Wears of Cutting Tool
China precision machining We already have been
processed and the rattle of the countless cracks edge tool, we learn that tool
wear are basically three forms : flank wear, the former flank wear and V-Notch
wear. Flank wear occurred in both the main blade occurred vice blade. On the
main blade, shoulder removed because most metal chip mandate, which resulted in
an increase cutting force and cutting temperature increase, If not allowed to
check, That could lead to the work piece and the tool vibration and provide for
efficient cutting conditions may no longer exist. Vice-bladed on, it is
determined work piece dimensions and surface finish. Flank wear size of the
possible failure of the product and surface finish are also inferior. In most
actual cutting conditions, as the principal in the former first deputy flank
before flank wear, wear arrival enough, Tool will be effective, the results are
made unqualified parts.
As
Tool stress on the surface uneven, chip and flank before sliding contact zone
between stress, in sliding contact the start of the largest, and in contact
with the tail of zero, so abrasive wear in the region occurred. This is because
the card cutting edge than the nearby settlements near the more serious wear,
and bladed chip due to the vicinity of the former flank and lost contact wear
lighter. This results from a certain distance from the cutting edge of the
surface formed before the knife point Ma pit, which is usually considered
before wear. Under normal circumstances, this is wear cross-sectional shape of
an arc. In many instances and for the actual cutting conditions, the former
flank wear compared to flank wear light, Therefore flank wear more generally as
a tool failure of scale signs. But because many authors have said in the
cutting speed of the increase, Maeto surface temperature than the knife surface
temperatures have risen faster. but because any form of wear rate is
essentially temperature changes by the significant impact. Therefore, the
former usually wear in high-speed cutting happen.
China precision machining The main tool flank wear the
tail is not processed with the work piece surface in contact, Therefore flank
wear than wear along with the ends more visible, which is the most common. This
is because the local effect, which is as rough on the surface has hardened
layer, This effect is by cutting in front of the hardening of the work piece.
Not just cutting, and as oxidation skin, the blade local high temperature will
also cause this effect. This partial wear normally referred to as pit sexual
wear, but occasionally it is very serious. Despite the emergence of the pits on
the Cutting Tool nature is not meaningful impact, but often pits gradually
become darker If cutting continued the case, then there cutter fracture crisis.
If
any form of sexual allowed to wear, eventually wear rate increase obviously
will be a tool to destroy failure destruction, that will no longer tool for
cutting, cause the work piece scrapped, it is good, can cause serious damage
machine. For various carbide cutting tools and for the various types of wear,
in the event of a serious lapse, on the tool that has reached the end of the
life cycle. But for various high-speed steel cutting tools and wear belonging
to the non-uniformity of wear, has been found : When the wear and even to allow
for a serious lapse, the most meaningful is that the tool can re-mill use, of
course, In practice, cutting the time to use than the short time lapse. Several
phenomena are one tool serious lapse began features : China precision machining the most common is the sudden increase cutting force, appeared on
the work piece burning ring patterns and an increase in noise.
没有评论:
发表评论