Method for detecting solid-liquid phase fractions of continuous casting blanks in secondary cooling zone on line
A technology of solid-liquid phase and continuous casting slab, which is applied in the field of online detection of solid-liquid phase fraction of slab in the secondary cooling zone of continuous casting. and other problems, to achieve the effect of convenient maintenance, low investment cost and short transformation period
Inactive Publication Date: 2013-10-30
DALIAN UNIV OF TECH
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This method can roughly determine the position of the solidification end of the slab, but it cannot detect the solid phase and liquid phase fraction of the continuous casting slab, and has limited guidance for the soft reduction process
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[0033] figure 1 It is a schematic diagram of the online detection system for the solid-liquid phase fraction in the secondary cooling zone of the continuous casting slab. The molten steel flows from the ladle 1 into the tundish 2, and then distributes the molten steel in the tundish 2 to the mold 3 of the continuous casting machine according to the requirements of the casting process. The molten steel continuously passes through the water-cooled crystallizer, and the outer layer of molten steel is solidified into a solid billet shell, which is pulled out from the bottom of the crystallizer, and enters the secondary cooling zone through the foot roll section 4a of the 0 sector. In the secondary cooling zone, the surface of the slab with the liquid core is forcibly cooled, and the solidification process of the slab is accelerated by the spraying of cooling water. The fan-shaped section of the secondary cooling zone is composed of an arc section, a straightening section and a hor...
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A method for detecting solid-liquid phase fractions of continuous casting blanks in a secondary cooling zone on line belongs to the technical field of metallurgical continuous casting detection and includes the steps: firstly, mounting a device for detecting the solid-liquid phase fractions of the continuous casting blanks in the secondary cooling zone, modifying an original segment, and changing a switching valve of a hydraulic cylinder into a servo valve to realize low-frequency low-amplitude vibration of a driving roller; secondly, applying low-frequency low-amplitude periodic forced vibration to surfaces of the casting blanks by the aid of the driving roller during production; thirdly, detecting feedback pressure and displacement signals in real time by the aid of a sensor, and transmitting the signals to a model analysis system by the aid of a data acquisition system; and fourthly, calculating the solid-liquid phase fractions of the continuous casting blanks. The detecting method has the advantages that detecting precision of the solid-liquid phase fractions of the casting blanks can be further improved by means of online direct measurement, equipment modification period is short, invested cost is low, later maintenance is convenient, and the solid-liquid phase fractions of the casting blanks at different positions can be more precisely detected during practical production.
Description
technical field [0001] The invention relates to an online detection method for the solid-liquid phase fraction of a slab in a continuous casting secondary cooling zone, belonging to the technical field of metallurgical continuous casting detection. Background technique [0002] With the continuous development of modern industrial technology, the quality requirements for steel products are becoming increasingly stringent. In continuous casting production, there are generally defects such as center segregation, center looseness and internal cracks inside the slab, which have a negative impact on the quality of the slab. At present, the common method to improve the internal quality of continuous casting slab is soft reduction technology. This technology applies a certain pressure near the solidification end of the slab to implement a suitable reduction amount to prevent the intergranular enrichment of solute elements. The molten steel flows laterally toward the center of the s...
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IPC IPC(8): B22D11/16
Inventor 姚曼王旭东王兆峰
Owner DALIAN UNIV OF TECH