OBRABOTKAMETALLOV Vol. 24 No. 3 2022 TECHNOLOGY а b c be partially in a state of breaking-in until it is completely worn out. This is especially true for the sections of track of different curvature, descents or ascents, braking or acceleration sections on the processed run. To eliminate this disadvantage of the HSG method, the Siberian Transport University (STU) put forward a method of passive grinding using the end of an abrasive wheel [16]. In the proposed method, the position of grinding wheels in relation to the rail is similar to the method of active processing with rotating grinding wheels used on rail grinding trains of the RGT type (Fig. 5), while the abrasive tool is not driven by an electric engine and is freely fi xed on the axis of rotation. Fig. 4. The scheme of breaking-in of an abrasive wheel by HSG technology: a – process beginning; b – breaking-in process; c – broken-in tool a b Fig. 5. Grinding equipment of RShP rail grinding trains: a – general view of the grinding equipment RShP; b – scheme of the grinding wheels arrangement along the rail transverse profi le In this case grinding occurs by pressing the end of the abrasive wheel against the surface of the rail being processed and simultaneously installing it with an eccentricity e relative to the corresponding grinding track (Fig. 6), thereby providing passive rotation of the grinding wheel, due to the action of friction forces as the rail grinding train moves linearly [16] (hereinafter referred to as the STU method). An additional advantage of the STU method is the possibility of its implementation on the basis of the existing design of rail grinding trains of the RCP type, as well as the possibility of combining passive and active grinding technologies in one track machine. Assessment of the possibility of applying certain methods of rail processing for given operating conditions should use the existing scientifi c basis of passive grinding, which is currently absent due to its limited
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