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In the rolling subsystem of the railway vehicles, the wheelset is the main component. This is subject to large and variable loads and to a continuous wear-off process. The wheels’ rolling surfaces of the wheelset are processed on specialized lathes under precision conditions (profile, roughness) defined by specific rules. The geometric elements defining the tread profile are rigorously defined in norms and standards, which implies specific precision conditions. Profiling and re-profiling are performed by simultaneously turning both wheels of the wheelset. The technological parameters are determined considering the material to be machined, the material of the cutting tool (recommended by the catalogues), the quality and the roughness of the processed surfaces, the rigidity of the lathe, the power and torque of the electric motors used or driving the generating kinematic chains (main, feed). Also, the status and dimensions of the machining allowance, number of passes and the type of NC port-program used, are very important. In the paper are presented as examples some geometrical characteristics of the wheels and wheelset and are recommended values of the technological parameters, which are set numerically or experimentally. Based on these, values of speed, forces, moments and cutting power could be calculated.

Main aspects of establishing the machining parameters of the railway wheelset’s rolling surfaces