CBN Tools SUMIBORON Series ■ General Features In 1977, Sumitomo Electric Hardmetal successfully developed a revolutionary CBN sintered tool - SUMIBORON. The main component in SUMIBORON is Cubic Boron Nitride with a special ceramic binder sintered under super high pressure and temperature. As compared to other conventional tool materials, CBN has higher hardness and excellent heat resistance. With these distinct characteristics, SUMIBORON can perform machining of hardened steel, high hardness cast iron and exotic metals where previously only grinding was done. Furthermore, excellent efficiency and longer tool life can also be achieved from high speed machining of cast irons. ■ Characteristics The sintered CBN tool - SUMIBORON is mainly used for the machining of ferrous metals due to its low chemical reactivity with iron. There are 3 different classifications of CBN grades as follows: ● A) in the chart below shows high CBN content group, where each grain is fused together. Applicable for the machining of high hardness materials like cast iron, heat resistant alloys and carbides. ● B) below shows a group where CBN grains are held together with a special ceramic binder which has a strong binding force. These provide excellent wear resistance and toughness in the machining of hardened steel and cast iron. ● C) below shows SUMIBORON with a special ceramic coating (Coated SUMIBORON). The CBN substrate along with the coating layer exhibit hardness, toughness, heat resistance and oxidation resistance, required by a tool material for excellent cutting performance. ■ Classifications/ Classifications Microstructure Diagram Grade Work Material Applications BN700 Cast lron(FC) Sintered Sintered Alloy Alloy Mainly CBN grains BN7000 Exotic Alloys A) fused together BN7500 Sintered Sintered Alloy Alloy CBN grain Metal binder BNS800 Cast lron(FC) Exotic Alloys BN1000 BN2000 Mainly CBN grains BN350 Hardened Steel L B) held together with a BNX10 binder BNX20 SUMIBORON CBN grain Ceramic binder BNX25 BN500 Cast lron(FC/FCD) Special BNC2010 ceramic coating BNC2020 Sintered CBN body BNC300 Hardened Steel C) with special ceramic BNC100 coating BNC160 BNC200 CBN Layer BNC500 Cast lron(FCD) L2