Micromirror Beam Overlap for Precise Powder Bed Fusion Heating
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Solution Overview
Problem
Existing additive manufacturing systems face challenges in achieving precise control over energy beam intensity and power density, leading to limitations in the resolution and quality of three-dimensional objects produced in powder bed fusion processes.
Innovation Solution
The use of an optical modulator with a micromirror array and focusing lens assembly to manipulate energy beams, allowing for a conduction irradiation regime with lower intensity and power density, enabling increased resolution and improved temperature control, resulting in finer features and better material properties of three-dimensional objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high intensity and power density energy beam is used for powder bed fusion, then melting and sintering of powder material is achieved, but resolution and quality of three-dimensional objects are limited
Solution Approach 1:
The energy beam is divided into multiple beam segments by the optical modulator, which can independently control each segment. This segmentation allows for precise spatial distribution of energy, enabling high resolution manufacturing without requiring excessive overall beam intensity, thus resolving the contradiction between manufacturing precision and temperature control.
Solution Approach 2:
The optical modulator dynamically adjusts the intensity and positioning of individual beam segments in real-time based on the specific manufacturing requirements. This dynamic control enables the system to deliver high intensity only where and when needed, while maintaining lower overall power density, thereby achieving both high resolution and controlled temperature.
2Temperature
If optical modulator with micromirror array is used to manipulate energy beams, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical temperature control systems with an optical-based control mechanism. The optical modulator uses electronically controlled micromirrors to manipulate beam positioning and intensity, substituting mechanical adjustment with optical control, thereby achieving superior temperature control while the complexity is managed through electronic rather than mechanical means.
3Reliability
If conduction irradiation regime is used to maintain powder material below vaporization temperature, then material properties are improved, but energy beam intensity must be reduced
Solution Approach 1:
The optical modulator applies the local quality principle by delivering customized energy distribution to different regions of the powder bed. High intensity can be applied locally where melting is required, while other regions receive lower intensity to prevent vaporization. This localized control enables maintenance of material properties below vaporization temperature while still achieving effective processing where needed.
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 allows for higher resolution and improved temperature control, enabling the production of three-dimensional objects with smaller features, better surface properties, and greater dimensional tolerances, while utilizing a conduction irradiation regime that maintains the powder material below its vaporization temperature.
Implementation Method 1
an optical modulator with a micromirror array and focusing lens assembly to manipulate energy beams
Implementation Method 2
focusing lens assembly to manipulate energy beams, allowing for a conduction irradiation regime with lower intensity and power density, enabling increased resolution and improved temperature control
Implementation Method 3
an energy beam generated by an irradiation device is directed onto a powder bed to melt and/or sinter sequential layers of powder material
Implementation Method 4
an energy beam generated by an irradiation device is directed onto a powder bed to melt and/or sinter sequential layers of powder material
Data Source
AI summary
An irradiation device for additively manufacturing three-dimensional objects may include a beam generation device configured to generate an energy beam, an optical modulator including a micromirror array disposed downstream from the beam generation device, and a focusing lens assembly disposed downstream from the optical modulator. The micromirror array may include a plurality of micromirror elements configured to reflect a corresponding plurality of beam segment of the energy beam along a beam path incident upon the focusing lens assembly. The focusing lens assembly may include one or more lenses configured to focus the plurality of beam segments such that for respective ones of a plurality of modulation groups including a subset of micromirror elements, a corresponding subset of beam segments are focused to at least partially overlap with one another at a combination zone corresponding to the respective modulation group.