1、 Face before hole
For the box, bracket and connecting rod, the plane should be machined first and then the hole should be machined
In this way, the hole can be processed by plane positioning to ensure the orientation accuracy of the plane and the hole, and bring convenience to the processing of the hole on the plane.
2、 Machining datum first
Parts in the processing process, as a positioning reference surface should be processed first, in order to provide fine reference for the subsequent process as soon as possible. It is called “benchmark first”.
3、 Finishing
The main surface finishing (such as grinding, honing, finishing, rolling, etc.).
It should be carried out in the final stage of the process road. The surface finish after processing is above ra0.9um. Slight bumps will damage the surface. In Japan, Germany and other countries, after finishing, flannelette should be used for maintenance. It is definitely forbidden to touch the workpiece directly by hand or other objects to avoid damage to the surface of finishing due to the transfer and device between processes.
4、 Distinguish processing stages
The appearance with high processing quality requirements can be divided into three stages: rough processing, semi finishing and finishing. First of all, it is to ensure the processing quality; it is conducive to the rational use of equipment; it is convenient to organize the heat treatment process; and it is convenient to find the defects of blank.
