Perimeter plates for wind turbine blade manufacturing
A method of manufacturing a composite structure, e.g. wind turbine blade, using reusable and removable perimeter plates to establish air flow channels in conjunction with a vacuum bag and mold. An exemplary setting is the perimeter of large wind blade shells where a perimeter vacuum is used to retain the part in the mold for the bonding process. The reusable plates disclosed herein create air channels whether the vacuum is introduced to the perimeter of the mold: i) through the flange in different locations; or ii) with the use of vacuum lines into the perimeter bag; or iii) built in vacuum channels in the flange of the mold.
1. An apparatus for forming a wind turbine blade comprising:
a plurality of removable plates, each plate having an upper and lower surface;
the removable plates configured to be disposed along at least one of the leading edge and trailing edge of the wind turbine blade mold,
at least one removable plate of the plurality of removable plates having a plurality of air flow channels formed therein,
a first channel of the plurality of air flow channels formed in an upper surface and a second channel of the plurality of air flow channels formed in a lower surface, with a through hole formed at an intersection of the first channel and second channel for air to flow through the first plate of the plurality of removable plates;
wherein the at least one removable plate is configured to establish air flow channels for removal of air within a vacuum bag and blade mold; and
wherein the at least one removable plate includes a first removable plate on a flat surface of the wind turbine blade mold and a second removable plate disposed adjacent to the first removable plate, with the second removable plate extending from a flat surface of the wind turbine blade mold to an inclined surface of the mold.
2. The apparatus of claim 1 , wherein the channels are formed at approximately a 45° angle with respect to a lower edge of the removable plate.
3. The apparatus of claim 1 , wherein the channels are uniformly spaced apart across the upper surface of the removable plate.
4. The apparatus of claim 1 , wherein at least one channel is formed with a different depth than another channel.
5. The apparatus of claim 1 , wherein the channel depth is half the width of the removable plate.
6. The apparatus of claim 1 , wherein the depth of a channel varies across the removable plate.
7. The apparatus of claim 1 , wherein a plurality of channels in the upper surface are oriented to converge forming points of intersection.
8. The apparatus of claim 1 , further including removable tip plates having a generally v-shaped profile, the removable tip plates disposed in an abutting configuration with the at least one removable plate.
9. The apparatus of claim 1 , wherein the removable plates are made from at least one of a high-density polyethylene (HDPE), PPG based polyether elastomeric polyurethane and/or combinations thereof.
10. The apparatus of claim 1 , wherein the first removable plate remains generally planar during said removal of air.
11. The apparatus of claim 1 , wherein the second removable plate conforms to a contoured geometry during said removal of air.
12. An apparatus for forming a wind turbine blade comprising:
a plurality of removable plates, each plate having an upper and lower surface;
the removable plates configured to be disposed along at least one of the leading edge and trailing edge of the wind turbine blade mold,
at least one removable plate of the plurality of removable plates having a plurality of air flow channels formed therein,
a first channel of the plurality of air flow channels formed in an upper surface and a second channel of the plurality of air flow channels formed in a lower surface, with a through hole formed at an intersection of the first channel and second channel for air to flow through the first plate of the plurality of removable plates;
wherein the at least one removable plate is configured to establish air flow channels for removal of air within a vacuum bag and blade mold; and
a vacuum bag, the vacuum bag having a perimeter at least partially sealed with the blade mold; and
removable tip plates having a generally v-shaped profile, the removable tip plates disposed in an abutting configuration with the at least one removable plate.
13. The apparatus of claim 12 , wherein the channels are uniformly spaced apart across the upper surface of the removable plate.
14. The apparatus of claim 12 , wherein at least one channel is formed with a different depth than another channel.
15. The apparatus of claim 12 , wherein the channel depth is half the width of the removable plate.
16. The apparatus of claim 12 , wherein the depth of a channel varies across the removable plate.
17. The apparatus of claim 12 , wherein a plurality of channels in the upper surface are oriented to converge forming points of intersection.
18. The apparatus of claim 12 , wherein the removable plates are made from at least one of a high-density polyethylene (HDPE), PPG based polyether elastomeric polyurethane and/or combinations thereof.