1. First cast a curved plate with a guide rail with cast iron, and then process the tail end face of the machine tool.

2. Secondly, make sure that it is 90 degrees with the plane of the guide rail, plus the plane of the bending plate of the casting, and then fasten the two end faces together.

3. Finally, based on the bed surface of the machine tool, draw the processing line of the extended guide rail, process the extended guide rail according to the line, and connect it with the machine tool for correction.