Powder Bed Irradiation Control for Geometry-Dependent Overlap Zones
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Solution Overview
Problem
Existing methods for producing three-dimensional work pieces using powder bed fusion struggle with efficient production of large or complex shapes, as they require multiple irradiation units with overlapping areas, leading to suboptimal capacity utilization and increased production time.
Innovation Solution
A method and device for controlling an irradiation system with multiple irradiation units, where each unit is assigned to specific areas on a carrier, and the overlap area is irradiated by both units, allowing for dynamic adjustment of irradiation patterns based on the geometry of the work piece to optimize capacity utilization and reduce production time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple irradiation units are used to produce large three-dimensional work pieces, then the production capacity is improved, but the capacity utilization of each irradiation unit deteriorates due to overlapping areas
Solution Approach 1:
The patent applies dynamics by making the assignment of irradiation units to areas dynamic rather than static. The control device dynamically adjusts which irradiation unit irradiates which area based on real-time geometry data of the work piece. This allows the system to adapt to varying work piece geometries and optimize capacity utilization for each specific production scenario, resolving the contradiction between using multiple units for high productivity and maintaining good capacity utilization.
Solution Approach 2:
The patent changes the parameter of area assignment from fixed to variable. Instead of permanently assigning specific areas to specific irradiation units, the system varies the assignment parameters based on the work piece geometry. The control device calculates optimal area assignments that maximize the utilization of each irradiation unit's capacity while still achieving high productivity through parallel processing of multiple areas.
2Volume of moving object
If multiple irradiation units with overlapping areas are used, then large work pieces can be produced, but the production time increases due to suboptimal capacity utilization
Solution Approach 1:
The dynamic assignment strategy optimizes production time by continuously adapting the irradiation unit allocation to the specific geometry being produced. For large work pieces, the system dynamically determines the most efficient distribution of irradiation tasks across multiple units, minimizing idle time and overlap waste, thereby reducing overall production time while maintaining the ability to produce large volumes.
Solution Approach 2:
The patent ensures continuity of useful action by optimizing the coordination between multiple irradiation units. The control device calculates area assignments that minimize gaps and overlaps in the irradiation coverage, ensuring that all irradiation units are continuously engaged in productive work throughout the production process, thus reducing total production time for large work pieces.
3Ease of operation
If fixed area assignments are used for irradiation units, then the control is simplified, but the adaptability to different work piece geometries deteriorates
Solution Approach 1:
The system maintains ease of operation through automated dynamic assignment. While the assignments are dynamic and adaptive to different geometries, the control complexity is managed by implementing the assignment logic in a control device that automatically calculates optimal distributions based on input geometry data. This eliminates the need for manual reconfiguration while maintaining adaptability to various work piece geometries.
Solution Approach 2:
The control device performs self-service by automatically determining the optimal area assignments for different irradiation units based on the work piece geometry. The system takes the geometry data as input and autonomously calculates and implements the optimal distribution strategy, eliminating the need for external intervention or complex manual programming for each new geometry while maintaining high adaptability.
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 high-efficiency production of complex three-dimensional work pieces by optimizing the use of irradiation units, reducing production time, and maintaining a controlled atmosphere, thus achieving efficient and cost-effective additive layer construction.
Implementation Method 1
a raw material powder layer is applied onto a carrier and subjected to laser radiation in a site selective manner... The laser radiation penetrating into the powder layer causes heating and consequently melting or sintering of the raw material powder particles
Implementation Method 2
subjected to laser radiation in a site selective manner... The laser radiation penetrating into the powder layer causes heating
Implementation Method 3
a radiation beam emitted by the irradiation system is guided over a raw material powder layer according to a radiation pattern
Implementation Method 4
Raw material powder applied onto the overlap area can be selectively irradiated with electromagnetic or particle radiation by at least two irradiation units of the irradiation system
Data Source
AI summary
In a method for controlling an irradiation system for use in an apparatus for producing a three-dimensional work piece, a first and a second irradiation area as well as an overlap area arranged between the first and the second irradiation area are defined on a surface of a carrier adapted to receive layers of a raw material powder to be irradiated with electromagnetic or particle radiation emitted by the irradiation system. A first irradiation unit of the irradiation system is assigned to the first irradiation area and the overlap area, and a second irradiation unit of the irradiation system is assigned to the second irradiation area and the overlap area. At least one of the first irradiation area, the second irradiation area and the overlap area is defined in dependence on a geometry of the three-dimensional work piece to be produced.