Friction and wear characteristics between cermet alloy and cast iron (Part 2): an approach to the monitoring by AE signal analysis

摘要

Friction and wear tests between the TiCN cermet chip and FC250 cast iron roller have been carried out in air under unlubricated conditions. RMS value and FFT spectrum of acoustic emission (AE) signals during the tests have been analyzed in relation to the friction force-sliding distance curves. In the previous report, the friction force - sliding distance curves in the various wear conditions could be divided into three groups (type A, B, and C), depending on the characteristic of the profile. The amount of wear after the tests classified as type A was remarkably little both in chip and roller. On the other hand, the amount of wear was relatively large in the cermet chip for type B, and in cast iron roller for type C. The ratio of maximum intensity of AE signal in a 1000～1600 kHz frequency range to that in a 100～200 kHz range in a FFT spectrum was larger than 1 in the type A. In contrast, the ratios for type B and C were remarkably smaller than 1. Thus, the FFT analysis of the AE signal is found to be effective to monitor whether the wear behavior is mild wear (Type A) or severe one (Type B and C). The origin of such three types of friction force-sliding distance curve and the tendency of wear both in chip and roller were discussed in relation to the results of AE analysis.