Spin Formed Catalyst With Intermediary Mat
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Solution Overview
Problem
Current methods for forming catalytic devices, such as closed coupled catalysts, are costly and prone to mechanical issues like noise, vibration, and leakage due to direct metal-to-metal contact between the shell and catalyst substrate, especially in non-circular shapes, which complicates manufacturing and reduces durability.
Innovation Solution
A mat is disposed between the shell and catalyst substrate during spin forming, allowing for the creation of catalytic devices with improved sealing and reduced stress, enabling the production of durable, cost-effective, and flexible catalyst devices that can accommodate unique shapes and reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct contact between shell and catalyst substrate is used, then manufacturing simplicity is improved, but mechanical reliability deteriorates due to vibration and fatigue
Solution Approach 1:
A mat is introduced as an intermediary component between the shell and the catalyst substrate. This mat serves as a mediator that prevents direct metal-to-metal contact, thereby eliminating vibration and mechanical fatigue issues while maintaining manufacturing simplicity through the spin-forming process.
2Adaptability or versatility
If spin forming is used for non-circular shapes, then manufacturing flexibility is improved, but sealing reliability deteriorates due to direct metal-to-metal contact
Solution Approach 1:
The mat acts as a sealing intermediary that conforms to non-circular geometries during spin forming. It provides consistent sealing contact between the shell and catalyst substrate regardless of the cross-sectional shape, enabling manufacturing flexibility for elliptical and odd shapes while maintaining sealing reliability.
3Strength
If current rolling and joining techniques are used, then structural strength is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The shell and catalyst substrate are combined into a single integrated component through spin forming, eliminating the need for separate rolling and joining operations. The mat is simultaneously formed with these components, merging multiple manufacturing steps into one process that maintains structural strength while reducing complexity.
4Manufacturing precision
If shell is formed directly to catalyst substrate, then manufacturing precision is improved, but harmful factors increase due to noise and vibration
Solution Approach 1:
The mat serves as a vibration-damping intermediary that is formed precisely between the shell and catalyst substrate during spin forming. It maintains formation precision while eliminating noise and vibration by preventing direct contact between the rigid components.
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 use of a mat between the shell and catalyst substrate in the spin forming process enhances sealing, reduces manufacturing stress, and increases the durability and reliability of catalytic devices, minimizing leakage and noise while accommodating complex geometries, thus improving catalytic performance and reducing production costs.
Implementation Method 1
spin forming is known as a very flexible manufacturing method that minimizes tooling expense versus other traditional methods. Spin forming techniques typically employ discs or tubes of metal that are rotated at high speeds and are cold formed
Data Source
AI summary
A catalytic device and method for forming a catalytic device are described. The devices and methods described can be used for emissions systems in heavy duty diesel engines. In particular, a method of spin forming a catalytic device generally includes disposing a mat about an outer surface of a catalyst substrate and inserting the catalyst substrate and mat inside a shell. The mat is between the shell and the catalyst substrate. The shell, catalyst substrate, and mat can be spin formed into at least a generally elliptical shape but generally other than a circle shape.