Mold precision pins for component location during fabrication of wind turbine blades
A wind turbine blade mold system having built in precision pins to locate structural components (e.g. spar caps) during layup of composite segments. A plurality of pins can be inserted through the layers of composite layups and into apertures within the mold, with spar caps positioned against the pins to ensure precise positioning, thereby preventing/inhibiting movement of the spar cap relative to the mold. A plurality of pins can be inserted through the layers of composite layups and into apertures within the mold, with cams attached to the pins and moveable to engage spar caps to ensure precise positioning of the spar cap, as well as preventing any drift during subsequent operations. The pins can remain embedded within the final molded part.
1. A wind turbine blade mold system comprising:
a first mold surface;
at least one aperture located within the first mold surface, the at least one aperture configured to receive a pin;
a cover disposed above the at least one aperture, the cover sized to circumscribe the at least one aperture and configured to prevent ingress of a resin in the at least one aperture, the cover configured to receive a plurality of layers of composite material disposed thereon;
at least one pin having a first end and a second end defining a sidewall with a length extending therebetween, the second end of the pin disposed within the at least one aperture and the first end of the pin extending above the first mold surface;
at least one layer of composite fiber disposed on the first mold surface;
a structural component disposed on the at least one layer of composite fiber;
wherein a portion of the at least one pin sidewall is configured to engage a structural component of a wind turbine blade, the at least one pin preventing displacement of the structural component;
a compression plate, the compression plate including at least one flange to engage the structural component of the blade; and
a second mold half, wherein the first mold surface is defined in a first mold half and the second mold surface is defined in a second mold half, with the first mold half and second mold half arranged side by side in an open configuration.
2. The system of claim 1 , further comprising a plurality of apertures asymmetrically disposed about a spanwise central axis of the blade mold.
3. The system of claim 1 , wherein the structural component of the wind turbine blade is a spar cap.
4. The system of claim 1 , wherein a perimeter of the first end of the at least one pin is greater than a perimeter of the second end of the at least one pin.
5. The system of claim 1 , wherein at least one pin extends beyond the upper surface of the composite material disposed on the first surface of the mold.
6. The system of claim 1 , wherein the cover includes a frangible portion, the frangible portion retained within the pin upon insertion of the at least one pin into the aperture.
7. The system of claim 1 , wherein a portion of the at least one pin is retained within the wind turbine blade upon removal from the blade mold.
8. The system of claim 1 , wherein the first end of the pin includes a locking feature, the locking feature configured to engage the compression plate.
9. The system of claim 8 , wherein the locking feature is a threaded portion of the at least one pin, the threaded portion configured to engage a threaded hole disposed in the compression plate.
10. The system of claim 9 , wherein the compression plate further comprises a collar extending from a surface of the compression plate, the threaded hole disposed within the collar.
11. The system of claim 8 , wherein the compression plate displaces downwards when engaged with the locking feature and applies a compressive force to the structural component.
12. The system of claim 1 , wherein the first end has a cross-sectional area larger than the second end.