The drilling, tapping, and tool changing machining center refers to a CNC machining center that has three functions: drilling, milling, and tapping, and has an automatic tool changing function. The following is a general introduction to this type of machining center:

1. CNC machining center: This is a highly automated machine tool that usually has multiple functions such as milling, drilling, and tapping. CNC means processing by computer-controlled machine tools, which can achieve high-precision and high-efficiency processing.

2. Drilling function: Drilling refers to the process of using a drill bit to process holes. The drilling capabilities of CNC machining centers often enable high-speed, precise hole machining in a variety of materials.

3. Tapping function: Tapping refers to the process of forming threads on the workpiece through a tool. The tapping function of the CNC machining center can realize automated thread processing and improve processing efficiency.

4. Milling function: Milling refers to the process of using a milling cutter to process flat or curved surfaces. The milling function of the CNC machining center can complete complex contour machining and surface machining.

5. Automatic tool change function: Automatic tool change is an important function of CNC machining center. It allows different types or specifications of tools to be automatically replaced during the machining process, improving production efficiency and reducing downtime.

This kind of CNC machining center that integrates drilling, tapping and milling functions and has automatic tool changing function is usually used to produce parts that require multiple processes, such as molds, parts and components, etc. Such a machining center not only improves processing accuracy and efficiency, but also reduces the need for manual operations.