Localized Preheating in Additive Manufacturing Apparatus
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Solution Overview
Problem
Current additive manufacturing (AM) preheating methods face challenges such as high energy inefficiency, temperature inconsistencies, and material degradation due to residual stresses and oxidation, particularly in bulk and surface preheating techniques, as well as inefficiencies in vapor and spatter removal.
Innovation Solution
An additive manufacturing apparatus with a preheating arrangement that focuses electromagnetic energy specifically onto a smaller scan area, allowing for precise temperature control and reduced energy consumption, combined with a movable setup to align the preheating zone with the scan area and integrated vapor/spatter extraction systems for improved removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bulk preheating is used to elevate material bed temperature, then material is more easily processed and moisture is removed, but energy consumption is high and temperature distribution is non-uniform
Solution Approach 1:
The patent applies local quality by transitioning from bulk preheating of the entire material bed to localized preheating only in the scan area where consolidation occurs. The preheating arrangement focuses electromagnetic energy specifically on the scan area, providing uniform temperature distribution only where needed, thereby reducing overall energy consumption while maintaining effective processing temperature in the active zone.
2Temperature
If heating sources are positioned at outer extremities for bulk preheating, then material bed temperature is elevated, but temperature is higher near heating sources and lower farther away causing non-uniform distribution
Solution Approach 1:
The preheating arrangement provides uniform temperature distribution specifically in the scan area through focused electromagnetic energy application. By limiting the preheating zone to match the scan area boundaries, the system achieves homogeneous temperature where consolidation occurs, eliminating the temperature gradients that plague bulk preheating methods.
3Productivity
If the entire material area is preheated, then material is ready for consolidation across the whole bed, but energy consumption increases and processing time extends
Solution Approach 1:
The patent extracts the preheating function from the entire material bed and confines it to only the scan area. This selective approach means that only the portion of material that will be consolidated in each pass receives preheating treatment, significantly reducing the total preheating time and energy requirements while maintaining readiness of material where it is actually needed.
4Quantity of substance
If preheating is applied to larger areas, then more material is prepared for consolidation, but vapor and spatter generation increases requiring more extensive removal systems
Solution Approach 1:
By confining preheating to the scan area boundaries, the system limits the volume of material exposed to elevated temperatures. This localized approach reduces the total quantity of material that generates vapor and spatter during consolidation, thereby decreasing the burden on vapor and spatter removal systems while maintaining effective processing of the necessary material volume.
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 enhances energy efficiency, reduces residual stresses, minimizes material degradation, and effectively manages vapor and spatter removal, enabling the production of larger and more complex parts with improved material properties.
Implementation Method 1
a preheating arrangement which is configured to focus electromagnetic energy substantially onto the scan area
Implementation Method 2
a scanning unit configured to consolidate deposited material in a scan area on the surface of the material bed
Data Source
AI summary
An additive manufacturing apparatus is disclosed. The apparatus includes a build platform, a scanning unit and a preheating arrangement. Material is operatively deposited on the build platform to form a material bed, with a surface of the material bed defining a material area. The scanning unit is configured to consolidate deposited material in a scan area on the surface of the material bed, wherein the scan area forms part of and is substantially smaller than the material area. The preheating arrangement is configured to focus energy onto the surface of the material bed substantially in the scan area and not in the remainder of the material area. A method of preheating material in an additive manufacturing apparatus, a method of forming an object by additive manufacturing and a preheating arrangement for an additive manufacturing apparatus are also disclosed.