Truncated-Cone Oxidic Ring Molding for Crack-Resistant Ejection
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Solution Overview
Problem
The production of annular oxidic shaped bodies through mechanical compaction results in fragile precursor moldings prone to cracking during thermal treatment, leading to increased pressure loss and reduced catalyst effectiveness due to fragment formation in the catalyst bed.
Innovation Solution
The method involves changing the geometry of the precursor molding to a truncated cone shape, allowing for reduced rolling friction during ejection from the die bore, which enhances the mechanical compaction process and reduces breakage, thereby improving the structural integrity of the ring-like oxidic shaped body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If mechanical compaction is used to produce annular oxidic shaped bodies, then the catalyst bodies can be produced with a ring shape that reduces pressure loss, but the precursor moldings become fragile and prone to cracking during thermal treatment
Solution Approach 1:
The invention changes the geometric parameters of the precursor molding by forming a truncated cone shape instead of a simple annular cylinder. This parameter change in shape reduces rolling friction during ejection and enhances structural integrity during thermal treatment, while maintaining the pressure loss advantages of the annular catalyst body configuration
2Productivity
If the precursor molding is ejected from the die bore, then production can continue, but rolling friction causes breakage and reduces manufacturing quality
Solution Approach 1:
The invention introduces asymmetry by forming the precursor molding as a truncated cone with a smaller top surface area than base area, rather than a symmetric annular cylinder. This asymmetric geometry reduces rolling friction during ejection from the die bore, preventing breakage and maintaining manufacturing precision while enabling continuous production
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 significantly reduces breakage and maintains the pressure loss advantage of annular catalyst bodies by minimizing rolling friction and enhancing the cohesion of the powdery aggregate, resulting in more robust and effective ring-like oxidic shaped bodies.
Implementation Method 1
mechanical compaction of a powdery aggregate of components introduced into the filling space of a die
Implementation Method 2
at least one metal compound which can be converted into a metal oxide by thermal treatment at a temperature ≥ 100 °C
Data Source
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AI summary
The invention relates to a method for producing a ring-shaped oxidic molded body by mechanically compacting a powdered aggregate introduced into the cavity of a mold, the peripheral surface of the resulting compressed structure corresponding to that of a truncated cone.