Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Reexamination Certificate
1999-09-02
2001-05-29
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
C029S889700
Reexamination Certificate
active
06238186
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of manufacturing a blade which is one component of a runner, an impeller, etc. for fluid machinery, such as a pump, a water-turbine or a pump-turbine.
2. Description of the Related Art
FIG. 6
illustrates a conventional method of manufacturing a blade for fluid machinery by working, such as plastic working, a plate-shaped component. As step
1
, a plate-shaped component
1
is deformed (worked) to obtain an intermediate formed material
2
(preform) which has a predetermined shape, keeping a constant thickness. Then, as step
2
, at least one side of the preform
2
is machined, such as by computer numerical control (CNC) machining, into a final blade form (blade
3
) having the desired blade cross-section(s).
The above-described method is generally efficient for simple blade shapes. However, in the case of a blade having a complex three-dimensional-curved surface, the machining step is much more involved, thus reducing manufacturing efficiency.
Moreover, due to the complex curved surfaces of the preform, it is often difficult to firmly clamp the preform in a fixture so that accurate machining can be performed.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of manufacturing a blade for fluid machinery which overcomes the disadvantages of the prior art described above.
It is a further object of the present invention to provide a method of manufacturing a blade for fluid machinery which enables efficient and reliable manufacture.
These and other objects are accomplished by a method of manufacturing a blade for fluid machinery from a plate-shaped component, comprising the steps of: first machining at least one side of the plate-shaped component to make a preform of predetermined shape; and then working the preform into a final predetermined blade shape.
REFERENCES:
patent: 4164061 (1979-08-01), Bronovsky et al.
patent: 5083371 (1992-01-01), Leibfried et al.
Mibe Yoshitake
Nakazono Masahiko
Obata Kenji
Sato Shinsaku
Tai Hajimi
Foley & Lardner
Kabushiki Kaisha Toshiba
Look Edward K.
McAleenan James M
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