Laser Beam Profile Control for Uniform 3D Powder Bed Melting
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Solution Overview
Problem
Existing methods for producing three-dimensional components via selective laser melting and selective laser sintering face challenges such as uneven temperature distribution, inefficient energy influx, and limitations in achieving precise edges due to meandering scanning and raster scan methods, which affect the resolution and quality of the components.
Innovation Solution
An irradiation device with a beam-forming system that dynamically adjusts the length and width of the high-energy beam profile, allowing for continuous adaptation of the beam dimensions and alignment to match the geometry of the component, eliminating the need for meandering scanning and optimizing energy distribution across the powder layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If meandering scanning or raster scan methods are used to irradiate powder layers, then the entire area can be covered, but uneven temperature distribution and thermal gradients occur, reducing manufacturing precision and component quality
Solution Approach 1:
The patent applies dynamics by continuously changing the beam profile dimensions (length and width) during the irradiation process. The beam-forming system dynamically adjusts the beam cross-section based on the current position in the processing field, transitioning from a narrow profile at the start of a scan line to a broader profile as the line progresses. This dynamic adaptation ensures uniform energy distribution across the powder layer, eliminating thermal gradients while maintaining complete area coverage.
Solution Approach 2:
The invention implements parameter changes by varying the beam profile parameters (length and width) as a function of position. The control system modifies the beam dimensions in real-time based on the scanner position, using pre-calculated profiles that account for the remaining distance to the end of the scan line. This parameter adaptation optimizes energy influx distribution, preventing both overheating at the start and underheating at the end of each scan line.
2Manufacturing precision
If a narrow beam profile is used to produce precise contours, then edge accuracy is improved, but the irradiation speed and construction rate decrease
Solution Approach 1:
The system dynamically transitions between narrow and broad beam profiles depending on the processing requirements. During contour irradiation, a narrow beam profile is used to achieve precise edges and accurate geometry. During interior region irradiation, the beam profile automatically expands to a broader configuration, enabling faster energy deposition and higher construction rates. This dynamic switching eliminates the need to maintain a narrow profile throughout the entire process.
Solution Approach 2:
The invention applies local quality by using different beam profile characteristics in different regions of the processing field. The skin-core strategy is implemented where the beam profile is narrow when irradiating the skin region (contours and edges) to ensure precision, and broad when irradiating the core region (interior areas) to maximize productivity. This spatially varying beam quality optimizes both precision and speed in their respective zones.
3Productivity
If multiple beam profiles are used to implement skin-core strategy, then irradiation efficiency is improved, but device complexity increases due to additional optical components
Solution Approach 1:
The beam-forming system is designed as a universal device that can produce multiple beam profiles (narrow and broad) using a single integrated optical assembly. Rather than requiring separate optical paths or multiple laser sources, the system uses one beam-forming unit with adjustable parameters that can adapt to generate different profile configurations as needed. This multi-functionality reduces device complexity while maintaining the ability to implement the skin-core strategy.
Solution Approach 2:
The invention achieves multiple beam profiles through parameter changes in a single beam-forming system. By dynamically adjusting the optical parameters (such as lens positioning, aperture size, or focal length) of one beam-forming device, the system generates both narrow and broad beam profiles on demand. This eliminates the need for multiple fixed optical systems, reducing mechanical complexity and the number of switching mechanisms required.
4Manufacturing precision
If the beam profile dimensions are continuously adjusted during irradiation, then energy distribution uniformity is improved, but control system complexity increases
Solution Approach 1:
The control system implements preliminary action by pre-calculating and storing optimal beam profile parameters for each position in the processing field before irradiation begins. During the actual irradiation process, the system simply retrieves and applies the predetermined profile settings based on the current scanner position, rather than performing real-time calculations. This approach ensures uniform energy distribution while minimizing the computational burden and control complexity during operation.
Solution Approach 2:
The system uses feedback from the scanner position sensors to automatically select and apply the appropriate beam profile parameters. The control system continuously monitors the scanner position and adjusts the beam profile dimensions accordingly, ensuring that the correct profile is applied at each location. This closed-loop control simplifies the overall system by using straightforward position-based feedback rather than complex real-time optimization algorithms.
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 efficiency and quality of three-dimensional component production by ensuring uniform energy influx, reducing thermal gradients, and allowing for precise contour tracking without the need for additional scanning steps, thereby improving the construction rate and accuracy.
Implementation Method 1
a powder material is locally melted by a high-energy beam, in particular a laser beam
Implementation Method 2
In so-called selective laser melting (SLM), a powder material is locally melted by a high-energy beam
Implementation Method 3
In so-called selective laser sintering (SLS), a powder material is locally melted by a high-energy beam
Data Source
AI summary
Methods and computer-readable media for producing at least one portion of a layer of a three-dimensional component by irradiating at least one powder layer by at least one high-energy beam, e.g., a laser beam are disclosed. The methods include irradiating the powder layer by the at least one high-energy beam in a processing field, wherein the at least one high-energy beam is moved in a continuous oscillating movement over the powder layer in a first direction to produce a line-shaped irradiation region in which the powder layer is melted, and wherein the line-shaped irradiation region is moved over the powder layer in a second direction that differs from the first to produce the portion of the layer of the three-dimensional component.