JP2010261902A - Tread thickness measuring method and device therefor - Google Patents

Tread thickness measuring method and device therefor Download PDF

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JP2010261902A
JP2010261902A JP2009114690A JP2009114690A JP2010261902A JP 2010261902 A JP2010261902 A JP 2010261902A JP 2009114690 A JP2009114690 A JP 2009114690A JP 2009114690 A JP2009114690 A JP 2009114690A JP 2010261902 A JP2010261902 A JP 2010261902A
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tire
tread
thickness
belt
irradiation device
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JP2010261902A5 (en
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Masafumi Nakagawa
雅文 中川
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device therefor, for measuring automatically a tread thickness of a used tire having a belt formed by laminating one or more belt layers on which cords comprising organic fibers are arrayed, and the tread. <P>SOLUTION: In this tread thickness measuring method, while moving in the tire radial direction, an irradiation device 1 for irradiating a terahertz wave to the axial direction of the tire, intensity of a wave transmitting through the tire is measured on each position in the tire radial direction of the irradiation device 1, and the tread thickness is specified from the measurement result. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、有機繊維よりなるコードを配列したベルト層を１層以上積層してなるベルトとトレッドとを有する使用済みタイヤのトレッドの厚さを測定したあとベルトが露出するまでトレッドをバフしてタイヤを更正するに際し、トレッドの厚さを測定する方法、およびこの測定方法に用いられる装置に関する。   In the present invention, after measuring the tread thickness of a used tire having a belt and a tread formed by laminating one or more belt layers in which cords made of organic fibers are arranged, the tread is buffed until the belt is exposed. The present invention relates to a method for measuring the thickness of a tread when correcting a tire, and an apparatus used for the measurement method.

従来から、航空機用タイヤなど、高価なタイヤにあっては、摩耗により使えなくなった使用済みタイヤに、再度ゴムを貼り付けることにより使用できる状態にする、いわゆるタイヤの更生が行われている。この場合、通常、トレッドにまだ摩耗していない残余の部分があっても、確実にトレッドを新しくすることを目的に、一旦その部分をバフして新しいトレッドゴムをベルトの半径方向外側に貼り付けて加硫することが行われている。自動的にトレッドをバフするためには、バフするトレッド厚さを予め知っておく必要があるが、使用済みタイヤのトレッド残ゴム厚さは一定でないため、その厚さをタイヤごとに測定しなければならず、従来は、トレッドにベルトに達するパイロットホールと呼ばれる確認孔を数カ所、例えば３カ所開け、その深さを測定してトレッドの厚さを特定していた（例えば、特許文献１参照。）。   Conventionally, in the case of expensive tires such as aircraft tires, so-called tire rehabilitation has been performed in which used tires that have become unusable due to wear are put into a usable state by attaching rubber again. In this case, normally, even if there is a remaining part of the tread that has not yet been worn, in order to ensure that the tread is renewed, the tread is temporarily buffed and a new tread rubber is applied to the outside of the belt in the radial direction. Is vulcanized. In order to buff the tread automatically, it is necessary to know the tread thickness to be buffed in advance, but the thickness of the remaining tread rubber of the used tire is not constant, so the thickness must be measured for each tire. In the past, several confirmation holes called pilot holes reaching the belt on the tread, for example, three places, were opened, and the depth was measured to specify the thickness of the tread (see, for example, Patent Document 1). ).

特開２００５−２１９５２３号公報JP 2005-219523 A

しかしながら、パイロットホールを開けるための作業工数、および、パイロットホールによって傷ついたベルトのゴムを修復するための作業工数等が膨大なものとなり、生産性改善のネックとなっていた。   However, the work man-hours for opening the pilot hole and the man-hours for repairing the rubber of the belt damaged by the pilot hole have become enormous, which has been a bottleneck for improving productivity.

もし、ベルトが、重荷重タイヤのようにスチールコードよりなるコードを配列したベルトプライでできている場合には、例えば渦電流センサを用いてベルトの深さ位置を測定することができるが、航空機用タイヤのようにベルトが有機繊維よりなるコードを配列したベルトプライでできている場合には、このようにしてベルトの深さ位置を測定することができず、これに代わる新たな測定方法が求められていた。   If the belt is made of a belt ply in which steel cords are arranged like heavy-duty tires, the depth position of the belt can be measured using, for example, an eddy current sensor. When the belt is made of a belt ply in which cords made of organic fibers are arranged like a tire for a vehicle, the depth position of the belt cannot be measured in this way, and a new measurement method can be used instead. It was sought after.

本発明は、このような問題に鑑みてなされたものであり、有機繊維よりなるコードを配列したベルト層を１層以上積層してなるベルトとトレッドとを有する使用済みタイヤのトレッドの厚さを自動的に測定する方法およびそのための装置を提供することを目的とする。   The present invention has been made in view of such problems, and the thickness of the tread of a used tire having a belt and a tread formed by laminating one or more belt layers in which cords made of organic fibers are arranged is determined. It is an object of the present invention to provide a method for automatic measurement and an apparatus therefor.

＜１＞は、有機繊維よりなるコードを配列したベルト層を１層以上積層してなるベルトとトレッドとを有する使用済みタイヤのトレッドの厚さを測定したあとベルトが露出するまでトレッドをバフしてタイヤを更正するに際し、トレッドの厚さを測定する方法において、
テラヘルツ波をタイヤの軸方向に照射する照射装置をタイヤ半径方向に移動させながら、タイヤを透過する波の強度を、照射装置のタイヤ半径方向位置ごとに測定し、その測定結果からトレッドの厚さを特定するトレッド厚さ測定方法である。 <1> is to measure the thickness of the tread of a used tire having a belt and a tread formed by laminating one or more belt layers in which cords made of organic fibers are arranged, and then buff the tread until the belt is exposed. In the method of measuring the tread thickness when correcting the tire,
While moving the irradiation device that irradiates the terahertz wave in the tire axial direction in the tire radial direction, the intensity of the wave transmitted through the tire is measured for each position in the tire radial direction of the irradiation device, and the thickness of the tread is determined from the measurement result. Is a tread thickness measuring method for specifying

＜２＞は、＜１＞において、前記タイヤを航空機用タイヤとするトレッド厚さ測定方法である。   <2> is a tread thickness measurement method according to <1>, in which the tire is an aircraft tire.

＜３＞は、＜１＞もしくは＜２＞のいずれかのトレッド厚さ測定方法に用いられるトレッド厚さ測定装置であって、
テラヘルツ波を照射する照射装置と、タイヤを透過したテラヘルツ波を検出する検出装置と、前記照射装置および検出装置を前記タイヤに対して、タイヤの半径方向に沿って相対変位させる変位装置とを具えるトレッド厚さ測定装置である。 <3> is a tread thickness measuring device used in the tread thickness measuring method according to either <1> or <2>,
An irradiation device that irradiates terahertz waves, a detection device that detects terahertz waves transmitted through a tire, and a displacement device that relatively displaces the irradiation device and the detection device with respect to the tire along a radial direction of the tire. The tread thickness measuring device.

＜１＞によれば、テラヘルツ波をタイヤの軸方向に照射する照射装置をタイヤ半径方向に移動させながら、タイヤを透過する波の強度を、照射装置のタイヤ半径方向位置ごとに測定し、その測定結果からトレッドの厚さを特定するので、自動的にトレッドの厚さを測定することができる。   According to <1>, the intensity of the wave transmitted through the tire is measured for each position in the tire radial direction of the irradiation device while moving the irradiation device that irradiates the terahertz wave in the tire axial direction in the tire radial direction. Since the thickness of the tread is specified from the measurement result, the thickness of the tread can be automatically measured.

＜２＞によれば、前記タイヤを、現在特に生産性の向上が問題となっている航空機用タイヤとするので、前記効果を大きなものとすることができる。   According to <2>, since the tire is an aircraft tire in which improvement of productivity is currently a problem, the effect can be increased.

＜３＞によれば、テラヘルツ波を照射する照射装置と、タイヤを透過したテラヘルツ波を検出する検出装置と、前記照射装置および検出装置を前記タイヤに対して、タイヤの半径方向に沿って相対変位させる変位装置とを具えるので、前記トレッド厚さ測定方法を簡易に実現させることができる。   According to <3>, the irradiation device that irradiates the terahertz wave, the detection device that detects the terahertz wave transmitted through the tire, and the irradiation device and the detection device relative to the tire along the radial direction of the tire. Since the displacement device for displacement is provided, the tread thickness measurement method can be easily realized.

本発明に係る実施形態のトレッド厚さ測定装置を示す概略正面図である。It is a schematic front view which shows the tread thickness measuring apparatus of embodiment which concerns on this invention. トレッド厚さ測定装置を示す概略側面図である。It is a schematic side view which shows a tread thickness measuring apparatus. タイヤを透過するテラヘルツ波を示す概略図である。It is the schematic which shows the terahertz wave which permeate | transmits a tire. 検知したテラヘルツ波の時間変化を示すグラフである。It is a graph which shows the time change of the detected terahertz wave.

本発明の実施形態について図を参照して説明する。図１は、本発明の実施形態のトレッド厚さ測定装置を示す概略正面図であり、図２は、その概略側面図である。トレッド厚さ測定装置１０は、テラヘルツ波を照射する照射装置１と、照射装置１から照射されたタイヤ１１を透過したテラヘルツ波を検出する検出装置２と、照射装置１および検出装置２をタイヤ１１の半径方向に相対変位させる変位装置３を具えて構成される。ここで、変位装置３は、照射装置１および検出装置２をタイヤ１１に対して相対変位させればよく、図示の場合は、タイヤ１１の側を固定した状態にして照射装置１および検出装置２を変位させるものを例示したが、代わりに、照射装置１および検出装置２の側を固定してタイヤを変位させるものであってもよい。   Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view showing a tread thickness measuring apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic side view thereof. The tread thickness measuring device 10 includes an irradiation device 1 that irradiates terahertz waves, a detection device 2 that detects terahertz waves transmitted through the tire 11 irradiated from the irradiation device 1, and the irradiation device 1 and the detection device 2 that are connected to the tire 11. And a displacement device 3 for relative displacement in the radial direction. Here, the displacement device 3 only needs to relatively displace the irradiation device 1 and the detection device 2 with respect to the tire 11, and in the case of the drawing, the irradiation device 1 and the detection device 2 with the tire 11 side fixed. However, instead, the irradiation device 1 and the detection device 2 may be fixed to displace the tire.

また、トレッド厚さ測定装置１０は、タイヤ１１をその周方向に回転可能に支持するタイヤ回転支持台４と、タイヤを周方向に所定角度だけ回転させるタイヤ回転手段５とを具える。図示のタイヤ回転手段５は、タイヤの軸線を水平にした状態で、タイヤのビード部内周の上側を回転自在に支持する支持ローラ６により構成され、支持ローラ６を回転することによって、支持ローラ６の外径に対するタイヤの内径の比を減速比としてタイヤを回転させることができる。   The tread thickness measuring device 10 includes a tire rotation support base 4 that supports the tire 11 so as to be rotatable in the circumferential direction thereof, and a tire rotation means 5 that rotates the tire by a predetermined angle in the circumferential direction. The illustrated tire rotating means 5 includes a support roller 6 that rotatably supports the upper side of the inner periphery of the bead portion of the tire in a state where the axis of the tire is horizontal, and the support roller 6 is rotated by rotating the support roller 6. The tire can be rotated using the ratio of the inner diameter of the tire to the outer diameter of the tire as a reduction ratio.

図３は、トレッドを透過するテラヘルツ波を示す概念図であり、図４は、検出装置２が検出するテラヘルツ波の強度を縦軸に、時間を横軸にとって、検出されたテラヘルツ波の強度を模式的に示すグラフであり、図２、図３を参照して、この装置を用いてトレッドの厚さを測定する方法の原理について説明する。照射装置１は、テラヘルツ波をタイヤの軸方向に沿って照射するよう配置され、検出装置２は、照射装置１からタイヤを軸方向に横断して透過してきたテラヘルツ波を検出するよう配置され、変位装置３は、これらの装置１、２を作動させた状態で、タイヤ１１の半径方向外側から中心に向かって予め定められた速度ｖで変位させる。   FIG. 3 is a conceptual diagram showing a terahertz wave transmitted through the tread. FIG. 4 shows the intensity of the detected terahertz wave with the vertical axis representing the intensity of the terahertz wave detected by the detection device 2 and the horizontal axis representing time. FIG. 2 is a graph schematically showing the principle of a method for measuring the thickness of a tread using this apparatus with reference to FIGS. 2 and 3. FIG. The irradiation device 1 is arranged to irradiate terahertz waves along the axial direction of the tire, and the detection device 2 is arranged to detect terahertz waves transmitted from the irradiation device 1 across the tire in the axial direction, The displacement device 3 displaces the tire 11 at a predetermined speed v from the outer side in the radial direction toward the center while the devices 1 and 2 are operated.

装置１、２がタイヤの半径方向外側の位置（図３のＡの位置）にいる時刻からタイヤの外径に対応する位置（図３のＢの位置）に到達する時刻t1までは、テラヘルツ波は空気中を通過するだけなので、強度の減衰はほとんどないが、装置１、２がタイヤの外径に対応する位置を過ぎると、テラヘルツ波はタイヤのトレッド８のゴムによって減衰し、装置１、２がベルト９の位置（図３のＣの位置）に到達する時刻t2までは、一定の強度E0で推移する。装置１、２がベルト９の位置を過ぎると減衰がさらに大きくなって、検出装置２が検出する強度はさらに低下する。 Device 1 is positioned radially outward of the tire up to the time t 1 to reach the position corresponding to the outer diameter from the time you are in the tire (position A in FIG. 3) (position B in FIG. 3) is, terahertz Since the wave only passes through the air, there is almost no attenuation of the intensity. However, when the devices 1 and 2 pass the position corresponding to the outer diameter of the tire, the terahertz wave is attenuated by the rubber of the tread 8 of the tire, and the device 1 Until the time t 2 when 2 reaches the position of the belt 9 (the position of C in FIG. 3), it changes at a constant intensity E 0 . When the devices 1 and 2 pass the position of the belt 9, the attenuation is further increased, and the intensity detected by the detection device 2 is further reduced.

以上説明したように、トレッドの厚さ分に対応する位置に装置１、２が位置していたのは、時刻t1からt2までの間であるから、この間の時間T（=t2-t1）に既知の移動速度ｖを掛け合わせることによってトレッドの厚さを知ることができる。 As described above, the devices 1 and 2 are located at the position corresponding to the thickness of the tread from the time t 1 to the time t 2 , so the time T (= t 2 − The thickness of the tread can be determined by multiplying t 1 ) by a known moving speed v.

そして、時刻t1、t2を検知するには、トレッド部分に対応する検知強度E0、予め定められた閾値をΔE1、ΔE2として、E0+ΔE1に到達した時刻をt1とし、E0−ΔE2に到達した時刻をt２とすればよい。 In order to detect the times t 1 and t 2 , the detection intensity E 0 corresponding to the tread portion, ΔE 1 and ΔE 2 as predetermined thresholds, and the time when E 0 + ΔE 1 is reached is set to t 1. the time reaching the E 0 -ΔE 2 may be set to t2.

以上説明した測定原理に従って、トレッド厚さ測定装置１０を用いてトレッドの厚さを測定する方法について説明する。まず、タイヤをタイヤ回転台４にセットする。そして、タイヤ１１をこの状態に固定して照射装置１および検出装置２をタイヤの半径方向外側の位置から中心に向かって移動させ、図２に示したようなデータを収集し、先に述べた原理によって、このタイヤの姿勢におけるトレッドの厚さを特定する。   A method for measuring the thickness of the tread using the tread thickness measuring apparatus 10 according to the measurement principle described above will be described. First, the tire is set on the tire turntable 4. Then, the tire 11 is fixed in this state, and the irradiation device 1 and the detection device 2 are moved from the radially outer position of the tire toward the center to collect data as shown in FIG. The thickness of the tread in this tire posture is specified by the principle.

次いで、タイヤを予め定められた角度だけ回転させ、例えば、タイヤの周方向に３カ所に振り分けた角度位置におけるトレッドの厚さを検知する場合には、120°回転させて、同様の操作を行うことにより、新しい周方向位置でのトレッド厚さを知ることができる。このようにして、タイヤ周方向に並んだ代表位置におけるトレッド厚さを測定することができ、しかも、代表位置を周方向に密に配列することによってより正確なトレッド厚さの周方向分布を知ることができ、この分布データに基づいて、周方向位置に応じてバフ深さを変えることにより、周方向に均一なバフ後表面を得ることが可能となる。   Next, the tire is rotated by a predetermined angle. For example, when detecting the thickness of the tread at three angular positions distributed in the circumferential direction of the tire, the tire is rotated by 120 ° and the same operation is performed. Thus, the tread thickness at the new circumferential position can be known. In this way, the tread thickness at the representative positions aligned in the tire circumferential direction can be measured, and more accurate circumferential distribution of the tread thickness can be obtained by densely arranging the representative positions in the circumferential direction. It is possible to obtain a uniform post-buffing surface in the circumferential direction by changing the buff depth according to the circumferential position based on this distribution data.

１ 照射装置
２ 検知装置
３ 変位装置
４ タイヤ回転台
５ タイヤ回転手段
８ トレッド
９ ベルト
１０ トレッド厚さ測定装置
１１ タイヤ DESCRIPTION OF SYMBOLS 1 Irradiation device 2 Detection device 3 Displacement device 4 Tire turntable 5 Tire rotation means 8 Tread 9 Belt 10 Tread thickness measurement device 11 Tire

Claims (3)

有機繊維よりなるコードを配列したベルト層を１層以上積層してなるベルトとトレッドとを有する使用済みタイヤのトレッドの厚さを測定したあとベルトが露出するまでトレッドをバフしてタイヤを更正するに際し、トレッドの厚さを測定する方法において、
テラヘルツ波をタイヤの軸方向に照射する照射装置をタイヤ半径方向に移動させながら、タイヤを透過する波の強度を、照射装置のタイヤ半径方向位置ごとに測定し、その測定結果からトレッドの厚さを特定するトレッド厚さ測定方法。 After measuring the thickness of the tread of a used tire having a belt and a tread formed by laminating one or more belt layers in which cords made of organic fibers are arranged, the tread is buffed until the belt is exposed and the tire is corrected. In the method of measuring the thickness of the tread,
While moving the irradiation device that irradiates the terahertz wave in the tire axial direction in the tire radial direction, the intensity of the wave transmitted through the tire is measured for each position in the tire radial direction of the irradiation device, and the thickness of the tread is determined from the measurement result. Tread thickness measurement method to identify. 前記タイヤを航空機用タイヤとする請求項１に記載のトレッド厚さ測定方法。   The tread thickness measurement method according to claim 1, wherein the tire is an aircraft tire. 請求項１又は２に記載のトレッド厚さ測定方法に用いられるトレッド厚さ測定装置であって、
テラヘルツ波を照射する照射装置と、タイヤを透過したテラヘルツ波を検出する検出装置と、前記照射装置および検出装置を前記タイヤに対して、タイヤの半径方向に沿って相対変位させる変位装置とを具えるトレッド厚さ測定装置。 A tread thickness measuring device used in the tread thickness measuring method according to claim 1 or 2,
An irradiation device that irradiates terahertz waves, a detection device that detects terahertz waves transmitted through a tire, and a displacement device that relatively displaces the irradiation device and the detection device with respect to the tire along a radial direction of the tire. Tread thickness measuring device.
JP2009114690A 2009-05-11 2009-05-11 Tread thickness measuring method and device therefor Withdrawn JP2010261902A (en)

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EP2752287A1 (en) 2013-01-02 2014-07-09 Proton Products International Limited Apparatus for measuring industrial products manufactured by extrusion techniques
JP2016041577A (en) * 2014-08-13 2016-03-31 ステインビッヒラー オプトテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング Inspection method and device for tire
US9733193B2 (en) 2015-03-12 2017-08-15 Proton Products International Limited Measurement of industrial products manufactured by extrusion techniques
CN110214265A (en) * 2017-01-27 2019-09-06 株式会社普利司通 Tire grounding characteristics evaluation method
US11874223B1 (en) 2022-08-30 2024-01-16 The Goodyear Tire & Rubber Company Terahertz characterization of a multi-layered tire tread

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EP2752287A1 (en) 2013-01-02 2014-07-09 Proton Products International Limited Apparatus for measuring industrial products manufactured by extrusion techniques
US9146092B2 (en) 2013-01-02 2015-09-29 Proton Products International Limited Measurement of industrial products manufactured by extrusion techniques
JP2016041577A (en) * 2014-08-13 2016-03-31 ステインビッヒラー オプトテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング Inspection method and device for tire
US9733193B2 (en) 2015-03-12 2017-08-15 Proton Products International Limited Measurement of industrial products manufactured by extrusion techniques
CN110214265A (en) * 2017-01-27 2019-09-06 株式会社普利司通 Tire grounding characteristics evaluation method
EP3575769A4 (en) * 2017-01-27 2020-10-28 Bridgestone Corporation Method of evaluating tire ground contact characteristic
US10989629B2 (en) 2017-01-27 2021-04-27 Bridgestone Corporation Method of evaluating tire ground contact property
CN110214265B (en) * 2017-01-27 2021-06-11 株式会社普利司通 Tire grounding characteristic evaluation method
US11874223B1 (en) 2022-08-30 2024-01-16 The Goodyear Tire & Rubber Company Terahertz characterization of a multi-layered tire tread

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