Optical Pyrometer Calibration for Electron Beam Powder Temperature Control
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Solution Overview
Problem
In additive manufacturing, especially electron beam additive manufacturing, accurately measuring and maintaining the temperature of powder layers is challenging due to high heat levels and inaccuracies in thermal sensors, leading to potential waste and inefficiencies.
Innovation Solution
A calibration system that includes an optical pyrometer and an analysis component to capture thermal radiation from raw material, determining calibration parameters based on the predetermined phase transition temperature, allowing for precise adjustment of the pyrometer and electron beam guns to ensure accurate temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal sensors are used to measure temperature in electron beam additive manufacturing, then temperature measurement is enabled, but measurement precision deteriorates due to sensor inaccuracies and drift at high heat levels
Solution Approach 1:
The patent introduces an optical pyrometer as an intermediary measurement device that captures thermal radiation from the powder layer through a window, avoiding direct contact with the high-temperature environment. This mediator enables accurate temperature measurement without the reliability issues of contact thermal sensors operating at extreme temperatures
Solution Approach 2:
The patent replaces the mechanical/physical contact-based thermal sensor system with an optical measurement system. The optical pyrometer measures temperature remotely by detecting thermal radiation, eliminating the mechanical contact and associated drift problems of traditional thermal sensors in high-heat environments
2Manufacturing precision
If temperature measurement accuracy is improved using optical pyrometer, then manufacturing precision improves, but device complexity increases due to additional calibration systems
Solution Approach 1:
The calibration system uses the material's own phase transition characteristics (melting and solidification at known temperatures) as self-reference points. The system automatically calibrates the optical pyrometer by detecting these inherent material properties, eliminating the need for external calibration standards or complex manual calibration procedures
Solution Approach 2:
The patent exploits the phase transition temperatures of the powder material (melting point and solidification point) as natural calibration references. By monitoring thermal radiation during these phase changes, the system automatically determines calibration parameters without requiring additional complex calibration equipment
3Measurement precision
If calibration is performed using phase transition temperature, then measurement precision improves, but loss of time increases due to calibration process duration
Solution Approach 1:
The system performs calibration measurements during the natural heating and cooling cycles that occur during normal additive manufacturing operations. By utilizing the inherent thermal cycles of the process, calibration is accomplished as a preliminary or concurrent action rather than a separate time-consuming step
Solution Approach 2:
The calibration process is integrated into the continuous manufacturing cycle, using thermal radiation measurements taken during normal heating and cooling phases. This allows calibration to occur continuously or periodically without interrupting the useful manufacturing action, maximizing equipment utilization
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 system enables quicker and more accurate formation of articles by reducing temperature measurement errors, identifying contamination, and minimizing waste by maintaining consistent heating temperatures and energy deposition.
Implementation Method 1
an optical pyrometer positioned to capture thermal radiation emitted from raw material disposed on a surface within a build chamber
Implementation Method 2
at least one electron beam gun configured to emit an electron beam within the build chamber
Implementation Method 3
utilize electron emitters to melt a powder layer
Implementation Method 4
until the first target area solidifies at a predetermined phase transition temperature associated with the raw material
Implementation Method 5
the first melt puddle transitions from a liquid to a solid
Data Source
AI summary
Devices, systems, and methods for calibrating for an electron beam additive manufacturing system. The electron beam manufacturing system includes electron beam guns. A calibration system includes an optical pyrometer. The optical pyrometer captures thermal radiation emitted from raw material. An analysis component is communicatively coupled to the optical pyrometer. The analysis component is programmed to determine calibration parameters from information from the optical pyrometer and a phase transition temperature.