Our rework plan is as follows:1. Firstly, the four large holes are welded by laser cladding technology at the position shown in the figure, and the thickness of one side is about 0.5mm;2. Milling one side of parting surface of upper and lower boxes is about 0.3mm;3. After correcting the two sides, install the locating pins, tighten the bolts, re process the four large holes to the drawing requirements, and mill out the two sides at the same time.