EMAT Phased Array Probe for Continuous Casting Surface Defect Detection
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Solution Overview
Problem
Current continuous casting methods face challenges in real-time adaptation of process parameters to ensure high-quality metallurgical cast products due to limitations in surface defect detection, particularly low lateral resolution in optical methods and the need for mechanical movement in eddy current methods.
Innovation Solution
A continuous casting device equipped with an EMAT sensor designed as a phased array for non-contact ultrasonic testing, allowing for real-time detection and evaluation of surface defects, which adjusts process parameters like casting speed and cooling based on ultrasonic signal data, eliminating the need for mechanical movement and providing detailed defect analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical methods (CCD cameras) are used for surface quality checking, then real-time detection is achieved, but lateral resolution is low
Solution Approach 1:
The patent replaces optical detection methods with electromagnetic acoustic transducer (EMAT) technology, which uses electromagnetic fields to generate and detect acoustic waves in the metallurgical cast product. This substitution enables high-resolution defect detection without the lateral resolution limitations of optical systems, while maintaining real-time detection capability through non-contact measurement
Solution Approach 2:
The patent changes the detection parameter from optical reflection to acoustic wave propagation. By using EMAT sensors that generate ultrasonic waves and detect acoustic responses, the system achieves superior measurement precision for surface and near-surface defects compared to optical methods, while the automated scanning process maintains real-time detection speed
2Measurement precision
If eddy current transducer is used for surface defect detection, then surface quality inspection is achieved, but the inspection device must be moved over the cast product
Solution Approach 1:
The patent replaces the mechanically moved eddy current transducer with a stationary EMAT sensor system. The EMAT sensors are fixed in position and use electromagnetic fields to inspect the cast product as it passes by, eliminating the need for mechanical movement while maintaining high detection precision for surface and near-surface defects
Solution Approach 2:
The EMAT sensor system performs multiple functions: it can detect surface defects, near-surface defects, and internal defects with a single stationary device. This multi-functional capability replaces the need for separate inspection devices and mechanical movement, simplifying the overall system while enhancing detection comprehensiveness
3Adaptability or versatility
If real-time detection and control is implemented, then process parameter adaptation is improved, but detection accuracy must be sufficient to guide control decisions
Solution Approach 1:
The patent employs EMAT technology that uses electromagnetic acoustic transduction to achieve high-precision defect detection. The electromagnetic fields generated by the EMAT sensors interact with the metallurgical cast product to produce acoustic waves that reflect off defects, providing accurate real-time data for process control adaptation
Solution Approach 2:
The system implements real-time feedback control by continuously monitoring defect detection results and automatically adjusting process parameters such as casting speed and cooling rate. The high measurement precision of the EMAT sensors ensures that the feedback signals are accurate enough to guide control decisions and improve product quality
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 solution enables more effective detection and correction of surface defects, reducing rejects and improving product quality by allowing for real-time adjustment of process parameters without mechanical complexity, ensuring consistent testing quality across varying temperatures.
Implementation Method 1
A detection device for detecting surface defects and/or defects close to the surface in the metallurgical cast products in the production line; the detection device is at least one EMAT (electromagnetic acoustic transducer) sensor designed as a phased array
Implementation Method 2
the EMAT sensor is designed to receive ultrasonic signals which result from reflections of the ultrasonic wave front on the metallurgical cast products
Data Source
Figure 1~2
AI summary
The invention relates to a continuous casting device (1) and a continuous casting method for producing and/or inspecting cast metallurgical products (3). The continuous casting device (1) comprises a detecting device (5) for detecting surface defects and/or defects near the surface of the cast metallurgical products (3) in the production line. The detecting device (5) is at least one EMAT sensor (50) designed as an array-type probe.