THE NEW TECHNOLOGY OF A BALL CRANES VALVE
MACHINING
The process of valve sphere finishing is making by a surface plastic
deformation. It is a planetary smoothing rolling method. The new way is
protected by the patent. The rolling operation is performed right after
the turning instead of the grinding operation. As a tool is now used a
rolling head of original design. Roughness of machined surface is within
Ra 0,2... 0,4 micron. The error of a sphere form does not exceed 0,01 mm.
While
changing from grinding to rolling operation have been achieved the
following benefits:
·
tooling
cost reduced by 6 times;
·
no
need to buy special grinding tools;
·
rolling
tool
regrinding times frequently exceed grinding wheel regrinding times;
·
sphere
surface quality is improved;
·
raise
of processing productivity;
·
power-consumption
is reduced;
·
operator’s
working conditions are improved;
·
abrasive
deterioration
of the equipment is excluded;
·
resistance
to deterioration of valves
is raised.
The
planetary smoothing rolling is expedient for using both up to, and after a
chromium covering of the sphere. Results of the tests show that such
processing allows to raise corrosion and tired durability of a chromium
covering considerably.
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