Kinematic Coupling for Additive Manufacturing Precision
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Solution Overview
Problem
Additive manufacturing (AM) techniques face challenges in achieving precise and consistent location of components for post-processing and assembly due to limitations in dimensional accuracy, surface finishes, and material properties, leading to potential assembly issues and performance degradation.
Innovation Solution
Fabricating kinematic interfaces during the AM process allows for the formation of kinematic couplings that enable precise location of components with respect to post-processing tools or other components, using features like hemispheres and v-shaped grooves, and employing deformation or reformation treatments to enhance accuracy and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additive manufacturing is used to produce components, then manufacturing flexibility and complexity are improved, but manufacturing precision and dimensional accuracy deteriorate
Solution Approach 1:
The component is segmented into multiple sections with distinct functions: the body portion contains the kinematic interface features (hemispheres, v-grooves) that provide precision locating, while the rest of the component can be additively manufactured with standard tolerances. This segmentation allows the precision-critical features to be created with high accuracy while maintaining the flexibility of additive manufacturing for the overall component geometry.
Solution Approach 2:
The kinematic interface features (hemispheres and v-grooves) are pre-formed during the additive manufacturing process itself, rather than requiring subsequent precision machining. This preliminary action ensures that the precision locating features are built-in with consistent dimensions and surface finishes, resolving the dimensional accuracy issue while maintaining additive manufacturing flexibility.
2Manufacturing precision
If post-processing is performed on additively manufactured components, then component quality is improved, but time and cost increase
Solution Approach 1:
The kinematic interface features are preliminary formed during the additive manufacturing process with appropriate surface finishes and dimensional accuracy. This eliminates or minimizes the need for subsequent precision machining or post-processing of these critical features, significantly reducing post-processing time and cost while maintaining component quality.
Solution Approach 2:
The additive manufacturing process itself is made to produce the precision kinematic interface features without requiring external post-processing operations. The process serves its own precision requirements by building in the hemispheres and v-grooves with sufficient accuracy during fabrication, eliminating the need for separate machining operations.
3Manufacturing precision
If conventional fixturing is used for additively manufactured components, then location accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The component itself provides the locating function through its built-in kinematic interface features (hemispheres and v-grooves) that engage with complementary features on the fixture or assembly partner. The component serves its own locating requirement without requiring complex external fixturing systems, reducing device complexity and cost while maintaining location accuracy.
Solution Approach 2:
Instead of using complex fixturing to locate the component, the component is designed with locating features that actively engage with the fixture or assembly partner. The inversion is in the approach: rather than the fixture imposing location on the component, the component's own features create the locating relationship, simplifying the overall system.
4Adaptability or versatility
If assembly of multiple components is performed, then functional complexity is improved, but placement accuracy deteriorates
Solution Approach 1:
The assembly system is segmented into multiple components, each containing kinematic interface features (hemispheres or v-grooves) that provide precise relative location. This segmentation allows complex functionality to be achieved through assembly while maintaining placement accuracy through the kinematic coupling of individual components.
Solution Approach 2:
The use of spherical features (hemispheres) and complementary v-grooves creates kinematic couplings that provide precise spherical-point contact between components. This curved geometry enables accurate placement and orientation of assembled components through inherent geometric constraints, maintaining placement accuracy while achieving functional complexity.
Data Source
AI summary
Methods, systems, and devices for precision locating additively manufactured components for assembly and/or post processing manufacturing are provided for herein. In some embodiments, at least one component can be additively manufactured to include one or more kinematic features on one or more surfaces of the component. The kinematic feature(s) can be configured to engage complementary kinematic feature(s) formed in a second component so the two components can form an assembly. Alternatively, the kinematic feature(s) can be configured to engage complementary kinematic feature(s) associated with a post-processing machine such that the one or more post-processing actions can be performed on the component after the component is precisely located with respect to the machine by way of the kinematic features of the component and associated with the machine. A variety of systems and methods that utilize kinematic features are also provided.