A corner radius cutter can be understood as an end mill with a large radius at the junction of the end teeth and the circumferential teeth. Of course, if the radius of this arc is large enough to equal the radius of the cutter, it becomes a ball nose cutter. Therefore, the corner radius cutter is a kind of milling cutter between the end mill and the ball nose milling cutter, and it is also a kind of milling cutter commonly used in profiling machining. From a structural point of view, indexable corner radius milling cutters, indexable corner radius milling cutters with replaceable heads, solid carbide radius milling cutters, and replaceable carbide corner radius milling cutters are all optional, as shown in Figure 5-15.
There are two main forms of indexable corner radius cutters: they are used in corners with round inserts, as shown in Figure 5-15, the first and second from the left, which are called round inserts, and the second is square or rectangular or diamond-shaped inserts with large fillets, as shown in Figure 5-16.
5-15
5-16
There is often a problem with large radius inserts installed on a standard cutter body, which is likely to protrude beyond the large fillet, affecting normal cutting. Therefore, it is necessary to ask the tool dealer or the user to make some small changes to the cutter body to remove the cutter body outside the large fillet of the protruding blade. The recommended removal operation is to make the blade protrude about 0.5mm from the cutter body, and pay attention to removing the burrs from the blade groove and the modified fillet part of the cutter body to prevent poor positioning of the blade when it is installed. One of the more widely used indexable corner radius cutters is the round insert cutter. This milling cutter is not only widely used in mold manufacturing, but also widely used in blade processing in steam turbines and other industries.
The blades are often made of high-temperature resistant alloys, and the cutting force is relatively large. This cutting force often creates a torque on the insert that is likely to cause the insert to rotate slightly and cause the insert to break. As a result, many round insert milling cutters are now considering measures to prevent the blade from turning.
