This machine is mainly used for the recovery and grinding of welded joints,calendering burrs,rail surface repair,waveform wear,etc.in railway rail maintenance and construction.Not only the technical performance such as copying accuracy and grinding efficiency has been greatly improved,but also the intelligent control of grinding wheel feed has been realized due to the development and application of NC feed unit.The operation steps of construction operation and measurement are greatly simplified,and the problem of''excessive polishing''in construction is avoided.