Helical Mixing Segment for Uniform Ceramic Extrusion
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Solution Overview
Problem
Existing extrusion apparatuses introduce temperature, shear, and compositional gradients during the processing of ceramic materials, which can lead to defects in honeycomb structures by not ensuring uniform mixing, affecting the quality of the final products.
Innovation Solution
The use of a mixing segment with a shaft and plow elements aligned along a helical path, where each plow element has an outer peripheral arcuate ramp extending radially outwardly, and a step extending inwardly, positioned between the ramps, to minimize gradients and ensure uniform mixing by positioning the helical path at an angle determined by the velocity vectors of the material and the plow elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mixing and pumping methods are used in extrusion apparatus, then material processing is achieved, but temperature gradients, shear gradients and compositional constituent gradients are imposed on the material adversely affecting product quality
Solution Approach 1:
The mixing element is divided into multiple segments along its length, with each segment having different flight configurations. This segmentation allows different regions of the material to experience different mixing intensities and patterns, preventing the formation of large-scale gradients while maintaining effective mixing throughout the extruder.
Solution Approach 2:
Different portions of the mixing element have locally optimized flight characteristics - some segments have higher flight angles for intense local mixing, while others have lower angles for gentler material handling. This local quality variation ensures uniform mixing without imposing adverse gradients on any particular region of the material.
2Stability of the object's composition
If intense mixing is applied to achieve uniform composition, then compositional uniformity is improved, but temperature gradients and shear gradients increase adversely affecting material properties
Solution Approach 1:
The segmented mixing element creates periodic mixing zones as material progresses through the extruder. Material passes through alternating regions of high and low mixing intensity, which distributes compositional uniformity while allowing temperature and shear to reset between intense mixing zones, preventing excessive gradient accumulation.
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 configuration promotes uniform dispersive and distributive mixing, reducing temperature, shear, and compositional gradients, resulting in higher-quality honeycomb structures with minimized defects.
Implementation Method 1
a plurality of plow elements aligned along a helical path extending about a rotation axis of the shaft. Each plow element includes an outer peripheral arcuate ramp extending radially outwardly along the helical path from a root to an outer tip of the plow element
Data Source
AI summary
A mixing segment for an extrusion apparatus comprises a shaft and a plurality of plow elements aligned along a helical path extending about a rotation axis of the shaft. Each plow element includes an outer peripheral arcuate ramp extending radially outwardly along the helical path from a root to an outer tip of the plow element. Methods of manufacturing a mixing segment and methods of manufacturing a honeycomb structure with an extrusion apparatus are also provided.