1) Rough machining stage The rough machining stage is also the processing stage before Bare Engine: mainly the processing of the reference surface.

Including the processing of auxiliary reference surfaces, as well as the processing after Bare Engine, such as milling and grinding of two mating surfaces.

2) Semi-finishing stage The semi-finishing stage is also the processing after Bare Engine, such as fine grinding of two planes, semi-finishing of large holes, chamfering of hole mouths, etc.

In short, this is a stage for preparing to finish large and small holes.

3) Finishing stage The finishing stage is mainly to ensure that the large and small holes on the main surface of the MG Roewe Maxus Engine meet the requirements of the drawing, such as honing large holes, fine boring of small bearing holes, etc.