Forged Entire CNC Machined Francis Runner
Forging could considerably improve metal’s organizational structure
and mechanical property.
Forging offers uniformity of composition and structure. Forging
results in metallurgical recrystalisation and grain refinement as a
result of the thermal cycle and deformation process. This
strengthens the resulting steel product particularly in terms of
impact and shear strength.
Forged steel is generally stronger and more reliable than castings
of same material due to the fact that the grain flows of the steel
are altered, conforming to the shape of the part.
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Forged Integrally +100% CNC Machining Francis Turbine Runner
1. GETAI has improved the manufacturing procedure of Francis
turbine runner which suffered from the problems such as the
cavitation and abrasion, welding seam cracks between crown, band
and vanes, block worn off from vane etc. The whole Francis runner
is forged integrally followed by entire CNC machining to eliminate
tiny blowholes and slag inclusions existed on passage surface which
accelerate cavitation and abrasion, and solve the potential risk
existed by unreleased stress left after welding. The Francis
turbine runner service life prolonged consequently.
In the case the high head Francis runner with long and narrow
passageway which is hard for entire CNC machining or the runner
size exceeds the forging range which can not be forged integrally,
GETAI applied a procedure by dividing the runner to two parts which
consisted of crown with half vanes and band with rest half, both
two parts can be forged integrally with entire CNC machining and
welding assembled in final. The welding applied to the middle of
vane, where is convenient for single pass welding without touch of
potential crack area, the operation security and service life are
Samples exhibited below is for forged integrally+100% CNC machined
Francis turbine runner (half part) which finished by our five axis
linkage CNC machine.
Getai Hydropower is Pelton Turbine Experiment, Francis Turbine Diagram, Francis Turbine Working, Pelton Turbine For Sale factoty.
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