Metal machining uses the rotating motion of the workpiece and the linear or curved motion of the tool to change the shape and size of the blank and process it to meet the requirements of the drawing.

Turning is the method of cutting the workpiece on the lathe by using the workpiece rotation relative to the tool. The cutting energy of turning is mainly provided by the workpiece rather than the tool. Turning is a basic and common machining method, which plays an important role in production.

Turning is suitable for processing rotary surface, most of the workpiece with rotary surface can be processed by turning method, such as internal and external cylindrical surface, internal and external conical surface, end face, groove, thread and rotary forming surface, etc., the tool used is mainly turning tool.

Among all kinds of metal cutting machine tools, lathes are widely used, accounting for about 50% of the total number of machine tools. Lathe can be used to turn the workpiece, but also can drill, reamer, tap and knurling cutter drilling, reaming, tapping and knurling, etc., according to the process characteristics, layout form and structural characteristics of the different, lathe can be divided into horizontal lathe, landing lathe, vertical lathe, turret lathe and copy lathe, most of which are horizontal lathe.

CNC turning is a typical representative of modern manufacturing technology, in various fields of manufacturing such as aerospace, automotive, mold, precision machinery, household appliances and other industries have an increasingly wide range of applications, has become an indispensable processing means in these industries.

In order to produce qualified parts for metal machining, it is first necessary to analyze and determine the process process and process parameters of the parts according to the accuracy and calculation requirements of the parts drawings, etc., and prepare a suitable CNC machining program with the specified numerical control programming code and format. Programming must pay attention to the specific CNC system or machine tool, should be strictly in accordance with the provisions of the machine tool programming manual for programming. However, from the essence of the CNC processing content, the instructions of each CNC system are set according to the actual processing requirements.