What are the general rules for machining mechanical parts?
General rules for machining of mechanical parts: 1. Benchmark first
Differentiate processing stages 3. Face before hole 4. Finishing
The detailed criteria are: 1. Benchmark first
Namely, the datum plane shall be machined first. During the machining process of non-standard parts, the surface used as the positioning datum shall be machined first, so as to provide precise datum for the processing of subsequent processes as soon as possible.
2. Differentiate processing stages
The surface with high machining quality requirements can be divided into three stages: rough machining, semi finish machining and finish machining. The first is to ensure the processing quality; It is conducive to scientific use of equipment; It is convenient to organize the heat treatment process; And it is convenient to find the defects of the blank.
3. Face before hole
For parts such as box, bracket and connecting rod, the plane shall be machined first and then the hole shall be machined. In this way, the machining hole can be positioned with a plane to ensure the position accuracy of the plane and the hole, and facilitate the machining of the hole on the plane.
4. Finishing
The finishing of the primary surface, such as grinding, honing, finishing, rolling, etc., should be placed at the end of the process path. The formulation of general guidelines for precision parts processing technology and the formulation of precision parts processing technology procedures can be generally divided into two parts. The first step is to draw up the process route for parts processing, and then determine the process scale, equipment and process equipment used in each process, as well as the cutting standard and man hour quota.
