Beam Scanner Calibration via Powder Imaging in Additive Manufacturing
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Solution Overview
Problem
Existing methods for calibrating energy beams in additive manufacturing devices are inefficient, material-wasting, and dependent on specific powder properties, making them unsuitable for high productivity and precise alignment.
Innovation Solution
A method involving imaging and comparative analysis of energy beam scans below the powder modification threshold to calibrate beam scanners without altering the powder, using radiation pressure to shift grain positions and compare image changes to determine scan paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical and/or chemical transformations of the powder material are used for calibration, then calibration can be carried out inside the working area, but productivity deteriorates and material is wasted
Solution Approach 1:
The patent uses optical copies (images) of the powder material surface instead of physically transforming the material itself. By capturing images before and after beam scanning, the system creates a visual record of grain position changes without altering the powder's physical or chemical properties, thus avoiding material waste and maintaining productivity while achieving calibration accuracy.
Solution Approach 2:
The patent replaces physical/chemical transformation methods with an optical detection system. Instead of modifying the powder material through energy beam transformation, the system uses cameras to detect scattered light from the powder surface, substituting mechanical/chemical calibration approaches with optical measurement to achieve the same calibration goal without material degradation.
2Loss of substance
If detection of scattered emission is used for calibration, then calibration can be performed without material transformation, but the method strongly depends on powder material properties and requires dedicated optical sensors
Solution Approach 1:
The patent employs standard optical cameras that can detect scattered emission from the powder material surface. These universal optical sensors can be used with different powder materials without requiring dedicated sensors for each material type, as the detection principle relies on general light scattering properties that are common to most powders, thereby reducing device complexity while avoiding material transformation.
3Measurement precision
If detectors or sensors are placed directly in the working area for energy beam detection, then beam detection is possible, but the process becomes cumbersome and consumes valuable process time
Solution Approach 1:
The patent performs calibration measurements during idle periods or between manufacturing steps by capturing images of the powder surface before and after beam scanning. This preliminary action allows the system to calibrate beam scanners without interrupting the main manufacturing process, as the calibration images are taken during setup or transition phases, thereby maintaining productivity while achieving accurate beam detection.
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 fast, high-productivity calibration that maintains powder integrity, reduces material waste, and achieves precise beam alignment without chemical or physical transformation of the powder.
Implementation Method 1
The energy beam is scanned along a predetermined scan path in the detection region... using radiation pressure to shift grain positions
Data Source
AI summary
A method for calibrating at least one beam scanner in a manufacturing device for additively manufacturing an object from a powder material includes taking a first image of a detection region covered with the powder material in the manufacturing device, and controlling the at least one beam scanner to scan at least one energy beam along a predetermined scan path in the detection region. A first power density of the at least one energy beam is chosen below a modification threshold of the powder material. The method further includes taking a second image of the detection region, comparing the first image and the second image and obtaining a comparative result, and calibrating the at least one beam scanner based on the comparative result.