The CNC machining of mechanical parts is composed of basic surfaces such as plane, outer cylindrical surface, inner cylindrical surface or curved surface, and forming surface due to various structural shapes. Each surface has a variety of processing methods. When selecting a CNC processing method, the corresponding processing method and processing plan should be selected according to factors such as the processing accuracy, surface roughness, material, structural shape, size, and production type of the part.

1. The choice of surface processing method for the outer surface of CNC machined parts

The main processing methods of the outer surface are turning and grinding. When the surface roughness is required to be small, it is necessary to carry out smoothing processing. The closest processing plan can be selected according to the processing surface requirements, the structural characteristics of the parts, the production type, the blank type and material properties, the size, the geometric accuracy and the surface roughness requirements, and the on-site equipment and other conditions.

2. The choice of CNC machining plane processing method

The main processing methods of planes are milling, planing, turning, grinding and broaching, etc. The planes with high precision require frequent grinding or scraping.

3. The choice of CNC machining inner hole surface machining method

The surface processing methods of the inner hole include drilling, reaming, boring, drawing, grinding and finishing. Commonly used hole processing solutions should be selected reasonably according to the processing requirements, size, specific production conditions, batch size, and whether there are pre-made holes on the blank.

Plane contours are mostly composed of straight lines and arcs or various curves, and three-coordinate CNC milling machines are usually used for two-axis semi-coordinate machining.