Experimental studies of high-speed grinding rails modes

Abstract

Introduction. Rails’ grinding in the conditions of a railway track is a priority for extending its life cycle due to the timely removal of tread surface defects and formation of required transverse profile. Today, 14 RSHP-48 rail grinding trains are used in Russia. At the same time, most rail grinding trains are ending its service life. Therefore, the development of a fundamentally new rail grinding train with increased efficiency is an urgent task. Siberian transport university is working together with the Kaluga plant “Remputmash” to create a new rail grinding train named RSHP 2.0. The rail grinding train RSHP 2.0 is based on the technology of high-speed rail grinding, which is based on increasing working speed of rail grinding train by increasing rotational speed of grinding wheels and setting the angle of attack. The aim of this work is to study rails’ grinding modes on a specially designed installation URSH, which implements the technology of high-speed grinding rails by increasing speed of grinding wheels rotation up to 5,000 rpm. Research methods. Grinding wheel speed control was carried out by IT-5-ChM “Termit” electronic tachometer and “Megeon 18005” laser tachometer. The angle of attack of grinding wheel was measured by digital, three-axis accelerometer-inclinometer ATst 90. The force of pressing grinding wheel to the rail was evaluated by strain-resistive sensors M50-0.5-C3. The measurement of head rail transverse profile before and after grinding and evaluation of metal removal were carried out by a PR-03 rail profiler. The width of grinding track was controlled by ShTsTs-I-300-0.01 caliper. The surface roughness of rail sample after machining was measured by TR 200 portable instrument. Results and discussion. Based on research results of CRS, the parameters of the working equipment of designed grinding rail train, which implements the technology of high-speed rail grinding, the influence of grinding modes on the formation of the quality parameters of the machined rail surface are established, and the optimal values of the forces of pressing the grinding wheel to the rail are determined.