1. Process the datum surface parts first.

Because the surface is used as the positioning datum during the machining process, so as to provide a precise datum for the subsequent processing as soon as possible.

2. Dividing the processing stages.

Surfaces with high processing quality requirements are divided into processing stages, which can generally be divided into three stages: rough machining, semi-finishing and finishing. Mainly to ensure the processing quality; facilitate the rational use of equipment; facilitate the arrangement of the heat treatment process; and facilitate the discovery of blank defects. 　　

3. After the first hole, for the square box, bracket and connecting rod, the plane should be processed first and then the hole should be processed. In this way, the holes can be positioned on the plane to ensure the position accuracy of the plane and the holes, and it is convenient to process the holes on the plane. 　　

4. The main surface finishing (such as honing, grinding, fine grinding, etc.) should be carried out in the later stage of the process route to prevent the finishing surface from being damaged due to inter-process and installation.

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