JP2019113406A - Evaluation method of uneven wear resistance of rubber member and tire manufacturing method using the same - Google Patents

Evaluation method of uneven wear resistance of rubber member and tire manufacturing method using the same Download PDF

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JP2019113406A
JP2019113406A JP2017246673A JP2017246673A JP2019113406A JP 2019113406 A JP2019113406 A JP 2019113406A JP 2017246673 A JP2017246673 A JP 2017246673A JP 2017246673 A JP2017246673 A JP 2017246673A JP 2019113406 A JP2019113406 A JP 2019113406A
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rubber
rubber sample
wear
evaluation method
wear resistance
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JP6922722B2 (en
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中野 真也
Shinya Nakano
真也 中野
多田 俊生
Toshio Tada
俊生 多田
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Sumitomo Rubber Industries Ltd
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Abstract

To evaluate uneven wear resistance of a rubber member.SOLUTION: A method for evaluating uneven wear resistance of a rubber member includes: a step K1 of preparing a plurality of types of rubber samples G which have the same combination and different rigidity; a step K2 of conducting a wear test on the rubber samples under the same test conditions by using a wear tester; a step K3 of measuring the amount of wear of the rubber samples; and a step K4 of determining the quality of the uneven wear resistance of the rubber member on the basis of a parameter related to difference in the amount of wear.SELECTED DRAWING: Figure 1

Description

本発明は、ゴム部材の耐偏摩耗性能を評価するための方法及びこれを用いたタイヤ製造方法に関する。   The present invention relates to a method for evaluating the uneven wear resistance of a rubber member and a tire manufacturing method using the same.

従来、ゴム部材の摩耗性能を評価するための方法が種々提案されている。例えば、下記特許文献1には、タイヤのトレッド部からゴムサンプルを切り出す工程と、前記ゴムサンプルを室内摩耗試験機によって摩耗させる工程と、前記ゴムサンプルの摩耗状態に基づいて耐摩耗性能を評価する工程とを含む方法が記載されている。   Heretofore, various methods for evaluating the wear performance of a rubber member have been proposed. For example, in Patent Document 1 below, a process of cutting a rubber sample from a tread portion of a tire, a process of abrading the rubber sample with an indoor abrasion tester, and evaluation of wear resistance performance based on a wear state of the rubber sample And a method comprising the steps is described.

特許第5542104号公報Patent No. 5542104 gazette

例えば、タイヤのトレッド部のゴムブロックなどをはじめとして、同一のゴム配合であっても形状や大きさなどにより剛性が異なる場合、異なる摩耗特性を示すことがある。例えば、同一のゴム配合の2種のゴム部材について、剛性が大きいものでは、良好な摩耗特性を示すが、剛性が小さくなると、著しく早期に摩耗する特性を示す場合がある。このような特性は、例えば、様々な剛性のブロックが形成されたタイヤトレッドや各種ローラ等において、偏摩耗として現れる。然るに、上述の評価方法は、そのような偏摩耗性能を評価できるものではなかった。   For example, even if the rubber composition of the tread portion of the tire and the like is the same, even if the rubber composition is different depending on the shape, size, etc., the rigidity may show different wear characteristics. For example, with respect to two types of rubber members having the same rubber composition, those having high rigidity may exhibit good wear characteristics, but may show characteristics of early wear when the rigidity is low. Such characteristics appear as uneven wear, for example, in a tire tread, various rollers and the like in which blocks of various rigidity are formed. Therefore, the above-mentioned evaluation method could not evaluate such uneven wear performance.

本発明は、以上のような問題点に鑑み案出なされたもので、ゴム部材の耐偏摩耗性能を評価する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 made in view of the above problems, and its main object is to provide a method for evaluating the uneven wear resistance of a rubber member.

本願第1の発明は、ゴム部材の耐偏摩耗性能を評価する方法であって、同一の配合かつ剛性の異なる少なくとも第1ゴムサンプル及び第2ゴムサンプルを含む複数種類のゴムサンプルを準備する工程と、前記第1ゴムサンプル及び前記第2ゴムサンプルを、摩耗試験機を用いて、同一試験条件で摩耗試験を行う工程と、前記摩耗試験の後、前記第1ゴムサンプルと前記第2ゴムサンプルとの摩耗量を測定する工程と、前記第1ゴムサンプルの前記摩耗量と前記第2ゴムサンプルの前記摩耗量との差に関連するパラメータに基づいて、前記ゴム部材の耐偏摩耗性能の良否を判定する工程とを含む。   The first invention of the present application is a method for evaluating the uneven wear resistance performance of a rubber member, and a step of preparing a plurality of rubber samples including at least a first rubber sample and a second rubber sample having the same composition and different rigidity. A step of performing an abrasion test on the first rubber sample and the second rubber sample under the same test conditions using an abrasion tester, and after the abrasion test, the first rubber sample and the second rubber sample Of the uneven wear resistance of the rubber member based on a parameter related to the difference between the amount of wear of the first rubber sample and the amount of wear of the second rubber sample; And the step of

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記ゴムサンプルが、タイヤから採取されたものであるのが望ましい。   In the method for evaluating the uneven wear resistance of a rubber member according to the present invention, it is desirable that the rubber sample be collected from a tire.

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記ゴムサンプルが、タイヤのトレッド部から採取されたものであるのが望ましい。   In the method for evaluating the uneven wear resistance of a rubber member according to the present invention, it is desirable that the rubber sample be collected from a tread portion of a tire.

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記第1ゴムサンプル及び前記第2ゴムサンプルが、同一長さかつ異なる幅を有するシート状であるのが望ましい。   In the method for evaluating the uneven wear resistance of a rubber member according to the present invention, it is desirable that the first rubber sample and the second rubber sample be in the form of a sheet having the same length and different widths.

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記摩耗試験機が、室内摩耗試験機であるのが望ましい。   In the method for evaluating the uneven wear resistance of a rubber member according to the present invention, it is desirable that the wear tester be an indoor wear tester.

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記パラメータが、前記第1ゴムサンプルの前記摩耗量と前記第2ゴムサンプルの前記摩耗量との比を含むのが望ましい。   In the method of evaluating uneven wear resistance of a rubber member according to the present invention, it is preferable that the parameter includes a ratio between the amount of wear of the first rubber sample and the amount of wear of the second rubber sample.

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記判定する工程が、前記比が1に近いほど耐偏摩耗性を良と判定するのが望ましい。   In the method of evaluating the uneven wear resistance of a rubber member according to the present invention, it is desirable that the step of determining determines that the uneven wear resistance is good as the ratio is closer to 1.

本発明に係るゴム部材の耐偏摩耗性能の評価方法は、前記判定する工程が、前記比が1±0.2の範囲で耐偏摩耗性を良と判定するのが望ましい。   In the method for evaluating the uneven wear resistance of a rubber member according to the present invention, it is desirable that the determining step determines that the uneven wear resistance is good when the ratio is in the range of 1 ± 0.2.

本願第2の発明はタイヤ製造方法であって、前記第1の発明の評価方法によって良と判定されたゴム部材と同じ配合でタイヤの構成部材を作製する工程を含む。   A second invention of the present application is a tire manufacturing method, and includes a step of manufacturing a tire component with the same composition as the rubber member determined to be good by the evaluation method of the first invention.

本発明に係るタイヤ製造方法は、前記構成部材が、トレッド部に配されるのが望ましい。   In the tire manufacturing method according to the present invention, it is desirable that the component is disposed in the tread portion.

本発明のゴム部材の耐偏摩耗性能の評価方法では、第1ゴムサンプルの摩耗量と、前記第1ゴムサンプルと同一の配合かつ剛性の異なる第2ゴムサンプルの摩耗量との差に関連するパラメータに基づいて、ゴム部材の耐偏摩耗性能の良否を判定する工程を含む。このように本発明の評価方法では、同一の配合であっても、剛性が変わることで摩耗特性が大きく変化する等の特性、即ち耐偏摩耗性能を評価することができる。   In the evaluation method of the uneven wear resistance performance of the rubber member of the present invention, it relates to the difference between the amount of wear of the first rubber sample and the amount of wear of the second rubber sample having the same composition and different rigidity as the first rubber sample. The process of determining the quality of the uneven wear resistance performance of a rubber member based on a parameter is included. As described above, according to the evaluation method of the present invention, even if the composition is the same, it is possible to evaluate the characteristic that the wear characteristics change largely due to the change of the rigidity, that is, the uneven wear resistance performance.

本発明の評価方法の処理手順を示すフローチャートである。It is a flowchart which shows the process sequence of the evaluation method of this invention. 準備する工程を説明する概略図である。It is the schematic explaining the process to prepare. 本発明で使用される摩耗試験機の一例を示す斜視図である。It is a perspective view which shows an example of the abrasion tester used by this invention. 図3の摩耗試験機の部分拡大図である。It is the elements on larger scale of the abrasion tester of FIG. ローラ体を説明する拡大斜視図である。It is an expansion perspective view explaining a roller body.

以下、本発明の実施の一形態が図面に基づき説明される。
本実施形態のゴム部材の耐偏摩耗性能を評価する方法(以下、単に「評価方法」という場合がある。)は、例えば、搬送用の各種ローラやベルトなどを含み、偏摩耗が生じる可能性のある、あらゆるゴム部材の耐偏摩耗性能を評価することができる。本実施形態の評価方法は、とりわけ、タイヤT(図2に示す)のトレッド部TaのトレッドゴムTgの耐偏摩耗性能を評価することに適している。以下、本明細書では、ゴム部材Gaとして、トレッドゴムTgが用いられる場合の評価方法が説明される。
Hereinafter, an embodiment of the present invention will be described based on the drawings.
The method for evaluating the uneven wear resistance of the rubber member of the present embodiment (hereinafter sometimes referred to simply as the “evaluation method”) includes, for example, various rollers for conveyance, a belt, etc. It is possible to evaluate the uneven wear resistance of any rubber member. The evaluation method of the present embodiment is particularly suitable for evaluating the uneven wear resistance performance of the tread rubber Tg of the tread portion Ta of the tire T (shown in FIG. 2). Hereinafter, in the present specification, an evaluation method in the case where the tread rubber Tg is used as the rubber member Ga will be described.

図1は、本実施形態の評価方法の処理手順を示すフローチャートである。図1に示されるように、評価方法は、本実施形態では、ゴムサンプルG(図2に示す)を準備する工程K1と、ゴムサンプルGの摩耗試験を行う工程K2と、ゴムサンプルGの摩耗量を測定する工程K3と、耐偏摩耗性能の良否を判定する工程K4とを含んでいる。   FIG. 1 is a flowchart showing the processing procedure of the evaluation method of the present embodiment. As shown in FIG. 1, in the present embodiment, the evaluation method includes a step K1 of preparing a rubber sample G (shown in FIG. 2), a step K2 of performing an abrasion test of the rubber sample G, and an abrasion of the rubber sample G. It includes a step K3 of measuring the amount and a step K4 of judging the quality of the uneven wear resistance performance.

図2は、準備する工程K1を説明する概略図である。図2に示されるように、ゴムサンプルGは、例えば、剛性の異なる少なくとも第1ゴムサンプルG1、第2ゴムサンプルG2を含む複数種類が準備される。図2に示されるように、本実施形態では、2種類のゴムサンプルGが準備される。しかしながら、本実施形態の評価方法では、剛性の異なる多くの種類のゴムサンプルGが準備されても良い。   FIG. 2 is a schematic view illustrating the preparing step K1. As shown in FIG. 2, a plurality of types of rubber samples G are prepared, including, for example, at least a first rubber sample G1 and a second rubber sample G2 having different stiffnesses. As shown in FIG. 2, in the present embodiment, two types of rubber samples G are prepared. However, in the evaluation method of the present embodiment, many types of rubber samples G having different rigidity may be prepared.

本実施形態の準備する工程K1では、ゴムサンプルGは、タイヤTから採取される。ゴムサンプルGは、本実施形態では、タイヤTの踏面T1を含むトレッド部Taから採取されるトレッドゴムTgである。本実施形態のトレッドゴムTgは、同一の配合で形成されているので、第1ゴムサンプルG1及び第2ゴムサンプルG2は、同一のゴム配合である。   In the preparation step K1 of the present embodiment, the rubber sample G is taken from the tire T. The rubber sample G is a tread rubber Tg collected from the tread portion Ta including the tread surface T1 of the tire T in the present embodiment. Since the tread rubber Tg of this embodiment is formed by the same composition, the first rubber sample G1 and the second rubber sample G2 have the same rubber composition.

タイヤTは、例えば、乗用車用、重荷重用または自動二輪車用などの空気入りタイヤ、及び、空気が充填されない非空気式タイヤを含み、種々のものが好適に採用される。   The tire T includes, for example, a pneumatic tire for a passenger car, a heavy load vehicle, a motorcycle, and the like, and a non-pneumatic tire not filled with air, and various types of tires are suitably employed.

トレッド部Taの踏面T1は、例えば、複数本の主溝や横溝等の溝状体(図示省略)が形成されており、主溝間及び主溝とトレッド端との間に複数の陸部が形成されている。各陸部は、例えば、その剛性がそれぞれ異なって形成される。なお、トレッド部Taは、例えば、複数本の主溝だけが形成される態様でも良いし、溝状体が形成されない態様でも良い。   Grooved bodies (not shown) such as a plurality of main grooves and lateral grooves are formed on the tread surface T1 of the tread portion Ta, and a plurality of land portions are provided between the main grooves and between the main grooves and the tread end. It is formed. Each land portion is, for example, formed to have different rigidity. The tread portion Ta may be, for example, an aspect in which only a plurality of main grooves are formed, or an aspect in which a groove-like body is not formed.

ゴムサンプルGは、例えば、機械加工、または、ナイフなどの切断具を用いて、トレッド部Taから切り出される。ゴムサンプルGの準備は、このような態様に限定されるものではない。   The rubber sample G is cut out of the tread portion Ta using, for example, machining or a cutting tool such as a knife. Preparation of rubber sample G is not limited to such an aspect.

第1ゴムサンプルG1及び第2ゴムサンプルG2は、本実施形態では、その幅Wを異ならせることにより、剛性が異なっている。本実施形態では、第1ゴムサンプルG1の幅Wa(図5に示す)が、第2ゴムサンプルG2の幅Wbよりも小さく形成されている。しかしながら、第1ゴムサンプルG1の幅Waが、第2ゴムサンプルG2の幅Wbよりも大きく形成されても良いのは、勿論である。なお、剛性を異ならせる態様としては、本実施形態の態様に限定されるものではなく、例えば、ゴムサンプルGの厚さt1を異ならせても良く、また、ゴムサンプルGに異なる溝状体を形成することでも良い。また、複数種類のゴムサンプルGが準備される場合、ゴムサンプルG毎に剛性、即ち、幅Wが異なっているのが望ましい。本明細書では、「剛性」とは、摩擦力等による摩耗に耐える能力のことである。   In the present embodiment, the first rubber sample G1 and the second rubber sample G2 have different stiffnesses by making their widths W different. In the present embodiment, the width Wa (shown in FIG. 5) of the first rubber sample G1 is formed smaller than the width Wb of the second rubber sample G2. However, of course, the width Wa of the first rubber sample G1 may be formed larger than the width Wb of the second rubber sample G2. In addition, as an aspect which makes rigidity different, it is not limited to the aspect of this embodiment, For example, you may differ thickness t1 of rubber sample G, Moreover, the different groove-like body to rubber sample G is used. It may be formed. In addition, when plural types of rubber samples G are prepared, it is desirable that the rigidity, that is, the width W be different for each rubber sample G. As used herein, "rigid" refers to the ability to withstand wear due to frictional forces and the like.

次に、摩耗試験を行う工程K2が行われる。本実施形態の摩耗試験を行う工程K2では、周知の摩耗試験機Mが用いられる。摩耗試験機Mは、例えば、JIS K6263に規格化されている加硫ゴムの摩耗試験などを行うことが可能なものであれば種々のものを採用できる。摩耗試験機Mは、室内で使用することができる室内摩耗試験機であるのが望ましい。これにより、例えば、室内の温湿度を一定とすることで、精度良く耐偏摩耗性能を評価することができる。本実施形態では、株式会社平泉洋行製のゴム摩耗試験機(型式:LAT100)に準じたものが採用される。   Next, step K2 of performing a wear test is performed. A well-known abrasion tester M is used in step K2 in which the abrasion test of the present embodiment is performed. As the wear tester M, for example, various machines can be adopted as long as they can perform a wear test of a vulcanized rubber standardized to JIS K6263. The wear tester M is preferably an indoor wear tester that can be used indoors. Thereby, for example, by making the temperature and humidity in the room constant, it is possible to evaluate the uneven wear resistance performance with high accuracy. In the present embodiment, one according to a rubber wear tester (model: LAT 100) manufactured by Hiraizumi Yoko Ltd. is employed.

図3及び図4に示されるように、摩耗試験機Mは、例えば、直方体状に形成され、前面のパネルpには、例えば、摩耗試験機Mを運転停止させるスイッチ類swや、試験状況を表示する表示部mなどが設けられている。   As shown in FIGS. 3 and 4, the wear tester M is formed, for example, in the shape of a rectangular parallelepiped, and on the front panel p, for example, switches sw for stopping the wear tester M, test conditions, A display unit m to be displayed is provided.

本実施形態の摩耗試験機Mは、垂直面内を該垂直面と直交する軸ch1周りに回転する砥石面4と、垂直面と平行な軸7で可回転に支持されたローラ体5とを含んで構成されている。これらの各種部材は、垂直なベースBの前面に配される。なお、砥石面4が回転する平面は、垂直面とされているが、水平面とされても良いのはいうまでもない。   The abrasion tester M of the present embodiment includes a grinding wheel surface 4 rotating in a vertical plane about an axis ch1 orthogonal to the vertical plane, and a roller body 5 rotatably supported by an axis 7 parallel to the vertical plane. It is comprised including. These various members are disposed on the front of the vertical base B. The plane on which the grindstone surface 4 rotates is a vertical plane, but it goes without saying that it may be a horizontal plane.

砥石面4は、例えば、軸ch1に固着された円盤状の回転テーブル8上に一定の幅を有する円環状で形成される。   The grindstone surface 4 is formed, for example, in an annular shape having a certain width on a disc-shaped rotary table 8 fixed to the shaft ch1.

軸ch1には、例えば、ベースBの背面側に配された電動機(図示せず)が接続される。この電動機の駆動により、回転テーブル8及び砥石面4が、軸ch1周りに回転する。   For example, a motor (not shown) disposed on the back side of the base B is connected to the axis ch1. By the drive of the motor, the rotary table 8 and the grindstone surface 4 rotate around the axis ch1.

屋外で実車を走行させて(以下、単に「実車走行」という場合がある。)タイヤTの耐偏摩耗性能を試験したときの試験結果と、本実施形態の摩耗試験機Mを用いて試験したときの試験結果との相関性を高く確保することが望まれる。このために、砥石面4の粒度は、例えば40〜240メッシュ程度が望ましい。   It was tested using a wear test machine M of this embodiment and a test result when a tire T was tested for its partial wear resistance performance by running an actual car outdoors (hereinafter sometimes referred to simply as "real car running") It is desirable to ensure high correlation with the test results from time to time. For this purpose, the particle size of the grinding wheel surface 4 is preferably, for example, about 40 to 240 mesh.

図5に示されるように、ローラ体5は、その中心に貫通孔5bを有する円筒状をなしている。貫通孔5bには、軸7(図4に示す)の一端7i側が、例えば、ベアリングを介して固着される。これにより、ローラ体5は、軸7周りに回転可能となる。   As shown in FIG. 5, the roller body 5 has a cylindrical shape having a through hole 5b at its center. One end 7i side of the shaft 7 (shown in FIG. 4) is fixed to the through hole 5b via, for example, a bearing. Thus, the roller body 5 can rotate around the shaft 7.

ローラ体5は、例えば、その外周面5aにゴムサンプルGが固着される。本実施形態では、ローラ体5を、回転する砥石面4に接触して押圧することで、ゴムサンプルGが連続して摩耗される。   For example, the rubber sample G is fixed to the outer peripheral surface 5 a of the roller body 5. In the present embodiment, the rubber sample G is continuously worn by pressing the roller body 5 in contact with the rotating grindstone surface 4.

上述とおり、両試験結果の相関性を高く確保するために、ゴムサンプルGを含むローラ体5の砥石面4への押圧による荷重Fは、例えば、20〜100Nが望ましい。   As described above, in order to ensure a high correlation between the two test results, it is desirable that the load F caused by the pressure applied to the grinding surface 4 of the roller body 5 including the rubber sample G be, for example, 20 to 100N.

ローラ体5は、例えば、ゴムサンプルGとの強固な接着を確保すために、ゴム材料で形成されるのが望ましい。また、ローラ体5の大きさは、特に限定されるものではないが、例えば、外径d1が70〜80mm、幅W1が15〜22mmである。   The roller body 5 is desirably formed of a rubber material, for example, in order to ensure strong adhesion with the rubber sample G. The size of the roller body 5 is not particularly limited, and for example, the outer diameter d1 is 70 to 80 mm, and the width W1 is 15 to 22 mm.

ゴムサンプルGの形状は、例えば矩形等のシート状が好適である。ゴムサンプルGは、例えば、その厚さt1が0.5〜4.0mmのものが望ましい。厚さt1が小さくなると、ゴムサンプルGの摩耗可能な量が小さくなり、精度良く摩耗試験できなくなるおそれがある。逆に、厚さt1が大きくなると、ゴムサンプルGの曲げが困難になり、ローラ体5の外周面5aに巻付けられないおそれがある。   The shape of the rubber sample G is preferably, for example, a sheet shape such as a rectangular shape. The rubber sample G preferably has a thickness t1 of 0.5 to 4.0 mm, for example. If the thickness t1 decreases, the abradable amount of the rubber sample G decreases, which may make it impossible to perform the abrasion test with high accuracy. Conversely, when the thickness t1 is increased, bending of the rubber sample G becomes difficult, and there is a possibility that the rubber sample G can not be wound around the outer peripheral surface 5a of the roller body 5.

ゴムサンプルGの幅Wは、摩耗量を精度良く測定するために、例えば、4mm以上が望ましい。ゴムサンプルGの幅Wがローラ体5の幅W1よりも大きい場合、ゴムサンプルGに応力集中が作用し、精度良く摩耗できないおそれがある。このため、ゴムサンプルGの幅Wの上限値は、ローラ体5の幅W1と同じであるのが望ましい。各ゴムサンプルGの長さは、同一であるのが望ましい。   The width W of the rubber sample G is desirably, for example, 4 mm or more in order to measure the amount of wear with high accuracy. When the width W of the rubber sample G is larger than the width W1 of the roller body 5, stress concentration acts on the rubber sample G, and there is a possibility that the rubber sample G can not be worn accurately. For this reason, it is desirable that the upper limit value of the width W of the rubber sample G be the same as the width W1 of the roller body 5. It is desirable that the length of each rubber sample G be the same.

図3に示されるように、本実施形態の摩耗試験機Mは、ローラ体5を移動させるローラ体移動具9が設けられる。ローラ体移動具9は、例えば、ローラ体5を砥石面4に対し垂直移動させる周知構造のシリンダ機構10と、ローラ体5を砥石面4に対し平行に移動させる周知構造の回転機構11と、ローラ体5の移動スムーズにさせる周知構造の補強部材13とを含んでいる。   As shown in FIG. 3, the abrasion tester M of the present embodiment is provided with a roller body moving tool 9 for moving the roller body 5. The roller body moving tool 9 has, for example, a cylinder mechanism 10 having a known structure for moving the roller body 5 vertically with respect to the grinding surface 4 and a rotating mechanism 11 having a known structure for moving the roller body 5 parallel to the grinding surface 4; And a reinforcing member 13 of a known structure for facilitating the movement of the roller body 5.

回転機構11は、例えば、ローラ体5の円周の接線方向と、砥石面4の円周の接線方向とを異ならせることができ、ローラ体5にスリップ角αを付与し得るものが望ましい。ローラ体5にスリップ角αが付与されると、砥石面4とゴムサンプルGとの摩擦力が大きくなり、ゴムサンプルGを短時間で効率よく摩耗させることができる。   The rotation mechanism 11 is preferably, for example, capable of making the tangential direction of the circumference of the roller body 5 different from the tangential direction of the circumference of the grindstone surface 4 and giving the slip angle α to the roller body 5. When the slip angle α is given to the roller body 5, the frictional force between the grindstone surface 4 and the rubber sample G becomes large, and the rubber sample G can be efficiently worn in a short time.

スリップ角αについては、特に限定されるものではないが、例えば、実車走行による耐偏摩耗性能の試験結果と、本実施形態による試験結果との相関性を高く確保するために、3〜15度が望ましい。   The slip angle α is not particularly limited. For example, the slip angle α is 3 to 15 degrees in order to ensure a high correlation between the test result of the uneven wear resistance performance during actual running and the test result according to the present embodiment. Is desirable.

なお、摩耗試験機Mは、砥石面4の温度を変化させる周知構造の温度制御装置(図示省略)を含んでも良い。これにより、さらに、ゴム部材Gaの評価精度が高められる。   The wear tester M may include a temperature control device (not shown) of a known structure that changes the temperature of the grinding surface 4. This further enhances the evaluation accuracy of the rubber member Ga.

また、摩耗試験機Mは、ゴムサンプルGと砥石面4との間に砂状体を噴射する周知構造の噴射装置(図示省略)が設けられても良い。このような噴射装置は、砥石面4とゴムサンプルGとの摩耗によって排出される削りかすがゴムサンプルGに再付着するのを抑制するのに役立つ。これにより、ゴムサンプルGの摩耗後の質量を精度良く測定することができるので、例えば、摩耗前後の質量差により摩耗量(質量)を正確に測定できる。   Further, the wear tester M may be provided with an injector (not shown) of a known structure for injecting a sand-like material between the rubber sample G and the grindstone surface 4. Such an injection device serves to suppress re-adhesion of scraps discharged due to the wear between the grinding surface 4 and the rubber sample G from adhering to the rubber sample G. Thereby, since the mass after abrasion of rubber sample G can be measured with sufficient accuracy, for example, the amount of abrasion (mass) can be measured correctly by the mass difference before and behind abrasion.

摩耗試験を行う工程K2では、第1ゴムサンプルG1及び第2ゴムサンプルG2が、摩耗試験機Mを用いて、同一試験条件で摩耗試験される。同一試験条件とは、例えば、スリップ角α、ローラ体5の砥石面4への押圧の荷重F、砥石面4の回転速度、室内の温湿度を含む条件を同一とすることである。本実施形態の同一試験条件には、第1ゴムサンプルG1の幅Wa及び第2ゴムサンプルG2の幅Wbを同一とすることは、含まれない。なお、複数のゴムサンプルGを用いて摩耗試験を行う場合も同様である。   In the step K2 of performing the abrasion test, the first rubber sample G1 and the second rubber sample G2 are abrasion-tested under the same test conditions using an abrasion tester M. The same test conditions include, for example, the same conditions including the slip angle α, the load F of the pressure applied to the wheel surface 4 of the roller body 5, the rotational speed of the wheel surface 4, and the temperature and humidity of the room. The same test conditions in this embodiment do not include making the width Wa of the first rubber sample G1 and the width Wb of the second rubber sample G2 the same. The same applies to the case where a wear test is performed using a plurality of rubber samples G.

次に、摩耗量を測定する工程K3が行われる。本実施形態の摩耗量を測定する工程K3は、第1ゴムサンプルG1の摩耗量f1と第2ゴムサンプルG2との摩耗量f2とが測定される。各摩耗量は、例えば、周知構造の質量計、例えば、天秤ばかりでその質量が正確に測定される。   Next, step K3 of measuring the amount of wear is performed. In step K3 of measuring the amount of wear of the present embodiment, the amount of wear f1 of the first rubber sample G1 and the amount of wear f2 of the second rubber sample G2 are measured. Each amount of wear can be accurately measured by, for example, a well-known mass spectrometer, such as a balance.

次に、判定する工程K4が行われる。本実施形態の判定する工程K4では、第1ゴムサンプルG1の摩耗量f1と第2ゴムサンプルG2の摩耗量f2との差に関連するパラメータPに基づいて、ゴム部材Gaの耐偏摩耗性能の良否が判定される。このように本実施形態の評価方法では、各工程K1〜K4を含むことで、同一の配合であっても、剛性が変わることで摩耗特性が大きく変化する等の特性、即ち耐偏摩耗性能を評価することができる。   Next, determination step K4 is performed. In the step K4 of the present embodiment, the uneven wear resistance of the rubber member Ga is determined based on the parameter P related to the difference between the wear amount f1 of the first rubber sample G1 and the wear amount f2 of the second rubber sample G2. Good or bad is judged. As described above, in the evaluation method of the present embodiment, even if the same combination is included by including the respective steps K1 to K4, the characteristics such as the wear characteristics largely change due to the change in rigidity, ie, the uneven wear resistance It can be evaluated.

発明者らは、このような判定する工程K4において、種々の実験により、本実施形態の摩耗試験機Mによる耐偏摩耗性能と、実車走行による耐偏摩耗性能とが高い相関性を有するパラメータPを知見した。各耐偏摩耗試験の試験方法の詳細は以下の通りである。   The inventors have found that parameter P having a high correlation between the uneven wear resistance performance by the wear testing machine M of the present embodiment and the uneven wear resistance performance by actual vehicle running through various experiments in such a determination step K4. Found out. The details of the test method of each uneven wear resistance test are as follows.

<摩耗試験機Mによる耐偏摩耗試験>
配合の異なる9種類のタイヤTが用意され、各タイヤTのトレッド部Taから各ゴムサンプルG1、G2が採取された。そして、各ゴムサンプルG1、G2を接着したローラ体5が準備され、下記条件でローラ体5を砥石面4に接触し押圧させて、4000m走行するように回転させた。そして、走行終了後に、ゴムサンプルGの摩耗量が測定された。パラメータPは、第1ゴムサンプルG1の摩耗量f1と第2ゴムサンプルG2の摩耗量f2との比(f2/f1)を含むもの、本実施形態では、比(f2/f1)が用いられた。タイヤには、トレッドパターンが付されている。主な仕様は以下のとおりである。
タイヤサイズ:195/65R15
ローラ体5の寸法(d1×W1):74×18mm
ゴムサンプルGの厚さt1:2.0mm
第1ゴムサンプルG1の幅Wa:9mm
第2ゴムサンプルG2の幅Wb:18mm
荷重F:40N
スリップ角α:6度
<Uneven wear resistance test with wear tester M>
Nine types of tires T having different formulations were prepared, and each rubber sample G1, G2 was collected from the tread portion Ta of each tire T. And the roller body 5 which adhered each rubber sample G1 and G2 was prepared, was made to contact the roller body 5 on the grindstone surface 4 under the following conditions, was pressed, and it was made to rotate so as to run 4000 m. Then, after the end of traveling, the wear amount of the rubber sample G was measured. The parameter P includes the ratio (f2 / f1) of the wear amount f1 of the first rubber sample G1 to the wear amount f2 of the second rubber sample G2, and in the present embodiment, the ratio (f2 / f1) is used. . The tire has a tread pattern. The main specifications are as follows.
Tire size: 195/65 R15
Dimension of roller body 5 (d1 × W1): 74 × 18 mm
Rubber sample G thickness t1: 2.0 mm
Width Wa of first rubber sample G1: 9 mm
Width Wb of second rubber sample G2: 18 mm
Load F: 40 N
Slip angle α: 6 degrees

<実車走行による耐偏摩耗試験>
ゴムサンプルGが取り出されたタイヤTと同じ仕様のタイヤTが排気量2000ccの乗用車の4輪に装着され、乾燥アスファルト路面のテストコースを下記の条件で6000km走行させた。走行後、テストドライバーが、トレッド部Taの陸部の偏摩耗の発生状況を目視により確認し、官能により耐偏摩耗性能を評価した。テストの結果を表1に示す。
リムサイズ:15×6J
内圧:230kPa
速度:60〜120km/h
<Uneven wear resistance test by running a car>
A tire T having the same specification as the tire T from which the rubber sample G was taken out was mounted on four wheels of a passenger car having a displacement of 2000 cc, and traveled a test course on a dry asphalt road surface for 6000 km under the following conditions. After running, the test driver visually confirmed the occurrence of uneven wear of the land portion of the tread portion Ta, and evaluated the uneven wear resistance performance by sensory. The test results are shown in Table 1.
Rim size: 15 × 6 J
Internal pressure: 230 kPa
Speed: 60 to 120 km / h

Figure 2019113406
Figure 2019113406

表1に示されるように、判定する工程K4では、パラメータPである比(f2/f1)が1に近いほど耐偏摩耗性を良と判定するのが望ましいことが理解される。また、判定する工程K4では、比(f2/f1)が1±0.2の範囲で耐偏摩耗性を良と判定するのが、さらに、望ましいことが理解される。これにより、本実施形態の評価方法では、実車走行試験による耐偏摩耗性能と相関性良く、評価できる。なお、ゴムの配合やタイヤサイズ、スリップ角αや荷重Fまたは実車走行の速度や内圧等の仕様を変更してさらに実験を行ったが、比(f2/f1)をパラメータPとすることにより、同様の高い相関性が示された。   As shown in Table 1, it is understood that in the determination step K4, it is desirable to determine that the partial abrasion resistance is good as the ratio (f2 / f1) that is the parameter P is closer to 1. Further, it is understood that it is further desirable to determine that the non-uniform wear resistance is good in the determination step K4 when the ratio (f2 / f1) is in the range of 1 ± 0.2. Thereby, in the evaluation method of the present embodiment, evaluation can be made with good correlation with the uneven wear resistance performance in the actual vehicle running test. The experiment was conducted by changing the specifications of the rubber composition, tire size, slip angle α, load F, speed of actual vehicle travel, internal pressure, etc., but by making the ratio (f2 / f1) the parameter P, Similar high correlation was shown.

なお、第1ゴムサンプルG1の幅Wa及び第2ゴムサンプルG2に幅Wbは、上述のような態様に限定されるものではない。第1ゴムサンプルG1の幅Wa及び第2ゴムサンプルG2の幅Wbは、第1ゴムサンプルG1の幅Waが第2ゴムサンプルG2の幅Wbよりも大きいものとした場合、その比(Wa/wb)が、例えば、1より大かつ5以下が望ましく、1.5〜3がさらに望ましい。また、各ゴムサンプルGの幅Wは、トレッド部Taの各陸部のタイヤ軸方向の幅(図示省略)と同じであっても良い。   The width Wa of the first rubber sample G1 and the width Wb of the second rubber sample G2 are not limited to those described above. When the width Wa of the first rubber sample G1 is larger than the width Wb of the second rubber sample G2, the width Wa of the first rubber sample G1 and the width Wb of the second rubber sample G2 are ratio (Wa / wb ) Is, for example, preferably more than 1 and 5 or less, and more preferably 1.5 to 3. Further, the width W of each rubber sample G may be the same as the width (not shown) in the tire axial direction of each land portion of the tread portion Ta.

このように、本実施形態の評価方法では、ゴム部材の耐偏摩耗性能の良否を判定できる。このため、例えば、この評価方法で良と判定されたゴム部材と同じ配合によってタイヤの構成部材、とりわけ、路面と接地するトレッドゴムを製造した場合、耐偏摩耗性能に優れたタイヤを製造することができる。   As described above, according to the evaluation method of the present embodiment, it is possible to determine whether the uneven wear resistance performance of the rubber member is good or bad. For this reason, for example, when a tire component, in particular, a tread rubber which is in contact with the road surface is manufactured by the same composition as a rubber member determined to be good by this evaluation method, a tire excellent in uneven wear resistance performance is manufactured. Can.

以上、本発明の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得る。   Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the illustrated embodiments, and can be modified in various aspects.

G ゴムサンプル
K1 準備する工程
K2 摩耗試験を行う工程
K3 摩耗量を測定する工程
K4 良否を判定する工程
M 摩耗試験機
G Rubber sample K1 Preparation step K2 Wear test step K3 Wear amount measurement step K4 Quality check step M Wear tester

Claims (10)

ゴム部材の耐偏摩耗性能を評価する方法であって、
同一の配合かつ剛性の異なる少なくとも第1ゴムサンプル及び第2ゴムサンプルを含む複数種類のゴムサンプルを準備する工程と、
前記第1ゴムサンプル及び前記第2ゴムサンプルを、摩耗試験機を用いて、同一試験条件で摩耗試験を行う工程と、
前記摩耗試験の後、前記第1ゴムサンプルと前記第2ゴムサンプルとの摩耗量を測定する工程と、
前記第1ゴムサンプルの前記摩耗量と前記第2ゴムサンプルの前記摩耗量との差に関連するパラメータに基づいて、前記ゴム部材の耐偏摩耗性能の良否を判定する工程とを含む、
ゴム部材の耐偏摩耗性能の評価方法。
A method for evaluating the uneven wear resistance of a rubber member, comprising
Preparing a plurality of rubber samples including at least a first rubber sample and a second rubber sample having the same composition and different rigidity;
Performing a wear test on the first rubber sample and the second rubber sample under the same test conditions using a wear tester;
Measuring the amount of wear of the first rubber sample and the second rubber sample after the wear test;
Determining the quality of the uneven wear resistance of the rubber member based on a parameter related to the difference between the amount of wear of the first rubber sample and the amount of wear of the second rubber sample.
Evaluation method of uneven wear resistance of rubber member.
前記ゴムサンプルは、タイヤから採取されたものである、請求項1記載の評価方法。   The evaluation method according to claim 1, wherein the rubber sample is collected from a tire. 前記ゴムサンプルは、タイヤのトレッド部から採取されたものである、請求項1記載の評価方法。   The evaluation method according to claim 1, wherein the rubber sample is collected from a tread portion of a tire. 前記第1ゴムサンプル及び前記第2ゴムサンプルは、同一長さかつ異なる幅を有するシート状である、請求項1ないし3のいずれかに記載の評価方法。   The evaluation method according to any one of claims 1 to 3, wherein the first rubber sample and the second rubber sample are in the form of a sheet having the same length and different widths. 前記摩耗試験機は、室内摩耗試験機である、請求項1ないし4のいずれかに記載の評価方法。   The evaluation method according to any one of claims 1 to 4, wherein the wear tester is an indoor wear tester. 前記パラメータは、前記第1ゴムサンプルの前記摩耗量と前記第2ゴムサンプルの前記摩耗量との比を含む、請求項1ないし5のいずれかに記載の評価方法。   The evaluation method according to any one of claims 1 to 5, wherein the parameter includes a ratio of the amount of wear of the first rubber sample and the amount of wear of the second rubber sample. 前記判定する工程は、前記比が1に近いほど耐偏摩耗性を良と判定する、請求項6記載の評価方法。   The evaluation method according to claim 6, wherein in the determination step, it is determined that the partial abrasion resistance is good as the ratio is closer to 1. 前記判定する工程は、前記比が1±0.2の範囲で耐偏摩耗性を良と判定する、請求項6または7に記載の評価方法。   The evaluation method according to claim 6 or 7, wherein in the determination step, the uneven wear resistance is determined to be good in the range of 1 ± 0.2 of the ratio. 請求項1乃至8のいずれかに記載の評価方法によって良と判定されたゴム部材と同じ配合でタイヤの構成部材を作製する工程を含む、
タイヤ製造方法。
A process for producing a tire component with the same composition as a rubber member determined to be good by the evaluation method according to any one of claims 1 to 8,
Tire manufacturing method.
前記タイヤの構成部材は、トレッド部に配される、請求項9記載のタイヤ製造方法   The tire manufacturing method according to claim 9, wherein the component of the tire is disposed in the tread portion.
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