Tool Life
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Tool Life
Tool Life - Tool life may be defined as the effective cutting time between re sharpenings. When tool wear reaches a certain value, the tool is not capable of further cutting unless it is resharpened.
Tool life is the most important criterion for assessing
The performance of a tool material,
Machinability of work material, and
For determining cutting conditions.
Tool life may be estimated from
(i) Volume of material removed between two successive grindings of the cutting tool.
(ii) Number of workpieces machined between two successive tool grindings.
(iii) Time of actual cutting between two successive tool grindings.
Tool life (L) based upon the criterion of the volume of metal removal is given by the relation:
L = 1000. t.f. V. T. mm3/min
where t is depth of cut in mm.
f is feed in mm/revolution.
V is cutting speed in mpm.
T is time to tool failure in min.
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