1、Reference first
That is, the first processing datum surface, parts in the machining process, as the appearance of the positioning datum should be machined first, in order to provide a fine datum for the subsequent processes as soon as possible.
2, divide the processing stage
Mechanical processing quality requirements of the appearance, are divided into processing stages, generally can be divided into roughing, semi-finishing and finishing three stages. Mainly to ensure the quality of processing; conducive to the scientific application of equipment; to facilitate the arrangement of heat treatment processes; and to facilitate the discovery of defects in the blank.
3、First face and then hole
For the box, bracket and connecting rod and other parts should be processed first plane after processing holes. This will be able to plane positioning processing holes, to ensure the position of the plane and hole accuracy, and to the plane of the hole processing to bring convenience.
4、Light finishing processing
The main appearance of the finishing process, such as grinding, honing, fine grinding, rolling processing, etc., should be placed at the end of the process route stage. The development of precision parts machining process route general principles, precision parts machining process procedures, can be broadly divided into two links. First of all, the process route of parts processing, and then to determine the process size of each process, the equipment and process equipment used, as well as cutting specifications, work quotas.
Precision parts processing process route is to develop the overall layout of the process, the main task is to select the processing method of each appearance, determine the mechanical processing sequence of each appearance, and the number of processes in the entire process.