Friction Stir Deposited Gear Surfaces With Local Wear-Resistant Layers
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Solution Overview
Problem
Current additive manufacturing techniques, specifically friction stir deposition, face limitations in creating articles with tailored properties and complex geometries, such as gears, where wear resistance and corrosion resistance are critical, often requiring multiple materials and precise layering.
Innovation Solution
The method involves depositing a wear-resistant material, such as a metal-matrix composite, onto a preform using additive friction stir deposition, followed by machining to create a gear with an intermixed interface layer, providing enhanced wear and tear resistance and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additive friction stir deposition is used to deposit wear-resistant material on a preform, then wear resistance and corrosion resistance are improved, but device complexity and manufacturing difficulty increase due to the need for multiple materials and precise layering
Solution Approach 1:
The patent changes the material composition parameter by depositing a wear-resistant metal-matrix composite coating on a metallic preform, transforming the surface properties to achieve enhanced wear and corrosion resistance while maintaining the base material's mechanical properties
Solution Approach 2:
The patent employs composite material structure by combining a metallic preform (such as aluminum alloy) with a wear-resistant metal-matrix composite coating, creating a heterogeneous structure where each material performs its specialized function - the base provides structural integrity while the coating provides surface protection
2Adaptability or versatility
If additive friction stir deposition is used to create complex geometries like gears, then adaptability and versatility are improved, but manufacturing precision and material composition uniformity become more difficult to control
Solution Approach 1:
The patent applies local quality by depositing wear-resistant material specifically on the gear teeth surfaces where it is most needed, rather than uniformly coating the entire gear. This targeted approach ensures enhanced wear resistance at critical contact points while maintaining material composition control
Solution Approach 2:
The patent performs preliminary action by depositing the wear-resistant coating on the preform before final machining operations. This sequence allows the coating to be applied to the basic geometry, then precisely machined to final dimensions, ensuring both geometric accuracy and material distribution uniformity
3Reliability
If wear-resistant material is deposited on gear teeth, then wear resistance is improved, but weight increases for a given power/load capacity
Solution Approach 1:
The patent applies wear-resistant material only where needed - specifically on the gear teeth surfaces that experience contact and wear - rather than coating the entire gear body. This localized approach provides wear protection at critical interfaces while minimizing additional weight
Solution Approach 2:
The patent uses a metal-matrix composite coating that provides high wear resistance with relatively low density. The composite structure allows achieving superior surface properties without proportionally increasing the overall weight of the moving gear 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 approach results in articles with improved wear and tear resistance, corrosion resistance, and lighter weight for a given power/load capacity, enabling the fabrication of complex geometries like gears with tailored properties.
Implementation Method 1
The friction stir tool rapidly rotates and generates heat through dynamic contact friction at a tool-material interface
Implementation Method 2
Heat is generated by dynamic contact friction between the friction stir tool and a material
Implementation Method 3
Heat is generated by dynamic contact friction between the friction stir tool and a material, dissipated by plastic deformation of the material, and transferred inside the material by thermal conduction
Implementation Method 4
Heated and softened, the feed material is fed through the friction stir tool and bonds with a substrate through plastic deformation at the interface
Data Source
AI summary
A method is provided for manufacturing an article. The method comprises depositing by additive friction stir deposition a wear-resistant material on a surface of a preform to provide an intermediate article. The preform comprises a first composition and the wear-resistant material comprises a second composition. The second composition is substantially different from the first composition. The method also comprises machining the intermediate article to remove therefrom at least a portion of the wear-resistant material.