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. A method of manufacturing a wind turbine blade comprising:
providing a plurality of removable plates,
the removable plates disposed along at least one of the leading edge and trailing edge of a wind turbine blade mold,
at least one removable plate of the plurality of removable plates having a plurality of channels formed therein,
wherein the removable plates are configured to establish air flow channels in conjunction with a vacuum bag and mold;
placing a first of the removable plates on a flat surface of the wind turbine blade mold;
placing a second of the removable plates 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;
providing a vacuum seal around the perimeter of the wind turbine blade mold; and
removing air from the wind turbine blade mold through the channels in the removable plates;
wherein the first plate of the plurality of plates includes a first channel of the plurality of channels formed in an upper surface and a second channel of the plurality of 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.
2. The method of claim 1 , wherein the removable plates are disposed on a high pressure side of the blade mold.
3. The method of claim 1 , wherein the removable plates are disposed along the trailing edge.
4. The method of claim 1 , wherein the removable plates are disposed at approximately a 4 meter spanwise position on the leading edge.
5. The method of claim 1 , wherein the first plate of the plurality of removable plates is formed to exhibit a greater rigidity than the second plate of the plurality of removable plates.
6. The method of claim 5 , wherein the first plate is approximately 5 inches wide and 48 inches long, and second plate is approximately 8 inches wide and 60 inches long.
7. The method of claim 5 , wherein the first plate remains generally planar during said removal of air.
8. The method of claim 5 , wherein the second plate conforms to a contoured geometry during said removal of air.
9. The method of claim 1 , further comprising providing tip plates, the tip plates engaging the leading and trailing edge plates.