JPH09143576A - Method for preventing meandering of strip in continuous treating equipment and clamping device for strip used to this equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a strip after connection from meandering during passing the continuous treating equipment by mutually connecting the preceding and the following strips so that a moment around the center in the width direction does not remain as much as possible, at the time of welding the end parts of the preceding and the following strips after centering in a continuous treating equipment. SOLUTION: After interposing each of the rear end part of the preceding strip 2 and the front end part of the following strip 2 between upper and lower holding parts 4U, 4L horizontally oscillatable around a vertical shaft 7, both or either one of the holding members 4U, 4L are forcedly shifted so that the center of the strip end in the width direction in matched with the center line of a strip passing line. After the tension to be loaded during passing the strip is once loaded to both strips 2 and then releasing this tension, the front end part and the rear end part of both strips 2 are cut off mutually parallel, and the front and the rear ends of these both strips 2 are welded and mutually connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip meandering prevention method in a continuous processing facility such as a continuous pickling facility or a continuous annealing facility capable of continuously stripping by welding the strip, and this facility. The present invention relates to a strip clamp device used in.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional continuous annealing facility, and the conventional technique will be described by taking this facility as an example. FIG.
In the above, as the entrance side equipment of the equipment, a pay-off reel 15, a guide roll 16, a seam welder 17 with a shear cutting function, and a washing machine 18 are sequentially provided from the upstream side. A side looping tower 19, an annealing furnace 20, a quenching facility 21, and an exit side looping tower 22 are provided. Further, as the output side equipment of the equipment, a rolling mill 23 and a take-up reel 24 for tempering the strip are provided.

In the above continuous annealing equipment, for example, the strip 25 that has undergone the cold rolling process is wound into a coil shape and set on the payoff reel 15 from the convenience of transportation and storage. The coil-shaped strip 25 is continuously annealed in the annealing furnace 2
In order to put it into 0, the rear end of the strip 25 which has been unwound previously in the equipment and the end of the succeeding coil which has been unwound, are welded to each other by the seam welder 17 and are connected to each other. As the leading strip 25 is pulled, the trailing strip 25 is continuously threaded.

In batch rolling, the leading and trailing ends of the coiled strip are unsteady portions where no tension is applied, and in many cases a so-called camber lateral bending is generated. The width center position of the leading and trailing end portions of the strip in which such a camber is generated is slightly deviated from the width center position of the steady portion. in this way,
In the strip 25 in which the camber is generated, it is rare that the trailing end of the preceding strip 25 and the leading end of the following strip 25 are off-centered to the same side to the same extent. It is necessary to forcibly move the end portion of the strip 25 to the center of the threading line and connect the strips 25 so that their width centers coincide with each other.

For this reason, in the past, the seam welder 1 has been conventionally used.
A clamp device 26 for the strip 25 as shown in FIG. This clamp device 26
A moving frame 27 in which the strip 25 is arranged so as to pass inside the frame and is provided so as to be movable in the plate passing direction and the width direction of the strip 25, and the moving frame 27.
The strip 25 inserted inside is sandwiched between the upper and lower holding members 28U and 28L vertically movably installed in the moving frame 27 so as to sandwich the strip 25 almost in the entire width direction, and the upper and lower holding members 28U and 28L. Strip 2
5 is provided with a drive unit (not shown) for moving the moving frame 27 in the same width direction so that the center in the width direction matches the center of the line.

[0006] And, conventionally, the succeeding strip 25
In general, the following steps were performed using the clamp device 26 in order to continuously process (1) In order to fix both the front and rear strips 25, the strips 25 are sandwiched by the sandwiching members 28U and 28L of the clamp device 26. (2) The width centers of the strips 25 are detected in order to connect the strips 25 so that the center lines in the width direction coincide with each other.

(3) In order to make the welding margin uniform, first, the preceding strip 25 is shear cut at a right angle to the line direction. (4) Subsequently, the clamp device 26 that holds the succeeding strip 25 is moved at a right angle in the line direction so that the center of the preceding strip 25 in the width direction coincides with the center of the succeeding strip 25 in the same direction.

(5) Shear cutting of the tip of the succeeding strip 25 at right angles to the line direction. (6) Both strips 25 are butt-seam welded with a predetermined overlap margin. (7) After applying the required tension to the strip and confirming the soundness of the weld, the subsequent strip 25 is stripped.

[0009]

When the strip 25 is continuously threaded by the welding method using the above-mentioned conventional equipment, the portion near the welding line has a V-shape as shown in FIG. 9, for example. It often became a shape and caused a large meandering. Then, as a result of pursuing the cause, the following knowledge was obtained.

That is, the strip 25, which is off-centered for the camber, is held by the clamp member 28 of the clamp device 26.
When sandwiched by U and 28L, the sandwiching members 28U and 28L are rotationally restrained, and the moving frame 27 is forcibly moved vertically in the line direction, an unreasonable deformation occurs at the end of the strip 25, and at this time, as shown in FIG. As shown in a), compressive stress is generated on the convex side of the strip 25 and tensile stress is generated on the opposite concave side.

Therefore, in particular, when the ends of both the front and rear strips 25 are moved so that the center in the width direction thereof coincides with the center of the line, the moment around the center in the width direction remains at the time of welding even if they coincide with the center of the line. For this reason, when the clamp is released to apply the tension to the strip 25 for the subsequent passage, the residual moment is released and eventually returns to the original shape as shown in FIG. The leading and trailing strips 25 will be meandered in the passing plate.

When the strip 25 meanders in the furnace as described above, not only the stripping speed is reduced but also when the meandering is large, the strip 25 comes into contact with the inner wall of the equipment to cause a product defect or damage to the equipment. If, strip 2
No. 5 fractures in the furnace, resulting in a significant reduction in production. In view of such circumstances, the present invention enables connection of the front and rear strip ends so that the moment around the center in the width direction does not remain as much as possible when performing welding after centering the front and rear strip ends in a continuous processing facility. It is intended to prevent the strip after connection from meandering during passage.

[0013]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, in the first method of the present invention, the trailing end of the preceding strip that has already been threaded into the equipment and the leading end of the subsequent strip to be threaded after this strip are welded and connected to each other. Thus, in the continuous strip processing equipment capable of continuously processing the preceding and succeeding strips, the trailing end portion of the preceding strip and the leading end portion of the following strip are horizontally shaken about the vertical axis. After sandwiching the upper and lower movable clamp members, forcibly move both or one of the upper and lower clamp members so that the widthwise center of the strip end and the center line of the strip passing line are aligned. , After applying the tension to be applied to the strips once to the strips and releasing the tension again, cut the front and rear ends of the strips parallel to each other, and By welding the front and rear ends of the two strips, characterized in that connected to each other (Claim 1).

In the first method, the upper and lower clamping members are horizontally swingable about the vertical axis (see FIG. 1).
(See), the strip end is clamped in a state where the widthwise displacement of the strip end is allowed. Therefore, even if the strip end portions are sandwiched by the upper and lower sandwiching members and the end portions are forcibly centered, the upper and lower sandwiching members follow the strip end portions and horizontally oscillate. The compressive stress and the tensile stress as shown in FIG.

Further, after the centering, the tension to be applied at the time of threading is once applied to the strip, so that the internal stress generated by straightening the bent strip end is almost eliminated by the tension load. Therefore, even if the preceding and succeeding strips are subsequently welded and the tension for passing the strip is applied again, the residual moment around the center in the width direction is hardly generated at the connecting portion.

The second method of the present invention is the same as the above-mentioned first method of the present invention, but instead of once applying a tension to be applied to both strips to the strips and then releasing the tension again, the strip end is released. The upper and lower clamping members are horizontally swung about the same vertical axis so that the moments about the vertical axis generated by the forced movement (centering) of the parts are offset (claim 2).

In this case, by forcing the upper and lower clamping members to horizontally swing after centering, the moment about the vertical axis is offset, so that the internal stress generated by correcting the bent strip ends disappears. And for this reason
After that, even if the preceding and succeeding strips are welded and a tension for passing the plate is applied, a residual moment about the center in the width direction is hardly generated at the connecting portion.

On the other hand, in the clamp device according to the present invention, the movable frame is arranged so that the strips passed through the continuous processing facility pass through the inside of the frame, and is movably provided in the strip passing direction and the width direction. And an upper and lower holding member vertically movably installed in the moving frame so as to sandwich the strip inserted in the moving frame over substantially the entire width direction thereof, and a strip sandwiched by the upper and lower holding members. And a driving means for moving the moving frame in the same width direction so that the center in the width direction thereof coincides with the center of the line, in a strip clamping device used for continuous processing equipment, wherein the upper and lower clamping members are attached to the strip. On the other hand, it is provided so as to be horizontally swingable about the vertical axis (claim 3).

In this case, in order to carry out the second method of the present invention, in addition to the above-mentioned device construction, a detecting means for detecting the moment about the vertical axis of the upper and lower clamping members and a strip by the upper and lower clamping members. An actuator that horizontally swings the upper and lower holding members in a direction in which a moment about the vertical axis generated by moving the moving frame while holding the ends of the holding member is canceled is required. ).

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a strip clamping device 1 for carrying out the method of the present invention. A pair of the clamping devices 1 are provided before and after the seam welder 17 with shear cutting function in the continuous annealing equipment shown in FIG. ing.

Of these, the clamp device 1 provided in front of the welding machine 17 clamps the rear end portion of the preceding strip 2F which has already been passed through the equipment, and is located behind the welding machine 17. The clamp 1 provided is for clamping the front end portion of the succeeding strip 2R which is to be stripped after the preceding strip 2F. The strip clamping device 1 is provided with a moving frame 3 which is arranged so that a strip 2 passed through a continuous annealing facility passes inside the frame and is movable in the sheet passing direction and the width direction of the strip 2. The upper and lower holding members 4U and 4L are erected vertically in the moving frame 3 so as to sandwich the strip 2 inserted in the moving frame 3 over substantially the entire width direction thereof. The holding members 4U and 4L are made of a rod-shaped member that is longer than the width of the strip 2.

The clamp device 1 is provided with a lateral drive means for moving the moving frame 3 in the width direction of the strip 2 and a vertical drive means for moving the strip 2 in the sheet passing direction by an actuator such as a hydraulic cylinder. There is. Of these, the lateral driving means moves the moving frame 3 in the same width direction so that the widthwise center of the strip 2 sandwiched by the upper and lower sandwiching members 4U and 4L coincides with the line center.

Vertical guide grooves 5 are formed on the inner surfaces of the left and right vertical columns of the moving frame 3, and upper and lower support grooves vertically driven by an actuator (not shown) are formed in the guide grooves 5 of the left and right vertical columns. The left and right ends of the beams 6U and 6L are fitted so as to be vertically movable. A vertical axis 7 formed in a relatively short axis is rotatably provided at the center of the upper and lower support beams 6U and 6L in the left-right direction. The central portions of the upper and lower holding members 4U and 4L are fixed to each other. Therefore, the upper and lower holding members 4U and 4L are horizontally swingably provided around the vertical axis 6 with respect to the strip 2.

Therefore, when the strip 2 is inserted between the upper and lower holding members 4U and 4L to drive the support beams 6U and 6L, the strip 2 is sandwiched by the upper and lower holding members 4U and 4L from above and below, and the moving frame 3 is moved. It is held inside, and by moving the moving frame 3 in the width direction of the strip 2 from this state, centering in the width direction of the strip 2 can coincide with the center of the threading line.

The moving frame 3 is provided with a plate width detecting sensor (not shown) for detecting the widthwise end position of the strip 2, and this sensor is connected to a microcomputer for controlling the driving means of the moving frame 3. There is. This computer calculates, based on the detection value from the plate width detection sensor, how much and in what direction the strip 2 is deviated from the line center stored therein, and the moving frame 3 is moved by this value.
It outputs so that the driving means of the above may operate.

In the continuous annealing equipment equipped with the above clamp device 1, the strips 2F, 2
By connecting R, continuous strip processing is performed. (1) The widths of the front and rear strips 2F and 2R are measured, and the strips 2F and 2R are moved so that the rotation centers (vertical axis 7) of the sandwiching members 4U and 4L that are freely rotatable coincide with the width centers of the strips 2F and 2R. Move the frame 3 to move each strip 2F, 2
Insert R.

(2) The moving frame 3 is moved so that the widthwise centers of the ends of the front and rear strips 2F and 2R coincide with the line center (arrow A in FIG. 3A). (3) The moving frame 3 is moved in the plate passing direction and the same tension as the line tension applied in the case of normal plate passing is applied to each of the preceding strip 2F and the succeeding strip 2R (see FIG. 3 (a)). Arrow B).

At this time, the rotatable holding members 4U, 4L sandwiching the strips 2F, 2R rotate, and the residual moment generated by forcibly moving the strips 2F, 2R is released. (4) After that, the applied tension is released. (5) The ends of the front and rear strips 2F and 2R are shear-cut at right angles to the line direction (arrow C in FIG. 3A).

(6) Both strips 2F, 2R are butted against each other with a predetermined overlap margin, and seam welding is performed. (7) After applying the required tension to the strip and confirming the soundness of the welded portion, the subsequent strip 2R is stripped. As described above, according to the present embodiment, since the strip 2 end is sandwiched by the upper and lower sandwiching members 4U and 4L that are horizontally swingable about the vertical axis 7, compression caused by restraining the strip 2 end is performed. No stress or tensile stress is generated, and moreover, the internal stress generated by straightening the bent strip 2 end by once applying the tension that should be applied at the time of passing through the strip 2 due to the tension load. Since they disappear, the ends of the preceding and succeeding strips 2F and 2R can be connected to each other without generating a residual moment about the center in the width direction at the connection portion.

Therefore, as shown in FIG. 3 (b), the front and rear strips 2F, 2R connected in this way are more likely to be welds that occur in the threaded strip than in the conventional case (FIG. 10 (b)). The meandering of the part will be greatly reduced. In order to confirm the effectiveness of the method of the present invention, in this case, the preceding and succeeding strips having a thickness of 1.0 mm and a width of 960 mm were subjected to continuous annealing equipment of FIG. An experiment was conducted. The result is the graph of FIG. As can be seen from the above, the meandering displacement in the connecting portion of the preceding and succeeding strips can be suppressed to about one-third of the conventional value by the method of the present invention.

FIG. 2 shows a clamp device 1 according to another embodiment of the present invention. This clamp device 1 is shown in FIG.
In addition to the above case, the detecting means 8 for detecting the moment about the vertical axis 7 of the upper and lower holding members 4U and 4L, and the moving frame 3 with the upper and lower holding members 4U and 4L holding the ends of the strip 2 therebetween. The actuator 9 horizontally swings the upper and lower holding members 4U and 4L in a direction in which the moment M about the vertical axis 7 generated by moving the.

That is, the abutting portion 10 with the strip 2 is fixed to the widthwise end edges of the upper and lower holding members 4U and 4L by the mounting pin 11, and the abutting portion 10 and the holding members 4U and 4L. The detecting means 8 including a pressure sensor such as a piezoelectric element or a strain cage is provided between the two. The pair of pressure sensors 8 are arranged at the same distance L from the vertical axis 7. The actuator 9 is composed of a hydraulic cylinder whose operating rod is connected to the ends of the holding members 4U and 4L.

In this case, if the measured values of the load from each pressure sensor 8 are W1 and W2, the upper and lower clamping members 4 are
The moment M about the vertical axis 7 generated by moving the moving frame 3 while holding the end portion of the strip 2 between U and 4L can be calculated by M = (W1−W2) · L. Therefore, if the upper and lower clamping members 4U and 4L are horizontally oscillated by the actuator 9 to cancel the moment M about the vertical axis 7, the bent strips are bent in the same manner as when tension is applied to each strip 2. The internal stress generated by correcting the two ends can be eliminated. The actuator 9 can be controlled by the microcomputer that controls the driving means of the moving frame 3 described above.

On the other hand, FIG. 5 shows a clamp device according to still another embodiment of the present invention. This clamp device is different from that of FIG. 1 in that the support beams 6U and 6L are fixed to the movable frame 4. Left and right pair of cylinders 12U, 12
It is movably supported up and down via L. Therefore, in this case, the guide grooves 5 for vertically guiding the both ends of the support beams 6U and 6L are unnecessary.

FIG. 6 shows a seam welder 17 having a shear cutting function, which incorporates the clamp device 1 of the present invention. The welder 17 has an inlet moving frame 3 and an outlet moving frame 3 '. A cutting machine including a pedestal 13L and a shear 13U that fits into a cutting groove formed on the upper surface of the pedestal 13U and cuts the strip. The movable frames 3 and 3'are independently movable before and after the shear cutting machine, and the succeeding strips 2R are clamped by the clamping members 4U and 4L in the inward moving frame 3 and are moved out. Holding members 4U ', 4 in the frame 3'
The preceding strip 2F is clamped by L '.

Incidentally, the electrode wheel of the welding machine is not shown in FIG. 6 because it overlaps with the shear. In addition, the welding machine 17 of FIG.
Any of the clamping devices 1 shown in FIGS. 1, 2 and 5 can be incorporated in the. In the above embodiment, the continuous annealing equipment is described as an example, but the present invention can be applied to continuous pickling equipment and other continuous strip processing equipment.

[0037]

As described above, according to the present invention,
Since the front and rear strip ends can be connected to each other so that the moment around the center in the width direction does not remain as much as possible, the meandering of the welded part that occurs during stripping is greatly reduced and the stripability is greatly improved. Productivity in continuous processing equipment is significantly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a clamp device according to an embodiment of the present invention.

FIG. 2 (a) is a plan view of a clamp device showing another embodiment of the present invention, and FIG. 2 (b) is a side view thereof.

FIG. 3A is a plan view showing a strip connection procedure in the method of the present invention, and FIG. 3B is a plan view of the strip after connection.

FIG. 4 is a graph of experimental results comparing the method of the present invention with the conventional method.

FIG. 5 is a perspective view of a clamp device according to another embodiment of the present invention.

FIG. 6 is a side view of a seam welder with a shear cutting function, which incorporates the clamp device of the present invention.

FIG. 7 is a side view showing an outline of continuous annealing equipment.

FIG. 8 is a perspective view of a conventional clamp device.

FIG. 9 is a plan view showing an example of a camber seen at a front-rear end connection portion of a strip.

FIG. 10 (a) is a plan view showing a strip connection procedure in the conventional method, and FIG. 10 (b) is a plan view of the strip after connection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamping device 2 Strip 2F Preceding strip 2R Subsequent strip 3 Moving frame 4U Upper clamping member 4L Lower clamping member 7 Vertical axis 8 Detecting means (pressure sensor) 9 Actuator M Moment

Claims (4)

[Claims] 1. Welding a trailing end of a preceding strip (2F) which has already been threaded in a facility and a leading end of a subsequent strip (2R) which is to be stripped following this strip (2F). In the strip continuous processing facility, the front and rear strips (2F) (2R) can be continuously threaded by connecting them to each other by connecting them to each other. After sandwiching the front end portion of the strip (2R) with the upper and lower clamping members (4U) and (4R) which are horizontally swingable about the vertical axis (7), the upper and lower clamping members (4U) and (4R) Both or one of them is forcibly moved so that the center of the strip end in the width direction and the center line of the strip running line coincide with each other, and the tension to be applied during strip running is applied to the strips (2F).
After the (2R) is loaded once and the tension is released again, the front and rear ends of the strips (2F) and (2R) are cut parallel to each other, and the strips (2F) and (2R) are cut.
A method for preventing the strip from meandering in continuous processing equipment, characterized in that the front and rear ends of R) are welded and connected to each other. 2. Welding the trailing end of the preceding strip (2F) which has already been threaded in the installation and the leading end of the following strip (2R) which is to be threaded following this strip (2F). In the strip continuous processing facility, the front and rear strips (2F) (2R) can be continuously threaded by connecting them to each other by connecting them to each other. After sandwiching the front end portion of the strip (2R) with the upper and lower clamping members (4U) and (4R) which are horizontally swingable about the vertical axis (7), the upper and lower clamping members (4U) and (4R) Both or one of them is forcibly moved so that the center of the strip end in the width direction and the center line of the threading line coincide with each other, and the moment (M) about the vertical axis (7) generated by this forcible movement. Is The upper and lower clamping members (4U) and (4R) are horizontally swung around the same vertical axis (7) in the same direction, and the front and rear ends of the strips (2F) and (2R) are parallel to each other. Cut into two strips (2F) (2
A method for preventing the strip from meandering in continuous processing equipment, characterized in that the front and rear ends of R) are welded and connected to each other. 3. A moving frame (2) arranged so that a strip (2) passed through a continuous processing facility passes through the inside of the frame and movably provided in a strip passing direction and a width direction of the strip (2). 3) and a stripping member (2) inserted in the moving frame (3) so as to sandwich the strip (2) over substantially the entire widthwise direction thereof. 4U) (4R),
And a drive means for moving the moving frame (3) in the same width direction so that the widthwise center of the strip sandwiched by the upper and lower holding members (4U) and (4R) coincides with the line center. In a strip clamp device used for processing equipment, the upper and lower clamping members (4U) (4R) are provided so as to be horizontally swingable around a vertical axis (7) with respect to the strip (2). Strip clamping device. 4. A detection means (8) for detecting a moment (M) about the vertical axis (7) of the upper and lower clamping members (4U) (4R) is provided, and the upper and lower clamping members (4U) (4R). In the direction in which the moment (M) about the vertical axis (7) generated by moving the moving frame (3) while holding the end portion of the strip (2) between the upper and lower holding members ( 4. The strip clamping device according to claim 3, further comprising an actuator (9) for horizontally swinging the 4U and 4R.