Removable PBF Support Structures Using Inductive Breakaway
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Solution Overview
Problem
Conventional techniques for addressing overhangs in powder-bed fusion (PBF) systems using support structures have significant drawbacks, such as affecting the quality of the resulting structures and being difficult to remove without damaging the build piece.
Innovation Solution
A method and apparatus for additively manufacturing components using conductive support materials coupled to inductive elements, where the inductive elements generate a magnetic field to break the support material from the component, and the support material is tapered at the point of contact to facilitate removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional support structures are used to address overhangs in PBF systems, then the quality of resulting structures is improved, but the support structures are difficult to remove without damaging the build piece
Solution Approach 1:
The support structure is divided into two distinct segments: a conductive support material portion that contacts the build piece, and a non-conductive support material portion that extends to the build plate. This segmentation allows selective removal of the conductive portion through electromagnetic induction while preserving the build piece, resolving the contradiction between providing adequate support and enabling easy removal.
Solution Approach 2:
The conductive support material acts as an intermediary between the build piece and the build plate, allowing electromagnetic energy to be applied for selective removal. This intermediary material enables the build piece to be separated from the support structure without direct mechanical contact that could cause damage, thus improving ease of removal while maintaining manufacturing precision.
2Strength
If support structures are used to mitigate overhang effects, then structural integrity during manufacturing is improved, but the removal process requires significant time and energy
Solution Approach 1:
The mechanical removal process is replaced with an electromagnetic induction system. An induction heating element applies electromagnetic energy to the conductive support material, causing it to heat up and break away from the build piece. This substitution eliminates time-consuming mechanical removal processes while maintaining structural integrity during manufacturing.
Solution Approach 2:
The physical state of the conductive support material is changed through electromagnetic induction heating. By controlling the temperature parameter of the conductive material, the support structure can be selectively removed without affecting the build piece. This parameter change enables rapid removal while preserving structural integrity during the manufacturing process.
3Stability of the object's composition
If conventional support structures are used, then overhang support is provided, but the support structures may damage the build piece during removal
Solution Approach 1:
The harmful conductive support material is extracted from the combined support structure through electromagnetic induction. By selectively heating and removing only the conductive portion, the build piece is separated from the support structure without mechanical contact that could cause damage. This extraction process eliminates harmful factors while maintaining overhang support stability during manufacturing.
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 solution effectively removes support structures from build pieces without damaging them, improving the quality of the final structures and reducing the time and energy required for support removal.
Implementation Method 1
The at least one inductive element is energized to generate a second magnetic field
Implementation Method 2
The support material can be tapered at a point of contact to the component to facilitate removal of the support material
Data Source
AI summary
Systems and methods of support structures in powder-bed fusion (PBF) are provided. Support structures can be formed of bound powder, which can be, for example, compacted powder, compacted and sintered powder, powder with a binding agent applied, etc. Support structures can be formed of non-powder support material, such as a foam. Support structures can be formed to include inductive components that can be used to facilitate removal of the support structures in the presence of an external magnetic field. Additionally, support structures can be formed to break when a fluid, such as air or water, creates a force and/or pressure at a connection point interface.