Sensing build material in additive manufacturing systems
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Solution Overview
Problem
Additive manufacturing systems face challenges in ensuring the uniform distribution of build material on the build platform, leading to irregular layers and impacting the quality of the manufactured objects due to insufficient or uneven build material supply.
Innovation Solution
A sensor module with distance sensors is used to monitor the position of the build material's top surface, and a processor determines if the volume of build material needs to be reformed, with mechanisms such as adding, removing, or redistributing material to maintain a consistent layer, utilizing a feed vane and spreader to form a uniform layer on the platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If build material is supplied from a store through a feed tray and feed vane, then the build material can be delivered to the build platform, but the distribution of build material becomes uneven leading to irregular layers
Solution Approach 1:
The system performs preliminary sensing of build material levels and distribution in the feed tray before the material is supplied to the build platform. The sensor module detects the position of the top surface of build material and identifies regions with insufficient material, allowing the system to prepare and redistribute material in advance, ensuring uniform layer formation.
Solution Approach 2:
The sensor module provides continuous feedback about the build material distribution and top surface position to the controller. This feedback loop enables real-time monitoring and adjustment of material supply, allowing the system to maintain uniform build material distribution across the build platform by detecting and correcting unevenness in the feed tray.
2Productivity
If build material is stored in a feed tray and fed to the build platform, then material supply is enabled, but the top surface position becomes irregular affecting layer quality
Solution Approach 1:
The sensor module performs preliminary detection of the top surface position and material distribution in the feed tray before material is fed to the build platform. This allows the system to identify and correct surface irregularities in advance, ensuring that only uniformly distributed material is supplied to maintain layer quality.
Solution Approach 2:
The sensor module continuously monitors the top surface position of build material in the feed tray and provides feedback to the controller. This enables real-time adjustment of material supply and redistribution actions to maintain a uniform top surface, directly improving the quality of layers formed on the build platform.
3Manufacturing precision
If a sensor module is added to monitor build material distribution, then layer uniformity can be improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical sensing systems with optical or electromagnetic sensor modules that can detect build material distribution and top surface position without physical contact. This substitution reduces mechanical complexity while providing precise, real-time monitoring capability to maintain layer uniformity.
Solution Approach 2:
The sensor module is designed to perform multiple functions: detecting top surface position, monitoring material distribution, and providing feedback for both control and alarm functions. This multi-functionality consolidates what could be multiple separate systems into a single integrated component, reducing overall device complexity 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 solution ensures a more reliable formation of regular build material layers, enhancing the quality and consistency of the products by preventing irregularities caused by insufficient or uneven material distribution.
Implementation Method 1
A sensor module 1 having a distance sensor 2 provides an indication of a position of a top surface 4 of a volume 6 of build material
Data Source
AI summary
An additive manufacturing system having a sensor module. The sensor module including a distance sensor to provide an indication of a position of a top surface of a volume of build material. The system includes a processor to determine whether the volume of build material should be reformed based on the indication.