Molten-Puddle Sensor Integration in Additive-Manufactured Metal Parts
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Solution Overview
Problem
Existing sensor integration methods in additive manufacturing are complex, costly, and prone to degradation during the printing process, leading to measurement errors and inefficiencies, particularly when integrating optical fibers for structural health monitoring.
Innovation Solution
A method involving additive printing to create a housing volume for the sensor, depositing the sensor, and forming a molten puddle around it to secure the sensor within the metal part, using techniques like laser fusion on a powder bed, ensuring minimal interference with the measurement environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sensor integration methods are used, then sensors can be protected from the operating environment, but the integration process becomes complex and costly with high insulation requiring thick protective coatings
Solution Approach 1:
The patent merges the sensor integration with the additive manufacturing process itself. The sensor is positioned within the molten metal pool during printing, and the surrounding material is deposited directly onto the sensor surface, combining protection and integration into a single process step rather than requiring separate protective coating operations.
Solution Approach 2:
The patent changes the physical state of the surrounding material from solid (requiring thick coatings) to molten during the integration process. By controlling the local melting point and using the molten state for direct deposition onto the sensor, the process achieves better adhesion and thinner effective protection without increasing complexity.
2Ease of manufacture
If known integration techniques are used, then sensors can be embedded in additive manufactured parts, but the stresses of printing strongly degrade the sensor and often lead to its destruction
Solution Approach 1:
The patent applies preliminary protective measures by positioning the sensor within a recess or channel in the substrate before the printing process begins. This pre-positioning allows the sensor to be protected from direct exposure to printing stresses from the outset, rather than attempting to protect it during the printing process itself.
Solution Approach 2:
The patent introduces an intermediary protective layer or channel structure between the sensor and the printing environment. This intermediary element (such as a protective channel or recess) acts as a buffer that shields the sensor from direct contact with harmful printing stresses while still allowing the sensor to be integrated into the final structure.
3Reliability
If thick protective coatings are applied to sensors, then sensors are protected from degradation, but measurement errors increase due to insulation from the measurement environment
Solution Approach 1:
The patent applies local quality by providing protection only where needed and maintaining sensor exposure where measurement is required. The protective structure (channel or recess) provides mechanical protection to the sensor body while leaving the sensor's measurement surface exposed to the environment, ensuring both protection and measurement accuracy without requiring thick coatings.
4Reliability
If conventional sensor integration is used, then sensors can be installed on parts, but production time is long (at least 24 h needed for nickel deposition)
Solution Approach 1:
The patent merges the sensor integration operation with the additive manufacturing process into a single simultaneous operation. The sensor is positioned and protected during the printing process itself, eliminating the need for separate post-processing coating operations that would otherwise require at least 24 hours, thereby dramatically reducing production time.
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
The method achieves robust and precise sensor integration with minimal degradation, allowing for accurate measurement of internal parameters such as temperature, stress, and radiation without the need for thick protective coatings, reducing production time and costs.
Implementation Method 1
the formation of a molten puddle in the housing volume, on either side of the metal tube of the sensor
Implementation Method 2
formation of a molten puddle in the housing volume
Implementation Method 3
The metal of the molten puddle allows, by cooling, to fasten the sensor to the walls of the housing volume
Data Source
AI summary
A method for integrating a sensor into a metal part including creating, by additive printing, of a first portion of the part, including a volume for housing a sensor. The volume has a width greater than that of the sensor. The method also includes depositing the sensor in said housing volume and creating, by additive printing, a second portion of the part covering the sensor and forming a molten puddle in the housing volume, on either side of the sensor.