Pedrail pin bush fine-machining device

A finishing device for track pin bushes, comprising a principal axis, a holding fixture of the principal axis, work piece positions, a tailstock rotary center and a tailstock bush etc; aided by bidirectional cutting tools, the utility model realizes finish machining of track pin bushes, wherein front end of the principal axis is provided with a holding fixture; work piece positions are provided at the front end of the holding fixture of the principal axis; and the tailstock rotary center is provided in correspondence with the holding fixture of the principal axis; the tailstock rotary center is positioned on the tailstock bush of the lathe and is controlled by a foot switch to realize extension of the tailstock rotary center through hydraulic system of the lathe; the tailstock rotary center works with the holding fixture at the front end of the principal axis to prop up the welling bush of the springing the pin bush to realize the positioning and clamping of the pin bush. The bidirectional cutting tools can finish turning of the end faces and outer ring surfaces at both ends during one clamping motion and can finish turning of the other end during reverse to realize fast processing with high production efficiency. By improving the structure of the processing device, the utility model can integrate two processes into one, namely the processing and grinding of end faces and the processing of outer ring surfaces. Being able to simplify the process, the utility model is applicable to mass production of pin bushes.