tool life & tool wear ppt by ankit & vikram
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tool life and tool wear ppt by ankit and vikramTRANSCRIPT
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TOOL WEAR &
TOOL LIFE
By Ankit nayakVikram singh
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DEFINED AS- It may be the actual cutting time before failure . Volume of work material removed before the
failure. Number of component produced before failure. The cutting speed at which it is removing the
material for specified time . The length of material removed before the failure.
TOOL LIFE
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VTn = C
WhereV= Cutting speed (m/min)T= Time (min)n = Exponent depends on tool material c = constant biased on tool and work material and cutting condition
TAYLOR’S TOOL LIFE EQUATION
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v= cutting speed t= tool life 1= HSS
2=Carbide3=Ceramic
Log V
log t ©
TOOL LIFE CURVE
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2
1
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n = 0.08 to 0.2 for HSS tool=0.1 to 0.15 for cast alloy=0.2 to 0.4 for carbide tool=0.5 to 0.7 for ceramic tool
VALUES OF EXPONENT ‘n’
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VTnfadb = CWhere: d = depth of cut f = feed rate OR
1/n > 1/m > 1/p
EXTENDED ORMODIFIED TALYLOR’S EQUATION
Reduction in Tool Life30-7
Operating Conditions
CUTTINGSPEED + 50%
FEEDRATE + 50%
DEPTH OFCUT + 50%
90% 60% 15%
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Cutting speed . Tool geometry. Tool material. Work material. Coolants.
Factors Affecting the Life of a Cutting Tool
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A device with one or more edges used to create chips and remove metal. Cutting tools are either single point or multi-point tools.
CUTTING TOOL
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R&D LAB
Total breakage of cutting tool or tool tip
Excessive rise in cutting forces and vibrations
Flank and crater wear reach their limit
CONDITION DESIDING FOR TOOL FAILURE
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Mechanical breakage. Plastic deformation. Gradual wear.
1. Crater wear2. Flank wear
FAILURE OF CUTTING TOOL&
TOOL WEAR
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It occur on Flank Surface RESIONS-* Abrasion by hard particles.* Shearing of micro weld between tool and
work material.* At low speed flank wear predominate.* If MRR increase flank wear increase.
FLANK WEAR
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EFFECT-* Flank wear directly affect the component
dimension.* Decrease tool life.* Rough surface finish.
FLANK WEAR
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Primary wear Secondary wear Tertiary wear
FLANK WEAR
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FLANK WEAR
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Crater wear occurs on the rack surface . More common in ductile materials which
produce continuous chip. At very high speed crater wear pre-
dominates.
CRATER WEAR
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Crater wear linear increase with time. It increase with MRR. Crater wear has little effect on work piece
tolerance or surface finish.
CRATER WEAR
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C. W.
time
CRATER WEAR
MRR increasing
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Crater Wear and Flank Wear
Crater wear
Flank wear
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Abrasion wear Adhesion wear Diffusion wear
WEAR MECHANISM
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Manufacturing science by GOSH & MALLIK . Production engg. and Science by PANDAY &
SINGH. Production engg. By SWADESH KUMAR. Metal cutting by A. BHATTACHARYYA. web.iitd.ac.in/~suniljha/MEL120/Tool
%20Life2012.pdf nptel.iitm.ac.in/courses/Webcourse-
contents/.../pdf/LM-14.pdf
REFRANCES
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Thanks