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  Machining Hard Steel

   What is POLYCRYSTALLINE CUBIC BORON NITRIDE?

 

    Diamond, cubic carbon, is the hardest, most abrasive resistant material known to man. It is therefore
    an ideal tool material. Unfortunately, in the presence of heat and iron, nickel or cobalt, diamond     transforms to hexagonal form, graphite. This is why ferrous materials are not generally machined
    with diamond.
    The second hardest material, Cubic Boron Nitride (CBN), is created by man, using temperatures and     pressures similar to those for diamond synthesis, but does not have this inherrant weakness when it
    comes to the machining of ferrous materials. Used in the correct manner CBN offers cost-effective
    rapid stock removal and finishing of hardened steels and certain softer ferrous materials.

   David Richards offer five grades of PCBN material:-

 

    DR-100 For Rough Machining:
 
    is a fully solid high CBN content material and is used for heavy
   machining applications,where high stock removal rates provide an
   attractive alternative to conventional techniques.

 

 

   DR-80 and DR-85 For Special Tools & Semi Finishing:

     materials with a high CBN content and a tungsten carbide
   substrate. These are used for roughing applications,where the
   fully solid format of DR-100 is not suitable or semi-finishing
   applications where increased fracture toughness is required.

 

 

  DR-50 and DR- 450 For Finishing:

   DR-50 has a low CBN content and is designed for finishing and
   semi-finishing applications where grinding with conventional
   abrasives proves time consuming or difficult. DR-450 is tougher
   and performs well over severe interruptions.

 

 

 

 

 

David Richards Engineering  2013