Vented Brake Rotor Welding via Localized Metal Matrix Composite Zones
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Solution Overview
Problem
Existing methods for manufacturing vented brake rotors with metal matrix composite (MMC) materials face challenges such as non-uniform distribution of reinforcing particles, machining difficulties due to interspersed silicon carbide, and welding complications caused by embrittlement, which hinder the creation of complex vent geometries and efficient heat management.
Innovation Solution
The method involves forming MMC brake rotors by creating ceramic preforms with localized MMC portions, infiltrating them with metal, and welding two separate side plates with MMC on the outer surfaces and metal on the inner surfaces, allowing for complex vent geometries and efficient heat dissipation through air flow through the vents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If MMC materials with reinforcing particles are used in brake rotors, then wear resistance and strength are improved, but machining difficulty increases due to interspersed silicon carbide particles
Solution Approach 1:
The patent applies local quality by creating distinct zones within the brake rotor: MMC portions with reinforcing particles on the outer surfaces for wear resistance, and pure metal portions in the interior for ease of machining. This spatial differentiation allows each region to have optimized properties for its specific function.
Solution Approach 2:
The brake rotor is segmented into separate MMC portions and pure metal portions, allowing the reinforcing particles to be localized only where needed for wear resistance, while the pure metal interior remains free of particles for easier machining operations.
2Temperature
If MMC materials are used in brake rotors, then temperature resistance is improved, but welding complications occur due to embrittlement
Solution Approach 1:
The patent creates a local quality distribution where MMC material with superior temperature resistance is placed only in specific zones requiring thermal performance, while pure metal zones are maintained in areas requiring welding, thus avoiding embrittlement issues in welded regions.
Solution Approach 2:
The rotor structure is divided into MMC portions for thermal performance and pure metal portions for welding compatibility, eliminating the conflict between temperature resistance and weldability by separating these functions into different material zones.
3Temperature
If complex vent geometries are created in brake rotors, then heat dissipation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by concentrating complex vent geometries and MMC portions in specific zones where thermal management is critical, while maintaining simpler pure metal zones in other areas, thus optimizing heat dissipation without uniformly increasing manufacturing complexity throughout the entire rotor.
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 enables the production of brake rotors with improved wear resistance, reduced weight, and enhanced heat management, allowing for increased braking forces without material damage from overheating, while simplifying machining and welding processes.
Implementation Method 1
A metal matrix composite (MMC) is generally made by incorporating a reinforcing material into a metal matrix. For example, a MMC may comprise a ceramic preform that is infiltrated with a metal.
Implementation Method 2
Calipers having brake pads that squeeze the exterior and interior of the brake rotor to cause friction and reduce the rotation of the brake rotor. During the vehicle braking process there is often a high energy transfer to the frictional surface of the brake rotor which can lead to a rise in temperature.
Data Source
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AI summary
A method for making a metal matrix composite vented brake rotor (100) includes: providing a first side plate (120); providing a second side plate (130); and welding the first and second side plates (120, 130) together. The first and second side plates (120, 130) have outer surfaces (122, 132), inner surfaces (228, 138), and metal matrix composite portions extending from the outer surfaces (122, 132) to a distance from the inner surface that is less than a thickness measured between the inner surface and outer surface. The inner surface of the first side plate includes a vent portion (112). The step of welding includes welding the first vent portion to the second inner surface to form the vented brake rotor (100), the vented brake rotor (100) having a plurality of vents formed by the first and second inner surfaces (128, 138) and the first vent portion.