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WHAT IS POLYCRYSTALLINE CUBIC BORON NITRIDE (CBN)?
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.
RECOMMENDED SPEEDS AND FEEDS FOR:
CARBON BORON NITRIDE
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RULE OF THUMB: |
Use standard carbide guidelines to start and then increase cutting rates. |
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CBN |
SPEED
(SFM)
|
FEED RATE
(IPR)
|
DEPTH OF CUT
(INCH)
|
|
CARBON STEEL
BEARING STEEL
ALLOY STEEL
DIE STEEL
TOOL STEEL
HIGH TINSEL CAST IRON
CHILLED CAST IRON
GREY CAST IRON
POWDERED METAL
INCONEL
RENE 41
RENE 77
INCOLOY
MONEL
STELLITE
COLMONOY
WASPOLOY |
200-500
200-500
200-500
160-350
160-350
200-500
130-260
1000-2600
500-650
500-650
500-650
450-550
750-900
550-650
550-650
550-650
550-650
|
.008 MAX
.008 MAX
.008 MAX
.008 MAX
.008 MAX
.060 MAX
.032 MAX
.020 MAX
.016 MAX
.006 MAX
.006 MAX
.006 MAX
.006 MAX
.006 MAX
.006 MAX
.003 MAX
.003 MAX
|
.020 MAX
.020 MAX
.020 MAX
.020 MAX
.020 MAX
.100 MAX
.100 MAX
.040 MAX
.120 MAX
.125 MAX
.125 MAX
.015 MAX
.125 MAX
.125 MAX
.125 MAX
.125 MAX
060 MAX
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