Most of the end mills used in machining centers adopt the spring clamp set clamping method, and they are in a cantilever state during use. During the milling process, sometimes the end mill may gradually protrude from the tool holder, or even fall completely, causing the workpiece to be scrapped. The reason is generally between the inner hole of the tool holder and the outer diameter of the end mill holder. There is an oil film, resulting in insufficient clamping force. End mills are usually coated with anti-rust oil when they leave the factory. If non-water-soluble cutting oil is used during cutting, a misty oil film will also be attached to the inner hole of the tool holder. When there is an oil film on both the tool holder and the tool holder, the tool holder It is difficult to clamp the tool holder firmly, and the end mill is easy to loosen and fall during processing. Therefore, before the end mill is clamped, the tool holder bit for the end mill and the inner hole of the tool holder should be cleaned with cleaning fluid, and then clamped after drying.
When the diameter of the end mill is large, even if the tool holder bit and the tool holder are clean, a tool drop accident may still occur. At this time, the tool holder with flattened notch and the corresponding side locking method should be selected.
Another problem that may occur after the end mill is clamped is that the end mill is broken at the tool holder port during processing. The reason is generally because that the tool holder has been used for too long, and the tool holder port has been worn into a tapered shape. Should be replaced with a new tool holder.
