Improved notch resistance of the insert cutting

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Unformatted text preview: l carbide inserts in nickel-based materials. • added benefit of the toughness of the SiC whiskers to make this category of ceramic available for machining harder materials with interruptions. Major Classes of Tool Materials 7. Polycrystalline Tools 7. Fabricated by compacting small particles of diamond or polycrystalline diamond (PCD) under high pressure and temperature. Polycrystalline tool materials are more homogeneous, with improved strength and durability, but with slightly reduced hardness compared to natural diamond. PCD is less expensive than diamond, but over 20 times more costly than carbide. However, it has up to 50 times longer tool life than carbide. Major Classes of Tool Materials 8. Cubic Boron Nitride 8. Its hardness is 2nd to diamond and has high wear resistance. Used for machining high temperature and hardened ferrous alloys Available in solid CBN and as CBN-tipped tools (on carbide substrate) Can cost 20 times that of carbide. Major Classes of Tool Materials 9. Diamond Tools Diamond tools have diamond grains suitably fixed on the cutting parts of the tool by a bonding material or another method. For machining precision parts and non-ferrous alloys (Al) and non-metallic materials (fibre glass and composites) Not suitable - for machining carbon steel. Diamonds can react with Fe, Co, Ni, Cr, V under the high temperatures generated in the machining processes. Hence, diamond tools are not suitable to machine steels, including common steels and various tough alloy steels. Single crystal diamond cutting tool Single...
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