In recent years, with the continuous development of CNC machine tools, there are more and more types of CNC machine tools, and their division is becoming increasingly detailed. However, no matter how the style changes, overall, CNC machining tools must adapt to the characteristics of high-speed, efficient, and high automation of CNC machine tools. Among CNC tools, CNC milling cutters are the most widely used. Now, the types of CNC milling cutters are summarized as follows. 1、 Classification of CNC milling cutters （1） According to the materials used for manufacturing milling cutters, they can be divided into 1。 High speed steel cutting tools; 2。 Hard alloy cutting tools; 3。 Diamond cutting tools; 4。 Other material tools, such as cubic boron nitride tools, ceramic tools, etc. （2） According to the different structural forms of milling cutters, they can be divided into 1. Integrated: The tool and handle are made into a whole. 2. Inlay type: can be divided into welding type and machine clamp type. 3. When the ratio of the working arm length to diameter of the cutting tool is large, this type of tool is often used to reduce tool vibration and improve machining accuracy. 4. Internally cooled: cutting fluid is sprayed onto the cutting edge of the tool through the nozzle hole inside the tool body; 5. Special types: such as composite cutting tools, reversible threading tools, etc. （3） According to the different structural forms of milling cutters, they can be divided into 1. Face milling cutter (also known as end milling cutter): The face milling cutter has cutting edges on both the circumferential surface and end face, and the end cutting edge is a secondary cutting edge. Face milling cutters are often made into sleeve type gear insert structures and blade machine clamp indexable structures. The cutting teeth are made of high-speed steel or hard alloy, and the cutting body is 40CR. Drilling tools, including drills, reamers, taps, etc; 2. Mold milling cutter: Mold milling cutter is developed from end milling cutter and can be divided into three types: conical end milling cutter, cylindrical ball end milling cutter, and conical ball end milling cutter. Its shank has a straight shank, a flattened straight shank, and a Morse taper shank. Its structural feature is that the ball head or end face is covered with cutting edges, and the circumferential edge is connected to the arc of the ball head edge, which can be used for radial and axial feed. The working part of the milling cutter is made of high-speed steel or hard alloy. Aluminum plate spot welding machine 3. Keyway milling cutter: used for milling keyways. 4. Forming milling cutter: The cutting edge is consistent with the shape of the surface to be machined. 2、 Common CNC milling cutters Please explain the application scenarios of several commonly used milling cutter types. （1） Single edge milling cutter This cutting tool has high processing efficiency and uses high-quality hard alloy as the cutting body. Generally, it adopts sharp edge grinding technology and high capacity chip removal, which makes the tool non stick chips, low heat generation, and high smoothness in high-speed cutting. It is widely used in industries such as handicrafts, electronics, advertising, decoration, and wood processing, suitable for factory batch processing and high demand products. （2） Two edge end mills and four edge end mills This type of tool generally adopts an overall alloy structure, which is characterized by strong stability. The tool can work stably on the machining surface, effectively ensuring the machining quality. Suitable for a wide range of materials, such as carbon steel, mold steel, alloy steel, tool steel, stainless steel, titanium alloy, cast iron, suitable for general mold and mechanical parts processing. （3） Thread milling cutter With the development of CNC machine tools in China, thread milling cutters are increasingly recognized by people. Their excellent processing performance has become a powerful tool for reducing thread processing costs, improving efficiency, and solving thread processing problems. Due to the current manufacturing material of thread milling cutters being hard alloys, the processing speed can reach 80-200M/MIN, while the processing speed of high-speed steel wire cones is only 10-30M/MIN, thread milling cutters are suitable for high-speed cutting, and the surface finish of thread processing is also greatly improved. The thread machining of high hardness materials and high-temperature alloy materials, such as titanium alloy and nickel based alloy, has always been a relatively difficult problem, mainly because high-speed steel wire taps have a shorter tool life when machining the threads of these materials. However, using a hard alloy thread milling cutter for machining hard material threads is an ideal solution. The machinability hardness is HRC58-62. For thread processing of high-temperature alloy materials, thread milling cutters also exhibit excellent machining performance and unexpected long lifespan. For threaded holes with the same pitch and different diameters, using a tap machining requires multiple cutting tools to complete. However, if using a thread milling cutter for machining, using one cutting tool is sufficient. After the tap is worn or the processed thread size is less than the tolerance, it cannot be used anymore and can only be scrapped; When the thread milling cutter is worn and the size of the processed thread hole is less than the tolerance, necessary tool radius compensation adjustments can be made through the CNC system to continue processing qualified threads. Similarly, in order to obtain high-precision threaded holes, using a thread milling cutter to adjust the tool radius is much easier than producing high-precision taps. For small diameter thread processing, especially for high hardness and high-temperature materials, the tap may sometimes break, block the threaded hole, and even cause parts to be scrapped; Using a thread milling cutter, due to the smaller diameter of the tool compared to the processed hole, even if it is broken, it will not block the threaded hole, making it very easy to remove and will not cause parts to be scrapped; By using thread milling, the cutting force of the cutting tool is significantly reduced compared to the tap, which is particularly important for machining large diameter threads. This solves the problem of the machine tool being overloaded and unable to drive the tap for normal machining. Thread milling cutter, as a tool for machining threads using CNC machine tools, has become a widely used practical tool type. There are various types of CNC milling cutters, and with the increasing development of the CNC industry, the types, application conditions, and occasions of CNC milling cutters will inevitably change. We still need to continue to pay attention to and study their dynamics, which is of great practical significance.