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ULTRA HARD TOOLS

Tools with an ultra hard cutting edge based on various kinds of diamond and cubic boron nitride (CBN) enable the application of completely new cutting strategies which manifest themselves with:

  • productivity increase of machining,
  • result quality improvement of the workpiece surface,
  • major decreasing the final number of machining operations,
  • enormous durability.

Ultra hard cutting materials Rotana can be divided into two main groups regarding their chemical composition, resulting hardness and chemical affinity of machined materials.

„These progressive cutting materials are difficult to machine using common conventional technologies. Thanks to implementation of the most advanced technologies, the company Rotana a.s. has facilities which enables effective processing of these advanced materials.“

MATERIALS BASED ON DIAMOND

can be divided into monocrystalline and polycrystalline materials. Polycrystalline materials are further divided into PKD and CVD-D on the bases of structural links.

Polycrystalline diamonds PKD are created by fusion sintering of the diamond powder with a suitable binder, most often based on cobalt CO, on a supporting carrier of solid carbide. Therefore, it is a heterogeneous mixture. Thickness of the diamond layer ranges from 0.5 to 1.5 millimetre.

„The application of these advanced materials are suitable for high speed cutting (HSC).“

CVD-D (Chemical Vapour Deposition of Diamond) diamonds are created by vapour condensation on a suitable base. The mixture of hydrogen with methane is bombarded with charged particles or directly with plasma. The subsequent chemical reaction will cause “rain“ of carbons falling on the base where they become hard in the form of diamond. Thickness of the diamond layer ranges from 0.8 to 1.2 millimetre. It is a hi-tech cutting material which does not contain any external binder. This parameter influences microgeometry of the cutting edge which will show enormous durability of the cutting tool, but also the resulting quality of machined areas.

These advanced materials are suitable to use for machining nonferrous metals and their alloys (Al, Cr, Zn, Mg, Ag) and non-metallic materials (plastics, glass laminates, graphite, composite materials).

The application of diamond tools is limited depending on the chemical affinity between the tool and the material of workpiece (diffusion of carbon from the crystalographical grid of diamond to the material of workpiece). The alloys containing iron, cobalt, manganese, nickel, chrome and platinum are not suitable for applying tools with the diamond cutting edge. Further, carbide-forming elements, (wolfram, tantalum, titan, zirconium, etc.) react with diamond at high temperatures to form relevant carbides.

MATERIALS ON THE BASE OF CUBIC BORON NITRIDE (CBN)

Polycrystalline cubic boron nitride PCBN is a highly effective cutting material which is fusion-sintering of cubic boron nitride with a suitable binder, mostly base on aluminium Al.

Cubic boron nitride CBN is a fully synthetic material which is, after diamond, the hardest known substance. Due to the chemical inactivity to iron metals, it is determined for machining this group of materials.

  • Hardened steel (45HRC-65HRC)
  • Heat resistant materials
  • Grey and hardened cast irons
  • Materials difficult to machine based on cobalt and nickel
  • Highly abrasive materials..

 

Further information about new technologies here.

Rotana a.s.
Průmyslová 2085
59401 Velké Meziříčí

tel.: +420 566 521 948
fax: +420 566 522 057

mobil: +420 733 347 270
email: rotana@rotana.cz

 

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