Rotating Cathode Plating for Uniform Wire Rod Coatings

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Solution Overview

Problem

Existing plating apparatuses for wire rods fail to achieve high precision due to shadowed contact points and insufficient agitation, leading to defects and varying electrical characteristics along the wire rod.

Innovation Solution

A plating apparatus with annularly or helically wound substrates, held by a mechanism that elastically deforms to reduce diameter and rotates around an axis, using spaced cathodes and anodes to minimize contact area and enhance solution agitation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the counter-electrode or protrusions are provided on the outer periphery of the drum to contact the workpiece, then the plating can be performed, but the contact point is shadowed during plating treatment causing variable precision in the plating layer

Engineering Contradiction:

Improveplating layer precisionVSAvoidcontact point shadowing

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The single counter-electrode on the drum periphery is segmented into multiple cathodes arranged circumferentially. This segmentation distributes the contact points around the workpiece, eliminating shadowing effects and ensuring uniform plating precision all around the wire rod surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of having the workpiece rotate inside a fixed drum with a single counter-electrode, the invention inverts the approach by having multiple cathodes rotate around a stationary workpiece. This inversion eliminates the shadowing problem because the cathodes are positioned to contact the workpiece from multiple directions simultaneously.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the plating solution is not sufficiently agitated, then the plating process can be maintained, but voids and defects are formed inside the plating layer changing electrical characteristics

Engineering Contradiction:

Improveelectrical characteristic consistencyVSAvoidagitation mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention introduces dynamic rotation of the cathodes around the workpiece during plating treatment. This dynamic motion creates continuous agitation of the plating solution around the workpiece, preventing void formation and ensuring consistent electrical characteristics without requiring complex additional agitation mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention merges the plating function with the agitation function into a single rotating cathode system. The rotation of the cathodes simultaneously performs plating and agitates the plating solution, eliminating the need for separate agitation devices and reducing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Manufacturing precision

If the contact area between cathode and workpiece is large, then the plating can be performed efficiently, but the precision of the plating layer decreases due to shadowing effects

Engineering Contradiction:

Improveplating layer uniformityVSAvoidplating efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The single large contact area is segmented into multiple smaller contact points distributed circumferentially. Each cathode provides a small contact area, but collectively they cover the entire workpiece surface uniformly without shadowing, maintaining both precision and efficiency through distributed contact.

Inventive Principle:

Principle #1Segmentation

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 apparatus forms a high-precision plating layer with reduced defects and uniform thickness, improving yield and precision by minimizing contact points and enhancing solution circulation.

Implementation Method 1

The holding mechanism is configured to hold the substrate from its outer periphery via the cathode with the substrate being elastically deformed to reduce the diameter of the wound substrate

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

at least one cathode is placed inside the plating tank... at least one anode is placed on the inner periphery side of the substrate held by the holding mechanism

Methodology Applied

Scientific EffectElectroplating: Electroplating

Data Source

PatentUS12410536B2Plating apparatus, plating method, and method for producing wire rod having the surface plated

Publication Date: 2025.09.09 TEIKOKU ION CO LTD

AI summary

A plating apparatus (10) is disclosed including a plating tank (9), cathodes (1a to 1f), a holding mechanism (2), at least one anode (3), and a rotation mechanism (4). The plating tank (9) contains an annularly or helically wound substrate (90) together with a plating solution. The cathodes (1a to 1f) are placed inside the plating tank (9). The holding mechanism (2) holds the cathodes (1a to 1f) at positions electrically connected to the outer periphery of the substrate (90) and holds the substrate (90) via the cathodes (1a to 1f). The anode (3) is placed at least on the inner periphery side of the substrate (90) held by the holding mechanism (2). The rotation mechanism (4) rotates at least either the substrate (90) and cathodes (1a to 1f) held by the holding mechanism (2) or the anode (3), or both, around the axis of the wound substrate (90).