Fiber-Based Beam Control for Additive Manufacturing Temperature Uniformity
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Solution Overview
Problem
Current additive manufacturing systems face challenges in achieving adjustable laser beam characteristics without relying on costly and complex free-space optics, and they struggle with rapid and uniform temperature control across powder beds, leading to inefficient processing and stress due to steep temperature gradients.
Innovation Solution
The development of a fiber-based system that adjusts beam characteristics through perturbation devices and confinement regions within the fiber, allowing for variable beam parameters like beam diameter and divergence, combined with optical systems for flattening and homogenizing irradiance profiles to pre-heat and post-heat powder beds uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free-space optics or complex add-on mechanisms are used to vary beam characteristics, then beam adjustability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the beam characteristic adjustment function from external free-space optics and relocates it into the fiber itself through confinement regions with varying refractive indices. This eliminates the need for complex external mechanisms while maintaining adjustability.
Solution Approach 2:
The invention nests multiple confinement regions with different refractive indices within the fiber structure, allowing sequential activation of different regions to achieve variable beam characteristics. Each confinement region acts as a nested functional unit that can be independently controlled.
2Adaptability or versatility
If free-space optics or complex add-on mechanisms are used to vary beam characteristics, then beam adjustability is improved, but cost increases significantly
Solution Approach 1:
The patent merges the beam adjustment function with the fiber delivery system by integrating confinement regions directly into the fiber structure. This consolidation eliminates the need for separate external adjustment mechanisms, reducing overall system cost while maintaining functionality.
3Stability of the object's composition
If conventional heating methods with complex heater filaments and reflector geometries are used, then uniform temperature distribution is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical heating systems (heater filaments and reflector geometries) with an optical-based heating approach using laser beams shaped by confinement regions. This substitution achieves uniform temperature distribution through optical field control rather than mechanical heating elements.
4Temperature
If radiant heaters are used for heating powder bed, then heating capability is provided, but warm-up time increases which negatively affects processing time
Solution Approach 1:
The patent uses confinement regions to pre-shape and pre-position the laser beam energy distribution before it reaches the powder bed. This preliminary energy configuration enables faster heating response and reduced warm-up time compared to conventional radiant heaters that require gradual thermal buildup.
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 solution enables flexible and efficient laser processing by minimizing cost and complexity, reducing stress through controlled cooling rates and achieving uniform temperature across powder beds, thereby improving the overall additive manufacturing process.
Implementation Method 1
an optical system configured to form the generated one or more first optical beams so as to match a portion of a shape of a powder bed. The apparatus, using the formed one or more first optical beams with the flattened irradiance profile, can be configured to pre-heat the powder bed prior to fusing the powder bed, to post-heat the fused powder bed
Implementation Method 2
Additive manufacturing systems typically suffer from very steep spatial temperature gradients, which can cause extremely fast cooling rates after the material (e.g., metal) is melted by a fusing laser beam
Data Source
AI summary
An apparatus for temperature control in additive manufacturing may include: an optical beam source configured to generate one or more optical beams; a homogenizer configured to flatten an irradiance profile of the generated one or more optical beams; and/or an optical system configured to form the generated one or more optical beams so as to match a portion of a shape of a powder bed. The apparatus may include optical beam sources configured to generate two or more optical beams; and/or an optical system configured to form the generated two or more optical beams to match the portion of the shape of the powder bed. The apparatus, using the formed one or more optical beams with the flattened irradiance profile or using the formed two or more optical beams, may be configured to pre-heat the powder bed prior to fusing and/or to post-heat the fused powder bed.