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METALWORKING EQUIPMENT METALWORKING EQUIPMENT
AND TOOLS AND TOOLS
The solution of the problem
One of the leading methods to ensure a high and stable surface quality, therefore, to
increase the durability and reliability of machine parts, is surface plastic deformation (SPD).
The SPD method is simple to implement, economical, has high productivity, allows for low
STUD roughness and a given degree of hardening, and forms useful residual compressive stresses
STUDY OF THE INFLUENCE OF SURFACE Y OF THE INFLUENCE OF SURFACE
and other indicators of surface quality. To conduct experiments on the surface hardening of the
PLASTIC DEFORMATION ON ROUGHNESSSTIC DEFORMATION ON ROUGHNESS guide vane by the method of surface plastic deformation, a technology was developed for the
PLA
automated hardening of parts made from powder alloys. The special device for reinforcing rolling
by rollers was designed and manufactured, which allows, thanks to the spring mechanism, to
change the pressure force of the roller during rolling. A special mandrel has been designed and
manufactured to fix the workpiece with a minimum permissible runout. It was experimentally
established that with an increase in the rolling force, the surface roughness decreases. The
surface roughness also depends on the radius of the profile of the roller R. At R = 10 mm, the

Introduction roughness is less than at R = 20 mm, which is associated with an increase in the contact spot
The rapid development of scientific of the roller and the part. [1] Processing was carried out on a lathe. In order to avoid tearing
and technological progress and the Formulation of the problem the workpiece, it was tightened by the center
conditions of competition in the world The directing device of the submersible pump of the tailstock. A fixture was installed in the
market pose a challenge for modern stage is designed to convert radial flows into axial tool holder, the roller clamping force was
production to significantly increase flows for subsequent stages and to create the pressure set, regulated by the divisions on the fixture
productivity and quality of products. necessary for pumping the liquid. The guiding apparatus (1 division corresponds to a force of 1210
Improvement of technical and economic is made of ZhGr1D15 and Kh11N8D20 composite N). Before hardening, the outer cylindrical
indicators of engineering products powder materials by pressing and subsequent heat surface of the CPM blanks was subjected to
is achieved by the use of parts and treatment. In the process of activity of a separate unit, turning to achieve a roughness Ra = 0.76
assemblies from new powder materials it was revealed that under the existing conditions, the μm. During processing, coolant was supplied
with high strength characteristics: time between failures and ‘‘harsh‘‘operating conditions to the strain hardening zone.
heat resistance, wear resistance and there is intense wear of the guide apparatus. Additional The hardening treatment by surface
others. Today this is most relevant machining is required to reduce wear. surface, providing plastic deformation was carried out in various
for plants engaged in the production the necessary qualities of the surface layer - sufficient a modes using rollers: with a diameter of D =
of submersible pumping units. During hardness, low roughness. 60 mm and a profile radius of R = 2 mm, D
operation, most parts and assemblies = 60 mm and R = 20 mm, D = 60 mm and
of submersible pumps experience R = 10 mm, D = 30 mm and R = 5 mm. As
high temperature and power loads a result of studies, it was found that positive
from fluid flow and centrifugal forces, structural changes occurred in the surface
significant vibration loads, the influence layer. The hardness of the samples increased.
of aggressive environments, etc. After hardening treatment, an improvement
in roughness from 8% to 79% was obtained.
Figure 1 shows the dependence of the change
in roughness Ra on the force P after rolling in
a composite powder material ZhGr1D15.

b
Fig. 1. The dependence of the change in roughness Ra on the Conclusion
force running in P: Based on the experiments, it was found
a - a roller with a diameter of D = 60 mm, that surface plastic deformation significantly
the radius of the profile of the roller R = 20 mm;
b - a roller with a diameter of D = 30 mm, reduces the roughness of parts made from
the radius of the profile of the roller R = 5 mm powder alloys. The optimal regimes of
hardening treatment of composite powder
materials ZhGr1D15 and Kh11N8D20 by
surface plastic deformation are obtained.

M.E. Skladanov, graduate student.
Scientific adviser: E. Yu. Kropotkina,
Doctor of Technical Sciences, Associate Professor. MSTU STANKIN,
Department of Highly Effective Technologies processing

References:
1. Kropotkina E.Yu., Flagentov V.A. Hardening of parts from powder alloys by rolling in // Bulletin of mechanical engineering.
2015. No. 8. pp. 35 - 36.

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