A CNC machine tool is a machine tool that implements processing operations through computer control and can be divided into multiple categories based on its structure and purpose. Here are some common CNC machine tool categories:

1. CNC milling machine: Used to perform cutting operations on workpieces, usually including vertical and horizontal milling machines.

2. CNC lathe: Used for rotational cutting on the workpiece, mainly used for processing cylindrical and conical parts.

3. High-precision surfaces and shapes of CNC grinders, including surface grinders, cylindrical grinders, etc.

4. CNC EDM machine: Processed by electroerosion method, mainly used for processing hard materials and complex contours.

5. CNC wire EDM machine: Uses electric erosion method for cutting, especially suitable for processing precision parts.

6. CNC punching machine: Used for punching, cutting and forming operations on metal plates.

7. CNC laser cutting machine: Uses laser beam for cutting, suitable for various materials, especially metal and non-metal materials.

8. CNC injection molding machine: used for plastic injection molding and production of plastic products.

9. CNC turning and milling compound machine tool: It combines the functions of a lathe and a milling machine and can complete a variety of processing operations.

10. CNC turning and grinding compound machine tool: It combines the functions of a lathe and a grinder and is suitable for multi-functional processing of rotating parts.

These are some common categories of CNC machine tools. Each machine tool has specific uses and advantages. Choose the appropriate CNC machine type based on different processing needs and material properties.