Flat end mill are the most commonly used milling cutters on CNC machine tools. There are cutters on the cylindrical surface and end surface of the end mills. They can cut at the same time or separately. Mainly used for plane milling, groove milling, step face milling and profile milling.
Flat end mill can be used for face milling. But because its entering angle is 90°, the tool force is mainly radial force in addition to the main cutting force, which is easy to cause the tool bar to flex and deform, and it is also easy to cause vibration and affect the processing efficiency. Therefore, it is similar to the thin-bottomed work piece. Except for special reasons such as the need for small axial force or occasional reduction of tool inventory for face milling, it is not recommended to use Flat end mill to machine flat surfaces without steps.
Most of the Flat End Mill used in machining centers adopt the spring clamp set clamping method, which is in a cantilever state when in 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.
Flat end mill 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 installed, the shank of the end mill and the inner hole of the tool holder should be cleaned with a cleaning fluid, and then the installation should be carried out after drying.
When the diameter of the end mill is large, even if the tool holder and the tool holder are clean, a tool drop accident may still occur. At this time, a tool holder with a flat notch and a corresponding side locking method should be used.
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 the tool holder has been used for too long and the tool holder port has worn out into a tapered shape. Should be replaced with a new tool holder.
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Post time: Dec-09-2021
