Mold for near-net-shaping of ceramic matrix composite band crown turbine rotor blade

By using graphite-based molds and an open-type clamping method, the shape and size issues of crowned turbine rotor blades made of ceramic matrix composites during the forming process were solved, achieving high-quality near-net-shape forming and efficient production to meet the performance requirements of aero-engines.

CN117656220BActive Publication Date: 2026-07-10NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2023-12-13
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

The lack of effective molds for near-net-shape forming of crowned turbine rotor blades made of ceramic matrix composites in the current technology makes it difficult to guarantee the shape and size of the turbine rotor blades during the manufacturing process. They are prone to warping, twisting and bending, which affects product quality and production efficiency.

Method used

The tenon module, blade module, and blade crown module are made of graphite material. The turbine rotor blade prefabrication is fixed by graphite long bolts and graphite locking nuts, providing an open clamping method to ensure module positioning and accurate fit, avoiding warping and wrinkling.

Benefits of technology

Near-net-shape forming of crowned turbine rotor blades made of ceramic matrix composites has been achieved, which improves the manufacturing quality and production efficiency, ensures minimal machining of the blade surface, and meets the high temperature and weight requirements of aero-engines.

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Abstract

This invention discloses a near-net-shape mold for crowned turbine rotor blades made of ceramic matrix composite materials, mainly composed of a tenon module, a blade body module, and a crown module. The tenon module has a cavity A that mates with the tenon structure of the blade preform, and the blade body module has a cavity B that mates with the blade body structure of the blade preform. The tenon module and blade body module are provided with positioning pin holes to ensure accurate mutual fit. Thinner preform structures such as the rim plate and crown are fixed using an open-type fixing method, avoiding warping and wrinkling of the fiber cloth during mold closing. The crown module and blade body module are provided with positioning mounting holes to ensure accurate mutual fit. Long bolts and lock nuts are used to tighten and compact the preforms to ensure that the blade profile meets requirements. This invention allows for rapid disassembly and assembly, effectively achieving near-net-shape forming of crowned turbine rotor blades made of ceramic matrix composite materials and improving the yield rate.
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