1、Benchmark go first
That is mean, the first processing of datum, parts in the machining process, the outside as locating basis should be the first to be processed out, so as to provide follow-up process as soon as possible to refine the benchmark.
2、划分加工阶段 divided processing stage
High quality machined appearance, are divided processing stage, generally can be divided into roughing, semi-finishing and finishing three stages. Mainly in order to ensure the quality of processing; is conducive to scientific application of equipment; easy to arrange heat treatment processes; and to facilitate the discovery of rough defects.
3、first plaine, then the hole
For the box, bracket and connecting rod and other parts should be machined plane after processing holes. This makes it possible to position the holes in a plane, to ensure the positional accuracy of the plane and the holes, and to facilitate the machining of the holes in the plane.
The main appearance of finishing, such as grinding, honing, grinding, rolling, etc., should be placed at the end of the process stage. The formulation of the general principle of precision parts processing technology route, the formulation of precision parts processing technology, can be divided into two parts. The first is to develop parts processing route, and then determine the size of each process steps, equipment and process equipment and cutting norms, working hours and so on.