Non-destructive Method of Controlling the Depth of Tempering of Parts of the Mechanical Part of Locomotives

摘要

The article discusses ways to improve the ultrasonic method developed in USURT together with NPO Introtest JSC to monitor the depth of surface hardening of parts of the mechanical part of locomotives. The nondestructive ultrasound method is developed as an alternative to costly destructive methods. The essence of the method is considered on the example of a spring suspension roller, one of the dynamically loaded surface-hardened parts of the mechanical part of a locomotive. The processes occurring in the system "piezoelectric transducer - object of control", energy losses accompanying these processes, as well as the process of reflection and transmission of the ultrasonic wave at the border "prism - object of control" are considered. The results of experimental studies on the installation of "Etalon", as well as the results of measuring the absorption coefficient for a prism made of various materials. The energy transparency coefficients for the "prism - spring suspension roller" border are calculated. The best material is chosen for the prism of a piezoelectric transducer - crystalline polystyrene.