Additive Manufacturing Cooling Rate Feedback for Melt Pool Control
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Solution Overview
Problem
Existing additive manufacturing technologies lack the ability to reliably and consistently control the cooling rate of materials during the construction process, which affects the material properties of the finished parts.
Innovation Solution
An additive manufacturing system equipped with sensors to monitor and control the cooling rate by detecting thermal energy density and emitting a beam of energy, adjusting power levels based on detected cooling rates, and using emissivity sensors to determine material properties, thereby controlling the microstructure and material properties of the parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling rate is not controlled, then the additive manufacturing process is simpler, but the material properties and reliability of the finished parts deteriorate
Solution Approach 1:
The system employs a sensor to detect the temperature of the work region and a processor to determine the cooling rate, then uses this information to adjust the power source parameters in real-time, creating a closed-loop feedback control system that maintains reliable material properties without requiring complex external intervention
Solution Approach 2:
The system uses the thermal radiation emitted by the work region itself as the sensing mechanism, where the same physical phenomenon (thermal emission) that occurs during manufacturing is harnessed for measurement and control, eliminating the need for separate complex measurement systems
2Manufacturing precision
If sensors and control systems are added to monitor cooling rate, then material properties control improves, but device complexity increases
Solution Approach 1:
The sensor system serves multiple functions: it detects temperature, determines cooling rate, provides feedback for control, and monitors material properties all through a single integrated sensing and processing architecture, reducing overall system complexity while achieving precise manufacturing control
Solution Approach 2:
The system controls material properties by dynamically adjusting process parameters (power source power level, beam speed, hatch spacing) based on real-time cooling rate measurements, enabling precise manufacturing control through parameter optimization rather than complex mechanical interventions
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 precise control over the material properties of finished parts, allowing for quality control and the production of parts with varying properties across different regions, enhancing the reliability and consistency of additive manufacturing.
Implementation Method 1
a sensor configured to sense a temperature of the work region
Implementation Method 2
the sensor comprises a first emissivity sensor configured to detect a first range of wavelengths and a second emissivity detector configured to detect a second range of wavelengths
Implementation Method 3
a power source configured to emit a beam of energy that impinges a work region of a build plane
Implementation Method 4
the beam of energy creates a transient melt pool of the metallic powder
Implementation Method 5
determine a cooling rate of the work region after the power source has been terminated
Data Source
AI summary
An additive manufacturing system includes a work region having a layer of metallic powder distributed across at least a portion of the work region. The system further includes a power source, a scanning and focusing system and a processor. The processor is configured to control the power source to emit a beam of energy at a power level and to manipulate the beam of energy across the work region in a plurality of build tracks to form a part from the fused metallic powder. The processor further determines a cooling rate at a termination of each of the plurality of build tracks and controls the power level of the power source in response to the determined cooling rate.