JPS61226213A - Trimming method of strip steel - Google Patents

Abstract

PURPOSE:To perform a tension-out type, stable and high-precision trimming work by utilizing a strip-steel meandering-correction device, a strip-steel side- guide device and a position controller, in the strip-steel trimmer of an acid cleaning line. CONSTITUTION:Couples of light emitters a, b and light-intensity sensors 20, 20, positoined so as to face each other near a steering roller 121, detect any offset of strip steel in the left-right direction through an area shielded by the strip-steel edge, the the offset thus obtained is processed by an arithmetic unit 30, and input to a steering-roller tilting mechanism 40, the rollers are tilted in the left or the right by a required amount of angle, and the strip steel is returned to the central position. Vertical rollers r, rotatably positioned at the guiding parts 141, 141 of a strip steel side-guide device 14, and set widths among which are adjusted corresponding to the width of the passing strip, guide the band, in contact with the strip steel edge. With this constitution, a load exerted on the trimmer is markedly reduced, tension-cut type high precision and stable trimming work is performed without using a looping pit, thereby installation cost is reduced, and energy saving effect is also resulted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a steel strip trimming method for trimming a steel strip after pickling treatment in a steel strip pickling line using a tension cut method.

[Prior art]

In the steel strip pickling line, as shown in Figure 6, the steel strip (
s) is pickled in the pickling tank (L, 1.1...), then washed in the cold water tank (2) and hot water tank (3), and dried in the dryer (4). , a loop car (5), a priddle roll (6), a deflation crawl (7), a looping pit (8) and a pinch roll (9) in order, and then a steel strip side guide device for correcting the meandering of the steel strip. The trimmer (1) is guided by the trimmer (10) and aligned with the center of the trimmer (1)).
) will be introduced. The steel strip (
s) is trimmed at both side edges (edges) to a predetermined board width, and then the priddle roll (16,
17) and then sent to the next process.

In the above line, the steel strip (S) consists of a priddle roll (6) (hereinafter referred to as "front priddle roll") in front of the trimmer (1)) and a priddle roll (16, 17) behind the trimmer (1)) ( Since they are each pressed and held by the "rear priddle rolls" (hereinafter referred to as "rear priddle rolls"), the front priddle rolls (6) to the rear priddle rolls (1
6, 17), the relationship between the tension of the steel strip in front (on the pickling tank (1) side) and behind (on the next process side) is cut off. Therefore, the front priddle roll (
6) and the rear priddle rolls (16, 17) are not affected by the tension of the steel strips before and after them, and are tension-free by forming a loop in the looping pit (8). The state is moving along the line.

That is, in the above-mentioned line, the steel strip (s) is introduced into the trimmer (1) in a tension-free state, and therefore, the steel strip is trimmed by a drive cutting method using a rotationally driven blade. In this case, the steel strip introduced into the trimmer (1)) has little meandering (positional deviation in the horizontal direction of the line), and even if meandering occurs, the steel strip side guide device on the entry side of the trimmer (1)) Since it is easily corrected by (10), it is introduced into the trimmer (1)) in a state that is aligned with the center of the trimmer (1)), and a relatively accurate and stable trimming operation is performed.

[Problem to be solved]

As mentioned above, the conventional method of trimming in a pickling line is to perform the trimming operation without tension on the steel strip, so a looping pit (8) is required in front of the entry side of the trimmer (1). However, the line length must be increased accordingly, and a large amount of cost is required due to pit excavation, etc.

In addition, in the conventional line where a loop is provided before and after the trimmer, (i) the trimmer uses a drive-cut method, so the electric motor for driving the trimmer must be large, and the entire trimmer device requires a large space. (ii) In order to form a loop, equipment before and after the trimmer, such as an exit loop car or a tension reel, is generally installed, but there is a large piece of equipment between these to remove the tension from the steel strip. There are drawbacks such as the need for a high-capacity priddle device.

As a countermeasure for this, the looping pit (8) is omitted and the steel strip (S) is placed on the trimmer (1) with bank tension applied from the front priddle roll (6) (the tension is usually 2 to several tons). ) and try to carry out a trimming operation using the tension cut method, it is almost impossible to perform an appropriate trimming operation.

This is because if a meandering occurs in the steel strip when a tension of 2 to several tons is applied to the steel strip as described above, the steel strip side guide device (10) alone cannot resist the tension of the steel strip and cause the strip to meander. This is because the meandering cannot be corrected, and the steel strip is introduced into the trimmer (1) portion while being offset in the left-right direction from the center of the line.

If the steel strip meanderes significantly, the edge of the steel strip rides on the side guide device (10) and the edge portion breaks (edges break), making it impossible to continue the trimming operation.

Further, even if such trouble does not occur, a single trim in which only one edge of the steel strip is trimmed occurs, and the commercial value is significantly impaired.

Therefore, the tree cost should be increased (for example, 10 to 1
5m/side), and the stream speed is extremely low (
For example, the tension cut trim method that omitted the looping pit (8) was not suitable for high-speed lines because it was not possible to carry out rational trim work due to constraints such as having to lower the number of molecules at 200 m/min. was never adopted.

The present invention aims to provide a trimming method that can omit looping bits and use a tension cut method to perform rational trimming operations at high speed and with less stream formation.

[Technical means and effects]

The steel strip trimming method of the present invention is a method for tensing-streaming both edges of a steel strip after pickling treatment in a steel strip pickling line, the steel strip meandering correction device being installed in front of the entry side of the trimmer. This system corrects the meandering of the steel strip and performs trimming while controlling the opening and closing of the steel strip side guide device, the position control of the device, or the position control of the trimmer.

The present invention will be described with reference to the drawings. In FIG. 1, (12) is a steel strip meandering correction device, (14) is a steel strip side guide device, (15) is a trimmer, and (15) is a trimmer.
), after passing through the pickling tank, cold water tank, hot water tank, etc., the back-up tension (usually 2 High-speed transition occurs when loads (tons to several tons) are added.

In this line, the steel strip (S) is
), the meandering is corrected and the line is fed toward the trimmer (15) with less deviation from the center. Therefore, the load on the steel strip side guide device (work 4) and the trimmer (15) is relatively small.

According to the method of the present invention, the steel strip meandering correction device (12) corrects the meandering of the steel strip, and the steel strip side guide device (12) corrects the meandering of the steel strip.
14) Opening/closing control, position control, or trimmer (15)
position control is performed.

Opening/closing control of the steel strip side guide device (14) is performed by the device (
14) The device (14) is opened and closed in response to variations in the width of the steel strip (usually on the order of several n) in order to restrain the steel strip passing through the section from both edge sides and prevent it from meandering. , while the position control of the device (14) involves correcting the position of the device (14) in accordance with the meandering direction and amount in order to correct the meandering of the steel strip passing through the device (14). It is to be. Moreover, the position control of the trimer (15) is to correct the position of the trimer (15) so that the center of the trimer (15) matches the center of the steel strip introduced into the trimer.

Each of the above controls may be performed alone or in combination of two or more. Specific examples of preferred embodiments are as follows.

Implementation of position control of method A Nidreamer (15) Method B: Opening/closing control of steel strip side guide device (14) and trimmer (15)
Method C for controlling the position of f4: Method for controlling the position of the band side guide device (14) and the position of the trimmer (15): Opening/closing control of the steel strip side guide device (technique 4) and the position of the same device Method B of controlling: Controlling the opening and closing of the steel strip side guide device (14), the position control of the same device, and the position control of the trimmer (15). The steel strip is guided without any control and the trimmer (15)
Method B involves controlling the opening and closing of the steel strip side guide device (14) in response to changes in the strip width. At the same time, cut the trimmer (15) so that the center of the trimmer (15) matches the center of the steel strip.
In method C, the position of the steel strip side guide device (14) is corrected to correct the meandering of the steel strip, and the center of the trimmer (15) is aligned with the center of the steel strip. This is a method of performing trimming while controlling the position of the trimmer (15) so that the trimmer (15)

Method D is a method in which position control of the trimmer (15) is omitted and the steel strip is introduced into the trimmer (15) and trimmed by opening/closing control and position control of the steel strip side guide device (14).

Further, in the E method, the steel strip side guide device (14) is opened/closed and the position is controlled, and the trimmer (15) is trimmed while the position is controlled.

〔Example〕

For example, a steering roll is used as the steel strip meandering correction device (12) in the present invention. The steering roll is installed near the exit side of the front priddle roll (6). Note that a roll incorporating a steering mechanism may be installed as the front prydle roll (6), and may serve the dual roles of a prydle roll and a steel strip meandering correction device.

The steering roll as a steel strip meandering correction device is
As shown in the figure, the steel strip (
Correct the meandering of S). For example, if the steel strip (S) meanders along the body surface of the steering roll (121) from the center to the left, the roll axis should be moved by an appropriate angle depending on the degree of the deviation (meandering amount). (x) is tilted upward to the right, and the passing position of the steel strip (s) is shifted to the right side to return to the center of the line.

In order to properly correct the meandering of the steel strip using the steering roll (121), a steel strip edge detector is provided near the roll (121), and a tilting operation is performed based on the detection signal. Figure 3 shows a light sensor (20, 20) as a steel strip edge detector, which consists of a light emitter (a) and a light receiver (b) located on both the upper and lower sides of the steel strip edge and facing each other. An example of placement on both sides of the band is shown. Light emitter (a
A part of the light emitted from ) to the light receiver (b) in the shape of an arrow is received by the light receiver (b), and the rest is blocked by the edge of the steel strip (S). The light shielding area due to the steel strip edge in each sensor (20, 20) differs depending on the horizontal deviation (meandering) of the steel strip, and the meandering direction and meandering amount can be determined from the difference in the light shielding area of the two sensors (20°20). is calculated, the difference in the shade area is calculated by the controller (30), and the calculated value is inputted as an output signal to the steering roll tilting mechanism (40), thereby moving the steering roll (121) to the meandering of the steel strip. It can be tilted as much as necessary for correction. The steel strip that has passed through the steering roll (12) is sent to the steel strip side guide device (14) via a deflector roll (13).

As shown in FIG. 4, the steel strip side guide device (14) has guide parts (141, 141) in which a plurality of vertical rolls (r) are rotatably arranged in parallel, arranged on both sides of the line, The steel strip (s) is guided by bringing the body circumferential surface of the roll (r) group of each guide portion (141, 141) into contact with the side surfaces of both edges of the steel strip (s). good.

The guide parts (141, 141) of the steel strip side guide device have a set width (the two guide parts (141)
and (141)), and a guide part opening/closing mechanism for adjusting the distance between The steel strip is connected to a guide section moving mechanism that corrects the meandering of the steel strip by moving the center of the steel strip.

Opening/closing and position control of the guide parts (141, 141) are as follows:
This may be done based on a signal detected by a steel strip edge detector provided in the vicinity. To explain this with reference to Fig. 4, (50, 50) and (60, 60) are steel strip edge detectors, and each detector is placed opposite to the upper and lower sides of the steel strip edge in the same way as in Fig. 3 above. light emitter (a)
Assume that the light amount sensor is composed of a light receiver (b) and a light receiver (b). The light shielding area by the steel strip edge in each sensor changes depending on the width and meandering of the steel strip. In this case, if we calculate the sum of the light-shielding areas of the left and right pair of sensors, a change in the sum means a change in the width of the steel strip, and a change in the difference in the light-shielding area means the occurrence of meandering or the amount of meandering in the steel strip. It means change.

Now, a pair of sensors (50, 50) provided on the entrance side of the guide part (141, 141) are used as steel strip width variation detectors, and the detection signals of the sensors (50, 50,) are sent to the controller (70). When a change occurs in the board width, the calculated value is input as an output signal to the guide part opening/closing mechanism (80) and the guide part (141, 141)
When the guide parts (141, 141) are opened and closed, the width of the guide parts (141, 141) is always maintained in a state that matches the width of the steel strip. That is,
In this case, the guide part (14L 141) is the sensor (5
The width of the steel strip (S) is adjusted by controlling the opening and closing of the steel strip (S) to match the width of the steel strip (S) using a feedforward method based on the detection signals of 0 and 50). To prevent meandering caused by fluctuations in

On the other hand, the sensors (60, 60) provided on the exit side of the guide parts (141, 141) are used as steel strip meandering detectors, and the detection signal is input to the controller (70) to detect the meandering direction of the steel strip (S). and the amount of meandering, and when meandering occurs, the calculated value is input as an output signal to the guide portion moving mechanism (90) to move the guide portion (141, 141) according to the meandering direction and amount of meandering of the steel strip. By controlling the position (translation), the steel strip (S) is corrected to be located at the center of the line. That is, in this case, the guide portions (141, 14
1) The meandering of the steel strip occurring in the guide portion is corrected by a feedback method based on the detection signals of the sensors (60, 60).

FIG. 5 shows a method for controlling the set position of the trimmer (15) in addition to or in addition to controlling the set width and set position of the steel strip side guide device (14) according to the meandering of the steel strip (s). Here is an example. Steel strip side guide device (
14) and the trimmer (15), the sensor (60) as a steel strip meandering detector will be explained.
, 60) is input to the controller (90) to control the set position of the guide section (141, 141) as described above, while the detection signal is input to the controller (100) and the trimmer ( 15) The meandering direction and meandering amount of the steel strip at the entrance part are calculated, and the calculated values are input as an output signal to the movement mechanism (1)0) of the trimmer (15) to control the set position of the trimmer (15). be done.

That is, based on the signal from the sensor (60, 60), the set position of the guide part (141, 141) is corrected by a feedback method so that the center of the steel strip (S) matches the center of the trimmer (15). At the same time, based on the signal, the trimmer (15L) is moved so that the center of the trimmer blade (15L 151) matches the center of the steel strip <S>.
) is corrected using the feedforward method.

〔Effect of the invention〕

According to the present invention, in a high-speed pickling line, it is possible to carry out trim work using a tension cut method, and the trim work is extremely stable and highly accurate. It is possible to keep the trimming to less than 10 cranes on average (approximately 5 cranes/side), and it is possible to stably perform trimming of approximately 2 mm/side at the minimum width, ensuring extremely rational trimming work. can do.

Furthermore, since the looping bits used in the past are no longer required, the line length can be shortened and the cost of pit trenching etc. can be reduced. It is sufficient to use the minimum amount necessary for biting, and the site dreamer device can be made more compact. Further, the number of rolls in the priddle device can be reduced, and at the same time, the capacity of the electric motor can be reduced, and effects such as equipment cost reduction and energy saving can be obtained.

[Brief explanation of drawings]

Fig. 1 is an elevational view of a main part schematically showing a pickling line in which the present invention is carried out, Fig. 2 is an explanatory diagram of steel strip meandering correction by a steering roll, Fig. 3 is an explanatory diagram of steel strip edge detection control, 4 and 5 are control system diagrams of the steel strip side guide device, etc., and FIG. 6 is a schematic elevational view of a conventional pickling line. 12: Steel strip meandering correction device, 14: Steel strip side guide device, 15 Ni dreamer, 20, 50.60: Steel strip edge detector, 40, 70, 100: Controller.

Claims (5)

[Claims] (1) In a pickling line, a method of tension trimming by introducing the pickled steel strip into a trimmer under the action of backup tension, the steel strip meandering correction device being installed in front of the entry side of the trimmer. While correcting the meandering of the steel strip, the steel strip is guided by the steel strip side guide device installed at the entrance of the trimmer, and the trimer is moved so that the center of the trimmer matches the center of the steel introduced into the trimer. A steel strip trimming method characterized by position control. (2) The method for trimming a steel strip according to item (1) above, characterized in that the steel strip side guide device at the entrance of the trimmer is controlled to open and close in response to variations in the width of the steel strip. (3) The method for trimming a steel strip according to item (1) above, characterized in that the position of the steel strip side guide device at the entrance of the trimmer is controlled in accordance with the meandering direction and amount of the steel strip. (4) In a pickling line, a method of tension trimming by introducing the pickled steel strip into a trimmer under the action of backup tension, the steel strip meandering correction device being installed in front of the entry side of the trimmer. While correcting the meandering of the steel strip, the steel strip side guide device installed at the entrance of the trimmer is controlled to open and close in response to changes in the width of the steel strip, as well as in response to the meandering direction and amount of the steel strip. A steel strip trimming method characterized by position control. (5) In a pickling line, a method of tension trimming by introducing the pickled steel strip into a trimmer under the action of backup tension, the steel strip meandering correction device being installed in front of the entry side of the trimmer. While correcting the meandering of the steel strip, the steel strip side guide device installed at the entrance of the trimmer is controlled to open and close in response to changes in the width of the steel strip, as well as in response to the meandering direction and amount of the steel strip. to control the position,
A steel strip trimming method characterized in that the position of the trimmer is controlled so that the center of the trimmer coincides with the center of the steel strip introduced into the trimer.