Additive Manufacturing Distortion Reduction via Homogeneous Shrinking Supports
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Solution Overview
Problem
In three-dimensional printing of metal parts, overhanging or cantilevered portions often require removable supports to prevent deformation and maintain shape accuracy, but existing methods struggle with uniform shrinking and distortion reduction during the sintering process.
Innovation Solution
A method involving the formation of debindable matrices with shrinking supports and a sliding release layer, allowing for uniform shrinking of the part and supports, and the use of soluble or ceramic particulate-filled support structures to minimize distortion, with a process that includes debinding and sintering in a controlled manner to maintain dimensional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If removable supports are used to prevent deformation of overhanging portions, then shape accuracy is improved, but uniform shrinking during sintering deteriorates
Solution Approach 1:
The patent applies homogeneity by making the support structures from the same composite material as the desired part. This ensures that both the part and supports shrink at the same rate during sintering, achieving uniform shrinking while maintaining shape accuracy. The support structures and part are essentially identical in material composition, creating a homogeneous system that shrinks uniformly.
Solution Approach 2:
The patent segments the support structures into two types: soluble supports that dissolve during debinding and sintering supports that remain and shrink uniformly with the part. This segmentation allows different support functions to be achieved while resolving the contradiction between shape support and uniform shrinking.
2Ease of operation
If soluble support structures are used, then ease of removal is improved, but shape retention during debinding deteriorates
Solution Approach 1:
The patent segments support structures into soluble and non-soluble components. Soluble supports are used in regions where easy removal is critical, while sintering supports made from the same composite material are used where shape retention is critical. This segmentation allows each type of support to optimize its specific function without compromising the other.
Solution Approach 2:
The patent applies local quality by using different support materials in different locations based on functional requirements. Soluble supports are placed where they can be easily removed without affecting critical features, while sintering supports are placed where they need to maintain shape accuracy during the sintering process.
3Ease of operation
If traditional release layers are used, then ease of part removal is improved, but distortion reduction deteriorates
Solution Approach 1:
The patent replaces traditional release layers with a sliding release layer made from the same composite material as the part. This homogeneous material composition ensures that the release layer shrinks uniformly with the part during sintering, reducing distortion while still providing the necessary release function for easy part removal.
Solution Approach 2:
The patent changes the material parameters of the release layer to match the composite material of the part, rather than using a dissimilar traditional release layer material. This parameter change ensures compatible thermal and shrinkage behavior, reducing distortion while maintaining ease of removal.
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 effectively reduces distortion in additively manufactured parts by ensuring uniform shrinking and easy removal of supports, maintaining the shape accuracy and integrity of the printed metal parts.
Implementation Method 1
heated to shrink all of the shrinking platform, the shrinking supports, and the desired part together at a same rate as neighboring metal particles throughout the shape-retaining brown part assembly undergo atomic diffusion
Implementation Method 2
The shape-retaining brown part assembly is sintered to shrink at a rate common throughout the shape-retaining brown part assembly
Implementation Method 3
The sliding release layer reduces lateral resistance between the shrinking platform and the underlying surface
Data Source
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AI summary
To reduce distortion in an additively manufactured part (14), a shrinking platform (RA1) is formed from a metal particulate filler in a debindable matrix. Shrinking supports (SS1) of the same material are formed above the shrinking platform, and a desired part of the same material is formed upon them. A sliding release layer (SL1) is provided below the shrinking platform of equal or larger surface area than a bottom of the shrinking platform to lateral resistance between the shrinking platform and an underlying surface. The matrix is debound sufficient to form a shape-retaining brown part assembly including the shrinking platform, shrinking supports, and the desired part. The shape-retaining brown part assembly is heated to shrink all of the components together at a same rate via atomic diffusion.