Engineered Ceramic Filters for Casting Metal Flow

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Solution Overview

Problem

Conventional ceramic filters used in high temperature casting can break and contaminate the metal stream, and their random structure leads to inconsistent metal flow rates, affecting the solidification process.

Innovation Solution

Engineered ceramic filters with individual ceramic ligaments arranged in a grid pattern are produced using Additive Manufacturing (AM), allowing for consistent and predictable metal flow rates without contamination, tailored to specific casting requirements through systematic layering and CAD adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional random ceramic sponge filters are used, then filtration function is provided, but metal flow rate becomes inconsistent and unpredictable

Engineering Contradiction:

Improvefiltration functionVSAvoidmetal flow rate consistency

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent changes the structural parameters of the filter from random sponge configuration to controlled grid pattern with specific ligament dimensions, spacing, and rotational orientations. This parameter control enables consistent metal flow rates while maintaining filtration function through engineered pore structures.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces asymmetry by rotating adjacent layers of the grid pattern at different angles (e.g., 0°, 45°, 90°, 135°), creating a three-dimensional interconnected structure that improves flow consistency and prevents preferential flow paths while maintaining filtration efficiency.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If conventional ceramic filters with dendrite-like protrusions are used, then filtration is achieved, but filter material breaks loose and contaminates the molten metal stream

Engineering Contradiction:

Improvefiltration capabilityVSAvoidfilter material contamination

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The filter is segmented into a grid pattern of individual ceramic ligaments rather than continuous dendrite-like structures. This segmentation creates discrete, controlled filtration elements that are less prone to breaking loose and contaminating the molten metal while maintaining effective impurity capture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the geometric parameters of the filtration structure from irregular dendrite-like protrusions to uniform grid-patterned ligaments with controlled dimensions and spacing, eliminating the sharp irregularities that cause material breakage and contamination.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional filters are used, then basic filtration is provided, but cooling rate and heat flow variations negatively impact the solidification process

Engineering Contradiction:

Improvefiltration functionVSAvoidcooling rate consistency

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent engineers the filter structure with controlled ligament thickness, spacing, and layer orientation to optimize thermal properties. The grid pattern and rotational layering create uniform heat distribution and consistent cooling rates, eliminating the temperature variations that plague conventional random sponge filters during the solidification process.

Inventive Principle:

Principle #35Parameter changes

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 engineered filters provide consistent filtration efficiency and predictable metal flow, reducing flaws in castings by minimizing contamination and ensuring optimal thermal and mechanical properties.

Implementation Method 1

porous ceramic filters to minimize dross and other forms of contamination

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

remove impurities from high temperature casting materials

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

Proven Additive Manufacturing (AM) methods generate engineered filters

Methodology Applied

Scientific EffectAdditive Manufacturing: 3D Printing

Data Source

PatentUS10780493B1Three-dimensional printing of engineered, on-demand, ceramic filters for castings

Publication Date: 2020.09.22 RENAISSANCE SERVICES INC

AI summary

Systems and methods are disclosed that overcome problems with conventional filters for high temperature casting materials. According to embodiments, uniform, engineered filters enable consistent and repeatable metal flow rates without becoming a secondary source of contamination. Proven Additive Manufacturing (AM) methods generate engineered filters that achieve consistent filtration efficiency and predictable metal flow into a casting mold. Through this application of AM for ceramics, the resulting filter incorporates features that can be adjusted on-demand to address the needs of specific alloys and geometries applied in the production of castings. According to an embodiment, the method includes generating, using an additive manufacturing apparatus, a plurality of layers, wherein each layer includes individual ceramic ligaments arranged in a grid pattern having a two-dimensional rotational orientation. The method further includes stacking the layers along a thickness direction to form the filter.