Energy Beam Focal Position Detection From Melt Pool Radiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The determination of the focal position of an energy beam in additive manufacturing processes is cumbersome and time-consuming, requiring separate preparation and mounting of metal sheets within the process chamber, and can only be performed before the manufacturing process, not during.
Innovation Solution
An apparatus and method that uses a determination device to determine the focal position of an energy beam by emitting radiation from an irradiation region, allowing for real-time adjustment during the manufacturing process, without the need for pre-preparation of test objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate metal sheets are prepared and mounted in advance to determine focal position, then measurement accuracy is improved, but preparation time and process complexity increase
Solution Approach 1:
The build material itself serves as the determination means for focal position measurement. The energy beam irradiates the build material to generate an irradiation region, and radiation emitted from this region is used to determine the focal position. This eliminates the need for separate metal sheets or calibration objects, as the system uses its own operational materials and processes for self-diagnosis.
Solution Approach 2:
The determination means (build material) is already in place within the process chamber before the additive manufacturing process begins. No additional preparation or mounting of separate test objects is required, as the build material is deposited and ready to serve dual purposes: both as manufacturing material and as the medium for focal position determination.
2Measurement precision
If separate metal sheets are mounted in the process chamber for focal position determination, then measurement accuracy is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The build material serves multiple functions simultaneously: it is both the material to be consolidated for additive manufacturing and the determination means for focal position measurement. The irradiation region generated in the build material provides radiation for diagnosis while the build material itself is being processed, eliminating the need for separate calibration objects or procedures.
Solution Approach 2:
The focal position determination process is merged with the additive manufacturing process itself. The energy beam performs both consolidation of build material and generation of irradiation regions for diagnosis. This integration eliminates separate determination steps and the need for mounting separate metal sheets, simplifying operation while maintaining measurement accuracy.
3Measurement precision
If focal position determination is performed in advance before additive manufacturing, then measurement accuracy is improved, but productivity decreases due to inability to perform real-time adjustment
Solution Approach 1:
The system continuously determines the actual focal position during the additive manufacturing process by analyzing radiation emitted from irradiation regions in the build material. This real-time feedback enables dynamic adjustment of process parameters to compensate for thermal shifts and maintain optimal focal position throughout manufacturing, rather than relying on pre-process calibration alone.
Solution Approach 2:
The focal position determination occurs continuously during the additive manufacturing process rather than as a separate pre-process step. The energy beam continuously generates irradiation regions that emit radiation for diagnosis while consolidating build material, allowing simultaneous manufacturing and monitoring without interrupting the production flow.
4Measurement precision
If separate determination procedures are implemented, then measurement precision is improved, but process complexity increases
Solution Approach 1:
The build material and energy beam system serve themselves for focal position determination. The energy beam irradiates the build material to create an irradiation region, and the radiation emitted from this region is detected to determine focal position. This self-service approach eliminates the need for separate determination procedures, external calibration objects, or additional measurement equipment.
Solution Approach 2:
The build material serves dual purposes as both the material to be consolidated and the determination means for focal position measurement. The irradiation region generated in the build material provides the radiation signal for diagnosis while the build material itself undergoes consolidation, eliminating the need for separate determination procedures and reducing overall process complexity.
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
Enables efficient and automated focal position determination during the additive manufacturing process, reducing time and effort by decoupling the focal position determination from the energy beam itself, and compensating for thermal shifts.
Implementation Method 1
determine a focal position of the energy beam and/or a difference between a reference focal position and an actual focal position of the energy beam based on radiation that is emitted from at least one irradiation region
Data Source
Figure 1
Figure 2
AI summary
Apparatus (1) for additively manufacturing three-dimensional objects (2) by means of successive layerwise selective irradiation and consolidation of layers of a build material (3) which can be consolidated by means of an energy beam (5), comprising an irradiation device (4) is adapted to generate the energy beam (5) and guide the energy beam (5) over a determination plane (6), in particular a build plane (17) in which the build material (3) is applied to be irradiated, wherein the irradiation device (4) is adapted to generate at least one irradiation region (8), in particular a melt pool, in the determination plane (6), wherein a determination device (10) is provided that is adapted to determine a focal position of the energy beam (5) and/or a difference between a reference focal position and an actual focal position of the energy beam (5) based on radiation (9) that is emitted from at least one irradiation region (8).