Rotary Electrode Plating for Uniform Thickness Control
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Solution Overview
Problem
The related-art brush plating method results in high film formation rates with non-uniform thickness due to electric field concentration at the end portions of the plated area, making it difficult to control the thickness uniformly.
Innovation Solution
A plating apparatus and method utilizing a rotary electrode with a plating solution holding unit, where the rotary electrode is rotated to evenly distribute the plating solution and control the electric field, preventing non-uniformity by using materials like platinum or titanium-platinum, and incorporating features such as vertical portions and polarity reversal to enhance film uniformity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If brush plating is performed at high current density to increase film formation rate, then productivity is improved, but manufacturing precision deteriorates due to electric field concentration causing non-uniform thickness
Solution Approach 1:
The electrode is made rotatable instead of stationary, allowing dynamic adjustment of the electrode position and contact pressure. This rotation enables uniform distribution of current density across the plated surface, preventing electric field concentration at end portions while maintaining high film formation rate.
Solution Approach 2:
The electrode performs periodic reciprocating motion or rotation during plating, creating periodic contact and separation. This periodic action distributes the plating process uniformly across the surface over time, ensuring consistent thickness while maintaining high current density for rapid film formation.
2Ease of operation
If reciprocating movement is used to control contact time, then ease of operation is improved, but manufacturing precision deteriorates due to difficulty in controlling contact time uniformly
Solution Approach 1:
The system incorporates control means that monitors and adjusts the electrode's position, rotation speed, and contact pressure in real-time. This feedback mechanism ensures uniform contact time across the plated surface, maintaining thickness uniformity while allowing flexible operation.
Solution Approach 2:
The electrode's rotational speed, contact pressure, and plating solution flow rate are precisely controlled and adjusted as parameters. By optimizing these parameters, the system achieves uniform contact time distribution, ensuring consistent film thickness while maintaining operational flexibility.
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
The method achieves a stable and uniform plating film thickness with reduced electric field concentration, preventing burning and peeling, and improving adhesion, especially on complex surfaces.
Implementation Method 1
a rotary electrode 1... while the rotary electrode is rotated
Implementation Method 2
Electroplating is used when a plating film is formed on a metal material... a voltage is applied between the electrode and the portion to be plated
Implementation Method 3
a plating method called a brush plating method has been proposed... voltage is applied between the electrode and the portion to be plated electrically connected to each other
Implementation Method 4
means for supplying a plating solution to the interface of said object and said anode through the carbon fibre material of said anode
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present invention relates to a plating apparatus and a plating method for partially forming a plating film (4b) on an object (4) to be plated. The plating apparatus includes: a rotary electrode (1) configured to be rotatable; a plating solution holding unit (2) arranged to the rotary electrode (1) and configured to hold a plating solution; and a power supply unit (3) configured to apply a voltage between the portion(4a) to be plated and the rotary electrode (1).