AM Part Retention Features for Precise Adhesive Bonding
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Solution Overview
Problem
In additive manufacturing, the application of adhesives often results in positive pressure that can misalign or separate parts during bonding, and the expansion of adhesives during curing can lead to improper connections, especially in complex geometries and large components, limiting the precision and reliability of 3D printed structures.
Innovation Solution
The use of adhesive-based part retention features, such as nodes with integrated retention elements and mechanical structures, which provide temporary or permanent retention during adhesive application and curing, ensuring accurate alignment and secure bonding between additively manufactured parts and other components, including COTS parts, by using quick-curing adhesives like hot melt or UV-cured materials, and mechanical features like snap-fits or grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to bond parts together, then bonding strength is improved, but positive pressure from the adhesive causes misalignment or separation of parts
Solution Approach 1:
The patent applies preliminary anti-action by incorporating retention features (such as mechanical interlocks, retention elements, or geometric constraints) into the part designs before adhesive application. These features preemptively counteract the separating force generated by adhesive positive pressure, preventing misalignment or separation from occurring in the first place during the bonding process
Solution Approach 2:
The retention features act as intermediaries between the parts and the adhesive bonding process. They provide a mechanical mediation system that maintains part positioning while the adhesive cures, decoupling the alignment function from the bonding function and allowing the adhesive to focus on providing bonding strength without causing misalignment
2Strength
If adhesive expands during curing, then bonding strength is improved, but expansion leads to improper connections and misalignment
Solution Approach 1:
The retention features are designed to preemptively counteract the expanding force of curing adhesive. By incorporating mechanical constraints or interlocks before curing begins, the system prevents expansion-induced misalignment from occurring, allowing the adhesive to fully expand and cure without compromising connection accuracy
Solution Approach 2:
The bonding system is segmented into two independent functions: the retention features handle positioning and alignment, while the adhesive handles bonding strength. This segmentation allows each component to optimize its function without interfering with the other, particularly during the curing expansion phase
3Manufacturing precision
If strict tolerance is required for adhesive connection, then connection accuracy is improved, but production complexity and time increase
Solution Approach 1:
The retention features incorporate alignment and positioning functions directly into the part geometries during the additive manufacturing process. This preliminary action establishes accurate part alignment before assembly, eliminating the need for slow, precision-adjustment procedures during final assembly and significantly improving production speed while maintaining connection accuracy
4Adaptability or versatility
If additive manufacturing is used to create complex structures, then design flexibility is improved, but production volume decreases due to slower printing speeds
Solution Approach 1:
The system segments the manufacturing process into two phases: complex structures are additively manufactured with integrated retention features for high design flexibility, while simple, high-volume components are produced using conventional high-speed manufacturing methods. This segmentation allows each process to operate in its optimal performance range
Solution Approach 2:
The additive manufacturing process is enhanced by automatically incorporating retention features directly into the printed parts during the printing process itself. This self-service approach eliminates the need for separate post-processing steps to add retention elements, maintaining design flexibility while reducing overall production time and increasing effective production 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 ensures precise and repeatable bonding of complex structures by maintaining part alignment during adhesive application and curing, reducing the risk of misalignment and failure, and allows for more compact and efficient manufacturing processes without the need for extensive post-processing.
Implementation Method 1
The secondary connection includes a first adhesive configured to secure the first AM part and the second part
Implementation Method 2
quick-curing adhesives like hot melt or UV-cured materials
Implementation Method 3
UV-cured materials
Data Source
AI summary
Systems and methods for adhesive-based part retention features in additively manufactured structures are disclosed. A structure includes a first AM part configured to connect to a second part via a primary connection applied to an interface between the first AM part and the second part. The structure includes at least one retention element including a secondary connection. The secondary connection includes a first adhesive configured to secure the first AM part and the second part. The secondary connection may be located to provide a connection between the first AM part and the second part.