Energy Beam Deflection Sequencing to Prevent Powder Bed Overheating
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Solution Overview
Problem
In laser-based additive manufacturing, the challenge is to prevent overheating of molten powder material, which can lead to product quality issues and process inefficiencies due to the limitations of conventional scanner devices in managing energy beam displacement and heat dissipation.
Innovation Solution
A method and apparatus that utilize a combination of optical and mechanical deflections to displace a continuous energy beam along a sequence of beam positions, allowing for simultaneous or successive changes in optical and mechanical deflections to skip regions between subsequences, ensuring thermally decoupled areas are irradiated, thereby preventing overheating and improving process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous energy beam is used to solidify powder material in laser-based additive manufacturing, then productivity and manufacturing speed are improved, but the risk of overheating and droplet detachment increases
Solution Approach 1:
The patent segments the continuous energy beam into discrete beam positions arranged in sequences with gaps between them. The beam irradiates only specific positions within each sequence rather than continuously scanning across the entire area, dividing the processing into controlled segments that prevent heat accumulation and droplet detachment while maintaining high productivity through rapid sequential processing.
2Manufacturing precision
If the energy beam scans continuously across the work region, then manufacturing precision is improved, but heat dissipation becomes insufficient leading to overheating
Solution Approach 1:
The patent implements periodic action by arranging beam positions in sequences with intentional gaps, where the beam irradiates discrete positions rather than continuously scanning. This periodic irradiation pattern allows thermal energy to dissipate between irradiation events at each position, preventing overheating while maintaining solidification quality through controlled, repeated exposure cycles.
3Device complexity
If conventional scanner devices are used for beam displacement, then device complexity is kept low, but the ability to manage energy beam displacement and prevent overheating is limited
Solution Approach 1:
The patent applies dynamics by enabling the scanner device to rapidly switch between different beam positions in sequences rather than following continuous扫描 paths. This dynamic positioning approach allows the system to jump between discrete positions, controlling heat input and preventing overheating while maintaining relatively simple scanner device architecture.
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 enables the use of higher energy inputs without overheating, enhances productivity by allowing simultaneous formation of multiple melt tracks, and improves the quality of additive manufactured components by controlling energy distribution and heat dissipation.
Implementation Method 1
the optical deflection is configured to deflect the energy beam around each of the irradiation positions within a beam region of the deflection device onto at least one beam position of the sequence of beam positions
Implementation Method 2
the mechanical deflection is configured to position the energy beam at a plurality of irradiation positions arranged within the work region and substantially spanning the work region
Implementation Method 3
emitting the continuous energy beam in a direction of the powder material so as to form a layer of a component part within the scope of an additive manufacturing method
Data Source
AI summary
A method for displacing a continuous energy beam includes emitting a continuous energy beam in a direction of a powder material and displacing the energy beam by overlaying an optical deflection of the energy beam using of a deflection device and a mechanical deflection of the energy beam using of a scanner device. The mechanical deflection is configured to position the energy beam at a plurality of irradiation positions, and the optical deflection is configured to deflect the energy beam around each of the irradiation positions within a beam region of the deflection device onto at least one beam position in a sequence of beam positions. The optical deflection and the mechanical deflection are controlled such that the energy beam successively scans subsequences with an abrupt change of the optical deflection such that two spatially separated subsequences are successively adopted by the energy beam.