Acoustic Emission Feedback Control for Wire Arc Additive Defects
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Solution Overview
Problem
Wire arc additive manufacturing faces challenges with defects such as cracks and holes due to large heat input and accumulation, leading to reduced part service life. Existing on-line monitoring methods, including acoustic emission, primarily focus on defect identification rather than real-time quality control and remediation.
Innovation Solution
A closed-loop system comprising a wire arc additive system, an acoustic emission acquisition and identification system, and a feedback control system using a PID circuit. This system monitors the additive process, analyzes defects, and adjusts process parameters in real-time to improve part quality or initiate shutdown for large defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic emission sensor is tightly attached to surface to acquire clearest signals, then measurement precision is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent introduces a coupling agent as an intermediary substance between the acoustic emission sensor and the workpiece surface. This coupling agent improves acoustic signal transmission quality while simplifying the attachment process, resolving the contradiction between measurement precision and device complexity by providing an effective medium that facilitates both goals.
2Manufacturing precision
If on-line monitoring is implemented to identify defects, then manufacturing precision is improved, but loss of time increases due to data processing requirements
Solution Approach 1:
The patent implements a real-time feedback control system where acoustic emission monitoring data is immediately processed and fed back to adjust welding parameters. This closed-loop feedback mechanism enables continuous quality improvement without significant time loss, as the system automatically responds to detected defects by adjusting process parameters in real-time rather than requiring extensive post-processing analysis.
Solution Approach 2:
The system performs automated real-time data processing and defect analysis without requiring extensive external intervention. The monitoring system serves itself by automatically detecting defects, analyzing the data, and triggering appropriate responses, thereby reducing the time loss associated with manual data processing and enabling continuous manufacturing precision improvement.
3Manufacturing precision
If feedback control system adjusts parameters in real-time, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent employs a feedback control system that automatically adjusts welding parameters based on real-time acoustic emission monitoring. This feedback mechanism improves manufacturing precision by continuously optimizing process parameters, while the automated nature of the control reduces the need for complex manual intervention systems.
Solution Approach 2:
The patent replaces complex mechanical adjustment systems with an automated electronic feedback control system. Instead of manual parameter adjustments or complex mechanical control mechanisms, the system uses electronic sensors and controllers to automatically regulate welding parameters, thereby improving precision while managing device complexity through automation rather than mechanical complexity.
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 system effectively reduces defects in wire arc additive manufacturing by enabling real-time feedback and parameter adjustments, thereby improving part quality and preventing material waste from large defects.
Implementation Method 1
Acoustic emission refers to the phenomenon that when a material is deformed or broken under an external or internal force, stress concentration is occurred in local areas of the material, energy is released rapidly, and transient elastic waves are produced
Data Source
AI summary
A device for controlling quality of wire arc additive forming through feedback of acoustic emission comprises a wire arc additive system, an acoustic emission acquisition and identification system, and a feedback control system. The wire arc additive system is configured for forming solid parts by a wire arc additive process. The acoustic emission acquisition and identification system is configured for monitoring the wire arc additive process online and analyzing types and sizes of any resulting defects. The feedback control system is configured for analyzing monitored results and providing timely feedback to the wire arc additive system via a PID circuit. When the resulting defects are small, the types and sizes of defects are analyzed, and an instruction of correcting process parameters is sent to the wire arc additive system. When the resulting defects are too large to be remedied, a shutdown instruction is sent to the wire arc additive system.