Selective Plating Sleeve With Radial Apertures
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Solution Overview
Problem
Current methods for selective plating of female electrical contacts are inefficient, unreliable, and wasteful, as they often result in gold plating on both interior and exterior surfaces, leading to excessive use of expensive materials like gold and platinum.
Innovation Solution
A system and method utilizing a sleeve subassembly with radially-extending apertures or slits that allows plating solution to flow only to the interior surface of the contact, preventing access to the exterior and ensuring uniform, cost-effective selective plating by using a transport element with fluid relief ports and an electroplating circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional plating drums are used to plate electrical contacts, then the plating process is simple and efficient, but gold plating is applied to both interior and exterior surfaces resulting in excessive material waste
Solution Approach 1:
The plating system is segmented into separate interior and exterior plating zones. The plating drum is divided such that one drum plates exterior surfaces while a separate drum or rotating mechanism plates interior surfaces of female contacts, allowing selective application of gold plating only where needed
Solution Approach 2:
A masking mechanism or selective positioning device acts as an intermediary between the plating solution and the contact surfaces. This intermediary selectively exposes only the interior surfaces to the plating solution while preventing access to exterior surfaces, thereby reducing gold material waste
2Loss of substance
If selective plating methods are used to apply gold only to specific portions, then material waste is reduced, but the plating process becomes more complex and less reliable
Solution Approach 1:
The plating system employs periodic rotation or oscillation of the contacts within the plating drum, ensuring that interior surfaces are repeatedly exposed to the plating solution in a controlled manner. This periodic action ensures uniform and consistent gold deposition on interior surfaces while maintaining process reliability
Solution Approach 2:
The plating process parameters such as solution flow rate, electrical current density, and exposure time are precisely controlled and adjusted to ensure uniform gold deposition on interior surfaces. These parameter changes maintain plating consistency while achieving selective application
3Loss of substance
If prior masking techniques are used to prevent plating on exterior surfaces, then selective plating is achieved, but the process becomes less efficient and more costly
Solution Approach 1:
The plating system is designed to automatically position and orient contacts during the plating process, eliminating the need for manual masking operations. The system self-regulates to ensure only interior surfaces are plated, maintaining high productivity while reducing material waste
Solution Approach 2:
Complex mechanical masking systems are replaced with an electrically controlled plating mechanism. The system uses electrical signals to control solution flow and contact positioning, replacing cumbersome mechanical masking devices and improving production efficiency
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 enables uniform and cost-effective selective plating of the interior surfaces of female electrical contacts, minimizing waste and ensuring efficient use of precious metals by restricting plating solution access to the exterior, while maintaining electrical continuity and avoiding contamination.
Implementation Method 1
electroplating circuit configured to deposit gold plating material onto the interior surface of the female contact
Data Source
AI summary
A multiplicity of sleeve subassemblies each include an electrically insulative portion, and are configured to support an electrical contact having a socket. Each insulative portion has a socket bore and at least one radial aperture extending radially outward therefrom. The sleeve subassemblies are transported across a plating bath whereby at least a lower segment of the insulative portions become submerged in plating solution. The socket bore maskingly engages the contact, thereby substantially preventing plating solution from contacting the outer surface of the socket. The radial apertures facilitate the continuous flow of plating solution through each socket so as to enable selective plating of the socket inner surface. The sleeve subassemblies may be formed from mutually-engageable half-sleeves conveyed on separate closed-loop transport belts so as to facilitate efficient loading, plating and release of the electrical contacts. The radial apertures may take on various forms, including holes, circumferential slits or vertical slits.