MG Roewe Maxus Engine have irregular and complex shapes and are difficult to locate. The size heads are connected by thin rods and are easy to deform. The size tolerance, shape tolerance, and surface roughness requirements are high.

The processing technology of MG Roewe maxus engine follows the principle of surface first, hole second, and reference first, other things second. MG Roewe Maxus Engine are parts with poor rigidity, so the positioning clamp should reduce the influence of deformation on processing accuracy.

(1) Processing of large head holes. The traditional process generally cuts the large head holes after cutting, or processes them into elliptical shapes before cutting. Because it is intermittent processing, the vibration is large, the tool wears quickly, and the tool consumption is large. The folding process processes the large head holes into circles.

(2) Separation of Bare Engine body and cover. The traditional process adopts the fracture (or milling, sawing) method, and the fracture process fractures after the bolt hole is processed.

After the fracture process is adopted, the separation surface of the Bare Engine and the Bare Engine cover is fully meshed, which improves the combination quality of the Bare Engine cover and the Bare Engine separation surface, so there is no need to broach and grind the separation surface.

Since the separation surface is fully meshed, there is no need to add additional positioning, such as bolt hole positioning (or positioning ring hole), when assembling the Bare Engine and the Bare Engine cover. As long as the two bolts are tightened, the fine processing of the bolt holes can be saved.

(3) Processing of the bonding surface. The traditional process is to grind the bonding surface after fracture. The assembly positioning of the Bare Engine body/cover depends on the positioning holes in the two bolt holes and the positioning part of the bolts.

Therefore, there are strict requirements on the verticality of the bolt hole to the separation surface and the center distance size of the two bolt holes.

The dimensional error causes residual stress to remain in the Bare Engine assembly after the Bare Engine and the Bare Engine cover are assembled.