3D Printing Modifying Agent Controls Thermal Bleed
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Solution Overview
Problem
In 3D printing, the issue of coalescence bleed occurs, leading to reduced dimensional accuracy and surface finish quality due to unwanted solidification of sinterable material beyond intended boundaries, which is not addressed effectively by existing methods.
Innovation Solution
A method involving the selective application of a modifying agent to control thermal energy propagation, using a combination of coalescent and modifying agents to manage coalescence bleed, where the modifying agent is applied to prevent unwanted curing of sinterable material, and its quantity and position are determined using thermal diffusion characteristics and computational modeling to enhance accuracy and finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coalescent agent is applied to fuse sinterable material, then material bonding is improved, but dimensional accuracy deteriorates due to coalescence bleed
Solution Approach 1:
The patent applies different agents to different regions: coalescent agent is applied only within the cross-section boundaries to promote bonding, while modifying agent is applied to the area outside the cross-section to prevent coalescence. This spatial differentiation of material properties resolves the contradiction by allowing strong bonding where needed while preventing dimensional accuracy degradation at boundaries.
Solution Approach 2:
The modifying agent acts as an intermediary substance applied to the area outside the cross-section. It modifies the thermal and surface properties of the sinterable material in the boundary region, preventing unwanted coalescence and maintaining dimensional accuracy while allowing the coalescent agent to perform its bonding function within the cross-section.
2Strength
If sintering temperature is increased to improve material fusion, then bonding strength is improved, but coalescence bleed increases reducing surface finish quality
Solution Approach 1:
The modifying agent creates local property differentiation by being applied specifically to the area outside the cross-section. This prevents thermal energy from causing coalescence in boundary regions while allowing high temperature fusion within the cross-section, thus maintaining both bonding strength and surface finish quality.
Solution Approach 2:
The modifying agent is applied before sintering to preemptively prevent coalescence in the boundary area. This preliminary protective action counteracts the potential harmful effect of thermal energy propagation during sintering, allowing high temperature processing without compromising surface finish quality.
3Stability of the object's composition
If thermal energy is applied to fuse material, then material consolidation is improved, but unwanted curing beyond boundaries occurs
Solution Approach 1:
The modifying agent serves as an intermediary layer between the sinterable material and the environment outside the cross-section. It modifies the thermal response of the boundary material, preventing thermal energy from causing unwanted curing beyond the intended boundaries while allowing complete consolidation within the cross-section.
Solution Approach 2:
The modifying agent changes the thermal parameters (conductivity, capacity, or phase transition characteristics) of the sinterable material in the boundary region. This parameter modification creates a thermal barrier that confines the curing process within the cross-section boundaries while maintaining effective consolidation where the coalescent agent is applied.
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 reduces or eliminates coalescence bleed, improving the dimensional accuracy and surface finish of 3D printed parts by controlling thermal energy distribution and preventing unwanted curing, potentially eliminating the need for post-processing techniques.
Implementation Method 1
a coalescent agent is selectively deposited in contact with the selected region of the sinterable material... This coalescent agent is capable of absorbing radiation and converting the absorbed radiation to thermal energy, which in turn melts or sinters the sinterable material
Implementation Method 2
the thermal energy may propagate into surrounding sinterable material... The effects of coalescence bleed may be managed by delivering an example of the modifying agent disclosed herein to appropriate portion(s) of the sinterable material prior to radiation exposure
Data Source
Figure 1
Figure 2A~2D
Figure 2E~3
AI summary
In a computational modeling method for identifying how to apply a modifying agent during a three-dimensional (3D) printing method, a thermal diffusion model of a layer of a 3D object to be formed from a portion of a sinterable material using the 3D printing method is created. The thermal diffusion model is created by a computer running computer readable instructions stored on a non-transitory, tangible computer readable storage medium. A quantity of the modifying agent to be selectively applied is calculated, by the computer, based upon the thermal diffusion model.