DED Focused Power Control for Energy Runaway Interruption
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Solution Overview
Problem
The additive manufacturing process of titanium parts using Directed Energy Deposition (DED) faces challenges with uncontrolled energy surges, known as 'flash,' which lead to destruction of the titanium bead and surrounding structure, making it difficult to implement in serial part manufacturing due to high energy levels per unit area and random energy runaway phenomena.
Innovation Solution
Implementing a method where the manufacturing process is momentarily shut down when the intensity of the control current exceeds a given threshold, and resumed when it falls below this threshold, with simultaneous deactivation of the focused energy source and material supply system to prevent energy runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high energy levels per unit area are used for material deposition, then deposition speed and productivity are improved, but energy runaway phenomenon occurs causing destruction of the titanium bead and surrounding structure
Solution Approach 1:
The patent implements a feedback control mechanism by continuously monitoring the control current intensity of the focused energy source and automatically adjusting the deposition process. When the control current exceeds a predetermined threshold, the system temporarily suspends the deposition process, preventing energy runaway while maintaining high productivity during normal operation. This closed-loop control ensures safe operating conditions are maintained without significantly reducing overall deposition speed.
2Productivity
If continuous deposition process is maintained to ensure manufacturing continuity, then productivity is improved, but random energy runaway phenomena cannot be controlled
Solution Approach 1:
The system continuously monitors control current intensity and provides real-time feedback to the control mechanism. When energy levels approach dangerous thresholds, the feedback loop automatically triggers process suspension, preventing energy runaway while minimizing interruption to manufacturing continuity. The process can quickly resume after threshold conditions clear, maintaining overall productivity while ensuring reliability through automated safety control.
3Productivity
If control current intensity is increased to improve deposition efficiency, then productivity is improved, but the risk of energy runaway increases
Solution Approach 1:
The patent dynamically adjusts the control current intensity parameter based on real-time monitoring conditions. During normal deposition, high current levels are maintained for efficient material deposition. When the control current approaches predetermined threshold values, the system automatically reduces or suspends the current to prevent energy runaway. This dynamic parameter adjustment allows the system to operate at high efficiency when safe, while automatically reducing risk when conditions deteriorate.
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 significantly reduces the risk of energy runaway, allowing for controlled deposition of material layers and maintaining the expected characteristics of the titanium parts, ensuring the energy level per unit area remains within a safe range.
Implementation Method 1
melting a material using a focused energy source, such as a laser beam
Implementation Method 2
an electron beam for example
Implementation Method 3
a control device configured to control an operating parameter of the focused energy source and to interrupt the manufacturing process when the intensity of the control current exceeds a predetermined threshold value
Data Source
Figure 1~4
AI summary
The invention relates to a method for manufacturing a part (14) by stacking layers of material (16), each obtained by continuously depositing and fusing a material (18) using an energy beam (22), at least one characteristic of which is controlled by the intensity of a control current. The manufacturing process comprises a step of monitoring the intensity of the control current, a step of comparing the monitored control current intensity with a given threshold, and a step of stopping the manufacturing process when the control current intensity exceeds the given threshold. This temporary stoppage of the process significantly reduces the risk of energy runaway that could destroy the deposited material bead and the surrounding structure.