For the processing parts are frame-shaped planes or steps of unequal height, then the CNC milling machine with the point---linear system can be selected. If the machining part is a curved contour, the system that selects the two-coordinate linkage and the three-coordinate linkage should be determined according to the geometry of the surface. According to the requirements of parts processing, on the basis of the general CNC milling machine, the numerical control indexing head or the numerical control rotary table can be added. At this time, the system of the machine tool is a four-coordinate numerical control system, which can process spiral grooves and blade parts.
The smaller-sized lifting table CNC milling machine has a table width of less than 400mm. It is most suitable for the machining of small and medium-sized parts and the contour milling of complex shapes. For larger specifications, such as gantry milling machines, the workbench is above 500-600mm, which is used to solve the processing needs of large and complex parts.
China has developed the accuracy standard for CNC milling machines, among which CNC vertical milling machine lifting table milling machines have professional standards. The standard stipulates that the linear motion coordinate positioning accuracy is 0.04/300mm, the repeat positioning accuracy is 0.025mm, and the milling precision is 0.035mm. In fact, the machine tool factory precision has a considerable reserve, which is about 20% smaller than the tolerance of the national standard. Therefore, from the perspective of accuracy selection, the general CNC milling machine can meet the processing needs of most parts. For parts with higher precision requirements, you should consider the use of precision CNC milling machines.
For high volume, the user can use a special milling machine. If it is a small and medium batch and it is often repeated periodically, then CNC milling machines are very suitable, because the multi-tools, programs, etc. in the first batch can be stored and reused. In the long run, the high degree of automation of milling machines replaces ordinary milling machines, and it is inevitable to reduce labor labor and increase productivity.