Rotating Build Unit for Continuous Additive Manufacturing
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Solution Overview
Problem
Conventional additive manufacturing technologies face challenges in efficiently producing large objects with precision and minimizing material waste, particularly in powder bed fusion processes where excessive powder usage is costly and unmanageable, especially for large-scale applications.
Innovation Solution
The development of an additive manufacturing apparatus featuring a rotating build unit with a concentric powder delivery, recoating, and irradiation mechanisms, allowing for continuous and simultaneous powder deposition, leveling, and melting in a circular path around a central axis, utilizing an annular powder bed to reduce material usage and enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional powder bed fusion processes are used to manufacture large objects, then the objects can be produced with layered precision, but excessive powder is consumed and becomes unmanageable
Solution Approach 1:
The build chamber is divided into multiple zones with selective powder application. The recoater mechanism selectively deposits powder only in specific regions where material is needed for the current layer, rather than covering the entire build platform. This segmentation of the powder bed into active and inactive zones dramatically reduces powder consumption while maintaining manufacturing precision in the built object.
Solution Approach 2:
The system transitions from a traditional horizontal powder bed to a vertical or dynamically adjustable powder delivery system. Powder is delivered and deposited in a controlled manner from above, allowing precise placement only where needed. This dimensional change in powder delivery enables selective powder application, reducing waste while maintaining layer precision.
2Volume of moving object
If a large powder bed is used to accommodate large objects, then the build volume is sufficient, but the powder becomes difficult to manage and control precision
Solution Approach 1:
The recoater mechanism and powder delivery system are made dynamically adjustable, allowing the powder bed depth and coverage area to be modified between layers. The system can adapt the powder distribution pattern to match the specific geometry of each layer being built, maintaining precise control over layer uniformity even as the build volume requirements change for large objects.
Solution Approach 2:
Different regions of the build chamber receive different amounts or types of powder treatment. The recoater mechanism applies powder with varying thickness or density in different zones based on the local requirements of the object geometry. This local quality approach allows precise control over layer uniformity in critical areas while accommodating the overall large build volume.
3Manufacturing precision
If the laser beam pauses to wait for powder leveling between layers, then the powder bed is properly prepared, but the manufacturing process becomes intermittent and less efficient
Solution Approach 1:
The system enables continuous operation by overlapping the powder delivery and laser processing operations. While the laser is processing one region, the recoater mechanism simultaneously prepares powder for the next region or the same region for the subsequent layer. This continuous action eliminates idle pause time between layers, maintaining both powder bed preparation quality and manufacturing productivity.
Solution Approach 2:
The powder is pre-leveled and positioned in the build chamber before the laser processing begins for each layer. The recoater mechanism completes the powder distribution and leveling operations in advance, allowing the laser to immediately begin processing without waiting. This preliminary preparation action ensures proper powder bed state while maintaining process continuity and efficiency.
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 enables the efficient production of large, annular or cylindrical objects with improved precision and reduced material waste, allowing for the simultaneous manufacturing of multiple smaller objects, optimizing the use of raw materials and improving process efficiency.
Implementation Method 1
a focused laser 116 scanning across the surface of the selective portion 118... The laser irradiation sinters or melts the raw material powder
Implementation Method 2
The laser irradiation sinters or melts the raw material powder, and the sintered/melted area then re-solidifies and re-crystallizes into a fused region
Implementation Method 3
The prescribed dose of powder is then spread in a thin, even layer 132 over the build surface 108 by a recoater mechanism 110
Implementation Method 4
a rotating mechanism to which at least a portion of the at least one build unit is attached that provides rotational movement around a center of rotation to the at least one build unit, such that the at least one build unit moves in a circular path about the center of rotation
Implementation Method 5
the sintered/melted area then re-solidifies and re-crystallizes into a fused region of the work piece
Implementation Method 6
the sintered/melted area then re-solidifies and re-crystallizes into a fused region of the work piece
Data Source
AI summary
An apparatus for continuous powder-based additive manufacturing of a large annular object or multiple smaller objects simultaneously is described. The build unit(s) of the apparatus includes a powder delivery mechanism, a powder recoating mechanism and an irradiation beam directing mechanism. The build unit(s) is attached to a rotating mechanism such that the build unit(s) rotates around and above the annular powder bed during production. The rotating mechanism is supported onto a central tower, and both the rotating mechanism and the tower are concentric with the non-rotating annular powder bed. An additive manufacturing method using the apparatus involves repetitive and continuous cycles of at least simultaneously rotating the build unit(s) to deposit powder onto the powder bed and irradiating the powder to form a fused additive layer. The continuous additive manufacturing process may be further aided with a helical configuration of the powder bed build surface.