Tool Wear Failure MCQ

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• Using the Taylor Equation for tool life and letting n = 0.5 and C = 120, calculate the percentage increase in tool life when the cutting speed is reduced by 50%.
  ক

  100%

  খ

  200%

  গ

  300%

  ঘ

  400%
• The relation between the tool life(T) in minutes and cutting speed (V) in m/min is
  ক

  VnT = C

  খ

  VTn = C

  গ

  Vn/T = C

  ঘ

  V/Tn = C
• Tool life is generally better when
  ক

  grain size of the metal is large

  খ

  grain size of the metal is small

  গ

  hard constituents are present in the micro structure of the tool material

  ঘ

  none of the mentioned
• The tool life is said to be over if
  ক

  poor surface finish is obtained

  খ

  there is sudden increase in cutting forces and power consumption

  গ

  overheating and fuming due to heat of friction starts

  ঘ

  all of the mentioned
• Tool life is measured by the
  ক

  number of pieces machined between tool sharpenings

  খ

  time the tool is in contact with the job

  গ

  volume of material removed between tool sharpenings

  ঘ

  all of the mentioned
• Flank wear occurs mainly on the
  ক

  nose part, front relief face and side relief face of the cutting tool

  খ

  face of the cutting tool at a short distance from the cutting edge only

  গ

  cutting edge only

  ঘ

  front face only
• The tool may fail due to
  ক

  cracking at the cutting edge due to thermal stresses

  খ

  chipping of the cutting edge

  গ

  plastic deformation of the cutting edge

  ঘ

  all of the mentioned
• Crater wear is usually found while machining ductile materials.
  ক

  True

  খ

  False
• Crater wear leads to
  ক

  increase in cutting temperature

  খ

  weakening of tool

  গ

  friction and cutting forces

  ঘ

  all of the mentioned
• Crater wear is mainly due to the phenomenon is known as
  ক

  adhesion of metals

  খ

  oxidation of metals

  গ

  diffusion of metals

  ঘ

  none of the mentioned
• Flank wear is due to the abrasive action of hard mis-constituents.
  ক

  True

  খ

  False
• Crater wear is predominant in
  ক

  carbon steels

  খ

  tungsten carbide tools

  গ

  high speed steel tools

  ঘ

  ceramic tools
• Flank wear depends upon the
  ক

  hardness of the work and tool material at the operating temperature

  খ

  amount and distribution of hard constituents in the work material

  গ

  degree of strain hardening in the chip

  ঘ

  none of the mentioned
• Crater wear occurs mainly on the
  ক

  nose part, front relief face and side relief face of the cutting tool

  খ

  face of the cutting tool at a short distance from the cutting edge only

  গ

  cutting edge only

  ঘ

  front face only