We divide the CNC processing service into the following four stages:
1. Face first then hole
For parts such as boxes, brackets and connecting rods, the plane should be machined first and then the hole. In this way, the holes can be positioned and processed in a plane to ensure the accuracy of the position of the plane and the hole, and it is convenient for the processing of the holes on the plane.
2. Processing the datum first
During the processing of parts, the surface used as the positioning reference should be processed first, so as to provide a precise reference for the processing of subsequent processes as soon as possible. It is called "benchmark first".
3. Finishing
Finishing of the main surface (such as grinding, honing, precision grinding\rolling processing, etc.) should be carried out at the final stage of the process route. The surface finish after processing is above Ra0.9um, and slight collisions will damage the surface. In Japan , Germany and other countries, after finishing, they must be protected with flannel. It is absolutely forbidden to directly touch the workpiece with hands or other objects, so as to avoid damage to the finished surface due to transfer and installation between processes.
Fourth, divide the processing stage
Surfaces with high processing quality requirements are divided into processing stages, which can generally be divided into three stages: roughing, semi-finishing and finishing. Mainly to ensure the processing quality; to facilitate the rational use of equipment; to facilitate the arrangement of heat treatment procedures; and to find rough defects when convenient.