AM Substrate Fixture Layout for Thermal Distortion Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Additive Manufacturing (AM) processes face challenges with substrate distortion due to thermal residual stresses, leading to deformation and potential build failure, especially in large-scale metallic components, where conventional solutions increase system complexity and alter cooling rates.
Innovation Solution
A substrate fixture system with strategically positioned slots and fasteners allows for controlled thermal expansion and contraction, minimizing distortion by applying forces less than 60 Nm, and featuring a cruciform configuration with oversized holes for flexible attachment to a frame, enabling two-dimensional movement while restraining out-of-plane deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a heated sintering chamber or heated substrate is used to reduce substrate distortion, then substrate distortion is reduced, but system complexity increases and cooling rates of the sintered material are changed
Solution Approach 1:
The substrate is segmented into multiple regions with different thermal properties. The fixture system divides the substrate support into discrete zones that can independently manage thermal expansion, allowing distortion reduction without heating the entire chamber or substrate uniformly.
Solution Approach 2:
The fixture system acts as an intermediary between the substrate and the build platform. It introduces compliant elements and adjustable support structures that mediate thermal stresses, reducing substrate distortion without requiring thermal management system modifications.
2Manufacturing precision
If the substrate is rigidly fixed to prevent deformation, then manufacturing precision is maintained, but thermal residual stresses increase causing build failure
Solution Approach 1:
The fixture system transitions from rigid fixation to dynamic, adaptive support. The support structures can adjust their stiffness and position in response to thermal stresses, maintaining substrate stability while allowing controlled movement to relieve residual stresses and prevent build failure.
Solution Approach 2:
The system changes the mechanical parameters of the substrate support, transitioning from fixed rigid constraints to compliant, adjustable support conditions. This allows the substrate to accommodate thermal expansion while maintaining positional stability for precise manufacturing.
3Device complexity
If conventional fixture systems are used, then substrate distortion occurs, but system complexity remains low
Solution Approach 1:
The fixture system incorporates self-adjusting mechanisms that automatically compensate for thermal expansion and contraction. The compliant support structures and adjustable elements self-regulate to maintain substrate stability without requiring complex external control systems, achieving distortion reduction with minimal added complexity.
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
The system effectively reduces substrate distortion and buckling, improving build quality and reliability in large-scale AM processes, particularly for metallic components, by allowing controlled thermal expansion and contraction while preventing significant out-of-plane movement.
Implementation Method 1
The thermal energy involved in sintering the powder or wire tends to result in residual stresses in the article which tend to cause the article to deform
Data Source
AI summary
A system comprising: a substrate; a fixture for receiving the substrate; and four fasteners. The substrate has two axes, and a build surface. The substrate comprises four slots through the substrate from the build surface to an opposite surface. Lengths of first and second slots are aligned along a first axis. The first and second slots are at opposite sides of the build surface to each other. Lengths of the third and fourth slots are aligned along the second axis. The third and fourth slots are at opposite sides of the build surface to each other. The fasteners fit through respective slots. The lengths of the slots are greater than diameters of portions of the fasteners that are positioned through the slots.