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Where is the difference between CNC machining of precision mechanical parts and ordinary machining?

2022-08-24

In the precision mechanical parts processing industry, it is very appropriate to use the saying “a little bit, a thousand miles away”. The following editor will tell you about the difference between CNC machining and ordinary machining of precision mechanical parts.

1. Differences in processing methods: The processing methods that should be used carefully in the traditional mechanical parts processing technology will become simple and feasible in CNC machine tool processing. During hole processing, the empty tool method and the dressing method used in the traditional processing technology are replaced by the numerical control dressing method in the numerical control processing technology.

2. Differences in tool selection: The tools required by different processing techniques and methods are definitely different, especially in high-speed cutting, the processing efficiency and quality of CNC machine tool precision mechanical parts have been greatly improved, as well as cutting deformation and processing cycle. decrease very much. Compared with traditional machining technology, CNC precision machining has significantly enhanced performance requirements on all aspects of the tool, and the installed tool has changed from a single tool to many tools.

3. Differences in thermal deformation: Thermal deformation is one of the inevitable problems in the cutting process of workpieces. When the parts are precision machined, thermal deformation will have a direct impact on the machining accuracy. The traditional processing method has many processes, and the connection of each process has a certain buffer time, which can reduce the temperature of the part before proceeding to the next process, effectively reducing the influence of thermal deformation.

4. The high-speed machining in the machining of CNC mechanical parts has the incomparable advantages of the traditional machining technology. The following takes the mold machining as an example to explain in detail. In the traditional processing technology, multiple processing steps are usually required to complete the mold processing task, but only 1-2 steps are required to complete the high-speed processing. These two processes are electrical machining and grinding.

CNC machining can process multiple surfaces continuously, and the cutting heat cannot be released in time. If it is prevented by controlling the time interval of each process, it will affect the machining efficiency of mechanical parts. Therefore, when CNC machining is used for high-precision mechanical parts, it is also necessary to take the method of cooling first and then finishing to reduce the influence of thermal deformation.