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 in maintaining corrosion resistance after hardening processes like carburization, which are used to increase the hardness of bearing races, leading to potential wear issues.
Innovation Solution
The use of corrosion-resistant, hardenable materials like stainless steels for the bearing race portions, which are friction welded and induction hardened, allowing for retention of corrosion resistance while achieving the necessary hardness for the bearing races.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carburization is applied to harden bearing races, then wear resistance is improved, but corrosion resistance deteriorates
Solution Approach 1:
The retention element is divided into two distinct parts: a body portion made from corrosion resistant metal and a bearing race portion made from hardenable metal. This segmentation allows each part to have optimized properties for its specific function while being part of a unified component.
Solution Approach 2:
Different regions of the retention element have different material properties. The body portion uses corrosion resistant metal for chemical stability, while the bearing race portion uses hardenable metal for wear resistance. This local differentiation of material quality resolves the contradiction between hardness and corrosion resistance.
2Strength
If metal retention elements are used for structural strength, then mechanical strength is improved, but corrosion resistance deteriorates after hardening
Solution Approach 1:
The retention element combines two different metals with complementary properties: corrosion resistant metal for the body and hardenable metal for the bearing races. This composite construction achieves both mechanical strength and corrosion resistance by leveraging the strengths of each material in appropriate locations.
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 ensures that the propeller blade retention elements maintain effective corrosion resistance and hardness, preventing wear and extending the lifespan of the components.
Implementation Method 1
The bearing race portion is friction welded to the body portion
Implementation Method 2
The bearing race portion is induction hardened
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
A propeller blade retention element (6) comprises a body portion (40) formed of a corrosion resistant metal, and at least one bearing race portion (42) attached to the body portion (40), the race portion (42) being formed of an induction hardenable, corrosion resistant metal.