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.
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■ Features
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: ● Table (A) below shows the group with a high CBN content, where each grain is fused together. This group can be used for the machining of abrasive materials like cast iron, heat-resistant alloys and powdered metals. ● Table (B) shows the group where CBN grains are held together by a special ceramic binder with a strong binding force. These provide excellent wear resistance and toughness in the machining of hardened steel and cast iron. ● Table (C) below shows CBN - SUMIBORON ® with a special ceramic coating. The CBN and coating layer exhibit the hardness, toughness, thermal resistance and oxidation resistance requird for optimal cutting performance. ● Table (D) shows a product containing no binder; its structure of directly bonded nano or to sub- micron CBN particles provides excellent hardness and thermal conductivity, making it highly efficient with a long tool life when machining exotic alloys such as titanium alloys and cobalt-chrome alloys.
■ Classifications / Applications
Classifications
Structure
Diagram
Grade
Part Material
BN700 BN7000 BN7500 BNS800 BN1000 BN2000 BN350 BNX10 BNX20 BNX25 BN500 BNC2010 BNC2020 BNC300 BNC100 BNC160 BNC200 BNC500
K Cast Iron (FC) Sintered
Alloy Powdered Metal
S Exotic Alloy
Mainly CBN grains fused together
(A)
Sintered Alloy Powdered Metal
K Cast Iron (FC) S Exotic Alloy
CBN grain Metal binder
Mainly CBN grains fused together with a binder
H Hardened Steel
(B)
CBN grain
Ceramic binder
K Cast Iron (FC/FCD)
Special ceramic coating
Sintered CBN body with special ceramic coating
H Hardened Steel
(C)
K Cast Iron (FCD)
CBN
K Cast Iron (FC) S Exotic Alloy
CBN particles only are bonded strongly
NCB100
(D)
Carbide Carbides
Hard Brittle Material Hard Brittle Materials
500nm
L2
CBN particles (no binder)
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