Structuroscopy of Coils after High-Temperature Mechanical Treatment on the Basis of Measurements of Rayleigh Waves Velocity

For the manufacture of spring springs rolling stock (wagons, locomotives, cars), bars made steels are used. With high-temperature machining, when winding and quenching them, there is a difference in cooling rates inner outer sides coils, which leads to structural state affects durability springs. The aim work study effect changes surfaces steel coils after high–temperature machining operations on measured characteristics Rayleigh acoustic waves. propagation velocities waves spring-spring 60C2A hightemperature investigated. shadow method autocirculation with piezoelectric converters CTS-19 frequency 5 MHz special block design were used for research. provide input reception wave along forming surface spring. It shown that comparing results measuring velocity fi base by coil generator sensitive disturbances structure material appearance defects. An unambiguous relationship states found. As result measurements, conclusion was about significant sensitivity under study. increase detected contact zone mandrel relative side coil, signaling incomplete hardening this during machining. speed different samples approximately up 1 % (≈ 30 m/s), value assessing quality