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P ’ R<br />
φφφφ<br />
F v<br />
F h<br />
Forces and stresses in metal cutting<br />
F ns<br />
F s<br />
F n<br />
αααα<br />
ββββ<br />
F t<br />
P R<br />
chip<br />
Force component in orthogonal<br />
machining.<br />
Rake face<br />
P R - the resultant force between the tool<br />
face and the chip<br />
P ’ R<br />
- the equal resultant force between<br />
the workpiece and the chip<br />
The resultant force to the rake face of the<br />
tool can be resolved into tangential<br />
component F t and normal component F n ,<br />
• The horizontal (cutting) F h and vertical (thrust) F v forces in cutting can<br />
be measured independently using a strain-gauge toolpost dynamometer.<br />
• It can be shown that<br />
F = F α + F cosα<br />
t<br />
F = F α − F sinα<br />
n<br />
h<br />
h<br />
sin v<br />
cos v<br />
Rake face<br />
αααα<br />
PR Fh Suranaree University of Technology Tapany Udomphol<br />
Jan-Mar 2007<br />
F n<br />
F t<br />
F v<br />
ββββ<br />
F v cosαααα<br />
αααα<br />
F hsinαααα<br />
αααα<br />
F vsinαααα F h cosαααα
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