1. Processing characteristics
For machining steps with frame-shaped planes or steps of different heights, then a point --- linear CNC milling machine can be used. If the machining part is a contour of a curved surface, a system of two-coordinate linkage and three-coordinate linkage should be selected according to the geometry of the surface. It can also add CNC indexing head or CNC rotary table based on the general CNC milling machine according to the requirements of part processing. At this time, the system of the machine tool is a four-coordinate CNC system, which can process spiral grooves and blade parts.
2.Size
The small-sized lifting desktop CNC milling machine has a table width of less than 400mm, which is most suitable for small and medium-sized parts processing and contour milling tasks of complex shapes. Larger specifications such as gantry-type milling machines, the working table is above 500-600mm, which is used to solve the processing needs of large-sized and complex parts.
3.Accuracy
China has established precision standards for CNC milling machines, of which CNC milling machines have professional standards. The standard stipulates that the positioning accuracy of its linear motion coordinates is 0.04 / 300mm, the repeat positioning accuracy is 0.025mm, and the milling precision is 0.035mm. In fact, the accuracy of machine tools has considerable reserves, which is about 20% smaller than the national standard tolerance. Therefore, from the perspective of precision selection, general CNC milling machines can meet the processing needs of most parts. For parts with high accuracy requirements, you should consider choosing a precision CNC milling machine.
4.Batch
For large quantities, a special milling machine can be used. If it is a small and medium batch and it is often repeated and put into production periodically, then the CNC milling machine is very suitable, because the multi-tool fixtures, programs, etc. prepared in the first batch can be stored and reused. In the long run, a milling machine with a high degree of automation replaces an ordinary milling machine, and the trend of reducing labor and increasing productivity is inevitable.
