Thrust Reverser Cascade Overmolding Manufacturing
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Solution Overview
Problem
The fabrication of composite thrust reverser cascades for aircraft engines is time-consuming, labor-intensive, and expensive, requiring specialized equipment and many processing steps.
Innovation Solution
A method of manufacturing thrust reverser cascades using overmolding, where a first portion comprising reinforcement fibers in a thermoplastic matrix is thermoformed and a second portion with vanes is overmolded onto the first portion, with the majority of reinforcement fibers in the first portion being woven and longer than those in the second portion, which are variably oriented.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If composite materials are used to fabricate thrust reverser cascades, then aerodynamic performance is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple manufacturing operations into a single integrated overmolding process. The frame and multiple vanes are manufactured together in one cycle, eliminating sequential assembly steps. This merging of operations maintains the aerodynamic benefits of composite materials while dramatically reducing manufacturing complexity and cycle time.
Solution Approach 2:
The patent utilizes fiber-reinforced thermoplastic composite materials for both the frame and vanes. The frame uses long continuous fibers for structural strength, while the vanes use short chopped fibers for aerodynamic surfaces. This composite material approach maintains high aerodynamic performance while enabling a more efficient manufacturing process through overmolding.
2Strength
If traditional composite fabrication methods are used, then structural strength is achieved, but production time and labor intensity increase
Solution Approach 1:
The overmolding process merges the manufacturing of the frame and all vanes into a single integrated operation. While the frame requires long continuous fibers for structural strength, the vanes can be manufactured simultaneously using short chopped fibers. This consolidation maintains necessary structural integrity while eliminating multi-step assembly processes that reduce productivity.
Solution Approach 2:
The patent changes the fiber length parameter between different components - using long continuous fibers for the structurally critical frame and short chopped fibers for the vanes. This parameter optimization allows the frame to maintain structural strength requirements while enabling the overmolding process to manufacture both components in one cycle, significantly improving production efficiency.
3Manufacturing precision
If multiple processing steps are used in composite fabrication, then manufacturing precision is maintained, but process complexity and cost increase
Solution Approach 1:
The overmolding process combines multiple manufacturing steps into a single integrated operation where the frame and all vanes are formed simultaneously in one mold cycle. This merging maintains dimensional precision through controlled molding parameters while eliminating the need for multiple separate processing steps, toolings, and assembly operations that increase process complexity.
Solution Approach 2:
The frame is prepared in advance with specific surface features and geometry that are designed to receive the overmolded vanes. This preliminary preparation of the frame with integrated mold features ensures that when the vanes are overmolded onto it, precise dimensional relationships are achieved without requiring post-processing or separate assembly steps, thereby maintaining manufacturing precision while reducing process complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces complexity, time, and cost while improving process repeatability, resulting in a more efficient and cost-effective production of thrust reverser cascades with improved aerodynamic performance.
Implementation Method 1
providing a first portion of the thrust reverser cascade; wherein the first portion comprises reinforcement fibers in a thermoplastic matrix
Implementation Method 2
overmolding a second portion of the thrust reverser cascade onto the first portion, the second portion including one or more vanes of the thrust reverser cascade
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A thrust reverser cascade of an aircraft engine comprises a frame and a vane overmolded onto the frame. The frame and the vane each comprise reinforcement fibers in a thermoplastic matrix. A method is disclosed for manufacturing the thrust reverser cascade or another part comprising an aerodynamic surface configured to interact with a flow of fluid. The method comprises providing a first portion of the part and overmolding a second portion of the part onto the first portion where the second portion includes the aerodynamic surface.