CNC machining center is an automatic machine tool composed of mechanical equipment and CNC system, which is suitable for machining complex parts. After the workpiece is clamped at one time, it can complete plenty of processing contents, and batch workpieces with high processing precision and medium processing difficulty. 

The processing steps of CNC machining center are mainly reflected in the following aspects:

1. Determine the machining base surface, datum hole, machining allowance, etc. of the parts. When determining the process content completed by one-time clamping, the accuracy requirements and heat treatment requirements of parts shall be considered. For some complex parts, due to thermal deformation, internal stress, part clamping deformation and other reasons, they can be clamped for another time or more to complete the processing.

2. The machining sequence shall follow the principle of "from rough to fine", that is, heavy cutting and rough machining shall be carried out first, but most of the machining allowance on the blank part shall be removed, and then the machining process with low calorific value and low machining requirements shall be arranged to allow sufficient time for cooling before finishing, and then finish machining. Each process shall minimize the amount of empty stroke movement and reduce the number of tool exchange. The recommended machining sequence is: milling large plane - rough boring, precision boring - end milling cutter machining - centering, drilling, threading, hole and surface finishing.

Because the machining center has good rigidity and high power, larger cutting volume should be selected as much as possible in the machining process, which can save machining hours, improving work efficiency.