Page 17 - february

METALWORKING EQUIPMENT AND TOOLS

The most important element
of tool wear, directly related to a
the machining accuracy of the
crankshaft journals, is radial wear.
The advantage of using radial wear
as a criterion for the bluntness of a
cutter is because it is directly related
to the requirements for the accuracy
and roughness of the machined
surface. The amount of radial wear radial wear, r, µm
was measured by removing the
cutter from the machine, installing
it in a special device equipped with operating time, min
an indicator head with a graduation
of 0.001 mm. The investigations b
were carried out in conditions of
roughing, finishing and fine turning
with both domestic plates of hard
alloy T15K6, VK6, T5K10, and using
cutting plates of the Sandvik and
Intra companies.
Taking into account the radial wear, r, µm
processing conditions, we used operating time, min
cutting inserts with mechanical
fastening, multifaceted, with a Fig. 1. Dependence of the radial wear of cutters on the operating time for various
negative rake angle. The cutting cutting plates in rough turning a)RS from steel 30HGSA and b)RS from steel 60S2A.
speed was limited by insufficient
imbalance of the crankshafts, which led to forced vibrations and vibrations in the cutting zone,
contributing to accelerated wear of the cutter. Preliminary studies have revealed the maximum
possible peripheral speed of the shaft journals, which was 30 m/min. All wear tests were carried
out at cutting speeds of 18 ... 25 m/min at a cutting depth of 0.05 ... 0.1 mm and feed rate of
0.1 mm/rev.
Figure 1 shows the graphs of the radial wear of the cutters depending on the cutting time
during roughing, welded with RS from various materials. Analysis the results obtained showed
the low efficiency of domestic hard alloys. Hard alloy with wear-resistant coating GC4235 showed
a high wear resistance.

Stanochniy park 17