Milling characteristics of flat milling cutters 1. High productivity milling involves continuous rotation of the milling cutter and allows for higher milling speeds, resulting in higher productivity. During continuous cutting milling, each tooth is continuously cutting, especially in end milling, where the milling force fluctuates greatly, making vibration inevitable. When the frequency of vibration is the same or multiple of the natural frequency of the machine tool, the vibration is the most severe. In addition, when high-speed milling, the cutter teeth are subject to periodic thermal and cold shocks, which are prone to cracks and edge chipping, reducing the tool durability. 3. Multi blade multi edge cutting milling cutters have multiple teeth and a large total length of cutting edges, which is beneficial for improving tool durability and productivity, and have many advantages. But there are also two problems: firstly, the cutter teeth are prone to radial runout, which will cause uneven load and wear on the cutter teeth, affecting the quality of the processed surface; The second is that the chip holding space of the cutter teeth must be sufficient, otherwise it will damage the cutter teeth. 4. Different milling methods can be used to improve the durability and productivity of the cutting tool according to different processing conditions, such as reverse milling, forward milling, symmetrical milling, asymmetric milling, etc.