Disposable Core Die for Ceramic Body Fabrication
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Solution Overview
Problem
Existing thin-walled disposable core dies for forming ceramic articles face challenges such as rupture under injection pressure, incomplete filling of complex internal structures, and differential shrinkage during solidification, which affect the dimensional accuracy and integrity of the ceramic core.
Innovation Solution
A disposable core die design featuring a first portion with an inlet, a second portion with coaxially aligned hollow tubes of defined wall thickness (0.1 mm to 0.5 mm) and a third portion for excess slurry discharge, along with reinforcing structures, fill cavity structures, and vent apertures to manage pressure and shrinkage, ensuring complete filling and accurate dimensionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the DCD has thin walls to enable complex internal structures, then the ability to form complex geometries is improved, but the walls become susceptible to rupture under injection pressure
Solution Approach 1:
The DCD is divided into multiple sections with varying wall thicknesses. Critical areas that require higher strength during injection are segmented with thicker walls, while non-critical areas maintain thin walls to enable complex geometries. This segmentation allows the structure to have both complexity and localized strength where needed.
Solution Approach 2:
Different portions of the DCD are assigned different wall thicknesses based on their functional requirements. Areas subject to high injection pressure or requiring structural support have increased wall thickness, while areas needing complexity for internal passages maintain thin walls. This local quality variation resolves the contradiction between overall thin-wall design and localized strength requirements.
2Manufacturing precision
If injection pressure is increased to fill complex internal structures, then filling completeness is improved, but the risk of wall rupture increases
Solution Approach 1:
The injection system is segmented into multiple injection points or stages, allowing pressure to be applied progressively through different sections of the DCD. This prevents concentration of high pressure in any single area, enabling complete filling of complex structures while maintaining structural integrity.
Solution Approach 2:
Injection parameters such as pressure, flow rate, and temperature are dynamically adjusted during the injection process. Pressure is increased in stages or directed to specific zones based on filling progress, ensuring complete penetration into complex internal structures without exceeding the rupture threshold of thin walls.
3Device complexity
If wall thickness is reduced to enable thin-walled design, then manufacturing of complex geometries is improved, but dimensional accuracy during shrinkage becomes difficult to control
Solution Approach 1:
The DCD is segmented into zones with different wall thicknesses optimized for their specific functions. Critical dimensional areas maintain sufficient thickness to control shrinkage behavior, while non-critical areas use minimal thickness for complexity. This segmentation allows thin-walled design overall while preserving dimensional accuracy where required.
Solution Approach 2:
Wall thickness is locally optimized based on dimensional criticality. Areas requiring high dimensional accuracy during shrinkage retain greater thickness, while areas where complexity is paramount use minimal thickness. This local quality approach enables the DCD to achieve both thin-walled capability and controlled dimensional accuracy.
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 design enhances the rigidity and burn-off capability of the core die, prevents rupture, ensures complete filling of internal structures, and matches the shrink rate of different portions, resulting in a dimensionally accurate and complete ceramic core.
Implementation Method 1
the slurry must be injected at a pressure sufficient to fill the complex internal structures of the DCD
Implementation Method 2
some portions of the DCD may have regions that are not filled by the slurry. Further, the gap distance defined between the walls of the DCD must be controlled, and portions of the core may shrink at different rates during slurry solidification
Data Source
AI summary
A disposable core die is provided. The disposable core die includes a first portion defining an inlet configured to receive a slurry therethrough, a second portion integrally formed downstream from the first portion and configured to receive the slurry from the first portion, and a third portion integrally formed downstream from the second portion. The second portion includes a plurality of hollow tubes that are substantially coaxially aligned and have a wall thickness within a range defined between about 0.1 mm and about 0.5 mm, and the third portion defines an outlet configured to discharge excess slurry from the second portion.