CNC machine tool, referred to as CNC machine tool, is a highly automated processing equipment. It integrates technologies from multiple fields such as computers, electrical, machinery, etc., and can complete the processing of various complex parts with high efficiency and high precision. The structure of CNC machine tools can be divided into the following parts:

1. Host part: The host is the main body of the CNC machine tool, which includes the bed, workbench, spindle, feed system and other components. The bed and worktable are used to install and fix the workpiece, the spindle is used to drive the tool to rotate, and the feed system controls the feed speed and direction of the tool.

2. CNC system: CNC system is the "brain" of CNC machine tools. It consists of computer hardware, CNC software, etc. The CNC system accepts the input processing information, processes and calculates the data, issues control instructions, and drives the servo system and actuator to complete the processing.

3. Servo system: The servo system is an important part of CNC machine tools. It consists of servo motor, servo driver, position detector, etc. The servo system drives the movement of the workbench or spindle according to the control instructions of the CNC system, and ensures the accuracy and stability of its movement.

4. Auxiliary devices: Auxiliary devices are other devices in CNC machine tools besides the host machine and CNC system, including cooling systems, chip removal devices, protective devices, etc. The function of these devices is to ensure the normal operation and operational safety of CNC machine tools.

In general, the structure of CNC machine tools is quite complex, and each part has its own unique role and importance. Only when all parts work together can the efficient and high-precision processing of CNC machine tools be achieved.