Cold Spray Additive Manufacturing Path Optimization
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Solution Overview
Problem
Cold spray additive manufacturing faces challenges in mitigating geometric defects and material defects in the resulting parts, primarily due to variations in the path of movement of the nozzle, which can result in unintended impact angles affecting material quality and deposit shape.
Innovation Solution
A method involving the generation of models to predict geometric and material defects based on impact angles, followed by modification of the nozzle path to minimize errors between predicted and desired deposit geometries, thereby reducing the probability of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the nozzle follows a standard path during cold spray deposition, then the deposition process is simple and fast, but geometric defects and material defects occur due to unintended impact angle variations
Solution Approach 1:
The system performs preliminary actions by generating a defect prediction model before deposition and modifying the nozzle path in advance to prevent defects. The method creates a model of geometric profile and material defects as a function of impact angle, then uses this model to predict and mitigate defects before they occur during actual deposition.
Solution Approach 2:
The system implements feedback by using the generated defect prediction model to continuously evaluate the nozzle path and modify it iteratively. The model predicts bulk deposit geometry and material defect distribution based on the proposed path, and the path is modified to reduce errors between predicted and desired geometries.
2Manufacturing precision
If the nozzle path is modified to reduce geometric defects, then manufacturing precision improves, but the deposition process becomes more complex and time-consuming
Solution Approach 1:
The system performs preliminary path modification before actual deposition by generating a defect prediction model and using it to optimize the nozzle path in advance. This preliminary action prevents defects during deposition, avoiding the need for time-consuming post-processing or re-deposition.
Solution Approach 2:
The system replaces complex iterative mechanical trial-and-error path adjustments with a computational model-based approach. The defect prediction model and automated path modification algorithm substitute for manual path optimization, reducing time loss while maintaining precision.
3Productivity
If high deposition rates are used, then productivity increases, but material defects increase due to impact angle variations
Solution Approach 1:
The system performs preliminary path optimization using the defect prediction model before high-rate deposition begins. By pre-modifying the nozzle path to account for impact angle variations, the system enables high deposition rates without sacrificing material quality, as defects are prevented in advance.
Solution Approach 2:
The system creates a digital model (copy) of the deposit geometry and defect distribution based on the proposed nozzle path. This virtual copy allows evaluation and optimization of the deposition process before actual material deposition, enabling high productivity with maintained reliability.
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 approach enables the production of components with improved geometric accuracy and reduced material defects, enhancing the overall quality and integrity of the deposited material.
Implementation Method 1
powdered materials are accelerated through a nozzle using a non-combustible gas to accelerate the particles to velocities sufficient to cause plastic deformation and bonding
Implementation Method 2
accelerate the particles to velocities sufficient to cause plastic deformation and bonding between the accelerated particles and an application surface impacted by the particles
Implementation Method 3
The gases employed for the deposition process may also be heated in order to change the gas dynamics effects through the nozzle, but also to increase the temperature of the powder particles on impact
Data Source
AI summary
A method of additive manufacturing using cold spray deposition of particles of a material to a supporting surface for deposited material. The method may include providing a cold spray deposition apparatus having a nozzle with a central axis forming an impact angle with the supporting surface and providing an additive material for application to the supporting surface using a cold spray deposition technique. The method may include analyzing characteristics of deposited cold spray material which may include forming a single line of deposited cold spray material on the supporting surface and generating a model of the deposited cold spray material. The method may include selecting a proposed path of movement of the nozzle, predicting results of using the proposed path using the generated model, and modifying the proposed path of movement of the nozzle to reduce error resulting from the proposed path.