Propeller Blade Retention Element With Hardened Corrosion-Resistant Races
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Solution Overview
Problem
Propeller blade retention elements made from corrosion-resistant metals face a challenge where hardening the bearing races to increase hardness leads to a loss of corrosion resistance, as traditional hardening methods like carburizing compromise this property.
Innovation Solution
The use of a propeller blade retention element comprising a body portion and bearing race portions made from different corrosion-resistant metals, where the bearing race portions are friction welded to the body portion and retain corrosion resistance after hardening, employing methods such as induction hardening, through-hardening, case hardening, or nitriding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bearing races are hardened through traditional methods like carburizing, then the hardness increases to resist wear, but the corrosion resistance is lost
Solution Approach 1:
The retention element is divided into two distinct parts: a body portion made from a first corrosion resistant metal and bearing race portions made from a second hardenable corrosion resistant metal. This segmentation allows each part to be optimized for its specific function - the body for corrosion resistance and the bearing races for hardness and wear resistance.
Solution Approach 2:
The retention element uses composite construction with two different corrosion resistant metals. The body portion and bearing race portions are made from different materials selected to provide the required properties - one metal provides overall corrosion resistance while the other provides hardenability for the bearing races, creating a composite structure that achieves both hardness and corrosion resistance.
2Ease of manufacture
If a single metal is used for the entire retention element, then manufacturing is simplified, but it cannot simultaneously achieve both high hardness and corrosion resistance
Solution Approach 1:
The retention element is segmented into a body portion and bearing race portions that can be manufactured separately and then joined together. This allows each segment to be manufactured from the most suitable material for its specific requirements, with the body made from corrosion resistant metal and bearing races made from hardenable metal, followed by joining through friction welding or other appropriate methods.
Solution Approach 2:
The retention element employs composite materials construction where two different corrosion resistant metals are combined. This enables the body to be made from a metal optimized for corrosion resistance while bearing races are made from a metal optimized for hardenability, achieving both high hardness and corrosion resistance in a single integrated component.
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 solution provides a retention element with both necessary hardness and corrosion resistance, preventing the loss of corrosion resistance typically associated with traditional hardening methods, ensuring durability and reliability in propeller blade operation.
Implementation Method 1
The bearing race portion is friction welded to the body portion
Implementation Method 2
employing methods such as induction hardening, through-hardening, case hardening, or nitriding
Implementation Method 3
employing methods such as induction hardening, through-hardening, case hardening, or nitriding
Data Source
AI summary
A propeller blade retention element comprises a body portion formed of a corrosion resistant metal, and at least one bearing race portion attached to the body portion, the race portion being formed of an induction hardenable, corrosion resistant metal.