Abstract:
There are several factors like relative motion and positionof
the tool and work piece, diameter of the work. piece,
diameter of the work piece and depth of cut whicl"have a
great influence on the tool wear, particularly, quring
thread cutting process~ The present study has taken an
,
attempt to investigate the cl"aracteristics of tool wear
duting cutting V-threads. Anumber of threads have been cut
with selected- pitch, diameter and depth of threads in order
to show the relationships of tool Wear"ith pitch and diameter
of threads. wear readings were recorded under microscope
for each case.
Someimportant characteristics of. tool wear have been found
out from this study. All findings have been justified.by some
established principles of metal cuttingbased on several
past research works. The study shows an important characteristic.'
that wears on right cutting edge are al'iays greater
than that on left cutting edge for a right cut tool .• Investigations
show that cl"ange of static tool geometry during
actual cutting process can be considered as responsib.1e for
th'is characteristic. ,Ho,;ever, this nature of unequal wani'
may lead the tool for regrinding very soon,because Wear on
rig:tlt cutting edge reaches its critical value before the Wf'tone.
iii
In order to avoid this difficu1ty, a mathematical model
has been deve10ped to specifY the static tool geometry
\<hich could ensure the clesired too1 geometry during
actua1 thread cUtting process. The mode1 has considered
the effects of relative motion and position of tool and
workpiece on tool geometry during eutling process. V1ti-
*-6 mate1y, a too1 Was designed according/the tleve10ped mode1
_ and experiment Was conducted further to compare the nature
of wear with that of origina1 too1. The result of using
modified tool was verJ satisfactory as the wears on both
cutting e'dges were, seen a1most equa1 and the overa11 too1
,wears have been reduced some "hat.
