JPH0471724A - Method for correcting warpage of width of steel strip - Google Patents

Abstract

PURPOSE:To easily correct the warpage of width of the steel strip by setting the ultra-sonic type width warpage measuring device and the width-warpage correcting device on the advancing direction of the steel strip and adjusting the intermesh quantity based on the width warpage quantity and the set value of intermesh quantity if the measured width warpage quantity gets out of the allowable quantity. CONSTITUTION:The width warpage correcting device 4, the sheet thickness meter 5, the flaw inspecting machine 6, the centering pinch roll 7 and the ultra- sonic type width warpage measuring device 8 are arranged on the advancing direction of the steel strip. When the width warpage quantity measured with the measuring device 8 gets out of the prescribed allowable quantity, the intermesh quantity (m) of the rolls 41, 42, 43 is adjusted based on the pre-set width warpage quantity and the intermesh quantity of the rolls 41, 42, 43 of the width warpage correcting device 4. The intermesh quantity (m) is the overlapping quantity of the adjacent roll 41 and 42 or 42 and 43. And the width warpage quantity of the steel strip 3 is the quantity of the steel strip 3 curved along the width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for on-line correcting warpage in the width direction of a steel strip that has been repeatedly bent by a plurality of rolls.

(b) In a processing line where the conventional technology is subjected to repeated bending by a large number of rolls, warping occurs in the width direction of the steel strip. This amount of warpage is
It varies greatly depending on the thickness and yield point of the steel strip being processed.

In the conventional technology, changes in the amount of warpage are dealt with by adjusting the amount of intermesh of the straightening roll, but since the amount of width warp cannot be accurately grasped online, it is difficult to adjust the amount of intermesh. It was difficult and did not function as a warpage correction system.

As methods for suppressing width warping of steel strips, there are two known methods: using two or three straightening rolls, and using a tension leveler that combines a stretching roller and a shape correcting roller. Width warpage of the steel strip is corrected by adjusting the intermesh amount of the correction unit. However, in actual operation, it had the problems mentioned above.

(c) The problem to be solved by the invention is to obtain a method that can measure the width warpage of a steel strip and automatically correct the width warp online.

(2) Means for Solving the Problems The method for straightening warpage in the width direction of a steel strip of the present invention is a method for on-line straightening warpage in the width direction of a steel strip that has been repeatedly bent by a plurality of rolls. An ultrasonic width warp measuring device and a width warp correcting device are provided in the device, and when the amount of width warp measured by the measuring device deviates from a predetermined tolerance,
The above problem is solved by adjusting the intermesh amount of the roll based on the relationship between the preset width warp amount and the roll intermesh amount of the width warp correction device. .

(e) Function: In the method of the present invention, four ultrasonic displacement sensors are arranged in the width direction of the steel strip in order to measure the amount of width warpage online. In addition, the sensor at the center of the steel strip is fixed, and the sensor at the edge is movable to automatically control the amount of width warpage. Calculate the output values of the two sensors and compare them with the warp amount set value,
The amount of intermesh is manipulated according to the relationship between the amount of warpage and the amount of intermesh of the roll of the straightening device. This method enables online width warpage control.

Embodiment) An embodiment of the method for correcting width warpage of a steel strip according to the present invention will be described with reference to FIGS. 1 to 7.

The method for straightening warpage in the width direction of a steel strip according to the present invention is applied to a method for on-line straightening warpage in the width direction of a steel strip that has been repeatedly bent by a plurality of rolls. For example, FIG. 1 shows an example in which the method of the present invention is applied between a skin pass rolling mill 1 and a winder 12. In FIG. 1, with respect to the traveling direction of the steel strip 3, from the upstream side, a width warpage correction device 4, a plate thickness gauge 5, and a flaw inspection machine 6 are installed.
, a centering pinch roll 7, and an ultrasonic width warp measuring device 8 are arranged.

In the method of the present invention, when the amount of width curvature measured by the measuring device 8 deviates from a predetermined tolerance, a preset amount of width curvature and the rolls 41, 42, 43 of the width curvature correction device 4
Based on the relationship between the amount of intermeshing and
Adjust the intermesh amount m of 1,42,43.

As shown in FIG. 2, the width warpage correction device 4 includes, for example, three rolls 41, 42, and 43 arranged in a staggered manner, and the upper roll 42 in the center is moved by conventional means such as hydraulic pressure or a gear mechanism (a fourth
(see figure). The intermesh amount m refers to the amount of overlap between adjacent rolls 41 and 42 or 42 and 43, as shown in FIG.

Width warping of the steel strip 3 means that the steel strip 3 is curved along the width direction, as shown in FIG. If it is convex downward (A)
In the case of upward convexity, (B) indicates a minus (-) curvature.The width curvature measuring device 8 used in the method of the present invention is, for example, as shown in FIG. Type displacement sensors Sc, S, S2. Place S3 on one side in the board width direction 4
It is arranged in pieces. One sensor Sc is placed in the center of the plate, and three sensors S, , S2°S are placed on the work side. Sensors Se, Sl, S2゜S, respectively.
and the steel strip 3 1c, l5. Z2.73 is measured. When sensors Sc and S are selected depending on the width of the steel strip, the online width warping amount G of the steel strip
t is expressed by the following formula (■).

Gt = 1! c-ρ1・・・・・・■Same a! Even if sensor S2 or S3 is selected, sensor S
By taking the difference between the output value and c, the amount of online width warping of the steel strip 3 can be measured.

FIG. 6 shows an example in which the amount of width warpage was measured using this method. The horizontal axis represents the intermesh amount m of the roll of the width warpage correction device 40, and the vertical axis represents the amount of change in width warpage caused by the width warpage correction device 4. The width warping correction device 4 includes an upper roll 4
2 is movable, and the diameter of the upper roll 42 is 180 mm, 1
Measurements were carried out in two ways: 20n+m. By operating the upper roll 42, the amount of width warpage of the steel strip 3 changes, and
It can be seen that the amount of change can be measured by the width warp measuring device 8.

The dimensions of the steel strip to be measured shown in Figure 6 are plate thickness 0.7s.
+mX board width 1200m5+.

Sensors S, , S2 . shown in FIG. Although S3 is a fixed type in the board width direction, sensors s and S2 may be omitted and sensor S may be configured to be movable in the board width direction (see FIG. 4).

In FIG. 1, a width warp correction device 4 and a width warp measurement device 8 are shown.
and their positions may be interchanged.

Next, an example of the width warpage control system will be explained with reference to FIG. 4. This control system is made up of a width curvature correction device 4, a width curvature measuring device 8, and a control device 9.

The control device 9 is made up of a memory 91, a sequencer 92, a process computer 93, an APC 94, a PLG 95, a motor 96, and a setting device 97.

The memory 91 receives signals from the sensors Sc and Ss, and
It is stored as a width warp amount achievement and sent to the sequencer 92. The sequencer 92 includes manufacturing instruction information from the process computer 93, a table (FIG. 6) in which the relationship between the intermesh amount and the width warp change amount is determined in advance from the setting device 97;
Upon receiving the width warpage amount from the memory 91, an appropriate intermesh amount is determined and sent to the control device of the width warp correction device 4.

An APC (auto position controller) 94 adjusts the position of the sensor S3 in the width direction based on board width information from the process computer 93. PLO (pulse generator) 95 detects the rotation speed of motor 96,
Send to APC94.

The process computer 93 receives manufacturing instruction information from the higher-level computer and instructs the lower-level sequencer 92 to set values. Also, collect the results.

Table 1 and FIG. 7 show the results of applying the method of the present invention to a continuous annealing line.

Table 1 (g) Effects According to the present invention, it becomes easy to straighten the width warpage of a steel strip. Therefore, it is possible to obtain the effects of improved threadability and quality in a continuous line. Furthermore, the present invention is applicable to all processing lines that undergo repeated bending by multiple rolls.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example in which the method of the present invention is applied to a conventional adjustment rolling line. FIG. 2 is an explanatory diagram of the roll intermesh amount of the width warpage correction device. Fig. 3 is an explanatory diagram of the width warpage of the steel strip. FIG. 4 is a block diagram showing an example of a width warpage control system, FIG. 5 is an explanatory diagram of a width warpage measuring device, FIG. FIG. 7 is a chart showing the width warpage correction results of an example of the method of the present invention. 3: Steel strip 4: Width warp correction device 8; Width warp measuring device 9: Control device 41 42.43: Rolls Sc, Sl, S2. S): Sensor

Claims (1)

[Claims] In a method for online straightening the width direction warpage of a steel strip that has been repeatedly bent by a plurality of rolls, an ultrasonic width warp measuring device and a width warp straightening device are provided in the traveling direction of the steel strip, and the measuring device measures the warp. When the amount of width warpage deviates from a predetermined allowable amount, the intermesh amount of the roll is adjusted based on the relationship between the preset width warp amount and the intermesh amount of the roll of the width warp correction device. A method for straightening width warpage of steel strips.