Cutting Tools with Design

Cutting Tools with Design - Cutting Tools Chapter 21...

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    Cutting Tools Chapter 21
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    Cutting Tools Cutting tool – Most critical part of  machining system Tool Temperature: 1000 C° High Local Stresses Severe Friction
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    Tool Characteristics   High Hardness Resistant to abrasion, wear, chipping High Toughness (impact resistance) High hot hardness Strength to resist bulk deformation Good chemical stability Adequate thermal properties High elastic modulus (stiffness) Consistent tool life Correct geometry and surface finish
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    Common Abbreviations  TiC – Titanium Carbide TiN – Titanium Nitride Al 3 O 2  – Aluminum Oxide WC – Tungsten Carbide TiCN – Titanium Carbonitride
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    Tool Material Hardness
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    Tool Steel  Hardened, tempered low carbon steel Low Hardness Loss of hardness, T>400 F° Used for low speed applications 
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    High Speed Steel Developed 1900 Steel alloy with tungsten, chromium,  vanadium, molybdenum, cobalt Retains hardness to 1100°F  (590°C) Operate at 2 to 3 times cutting speed of tool  steel with equal tool life
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    High Speed Steel Fabricated by: Wrought Casting HIP; Hot isostatic pressing Applications Files, saws, drills, taps Broaches Mill cutters Low speed, low volume, complex profiles
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    Cast Cobalt Alloys Alloy, may contain chromium, tungsten,  niobium, in a cobalt matrix Cast in graphite chill molds Fine-grained, hard surface complex  carbides Surface hardness, Rc 60-65 Anneal at 1500°F (815° C)
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Cutting Tools with Design - Cutting Tools Chapter 21...

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