JP3617086B2 - Metal strip shearing method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a metal band shearing method in which a metal band such as a steel band is unwound from a coil and sheared to a predetermined length by a shearing machine.
[0002]
[Prior art]
First, the structure of the metal line shear line according to the present invention will be described with reference to FIGS. 4 is a front view of the main part of the shear line, FIG. 5 is also a plan view, 1 is a measuring roll, 2 is a leveler, 3 is a pinch roll, 4 is a shearing machine, 5, 6 and 7 are belt conveyors, S is Steel strip C is a sheet after shearing. The steel strip S unwound from the coil by a rewinding machine (not shown) is fed leftward by the pinch rolls 1 and 3, corrected by the leveler 2, sheared by the shearing machine 4 into a sheet C, and the belt conveyors 5 and 6. 7 are stacked on a pillar (not shown), and are packed and shipped together for each lot.
[0003]
Here, the shearing in the shearing machine 4 is generally performed by a flying shearing method such as a rotary shearing while the steel strip S is moved at a constant speed, and the sheet C after shearing is separated from the rear steel strip. The conveyor on the outlet side of the shearing machine is set at a slightly higher speed than the moving speed of the rear steel strip. Similarly, in order to widen the interval between the sheets C for convenient inspection and classification downstream, Normally, the speed of 7 is set to increase sequentially.
[0004]
As dimensional accuracy defects in the shear line, there are shear angle unevenness and perpendicularity of the shear plane. The perpendicularity failure of the shear plane occurs when the shape of the steel strip itself is bad and when the steel strip is meandering.
In order to eliminate the perpendicularity failure of the shearing surface, a means for detecting the perpendicularity of the shearing surface and correcting it is necessary.
[0005]
First, assuming that the sheet is correctly sheared at a right angle, the meandering amount of the sheet being conveyed (hereinafter referred to as “inclination angle” in the case of an angle) can be measured by the method shown in FIG.
Detectors A and B are provided at a predetermined interval W in a direction perpendicular to the sheet conveyance direction, and the time difference t between the time when the leading edge E of the conveyed sheet S passes the detector A and the time when it passes the detector B , L shown in the figure from the conveyance speed v of the sheet S is
L = vt
From this L and W,
α = tan ⁻¹ (L / W)
Can determine the inclination angle α.
[0006]
FIG. 7 shows a method for measuring the squareness of a steel sheet described in JP-A-55-67606. Based on the principle explained in FIG. 6, the squareness of the steel sheet itself is measured together with the inclination angle of the steel sheet being conveyed. The detectors A and B are provided at a predetermined interval W _{1 and} the detectors C and D are provided at a predetermined interval W ₂ on the same straight line perpendicular to the sheet conveyance direction.
A time difference t ₁ between the time when the leading edge E ₁ of the conveyed sheet S passes the detector A and the time when it passes the detector B;
A time difference t ₂ between the time when the trailing edge E ₂ of the sheet S passes the detector A and the time when it passes the detector B;
A time difference t ₃ between a time point when the side edge E ₃ of the sheet S passes the detector C and a time point when the side edge E ₃ passes the detector D is detected, and from each time difference and the conveyance speed v of the sheet S,
L ₁ = vt ₁
L ₂ = vt ₂
L ₃ = vt ₃
α = tan ⁻¹ (W ₂ / L ₃ )
θ = tan ⁻¹ (L ₁ / W ₁ ) −α
φ = tan ⁻¹ (L ₂ / W ₁ ) + α
The meandering amount (inclination angle) α, the perpendicular angle θ of the leading edge E ₁ of the sheet S, and the perpendicular angle φ of the trailing edge E ₂ of the sheet S are calculated by the following equations.
[0007]
Japanese Patent Application Laid-Open No. 5-116021 describes a method for controlling the perpendicularity of a shear sheet based on the measurement result of the meandering amount. That is, as shown in FIG. 8, with respect to the steel strip before shearing, by changing the rolling force distribution in the roll axis direction of the pair of upper and lower pinch rolls, the steel strip is moved in the width direction to perform coarse adjustment. At the same time, a rubber roll (not shown) disposed on the upper side or the lower side of the steel strip is pushed in the direction perpendicular to the axis, whereby the steel strip is moved in the width direction for fine adjustment.
[0008]
However, for example, if the squareness of a sheet after shearing is measured on a conveyor, the squareness of the sheet itself cannot be corrected, and it is difficult to confirm the cause of meandering and to correct the meandering amount. Further, the method of correcting the meandering before shearing has a drawback that the perpendicularity defect that occurs during shearing cannot be corrected.
[0009]
[Problems to be solved by the invention]
The present invention provides a metal band shearing method that solves such problems, detects the meandering of the sheet at the time of shearing, corrects the sheet to the right angle with respect to the shearing machine, and then performs shearing. With the goal.
[0010]
[Means for Solving the Problems]
In the present invention, a meandering amount detector for detecting the position in the width direction of the metal band is installed on the inlet side and the outlet side of the shearing machine in the shear line that shears the metal band to a predetermined length to form a sheet. According to the meandering amount of the metal band, the magnetic force of the magnet disposed in the belt conveyor provided on the outlet side of the shearing machine is changed in the width direction to correct the meandering of the metal band, and then shearing is performed. This is a metal sheet shearing method, and more specifically, the metal band shearing method in which the magnetic force of a magnet disposed in a belt conveyor is changed in the width direction in proportion to x in the following equation.
[0011]
x = (a ₁ −a ₂ ) W / b
Where a ₁ , a ₂ : position in the width direction of the metal band on the entry side and the exit side of the shearing machine W: width of the metal band,
b: Distance between meandering detectors on the inlet side and outlet side of the shearing machine.
[0012]
[Operation]
According to the present invention, meandering amount detectors for detecting the position in the width direction of the metal strip are installed on the entry side and the exit side of the shearing machine, and the position in the width direction of the metal strip on the entry side and the exit side of the shearing machine. Therefore, the amount of meandering of the metal band can be detected as the difference, and the magnetic force of the magnet arranged in a pair in the width direction on the output belt conveyor is adjusted according to the amount of meandering, and the metal band just before shearing is adjusted. Since the shearing is performed after correcting the meandering amount, the perpendicularity of the sheet is improved, the sheet conveyed on the delivery belt conveyor is not meandering, and trouble-free processing is performed even in downstream equipment such as a pillar. be able to.
[0013]
【Example】
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the vicinity of a shearing machine in the steel strip shearing line of this embodiment, and FIG. 2 is a plan view of the same. The reference numerals are the same as those used in the description so far, 8, 9 are support rolls, 10 (10a, 10b) are a pair of electromagnets installed on the back surface of the belt conveyor 5, 11 is the belt conveyor 6 The permanent magnets 12 and 13 are disposed on the front and rear surfaces of the shearing machine 4, and 14 is a controller.
[0014]
Fig.3 (a) is explanatory drawing which shows the steel strip S in a meandering state. As described above, the meandering amount detectors 12 and 13 are disposed before and after the shearing machine 4. The distance from the steel strip S detected when the tip of the steel strip S before shearing passes through the meandering amount detector 12 is a ₁ , and the distance from the steel strip S by the meandering amount detector 13 at this time is a ₂ When the distance between the meandering detectors 12 and 13 is b and the width of the steel strip S is W, the meandering tendency of the steel strip can be known by the sign and size of (a ₁ -a ₂ ), The absolute amount of meandering amount x is
x = (a ₁ −a ₂ ) W / b
It can be calculated by
[0015]
If shearing is performed as it is, the XX line in FIG. 3A is the shearing line of the shearing machine 4, and therefore the shearing line, that is, the edge of the sheet, is inclined by the inclination angle α with respect to the perpendicular direction.
If the steel strip S meanders toward the operator side (upper side in FIG. 3) as shown in this figure (a ₁ <a ₂ ), the tip of the steel strip S before shearing shown in FIG. Among the pair of electromagnets installed on the back surface of the belt conveyor 5, the magnetic force of the operator-side one 10b is applied to the drive-side one 10a in the first belt conveyor 5 on the shearing machine exit side. Strengthen by an amount proportional to x. Since the moving speed of the belt conveyor 5 is set slightly faster on the inlet side of the shearing machine 4, the steel strip S is attracted to the electromagnet 10b, and the moving amount on the operator side increases, and the meandering is corrected. As shown in (b), when shearing is performed when a ₁ = a ₂ , shearing is performed at right angles by the cutting line XX.
[0016]
When the detected meandering amount is a ₁ > a ₂ , the magnetic force of the drive-side one 10a among the pair of electromagnets installed on the back surface of the belt conveyor 5 is increased. The above calculation and control are performed by the controller 14.
As described above, in the present invention, the meandering amount is corrected from the time when the tip of the steel strip S enters the meandering amount detector 13 installed on the exit side of the shearing machine until the shearing is completed. As a result, the perpendicularity during shearing was improved, and the incidence of defective products due to a right angle deviation was reduced by about 0.2%.
[0017]
【The invention's effect】
According to the present invention, by correcting the meandering of the steel strip immediately before shearing on the conveyor and then performing shearing, the right angle defect of the sheet is reduced and the belt conveyor is transported without meandering. Excellent effects such as reduction of wrinkles at the edge of the sheet by the apparatus or the like can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing a main part of a steel strip shear line in an embodiment of the present invention.
FIG. 2 is a plan view showing a main part of a steel strip shear line in an embodiment of the present invention.
FIG. 3 is an explanatory view showing a meandering state of a steel strip in an embodiment of the present invention.
FIG. 4 is a front view showing a main part of a steel strip shearing line according to the present invention.
FIG. 5 is a plan view showing a main part of a steel strip shear line according to the present invention.
FIG. 6 is an explanatory view showing a meandering state of a steel strip in the prior art.
FIG. 7 is an explanatory view showing a meandering state of a steel strip in another conventional technique.
FIG. 8 is a perspective view showing still another conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Measuring 2 Leveler 3 Pinch roll 4 Shearing machine 5, 6, 7 Belt conveyor 8, 9 Support roll 10 Electromagnet 11 Permanent magnet 12, 13 Meander amount detector 14 Controller S Steel strip C Sheet

Claims (2)

In a shear line that shears the metal strip to a predetermined length to form a sheet, meandering amount detectors that detect the position in the width direction of the metal strip are installed on the entry side and the exit side of the shearing machine, and the detected metal strip The shearing of the metal sheet is characterized by performing the shearing after correcting the meandering of the metal band by changing the magnetic force of the magnet arranged in the belt conveyor provided on the exit side of the shearing machine according to the amount of meandering of the metal belt. Method. The method of shearing a metal strip according to claim 1, wherein the magnetic force of the magnet disposed in the belt conveyor is changed in the width direction in proportion to x of the following equation.
x = (a ₁ −a ₂ ) W / b
Where a ₁ , a ₂ : position in the width direction of the metal band on the entry side and the exit side of the shearing machine W: width of the metal band,
b: Distance between meandering detectors on the inlet side and the outlet side of the shearing machine.

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