Heat-Radiating Elements for Selective Surface Heating in 3D Printing
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Solution Overview
Problem
Existing powder bed fusion processes for 3D printing face challenges in achieving rapid and uniform heating of the powder bed surface while minimizing thermal stress on deeper layers, leading to issues like warpage and increased material aging due to excessive temperature.
Innovation Solution
Employing heat-radiating elements that emit radiation with a maximum intensity at wavelengths of 5000 nm or longer, allowing for selective heating of the surface without excessively heating deeper layers, using high-surface-area elements from multiple directions and varying irradiation power to control temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If heat-radiating elements with maximum radiation intensity at wavelengths of about 1400 nm are used to heat the powder bed surface, then the surface heating speed is improved, but deeper layers are excessively heated causing thermal stress and material aging
Solution Approach 1:
The patent applies local quality by using heat-radiating elements with specific wavelength characteristics (maximum intensity at 5000 nm or longer) that are selectively absorbed by the surface powder layer. This creates a localized heating effect at the surface while minimizing energy penetration to deeper layers, thus achieving rapid surface heating without excessive thermal stress on underlying material.
Solution Approach 2:
The patent changes the wavelength parameter of the radiation from conventional 1400 nm to 5000 nm or longer wavelengths. This parameter change fundamentally alters the penetration depth and absorption characteristics of the radiation, enabling selective surface heating while protecting deeper layers from excessive thermal exposure and material aging.
2Manufacturing precision
If the temperature of the powder bed surface is increased to minimize warpage, then the quality of melted layers is improved, but the polymer material undergoes accelerated aging and thermal degradation
Solution Approach 1:
The patent uses radiation with maximum intensity at 5000 nm or longer wavelengths that is selectively absorbed by the surface powder layer. This creates a localized heating effect precisely where needed for warpage control, while the deeper layers remain relatively cool, preventing bulk material aging and thermal degradation.
Solution Approach 2:
By changing the radiation wavelength parameter to 5000 nm or longer, the patent achieves a temperature profile where the surface reaches optimal melting temperature for minimizing warpage, while the bulk material remains below degradation thresholds, thus simultaneously improving manufacturing precision and material reliability.
3Temperature
If conventional radiant heating means are used to heat the powder bed, then the process temperature can be controlled, but the build process takes many hours resulting in high thermal stress accumulation
Solution Approach 1:
The patent changes the wavelength parameter from conventional 1400 nm to 5000 nm or longer, which fundamentally increases the heating efficiency. This parameter change enables rapid temperature control at the surface while minimizing heat penetration to deeper layers, thus reducing total process time and accumulated thermal stress without sacrificing temperature control precision.
Solution Approach 2:
The use of high-wavelength radiation (5000 nm or longer) allows the process to 'rush through' the heating phase much faster than conventional methods. The surface powder layer is rapidly heated to the required temperature, significantly reducing the time needed for each layer and thereby increasing overall build speed while maintaining adequate temperature control.
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 enables rapid and uniform heating of the surface powder layer with minimal thermal stress on lower layers, reducing warpage and material aging, thus improving the efficiency and quality of 3D printing processes.
Implementation Method 1
The heating of the powder material is effected by means of a radiation having a maximum radiation intensity at a wavelength of 5000 nm or longer wavelengths
Data Source
AI summary
A process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects is performed by a) applying a layer of a powder material solidifiable under the action of electromagnetic radiation, b) heating the powder material to not more than 10 K below the melting point according to DIN 53765 by a radiation from a heat-radiating element whose maximum radiation intensity is at a wavelength of 5000 nm or at longer wavelengths, c) selective melting/sintering of at least a region of the powder material which corresponds to the cross section of the three-dimensional object, d) repeating steps a) to c) until the three-dimensional object is obtained.