Turbomachine Blade Molding Unit Reinforcing Protuberance
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Solution Overview
Problem
The mechanical strength of molding assemblies for turbomachine engine blades is unsatisfactory, particularly in the region forming cooling slots, which constitutes a fragile zone.
Innovation Solution
A molding assembly with a reinforcing protuberance forming the downstream opening of the tub, where the protuberance has a greater cross-sectional area and height than the strips, and is oriented to reduce torsional forces, enhancing mechanical strength and airflow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the molding assembly uses bars with small cross-sectional area to form cooling slots, then the cooling airflow distribution is improved, but the mechanical strength of the molding assembly deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the cross-sectional dimensions of different bars in the molding assembly. The first bar (forming the downstream opening) has a larger cross-sectional area than the second bar (forming cooling slots), allowing each bar to be optimized for its specific function: the first bar provides structural strength while the second bar enables proper cooling airflow distribution.
2Strength
If the molding assembly uses a raised portion with large cross-section to form the downstream opening, then the mechanical strength is improved, but the device complexity increases
Solution Approach 1:
The patent merges the function of the raised portion forming the downstream opening with the structural reinforcement function. The first bar with its specific cross-sectional dimensions serves dual purposes: it forms the downstream opening geometry while simultaneously providing the necessary mechanical strength to the molding assembly, thereby reducing overall device complexity.
Data Source
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AI summary
The invention relates to a moulding unit (210) for producing a turbomachine blade blank. The moulding unit (210) has an upstream portion (270) and a downstream portion (280). According to the invention, the moulding unit (210) comprises a raised portion (231) designed to form a downstream opening which, at the level of the trailing edge, passes through at least one of the side edges of the basin-like portion at the blade tip. The raised portion (231) rigidly secures the upstream portion (270) to the downstream portion (280) and comprises a strengthening protuberance extending in the transverse direction.