3D Printing Surface Scanning for Layer Uniformity
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Solution Overview
Problem
Additive construction processes using powder-type construction materials often face delays and wastage due to solidification or coating errors, particularly delamination issues caused by uneven surfaces, leading to inefficient processes and contamination of the construction atmosphere.
Innovation Solution
Implement a method that scans the surface to be coated before each layer application to detect unevennesses and only initiates smoothing or removal processes when necessary, using localized removal elements and sensors to address specific defects, thereby reducing unnecessary mechanical or thermal stresses and preserving the construction atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface scanning and selective smoothing are implemented before each layer application, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The surface is scanned and evaluated before each layer application to detect unevennesses in advance. This preliminary action allows the system to identify areas requiring smoothing before coating, ensuring manufacturing precision without performing unnecessary smoothing operations.
Solution Approach 2:
Instead of smoothing the entire surface uniformly, the system applies smoothing only to specific local areas where unevennesses exceeding tolerance ranges are detected. This localized approach maintains precision while reducing overall system complexity and operational overhead.
2Manufacturing precision
If smoothing is performed before each layer application regardless of necessity, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The system performs smoothing action only to the extent necessary - only when surface unevennesses exceed the defined tolerance range. This partial action approach maintains required surface smoothness for manufacturing precision while avoiding excessive smoothing operations that would reduce construction speed and productivity.
Solution Approach 2:
Surface scanning is performed as a preliminary step before each layer application to assess whether smoothing is actually needed. This allows the system to skip smoothing operations when the surface is already within tolerance, thereby maintaining productivity while ensuring precision when required.
3Manufacturing precision
If frequent surface scanning and smoothing are performed, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The system performs scanning and smoothing only partially - only when surface unevennesses are detected that exceed tolerance ranges. This avoids unnecessary scanning and smoothing operations, reducing the time lost in the construction process while maintaining layer uniformity where actually needed.
Solution Approach 2:
The surface scanning system provides feedback about actual surface conditions before each layer application. This feedback mechanism allows the control system to make intelligent decisions about whether smoothing is necessary, optimizing the balance between maintaining manufacturing precision and minimizing time loss in the overall construction process.
4Manufacturing precision
If mechanical smoothing devices are used continuously, then manufacturing precision is improved, but object-generated harmful factors increase
Solution Approach 1:
Mechanical smoothing devices are activated only partially - specifically when surface unevennesses exceed tolerance ranges. This reduces the frequency of mechanical intervention, thereby minimizing the generation of harmful factors such as dust, debris, and contamination in the construction atmosphere while maintaining surface evenness where required.
Solution Approach 2:
The system replaces continuous mechanical smoothing with a more selective approach, using optical scanning to detect unevennesses and then applying mechanical smoothing only when and where necessary. This substitution of continuous mechanical action with selective mechanical action reduces contamination while maintaining manufacturing precision.
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 accelerates the construction process by minimizing unnecessary smoothing actions, reducing material wastage, and maintaining a clean construction environment by ensuring only required reworking is performed, thus enhancing the efficiency and quality of three-dimensional object production.
Implementation Method 1
a sensor (31) which is suited and formed to scan the surface (13) to be coated, especially of the component (14), prior to a coating process
Implementation Method 2
the radiation is directed to the positions corresponding to the respective cross-section of the objects for melting on the construction material
Implementation Method 3
solidification of layers of a powder-type construction material that can be solidified using electromagnetic radiation
Data Source
AI summary
A method for producing three-dimensional components by successively solidifying layers of a powder construction material solidified by means of electromagnetic radiation, in particular bundled radiation such as laser radiation or electron radiation, at the locations corresponding to the respective cross-section of the component, in particular SLM or SLS. A device comprising a support device, the height of which can be adjusted within a construction chamber, is provided for supporting the component including a coating device for applying layers of the construction material onto the support device or onto a previously formed layer and comprising an irradiating device for irradiating layers of the construction material in some regions to solidify layers. A surface section to be coated is scanned with respect to the evenness of the section prior to the application of a new layer. In the event of an unevenness exceeding a known tolerance range, the unevenness is removed or leveled out.