Coalescing Agent Control for Additive Manufacturing Density
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Solution Overview
Problem
Additive manufacturing systems face challenges in controlling the properties of three-dimensional objects, such as density, mechanical strength, and thermal properties, due to variations in coalescing agent concentration and contone density in the solidification process.
Innovation Solution
A system and method for controlling the concentration of coalescing agent and contone density in additive manufacturing, using a controller to selectively deliver mixtures of coalescing agent and carrier onto build material layers, allowing for precise control of object properties by adjusting coalescing agent loading and fluid loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If coalescing agent concentration and contone density are not controlled, then the additive manufacturing process is simpler, but the object properties (density, mechanical strength, thermal properties) vary widely
Solution Approach 1:
The patent applies parameter changes by systematically varying coalescing agent concentration and contone density to control object properties. The system modifies these parameters during the additive manufacturing process to achieve desired density, mechanical strength, and thermal properties, directly resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent implements feedback control by monitoring object properties during manufacturing and adjusting coalescing agent delivery parameters accordingly. This closed-loop approach ensures consistent object properties while managing process complexity through automated control mechanisms.
2Strength
If coalescing agent concentration is increased to improve solidification, then coalescence and solidification degree increase, but object density and mechanical strength may become inconsistent
Solution Approach 1:
The patent applies local quality by delivering coalescing agent at varying concentrations and contone densities to different regions of the build material. This spatial variation in agent delivery ensures consistent solidification and object properties throughout the entire object, preventing density and strength inconsistencies that would arise from uniform high concentration application.
Solution Approach 2:
The system dynamically adjusts coalescing agent concentration and contone density parameters during manufacturing to maintain optimal solidification degree while ensuring consistent object composition. This parameter control prevents over-solidification in some regions and under-solidification in others, maintaining both strength and density consistency.
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
Enables precise control over object properties like density, mechanical strength, and thermal properties, improving the quality and consistency of three-dimensional objects produced by additive manufacturing.
Implementation Method 1
the coalescing agent may act as an absorber of applied energy such that the portions of build material having coalescing agent experience coalescence and solidification
Implementation Method 2
the carrier may contribute to decreasing the degree of coalescence and solidification e.g. due to a cooling effect of the carrier. For example, the carrier may cool the build material by evaporative cooling or another mechanism.
Data Source
AI summary
In some examples, at least one agent distributor may be to selectively deliver mixtures of coalescing agent and carrier onto portions of a layer of build material at variable coalescing agent concentrations and variable contone densities. A controller may be to control the at least one agent distributor to selectively deliver the mixture to a portion of the layer at a selected coalescing agent concentration and a selected contone density.