19/02/2009
CERATIZIT successfully applies CBN with HyperCoat coating
Tool life increased between 30 and 40 % compared to uncoated CBN |
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With the HyperCoat grade CTL3215 CERATIZIT will for the first time present a coated CBN (cubic boron nitride) material. Thanks to CERATIZIT’s coating approach the application range of CBN tools has been substantially extended. At last it is now possible to mill also hardened steel and cast iron in a notably better way. The coated CBN solution from CERATIZIT will mainly be applied for fine or medium milling operations with cutting speeds up to 1,000 metres per minute, depending on the application. The tooling solution therefore requires stable machining conditions and is applied without cooling lubricant. Tool life compared to uncoated CBN is increased between 30 and 40 %.
CERATIZIT supplies the most important producer of CBN materials with the tools necessary for high-pressure synthesis (anvils and dies). Furthermore CERATIZIT has been selling CBN inserts for many years, and to an increasing degree also tools for milling applications.
The stress the tools are subjected to during these milling operations is caused by interrupted cut, thermal shock and oxidation, and represents one of the threshold applications of CBN. The carbide expert CERATIZIT has faced this problem by providing CBN with the functional HyperCoat coating and using it for milling applications, which considerably enhances both process security and tool life. In addition it has become clear that these improvements are also achieved in turning applications under difficult conditions, such as the machining of grey cast iron and chilled castings.
HyperCoat coating is the secret
CERATIZIT has developed and patented a specific PVD coating for CBN cutting materials. This innovative coating is the answer to the complex demands on a material applied in milling operations which are characterized by stress variation, thermal shock and oxidation. The recently developed coating is based on an innovative composition which shows significantly better resistance to oxidation and simultaneously excellent wear resistance, especially when it comes to high application temperatures. Compressive stress resulting from the PVD coating procedure provides the new HyperCoat coating with higher toughness and last but not least with more reliability for the tooling system.
Cutting material with success story
CBN has been known as a cutting material for almost 40 years. In 1969 GE (General Electric) launched cubic boron nitride for the first time under the name 'Borazon’ as a revolutionary development in the field of extremely hard grinding materials. CBN does not occur naturally, but is produced synthetically (high-pressure synthesis) and, with a hardness twice as high as silicon carbide (SiC) after diamond ranks as the second hardest material. It shows its strengths particularly when turning hard materials (hardness > 58 HRC), such as hardened steel or chilled castings: CBN is characterized by extreme hardness and excellent heat resistance as well as sufficient toughness for this application area.
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