 14A). This is different from the second head portion 14A in that it is long on the rear side in the rotation direction.
  • At least one of the first and second core receiving surfaces 45 and 46 is at least one of the first and second head portions 12 and 14. It is arranged to be replaceable in the head part.
  • the first head portion 12 includes an exchange member 50 having a first core receiving surface 45 and a head main portion 51 to which the exchange member 50 is attached in a replaceable manner.
  • the replacement member 50 of this example includes a wall surface portion S1a that constitutes a part of the first molding wall surface S1, and a first core receiving surface 45 that is continuous with the wall surface portion S1a. Further, the replacement member 50 of the present example is detachably attached to the head main portion 51 with, for example, a bolt 52.
  • the head main portion 51 is provided with a wall surface portion S1b that constitutes the remaining portion of the first molding wall surface S1.
  • the replacement member 50 is selected from a group 50g of a plurality of types of replacement members having different angles ⁇ of the first core receiving surface 45 with respect to the first molding wall surface S1, and attached to the head main portion 51.
  • the group 50g of a plurality of types of replacement members includes a reference replacement member 50A (shown in FIG. 7) and an inclined replacement member 50B (shown in FIGS. 3 to 5).
  • the reference exchange member 50A is an exchange member in which the angle ⁇ is 0 °, that is, the first molding wall surface S1 and the first core receiving surface 45 are flush with each other.
  • a bead core member C having a bead apex rubber B in an upright state J1 shown in FIG. 12A can be formed.
  • the upright state J1 means a state in which the top portion e of the bead apex rubber B is located within the range between the core side surfaces As1 and As2.
  • the tilt replacement member 50B is a replacement member in which the first core receiving surface 45 is tilted at an angle ⁇ other than 0 ° with respect to the first molding wall surface S1.
  • the bead core member C having the bead apex rubber B in the inclined state J2 shown in FIG. 12B can be formed.
  • the inclined state J2 means a state in which the apex e of the bead apex rubber B deviates outward in the axial direction from the range between the core side surfaces As1 and As2.
  • the angle ⁇ of the replacement member 50 is equal to the angle ⁇ (shown in FIG. 1) by the bead core holding means 2.
  • the second core receiving surface 46 When the bead apex rubber B in the upright state J1 and the inclined state J2 is switched and formed, the second core receiving surface 46 also needs to be changed in accordance with the first core receiving surface 45.
  • the second head portion 14 is small, and it is necessary to change the second molding wall surface S2 in accordance with the height of the bead apex rubber B or the like. Therefore, in this example, the second core receiving surface 46 is formed integrally with the second head portion 14 and is exchanged together with the second head portion 14.
  • the second head unit 14 includes an exchange member (not shown) having the second core receiving surface 46, and a head main part (not shown) to which the exchange member is attached. It may be constituted by.
  • the holding means 13 includes a movable table 20 that can move in the circumferential direction on the first head portion 12.
  • holders 21A and 21B are attached side by side in the circumferential direction.
  • the holders 21 ⁇ / b> A and 21 ⁇ / b> B support the second head portions 14 ⁇ / b> A and 14 ⁇ / b> B so as to be slidable along the outward surface 12 s of the first head portion 12.
  • cylinders 23 that are fixed to the movable table 20 are employed as the holders 21A and 21B, and the second head portions 14A and 14B are vertically moved along the outward surface 12s at the lower ends of the rods of the cylinders 23. It is slidably supported.
  • various structures such as those having a link mechanism can be adopted.
  • the molding process of this example includes a forming step P1, an inlet closing step P2, a joint space opening step P3, a joint space closing step P4, and a connection step P5.
  • FIG. 8 to 10 are cross-sectional views of the molding chamber 11 as viewed from above.
  • the bead core A is drawn with a one-dot chain line.
  • the rear side of the molding chamber 11 is closed using the second head portion 14A, the front side of the molding chamber 11 being open and the rear side being closed by the shutter wall portion 9.
  • the unvulcanized rubber G is caused to flow from the rubber inlet 15 while rotating the bead core A.
  • the bead apex rubber B which has the front-end
  • the second head portion 14A is set to the open state Y1. That is, the second molding wall surface S2 is removed together with the shutter wall portion 9. As a result, a joint space J is formed between the rear end portion Br and the front end portion Bf of the bead apex rubber B and the second molding wall surface S2 side is open.
  • the molding chamber 11 is closed using the second head portion 14B having no shutter wall portion. And That is, the joint space J is closed by the second head portion 14B straddling between the rear end portion Br and the front end portion Bf.
  • connection step P5 the gear pump 4B is operated, and the rubber inlet 15 is opened by the shutter 30 as shown in FIGS. Vulcanized rubber G is introduced.
  • the rear end portion Br and the front end portion Bf are integrally connected by the inflowing rubber.
  • the rubber inlet 15 is close to the rear shutter wall 9, the unvulcanized rubber G from the rubber inlet 15 can easily flow into the joint space J.
  • connection step P5 the gear pump 4B is stopped and the rubber inlet 15 is closed by the shutter 30, and then the second head portion 14B is in the open state Y1, and the bead core member C is taken out.

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

Abstract

Provided is a bead apex rubber forming device which accurately forms bead apex rubber on the outer peripheral surface of a bead core. This bead apex rubber forming device has a forming head which is provided on the outer peripheral surface of a bead core rotatably held by a bead core holding means, and which has a forming chamber surrounded by a first forming wall surface on one axial side and by a second forming wall surface on the other side. The forming head is provided with a first head section and a second head section. The first head section is provided with the first forming wall surface, and a first core receiving surface which is continuous with the first forming wall surface and which receives a core side surface on one side of the bead core. The second head section is provided with the second forming wall surface and a second core receiving surface which is continuous with the second forming wall surface and which receives a core side surface on the other side of the bead core. The first core receiving surface and/or the second core receiving surface is disposed so as to be replaceable with the first head section and/or the second head section.

Description

ビードエーペックスゴム形成装置Bead apex rubber forming device
 本発明は、ビードコアの外周面上に、ビードエーペックスゴムを精度良く形成しうるビードエーペックスゴム形成装置に関する。 The present invention relates to a bead apex rubber forming apparatus capable of accurately forming a bead apex rubber on the outer peripheral surface of a bead core.
 一般に、TOS構造の生タイヤは、下記の工程により形成される。具体的には、図13(A)に示すように、円筒状の成形ドラムa上で、カーカスプライbを巻回し、両端部b1が成形ドラムaからはみ出したカーカス巻回体を形成する。又カーカス巻回体のはみ出し部b1(両端部b1に相当)を、小径に絞り込んだ後、絞り込み部分に、ビードコア部材Cをセットする。ビードコア部材Cでは、ビードコアAの外周面にビードエーペックスゴムBが一体に貼り付けられている。その後、図13(B)に示すように、ターンアップブラダー等(図示省略)を用い、前記はみ出し部b1が、ビードコア部材Cの周りで折り返される。 Generally, a green tire having a TOS structure is formed by the following steps. Specifically, as shown in FIG. 13A, a carcass ply b is wound on a cylindrical forming drum a to form a carcass winding body in which both end portions b1 protrude from the forming drum a. Further, after narrowing the protruding portion b1 (corresponding to both end portions b1) of the carcass winding body to a small diameter, the bead core member C is set to the narrowed portion. In the bead core member C, a bead apex rubber B is integrally attached to the outer peripheral surface of the bead core A. Thereafter, as shown in FIG. 13B, the protruding portion b1 is folded around the bead core member C using a turn-up bladder or the like (not shown).
 このとき、折り返しに先駆けて、ビードエーペックスゴムBの成形ドラムa上への倒し込みが行われる。そのため、TOS構造では、倒し込みを容易とするために、予めタイヤ軸方向外側に傾斜させた傾斜状態J2のビードエーペックスゴムB(図12(B)に示す)が望まれる。 At this time, the bead apex rubber B is laid down onto the forming drum a prior to turning. Therefore, in the TOS structure, the bead apex rubber B (shown in FIG. 12 (B)) in the inclined state J2 that is inclined in advance in the tire axial direction is desired in order to facilitate the falling.
 これに対して、SOT構造の生タイヤでは、図13(C)に示すように、カーカス巻回体のうち、ビードコア部材C、C間の部分b2がトロイド状にシェーピングされるとともに、はみ出し部b1がビードコア部材Cの周りで巻き上げられる。そのため、SOT構造では、直立状に立ち上がった直立状態J1のビードエーペックスゴムB(図12(A)に示す)が望まれる。 On the other hand, in the raw tire having the SOT structure, as shown in FIG. 13C, the portion b2 between the bead core members C and C of the carcass wound body is shaped like a toroid and the protruding portion b1. Is rolled up around the bead core member C. Therefore, in the SOT structure, the bead apex rubber B (shown in FIG. 12A) in the upright state J1 rising upright is desired.
 他方、下記の特許文献1、2には、軸心周りで回転するビードコアの外周面に、ビードエーペックスゴムを一体に形成するビードエーペックスゴム形成装置が提案されている。 On the other hand, the following Patent Documents 1 and 2 propose a bead apex rubber forming apparatus in which a bead apex rubber is integrally formed on the outer peripheral surface of a bead core that rotates around an axis.
 しかし上記提案の形成装置では、ビードコアAの外周面上に、直立状態J1のビードエーペックスゴムBしか形成することができない。そのため、TOS構造用のビードコア部材Cを形成するためには、一旦SOT構造用のビードコア部材Cを形成した後、それを金型内に投入して、ビードエーペックスゴムBを傾斜状態J2に成形する工程が必要となる。そのため、生産効率を損ねるとともに、設備コストの増大を招く。 However, with the proposed forming apparatus, only the bead apex rubber B in the upright state J1 can be formed on the outer peripheral surface of the bead core A. Therefore, in order to form the bead core member C for the TOS structure, after forming the bead core member C for the SOT structure once, it is put into a mold, and the bead apex rubber B is molded into the inclined state J2. A process is required. Therefore, the production efficiency is impaired and the equipment cost is increased.
特開2013-237224号公報JP 2013-237224 A 特許第6242460号公報Japanese Patent No. 6242460
 本発明は、例えば直立状態のビードエーペックスゴム、及び傾斜状態のビードエーペックスゴムを、ビードコアの外周面上に選択的に形成でき、生産効率の向上と、設備コストの低減とを図りうるビードエーペックスゴム形成装置を提供することを課題としている。 In the present invention, for example, a bead apex rubber in an upright state and a bead apex rubber in an inclined state can be selectively formed on the outer peripheral surface of the bead core, thereby improving the production efficiency and reducing the equipment cost. An object is to provide a forming apparatus.
 本発明は、ビードコアの外周面に、ビードエーペックスゴムを一周に亘って連続して形成するビードエーペックスゴム形成装置であって、
 前記ビードコアを、その軸心周りで回転可能に保持するビードコア保持手段、
 及び、ゴム押出機に取り付くとともに、前記ビードコアの外周面上に、ゴム流入口を有する軸心方向一方側の第1の成形壁面と、他方側の第2の成形壁面とで囲まれて周方向にのびるビードエーペックスゴム成形用の成形室を形成する成形ヘッドを具えるとともに、
 前記成形ヘッドは、
  前記第1の成形壁面と、この第1成形壁面に連なりかつビードコアの軸心方向一方側のコア側面を受ける第1のコア受面とを具える第1のヘッド部、
  及び、前記第2の成形壁面と、この第2の成形壁面に連なりかつビードコアの軸心方向他方側のコア側面を受ける第2のコア受面とを具える第2のヘッド部を具え、
 前記第1、第2のコア受面のうちの少なくとも一方のコア受面は、第1、第2のヘッド部のうちの少なくとも一方のヘッド部に交換可能に配される。
The present invention is a bead apex rubber forming device that continuously forms a bead apex rubber over the circumference on the outer peripheral surface of the bead core,
A bead core holding means for holding the bead core rotatably about its axis;
And it attaches to a rubber extruder, and is surrounded by a first molding wall surface on one side in the axial direction having a rubber inlet and a second molding wall surface on the other side on the outer circumferential surface of the bead core. It has a molding head that forms a molding chamber for bead apex rubber molding,
The molding head is
A first head portion comprising the first molding wall surface and a first core receiving surface that is continuous with the first molding wall surface and receives a core side surface on one side in the axial direction of the bead core;
And a second head portion comprising the second molding wall surface and a second core receiving surface that is connected to the second molding wall surface and receives the core side surface on the other axial side of the bead core,
At least one core receiving surface of the first and second core receiving surfaces is replaceably disposed on at least one head portion of the first and second head portions.
 本発明に係るビードエーペックスゴム形成装置では、前記第1のヘッド部は、前記第1のコア受面を有する交換部材と、この交換部材を取り付けるヘッド主部とを具えるのが好ましい。 In the bead apex rubber forming apparatus according to the present invention, the first head portion preferably includes an exchange member having the first core receiving surface and a head main portion to which the exchange member is attached.
 本発明に係るビードエーペックスゴム形成装置では、前記交換部材は、前記第1の成形壁面に対する前記第1のコア受面の角度αを違えた複数種類の交換部材の群から選択されて、前記ヘッド主部に取り付けられるのが好ましい。 In the bead apex rubber forming apparatus according to the present invention, the replacement member is selected from a group of a plurality of types of replacement members having different angles α of the first core receiving surface with respect to the first molding wall surface, and the head It is preferably attached to the main part.
 本発明に係るビードエーペックスゴム形成装置では、前記複数種類の交換部材の群は、前記角度αが0°の基準交換部材を含むのが好ましい。 In the bead apex rubber forming apparatus according to the present invention, it is preferable that the group of the plurality of types of replacement members includes a reference replacement member having an angle α of 0 °.
 本発明に係るビードエーペックスゴム形成装置では、前記ビードコア保持手段は、前記ビードコアの軸心を含む子午断面において、ビードコアの軸心と直角な基準面が前記第1の成形壁面に対して角度βで傾斜する状態でビードコアを保持可能とするのが好ましい。 In the bead apex rubber forming apparatus according to the present invention, the bead core holding means has a reference plane perpendicular to the bead core axis at an angle β with respect to the first molding wall surface in a meridional section including the bead core axis. It is preferable that the bead core can be held in an inclined state.
 本発明に係るビードエーペックスゴム形成装置では、前記角度βは前記角度αと等しいのが好ましい。 In the bead apex rubber forming apparatus according to the present invention, the angle β is preferably equal to the angle α.
 本発明に係るビードエーペックスゴム形成装置では、前記ビードコア保持手段は、前記角度βを変化可能とするのが好ましい。 In the bead apex rubber forming apparatus according to the present invention, it is preferable that the bead core holding means can change the angle β.
 本発明は叙上の如く、第1、第2のコア受面のうちの少なくとも一方のコア受面が、第1、第2のヘッド部のうちの少なくとも一方のヘッド部に交換可能に配される。そのため、コア受面の交換により、成形室に対して、コア受面によって保持されるビードコアの軸心方向の姿勢を変化させることができる。即ち、ビードコアに対して、成形室によって成形されるビードエーペックスゴムの軸心方向の姿勢を軸心方向に変化させることができる。 In the present invention, as described above, at least one core receiving surface of the first and second core receiving surfaces is replaceably disposed on at least one head portion of the first and second head portions. The Therefore, the attitude of the bead core held by the core receiving surface in the axial direction can be changed with respect to the molding chamber by exchanging the core receiving surface. That is, the attitude of the bead apex rubber molded by the molding chamber in the axial direction relative to the bead core can be changed in the axial direction.
 従って、例えば直立状態のビードエーペックスゴム、及び傾斜状態のビードエーペックスゴムを、ビードコアの外周面上に選択的に形成することが可能となり、生産効率の向上と、設備コストの低減とを図ることができる。 Accordingly, for example, an upright bead apex rubber and an inclined bead apex rubber can be selectively formed on the outer peripheral surface of the bead core, thereby improving production efficiency and reducing equipment costs. it can.
本発明のビードエーペックスゴム形成装置の主要部を拡大した部分側面図である。It is the partial side view to which the principal part of the bead apex rubber forming apparatus of this invention was expanded. ビードエーペックスゴム形成装置の主要部の斜視図である。It is a perspective view of the principal part of a bead apex rubber forming apparatus. 成形室を示す子午断面図である。It is meridional sectional drawing which shows a molding chamber. (A)は第1のヘッド部の子午断面図、(B)は第1のヘッド部を第2のヘッド部側から見た正面図である。(A) is a meridional sectional view of the first head portion, and (B) is a front view of the first head portion as viewed from the second head portion side. (A)は第2のヘッド部の子午断面図、(B)は第2のヘッド部を第1のヘッド部側から見た裏面図である。(A) is a meridional sectional view of the second head portion, and (B) is a back view of the second head portion as viewed from the first head portion side. (A)はシャッタ壁部を有する第2のヘッド部の斜視図、(B)はシャッタ壁部無しの第2のヘッド部の斜視図である。(A) is a perspective view of the 2nd head part which has a shutter wall part, (B) is a perspective view of the 2nd head part without a shutter wall part. 基準交換部材を用いた第1のヘッド部の子午断面図である。It is meridional sectional drawing of the 1st head part which used the reference | standard exchange member. (A)、(B)は形成ステップを説明する上方から見た断面図である。(A), (B) is sectional drawing seen from the top explaining a formation step. (A)は流入口閉止ステップ、(B)は継ぎ空間開放ステップを説明する上方から見た断面である。(A) is an inflow port closing step, and (B) is a cross section viewed from above for explaining a joint space opening step. (A)は継ぎ空間閉止ステップ、(B)~(C)は接続ステップを説明する上方から見た断面である。(A) is a joint space closing step, and (B) to (C) are cross sections seen from above for explaining the connection step. (A)、(B)は保持手段の一例を示す側面図及び正面図である。(A), (B) is the side view and front view which show an example of a holding means. (A)、(B)は直立状態及び傾斜状態のビードエーペックスゴムを示す断面図である。(A), (B) is sectional drawing which shows the bead apex rubber of an upright state and an inclination state. (A)、(B)はTOS構造の生タイヤの形成工程の一部を説明する断面図、(C)はSOT構造の生タイヤの形成工程の一部を説明する断面図である。(A), (B) is sectional drawing explaining a part of formation process of the green tire of a TOS structure, (C) is sectional drawing explaining a part of formation process of the raw tire of a SOT structure.
 以下、本発明の実施の形態について、詳細に説明する。
 図1、2に示すように、本実施形態のビードエーペックスゴム形成装置1(単に形成装置1という場合がある。)は、タイヤ用のビードコアAをその軸心i周りで回転自在に保持するビードコア保持手段2と、ゴム押出機4の先端部に取り付く成形ヘッド5とを具え、ビードコアAの外周面Soに、ビードエーペックスゴムBを一周に亘って連続して形成する。
Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIGS. 1 and 2, a bead apex rubber forming apparatus 1 (sometimes simply referred to as a forming apparatus 1) of the present embodiment is a bead core that holds a bead core A for a tire so as to be rotatable around its axis i. The holding means 2 and a molding head 5 attached to the tip of the rubber extruder 4 are provided, and the bead apex rubber B is continuously formed on the outer peripheral surface So of the bead core A over the entire circumference.
 前記ゴム押出機4としては、特に規制されることがなく、周知構造のものが適宜採用しうる。本例では、スクリュ式の押出機本体4Aの先端に、ギヤーポンプ4Bを接続したものが採用される。このゴム押出機4は、ギヤーポンプ4Bのオン、オフに応じて、未加硫ゴムGを成形ヘッド5に供給しうる。 The rubber extruder 4 is not particularly limited, and a known structure can be appropriately employed. In this example, a screw type extruder main body 4A having a gear pump 4B connected to the tip thereof is employed. The rubber extruder 4 can supply the unvulcanized rubber G to the molding head 5 according to whether the gear pump 4B is turned on or off.
 前記ビードコア保持手段2は、図1に示すように、ビードコアAの軸心iを含む例えば垂直な子午断面において、前記軸心iと直角な基準面Xが、後述する第1の成形壁面S1に対して角度βで傾斜する状態でビードコアAを保持しうる。なお前記子午断面は、第1の成形壁面S1と直交している。又ビードコア保持手段2は、前記角度βを、0°含んで変化可能に構成される。 As shown in FIG. 1, the bead core holding means 2 has a reference surface X perpendicular to the axis i on a first meridian wall S <b> 1 to be described later, for example, in a vertical meridional section including the axis i of the bead core A. On the other hand, the bead core A can be held in an inclined state at an angle β. The meridional section is orthogonal to the first molding wall surface S1. The bead core holding means 2 is configured to be variable including the angle β of 0 °.
 具体的には、ビードコア保持手段2は、ビードコアAを軸心i周りで回転可能に保持する保持具40と、保持具40によって保持されたビードコアAの前記角度βを変化させうる傾動具42とを少なくとも含む。 Specifically, the bead core holding means 2 includes a holder 40 that rotatably holds the bead core A around the axis i, and a tilting tool 42 that can change the angle β of the bead core A held by the holder 40. At least.
 本例ではビードコア保持手段2は、保持具40を前記基準面Xに沿って昇降移動させうる昇降台41、及び傾動具42をFx方向に移動させうる移動台43をさらに具える。Fx方向とは、前記子午断面(子午面)に沿って例えば水平方向にのびる向きであって、本例では、第1の成形壁面S1と直交している。 In this example, the bead core holding means 2 further includes a lifting table 41 that can move the holding tool 40 up and down along the reference plane X, and a moving table 43 that can move the tilting tool 42 in the Fx direction. The Fx direction is a direction extending, for example, in the horizontal direction along the meridional section (meridional plane), and is orthogonal to the first molding wall surface S1 in this example.
 保持具40は、本例では、ビードコアAの内周面を受ける互いに平行な複数本(本例では4本)のローラ40aを具える。各ローラ40aは、昇降台41に、回転自在に枢支される。なお各ローラ40aは、拡縮径手段(図示省略)を介して、軸心iを中心とした半径方向内外に移動可能に支持される。これにより、直径が異なる種々のサイズのビードコアAを、脱着自在に支持できる。拡縮径手段としては、周知の種々な構造が採用しうる。本例では、ローラ40aのうちの一本が、モータに接続され、保持したビードコアAを回転駆動しうる。 In this example, the holder 40 includes a plurality (four in this example) of rollers 40a that receive the inner peripheral surface of the bead core A and are parallel to each other. Each roller 40a is pivotally supported by the elevating table 41 so as to be rotatable. Each roller 40a is supported so as to be movable inward and outward in the radial direction around the axis i through an expansion / contraction diameter means (not shown). Thereby, the bead cores A of various sizes having different diameters can be detachably supported. As the expansion / contraction diameter means, various known structures can be employed. In this example, one of the rollers 40a is connected to a motor and can rotate and hold the held bead core A.
 昇降台41は、傾動台42aに設けたレールに案内され、基準面Xに沿って昇降移動しうる。これにより、成形ヘッド5に合わせて種々のサイズのビードコアAを、高さ調整しうる。 The elevating table 41 is guided by a rail provided on the tilting table 42 a and can move up and down along the reference plane X. Thereby, the height of the bead core A of various sizes can be adjusted according to the molding head 5.
 傾動具42は、移動台43に設ける水平な支軸心Qにより上下方向に傾動可能に支持される傾動台42aを具える。又傾動具42は、傾動台42aを傾動させる駆動具42bを含み、これにより角度βを変化させうる。本例では、駆動具42cとしてシリンダを用いた場合が示される。しかし、駆動具42bとして、ボールネジ機構、及びリンク機構など周知の構造を採用することができる。 The tilting tool 42 includes a tilting table 42a supported by a horizontal support shaft center Q provided on the movable table 43 so as to be tiltable in the vertical direction. Further, the tilting tool 42 includes a driving tool 42b for tilting the tilting table 42a, whereby the angle β can be changed. In this example, the case where a cylinder is used as the driving tool 42c is shown. However, a known structure such as a ball screw mechanism and a link mechanism can be employed as the driving tool 42b.
 図3に示すように、回転するビードコアAは、その周方向の一部が成形ヘッド5内を通過する。成形ヘッド5には、通過するビードコアAの外周面So上に、この成形ヘッド5の軸心方向一方側の第1の成形壁面S1と、他方側の第2の成形壁面S2とで囲まれて周方向にのびる断面三角形状の成形室11が設けられる。 As shown in FIG. 3, the rotating bead core A partially passes through the molding head 5 in the circumferential direction. The molding head 5 is surrounded by the first molding wall surface S1 on one side in the axial direction of the molding head 5 and the second molding wall surface S2 on the other side on the outer peripheral surface So of the passing bead core A. A forming chamber 11 having a triangular cross section extending in the circumferential direction is provided.
 具体的には、成形ヘッド5は、前記ゴム押出機4の先端部に固定されるヘッド本体である第1のヘッド部12と、この第1のヘッド部12に保持手段13(図1に示す)を介して支持される成形ダイである第2のヘッド部14とを含む。 Specifically, the molding head 5 includes a first head portion 12 which is a head main body fixed to the tip portion of the rubber extruder 4, and a holding means 13 (shown in FIG. 1). And a second head portion 14 which is a molding die supported through the second die portion 14.
 第1のヘッド部12は、Fx方向に面する外向き面12sにより、前記第1の成形壁面S1を形成している。この第1の成形壁面S1には、ゴム押出機4からの未加硫ゴムGを成形室11内に流入させるゴム流入口15が形成される。 The first head portion 12 forms the first molding wall surface S1 by an outward surface 12s facing in the Fx direction. A rubber inflow port 15 through which unvulcanized rubber G from the rubber extruder 4 flows into the molding chamber 11 is formed on the first molding wall surface S1.
 又第1のヘッド部12は、第1の成形壁面S1に連なる第1のコア受面45をさらに具える。第1のコア受面45は、ビードコアAの軸心方向一方側のコア側面As1を受けて保持する。 The first head portion 12 further includes a first core receiving surface 45 that is continuous with the first molding wall surface S1. The first core receiving surface 45 receives and holds the core side surface As1 on one side in the axial center direction of the bead core A.
 図4に示すように、第1のヘッド部12は、ゴム流入口15を開閉するためのシャッタ30をさらに具える。シャッタ30は、例えば板状をなし、後述するシャッタ壁部9(図5(B)に示す)よりも前方側(ビードコアAの回転方向の前方側)で、前後にスライド移動することで、ゴム流入口15を開閉する。本例では、第1の成形壁面S1に、シャッタ30を案内するガイド溝31が凹設される。このガイド溝31の溝底に、ゴム流入口15が開口する。シャッタ30は、図2に示すように、移動手段32によって作動する。本例の移動手段32は、第1のヘッド部12の側面に取付け板33を介して支持されるシリンダ32Aであり、そのロッド端に、シャッタ30が取り付く。 As shown in FIG. 4, the first head unit 12 further includes a shutter 30 for opening and closing the rubber inflow port 15. The shutter 30 has, for example, a plate shape, and slides back and forth on the front side (front side in the rotational direction of the bead core A) of a shutter wall portion 9 (shown in FIG. 5B), which will be described later. The inlet 15 is opened and closed. In this example, a guide groove 31 for guiding the shutter 30 is provided in the first molding wall surface S1. A rubber inflow port 15 opens at the groove bottom of the guide groove 31. The shutter 30 is actuated by moving means 32 as shown in FIG. The moving means 32 of this example is a cylinder 32A supported on the side surface of the first head portion 12 via a mounting plate 33, and the shutter 30 is attached to the rod end thereof.
 第2のヘッド部14は、図6(A)、(B)に示すように、シャッタ壁部9を有する第2のヘッド部14Aと、シャッタ壁部無しの第2のヘッド部14Bとから構成される。 As shown in FIGS. 6A and 6B, the second head portion 14 includes a second head portion 14A having a shutter wall portion 9 and a second head portion 14B having no shutter wall portion. Is done.
 第2のヘッド部14Aは、図3、5に示すように、成形室11を形成するための前記第2の成形壁面S2と、この第2の成形壁面S2に連なる第2のコア受面46とを具える。第2のコア受面46は、ビードコアAの軸心方向他方側のコア側面As2を受けて保持する。又第2のヘッド部14Aは、第2の成形壁面S2から突出するシャッタ壁部9をさらに具える。シャッタ壁部9は、ゴム流入口15よりも後方側(ビードコアAの回転方向の後方側)で、成形室11を閉じる。シャッタ壁部9は、ゴム流入口15に近接して配されることが好ましく、シャッタ壁部9とゴム流入口15との間の周方向の距離L(図5(A)に示す)は1mm以下が好ましい。 As shown in FIGS. 3 and 5, the second head portion 14 </ b> A includes the second molding wall surface S <b> 2 for forming the molding chamber 11, and the second core receiving surface 46 connected to the second molding wall surface S <b> 2. With. The second core receiving surface 46 receives and holds the core side surface As2 on the other side in the axial direction of the bead core A. The second head portion 14A further includes a shutter wall portion 9 protruding from the second molding wall surface S2. The shutter wall 9 closes the molding chamber 11 on the rear side (the rear side in the rotation direction of the bead core A) from the rubber inlet 15. The shutter wall 9 is preferably disposed in the vicinity of the rubber inlet 15, and the circumferential distance L (shown in FIG. 5A) between the shutter wall 9 and the rubber inlet 15 is 1 mm. The following is preferred.
 第2のヘッド部14B(図6(B)に示す)は、シャッタ壁部9を具えないこと、及び第2のヘッド部14Aに比して、周方向の長さが後方側(ビードコアAの回転方向の後方側)に長い点で、第2のヘッド部14Aと相違している。 The second head portion 14B (shown in FIG. 6B) does not include the shutter wall portion 9, and the length in the circumferential direction on the rear side (bead core A is smaller than that of the second head portion 14A). This is different from the second head portion 14A in that it is long on the rear side in the rotation direction.
 そして、図3、4に示すように、第1、第2のコア受面45、46のうちの少なくとも一方のコア受面は、第1、第2のヘッド部12、14のうちの少なくとも一方のヘッド部に交換可能に配されている。 3 and 4, at least one of the first and second core receiving surfaces 45 and 46 is at least one of the first and second head portions 12 and 14. It is arranged to be replaceable in the head part.
 本例では、第1のコア受面45が、第1のヘッド部12に交換可能に配されている場合が示される。 In this example, a case where the first core receiving surface 45 is arranged on the first head unit 12 in an exchangeable manner is shown.
 具体的には、第1のヘッド部12は、第1のコア受面45を有する交換部材50と、この交換部材50を交換可能に取り付けるヘッド主部51とを具える。本例の交換部材50は、第1の成形壁面S1の一部を構成する壁面部分S1aと、この壁面部分S1aに連なる第1のコア受面45とを含む。又本例の交換部材50は、例えばボルト52によってヘッド主部51に脱着自在に取り付く。ヘッド主部51には、第1の成形壁面S1の残部を構成する壁面部分S1bが配されている。 Specifically, the first head portion 12 includes an exchange member 50 having a first core receiving surface 45 and a head main portion 51 to which the exchange member 50 is attached in a replaceable manner. The replacement member 50 of this example includes a wall surface portion S1a that constitutes a part of the first molding wall surface S1, and a first core receiving surface 45 that is continuous with the wall surface portion S1a. Further, the replacement member 50 of the present example is detachably attached to the head main portion 51 with, for example, a bolt 52. The head main portion 51 is provided with a wall surface portion S1b that constitutes the remaining portion of the first molding wall surface S1.
 ここで、交換部材50は、第1の成形壁面S1に対する第1のコア受面45の角度αを違えた複数種類の交換部材の群50gから選択されて、ヘッド主部51に取り付けられる。 Here, the replacement member 50 is selected from a group 50g of a plurality of types of replacement members having different angles α of the first core receiving surface 45 with respect to the first molding wall surface S1, and attached to the head main portion 51.
 複数種類の交換部材の群50gは、基準交換部材50A(図7に示す)と、傾斜交換部材50B(図3~5に示す)とを含む。 The group 50g of a plurality of types of replacement members includes a reference replacement member 50A (shown in FIG. 7) and an inclined replacement member 50B (shown in FIGS. 3 to 5).
 図7に示すように、基準交換部材50Aは、前記角度αが0°、即ち、第1の成形壁面S1と第1のコア受面45とが面一で連なる交換部材である。この基準交換部材50Aを用いることにより、図12(A)に示す直立状態J1のビードエーペックスゴムBを有するビードコア部材Cを形成することができる。直立状態J1とは、ビードエーペックスゴムBの頂部eが、コア側面As1、As2間の範囲内に位置する状態を意味する。 As shown in FIG. 7, the reference exchange member 50A is an exchange member in which the angle α is 0 °, that is, the first molding wall surface S1 and the first core receiving surface 45 are flush with each other. By using this reference replacement member 50A, a bead core member C having a bead apex rubber B in an upright state J1 shown in FIG. 12A can be formed. The upright state J1 means a state in which the top portion e of the bead apex rubber B is located within the range between the core side surfaces As1 and As2.
 図3に示すように、傾斜交換部材50Bは、第1のコア受面45が第1の成形壁面S1に対して0°以外の角度αで傾斜した交換部材である。この傾斜交換部材50Bを用いることにより、図12(B)に示す傾斜状態J2のビードエーペックスゴムBを有するビードコア部材Cを形成することができる。なお傾斜状態J2とは、ビードエーペックスゴムBの頂部eが、コア側面As1、As2間の範囲から軸心方向外側に外れる状態を意味する。 As shown in FIG. 3, the tilt replacement member 50B is a replacement member in which the first core receiving surface 45 is tilted at an angle α other than 0 ° with respect to the first molding wall surface S1. By using the inclined replacement member 50B, the bead core member C having the bead apex rubber B in the inclined state J2 shown in FIG. 12B can be formed. The inclined state J2 means a state in which the apex e of the bead apex rubber B deviates outward in the axial direction from the range between the core side surfaces As1 and As2.
 交換部材50の前記角度αと、ビードコア保持手段2による前記角度β(図1に示す)とは等しい。 The angle α of the replacement member 50 is equal to the angle β (shown in FIG. 1) by the bead core holding means 2.
 直立状態J1及び傾斜状態J2のビードエーペックスゴムBを切り替えて形成する際には、第2のコア受面46も第1のコア受面45に合わせて変更する必要がある。しかし、第2のヘッド部14は小型であり、しかもビードエーペックスゴムBの高さなどに合わせて第2の成形壁面S2も変更する必要がある。従って、本例では、第2のコア受面46は、第2のヘッド部14に一体に形成され、第2のヘッド部14ごと交換している。しかし、第1のヘッド部12と同様に、第2のヘッド部14は、第2のコア受面46を有する交換部材(図示省略)と、この交換部材を取り付けるヘッド主部(図示省略)とで構成されても良い。 When the bead apex rubber B in the upright state J1 and the inclined state J2 is switched and formed, the second core receiving surface 46 also needs to be changed in accordance with the first core receiving surface 45. However, the second head portion 14 is small, and it is necessary to change the second molding wall surface S2 in accordance with the height of the bead apex rubber B or the like. Therefore, in this example, the second core receiving surface 46 is formed integrally with the second head portion 14 and is exchanged together with the second head portion 14. However, like the first head unit 12, the second head unit 14 includes an exchange member (not shown) having the second core receiving surface 46, and a head main part (not shown) to which the exchange member is attached. It may be constituted by.
 図11(A)、(B)に示すように、第2のヘッド部14A、14Bは、それぞれ保持手段13を介して、成形室11の第2の成形壁面S2側が開放する開状態Y1と、第2の成形壁面S2側が閉じて成形室11を形成する閉状態Y2との間を移動可能に支持される。 As shown in FIGS. 11A and 11B, each of the second head portions 14A and 14B has an open state Y1 in which the second molding wall surface S2 side of the molding chamber 11 is opened via the holding means 13, respectively. The second molding wall surface S2 side is closed and supported so as to be movable between a closed state Y2 in which the molding chamber 11 is formed.
 本例では、保持手段13は、第1のヘッド部12上に、周方向に移動可能な移動台20を具える。この移動台20上には、保持具21A、21Bが周方向に並んで取り付けられる。保持具21A、21Bは、それぞれ第2のヘッド部14A、14Bを、第1のヘッド部12の前記外向き面12sに沿ってスライド移動可能に支持する。保持具21A、21Bとして、本例では、移動台20に固定されるシリンダ23が採用され、各シリンダ23のロッド下端に、第2のヘッド部14A、14Bが外向き面12sに沿って上下にスライド移動可能に支持されている。なお保持手段13として、例えばリンク機構を有するものなど種々な構造が採用しうる。 In this example, the holding means 13 includes a movable table 20 that can move in the circumferential direction on the first head portion 12. On the moving table 20, holders 21A and 21B are attached side by side in the circumferential direction. The holders 21 </ b> A and 21 </ b> B support the second head portions 14 </ b> A and 14 </ b> B so as to be slidable along the outward surface 12 s of the first head portion 12. In this example, cylinders 23 that are fixed to the movable table 20 are employed as the holders 21A and 21B, and the second head portions 14A and 14B are vertically moved along the outward surface 12s at the lower ends of the rods of the cylinders 23. It is slidably supported. As the holding means 13, various structures such as those having a link mechanism can be adopted.
 次に、形成装置1を用いたビードエーペックスゴムBの形成方法(単に形成方法という場合がある。)を説明する。 Next, a method for forming the bead apex rubber B using the forming apparatus 1 (sometimes simply referred to as a forming method) will be described.
 この形成方法では、図3に略示するように、成形室11内に未加硫ゴムGを流入させることにより、回転するビードコアAの外周面SoにビードエーペックスゴムBを一体に形成する成形行程を具える。 In this forming method, as schematically shown in FIG. 3, a molding step of integrally forming the bead apex rubber B on the outer peripheral surface So of the rotating bead core A by allowing the unvulcanized rubber G to flow into the molding chamber 11. With
 本例の成形行程は、形成ステップP1、流入口閉止ステップP2、継ぎ空間開放ステップP3、継ぎ空間閉止ステップP4、及び接続ステップP5を含む。 The molding process of this example includes a forming step P1, an inlet closing step P2, a joint space opening step P3, a joint space closing step P4, and a connection step P5.
 図8~10は、成形室11を上方から見た断面図であって、便宜上、ビードコアAを一点鎖線で描いている。図8(A)に示すように、形成ステップP1は、第2のヘッド部14Aを用い、成形室11の前方側が開放しかつ後方側がシャッタ壁部9によって閉じられた成形室11の後方閉止状態Rで行われる。この後方閉止状態Rにおいて、ビードコアAを回転させながら未加硫ゴムGをゴム流入口15から流入させる。これにより、先端部Bfを有するビードエーペックスゴムBが次第に形成されていく。 8 to 10 are cross-sectional views of the molding chamber 11 as viewed from above. For convenience, the bead core A is drawn with a one-dot chain line. As shown in FIG. 8A, in the forming step P1, the rear side of the molding chamber 11 is closed using the second head portion 14A, the front side of the molding chamber 11 being open and the rear side being closed by the shutter wall portion 9. Done in R. In the rear closed state R, the unvulcanized rubber G is caused to flow from the rubber inlet 15 while rotating the bead core A. Thereby, the bead apex rubber B which has the front-end | tip part Bf is formed gradually.
 次に、流入口閉止ステップP2では、図8(B)に示すように、ビードコアAが略一周して前記先端部Bfがシャッタ壁部9に接近したとき、ビードコア保持手段2によりビードコアAの回転を停止させる。 Next, in the inlet closing step P2, as shown in FIG. 8 (B), when the bead core A substantially goes around and the tip Bf approaches the shutter wall 9, the bead core holding means 2 rotates the bead core A. Stop.
 この回転停止に同期して、ギヤーポンプ4Bを一旦停止する。しかし、停止後も、ゴム流路の内圧により、ゴム流入口15からゴムが漏れ出る傾向がある。そのため図9(A)に示すように、シャッタ30によりゴム流入口15を一旦閉止し、ゴム流入口15からのゴムの漏れを阻止する。シャッタ30は、シャッタ壁部9よりも前方側でスライド移動するため、シャッタ壁部9と干渉することが無く、円滑な開閉動作を行いうる。 ¡Synchronously with this rotation stop, the gear pump 4B is temporarily stopped. However, even after stopping, the rubber tends to leak from the rubber inlet 15 due to the internal pressure of the rubber flow path. Therefore, as shown in FIG. 9A, the rubber inlet 15 is temporarily closed by the shutter 30 to prevent rubber leakage from the rubber inlet 15. Since the shutter 30 slides in front of the shutter wall 9, the shutter 30 does not interfere with the shutter wall 9 and can be smoothly opened and closed.
 次に、継ぎ空間開放ステップP3では、図9(B)に示すように、シャッタ30によるゴム流入口15の閉止状態において、第2のヘッド部14Aを開状態Y1とする。即ち、第2の成形壁面S2をシャッタ壁部9とともに取り外す。これにより、ビードエーペックスゴムBの後端部Brと先端部Bfとの間に、第2の成形壁面S2側が開放した継ぎ空間Jが形成される。 Next, in the joint space opening step P3, as shown in FIG. 9B, in the closed state of the rubber inlet 15 by the shutter 30, the second head portion 14A is set to the open state Y1. That is, the second molding wall surface S2 is removed together with the shutter wall portion 9. As a result, a joint space J is formed between the rear end portion Br and the front end portion Bf of the bead apex rubber B and the second molding wall surface S2 side is open.
 次に、継ぎ空間閉止ステップP4では、図10(A)に示すように、第2のヘッド部14Aに代え、シャッタ壁部無しの第2のヘッド部14Bを用いて成形室11を閉状態Y2とする。即ち、後端部Brと先端部Bfとの間を跨る第2のヘッド部14Bにより前記継ぎ空間Jが閉じられる。 Next, in the joint space closing step P4, as shown in FIG. 10A, instead of the second head portion 14A, the molding chamber 11 is closed using the second head portion 14B having no shutter wall portion. And That is, the joint space J is closed by the second head portion 14B straddling between the rear end portion Br and the front end portion Bf.
 次に、接続ステップP5では、ギヤーポンプ4Bを作動し、かつ図10(B)、(C)に示すように、シャッタ30によりゴム流入口15を開放することで、閉じた継ぎ空間J内に未加硫ゴムGを流入させる。この流入するゴムにより、後端部Brと先端部Bfとが一体に接続される。ここで、ゴム流入口15が後のシャッタ壁部9に近接していることにより、ゴム流入口15からの未加硫ゴムGは、継ぎ空間J内に容易に流入することができる。 Next, in the connection step P5, the gear pump 4B is operated, and the rubber inlet 15 is opened by the shutter 30 as shown in FIGS. Vulcanized rubber G is introduced. The rear end portion Br and the front end portion Bf are integrally connected by the inflowing rubber. Here, since the rubber inlet 15 is close to the rear shutter wall 9, the unvulcanized rubber G from the rubber inlet 15 can easily flow into the joint space J.
 なお接続ステップP5後は、ギヤーポンプ4Bの停止と、シャッタ30によるゴム流入口15の閉止とが行われた後、第2のヘッド部14Bが開状態Y1となり、ビードコア部材Cが取り出される。 After the connection step P5, the gear pump 4B is stopped and the rubber inlet 15 is closed by the shutter 30, and then the second head portion 14B is in the open state Y1, and the bead core member C is taken out.
 以上、本発明の特に好ましい実施形態について詳述したが、本発明は図示の実施形態に限定されることなく、種々の態様に変形して実施しうる。 As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.
1 ビードエーペックスゴム形成装置
2 ビードコア保持手段
4 ゴム押出機
5 成形ヘッド
11 成形室
12 第1のヘッド部
14 第2のヘッド部
15 ゴム流入口
45 第1のコア受面
46 第2のコア受面
50 交換部材
50g 交換部材の群
50A 基準交換部材
51 ヘッド主部
A ビードコア
As1、As2 コア側面
B ビードエーペックスゴム
i 軸心
S1 第1の成形壁面
S2 第2の成形壁面
So ビードコアの外周面
X 基準面
DESCRIPTION OF SYMBOLS 1 Bead apex rubber forming apparatus 2 Bead core holding means 4 Rubber extruder 5 Molding head 11 Molding chamber 12 1st head part 14 2nd head part 15 Rubber inlet 45 1st core receiving surface 46 2nd core receiving surface 50 exchange member 50g exchange member group 50A reference exchange member 51 head main part A bead core As1, As2 core side face B bead apex rubber i shaft center S1 first molding wall surface S2 second molding wall surface outer peripheral surface X reference surface

Claims (7)

  1.  ビードコアの外周面に、ビードエーペックスゴムを一周に亘って連続して形成するビードエーペックスゴム形成装置であって、
     前記ビードコアを、その軸心周りで回転可能に保持するビードコア保持手段、
     及び、ゴム押出機に取り付くとともに、前記ビードコアの外周面上に、ゴム流入口を有する軸心方向一方側の第1の成形壁面と、他方側の第2の成形壁面とで囲まれて周方向にのびるビードエーペックスゴム成形用の成形室を形成する成形ヘッドを具えるとともに、
     前記成形ヘッドは、
      前記第1の成形壁面と、この第1成形壁面に連なりかつビードコアの軸心方向一方側のコア側面を受ける第1のコア受面とを具える第1のヘッド部、
      及び、前記第2の成形壁面と、この第2の成形壁面に連なりかつビードコアの軸心方向他方側のコア側面を受ける第2のコア受面とを具える第2のヘッド部を具え、
     前記第1、第2のコア受面のうちの少なくとも一方のコア受面は、第1、第2のヘッド部のうちの少なくとも一方のヘッド部に交換可能に配されるビードエーペックスゴム形成装置。
    A bead apex rubber forming device that continuously forms a bead apex rubber over the entire circumference of the bead core,
    A bead core holding means for holding the bead core rotatably about its axis;
    And it attaches to a rubber extruder, and is surrounded by a first molding wall surface on one side in the axial direction having a rubber inlet and a second molding wall surface on the other side on the outer circumferential surface of the bead core. It has a molding head that forms a molding chamber for bead apex rubber molding,
    The molding head is
    A first head portion comprising the first molding wall surface and a first core receiving surface that is continuous with the first molding wall surface and receives a core side surface on one side in the axial direction of the bead core;
    And a second head portion comprising the second molding wall surface and a second core receiving surface that is connected to the second molding wall surface and receives the core side surface on the other axial side of the bead core,
    A bead apex rubber forming apparatus in which at least one core receiving surface of the first and second core receiving surfaces is replaceably disposed on at least one of the first and second head portions.
  2.  前記第1のヘッド部は、前記第1のコア受面を有する交換部材と、この交換部材を取り付けるヘッド主部とを具える請求項1記載のビードエーペックスゴム形成装置。 The bead apex rubber forming apparatus according to claim 1, wherein the first head portion includes an exchange member having the first core receiving surface and a head main portion to which the exchange member is attached.
  3.       前記交換部材は、前記第1の成形壁面に対する前記第1のコア受面の角度αを違えた複数種類の交換部材の群から選択されて、前記ヘッド主部に取り付けられる請求項2記載のビードエーペックスゴム形成装置。 3. The bead according to claim 2, wherein the replacement member is selected from a group of a plurality of types of replacement members having different angles α of the first core receiving surface with respect to the first molding wall surface, and is attached to the head main portion. Apex rubber forming device.
  4.  前記複数種類の交換部材の群は、前記角度αが0°の基準交換部材を含む請求項3記載のビードエーペックスゴム形成装置。 The bead apex rubber forming apparatus according to claim 3, wherein the group of the plurality of types of replacement members includes a reference replacement member having the angle α of 0 °.
  5.  前記ビードコア保持手段は、前記ビードコアの軸心を含む子午断面において、ビードコアの軸心と直角な基準面が前記第1の成形壁面に対して角度βで傾斜する状態でビードコアを保持可能とする請求項1~4の何れかに記載のビードエーペックスゴム形成装置。 The bead core holding means can hold the bead core in a meridional section including the axis of the bead core in a state where a reference plane perpendicular to the axis of the bead core is inclined at an angle β with respect to the first molding wall surface. Item 5. The bead apex rubber forming device according to any one of Items 1 to 4.
  6.  前記角度βは前記角度αと等しい請求項5記載のビードエーペックスゴム形成装置。 The bead apex rubber forming apparatus according to claim 5, wherein the angle β is equal to the angle α.
  7.  前記ビードコア保持手段は、前記角度βを変化可能とした請求項5又は6記載のビードエーペックスゴム形成装置。
     
    The bead apex rubber forming apparatus according to claim 5 or 6, wherein the bead core holding means can change the angle β.
PCT/JP2018/015714 2018-04-16 2018-04-16 Bead apex rubber forming device WO2019202636A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457578A (en) * 1977-10-17 1979-05-09 Tokusen Kogyo Kk Method of making beads for tire
JPS58126139A (en) * 1981-12-30 1983-07-27 Yokohama Rubber Co Ltd:The Forming method of bead
JPS60157840A (en) * 1984-01-27 1985-08-19 Sumitomo Rubber Ind Ltd Molding process of bead filler
JPH1170590A (en) * 1997-08-29 1999-03-16 Bridgestone Corp Manufacture of bead filler and filler section molding device
JP2015020425A (en) * 2013-07-23 2015-02-02 株式会社ブリヂストン Method and device of manufacturing bead member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457578A (en) * 1977-10-17 1979-05-09 Tokusen Kogyo Kk Method of making beads for tire
JPS58126139A (en) * 1981-12-30 1983-07-27 Yokohama Rubber Co Ltd:The Forming method of bead
JPS60157840A (en) * 1984-01-27 1985-08-19 Sumitomo Rubber Ind Ltd Molding process of bead filler
JPH1170590A (en) * 1997-08-29 1999-03-16 Bridgestone Corp Manufacture of bead filler and filler section molding device
JP2015020425A (en) * 2013-07-23 2015-02-02 株式会社ブリヂストン Method and device of manufacturing bead member

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