JP6575229B2 - Method for measuring shape of rubber laminate and method for producing pneumatic tire using the same - Google Patents

Method for measuring shape of rubber laminate and method for producing pneumatic tire using the same Download PDF

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JP6575229B2
JP6575229B2 JP2015166112A JP2015166112A JP6575229B2 JP 6575229 B2 JP6575229 B2 JP 6575229B2 JP 2015166112 A JP2015166112 A JP 2015166112A JP 2015166112 A JP2015166112 A JP 2015166112A JP 6575229 B2 JP6575229 B2 JP 6575229B2
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rubber laminate
rubber
shape
measuring
measurement
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JP2017042971A (en
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裕史 山田
裕史 山田
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Sumitomo Rubber Industries Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres

Description

本発明は、ゴム積層体の形状測定方法及びそれを用いた空気入りタイヤの製造方法に関する。   The present invention relates to a method for measuring the shape of a rubber laminate and a method for producing a pneumatic tire using the same.

従来、空気入りタイヤの製造方法においては、成形ドラムの外周面に帯状のゴムストリップが螺旋状に巻き付けられることにより、トレッドゴム等のゴム積層体を形成する工法が知られている。   Conventionally, in a method for manufacturing a pneumatic tire, a method of forming a rubber laminate such as a tread rubber by winding a belt-like rubber strip spirally around an outer peripheral surface of a forming drum is known.

ゴム積層体の断面プロファイルは、加硫タイヤの外観やユニフォミティに影響を及ぼすため、成形ドラムに巻き付けられたゴム積層体の表面形状を測定するための方法として、種々の形状測定方法が提案されている。タイヤの製造工程において、成形ドラムに巻き付けられたゴム積層体は、形状が不安定な未加硫状態にあることから、その測定にあたっては、レーザー光を用いる等、非接触の測定手法を用いるのが望ましい。   Since the cross-sectional profile of the rubber laminate affects the appearance and uniformity of the vulcanized tire, various shape measuring methods have been proposed as methods for measuring the surface shape of the rubber laminate wound around the molding drum. Yes. In the tire manufacturing process, since the rubber laminate wound around the molding drum is in an unvulcanized state with an unstable shape, a non-contact measurement method such as laser light is used for the measurement. Is desirable.

例えば、下記特許文献１では、幅広形状のトレッドゴムに対応するように、複数の二次元のレーザー変位計を成形ドラムの軸方向に配置して、ゴム積層体の表面形状を測定する技術が開示されている。   For example, Patent Document 1 below discloses a technique for measuring the surface shape of a rubber laminate by arranging a plurality of two-dimensional laser displacement meters in the axial direction of a molding drum so as to correspond to a wide tread rubber. Has been.

特開２００７−１０６０９０号公報JP 2007-106090 A

上記レーザー変位計とは、測定対象物にレーザー光を照射し、その反射光を光電変換することにより、予め定められた基準点からゴム積層体の表面までの距離データを取得する光学式の非接触センサーである。レーザー変位計は、精度よく対象物の形状を測定できる反面、高価であるのが難点とされている。そうしたところ、上記特許文献１に記載された方法では、複数のレーザー変位計を必要とするため、コストが嵩むという問題があった。   The laser displacement meter is an optical non-magnetic sensor that obtains distance data from a predetermined reference point to the surface of the rubber laminate by irradiating a measurement object with laser light and photoelectrically converting the reflected light. It is a contact sensor. A laser displacement meter can accurately measure the shape of an object, but it is difficult to be expensive. As a result, the method described in Patent Document 1 requires a plurality of laser displacement meters, and thus has a problem of increasing costs.

本発明は、以上のような実状に鑑み案出されたもので、安価な構成で精度よく、ゴム積層体の表面形状を測定できる形状測定方法及びそれを用いた空気入りタイヤの製造方法を提供することを主たる目的としている。   The present invention has been devised in view of the actual situation as described above, and provides a shape measuring method capable of accurately measuring the surface shape of a rubber laminate with an inexpensive configuration and a method for manufacturing a pneumatic tire using the same. The main purpose is to do.

本願の第１発明は、成形ドラムに巻き付けられた第１の幅を有するゴム積層体の表面形状を測定するための方法であって、前記第１の幅よりも小さい第２の幅を有するレーザー光を前記ゴム積層体に照射し、予め定められた基準点から前記ゴム積層体の表面までの距離データを取得する第１測定工程と、前記第１測定工程では測定できなかった前記ゴム積層体の残りの領域が、前記レーザー光に対向するように、前記成形ドラムを軸方向に移動させる移動工程と、前記ゴム積層体の前記残りの領域に、前記レーザー光を照射して、前記基準点から前記ゴム積層体の表面までの距離データを取得する第２測定工程とを含むことを特徴とする。   1st invention of this application is a method for measuring the surface shape of the rubber laminated body which has the 1st width wound around the forming drum, Comprising: The laser which has a 2nd width smaller than the said 1st width A first measurement step of irradiating the rubber laminate with light to acquire distance data from a predetermined reference point to the surface of the rubber laminate, and the rubber laminate that could not be measured in the first measurement step Moving the molding drum in the axial direction so that the remaining area of the rubber laminate faces the laser beam, and irradiating the remaining area of the rubber laminate with the laser beam, and the reference point And a second measurement step of acquiring distance data from the rubber laminate to the surface of the rubber laminate.

本発明に係る前記形状測定方法において、前記第１測定工程及び前記第２測定工程において、前記距離データを、前記成形ドラムの回転軸を含む平面内で測定することが望ましい。   In the shape measuring method according to the present invention, in the first measuring step and the second measuring step, the distance data is preferably measured within a plane including a rotation axis of the forming drum.

本発明に係る前記形状測定方法において、前記第１測定工程及び前記第２測定工程は、前記ゴム積層体の円周方向の４〜１２箇所において、前記距離データを測定することが望ましい。   In the shape measuring method according to the present invention, it is desirable that the first measuring step and the second measuring step measure the distance data at 4 to 12 locations in the circumferential direction of the rubber laminate.

本発明に係る前記形状測定方法において、前記ゴム積層体は、空気入りタイヤのトレッドゴムを含むことが望ましい。   In the shape measuring method according to the present invention, the rubber laminate preferably includes a tread rubber of a pneumatic tire.

本願の第２発明は、空気入りタイヤの製造方法であって、前記ゴム積層体の形状測定方法によって得られたゴム積層体の断面プロファイルに基づいて、前記ゴム積層体の成形の良否を判断する工程を含むことを特徴とする。   2nd invention of this application is a manufacturing method of a pneumatic tire, Comprising: Based on the cross-sectional profile of the rubber laminated body obtained by the shape measuring method of the said rubber laminated body, the quality of the molding of the said rubber laminated body is judged. Including a process.

第１発明の形状測定方法は、レーザー光を前記ゴム積層体に照射し、予め定められた基準点からゴム積層体の表面までの距離データを取得する第１測定工程と、ゴム積層体の残りの領域に、レーザー光を照射して、基準点からゴム積層体の表面までの距離データを取得する第２測定工程とを含む。さらに、前記残りの領域にレーザー光を照射するために、成形ドラムを軸方向に移動させる移動工程を含む。これにより、第１測定工程では測定できなかった前記残りの領域をレーザー光に対向させることができ、高価なレーザー変位計を複数個用いることなく、ゴム積層体の全領域にわたって表面形状を測定できる。   The shape measuring method of the first invention includes a first measuring step of irradiating the rubber laminate with laser light to obtain distance data from a predetermined reference point to the surface of the rubber laminate, and the remaining rubber laminate. A second measurement step of irradiating the region with laser light and acquiring distance data from the reference point to the surface of the rubber laminate. Furthermore, a moving step of moving the forming drum in the axial direction to irradiate the remaining area with laser light is included. Thereby, the said remaining area | region which was not able to be measured in the 1st measurement process can be made to oppose a laser beam, and a surface shape can be measured over the whole area | region of a rubber laminated body, without using several expensive laser displacement meters. .

第２発明の製造方法は、ゴム積層体の形状測定方法によって得られたゴム積層体の断面プロファイルに基づいて、ゴム積層体の成形の良否を判断する工程を含むので、安価な構成により、加硫タイヤの外観不良やユニフォミティの悪化を抑制することができる。   The manufacturing method of the second invention includes a step of judging the quality of the rubber laminate based on the cross-sectional profile of the rubber laminate obtained by the method for measuring the shape of the rubber laminate. It is possible to suppress the appearance failure of the sulfurized tire and the deterioration of uniformity.

本発明の一実施形態である形状測定方法を実施するための形状測定装置の概略構成を示す側面図である。It is a side view which shows schematic structure of the shape measuring apparatus for enforcing the shape measuring method which is one Embodiment of this invention. 本形状測定方法の手順を示すフローチャートである。It is a flowchart which shows the procedure of this shape measuring method. 図１の形状測定装置の断面図である。It is sectional drawing of the shape measuring apparatus of FIG. 図２の形状測定方法によって測定された距離データをプロットしたグラフである。It is the graph which plotted the distance data measured by the shape measuring method of FIG.

以下、本発明の実施の一形態が図面に基づき説明される。
図１は、本発明の一実施形態である形状測定方法を実施するための形状測定装置１を示している。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a shape measuring apparatus 1 for carrying out a shape measuring method according to an embodiment of the present invention.

形状測定装置１は、円筒状の成形ドラム２と、成形ドラム２の回転軸３と、ゴム積層体１０の表面形状を測定するレーザー変位計４と、回転軸３を軸心３Ａ方向に移動させるための移動手段５等を備える。形状測定装置１は、例えば、空気入りタイヤの成形装置の一部に含まれる。生タイヤの成形にあたって、成形ドラム２を軸心３Ａ方向に移動させるための機構が既に存在している場合、この機構を移動手段５として流用できる。   The shape measuring apparatus 1 moves the cylindrical forming drum 2, the rotating shaft 3 of the forming drum 2, the laser displacement meter 4 for measuring the surface shape of the rubber laminate 10, and the rotating shaft 3 in the direction of the axis 3A. Moving means 5 and the like. The shape measuring apparatus 1 is included in a part of a pneumatic tire molding apparatus, for example. When a green tire is formed, if a mechanism for moving the forming drum 2 in the direction of the axis 3 </ b> A already exists, this mechanism can be used as the moving means 5.

成形ドラム２の外周面には、ゴム積層体１０が巻き付けられる。本実施形態では、ゴム積層体１０は、例えば、空気入りタイヤのトレッドゴムを構成する。すなわち、形状測定装置１は、成形ドラム２に巻き付けられたトレッドゴムの表面形状を測定する。測定されるゴム積層体１０は、トレッドゴムに限られることなく、例えば、サイドウォールゴムやインナーランナーゴム等であってもよい。   A rubber laminate 10 is wound around the outer peripheral surface of the molding drum 2. In the present embodiment, the rubber laminate 10 constitutes a tread rubber of a pneumatic tire, for example. That is, the shape measuring device 1 measures the surface shape of the tread rubber wound around the forming drum 2. The rubber laminate 10 to be measured is not limited to the tread rubber, and may be, for example, a sidewall rubber or an inner runner rubber.

回転軸３は、成形ドラム２を回転可能に支持する。成形ドラム２が回転することにより、成形ドラム２の外周面にゴム積層体１０が巻き付けられ、トレッドゴムが形成される。ゴム積層体１０は、ベース層を構成するゴムストリップ及びキャップ層を構成するゴムストリップが別々に巻き付けられる形態であってもよい。   The rotating shaft 3 supports the forming drum 2 to be rotatable. As the molding drum 2 rotates, the rubber laminate 10 is wound around the outer peripheral surface of the molding drum 2 to form tread rubber. The rubber laminate 10 may have a form in which a rubber strip constituting the base layer and a rubber strip constituting the cap layer are wound separately.

レーザー変位計４は、測定対象物であるゴム積層体１０の表面にレーザー光Ｌ１を照射し、その反射光Ｌ２を光電変換することにより、予め定められた基準点からゴム積層体１０の表面までの距離データを取得する光学式の非接触センサーである。本実施形態のレーザー変位計４は、形状測定装置１の設置面２０に固定されている。   The laser displacement meter 4 irradiates the surface of the rubber laminate 10 as a measurement object with the laser light L1 and photoelectrically converts the reflected light L2 from the predetermined reference point to the surface of the rubber laminate 10. It is an optical non-contact sensor that acquires the distance data. The laser displacement meter 4 of the present embodiment is fixed to the installation surface 20 of the shape measuring device 1.

移動手段５は、回転軸３を支持し、成形ドラム２及び回転軸３を軸心３Ａ方向に移動させる。このため、移動手段５は、設置面２０に対して回転軸３の軸心３Ａ方向に移動可能に構成されている。例えば、移動手段５は、設置面２０に回転軸３の軸心３Ａに沿って平行に敷設されたレール２１上を移動可能なスライドユニット６の上に搭載されている。   The moving means 5 supports the rotating shaft 3 and moves the forming drum 2 and the rotating shaft 3 in the direction of the axis 3A. For this reason, the moving means 5 is configured to be movable in the direction of the axis 3 </ b> A of the rotary shaft 3 with respect to the installation surface 20. For example, the moving means 5 is mounted on a slide unit 6 that can move on a rail 21 that is laid in parallel on the installation surface 20 along the axis 3 </ b> A of the rotary shaft 3.

図２は、本発明の形状測定方法の手順を示すフローチャートである。形状測定方法は、第１測定工程Ｓ１と、移動工程Ｓ２と、第２測定工程Ｓ３とを含む。   FIG. 2 is a flowchart showing the procedure of the shape measuring method of the present invention. The shape measuring method includes a first measuring step S1, a moving step S2, and a second measuring step S3.

第１測定工程Ｓ１は、レーザー光Ｌ１をゴム積層体１０に照射し、予め定められた基準点からゴム積層体１０の表面１０Ａまでの距離データを取得する。基準点とは、レーザー変位計４に定められている距離測定のための原点であり、例えば、レーザー変位計４に設けられているレーザー光源の位置である。   In the first measurement step S1, the rubber laminate 10 is irradiated with the laser beam L1, and distance data from a predetermined reference point to the surface 10A of the rubber laminate 10 is acquired. The reference point is an origin for distance measurement defined in the laser displacement meter 4, for example, a position of a laser light source provided in the laser displacement meter 4.

図３は、第１測定工程Ｓ１でゴム積層体１０の表面形状が測定される様子を示している。本実施形態では、成形ドラム２の外周面に、ベルト補強層１１及びジョイントレスバンド補強層１２が順次巻き付けられ、それらの半径方向外側に、ゴム積層体１０が巻き付けられる。   FIG. 3 shows how the surface shape of the rubber laminate 10 is measured in the first measurement step S1. In the present embodiment, the belt reinforcing layer 11 and the jointless band reinforcing layer 12 are sequentially wound around the outer peripheral surface of the forming drum 2, and the rubber laminate 10 is wound around the radially outer side thereof.

ゴム積層体１０は、例えば、帯状のゴムストリップ１０Ｂが螺旋状に巻き付けられることにより形成されうる。ゴム積層体１０の幅は、第１の幅Ｗ１であり、例えば、２００mm以上である。一方、レーザー光Ｌ１の照射幅は、レーザー変位計４の仕様によって異なり、大きい照射幅（測定領域）で精度よく距離を測定できるレーザー変位計４は、一般的に高価である。そのため、本実施形態では、測定領域が第１の幅Ｗ１よりも小さい第２の幅Ｗ２であるレーザー光Ｌ１を照射するレーザー変位計４が適用されている。これにより、形状測定装置１のコストダウンを図ることができる。   The rubber laminate 10 can be formed, for example, by winding a belt-shaped rubber strip 10B in a spiral shape. The width of the rubber laminate 10 is the first width W1, for example, 200 mm or more. On the other hand, the irradiation width of the laser light L1 varies depending on the specifications of the laser displacement meter 4, and the laser displacement meter 4 capable of measuring the distance with a large irradiation width (measurement region) with high accuracy is generally expensive. Therefore, in this embodiment, the laser displacement meter 4 that irradiates the laser beam L1 whose measurement region is the second width W2 smaller than the first width W1 is applied. Thereby, the cost reduction of the shape measuring apparatus 1 can be aimed at.

既に述べたように、レーザー変位計４の測定領域である第２の幅Ｗ２は、ゴム積層体１０の幅である第１の幅Ｗ１よりも小さい。このため、第１測定工程Ｓ１では測定できなかったゴム積層体１０の残りの領域Ｒが生ずる。   As already described, the second width W <b> 2 that is the measurement region of the laser displacement meter 4 is smaller than the first width W <b> 1 that is the width of the rubber laminate 10. For this reason, the remaining area | region R of the rubber laminated body 10 which was not able to be measured in 1st measurement process S1 arises.

この後、移動工程Ｓ２では、残りの領域Ｒがレーザー光Ｌ１に対向するように、成形ドラム２が軸方向３Ｘに移動される。これにより、ゴム積層体１０の軸方向３Ｘの全領域にわたって、レーザー光Ｌ１が照射可能とされる。   Thereafter, in the moving step S2, the forming drum 2 is moved in the axial direction 3X so that the remaining region R faces the laser beam L1. Thereby, it is possible to irradiate the laser beam L1 over the entire region of the rubber laminate 10 in the axial direction 3X.

そして、第２測定工程Ｓ３では、ゴム積層体１０の残りの領域Ｒに、レーザー光Ｌ１が照射され、基準点からゴム積層体１０の表面１０Ａまでの距離データが取得される。第１測定工程Ｓ１及び第２測定工程Ｓ３によって、ゴム積層体１０の軸方向３Ｘの全領域にわたって、表面１０Ａの形状が測定可能とされる。   In the second measurement step S3, the remaining region R of the rubber laminate 10 is irradiated with the laser light L1, and distance data from the reference point to the surface 10A of the rubber laminate 10 is acquired. Through the first measurement step S1 and the second measurement step S3, the shape of the surface 10A can be measured over the entire region in the axial direction 3X of the rubber laminate 10.

図４は、第１測定工程Ｓ１及び第２測定工程Ｓ３によって測定された距離データをプロットしたグラフである。図４において、横軸は軸方向３Ｘの距離（ゴム積層体１０の幅）であり、縦軸は径方向の距離（ゴム積層体１０の厚さ）である。   FIG. 4 is a graph plotting the distance data measured in the first measurement step S1 and the second measurement step S3. In FIG. 4, the horizontal axis represents the distance in the axial direction 3X (the width of the rubber laminate 10), and the vertical axis represents the radial distance (the thickness of the rubber laminate 10).

移動工程Ｓ２と、第２測定工程Ｓ３とは、同時に実行されていてもよい。この場合、移動工程Ｓ２で、成形ドラム２が軸方向３Ｘに移動されながら、第２測定工程Ｓ３で、ゴム積層体１０の残りの領域Ｒの距離データが取得される。従って、短時間でゴム積層体１０の表面１０Ａの形状を測定することが可能となる。   The movement process S2 and the second measurement process S3 may be performed simultaneously. In this case, distance data of the remaining region R of the rubber laminate 10 is acquired in the second measurement step S3 while the molding drum 2 is moved in the axial direction 3X in the movement step S2. Therefore, it is possible to measure the shape of the surface 10A of the rubber laminate 10 in a short time.

第１測定工程Ｓ１及び第２測定工程Ｓ３では、成形ドラム２の回転を停止して、成形ドラム２の回転軸３の軸心３Ａを含む平面内に、レーザー光Ｌ１が照射されるのが望ましい。これにより、軸心３Ａを含む平面内で、基準点からゴム積層体１０の表面１０Ａまでの距離データが取得されうる。これにより、ゴム積層体１０の軸心３Ａに沿った断面プロファイルが短時間で正確に測定されうる。   In the first measurement step S1 and the second measurement step S3, it is desirable that the rotation of the molding drum 2 is stopped and the laser beam L1 is irradiated in a plane including the axis 3A of the rotation shaft 3 of the molding drum 2. . Thereby, the distance data from the reference point to the surface 10A of the rubber laminate 10 can be acquired in the plane including the axis 3A. Thereby, the cross-sectional profile along the axial center 3A of the rubber laminate 10 can be accurately measured in a short time.

本形状測定方法によれば、第１測定工程Ｓ１では測定できなかった残りの領域Ｒをレーザー光Ｌ１に対向させることができ、高価なレーザー変位計４を複数個用いることなく、ゴム積層体１０の全領域にわたって表面形状を測定できる。   According to this shape measuring method, the remaining region R that could not be measured in the first measuring step S1 can be made to face the laser beam L1, and the rubber laminate 10 can be used without using a plurality of expensive laser displacement meters 4. The surface shape can be measured over the entire area.

なお、レーザー変位計４を軸方向３Ｘに移動させることにより、残りの領域Ｒにレーザー光Ｌ１を照射して距離データを取得することも可能である。しかしながら、この場合、レーザー変位計４の移動に伴って、レーザー変位計４が振動し、距離データに影響を及ぼすおそれがある。本実施形態では、成形ドラム２が軸方向３Ｘに移動され、レーザー変位計４は設置面２０に固定される構成であるため、ゴム積層体１０に対してレーザー光Ｌ１を相対的に移動させる際のレーザー変位計４の振動を抑制できる。これにより、表面形状の測定精度をより一層高めることが可能となる。   It is also possible to acquire distance data by irradiating the remaining region R with the laser light L1 by moving the laser displacement meter 4 in the axial direction 3X. However, in this case, as the laser displacement meter 4 moves, the laser displacement meter 4 may vibrate and affect the distance data. In the present embodiment, since the molding drum 2 is moved in the axial direction 3X and the laser displacement meter 4 is fixed to the installation surface 20, the laser light L1 is moved relative to the rubber laminate 10. The vibration of the laser displacement meter 4 can be suppressed. Thereby, it becomes possible to further improve the measurement accuracy of the surface shape.

本実施形態では、ゴム積層体１０を成形ドラム２の外周面に容易に巻き付けるために、成形ドラム２が回転軸３の回りに回転可能に構成されている。そこで、ゴム積層体１０が巻き付けられた成形ドラム２を所定の角度回転させて、第１測定工程Ｓ１乃至第２測定工程Ｓ３を繰り返すことにより、ゴム積層体１０の円周方向の複数箇所において、距離データが測定されうる。複数箇所の距離データを測定することにより、その平均値や標準偏差を計算し、ゴム積層体１０の成形の良否を統計的に判断することが可能となる。   In the present embodiment, the molding drum 2 is configured to be rotatable around the rotation shaft 3 in order to easily wrap the rubber laminate 10 around the outer peripheral surface of the molding drum 2. Therefore, by rotating the molding drum 2 around which the rubber laminate 10 is wound by a predetermined angle and repeating the first measurement step S1 to the second measurement step S3, at a plurality of locations in the circumferential direction of the rubber laminate 10, Distance data can be measured. By measuring the distance data of a plurality of locations, it is possible to calculate the average value and standard deviation, and to statistically determine whether the rubber laminate 10 is molded.

ゴム積層体１０の円周方向の測定箇所は、４〜１２箇所が望ましい。測定箇所が４箇所未満の場合、隣り合うゴムストリップ１０Ｂの段差によって測定値の平均値にばらつき生じ易く、ゴム積層体１０の成形の良否を正確に判断するのが困難となるおそれがある。一方、測定箇所が１２箇所を超える場合、形状測定に要する時間が長くなり、生産性が低下する。   As for the measurement location of the circumferential direction of the rubber laminated body 10, 4-12 locations are desirable. When the number of measurement locations is less than 4, the average value of the measurement values is likely to vary due to the level difference between the adjacent rubber strips 10B, and it may be difficult to accurately determine whether the rubber laminate 10 is molded. On the other hand, when the number of measurement points exceeds 12, the time required for shape measurement becomes long and the productivity is lowered.

本形状測定方法を含む空気入りタイヤの製造方法では、上述のごとく測定されたゴム積層体１０の断面プロファイルに基づいて、ゴム積層体１０の成形の良否を判断し、良品のみを下流工程に移行させることができる。すなわち、本発明の空気入りタイヤの製造方法は、ゴム積層体１０の断面プロファイルに基づいて、ゴム積層体１０の成形の良否を判断する判断工程を含む。この判断工程では、測定されたゴム積層体１０の断面プロファイルを目標とする断面プロファイルとを比較して、ゴム積層体１０の成形の良否を判断することができる。成形不良が生じたゴム積層体１０は、ゴムストリップ１０Ｂを成形ドラム２等から引き剥がして、再度巻き付ける等の作業を行なうことにより、良品のみを次の工程に移行させることができる。このような空気入りタイヤの製造方法によれば、成形不良が生じた生タイヤの加硫等を行なうことが抑制され、生産性の向上と、加硫タイヤの外観不良やユニフォミティの悪化が抑制されうる。   In the manufacturing method of a pneumatic tire including this shape measuring method, the quality of the rubber laminate 10 is determined based on the cross-sectional profile of the rubber laminate 10 measured as described above, and only good products are transferred to the downstream process. Can be made. That is, the method for manufacturing a pneumatic tire according to the present invention includes a determination step of determining whether or not the rubber laminate 10 is molded based on the cross-sectional profile of the rubber laminate 10. In this determination step, it is possible to determine whether the rubber laminate 10 is molded or not by comparing the measured cross-sectional profile of the rubber laminate 10 with a target cross-sectional profile. The rubber laminate 10 in which molding failure has occurred can be transferred only to non-defective products to the next step by performing an operation such as peeling the rubber strip 10B from the molding drum 2 or the like and winding it again. According to such a method for manufacturing a pneumatic tire, it is possible to suppress vulcanization or the like of a raw tire in which a molding failure has occurred, and to improve productivity, and to suppress deterioration in appearance and uniformity of the vulcanized tire. sell.

以上、本発明の実施形態が詳細に説明されたが、本発明は上記の具体的な実施形態に限定されることなく種々の態様に変更して実施される。   As mentioned above, although embodiment of this invention was described in detail, this invention is changed and implemented in various aspects, without being limited to said specific embodiment.

図１乃至３に示される形状測定方法を含む空気入りタイヤの製造方法にて、サイズ２３５／４５Ｒ１８の空気入りタイヤが、表１の仕様に基づいて、各例毎に１００本ずつ製造され、生産性、外観性能及びユニフォミティ性能が評価された。トレッド部の表面形状を測定した結果、その断面プロファイルの平均値が、目標とする断面プロファイルから基準値（０．６mm）以上離れている場合は、ゴムストリップが成形ドラム等から引き剥がされた。そして、再度別のゴムストリップが巻き付けられることにより、基準値を満たす良品のみが次の工程に移行された。テスト方法は、以下の通りである。    100 pneumatic tires of size 235 / 45R18 were manufactured for each example according to the specifications in Table 1 and produced by the pneumatic tire manufacturing method including the shape measuring method shown in FIGS. , Appearance performance and uniformity performance were evaluated. As a result of measuring the surface shape of the tread portion, the rubber strip was peeled off from the molding drum or the like when the average value of the cross-sectional profile was more than the reference value (0.6 mm) from the target cross-sectional profile. Then, another rubber strip was wound again, so that only non-defective products satisfying the reference value were transferred to the next step. The test method is as follows.

＜生産性＞
各例毎に、生タイヤの成形に要した時間が測定された。結果は、実施例１を１００とする指数で表され、数値が小さいほど生タイヤの生産性が優れていることを示す。 <Productivity>
For each case, the time required to form the green tire was measured. A result is represented by the index | exponent which makes Example 1 100, and shows that the productivity of a green tire is excellent, so that a numerical value is small.

＜外観性能＞
加硫タイヤのトレッド部の外観が目視にて確認され、ベア発生率が計算された。結果は、実施例１を１００とする指数で表され、数値が小さいほど外観性能が優れていることを示す。 <Appearance performance>
The appearance of the tread portion of the vulcanized tire was visually confirmed, and the bear occurrence rate was calculated. A result is represented by the index | exponent which makes Example 1 100, and shows that external appearance performance is excellent, so that a numerical value is small.

＜ユニフォミティ性能＞
加硫タイヤのＲＦＶが測定され、その１次成分の標準偏差が計算された。数値が小さいほどユニフォミティ性能が優れていることを示す。 <Uniformity performance>
The RFV of the vulcanized tire was measured and the standard deviation of its primary component was calculated. The smaller the value, the better the uniformity performance.

Figure 0006575229
Figure 0006575229

表１から明らかなように、実施例の形状測定方法は、比較例に比べて生産性を妨げることなく、外観性能及びユニフォミティ性能が有意に向上していることが確認できた。   As is apparent from Table 1, it was confirmed that the shape measurement method of the example significantly improved the appearance performance and uniformity performance without hindering the productivity as compared with the comparative example.

２ 成形ドラム
１０ ゴム積層体
１０Ａ 表面
Ｌ１ レーザー光
Ｓ１ 第１測定工程
Ｓ２ 移動工程
Ｓ３ 第２測定工程 2 Molding drum 10 Rubber laminate 10A Surface L1 Laser light S1 First measurement step S2 Moving step S3 Second measurement step

Claims (5)

成形ドラムに巻き付けられた第１の幅を有するゴム積層体の表面形状を測定するための方法であって、
前記成形ドラムの軸方向に沿った平面内で、前記第１の幅よりも小さい第２の幅を有するレーザー光を前記ゴム積層体に照射し、予め定められた基準点から前記ゴム積層体の表面までの距離データを取得する第１測定工程と、
前記第１測定工程では測定できなかった前記ゴム積層体の残りの領域が、前記レーザー光に対向するように、前記成形ドラムを前記軸方向に移動させる移動工程と、
前記ゴム積層体の前記残りの領域に、前記レーザー光を照射して、前記基準点から前記ゴム積層体の表面までの距離データを取得する第２測定工程とを含むことを特徴とするゴム積層体の形状測定方法。 A method for measuring a surface shape of a rubber laminate having a first width wound around a molding drum,
The rubber laminate is irradiated with laser light having a second width smaller than the first width within a plane along the axial direction of the molding drum, and the rubber laminate is irradiated from a predetermined reference point. A first measurement step for obtaining distance data to the surface;
A moving step of moving the molding drum in the axial direction so that the remaining region of the rubber laminate that could not be measured in the first measuring step faces the laser beam;
A second measurement step of irradiating the remaining region of the rubber laminate with the laser beam to obtain distance data from the reference point to the surface of the rubber laminate. Body shape measurement method. 前記第１測定工程及び前記第２測定工程において、前記距離データを、前記成形ドラムの回転軸を含む平面内で測定する請求項１記載のゴム積層体の形状測定方法。   The method for measuring a shape of a rubber laminate according to claim 1, wherein in the first measurement step and the second measurement step, the distance data is measured within a plane including a rotation axis of the molding drum. 前記第１測定工程及び前記第２測定工程は、前記ゴム積層体の円周方向の４〜１２箇所において、前記距離データを測定する請求項１又は２に記載のゴム積層体の形状測定方法。   The shape measurement method for a rubber laminate according to claim 1 or 2, wherein the first measurement step and the second measurement step measure the distance data at 4 to 12 locations in the circumferential direction of the rubber laminate. 前記ゴム積層体は、帯状のゴムストリップが、前記成形ドラムの前記軸方向にずれながら螺旋状に巻き付けられることにより形成される請求項１乃至３のいずれかに記載のゴム積層体の形状測定方法。 4. The method of measuring a shape of a rubber laminate according to claim 1, wherein the rubber laminate is formed by winding a belt-like rubber strip spirally while shifting in the axial direction of the molding drum. 5. . 空気入りタイヤの製造方法であって、
請求項４に記載されたゴム積層体の形状測定方法によって得られたゴム積層体の断面プロファイルに基づいて、前記ゴム積層体の成形の良否を判断する工程を含むことを特徴とする空気入りタイヤの製造方法。 A pneumatic tire manufacturing method comprising:
A pneumatic tire comprising a step of judging whether or not the rubber laminate is molded based on a cross-sectional profile of the rubber laminate obtained by the method for measuring a shape of a rubber laminate according to claim 4. Manufacturing method.
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