Page 13 - Stanochny park

METALWORKING EQUIPMENT AND TOOLS

Table 1.
Results of measurements of the microgeometry of the surface of the counterbodies and
specimens with copper coating applied at a temperature of 450 °C, carried out before and
after the tests.

Working Roughness, μm
environment Before the test Cleanliness After the test Cleanliness After the test
class, class,
Ra Rz Ra Rz

counterbody
oil 0,135 0,785 10-11 0,057 0,396 11-12
Litol 24 0,135 0,847 10-11 0,084 0,510 11
Coated sample
oil 0,292 0,855 9 0,15 2,189 10
Litol 24 0,073 0,833 11 0,116 1,298 10-11

10-6 m testing in Litol-24 lubricant allows lowering these parameters not so significantly: from
0.847 x 10-6 m to 0.510 x 10-6 m and from 1.486 x 10-6 m to 0.866 x 10-6 m. Based on the
results of the study, it can be noted that the test in liquid lubricant has a more favorable effect
on the surface quality.
The surface quality of the copper coating increases after the test of a pair in industrial oil
from grade 9 to grade 10 (Table 1). Assessing the surface by additional parameters Rz and Rt,
it can be noted that the average value of ten projections and depressions increases from 0.855
x 10-6 m to 0.15 x 10-6 m, and the sum of the maximum projection and depression increases
more significantly - from 1.326 x 10-6 m to 3.206 x 10-6 m. After testing the pair in Litol-24
lubricant, the surface finish class of the copper coating decreases slightly (Table 1). The value
of the parameter Rz changes more significantly - from 0.853 x 10-6 m to 1.298 x 10-6 m, and
the value of Rt increases from 1.486 x 10-6 m to 2.440 x 10-6 m. In general, it can be noted
that the presence on the surface coatings of a system of notches up to 2 x 10-6 m (Rt) with
an overall high class of surface cleanliness (10 - 11) can have a positive effect on the wear
resistance of a friction pair ShKh15 steel - copper coating due to the formation of oil grooves.
The results of measurements of the microgeometry of the surface of the counterbodies
and specimens with a copper coating applied at a temperature of 270 °C, carried out before and
after the test, are shown in Table 2.
Analysis of the state of the surface of the samples after testing shows that when the mating
of the samples from ShKh15 steel with a coating applied at a temperature of 270 °C works, the
surface quality of the counterbodies improves (Table 2). At the same time, the improvement of
the surface quality is more noticeable when the pair is operating in the Litol-24 lubricant, where
not only the average profile deviation decreases, but also the Rz and Rt parameters decrease
significantly - from 1.147 μm to 0.811 μm and from 1.599 μm to 1.120 μm.

Table 2.
Results of measurements of the microgeometry of the surface of counterbodies and
specimens with copper coating applied at a temperature of 270 °C, carried out before and
after the tests.

Working Roughness, μm
environment Before the test Cleanliness After the test Cleanliness
class, class,
Ra Rz Ra Rz

counterbody
oli 0,135 0,785 10-11 0,057 0,396 11-12
Litol 24 0,135 0,847 10-11 0,084 0,510 11
Coated sample
oil 0,292 0,855 9 0,15 2,189 10
Litol 24 0,073 0,833 11 0,116 1,298 10-11

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