Page 18 - Апрель

METALWORKING EQUIPMENT AND TOOLS

Stabilization of the stress-strain state of the surface layer of
the part during cutting using vibroacoustic monitoring

The state of the surface layer
after machining affects the performance
characteristics of the part: corrosion
and fatigue resistance, dimensional
stability during operation. Tool wear can have a decisive effect on surface deformations. The
work is devoted to monitoring the effect of tool wear on the deformation of the surface layer
of the part by analyzing vibration signals accompanying cutting

In modern mechanical engineering,
especially related to aerospace technology,
many parts have to work at high temperatures,
in contact with aggressive media, in the
presence of high static and dynamic stresses.
All these factors lead to the appearance of
various defects on the surface of the part. Most
often, the nucleation of such defects occurs
in a thin near-surface layer of parts, which
is largely formed when the corresponding
processing technology is implemented. Practice
has established a close relationship between
the properties of the surface layer of parts and
their operational properties including strength
and durability.
There are many reasons for this
relationship [1]. For loaded parts, the surface
layer is in more difficult conditions; risks and
irregularities on the surface are the centers of
formation and development of fatigue cracks;
the presence of dislocations and micro cracks of
an atomic scale at large degrees of deformation
contributes to the formation of non-healing
micro cracks prone to propagation; when
operating parts at high temperatures, parts
without strain hardening have advantages in
strength; large degrees of deformation of the
surface layer reduce the resistance of parts to

18 Stanochniy park