3D-Printed Helical Bellows for Fast Custom Geometry Iteration
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Solution Overview
Problem
Traditional manufacturing methods for bellows are inefficient, leading to long lead times and difficulty in modifying bellows geometry for specific applications due to expensive and inflexible tooling, limiting design flexibility and adaptability.
Innovation Solution
The use of additive manufacturing, such as Laser Powder Bed Fusion, allows for the creation of complex bellows geometries with varying shapes and wall thicknesses, enabling quick design iterations and customization by forming parts layer by layer without fixed forming tools, resulting in optimized bellows geometries for propulsion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional manufacturing methods are used, then manufacturing precision and structural integrity can be achieved, but lead times are long and design flexibility is limited
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional manufacturing parameters (fixed tooling, standardized geometries) to additive manufacturing parameters (layer-by-layer deposition, variable wall thickness, complex convolution shapes). This enables rapid design iterations and customization without expensive retooling, directly resolving the contradiction between improved productivity and maintained design flexibility
Solution Approach 2:
The patent replaces the mechanical tooling system with a digital modeling and additive manufacturing system. Instead of physical molds and forming tools that require expensive modifications for design changes, the invention uses computer-aided design models that can be rapidly updated and printed, achieving both faster lead times and enhanced design adaptability
2Adaptability or versatility
If conventional bellows manufacturing is used, then standard geometries can be produced, but customization and design iterations are difficult and expensive
Solution Approach 1:
The patent utilizes parameter changes inherent in additive manufacturing to achieve design customization. Wall thickness, convolution geometry, and bellows dimensions can be varied continuously through digital model modifications without increasing manufacturing complexity. The layer-by-layer deposition process naturally accommodates complex geometries that would be difficult or expensive to manufacture conventionally
Solution Approach 2:
The patent exploits the third dimension in additive manufacturing to create complex internal and external geometries. Convolution shapes, wall thickness variations, and structural features can be defined in all three spatial dimensions through digital modeling, enabling customization without proportionally increasing manufacturing complexity as would occur with conventional multi-step forming processes
3Shape
If additively manufactured bellows are produced, then design freedom and packaging efficiency are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces complex mechanical manufacturing processes with a streamlined additive manufacturing process. The layer-by-layer deposition method consolidates multiple forming operations into a single manufacturing step, reducing overall process complexity despite the sophistication of the resulting geometries. Digital modeling provides precise control over bellows shape without requiring complex tooling or multi-step fabrication sequences
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 approach reduces lead times, increases design freedom, and allows for the production of bellows with enhanced flexibility and packaging efficiency, accommodating various applications with fewer parts and improved performance.
Implementation Method 1
The use of additive manufacturing, such as Laser Powder Bed Fusion, allows for the creation of complex bellows geometries with varying shapes and wall thicknesses, enabling quick design iterations and customization by forming parts layer by layer without fixed forming tools
Data Source
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AI summary
A bellows assembly (500) includes a first connecting portion, a second connecting portion spaced apart from the first connecting portion along a longitudinal axis (524), and at least one helix convolution (520). The helix convolution is formed between the first connecting portion and the second connecting portion and is configured to provide compliance such that the first connecting portion moves relative to the second connecting portion. The helix convolution portion extends circumferentially around and along the longitudinal axis and has a first section with a first angle (540) relative to a lateral axis (542) that is perpendicular to the longitudinal axis.