Analysis of Tool Wear and Wear Mechanism in Dry Forming Milling for Rail Milling Train

摘要

Milling tools of the rail milling train have to face severe weariness due to the uneven surface hardness, inconsistent cutting rate and uncertain status of the rail itself as well as the vibration caused by the suspension system of the rail milling train and its characteristic hunting motion. This study performed a milling tool wearing status analysis and conducted relative research on wearing mechanisms with electron scanning microscope based on the typical milling tools and specific working conditions of rail milling train. Results indicate that the wearing status of rail milling train consists mainly of crater wear, notch wear, cutting edge chipping, surface exfoliation, milling sintering and tool break. The tool wearing conditions of rail milling train, compared with ordinary milling process, are significantly severe, and associated with multiple types of wearing status of which certain relevance exists. The research is of great significance for the improvement of the milling tool, the optimization of the process and the improvement of the mobile milling quality of the rail.