Interlinked Coiled Spring Structures With Controlled Feature Separation
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Solution Overview
Problem
Additive manufacturing techniques face challenges in generating small-scale flexible structures with precise control over feature size and separation, as the minimum 'printable' feature size is limited by the temperature reached during the fusing process, which can result in unintended fusion of small elements.
Innovation Solution
The use of fusing agents and detailing agents with controlled application to manage temperature differentials between regions, allowing for the generation of small-scale flexible structures with specific properties by adjusting the density and distribution of these agents to prevent unwanted fusion and achieve desired flexibility and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heating is applied to solidify build material in additive manufacturing, then the build material solidifies to form the desired structure, but small elements may unintentionally fuse due to temperature spread
Solution Approach 1:
The patent applies different properties to different regions by using detailing agents with specific thermal characteristics in targeted areas. These agents modify the local thermal response of the build material, allowing small elements to resist unwanted fusion while maintaining the desired solidification in other regions. This local differentiation resolves the contradiction between achieving precise feature size control and preventing unintended fusion caused by temperature spread.
Solution Approach 2:
The detailing agents act as intermediaries between the heating source and the build material. These agents are applied to specific regions and modify the thermal interaction, creating a buffer that prevents excessive temperature spread to adjacent small elements. This intermediary layer enables precise control over which areas solidify and which remain separated, resolving the fusion issue while maintaining manufacturing precision.
2Manufacturing precision
If the minimum printable feature size is reduced to create small-scale structures, then more detailed flexible structures can be generated, but control over feature separation becomes difficult
Solution Approach 1:
The patent assigns different thermal properties to different regions through selective application of detailing agents. In regions where feature separation is critical, agents with thermal resistance properties are applied to prevent heat spread. In other regions, standard solidification properties are maintained. This local quality differentiation enables precise feature separation control even at small scales without requiring complex global temperature control systems.
Solution Approach 2:
The patent modifies thermal parameters (such as thermal conductivity and heat capacity) by introducing detailing agents with specific thermal characteristics. By changing these parameters locally, the system achieves better control over feature separation at small scales. The detailing agents effectively adjust the thermal response of the build material in targeted areas, resolving the contradiction between creating detailed small-scale structures and maintaining feature separation control.
3Reliability
If more build material is used to ensure complete solidification, then solidification is more reliable, but material usage increases
Solution Approach 1:
The patent applies detailing agents to specific regions where solidification reliability is critical, rather than uniformly treating the entire build area. This localized approach ensures reliable solidification only where needed, preventing unnecessary material usage in regions where complete solidification is not required. The detailing agents enhance the thermal response of build material in targeted areas, achieving reliability optimization with minimal material consumption.
Solution Approach 2:
The patent applies detailing agents selectively to regions requiring enhanced solidification control, rather than applying them universally. This partial action approach ensures that material usage is optimized by focusing thermal management resources only where necessary for reliable solidification. The detailing agents provide the needed thermal control in critical areas without requiring excessive material or energy input across the entire build volume.
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 enables the creation of flexible structures with precise control over feature size and separation, enhancing their compressibility and flexibility while minimizing material usage, as demonstrated by structures with measured rigidity and compressibility values.
Implementation Method 1
The fusing agent may have a composition which absorbs energy such that, when energy (for example, heat) is applied to the layer, the build material to which it has been applied heats up, coalesces and solidifies
Implementation Method 2
a detailing agent may be used near edge surfaces of an object being printed to reduce coalescence, and to assist with controlling object dimensions by preventing surrounding build material from fusing
Data Source
AI summary
In an example, a flexible structure comprises a plurality of interlinked spring units. Each spring unit may comprise at least three coaxial coiled springs, and each spring of a spring unit may comprise a first end and second end. In some examples, an end of one spring adjoins an end of a spring of an adjacent spring unit.