Additive Manufacturing of Selective Density Gradients in Functional Areas
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Solution Overview
Problem
Existing additive manufacturing techniques lack the ability to selectively locate density gradients within printed articles, particularly in functional areas that require higher mechanical stress, wear, or thermal cycling resistance.
Innovation Solution
A method involving additive manufacturing to print a body from a powder composition, selectively locating unprinted loose powder regions defined by a printed boundary, which are then sintered to achieve higher density than the printed boundary and body, enhancing mechanical properties in functional areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additive manufacturing is used to print articles, then manufacturing freedom and design flexibility are improved, but the ability to selectively locate density gradients in functional areas is lost
Solution Approach 1:
The patent applies local quality by creating different density regions within the printed article - specifically, leaving unprinted loose powder in selected functional areas while printing boundaries around these areas. This results in high-density regions at functional locations (where wear and stress occur) versus lower-density regions elsewhere, allowing tailored mechanical properties at specific locations without compromising overall design freedom
Solution Approach 2:
The patent segments the printed article into distinct regions with different density characteristics. By defining boundaries that enclose unprinted loose powder regions, the article is divided into high-density functional areas and lower-density non-functional areas, enabling selective density control without affecting the overall manufacturing process
2Manufacturing precision
If high density is achieved throughout the entire printed article, then overall quality is improved, but production efficiency and cost-effectiveness deteriorate
Solution Approach 1:
Instead of achieving uniform high density throughout the entire article, the patent applies local quality by concentrating high density only in functional areas where it is needed. The unprinted loose powder regions are strategically placed in areas experiencing high wear and stress, while other areas can be manufactured more efficiently without compromising overall article performance
Solution Approach 2:
The patent applies partial action by providing high density only where functionally required rather than throughout the entire article. This selective approach avoids the excessive action of densifying the entire structure, thereby reducing production time and energy consumption while maintaining necessary performance in critical areas
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
The method results in sintered articles with enhanced mechanical properties, such as wear resistance, fracture toughness, and thermal cycling resistance, by selectively locating high-density regions in functional areas without compromising overall article performance and quality.
Implementation Method 1
The printed body, printed boundary, and the unprinted loose powder region are sintered to provide the sintered article, wherein the sintered unprinted loose powder region has a density higher than sintered printed boundary and sintered printed body
Data Source
AI summary
In one aspect, additive manufacture techniques are described herein which enable the selective location of one or more density gradients within printed articles. Methods described herein can permit high density and high quality printed regions to be located at one or more selected areas of the printed article. The high density/high quality printed regions, for example, can be located at functional areas of the printed article, such as areas of high wear and/or stress.