Surface Roughness Analysis for Additive Manufacturing

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Solution Overview

Problem

Additively manufactured (AM) parts often have rough surfaces due to the layer-upon-layer manufacturing process, which can be undesirable for aesthetic applications and may affect mechanical performance. Conventional surface measurement methods are time-consuming and not suitable for efficient, automated processing.

Innovation Solution

A non-contact system and method using image capturing and machine learning to efficiently and accurately determine the surface condition of AM polymer parts by analyzing and categorizing surface textures and patterns, providing real-time feedback for processing adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional surface measurement methods are used, then measurement precision is achieved, but productivity deteriorates due to time-consuming analysis

Engineering Contradiction:
Improvesurface condition determination accuracyVSAvoidsurface analysis speed
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces conventional mechanical contact-based surface measurement methods with optical imaging and machine learning analysis. The system captures surface images using a camera and processes them through trained neural networks to determine surface conditions, eliminating the need for time-consuming mechanical measurement tools while maintaining or improving measurement precision.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a digital copy of the surface condition through image capture and stores it as training data for machine learning models. This digital representation allows rapid analysis without repeated physical measurement, enabling the system to quickly determine surface conditions by comparing image features against trained patterns rather than performing new physical measurements each time.

Inventive Principle:
Principle #26Copying

2Measurement precision

If conventional surface measurement methods are used, then measurement precision is achieved, but loss of time increases

Engineering Contradiction:
Improvesurface roughness determination accuracyVSAvoidsurface analysis time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary action by capturing surface images and storing them as training data before actual measurement is needed. The machine learning model is trained in advance on these pre-captured images, so that when surface condition determination is required, the system can quickly analyze new surfaces by comparing them against the pre-trained model rather than performing time-consuming measurements from scratch.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent substitutes time-consuming mechanical measurement processes with rapid optical imaging and digital pattern recognition. The system captures surface conditions as images and uses trained neural networks to instantly analyze and categorize surface roughness, eliminating the need for lengthy physical measurements and significantly reducing analysis time while maintaining precision.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If non-contact image analysis is used, then productivity is improved, but measurement precision may deteriorate

Engineering Contradiction:
Improvesurface analysis efficiencyVSAvoidsurface condition determination accuracy
Core Design Contradiction:
ProductivityVSMeasurement precision

Solution Approach 1:

The patent implements feedback by using captured surface images to train machine learning models, which then provide accurate predictions about surface conditions. The system continuously refines its accuracy by learning from captured images and comparing predictions against known surface conditions, ensuring that the non-contact method achieves both high productivity and measurement precision through iterative improvement.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent creates detailed digital copies of surface conditions through image capture and uses these copies as training data for machine learning models. This digital copying approach allows the system to maintain measurement precision by analyzing the captured image data through sophisticated algorithms, while simultaneously achieving high productivity through rapid digital processing compared to mechanical measurement methods.

Inventive Principle:
Principle #26Copying

4Productivity

If automated surface analysis is implemented, then productivity is improved, but device complexity increases

Engineering Contradiction:
Improvesurface analysis throughputVSAvoidsystem structure complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical measurement systems with a simpler optical imaging system combined with software-based machine learning analysis. Instead of using complicated mechanical tools for surface measurement, the system uses a camera to capture surfaces and processes the images through trained neural networks, reducing hardware complexity while maintaining or improving productivity through automated digital processing.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses digital copying through image capture to simplify the measurement process. By creating digital representations of surface conditions and using these copies for analysis through machine learning, the system eliminates the need for complex mechanical measurement apparatus, reducing device complexity while achieving high productivity through rapid digital image processing and pattern recognition.

Inventive Principle:
Principle #26Copying

Data Source

PatentEP3781400B1Surface roughness analysis
Publication Date: 2025.01.29 ADDITIVE MANUFACTURING TECHNOLOGIES LIMITED
  • EP3781400B1 patent drawingFigure 1
  • EP3781400B1 patent drawingFigure 2a
  • EP3781400B1 patent drawingFigure 2b

AI summary

The present application describes a method of determining a condition of a surface, comprising obtaining image data of a surface; extracting a plurality of test parameters associated with a condition of the surface from the image data; and determining the condition of the surface based on the test parameters. A system for determining a condition of a surface and a method of processing a part are also described.