Machining method for tool rest guide rail assembly of gear hobbing machine

The invention discloses a machining method of a gear hobbing machine tool rest guide rail assembly, which comprises the following steps that a pre-machining tool rest seat body and a pre-machining tool rest sliding piece are provided, the pre-machining tool rest seat body is provided with a guide groove which is flared from bottom to top, and the guide groove extends along the longitudinal direction and is used for installing the pre-machining tool rest sliding piece; machining the pre-machined tool rest sliding part to obtain a tool rest sliding part; coating grooves are formed in the two groove walls, oppositely distributed in the transverse direction, of the guide groove correspondingly, so that supporting sides are formed in the positions, located on the upper sides and the lower sides of the coating grooves, of the groove walls; mounting equal-height pads on the supporting sides; the tool rest sliding piece is installed in the guide groove, glue is injected into the coating groove till the coating groove