Mechanical processing method of axle bridge for rail vehicle

The invention relates to a mechanical processing method of an axle bridge for a rail vehicle. The method comprises the following steps: (1) treating the bottom surface of an axle bridge blank as a positioning surface, and clamping; drilling central holes in the end surfaces of two shaft necks; (2) ejecting ejector pins into the central holes in the shaft necks; roughly turning the outer circumferences of the rotating shaft necks; roughly milling the bottom surface of each mounting seat and the bottom surface of each shaft head, and drilling holes in the bottom surfaces; roughly milling the top parts of the shaft heads and the upper end of each mounting seat; (3) modifying the central holes in the two ends of the shaft necks after stress-relieving treatment; (4) positioning and clamping in central holes in the two ends of a semi-finished axle bridge through the ejector pins on a machine tool; performing fine turning for outer circles of the shaft necks; performing fine milling for the planes of the bottom part