Reflective Coating for Additive Manufacturing Surface Topography
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Solution Overview
Problem
In additive manufacturing, random errors during the process lead to defects, and real-time inspection is necessary to correct these errors, particularly in the topography of the object's surface, which is challenging due to interactions like sub-surface scattering and absorption of radiation by construction materials.
Innovation Solution
Generating correction data that compensates for interactions with radiation by obtaining scattering data and surface data, using a second object that suppresses interaction with radiation, and applying this data to transform scattering data into what would be observed if radiation scattered entirely off the surface, allowing for accurate depth estimation and surface topography analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical triangulation is used to inspect surface topography in real-time, then manufacturing precision can be improved through error correction, but measurement precision deteriorates due to sub-surface scattering and absorption of radiation by construction materials
Solution Approach 1:
A reflective coating is applied to the surface of the construction material as an intermediary layer. This coating has high reflectivity and low absorption properties, allowing radiation to bounce off the surface without penetrating into the material. The coating acts as a mediator between the radiation source and the material surface, enabling accurate optical measurements by preventing sub-surface scattering while maintaining surface topography information.
Solution Approach 2:
The optical properties of the material surface are changed by applying a reflective coating with specific optical parameters (high reflectivity, low absorption). This parameter change transforms the surface from one that absorbs and scatters radiation into one that reflects radiation predictably, thereby improving measurement precision without sacrificing manufacturing precision.
2Loss of information
If radiation penetrates into construction material during inspection, then subsurface information can be obtained, but measurement precision worsens due to sub-surface scattering and absorption effects
Solution Approach 1:
The harmful effects of radiation absorption and sub-surface scattering are converted into a benefit by applying a reflective coating. The coating transforms the interaction from one where radiation is lost to absorption and unpredictable scattering into one where radiation is reflected predictably, providing clear surface topography information while eliminating the harmful subsurface scattering effects.
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 method enables real-time correction of defects and accurate surface topography analysis, improving the precision and quality of additive manufacturing by accounting for material interactions with radiation, thereby reducing irretrievable defects.
Implementation Method 1
The second object is one that has been configured to suppress interaction with the first radiation... Among the foregoing practices are those in which the second object is simply the first object after the first object has been coated with a reflective coating
Data Source
AI summary
A method includes generating correction data for a construction material that is used by an additive-manufacturing machine to manufacture an object. This correction data compensates for an interaction of the construction material with first radiation that has been used to illuminate the construction material.