Apparatus and method for producing a rotor blade spar cap
View Patent ↗An apparatus and method for producing a rotor blade spar cap for a rotor blade of a wind turbine. The apparatus includes a mold, which has a cavity-like depression in cross section, in which material for a rotor blade spar cap can be placed, and a sheet-like mold covering for sealing off the depression. The depression has side walls, an opening bounded by the side walls and a base area between the side walls. In accordance with the method, fiber material and/or fiber-reinforced material is placed in the depression of the mold such that the material finishes flush with the side walls with respect to the height of the rotor blade spar cap, the depression is sealed off by the sheet-like mold covering, the material is fused together to form the rotor blade spar cap and the rotor blade spar cap is removed from the mold.
1. An apparatus for producing a rotor blade spar cap for a rotor blade of a wind turbine, comprising:
a mold, which in cross section, includes a depression having a base area for placement of fiber material and/or fiber-reinforced material to be fused together with liquid resin feed material to form the rotor blade spar cap;
at least one removable guide body placed on the mold, said at least one removable guide body forming at least a portion of a side wall of the depression; and
a mold covering sheet for sealing off the depression;
wherein a height of the side wall of the depression is the same as a height of a side of the rotor blade spar cap to be formed in the depression,
wherein a feed channel is formed in the mold below the base area of the depression,
wherein the feed channel is covered by a channel covering sheet that is permeable to the liquid resin feed material and flush with the base area of the depression, and
wherein a suction pipe or a suction channel is arranged between the mold covering sheet and the fiber material and/or fiber-reinforced material to be fused together with the liquid resin feed material to form the rotor blade spar cap.
2. The apparatus as claimed in claim 1 , wherein the feed channel is arranged on one side of the depression and the suction pipe or suction channel is arranged on a side of the depression that lies diagonally opposite the feed channel in the cross section of the depression.
3. The apparatus as claimed in claim 1 , further comprising a flow promoter, which is arranged on the channel covering sheet and on the base area of the depression in a direction toward an opposite side wall.
4. The apparatus as claimed in claim 1 , further comprising a semipermeable membrane, which is arranged under the mold covering sheet, wherein the membrane is sealed off with respect to the mold covering sheet, and wherein the membrane and the mold covering sheet enclose the suction pipe or the suction channel between them.
5. A method for producing a rotor blade spar cap for a rotor blade of a wind turbine, comprising:
providing the apparatus according to claim 1 ;
placing fiber material and/or fiber-reinforced material in the depression such that the fiber material and/or the fiber-reinforced material is flush with the height of the side wall of the depression;
sealing off the depression with the mold covering sheet;
fusing together the fiber material and/or of the fiber-reinforced material placed in the depression with liquid resin feed material to thereby form the rotor blade spar cap;
removing the guide body placed on the mold; and
demolding of the rotor blade spar cap from the mold.
6. The method as claimed in claim 5 , wherein the fiber material and/or fiber-reinforced material comprises dry fiber fabrics, prepreg fiber materials and/or pultruded rods of fiber-reinforced material.
7. The method according to claim 5 , wherein further material layers selected from the group consisting of peel plies, perforated films and absorbent nonwovens are arranged under and/or over the material of the rotor blade spar cap.
8. The method as claimed in claim 5 , wherein, at a leading edge and/or a trailing edge of the rotor blade spar cap, bodies of a core material are first inserted into the depression, and then the fiber material and/or the fiber-reinforced material is placed between said bodies.
9. The method as claimed in claim 8 , wherein the core material is balsa or foam.
10. The method as claimed in claim 5 , wherein the fusing together of the fiber material or of the fiber-reinforced material in the depression takes place by means of infusion of the liquid resin feed material, which flows in through the feed channel below the base area of the depression.
11. The method as claimed in claim 10 , wherein the feed channel is provided on one side of the base area.
12. The method as claimed in claim 5 , wherein material layers that remain as an outer layer of the rotor blade spar cap after demolding of the rotor blade spar cap following its production are placed in the depression, flush with the side walls, in the placing step.
13. A rotor blade spar cap for a rotor blade of a wind turbine produced by the method according to claim 5 .