Page 27 - january

METALWORKING EQUIPMENT AND TOOLS

The SPD method is simple to implement,
economical, has high productivity, allows to
provide low roughness and a given degree of
hardening, forms useful residual compressive
stress and other indicators of surface quality.
To carry out experiments on surface
hardening of the guide vanes by surface
plastic deformation, a technology was developed
for automated hardening processing of parts made of
powder alloys. A special device for hardening roller rolling
was designed and manufactured, which allows, thanks to the spring
mechanism, to change the roller clamping force during rolling. A special mandrel has been
developed and manufactured, which allows fixing the
workpiece with the minimum allowable runout. It has
been experimentally established that with an increase
in the rolling force, the surface roughness decreases.
The surface roughness also depends on the radius of
the roller profile R. At R = 10 mm, the roughness is
less than at R = 20 mm, which is associated with an
increase in the contact spot between the roller and
the part.

а)

b)

Fig. 1. Dependence of the change in roughness
Ra on the force rolling P:
a - roller with diameter D = 60 mm, the radius of
the roller profile R = 20 mm;
b - a roller with a diameter of D = 30 mm, radius
of the roller profile R = 5 mm.

Stanochniy park 27