Tool Failure | Definition and Types


Tool failure

Tool wear is a gradual phenomenon of failure of the tool due to its operating conditions.There is an equation which provides the relationship between several aspects of the tool.
Moreover in general
  • If surface hardness tool > surface hardness of workpiece then no substantial increase in tool wear with speed increase.
  • If surface hardness tool < surface hardness of workpiece then there is the substantial increase in tool wear with speed increase.
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https://en.wikipedia.org/wiki/Tool_wear

Tool failure is two types

1. Slow death: The gradual or progressive wearing away of rake face (crater wear) or flank (flank wear) of the cutting tool or both.

2. Sudden death: Failures leading to the premature end of the tool predict. Tool failure mechanisms include plastic deformation, brittle fracture, fatigue fracture or edge chipping. However, it is difficult to predict which of these processes will dominate and when tool failure will occur.

Types of Tool Wear

(a) Flank Wear
(b) Crater Wear
(c) Chipping off of the cutting edge

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