Loop Blade Manufacturing Using Pre-Curved Workpieces
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Solution Overview
Problem
Traditional manufacturing methods for loop blades (LBs) face challenges due to their complex geometry, leading to high costs and limited material options, especially in mass production, as they struggle to effectively utilize additive manufacturing and CNC machining techniques.
Innovation Solution
Two novel methods are introduced for creating loop blades using pre-curved tubular or helical pieces and pre-cut flat sheets or bars, requiring only a single cutting or curving operation to achieve the desired helically twisted shape, leveraging commercially available materials and existing manufacturing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing methods (casting rigid alloys or CNC machining) are used to produce loop blades, then manufacturing precision can be achieved, but device complexity and manufacturing cost increase due to the complex geometry
Solution Approach 1:
The patent applies preliminary action by using pre-curved tubular or helical pieces as starting materials that are prepared in advance with the required curvature. This eliminates the need for complex multi-step machining processes while maintaining geometric precision, as the pre-curved components only require a single cutting operation to become the final loop blade shape.
Solution Approach 2:
The manufacturing process is segmented into two distinct stages: (1) pre-curved workpiece preparation (outside the control of the blade manufacturer) and (2) single cutting operation to transform into final LB shape. This segmentation simplifies the overall manufacturing complexity by separating the complex curvature formation from the final blade shaping.
2Adaptability or versatility
If additive manufacturing methods are used for loop blade production, then manufacturing flexibility and material options improve, but manufacturing cost and production time increase for mass production
Solution Approach 1:
The patent employs readily available prefabricated materials (pre-curved tubular pieces, pre-cut flat sheets, or pre-formed helical shapes) that can be obtained at low cost from standard suppliers. These inexpensive starting materials replace expensive additive manufacturing processes for mass production, while still allowing for customization through a single cutting operation that can be adjusted according to blade specifications.
3Strength
If traditional manufacturing techniques (metal casting or CNC machining) are used, then structural integrity can be maintained, but manufacturing cost and production time increase
Solution Approach 1:
The structural integrity is preserved by using pre-curved tubular or helical pieces as starting materials that are already formed with the required geometric precision and material properties. The single cutting operation required to transform these pre-formed components into final loop blades maintains structural integrity while dramatically improving production efficiency compared to traditional multi-step manufacturing processes.
Solution Approach 2:
The patent utilizes curved and helical geometries in the pre-curved workpieces and final loop blade design. The pre-curved tubular pieces and helical shapes provide inherent structural strength through their curved configurations, while the single cutting operation preserves these beneficial curvature features, thereby maintaining structural integrity without requiring complex machining processes.
Data Source
AI summary
This invention relates to methods for creating loop blades (LB) for propellers, using readily available prefabricated and pre-shaped workpieces. The proposed methods leverage existing manufacturing capabilities to simplify LB production. Two methods are disclosed.The first method utilizes pre-curved tubular or helical workpieces and a single cutting operation to create a variety of LB. Parameters from the LB specifications guide the selection and processing of the pre-curved workpieces with appropriate cutting tools.The second method employs a single curving operation on pre-cut flat sheets or bars to create LB, extended with straight wings. LB specifications determine the selection and curving parameters for the pre-cut workpieces.Both methods offer reduced production costs and faster turnaround times of LB production using commercially available components. The application outlines detailed steps for each method and illustrates potential use cases for LB in various propulsion system configurations, emphasizing their adaptability and efficiency.