Bonded bleed-out judging and alarming method

Abstract

The invention provides a bonded bleed-out judging and alarming method. When a temperature monitoring screen of a crystallizer displays that an appeared temperature curve takes one thermocouple as a center or a starting point, the temperature curves of the thermocouples on both sides (one side) are similar to those of an alarm thermocouple, but the response time of the temperature curves of the thermocouples is changed in the manner of successive lagging, and when the temperature monitoring screen of the crystallizer displays that all the rows of the temperature curves are intersected, i.e. the bonded bleed-out is judged, and an alarm is given. At the same time, a continuous casting machine sharply slows down and enters a creep state, carries out a shell removing treatment on an internal blank shell of the crystallizer, and then accelerates the pulling rate slowly to a setting pulling rate. According to the invention, the alarm accuracy of the bonded bleed-out is improved greatly, and the alarm times and the rapid speed-down times of a casting machine are reduced, so that the problems of deepened vibration marks on the surface of a casting blank and reduction in the constant speed rate of a continuous casting machine due to the rapid speed-down of the casting machine are solved. Therefore, the productivity of the continuous casting machine and the internal quality of the casting blank are improved, the blanks with lapping defects and the quantity of waste products are reduced, and the yield of continuous blank casting is improved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting technology, and in particular relates to a method for judging whether a bonded breakout is to be alarmed and processed by using a temperature detection curve. Background technique [0002] The bonded breakouts in the continuous casting and drawing process all occur between the slab shell and the copper plate on the inner wall of the crystallizer, which is a frequent form of breakouts. Therefore, bonded steel breakout alarm device also arises at the historic moment. That is, the temperature change of the inner wall of the mold is monitored by two or three rows of thermocouples installed on the outer wall of the crystallizer, and whether a bonding breakout occurs is determined by the unique change trend of the temperature curve. There are three main types of temperature curves: [0003] 1. The temperature curve detected by the upper row of thermocouples rises and then falls, and the tem...

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Problems solved by technology

[0007] Once the bonded breakout alarm device alarms, the continuous casting machine will automatically slow down and enter the crawling state, and the casting speed will drop to 0.1m / min instantly, which will not only lead to the deepening of the vibration marks on the surface of the slab, but also the decline of the internal quality of the slab, and the constant speed of the continuous casting machine Reduced, but also will produce contact blanks, resulting in increased waste

[0008] However, through a large number of production practices, it is found that there are a large number of false alarms in the entire alarm process, that is, there is no bonding breakout phenomenon in the drawing process

Due to the existence of a large number of false alarms, the number of low-quality slabs has increased, the internal quality of slabs has declined, the constant rate of continuous casting machines has decreased, and the amount of scrap has increased.

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