The edge of all kinds of cuttings is the most difficult part of the working conditions. The strength of edge is poor,
the heat dissipation is bad; However, the cutting force and cutting heat are more concentrated, and the cutting
speed of CBN cutting tools edge is the highest place when machining, it is easy to be worn off, therefore, the durability
of the CBN inserts depends on the wear condition of edge directly.
The edge of CBN turning inserts affects the machining surface formation and the height of the residual area directly.
That is to say, the edge has direct influence on the roughness of machined surface. Due to the above reasons, when
choosing appropriate shape of edge and parameters, considering the tool life and surface quality required based on
specific processing conditions. Corner radius is the main parameter of the shape of inserts, which directly affects
the surface roughness, the shape of cutting layer, the cutting temperature and tool life.
Big Corner Radius Advantages:
Excellent strength of cutting edge, suitable for rough cutting;
Heat dissipation of cutting edge is good, and the tool life is long;
Could improve surface roughness under the condition of constant cutting parameters.
Big Corner Radius Disadvantages:
Radial force is large when cutting;
Require the machine with good rigidity.
Small Corner Radius Advantages:
Suitable for small cutting depth finishing or ultra-precision machining,
The radial cutting force is small when machining the slender shaft.
Small Corner Radius Disadvantages:
The strength of cutting edge and shock-resistance is weak .
Heat dissipation of cutting edge is not good.
Request change cutting parameters to improve surface roughness Ra.
The relationship between corner radius and cutting depth affects the vibration tendency; Usually choose the corner
radius smaller than the cutting depth, which could reduce the vibration tendency.