切削力測定によるブレーキ摩擦材の耐摩耗性評価

抄録

In this study, the authors examined an application of cutting force measurement using SAICAS as one of the methods for evaluating wear resistance that is simpler than full-scale brake tests. The relationship between the estimated shear strength obtained from cutting force measurements and the specific wear rate obtained from full-scale brake tests was investigated for several copper-based sintered alloy brake friction materials used in high-speed train, each of which has different composition. In the cutting force measurements, a cutting depth of 10 μm was applied to the specimen using a 0.3 mm wide blade with a rake angle of 5 degrees. The horizontal force measured was then used to calculate the estimated shear strength based on the cutting theory. Full-scale brake tests were repeated with an initial speed of 50 km/h and a contact force of 10.3 kN, and the specific wear rate was calculated from the measured wear mass. As a result, the comparison of the experimental results showed a strong correlation between the estimated shear strength and the specific wear rate of the friction materials. This suggests that the cutting force measurement can potentially be used to evaluate wear resistance.