Spring clamps mostly clamp the carbide end mill used in machining centers. During use, they are in a cantilever state and may gradually fall off during the milling process, resulting in scrapped workpieces. The reason is that the oil film between the inner hole of the tool holder and the outer diameter of the end mill shank causes insufficient clamping force. Therefore, carbide end mill is usually coated with anti-rust oil when they leave the factory.
There is usually a tiny gap between the carbide end mill and the tool holder so that the tool may vibrate during the machining process. The vibration will make the cutting amount of the peripheral edge of the end mill uneven. The cutting expansion will be greater than the initial value, affecting the machining accuracy and the tool's service life. However, when the processed groove width is small, the device can vibrate to obtain the required width by increasing the cutting expansion. In this case, the amplitude of the end mill should be limited to less than 0.02 mm. Otherwise, stable cutting cannot be performed.
Carbide end millare used in CNC milling of workpiece cavities such as molds. When the cutting point is a concave cavity or a deep cavity, the extension length of the end mill needs to be lengthened. If a long-edged end mill is used, due to the large deflection of the tool, it is easy to produce vibration and cause damage to the tool. Therefore, if only the cutting edge close to the end of the tool is required to participate in the cutting in the machining process, it is better to choose a short-edged long-shank end mill with a longer total tool length. When machining workpieces with large-diameter end mills on horizontal CNC machine tools, the deformation caused by the tool's weight is relatively large, and the end-edge cutting is prone to problems, which arise attention.
The choice of the cutting speed of the tungsten carbide end mill cutter mainly depends on the material of the workpiece to be processed; the choice of the feed speed mainly depends on the material of the workpiece and the diameter of the end mill. However, the choice of cutting parameters is affected by many factors, such as the machine tool, tool system, workpiece shape, and clamping method, so the cutting speed and feed rate should be adjusted according to the actual situation. When tool life is the priority factor, the cutting speed and feed rate can be appropriately reduced, and when the chip separation conditions are not good, the cutting speed can be appropriately increased.
The use of forwarding milling is beneficial to prevent damage to the carbide end mill blades and prolong the service life. However, there are two points to note: If you use an ordinary machine tool, you should try to eliminate the gap of the feed mechanism. When the oxide film or other hardened layer formed by the casting and forging process remains on the surface of the workpiece, reverse milling should be used.
Carbide end mill has good wear resistance in high-speed cutting, and the cutting conditions must strictly meet the requirements of the tool.