Method for manufacturing a sharp-edged composite part for a wind turbine blade

A method of manufacturing a composite part (70) for a wind turbine blade (10), the method comprising the steps of:

• providing a mould (50) comprising a mould depression (51) with a floor surface (53) and an adjacent receiving section (54);
• providing a mould inlay (60) having an insertion section (61) and a first side (63);
• arranging the insertion section (61) of the mould inlay (60) in the receiving section (54) of the mould depression (51) so that a junction of the first side (63) of the mould inlay (60) and the floor surface (53) of the mould depression (51) forms a first mould edge (66) and so that a moulding surface (52) is formed at least by the floor surface (53) of the mould depression (51) and the first side (63) of the mould inlay (60);
• arranging a fibre material (74) on the moulding surface (52) adjacent to the junction and the first side (63) of the mould inlay (60);
• infusing the fibre material (74) with a resin (75) and curing the infused fibre material (74) to manufacture the composite part (70) having a first side including a first part edge (73), the first part edge (73) being formed by the junction of the first side (63) of the mould inlay (60) and the floor surface (53) of the mould depression (51), wherein the material of the first side (63) of the mould inlay (60) is chemically inert with the resin (75), wherein the first side (71) is configured to be mated to a first side of a spar cap for the wind turbine blade so that a first surface of the composite part (70) including the first part edge (73) and a first surface of the spar cap form a substantially continuous surface;
• and
• demoulding the composite part (70) from the mould depression (51).

A wind turbine blade shell part comprising a first composite part (70) and a second composite part (70′) and a spar cap,

• wherein a first side (71) of the first composite part (70) includes a first part edge (73) and is adhered to a first side (82) of the spar cap (80) so that a first surface (76) of the first composite part (70) including the first part edge (73) and a first surface (86) of the spar cap (80) form a substantially continuous surface, wherein the first surface (76) of the composite part (70) and the first surface (86) of the spar cap (80) are oriented towards the exterior of a wind turbine blade,
• wherein a first side (71′) of the second composite part (70′) includes a first part edge (73′) and is adhered to a second side (83) of the spar cap (80), the second side (83) of the spar cap (80) being opposite of the first side (82) of the spar cap (80) so that the first and second composite parts (70, 70′) and the spar cap (80) flare towards an end (84) of the spar cap (80) so that an exterior surface (76) of the first composite part (70) including the first part edge (73), an exterior surface (76′) of the second composite part (70′) including the first part edge (73′) and an exterior surface (86) of the spar cap (80) form a substantially continuous surface, wherein the first surface (76) of the first composite part (70), a first surface of the second composite part, and the first surface (86) of the spar cap (80) are oriented towards the exterior of the wind turbine blade.