Transcript REASONS FOR DEVELOPMENT OF CUTTING TOOL
REASONS FOR DEVELOPMENT OF CUTTING TOOL
GLOBLE COMPETATION
PRODUCTIVITY :
Cutting Speed Reduce Machining Time Improve Tool Life
QUALITY AND RELIABILITY:
High accuracy & tolerances Better surface finish
Cost:
Reduce Unnecessary Cost Reduce non-productive cost
REASONS FOR DEVELOPMENT OF CUTTING TOOL
BASIC REQUIREMENT OF A TOOL MATERIALS
HOT HARDNESS WEAR RESISTANCE TOUGHNESS AND STRENGTH THERMAL CONDUCTIVITY CO-EFFICIENT OF FRICTION CO-EFFICIENT OF THERMAL EXPANSION MACHINIBILITY AND GRINDABILITY
CUTTING TOOL MATERIALS
HOT HARDNESS OF SEVERAL TYPES OF TOOLS:
TYPES OF CUTTING TOOL MATERIALS
CONVENTIONAL CUTTING TOOL MATERIALS
High Carbon Steel High Speed Steel Cast-Cobalt alloys (Satellite) Cemented Carbide Ceramics CERMET Diomond
TYPES OF CUTTING TOOL MATERIALS
ADVANCE CUTTING TOOL MATERIALS
Coated Carbides CBN PCD UCON Multi Coated Super Coated Alloy
CUTTING TOOL MATERIALS
HIGH CARBON STEEL
Carbon percentage -0.8 to 1.5% Oldest known tool material Low Hot Hardness Maximum Cutting Speed – 10 m/min Maximum Temperature Limit -250 ºC Suitable for Low Cutting Low Cost Used for taps, dies, hacksaw blades, hand drills, wood working tools etc.
CUTTING TOOL MATERIALS
HIGH SPEED STEEL (H.S.S)
T-Series (Tungsten Type) 18 - 4 - 1- 0.75
W Cr Va C Cutting speed up to 30 m/min Maximum Limiting Temperature 560ºC M-Series (Molybdenum Type) 6 – 6 – 4 - 2 W M Cr Va Less Costly Excellent toughness Widely used in industries as a solid Tool like form tool, drill, milling cutters, endmill, reamers, Broach, Single point cutting tool etc.
CUTTING TOOL MATERIALS
CAST COBALT ALLOYS (STALLITE):
48-53% 30-33% 10-20% 1.5-2.0% Co Cr W C Manufacturing Process- Casting Hot hardness- 760ºC Cutting Speed -45 m/min Higher tool life compare to H.S.S.
Hardness -58 to 64 HRC Lower toughness/brittle Limited strength Used for from tool, Machining cast and malleable iron.
CUTTING TOOL MATERIALS
CERAMICS:
Al 2 O 3 + MgO, Cr 2 O 3 , SiC, TiO, TiC 90% ________10%____________ High abrasive of wear Resistance Less tendency to weld to metal Very high compressive strength Very high hot hardness High refractoriness – 1800 ºC High Cutting Speed -200 to 400 m/min Longer tool life Used for cutting steel and HSS Used for high speed machining
Limitation:
Poor Toughness
fail)
Unreliable (Sudden High rigidity of set up
CUTTING TOOL MATERIALS
CEMENTED CARBIDES (TUNGUSTAN CARBIDE): Plain Tungsten Carbide
94% 6% BINDER Manufactured by Powder Metallurgy Grain size – 1 micron to 8 micron % of Co -3 to 12% Many verity can be produced by controlling grain size and % of cobalt.
Drawback is its Affinity with steel
W C Co Machining of non-ferrous, non-metallic and C.I
CUTTING TOOL MATERIALS
CEMENTED CARBIDES (TUNGUSTAN CARBIDE): Steel Grade (Triple) Tungsten Carbide
W TiC TaC Co 15% 10%
Drawback is its Affinity with steel
High hardness and wear resistance Maximum limiting Temperature -1200 ºC Various Shapes Of Inserts Cutting Speed -100 m/min VARIOUS SHAPES OF INSERTS High Tool life High compressive strength High production rate Better surface finish
CUTTING TOOL MATERIALS
DIMOND:
Hardest substance BHN 7000 High heat conductivity (Twice then steel) High hot hardness 1650 ºC High wear resistance Very low co-efficient of friction High compressive strength High cutting speed (300 to 1000 m/min) High tool life •
Limitation:
•
High rigidity of setup is required.
Poor shock and impact resistance • Not suitable for ferrous materials
Used for cutting hard material like glass, plastic Ceramics and cemented carbides.
Used for turning and dressing wheel of grinding wheel Used for machining non-metallic and non-ferrous alloy
CUTTING TOOL MATERIALS
COATED CARBIDES:
Coating of micro thin layer insets made of tungsten carbide Most commonly used coating materials are: Titanium Nitride (TiN) Titanium Carbide (TiC) Titanium CarboNitiride (TiCN) Aluminium Oxide (Al 2 O 3 ) Zicronium Nitride (ZrN) Titanium Aluminium Nitride (TiAlN) Methods of Coatings - Chemical Vapor Depositio (CVD) - Physical Vapor Deposition (PVD)
CUTTING TOOL MATERIALS
SUPER COATED CARBIDES :
UE6020 for steel turning } Development by Mitsubishi Material UE5015 for C.I Turning } Corporation, Japan in 2000 WC- Higher interior Hardness and toughness Triple layer coating Inner layer –FCCN (Fibrous Crystalline Carbon Titanium ) Balance between wear resistance and fracture resistance Outer coating –Al 2 O 3 (Fine Grain) outer most layer – Special laminated Titanium Alloys Superior high temperature strength.
COATED CARBIDES:
Advantages:
High hot hardness Chemically stable High cutting speed -150 to 250 m/min High Tool life (2 to 3 times higher than carbide)
Applications:
Widely used for high speed machining Production of turning and milling of steels and C.I
Machining of very hard materials Used as inserts
CUTTING TOOL MATERIALS
MULTI PHASE COTING
Outer most layer specially laminated by titanium alloy Smooth surface structure and high chemical stability Two of three layers of various coating materials to get desired Properties High speed, continues cutting –Tic/ Al 2 O 3 Heavy duty, continues cutting –TiC/Al 2 O 3 / Tin Light interrupted cutting – TiC / TiC + TiN TiN - Low friction Al 2 O 3 – High thermal stability TiCN – Resistance to flank and crater wear
UCON Nitrided refectory metal alloy developed by Union Carbide, USA. Composition :50% columbium, 30%titanium and 20%tungsten and contain no carbides.
Hardness 2500-3000 vickers.
Manufacture by cast into ingots and rolled into sheets and then cut into strips.
Withstand very high temperature.
Used as through away inserts.
Excellent thermal shock resistance, High hardness and toughness.
Excellent resistance proof to diffusion and adhesion wear.
3-5 times more tool life then conventional carbide.
Cutting speed range of 250-500 M/Min on steels of 200 BHN
Application
Recommend for roughing, semi roughing and finishing cuts in turning, facing and boring.
Use for steel machining grade.
CUTTING TOOL MATERIALS
CUBIC BORON NITRIDE:
Sanitized artificially made under high pressure and high temperature.
Stable up to 1000 0 C temperature.
Manufactures under ultra high pressure and high temperature.
Excellent in chemical and thermal stability.
Hardness next to natural dimond.
Applications:
Permits high feeds and speeds.
Available in large varity of shapes and sizes in insert form.
Use to turn bore, face, groove and mill difficult to machine materials.
CUTTING TOOL MATERIALS
CUBIC BORON NITRIDE :
Material Recommended for cutting with CBN Alloy Steel (45-68 Rc) Carbon Tool Steel (45-68 Rc) Die Steel S (45-68 Rc) High Speed Steel (45-68 Rc)
CUTTING TOOL MATERIALS
PCD:
Synthetic having diamond matrix structure.
Sintered under extremely high temperature and pressure.
High in uniform hardness and abrasive resistance in all direction.
Very high tool life compare to carbide tool (50 times).
Shock resistance is more than natural dimond.
Consistency in wear resistance.
Available in large verity of shapes and sizes.
Discs as large as 58 mm in diameter.
Better thermal conductivity then natural dimond.
Lower cost then natural diamond.
Used for machining milling, turning, grooving, facing and boring.
CUTTING TOOL MATERIALS
TOOL/WORK CHEMICAL OR ADHESIVE INTERACTION SEVERITIES :
CUTTING TOOL MATERIALS
TOOL MATERIAL OXIDATION AND STRUCTURAL CHANGE TEMPERATURE RANGES:
CUTTING TOOL MATERIALS
REFERANCES:
production Technology- HMT Theory and Application of Metal Cutting by Thomas Child Production Technology- Kalpak Jain Production Technology – P.C.Sharma
Production Engineering and Sciences – By Pandey and Singh Metal Cutting – Milton Saw
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Regression Analysis :
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The money spend by the client on advertising and sales (in dollar) is given for different periods in following table : Advertising (X t ) $(1,00,000)
Sales (D t ) $(1,000.000)
D t 2 X t 2
X t D t
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