Rapid identification and monitoring method for hot continuous rolling strip steel camber defect

Abstract

The invention discloses a rapid identification and monitoring method for a hot continuous rolling strip steel camber defect. According to the method, a strip steel runs on a laminar cooling region roller way in a free state before entering a recoiling machine and after leaving the finish rolling machine, a width measuring instrument is used for measuring deviation data of the center line of the strip steel and the center line of a roller way; the width measuring instrument is used for outputting the measuring data to a computer, the computer calculates the deviation data of the center line ofthe strip steel and the center line of the roller way according to the measuring data of the width measuring instrument, and a deviation curve of a deviation value and the length relation is manufactured; if a platform type deviation with the length of 10-50 meters is generated in the deviation curve, moreover, an absolute value of the deviation data between the center line of the deviation curveand the center line of the roller way is in the range A, the strip steel is judged to be an L-shaped camber; if the maximum value in a difference value between the adjacent wave crest and the wave trough on the deviation curve is within the range B, the strip steel is judged to be an S-shaped camber; the value of B is larger than the value of A; and after the strip steel is judged to be the camber, a computer system outputs an alarm, moreover, a steel coil exceeding the standard is automatically blocked, and the length exceeding the standard is recorded.

Description

technical field [0001] The invention relates to a method for identifying sickle-like bending of hot continuous rolling strip steel after rolling, in particular to a rapid identification and monitoring method for sickle bending defects of hot continuous rolling strip steel. Background technique [0002] The hot rolling process generally includes heating, rough rolling, finishing rolling, coiling and other processes, refer to figure 1 . Firstly, according to the rolling plan, the slabs are loaded into the walking heating furnace 1 in sequence. After the slabs are heated to the target temperature specified by the process, they are transported to the rough rolling unit 2. The rough rolling unit takes the 200-250mm slabs After being rolled into a 38-60mm intermediate billet, it is transported to the finish rolling unit by a roller table with a heat preservation cover 3. The intermediate billet first passes through the four-link flying shear 4 to cut off the irregular parts of i...

AI Technical Summary

Problems solved by technology

The camber defect is extremely harmful. It will not only lead to the instability of the rolling process of the unit, but also affect the stability of the subsequent laminar cooling and strip coiling process. There are many problems such as edge blocking, and serious accidents such as deviation of the hot-rolled strip and damage to the centering device of the cold-rolling, or even deviation and breaking of the strip during cold-rolling

[0004] At present, the on-line monitoring of the sickle bend of the strip in hot rolling is mainly through visual observation of the shape of the F7 export strip. Curved visual monitoring is nearly ineffective

If it is necessary to accurately grasp the camber of the strip steel, it can only be measured by manual wire drawing after the strip steel is cooled and the strip steel is reopened by the finishing unit. Usually, it takes three months from the end of strip steel production to cooling to normal temperature. Days or so, so the timeliness of monitoring the sickle curve is extremely poor

Since the camber of the strip cannot be obtained quickly and accurately, the online control of the camber cannot be realized

[0005] The current strip sickle detection method has the following disadvantages: 1. Poor accuracy: Due to factors such as the fast running speed of the hot-rolled strip and the long visual observation distance (about 20m), it is impossible to accurately obtain the real sickle of the strip

2. Poor timeliness: manual measurement is required to obtain accurate camber conditions, which takes at least three days, and the timeliness is too poor for camber control

3. Small coverage: Since the sickle bend of strip steel needs manual measurement, only a small number of steel coils can be selected for random inspection, and the coverage length is short, so it is impossible to achieve full coverage of steel coils

4. Low efficiency and high work intensity: Manual measurement is required section by section on the finishing line, with heavy workload and low efficiency

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