Friction and wear characteristics between cermet alloy and cast iron (Part2)

Friction and wear tests between the TiCN cermet chip and FC250 cast iron ro ller have been carried out in air under unlubricated conditions. RMS value and FFT spectrum of acoustic emission (AE) signals during the tests have be en analyzed in relation to the friction force-sliding distance curves. In t he previous report,the friction force-sliding distance curves in the variou s wear conditions could be divided into three groups(type A,B,and C),depend ing on the characteristic of the profile. The amount of wear after the test s classified as type A was remarkably little both in chip and roller. On th e other hand, the amount of wear was relatively large in the cermet chip fo r type B, and in cast iron roller for type C. The ratio of maximum intensity of AE signal in a 1000 similar to 1600kHz fr equency range to that in a 100 similar to 200kHz range in a FFT spectrum wa s larger than 1 in the type A, In contrast, the ratios for type B and C wer e remarkably smaller than 1. Thus, the FFT analysis of the AE signal is fou nd 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 rol ler were discussed in relation to the results of AE analysis.