Rotatable Belt Heat Capacitor for Additive Manufacturing
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Solution Overview
Problem
Additive manufacturing systems face challenges in efficiently building 3D parts and support structures due to limitations in layer transfusion techniques, particularly in achieving rapid printing speeds while maintaining interlayer adhesion and preventing heat accumulation, which can lead to deformation of the 3D part.
Innovation Solution
The system employs a rotatable belt with high thermal inertia, a heater, and rollers to thermally conduct heat into the 3D part, allowing for rapid layer transfusion by heating the imaged layer to a fusion temperature and then transferring it to the part, with a transfixing step to ensure clean release and maintain adhesion, and active cooling to manage heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid printing speeds are pursued, then productivity is improved, but interlayer adhesion deteriorates due to insufficient heat transfer time
Solution Approach 1:
The belt is pre-heated to a high temperature (e.g., 100°C or higher) before the layer transfer process. This preliminary heating of the belt ensures that when the imaged layer is transferred to the part, sufficient heat is already available to achieve proper fusion and adhesion, even at rapid printing speeds without requiring extended heating time during the transfer process
2Productivity
If high printing speeds are used, then productivity is improved, but heat accumulation causes deformation of the 3D part
Solution Approach 1:
The belt is designed with spatially varying thermal properties: the portion of the belt in contact with the imaged layer is maintained at high temperature to facilitate layer fusion, while other portions of the belt are allowed to cool or are actively cooled. This local temperature differentiation enables high printing speeds without causing excessive heat accumulation and deformation in the 3D part
3Strength
If the belt temperature is increased to improve layer fusion, then interlayer adhesion is improved, but heat-induced deformation of the part increases
Solution Approach 1:
The belt undergoes periodic heating and cooling cycles as it rotates through different zones. The belt is heated in the transfer zone to facilitate layer fusion, then cools in subsequent zones. This periodic thermal action allows the belt to provide high temperature only where and when needed for adhesion, while avoiding continuous heat accumulation that would cause part deformation
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 faster printing speeds with improved interlayer adhesion and reduced heat-induced deformation, allowing for the production of 3D parts with enhanced structural integrity and density.
Implementation Method 1
a rotatable belt configured to conduct thermal energy from the heater into the three-dimensional part while the pressed imaged layer moves between the nip roller and the release roller
Implementation Method 2
a first heater configured to heat the rotatable belt and the imaged layer on the rotatable belt
Data Source
AI summary
An additive manufacturing system comprising a transfer medium configured to receive the layers from a imaging engine, a heater configured to heat the layers on the transfer medium, and a layer transfusion assembly that includes a build platform, and is configured to transfuse the heated layers onto the build platform in a layer-by-layer manner to print a three-dimensional part.