Electrochemical Device Electrode Raster Pattern
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Solution Overview
Problem
Existing electrochemical processing devices struggle to achieve uniform layer thickness on complex-shaped objects like turbine blades, leading to excessive plating or poor quality due to uneven current density, especially in recessed areas, resulting in high material costs and inefficiencies.
Innovation Solution
The device employs a raster pattern with electrodes arranged on nodes and additional electrodes shifted relative to the nearest node, allowing for optimized current distribution and precise control of layer thickness through computer simulations and separate current sources for each electrode, enabling efficient electrochemical processing of complex surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are positioned in a complete rectangular matrix with equal spacings, then the device structure is simple and easy to manufacture, but the current density becomes non-uniform leading to excessive plating in some areas and insufficient plating in recessed areas
Solution Approach 1:
The patent applies the 'Taking out' principle by removing certain electrodes from the complete rectangular matrix pattern. Specifically, electrodes are omitted from positions that would face recessed areas of the object, preventing excessive current density in those regions. This selective removal allows the remaining electrodes to provide more uniform current distribution across the object surface, achieving better layer thickness control while maintaining manufacturing simplicity.
2Manufacturing precision
If electrodes are positioned to address recessed areas, then the layer thickness uniformity improves, but the number of electrodes increases leading to higher device complexity
Solution Approach 1:
The patent applies the 'Local quality' principle by implementing a non-uniform electrode distribution pattern. Instead of using a complete rectangular matrix with uniform spacing, the patent selectively positions electrodes based on the local geometry of the object. Areas requiring more precise control (like those near recesses) have electrodes strategically placed, while other areas have fewer or no electrodes. This local optimization achieves uniform layer thickness without requiring a complete increase in the total number of electrodes.
3Productivity
If current density is increased to reduce processing time, then the productivity increases, but the electrodes may passivate or deteriorate faster
Solution Approach 1:
The patent applies the 'Segmentation' principle by dividing the total current requirement into multiple smaller current contributions from individually controlled electrodes. Each electrode can be operated at a moderate, safe current density that prevents passivation and deterioration. By having multiple electrodes working in parallel rather than relying on a few high-current electrodes, the system achieves the required total current for productive processing while maintaining electrode stability and longevity.
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 ensures uniform layer thickness and quality across the entire surface, reducing material waste and processing time while maintaining cost-effectiveness by optimizing electrode placement and current distribution.
Implementation Method 1
control means for providing an electric current between the object that is to be processed and the electrodes
Data Source
AI summary
A device suitable for the electrochemical processing of an object is at least provided with a chamber that is to accommodate an electrolyte, a support for the object that is to be processed in the chamber, at least one set of electrodes located in the chamber such that during operation at least one electrode is located opposite each portion of a surface of said object that is to be processed. The device also includes a controller configured to provide an electric current between the object that is to be processed and the electrodes.