Chip formation vs tool edge condition When the cutting edge becomes dull due to wear, what chip type is most likely to appear (under typical ductile-work cutting)? Choose the best answer.
Mechanical Engineering
Production Engineering
Difficulty: Easy
Choose an option
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AContinuous chips (clean, without instability)
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BDiscontinuous chips regardless of material
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CContinuous chips with a built-up edge (BUE) on the tool
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DNo chip formation occurs
Answer
Correct Answer: Continuous chips with a built-up edge (BUE) on the tool
Explanation
ConceptA dull tool increases friction and temperature at the tool–chip interface, promoting built-up edge on ductile materials. BUE causes poor surface finish and fluctuating cutting forces.
Eliminations(a) Clean continuous chips are more typical with sharp tools and good lubrication.(b) Discontinuous chips are more typical with brittle materials or very low cutting speeds, not solely due to dullness.(d) Chip formation continues unless cutting stops.
Final AnswerContinuous chips with a built-up edge (BUE) on the tool.