Silver-Plated Rolling Bearing Cage Cavity Elimination
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Solution Overview
Problem
The durability of silver-plated cages for rolling bearings, particularly in severe sliding operations, is compromised by cavities at the interface between copper and silver plating layers formed using conventional barrel electroplating methods.
Innovation Solution
A cage for rolling bearings made of iron metal with a copper-plated base layer and a silver-plated layer, where the silver layer is formed through a lamination of strike and finishing layers directly on a smooth copper-plated surface, eliminating cavities at the interface and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional barrel electroplating method is used to form copper and silver plating layers, then the cage surface can be plated to prevent seizure, but cavities form at the interface between plating layers reducing durability
Solution Approach 1:
The patent applies parameter changes by controlling the surface roughness of the copper-plated layer within a specific range (Ra 0.3μm or less) and optimizing plating conditions to eliminate cavities at the interface. This involves adjusting electroplating parameters such as current density, plating solution composition, and surface preparation conditions to achieve the desired surface quality and interface integrity.
2Object-affected harmful factors
If the cage surface is silver-plated to prevent seizure under severe service conditions, then anti-seizure performance is improved, but the durability in sliding operation deteriorates due to cavity formation
Solution Approach 1:
The patent uses composite plating structure with copper-plated layer and silver-plated layer where each layer serves specific functions. The copper layer provides base corrosion resistance and the silver layer provides seizure prevention, while the controlled interface between them ensures durability. This composite structure optimizes both anti-seizure performance and sliding durability.
3Productivity
If barrel plating method is used to simultaneously plate multiple fine objects, then production efficiency is improved, but cavity formation at plating interfaces reduces quality
Solution Approach 1:
The patent maintains high productivity of barrel plating method while improving interface quality by optimizing parameters such as barrel rotation speed, plating solution flow rate, current density distribution, and surface preparation conditions. These parameter adjustments ensure uniform plating thickness and quality across all objects simultaneously plated, eliminating cavities at interfaces.
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 solution provides improved durability in sliding operations by ensuring direct contact between the copper and silver layers, extending the operational lifespan under severe conditions.
Implementation Method 1
a base plated layer formed on a surface of the iron metal material by using a barrel electroplating method
Implementation Method 2
The barrel electroplating method is carried out in the steps of cleaning—ground plating—cleaning—main plating—cleaning and drying with an object to be plated accommodated in a barrel
Data Source
AI summary
The present invention provides a cage, for a rolling bearing, whose surface is silver-plated by using a barrel plating method capable of improving the durability thereof in a sliding test. In the cage, for the rolling bearing, made of an iron metal material and having a precious metal-plated layer formed on a surface thereof, the precious metal-plated layer is formed on a base plated layer formed on a surface of the iron metal material by using a barrel electroplating method. A surface of the base plated layer consists of a smooth surface. The precious metal-plated layer is in direct close contact with the smooth surface. The base plated layer consists of a metal having a higher ionization tendency than the precious metal formed on the surface of the base plated layer. A cavity is not present at an interface between the copper-plated layer and the silver-plated layer.