1. The top-to-precision CNC machining cannot affect the positioning and clamping of the bottom-to-process, and the general machine tool processing process interspersed in the middle should also be considered comprehensively.
2. The processing of complex precision parts is performed with the inner shape and inner cavity processing process, and then the outer shape processing process is carried out.
3. Use the same positioning, clamping method or the same tool cnc machining process to reduce the number of repeated positioning, the number of tool changes and the number of times of moving the platen.
4. For multiple processes carried out in the same part installation, the processing process with little damage to the rigidity of the workpiece should be arranged first.
In the precision CNC machining process sequence, in order to ensure the machining quality, the machining process is divided into two types: finishing and finishing:
1. Selecting the tool centralized sorting method is to divide the process according to the tools used, and use the same tool cnc to process all the parts that can be completed. Use a second knife and a third to do whatever else they can. This can reduce the number of tool changes, compress the idle time, and reduce unnecessary positioning errors.
2. For complex precision parts, there are many steps for cnc processing, and the processing part can be divided into several parts according to their structural characteristics, such as inner shape, outer shape, curved surface or plane, etc. Generally, the plane and positioning surface are processed first, and then the hole is processed; the simple geometric shape is processed first, and then the complex geometric shape is processed; the parts with lower precision are processed first, and then the parts with higher precision are processed. Layered processing is effective to ensure quality and improve production efficiency!
3. For the parts that are prone to cnc machining deformation by the rough and fine cnc machining sequence method, due to the possible deformation after rough machining, the shape needs to be corrected. separate. To sum up, when dividing the process, we must flexibly grasp the structure and craftsmanship of the parts, the function of the machine tool, the number of CNC machining contents of precision parts, the number of installations and the production organization of the unit. It is also recommended to adopt the principle of process concentration or the principle of process dispersion, which should be determined according to the actual situation, but must be selected reasonably.