Laminate Molding Gas Ejection for Fume Removal
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Solution Overview
Problem
In laminate molding processes, fumes generated during solidification can adversely affect the quality of the molded object, and increasing gas flow rates to remove these fumes often results in the loss of small particles, leading to a rough structure.
Innovation Solution
A laminate molding method and apparatus that involves forming a metal powder layer, applying electromagnetic energy, and rotating the table relative to the energy source while emitting gas from a central port to maintain gas speed and direct fumes away from the molding area, ensuring efficient fume removal without losing small particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the flow rate of gas is increased to remove fumes, then fume removal efficiency is improved, but particles with small diameters are carried away while particles with large diameters remain, causing the molded object structure to become rough
Solution Approach 1:
The gas supply system is segmented into multiple gas supply holes distributed across the table surface rather than a single centralized inlet. This segmentation allows gas to be supplied locally at multiple positions, improving fume removal efficiency while maintaining controlled gas flow that prevents excessive particle carryaway, thus preserving molded object structure quality.
Solution Approach 2:
Gas supply is implemented with local quality by providing gas supply holes at specific locations (including the center and distributed across the table) rather than uniform distribution. This allows optimized local gas flow rates that effectively remove fumes from melting areas while avoiding excessive flow that would carry away small particles and roughen the molded object surface.
2Object-affected harmful factors
If gas is supplied from the center of the table, then fume removal is effective, but the gas flow speed decreases toward the outlet, causing particles to remain and structure to become rough
Solution Approach 1:
The gas supply system is divided into multiple gas supply holes distributed across the table surface. This segmentation ensures that gas is supplied at multiple locations simultaneously, maintaining higher gas flow speeds throughout the melting area and improving fume removal effectiveness without the speed degradation that occurs with a single centralized supply point.
Solution Approach 2:
The gas supply arrangement transitions from a one-dimensional linear flow (inlet to outlet) to a two-dimensional distributed network of gas supply holes across the table surface. This dimensional change allows gas to reach multiple melting areas simultaneously, maintaining higher flow speeds and improving fume removal without the progressive speed loss inherent in linear flow systems.
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 effectively removes fumes, preventing them from affecting the molded object and allowing for the formation of precise structures by maintaining gas speed and directing fumes outward, thus enhancing molding speed and quality.
Implementation Method 1
a melting step of melting the metal powder layer by applying, to the metal powder layer, electromagnetic energy emitted from an electromagnetic energy source
Implementation Method 2
Gas is emitted from a gas emission port toward an outer side of the table, the gas emission portion being provided in generally a center of the table
Data Source
AI summary
Provided is a laminate molding method for additionally manufacturing a molded object on a table by use of metal powder. The laminate molding method includes: a metal powder layer forming step of forming a metal powder layer by supplying metal powder onto a table; a melting step of melting the metal powder layer by applying, to the metal powder layer, electromagnetic energy emitted from an electromagnetic energy source; a rotating step of rotating the electromagnetic energy source and the table relative to each other; and a table vertically moving step of vertically moving the table relative to the electromagnetic energy source. Gas is emitted from a gas emission port toward an outer side of the table, the gas emission portion being provided in generally a center of the table.