Method for manufacturing a wind turbine blade and mandrel tool

By using mandrel tools and resin infusion technology, the dangers and quality control challenges in the bonding process of wind turbine blade manufacturing have been solved, resulting in lightweight and robust blade section joints and improving the safety and efficiency of the manufacturing process.

CN115666916BActive Publication Date: 2026-07-21SIEMENS GAMESA RENEWABLE ENERGY AS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SIEMENS GAMESA RENEWABLE ENERGY AS
Filing Date
2021-06-08
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In the existing technology, the gluing process in the manufacturing of wind turbine blades is dangerous and the quality of the gluing line is difficult to control, especially for large blades, where it is difficult to achieve high-quality joints.

Method used

A mandrel tool is used to arrange the fiber stack inside the blade section, and a laminated joint is formed by resin infusion. The retractable and expandable properties of the mandrel tool are used to position and cure the fiber stack, avoiding the use of traditional adhesives and providing a lighter and stronger connection.

Benefits of technology

This technology enables lightweight yet robust blade section joints, avoiding the hazards and material inhomogeneities inherent in the bonding process. It also improves the safety and efficiency of the manufacturing process, particularly by reducing the impact on other parts of the blade material through the internal joining process.

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Abstract

A method for manufacturing wind turbine blades includes the steps of: a) arranging (S1) a fiber stack (10) on a mandrel tool (11), the mandrel tool (11) including a frame (12) and at least two mandrel portions (13, 14, 15, 16) connected to the frame (12) as seen in cross-section, and wherein at least a portion of the fiber stack (10) is supported by the outer surface (19) of the at least two mandrel portions (13, 14, 15, 16); b) retracting at least one of the mandrel portions (13, 14, 15, 16) toward the frame (12). To reduce (S3) the cross-sectional dimension (S) of the mandrel tool (11); c) to arrange (S6, S7) the mandrel tool (11) inside adjacent blade sections (8, 9); d) to increase (S8) the cross-sectional dimension (S) of the mandrel tool (11) by extending at least one of the mandrel portions (13, 14, 15, 16) away from the frame (12); and e) to infuse (S9) at least a portion of the fiber laminate (10) with resin (70) and cure the resin (7) to obtain a cured connection portion (71) that internally connects the blade sections (8, 9). Reducing the cross-sectional dimension of the mandrel tool allows for better insertion of the mandrel tool through the outer end of the inner blade section.
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