Removable Inner Shell for Dross Control in Metal Printers
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Solution Overview
Problem
The formation of dross on the surface of liquid metal in metal printers interferes with accurate level measurement, leading to incorrect monitoring and potential cessation of printing due to incorrect indication of liquid metal levels.
Innovation Solution
A printer component featuring a replaceable inner shell made from materials like graphite, with a flow path and dross containment design that directs dross accumulation on the inner shell, allowing for easy removal and replacement, thereby preventing dross buildup on the printer's walls and ensuring accurate liquid metal level monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If dross accumulates on the reservoir walls and liquid metal surface, then dross containment is achieved, but liquid metal level measurement accuracy deteriorates
Solution Approach 1:
The reservoir is divided into two functional zones: an inner removable shell that collects dross and an outer reservoir structure that maintains liquid metal. This segmentation allows dross to be contained in the inner shell while keeping the outer measurement area clean, resolving the contradiction between dross containment and measurement accuracy.
Solution Approach 2:
The inner removable shell acts as an intermediary component between the liquid metal and the reservoir walls. It intercepts dross before it can accumulate on the measurement-critical outer surfaces, allowing dross containment without compromising measurement precision.
2Ease of repair
If the inner shell is made removable and replaceable, then ease of maintenance improves, but device complexity increases
Solution Approach 1:
The reservoir structure is segmented into a removable inner shell and a fixed outer reservoir. The inner shell can be independently removed and replaced without disassembling the entire reservoir, simplifying maintenance while adding only minimal structural complexity through the removable component design.
3Productivity
If the inner shell contains flow paths for print fluid, then print material flow efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The inner shell incorporates porous walls with controlled porosity that allow liquid metal to pass through while filtering dross. This porous structure provides inherent flow paths without requiring precise geometric features, maintaining manufacturing feasibility while ensuring efficient print material flow and dross containment.
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
Prevents dross buildup on critical printer components, ensuring accurate measurement of liquid metal levels and maintaining continuous printing operations by containing dross on a removable inner shell, which can be cleaned or replaced, thus avoiding interruptions.
Implementation Method 1
The laser beam is reflected from the upper surface of the liquid metal, and the reflected laser beam is detected using one or more photosensors
Implementation Method 2
One type of printer employs magnetohydrodynamics (MHD) technology to manipulate an electrically conductive print fluid or print material such as liquid metal, for example molten aluminum, using a magnetic field to eject a single drop or volume of the print material from a nozzle
Implementation Method 3
The solid metal is heated within the supply reservoir to a temperature sufficient to melt the solid metal and to maintain a level of liquid metal within the supply reservoir
Data Source
AI summary
An implementation of the present teachings includes inner shell for a printer, such as a liquid metal printer, that mitigates problems associated with the formation of dross. The inner shell can be installed in a reservoir of the printer during a printing process where, during the printing process, a dross can form on an interior sidewall of the inner shell. Subsequently, the inner shell can be removed and either cleaned or replaced. During printing, the inner shell can be raised and/or lowered, or otherwise repositioned, so that the dross forms over a larger surface area of the inner shell, and at a decreased thickness, compared to an inner shell that is not repositioned.