Layer-Wise Manufacturing File Segmentation for Geometrical Accuracy
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Solution Overview
Problem
Layer-wise manufacturing processes face challenges in achieving precise geometrical accuracy, particularly with small features like holes, due to the limitations of a single global offset value for laser processing, which affects the entire part and cannot accommodate varying build strategies for different aspects of a single part.
Innovation Solution
The method involves splitting a single CAD file into multiple sub-files based on feature size and characteristics, applying distinct processing parameters to each sub-file, and overlapping them to achieve precise joining and varying surface finishes, allowing for different laser offsets and process characteristics for different elements of a part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single global offset value is used for the entire part, then the processing is simple and consistent, but the geometrical accuracy of small features like holes deteriorates because the heat affected zone closes up the hole
Solution Approach 1:
The patent divides a single part into multiple elements, each represented by separate .sli files. This segmentation allows different laser offset values to be applied to different elements, enabling precise control over small features like holes while maintaining processing simplicity through automated file management.
Solution Approach 2:
The patent applies different laser offset values to different elements of the same part based on their specific geometric characteristics. Small features receive offset values optimized for hole formation, while larger features receive offset values optimized for their dimensional accuracy, achieving local quality optimization throughout the part.
2Manufacturing precision
If different laser offset values are applied to different features, then the geometrical accuracy of small features improves, but the device complexity increases due to multiple files and parameters
Solution Approach 1:
The patent creates a universal workflow that handles multiple .sli files with different parameters through automated import and assembly processes. The system maintains a library of elements that can be selectively assembled into different parts, reducing the perceived complexity through standardization and reuse.
Solution Approach 2:
The patent implements automated processes where the software automatically imports multiple .sli files, assigns appropriate laser parameters to each element, and assembles them into the final part geometry. This self-service automation eliminates manual parameter management complexity while maintaining high geometrical accuracy.
3Adaptability or versatility
If multiple .sli files are used to represent different elements of a part, then varying process characteristics can be applied to different features, but the file management and processing complexity increases
Solution Approach 1:
The patent introduces an intermediary software layer that manages the import, parameter assignment, and assembly of multiple .sli files. This intermediary automatically handles the complexity of file management while providing users with a simplified interface to define elements and their associated process characteristics.
Solution Approach 2:
The patent pre-processes and prepares multiple .sli files with their respective laser parameters before actual manufacturing. Elements are pre-defined and stored in a library with their optimal process characteristics already configured, allowing rapid assembly and reducing processing complexity during production.
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 creation of parts with critical dimensional accuracy and varying surface finishes by allowing separate processing of different features within a single part, improving geometrical accuracy and surface quality without compromising the entire part's dimensions.
Implementation Method 1
a point source of energy such as a laser or electron beam is selectively applied to a layer of powder as required on a layer by layer basis to build up a 3D part
Implementation Method 2
laser 'sintering'
Implementation Method 3
laser 'smelting'
Implementation Method 4
a point source of energy such as a laser or electron beam is selectively applied to a layer of powder
Implementation Method 5
The laser or other point source of heat has a finite spot size and creates a heat affected zone larger than its spot size
Implementation Method 6
to solidify
Implementation Method 7
laser 'sintering'
Data Source
AI summary
A method of forming an article in a layer wise manufacturing process from a computer software file representing the article includes dividing the file into sub files in dependence of the size or other characteristics of features of the article to be created, applying a process characteristic selected independence on a characteristic feature to each sub file and manufacturing the article in accordance with the subfiles.