3D Printing Cooling Agent Delivery for Coalescence Bleed Control
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Solution Overview
Problem
Additive manufacturing systems face challenges in producing high-quality three-dimensional objects due to 'coalescence bleed,' where excess heat from the solidification process causes unintended solidification of build material, leading to deformations and reduced accuracy, especially with materials of low heat conductivity.
Innovation Solution
The system employs a method where a cooling agent is selectively delivered to specific portions of the build material to achieve a uniform temperature distribution, reducing coalescence bleed by dispersing excess heat and ensuring only intended portions solidify.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If energy is applied to cause solidification of build material, then three-dimensional objects are generated, but coalescence bleed occurs causing deformations and reduced accuracy
Solution Approach 1:
The patent converts the harmful effect of excess heat (coalescence bleed) into a beneficial effect by using that same heat to pre-warm the build material before selective solidification. The heat that would otherwise cause unwanted solidification is instead utilized to prepare the material, and then selective cooling is applied to achieve precise solidification only where intended.
Solution Approach 2:
The patent applies different thermal treatments to different regions of the build material. A cooling agent is selectively delivered to specific portions to create local temperature differences, ensuring that solidification occurs only in intended areas while preventing coalescence bleed in other areas. This local differentiation of thermal properties resolves the contradiction between achieving solidification and preventing unwanted spread.
2Manufacturing precision
If cooling agent is selectively delivered to disperse excess heat, then coalescence bleed is reduced, but system complexity increases
Solution Approach 1:
The cooling agent delivery system serves multiple functions: it cools the build material to prevent coalescence bleed, it creates uniform temperature distribution, and it enables selective solidification. By making the cooling system multi-functional, the patent reduces overall system complexity rather than adding separate systems for each function.
Solution Approach 2:
The system uses the heat generated during the solidification process itself to pre-warm the build material, then uses selective cooling to achieve the desired solidification pattern. This self-service approach utilizes the process's own thermal energy rather than requiring entirely separate heating and cooling systems, thereby reducing complexity.
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 the accuracy and strength of three-dimensional objects by preventing unwanted solidification, thereby improving the overall quality of the manufactured objects.
Implementation Method 1
a cooling agent is selectively delivered to specific portions of the build material to achieve a uniform temperature distribution, reducing coalescence bleed by dispersing excess heat
Implementation Method 2
Additive manufacturing systems that generate three-dimensional objects on a layer-by-layer basis have been proposed as a potentially convenient way to produce three-dimensional objects
Data Source
AI summary
In one example, an apparatus for generating a three-dimensional object includes an energy source to apply energy to a layer of build material to cause a first portion of the layer to coalesce and solidify, an agent distributor to selectively deliver a cooling agent onto a second portion of the layer, and a controller to control the energy source to apply energy to the layer to cause the first portion to coalesce and solidify in a first pattern and to control the agent distributor to selectively deliver the cooling agent onto the second portion of the layer in a second pattern independent of the first pattern.