2. CNC CUTTING TOOL MATERIALS (1)UNCOATED HARD METALS (ISO GROUP HW) (2) COATED HARD METALS ( ISO GROUP HC ) (3) CEMENTS ( ISO GROUP HT ) (4) CEREMIC CUTTING MATERIALS ( ISO GROUP C ) (5) POLYCRYSTALLINE CUTTING MATERIALS (6) CUBIC BORON NITRIDE ( ISO GROUP BN ) (7) POLYCRYSTALLINE DIAMOND ( ISO GROUP DP ) (8) CUTTING MATERIAL CHART 27

3. CNC CUTTING TOOL MATERIALS 1)UNCOTED HARD METALS (ISO GROUP HW) The conventional uncoated hard metals comprise a variety of mature grades. They are still employed frequently in milling but to a relatively small extent in turning and drilling. Their applications mainly include operations involving light cuts requiring sharp cutting edges and operations demanding very high toughness. Uncoated hard metal grades are also used on non-ferrous metals and nonmetallic materials.

4. 2) COATED HARD METALS (ISO GROUP HC) Highest wear resistance and good toughness can be combined by appropriate coating techniques. The preferred process is chemical vapour deposition, in the CVD process extremely hard, thin layers of coating material (e.g. TIC,TINA 1 2O 3 ) are deposited on tougher hard metal substracts of temperatures of around 1000 degree centigrade. 3) CEMENTS (ISO GROUP HT) Cements are hard metals based on titanium carbonitride (TIC,TIN) with a Cobalt/Nickel binder. They display high strength at elevated temperatures and great resistance to oxidation. They offer outstanding cutting edge strength and are particularly suitable for finishing operations of high cutting speeds, producing excellent surface finish.

5. 4) CEREMIC CUTTING MATERIALS (ISO GROUP C) Ceramic cutting materials display good hot hardness and high compressive strength at elevated temperatures, permitting very high cutting speeds. Their main application is the turning of grey cost iron, in which the tougher nitride ceramics have generally found greater acceptance than the more wear resistant oxide or dispersion ceramics 5) POLYCRYSTALLINE CUTTING MATERIALS These include polycrystalline cubic boron nitride (CBN) and polycrystaline diamond (PCB). Both materials are produced by high temperature/high pressure synthesis. Their applications are limited and they are mainly seen as complementing hard metals in specialized applications.

6. 6) CUBIC BORON NITRIDE (ISO GROUP BN ) Cubic boron nitride (CBN) the hardest cutting material after diamond, possesses great wear resistance, even at cutting edge temperatures over 1000 degree centigrade. Used on hardened materials chilled cast iron and high temperature NI/CO alloys. 7) POLYCRYSTALLINE DIAMOND (ISO GROUP DP) In contrast to monocrystaline diamond polycrystaline diamond is completely isotropic and thus less susceptible to breakage. It is fine grain structure makes it possible to produce very at very high cutting speed. Excellent surface finishes. Further applications include fibre reinforced plastics.

7. CUTTING TOOLS FOR CNC MILLING CUTTING PARAMETERS TOOLS PATTERNS FACTORS AFFECTING MILL PARTS SELECTION OF TOOLS

8. ISO CUTTING TOOLS