That is, the reference surface is processed first. During the machining process of the part, the appearance as the positioning reference should be processed first, so as to provide a precise reference for the subsequent processing as soon as possible.
Appearances that require high mechanical processing quality are divided into processing stages, which can generally be divided into three stages: rough processing, semi-finishing and finishing. Mainly to ensure the processing quality; to facilitate the scientific application of equipment; to facilitate the arrangement of the heat treatment process; and to facilitate the discovery of blank defects.
For parts such as box body, 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.
The main surface finishing processing, such as grinding, honing, fine grinding, rolling processing, etc., should be placed at the end of the process route. The general principles of drawing up the process route of precision parts and the formulation of the process rules of precision parts can be roughly divided into two links. The first is to draw up the process route of the parts processing, and then determine the process size of each process, the equipment and process equipment used, the cutting specifications, and the working hours quota. The formulation of the processing route of precision parts is to formulate the overall layout of the process. The main task is to select the processing methods of each appearance, determine the machining sequence of each appearance, and the number of processes in the entire process.
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