JP2000246539A - Steel sheet in coil cutting method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain squareness high in accuracy by enhancing a work efficiency about adjustment on incorrect squareness for a sheared sheet. SOLUTION: In this device, a steel sheet in coil 2 is sheared off so as to be formed into a sheet. In this case, a squareness adjusting base 13 incorporated with a set of a carrying device coming in contact directly with steel sheet in coil, is interposed between a shearing machine 8 and a steering device adjusting the steel belt so as to left a feeding position of the shearing machine 8 be constant, and a means for adjusting the squareness adjusting base 13 in the horizontal direction, is also provided. By this constitution, the squareness can be accurately adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for shearing a steel strip, which can easily obtain a high-precision shear sheet squareness.

[0002]

2. Description of the Related Art For example, in a tin plating shearing line, a plated steel strip is sheared into a sheet of a predetermined size by a shearing device, and the sheared sheets are bundled and shipped. Insufficient dimensional accuracy of the sheet in the shear line includes one in which the shear length is irregular and one in which the squareness is inferior. The former is
It can be prevented by measuring the length of the sheet fed to the shearing machine with a leveler or a measuring roll and controlling the shearing length. In the latter case, it is necessary for a worker to individually adjust each machine with a long time and effort and adjust the machine to the required squareness accuracy.

[0003]

The perpendicularity of the sheet is poor when the steel strip is meandering. Therefore, in a shearing line requiring high accuracy, a free loop, a side guide, and the like are provided as a steering device that adjusts the feed position to the shearing machine to be constant in order to absorb the meandering of the steel strip. However, between the meandering absorption by the steering device and the shearing machine, a measuring roll for measuring the supply length of the steel strip, a feed roll for feeding the required length of steel strip to the shearing machine, and in some cases, a measuring roll. In many cases, the roll or the feed roll is provided with a brake roll or the like that applies rearward tension, and these devices cause a meandering of a new steel strip. In this case, the worker adjusts the pressure of each roll such as the feed roll, replaces the roll, adjusts the installation position, or installs the shearing blade at an angle of inclination of the average value of the squareness deviation. . These operations require a large workload and a long time to achieve the required accuracy.

[0004] In order to solve the above-mentioned problems, the present invention improves the work efficiency of adjusting the perpendicularity of a shearing sheet and improves the squareness accuracy of a steel strip, and a shearing method for implementing the method. It is intended to provide a device.

[0005]

Means for Solving the Problems Claim 1 according to the present invention.
The method of shearing a steel strip is a set of a conveying device that directly contacts a steel strip between a shearing machine and a steering device that adjusts a feeding position to the shearing machine in a shearing line that forms a sheet by shearing. The squareness correction base incorporating the above is adjusted in the horizontal direction with respect to the steel strip conveying direction, and the squareness of the shearing sheet is adjusted.

A shearing device according to a second aspect of the present invention is a shearing device for shearing a steel strip into a sheet, wherein the shearing device and a steering device for adjusting the feed position to the shearing device to be constant. In between, a squareness correction base incorporating a set of transfer devices that directly contact the steel strip is provided, and means for adjusting the squareness correction base in the horizontal direction is provided to adjust the squareness. The squareness correction base used here may be a worker-side squareness base, a machine drive-side squareness correction base, and a machine drive squareness correction base that may be continuous or may be divided. , Or one of them alone achieves its function.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS.
This will be described with reference to FIG. FIG. 1 is a schematic view showing a steel strip shearing device for adjusting the perpendicularity of a shearing sheet according to an embodiment of the present invention. The plated steel strip 2 is unwound from the coil 1 and its meandering is corrected by the free loop 3, and the side guide 4, the brake roll 5, the measuring roll 6,
The sheet is conveyed via a feed roll 7 and is successively sheared into sheets by a shearing machine 8 within a predetermined length and a right angle range. The squareness of the shearing sheet is defined as shown in FIG. 2 based on the plate width w and the squareness deviation δ, and the management value differs depending on the use of the shearing sheet.

FIG. 3 shows an apparatus for finally determining the squareness of a shear sheet after a meandering correction free loop. A side guide 4 for positioning the steel strip at the rise from the free loop 3, a feed roll 7 for feeding the steel strip to the shearing machine, a measuring roll 6 for measuring the supply length of the steel strip,
The free-loop steel strip is composed of a brake roll 5 used when the rear tension is insufficient due to its own weight.

Basically, a predetermined squareness can be obtained by installing the side guide 4 parallel to the conveying direction of the steel sheet and the shearing machine 8 at a predetermined angle with a predetermined accuracy. However, actually, a slight meandering may occur due to interference with the transfer device that comes into contact with the steel strip after the free loop, and a predetermined perpendicularity may not be obtained. In that case, in order to change the angle in the horizontal direction with respect to the transport direction of the steel strip by the average value of the squareness deviation, the operator adjusts the roll reduction, roll replacement, installation position adjustment of each roll such as the feeder roll, or Change the mounting angle of the shears blade. However, since these operations have no correlation between the amount of adjustment of the individual equipment and the amount of change in the squareness of the shearing sheet, it is a long trial and error operation and is inefficient.

Therefore, a squareness correction base 13 is provided on the equipment common base 12, and a set of transfer devices that come into contact with the steel strip from the side guide after the free loop to immediately before the shearing machine are collectively mounted on the squareness correction base 13. By adjusting the base 13 in the horizontal direction crossing the steel strip conveying direction by the average value of the squareness deviation, the squareness of the shearing sheet can be surely corrected in a short time.

As described above, it is preferable that the squareness correction base 13 has an integral structure in order to perform the adjustment in a short time. However, in order to reduce the frictional resistance when the squareness is corrected, the squareness correction base 13 is provided with an operator. It is also possible to divide the right angle correction base 13a, the machine drive side right angle correction base 13b, and the machine drive right angle correction base 13c, and reduce the area of each of them to the minimum area necessary to support the device above it. is there. Even if it is divided, it is necessary to move each.

The right angle correction base used here may be an operator side right angle correction base, a machine drive side right angle correction base, and the machine drive right angle correction base may be integrally continuous. , May be divided, or
Even only one of them, that is, even if the squareness correction base is composed of at least one of the worker side squareness correction base, the machine drive side squareness correction base, and the machine drive device squareness correction base, It is possible to achieve each function.

When the correction base is moved,
The steel strip may be moved while leaving it in the transfer device or after removing the steel strip. However, it can be said that moving the correction base after releasing the side guide and each roll is preferable in terms of workability.

FIG. 4 shows a specific example of the horizontal direction adjusting means of the right angle correction base 13 having an integral structure. As shown in the drawing, a squareness adjustment rotation center 19 is provided on the squareness correction base 13 on the exit side of the feed roll 7 on the steel sheet conveyance line, and is parallel to the conveyance direction of the squareness correction base 13 on the side guide 4 side. Push-pull bolts 17a and 17b for adjusting the right angle are provided on the opposite end faces. The push / pull bolts 17a, 17b are respectively supported by the push / pull bolt support 1
8a and 18b are manually rotatably held.

When correcting the squareness based on FIG. 4,
The square length average value of the sheet to be corrected is multiplied by the distance 20 between the rotation center 19 and the push-pull bolt 17a to calculate a correction length and a correction direction, and one of the push-pull bolts is calculated according to the length and direction. And pulling the other bolt,
For example, in FIG. 4, the push-pull bolt 17b is pushed out, the other bolts 17a are pulled in the opposite direction, and are slightly rotated in the horizontal direction about the rotation center 19 to adjust the squareness and improve to zero. The dashed-dotted base 13 'in the figure indicates the corrected base after the squareness correction.

Incidentally, the horizontal direction adjusting means of the right angle correction base 13 may be automatic instead of manual, and if its mechanism can move the correction base in the horizontal direction with an accuracy of about 1 mm. The invention is not limited to the illustrated one, and other known mechanisms can be employed.

[0017]

[Example] [Implementation conditions]-Applicable steel plate size 888.6 mm in width, 0.21 mm in thickness, 833.3 mm in shear length-Squareness correction base movement amount The tip of the base is moved at an angle of 0.06% in the direction of the operator. ,
That is, (average value of sheet squareness) × (distance between rotation center 19 and push / pull bolt 17a: 2000 mm) = 1.2 mm
The angle was changed.

By adjusting the depth of the loop 3, the side guide 4, the brake roll 5, the measuring roll 6, and the feed roll 7, it is possible to suppress the deviation of the squareness of the product. Table 1 shows the squareness average value and standard deviation before and after adjustment of these guides and rolls.
As a result of the adjustment, both the average value and the standard deviation are improved, but the attainable level is limited. Therefore, the results of further additional adjustment performed by the equipment to which the present invention is applied are also shown in Table 1. Although the standard deviation does not change, the average value of the squareness has been improved to zero, and the product quality has been greatly improved.

[0019]

[Table 1]

The deviation of the seat perpendicularity can be suppressed by adjusting the depth of the loop 3, the side guide 4, the brake roll 5, the measuring roll 6, and the feed roll 7. However, the three types of rolls 3,
In Nos. 4 and 5, the adjustment amounts of the individual rolls and the squareness improvement amounts do not correspond one-to-one, and the three types of rolls affect each other. As a result, after the squareness is improved to near the required accuracy, the average deviation of the squareness is reduced, but the average value is poor and the required accuracy may not be obtained. In such a case, the adjustment work is performed, but the seat perpendicularity may not be improved or may be deteriorated.

Therefore, in the present invention, it is not a further adjustment of the above three types of rolls, which is troublesome and time-consuming, but also a shear angle of a side guide, a brake roll, a measuring roll, a feed roll, etc. A complete set of transfer equipment that directly contacts the steel strip between the machine and the free loop is incorporated in the squareness correction base, and the batch is shaken in the horizontal direction that intersects the steel strip traveling direction, and the average value of the squareness is set as the target value. A method of making the average value of the squareness deviation almost zero by changing only the squareness is adopted.

[0022]

According to the present invention, it is possible to simultaneously change the set of the sheet passing device directly related to the perpendicularity of the shearing sheet in the horizontal direction with respect to the conveying direction of the steel strip by the same amount. It is possible to improve the shearing sheet effectively in a short time with the effect amount of which the squareness is predicted, and the quality of the shearing sheet is improved. In addition, productivity is improved because the adjustment time is short.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first half of a shear line of a steel strip using a squareness adjusting method according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a squareness improved by the present invention.

FIG. 3 shows a set of threading devices, such as side guides, brake rolls, measuring rolls, and feed rolls, which directly affect the shearing sheet squareness, before the shearing machine are mounted on a squareness correction base and can be collectively moved in the horizontal direction. In the schematic diagram, (a)
Is a plan view, and (b) is a front view.

FIG. 4 is a schematic plan view showing a specific example of a horizontal direction adjusting means based on a right angle correction according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Coil 2 Steel strip 3 Free loop 4 Side guide 5 Brake roll 6 Measuring roll 7 Feed roll 8 Shearing machine 9 Conveyor 10 Board width 11 Squareness deviation 12 Equipment common base 13 Squareness correction base 13a Worker side squareness correction Base 13b Machine drive side squareness correction base 13c Machine drive squareness correction base 14 Reduction gear 15 Motor 16 Shearing device 17 Push-pull bolt for squareness adjustment 18 Push-pull bolt support 19 Rotation center 20 Push-pull bolt and rotation center Distance

Claims (5)

[Claims] 1. A method for shearing a steel strip, in which a steel strip adjusted to a predetermined feed position is supplied to a shearing device and sheared, includes a set of conveying devices directly in contact with the steel strip before shearing. A method for shearing a steel strip, comprising adjusting an angle correction base in a horizontal direction and adjusting a perpendicularity of the steel strip. 2. A shearing device for shearing a steel strip into a sheet, wherein a conveying device directly contacting the steel strip between a shearing device and a steering device for adjusting a feed position to the shearing device to be constant. A shearing device for a steel strip, comprising a squareness correction base incorporating a set, a means for adjusting the squareness correction base in a horizontal direction, and adjusting the squareness. 3. The shearing device for a steel strip according to claim 2, wherein the squareness correction base comprises at least one of an operator-side squareness correction base and a machine drive side squareness correction base. 4. The squareness correction base according to claim 2, wherein the squareness correction base for the operator is a squareness correction base for the operator, the squareness correction base for the machine drive, and the squareness correction base for the machine drive unit. Steel strip shearing equipment. 5. The squareness correction base according to claim 2, wherein the squareness correction base is divided into a worker-side squareness correction base, a machine drive-side squareness correction base, and a machine drive squareness correction base. Steel strip shearing equipment.