Hitachi Tools is a cBN ball end mill with sharpness and rigidity

Hitachi Tools (Headquarters: Tokyo) is targeting the finishing of high-hardness materials, and has launched the cBN (cubic boron nitride) ball end mill "EPOCH CBN ball end mill" (Fig. 1). By carefully designing the shape of the cutter head, the weak point of cBN easy to break is improved, and the same sharpness as the superhard cutter is achieved. There are 10 types of cutter head radius (R) of 0.1 to 1 mm, and the price is 29925 to 35,700 yen.
  Figure 1: "EPOCH CBN Ball End Mill" with both rigidity and sharpness   The new product has an S-shape in the shape of the R cutting edge (Fig. 2). In this way, the same front angle as the super-hard end mill is formed, and the cutting resistance is reduced by 45% compared to other companies' cBN ball end mills. At the same time, rigidity is ensured by forming the undercut surface from the two faces.   Figure 2: The shape of the blade
  Tests conducted by the company showed that when the HRC (Rockwell C scale) of 60 was processed, the finished surface roughness (Rz) was 1.5 μm. The machining shape error is 0.001 mm for 1 m machining, 0.004 mm for 100 m machining, and 0.005 mm for 200 m machining, maintaining accuracy.  
 

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