Pixelated Printhead Distance Measurement in Electrochemical Additive Manufacturing
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Solution Overview
Problem
Metal additive manufacturing is limited by high costs and rough surface finishes, and electrochemical-additive manufacturing (ECAM) systems face challenges in determining the spacing between build plates and printheads to prevent hard shorts, which can damage the printhead and material deposit.
Innovation Solution
A method for ECAM systems involves positioning the build plate and printhead at a set orientation, applying a measuring voltage to pixelated electrodes, and measuring current values to determine distances, generating a target map to adjust deposition based on these distances, thereby preventing hard shorts and ensuring accurate deposit growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spacing between build plate and printhead is reduced to improve deposition efficiency, then productivity increases, but the risk of hard shorts increases damaging the printhead
Solution Approach 1:
The system performs preliminary mapping of the build plate surface topography before deposition begins. This advance knowledge of surface contours allows the control system to pre-calculate safe deposition parameters and electrode positioning, enabling high-speed deposition while maintaining reliable spacing to prevent hard shorts between the printhead and build plate.
Solution Approach 2:
The system dynamically adjusts deposition parameters including electrode positioning, deposition speed, and current intensity based on real-time feedback from the mapping data. This dynamic adaptation allows the system to maintain optimal spacing that prevents hard shorts while maximizing deposition efficiency across varying surface topographies.
2Device complexity
If conventional additive manufacturing techniques are used to reduce cost, then device complexity decreases, but surface finish quality deteriorates
Solution Approach 1:
The system replaces conventional thermal-based additive manufacturing with electrochemical deposition. This substitution eliminates the need for high-power lasers or electron beams, reducing device complexity and cost, while simultaneously achieving superior surface finish quality through controlled electrochemical reactions that deposit material layer-by-layer without the rough surfaces characteristic of thermal sintering.
3Measurement precision
If mapping resolution is increased to improve distance measurement accuracy, then measurement precision increases, but the time required for mapping increases
Solution Approach 1:
The mapping process is divided into multiple passes or zones, allowing the system to acquire high-resolution data systematically across the build plate surface. This segmented approach enables comprehensive mapping with high measurement precision while managing total mapping time through efficient data acquisition and processing in discrete segments.
Solution Approach 2:
The system performs mapping at higher resolution than the minimum required for basic operation, particularly in critical deposition zones. This excessive mapping action ensures superior measurement precision for distance measurements, allowing the system to compensate for variations and maintain high deposition accuracy, while the additional time investment is offset by reduced rework and improved overall process reliability.
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 allows for precise control of the deposition process, reducing the risk of hard shorts and ensuring accurate and efficient metal deposition without damaging the printhead or material, enhancing the reliability and quality of the manufacturing process.
Implementation Method 1
applying a measuring voltage between a measuring reference plate and the set of pixelated electrodes while obtaining one or more current values of current passing through each pixelated electrode
Implementation Method 2
ECAM systems and methods of operating such systems... depositing a second copper deposit over the first copper deposit
Data Source
AI summary
Described herein are ECAM systems and methods of operating such systems or, more specifically, methods of determining the spacing between build plates and printheads before deposits contact the printheads. A method may comprise positioning a build plate and a printhead (e.g., comprising a copper deposit) at a set orientation relative to each other and for some time (e.g., to allow changes in the electrolyte between the build plate and the printhead and/or changes to the printhead's electrode surface). Thereafter, a measuring voltage is applied between each pixelated electrode of the printhead and a measuring reference plate (which may be the build plate or another plate) while obtaining one or more current values. These current values are then compared to the calibration data set to determine the distances between this electrode and the build plate or, more specifically, the deposit on the build plate.