Numerical control machining process is derived from conventional machining process, and it is an organic combination of conventional machining process, computer numerical control technology, computer aided design and auxiliary manufacturing technology. Due to the continuous development of technology, more and more parts need precision machining in modern manufacturing industry, and the requirements for machining accuracy and workpiece surface complexity are also getting higher and higher. Therefore, CNC machining has been widely concerned, but in terms of cost saving, CNC machining is still more expensive than traditional machining. Now let's introduce the difference between CNC machining and traditional machining.
1. Processing technology
In the ordinary machining process, both the positioning datum, clamping method, tools, cutting methods and other aspects can be simplified, but the data processing process is more complex, and these factors need to be fully considered. Moreover, even if the same processing task, the CNC processing process can have multiple schemes, which can arrange multiple processing parts and processing tools as the main line, The process is characterized by diversification, which is the difference between CNC processing and traditional machining process.
2. Clamping and fixture
In CNC machining process, not only the coordinate direction of fixture and machine tool should be relatively fixed, but also the dimensional relationship between parts and machine tool coordinate system should be coordinated. In addition, the two steps of positioning and clamping need to be effectively controlled during the clamping process. Moreover, under the traditional machining process, due to the limited processing capacity of the machine itself, it is necessary to carry out multiple clamping during the processing. And the need to use special fixtures, which leads to higher costs in the design and manufacturing of fixtures, virtually increasing the production cost of products. However, CNC machining process positioning can be debugged with instruments, and in most cases, special fixture design is not required, so its cost is relatively low.
3. Tools
In the process of machining, the tool selection needs to be determined according to the different machining processes and methods. Especially in CNC machining, the use of high-speed cutting is not only conducive to the improvement of machining efficiency, but also can guarantee the machining quality, effectively reduce the probability of cutting deformation, and shorten the machining cycle. Therefore, the demand for cutting tools is further increased under the instruction of cutting.
At present, there is also a dry cutting method, which can cut without cutting fluid or only with a small amount of cutting fluid, so the tool needs to have good heat resistance. Compared with ordinary machining process, CNC machining process has higher requirements on the performance of tools.
