Rotating Build Platform for Uniform Powder Bed Fusion Layers
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Solution Overview
Problem
Existing additive manufacturing techniques face challenges in achieving consistent powder layer thickness across the build envelope, leading to dimensional inaccuracies and reduced mechanical properties of the final product due to repetitive errors in powder distribution.
Innovation Solution
The method involves rotating the support structure at a predetermined angle before applying each powder layer, changing the angle relative to the powder distributor, which helps distribute errors evenly and prevents accumulation of powder distribution errors, allowing for more precise and homogeneous powder layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the support structure remains stationary during powder layer application, then the manufacturing process is simpler and faster, but powder distribution errors accumulate repetitively leading to dimensional inaccuracies
Solution Approach 1:
The support structure is rotated by a predetermined angle after each layer formation, transforming the static manufacturing process into a dynamic one. This rotation changes the spatial relationship between the powder distributor and the build area, preventing repetitive powder distribution errors from accumulating in the same locations, thereby improving dimensional accuracy without requiring complex real-time adjustment mechanisms
Solution Approach 2:
The support structure undergoes periodic rotation at predetermined intervals (after each layer or set of layers). This periodic angular displacement creates varying powder distribution patterns across layers, distributing errors evenly rather than allowing them to stack up, thus enhancing manufacturing precision through a simple periodic motion
2Manufacturing precision
If the powder distributor maintains a fixed angle relative to the build area, then the system is easier to control, but dimensional inaccuracies occur due to cumulative powder distribution errors
Solution Approach 1:
Instead of making the powder distributor complex and adjustable, the invention dynamically rotates the support structure. This approach achieves varying relative angles between the powder distributor and build area while keeping the powder distributor itself simple and fixed, maintaining ease of operation while improving layer thickness consistency
Solution Approach 2:
The rotation creates different local conditions for powder distribution in different layers. Each layer receives powder at a different angular orientation, ensuring that local powder distribution variations do not repeat across layers, thereby achieving consistent layer thickness through spatial variation rather than complex control
3Manufacturing precision
If the support structure is rotated at every layer, then powder distribution errors are distributed evenly, but the manufacturing time increases due to additional rotation steps
Solution Approach 1:
The support structure rotates periodically after predetermined layers rather than after every single layer. This periodic rotation is sufficient to distribute powder distribution errors evenly across the build, while reducing the frequency of rotation operations to maintain acceptable manufacturing speed, thus balancing precision and productivity
Solution Approach 2:
Instead of rotating after every layer (excessive action), the invention rotates after predetermined intervals (partial action). This partial rotation frequency is sufficient to achieve error distribution benefits without the full time penalty of rotating after each layer, optimizing the balance between manufacturing precision and productivity
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 enhances the yield and quality of the manufactured parts by reducing dimensional inaccuracies and improving mechanical properties by ensuring consistent powder distribution across multiple layers.
Implementation Method 1
a laser beam source for delivering energy to the powder whereby fusion of the powder takes place
Implementation Method 2
lowering the support structure a predetermined distance and rotating the support structure a predetermined angle
Implementation Method 3
a powder dispenser, arranged to lay down a thin layer of powder on the work plate for the formation of a powder bed
Implementation Method 4
freeform fabrication or additive manufacturing is a method for forming three-dimensional articles through successive fusion of chosen parts of powder layers
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A method for forming at least one three-dimensional article through successive fusion of parts of a powder bed on a support structure, the method comprising the steps of: providing at least one model of the three-dimensional article, lowering the support structure a predetermined distance and rotating the support structure a predetermined angle in a first direction before applying a first powder layer covering the lowered and rotated support structure, rotating the at least one model by the predetermined angle in the first direction before directing the at least one first energy beam from the at least one first energy beam source at selected locations for fusing the first powder layer, the at least one first energy beam source causing the first powder layer on the stationary support structure which is stationary to fuse in the selected locations according to the model to form first portions of the three- dimensional article.