High-Speed Sintering Thermal Control for 3D Printed Parts
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Solution Overview
Problem
Existing High-Speed Sintering (HSS) methods face challenges such as powder aging, low recycling rates, high process costs, and temperature gradients that lead to issues like curling, warping, and inaccuracy in 3D printed parts.
Innovation Solution
The method involves using a selective application of absorbers to create temperature differences between areas with and without absorbers, allowing for controlled heating and sintering. This is achieved through a combination of emitters with specific wavelengths for heating and sintering steps, and the use of a jacket with increased temperature to control thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-droplet binder input method is used to achieve high-speed sintering, then productivity is improved, but manufacturing precision deteriorates due to shrinkage during solidification
Solution Approach 1:
The patent uses controlled phase transition of the binder from liquid to solid state to achieve selective bonding of powder particles. By controlling the freezing point and solidification process of the binder, the method achieves both rapid setting (high productivity) and minimal shrinkage (high precision). The binder transitions from liquid state during deposition to solid state during cooling, creating strong bonds without excessive volume reduction.
2Strength
If high temperature is applied to achieve complete sintering, then strength is improved, but powder aging increases due to thermal damage
Solution Approach 1:
The patent applies localized heating only to the areas where binder is deposited, rather than heating the entire powder bed uniformly. This selective thermal treatment ensures that sintering occurs only in the necessary regions, achieving sufficient component strength while minimizing thermal exposure of the surrounding powder to prevent aging and maintain recyclability.
Solution Approach 2:
The patent uses rapid heating and cooling cycles that quickly pass through the critical temperature zone where powder degradation occurs. The brief thermal exposure is sufficient to activate binder solidification and achieve bonding, but too short to cause significant thermal damage to the powder properties, thus maintaining powder recyclability.
3Temperature
If uniform heating is applied to the entire construction field, then temperature distribution is improved, but energy consumption increases
Solution Approach 1:
The patent applies heating selectively only to the regions where binder has been deposited and where sintering is required. This localized thermal treatment achieves the necessary temperature uniformity in the bonded regions without wasting energy heating the entire construction field, thus improving energy efficiency while maintaining adequate temperature distribution for complete sintering.
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 reduces powder aging due to thermal damage, allows for uniform and controllable temperature distribution, and improves the manufacturing results by reducing temperature gradients and process-related issues.
Implementation Method 1
the heating step to said basic temperature is effected by an emitter with a wavelength of approximately 3-8 μm, preferably approximately 5 μm
Implementation Method 2
one or more liquids or particulate material of one or more absorbers is/are selectively applied, this layer is heated in a first heating step to a basic temperature of the powder without the absorber
Implementation Method 3
the sintering step is effected by an emitter with a wavelength of approximately 0.5-1.5 μm, preferably 0.9-1.1 μm, more preferably 1 μm
Implementation Method 4
a second sintering step leads to selective solidification, by heat input, of the areas printed with absorber, at a sintering temperature above the melting temperature of the powder
Data Source
AI summary
The invention relates to a method and an apparatus for producing three-dimensional models by layering in a high-speed sintering process.