Extrusion die and method for extruding a rotor shaft for a wind turbine generator
OwnerManu Mathai, Thirumaleshwara Bhatinventors
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Abstract
An extrusion die for radial extrusion of a rotor shaft for a wind turbine generator has a body and a mandrel received in the body. The mandrel and body cooperatively define a tubular interior chamber. A punch is received in the tubular interior chamber and is moveable with respect to body and mandrel. A radial extrusion insert has a radial interior chamber in communication with the tubular interior chamber. The radial extrusion insert includes an arcuate edge disposed in a transition area between the tubular interior chamber and the radial interior chamber.
Claims20
An extrusion die for radial extrusion of a rotor shaft for a wind turbine generator, the die comprising:
- a body;
- a mandrel received in the body, the mandrel and body cooperatively defining a tubular interior chamber;
- a punch received in the tubular interior chamber and moveable with respect to the body and the mandrel;
- and
- a radial extrusion insert having a radial interior chamber in communication with the tubular interior chamber, the radial extrusion insert comprising an arcuate edge disposed in a transition area between the tubular interior chamber and the radial interior chamber.
A method for manufacturing a rotor shaft for a wind turbine, said method comprising:
- heating a metallic material to a temperature suitable for extruding;
- extruding the metallic material by driving the heated metallic material into a die using a punch, the heated metallic material being driven in a first direction generally axial of the die and in a second direction generally radial to the axial direction of the die;
- and
- allowing the metallic material to cool.
An extruded rotor shaft for a wind turbune generator comprising a tubular stem and a flange extending radially outward from the tubular stem, the rotor shaft being in a residual compressive stress state throughout its entirety.
Dependencies are inferred from the claim text.