Online detection system for solid-phase internal boundaries and solidification end positions of continuous casting blanks and method

Abstract

The invention discloses an online detection system for internal boundaries and solidification end positions of continuous casting blanks and a method. The system comprises a signal generator, electromagnetic ultrasonic sensors, a signal processor, a computer and a controller, wherein the electromagnetic ultrasonic sensors are arranged in dynamically slightly stressed regions in a casting direction of a continuous casting blank and set positions of various fan-shaped sections of local zones of the upstream and the downstream which are adjacent to the regions, and the end area of the end, which faces to the surface of the detected continuous casting blank, of a magnet in each electromagnetic ultrasonic sensor is larger than the end surface of the end, which is far away from the surface of the continuous casting blank, of the magnet in the electromagnetic ultrasonic sensor. In the system, the end area of the end, which faces to the surface of the detected continuous casting blank, of the magnet in each electromagnetic ultrasonic sensor is larger than the end surface of the end, which is far away from the surface of the detected continuous casting blank, of the magnet in the electromagnetic ultrasonic sensor, and accordingly, the signal to noise ratio of electromagnetic ultrasonic waves can be improved. In addition, electromagnetic ultrasonic signals are processed by the computer in screening, shifting, adding and averaging modes, so that the signal to noise ratio of the electromagnetic ultrasonic waves can be greatly increased.

Description

technical field [0001] The invention relates to the field of steelmaking and continuous casting, in particular to a system and method for online detection of the solid phase inner boundary and solidification end position of continuous casting slabs. Background technique [0002] In the continuous casting production process, in order to reduce the center segregation of the continuous casting slab and eliminate defects such as center porosity and cracks, the light reduction technology is usually used, that is, the continuous casting slab at the end of solidification is slightly reduced on the basis of the shrinkage of the roll gap. Prevent the formation of shrinkage voids inside the continuous casting slab, compensate for the shrinkage in the final solidification stage, and improve the internal quality of the slab, such as improving the ductility, welding performance, and crack resistance of steel. [0003] Accurately detecting the inner boundary of the solid phase of the cont...

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Problems solved by technology

[0016] The present invention aims to provide a system and method for online detection of the solid phase inner boundary and solidification end position of continuous casting slabs to solve the problems of time-consuming and labor-intensive online detection of continuous casting slab solid phase inner boundaries and solidification end positions that cannot be realized by traditional methods. There is a technical problem that the signal-to-noise ratio S / N of the electromagnetic ultrasonic method is too small

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