SUMIBORON® CBN
■ General Features Sintered CBN - SUMIBORON ® , which has CBN (cubic boron nitride) is a hard material second only to diamond - as its main component. CBN is sintered with a special ceramic binder under ultra-high pressure and temperature. CBN - SUMIBORON ® has high hardness, excellent thermal resistance and excellent properties including being unreactive to ferrous metals, enabling exotic alloys, hardened steel or hard cast iron to be machined. Excellent efficiency and longer tool life can also be achieved from high-speed finishing of cast iron. Sumitomo's CBN - SUMIBORON ® was first successfully developed in Japan by our company in 1977. Coated CBN - SUMIBORON ® with a special ceramic coating, and binderless CBN made by directly bonding CBN particles without a binder are new additions to our product lineup.
L
Sintered CBN - SUMIBORON ® is mainly used for the machining of ferrous metals due to its low chemical reactivity with iron. There are 4 different classifications of CBN -SUMIBORON ® as follows:
■ Features
■ Classifications / Applications
Classifications
Structure
Diagram
Grade
Work Material
BN7125 BN7000 BN700 BN7115 BN7500
K (FC) Sintered
Alloy S
Sintered Alloy
With a high CBN content, where each grain is fused together, this group can be used for the machining of high-hardness materials like cast iron, heat-resistant alloys and sintered alloys.
Sintered Alloy BNS8125 K (FC/FCD) S
CBN grain Metal binder
(A)
Special ceramic coating
BNC8115 K (FC/FCD) S H
CBN
BN1000 BN2000 BN350 BNX10 BNX20 BN500 BNC2105 BNC2115 BNC2125 BNC2010 BNC2020 BNC300 BNC100 BNC160 BNC200 BNC500
CBN grains are held together by a special ceramic binder with a strong binding force provides excellent wear resistance and toughness in the machining of hardened steel and cast iron.
H
(B)
CBN grain
K (FC/FCD)
Ceramic binder
Special ceramic coating
SUMIBORON with special ceramic coating. The CBN and coating exhibit the hardness, toughness, thermal resistance and oxidation resistance that tool material requires for excellent cutting performance. Containing no binder but a structure of directly bonded nano- to sub-micron CBN particles which provides excellent hardness and thermal conductivity, making them highly efficient with long tool life when machining exotic alloys such as titanium alloys and cobalt-chrome alloys.
H
(C)
CBN
K (FCD)
NCB100
K (FC) S Cemented Carbide
Hard Brittle Material
(D)
CBN grain (no binder)
500nm
L2
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