Electrostatic 3D Printer Aerosol Applicator Layer Topography Control
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Solution Overview
Problem
Three-dimensional printing technologies face challenges in achieving uniformity and accuracy due to variations in layer thickness and topography, leading to malformed final parts from cumulative non-uniformities in layer placement and mis-registration between part and support material.
Innovation Solution
The system employs an aerosol applicator with a feedback loop that uses topographic measurements from a sensor to adjust the deposition of build and support materials, ensuring flatness and parallelism of layers by filling in depressions, thereby improving layer uniformity before additional layers are added.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional 3-D printing processes are used without real-time topographic control, then the printing process is simple and fast, but the layer thickness uniformity and topography accuracy deteriorate, leading to malformed final parts
Solution Approach 1:
The patent implements a feedback control system where a sensor measures the topography of each deposited layer in real-time, and this measurement is fed back to adjust the deposition parameters for the next layer. This closed-loop feedback mechanism ensures layer thickness uniformity while maintaining process efficiency through automated real-time adjustments.
Solution Approach 2:
The system dynamically adjusts deposition parameters based on real-time topographic measurements. The aerosol applicator modifies its operation dynamically in response to measured layer variations, enabling adaptive control of layer thickness and topography without requiring complex pre-planning or multiple printing passes.
2Manufacturing precision
If material deposition is not adjusted based on topographic measurements, then the printing process is efficient and fast, but the accuracy and flatness of layer surfaces deteriorate
Solution Approach 1:
Real-time topographic measurements are fed back to the aerosol applicator to dynamically adjust material deposition. This feedback loop corrects surface irregularities as they occur, maintaining high surface flatness without requiring slow multi-pass printing or post-processing, thus preserving printing speed.
Solution Approach 2:
The system performs preliminary topographic measurement and adjustment for each layer before the next layer is deposited. This preliminary action ensures that surface irregularities are corrected in advance, preventing cumulative errors and maintaining accuracy without slowing down the overall printing process.
3Manufacturing precision
If aerosol applicator dynamically adjusts material deposition based on feedback, then layer uniformity and accuracy improve, but the device complexity and control system complexity increase
Solution Approach 1:
The feedback loop integrates a sensor, processor, and aerosol applicator control system that work together to measure layer topography and dynamically adjust deposition parameters. This automated feedback mechanism achieves high layer placement accuracy while managing system complexity through integrated control architecture.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with an aerosol-based deposition system controlled by electronic feedback. The aerosol applicator uses computer-controlled material ejection rather than mechanical positioning systems, simplifying the overall device complexity while maintaining high precision through electronic control.
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 enhances the accuracy and uniformity of 3-D printed parts by dynamically adjusting material deposition based on real-time topographic data, reducing dimensional inaccuracies and ensuring a robust final product.
Implementation Method 1
The aerosol applicator is a gas jet having a venturi narrowed tubular jet body driven by pressurized gas
Implementation Method 2
A sensor is positioned to generate a topographic measurement of the layer on the platen after the fusing station fuses the layer
Implementation Method 3
The aerosol applicator controls the amount and location of build and support material being propelled, based on the topographic measurement of the layer from the sensor through the feedback loop
Data Source
AI summary
A 3-D printer includes build and support material development stations that electrostatically transfer build material and support material to an ITB. The ITB transfers a layer of build and support material to a platen each time the platen contacts one of the layers on the ITB, to successively form a freestanding stack of the layers on the platen. A sensor is positioned to generate a topographic measurement of the layer on the platen, and an aerosol applicator is positioned to propel build and support material on to the layer on the platen. The aerosol applicator controls the build and support material being propelled, based on the topographic measurement from the sensor through a feedback loop, to adjust the amount and location of the build material and the support material propelled on to the layer, and thereby control the flatness of surface topology of the layers in the freestanding stack on the platen.