CNC numerical control processing technology is a type of mechanical processing, and it also follows the cutting laws of mechanical processing, being largely similar to the processing techniques of ordinary machine tools. As it is an automated processing method that applies computer control technology to mechanical processing, it has the characteristics of high processing efficiency and high precision. Its processing technology has its own uniqueness, with a relatively complex process and a detailed and meticulous arrangement of work steps. 
The CNC numerical control processing technology involves the selection of tools, the determination of cutting parameters, and the design of the tool path route. The CNC numerical control processing technology is the foundation and core of numerical control programming. Only with a reasonable process can high-efficiency and high-quality numerical control programs be compiled. The criterion for evaluating the quality of a numerical control program is: shorter processing time, less tool wear, and the production of more effective workpieces. 
The numerical control processing procedure is a part of the overall processing technology for the workpiece, and even a single process. It needs to coordinate with the preceding and subsequent processes to meet the assembly requirements of the entire machine or mold, so as to produce qualified parts. 
The numerical control processing procedures are generally divided into rough machining, medium and fine chamfering machining, semi-finish machining and finish machining, etc. 
For the rough machining in CNC processing, it is advisable to use larger tools. Within the power range of the machine or the capacity of the tool, use a larger cutting volume to quickly remove a large amount of workpiece material. To prevent the cutting vibration during rough machining from causing the workpiece to loosen, it is necessary to promptly calibrate and check after rough machining. If necessary, re-set the tool. After rough machining, the rough machining tool can be used for the fine processing of the reference surface to prepare for the subsequent calibration checks. For workpieces with complex cavities, since a larger tool was used for rough machining, there is a lot of remaining material at the corners. Therefore, a smaller tool than that used in rough machining should be used for secondary rough machining or chamfering. In cases where the machining area is large, semi-finish machining can be carried out to reduce tool wear. For each of the above steps, sufficient allowance must be left to prevent over-cutting. Finally, the finishing process is carried out. Generally, it is necessary to inspect on the machine before disassembling and only after passing the inspection can the workpiece be removed. Then, prepare for the next processing. 
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