JP4479404B2 - Metal band notching method and metal band continuous processing line in metal band continuous processing line - Google Patents

Description

  The present invention relates to a metal band notching method and a metal band continuous processing line in a metal band continuous processing line.

In a continuous processing line for a metal band such as a steel band, the metal band is continuously processed by joining the tail end of the preceding metal band and the tip of the subsequent metal band by welding.
However, for example, as shown in FIG. 5, when the width of the preceding metal band 101 and the width of the subsequent metal band 102 are different, a step 200 is generated in the width direction at the joint 103 between the metal bands 101 and 102. When the step 200 is caught somewhere on the continuous processing line, for example, stress concentrates on the end portion in the width direction of the joint 103, and in a severe case, the metal bands 101 and 102 may break. .

In this way, in order to prevent stress from concentrating on the width direction end portion of the joint portion 103 and leading to breakage, notches 104 and 105 such as arcs are provided so as to cover both width direction end portions of the joint portion 103. Has been conventionally performed (see, for example, Patent Document 1 and Patent Document 2).
The notching equipment 1 used for this notching is, for example, equipment provided with an upper blade 11 that can be moved up and down and a guide 12 having a lower blade (not shown) inside, and is a metal for a welding machine that joins metal bands. It is arranged downstream in the transport direction of the belt. And when the joining part 103 of the metal strip joined by the welding machine is conveyed, the upper blade 11 of the notching equipment 1 is moved up and down to cut out the region covering both ends of the joining part 103 in the width direction.

FIG. 6 is a schematic configuration diagram showing a part of a continuous annealing line of a conventional cold-rolled steel strip (hereinafter simply referred to as “steel strip”), and FIG. 7 is a schematic front view of a conventional notching facility.
In this steel strip continuous annealing line 10, as shown in FIG. 6, a payoff reel 3, a welding machine 6, a notching facility 1, and a bridle roll 4 are arranged in order from the upstream side in the transport direction of the steel strip. , Tension adjusting means 8 and controller 7.

The payoff reel 3 unwinds the coiled steel strip in order from the tip toward the continuous annealing line of the steel strip, and finally pays out the tail end.
The welding machine 6 joins the tail end of the preceding steel strip 101 and the leading end of the succeeding steel strip 102, which are continuously conveyed, by welding.
As shown in FIG. 7, the notching equipment 1 includes a lifting hydraulic cylinder 13, an upper blade 11, a guide 12, and a traveling hydraulic cylinder 14, with both ends in the width direction sandwiching the steel strips 101 and 102. It is arranged opposite to the side.

When the joined portion joined by welding is conveyed, the conveyance of the steel strips 101 and 102 is temporarily stopped so that the portion is directly below the upper blade 11.
The upper blade 11 is connected to an elevating hydraulic cylinder 13 via a link device, and can be moved up and down by driving the elevating hydraulic cylinder 13, that is, movable in the steel plate thickness direction. By doing so, the steel strips 101 and 102 can be sandwiched and sheared between the guide and lower blade (hereinafter also simply referred to as guide) 12. By doing so, both the width direction both ends of the steel strips 101 and 102 are excised so that it may straddle both the steel strips 101 and 102 with the joining part.

When the cutting is completed, the upper blade 11 is raised by driving the lifting hydraulic cylinder 13.
And if the upper blade 11 raises, conveyance of the steel strips 101 and 102 will be restarted, and the junction part after excising the width direction both ends will be conveyed downstream with the steel strips 101 and 102.
Incidentally, the raising / lowering hydraulic cylinder 13 raises and lowers the upper blade 11 in the direction of the arrow indicated by the symbol B in response to an ascending / descending command from the controller 7, but can only be operated to the ascending / descending limit. It cannot be stopped with.

Moreover, the guide 12 has a lower blade (not shown) different from the upper blade 11 inside, and is disposed to face the lower side of the upper blade 11, and when cutting with the upper blade 11, the steel strip 5 is moved from its lower side. support. Does not work. It is fixed.
The notching equipment 1 is configured such that the main body 1c travels in the arrow direction indicated by the symbol A by the travel hydraulic cylinder 14 on the travel straight rail 1a and can stop at a desired position.

  The traveling hydraulic cylinder 14 advances the upper blade 11 together with the notching equipment 1 to the cutting position, and also retracts the upper blade 11 to the retracted position so as to be separated from the conveying path L of the steel strips 101 and 102. Since the steel strip has various widths, the cutting position changes accordingly. Usually, during the operation of the continuous annealing line 10 of the steel strip, the notching equipment 1 follows the change of various cutting positions, but basically keeps moving forward. Only when the operation stops for many hours like this, the notching equipment 1 is retracted to the retracted position.

Incidentally, the traveling hydraulic cylinder 14 can adjust the cutting position by advancing the upper blade 11 to a desired position in accordance with a command from the controller 7, but it is not necessary to stop halfway when retracting. I try to retreat to the limit.
The bridle roll 4 is a drive roll for conveying the steel strips 101 and 102.
Returning to FIG. 6, the tension adjusting means 8 means an electric motor (not shown) that drives one or both of the bridle roll 4 and the payoff reel 3, and the circumference of either one or both of the bridle roll 4 and the payoff reel 3. By adjusting the speed, it has a function of adjusting the tension of the steel strips 101 and 102 between the payoff reel 3 and the bridle roll 4. Further, the tension of the steel strips 101 and 102 is adjusted to the command value of the tension received from the controller 7.

  The tension adjustment by the tension adjusting means 8 is performed by adjusting the field current of the electric motor that is the tension adjusting means 8. The relationship between the field current and the output torque of the electric motor corresponding to the field current is measured in advance, and when the tension command value is sent to the tension adjusting means 8, the previously measured field is measured. Based on the relationship between the magnetic current and the output torque of the electric motor corresponding to the field current, it is output from the tension adjusting means 8.

Assuming that the steel strips 101 and 102 are both flat, the lower surface in the plate thickness direction is referred to as a pass line (indicated as PL in FIG. 7). The pass line PL is connected to the copper strips 101 and 102. With the acting tension, it is usually kept slightly above the upper surface of the guide 12 by d (several tens of millimeters, in many cases 10 to 50 mm), and the steel strips 101 and 102 are lowered by the upper blade 11 during notching. At the same time, it is pushed down by the upper blade 11 and sheared between the lower blade (not shown) installed in the guide 12, and the notches 104 and 105 described above are formed at both ends in the width direction of the steel strips 101 and 102. Is done.
Japanese Utility Model Publication No. 60-84207 JP-A-61-288915

Conventionally, the upper blade 11 only moves to the ascent and descent limit, and cannot be stopped halfway. Further, the guide / lower blade 12 was fixed and could not be operated.
That is, the preceding steel strip 101 or the succeeding steel strip 102 is not necessarily flat, and there are not a few cases in which the steel strip 101 remains after the welding with the welding machine 6 and warps in the width direction of the steel strip. Due to both, there were the following problems.

  The problem is that the width edge of the portion of the trailing steel strip 102 formed with a circular arc-shaped notch is warped in the direction of warping (upward or downward) and the amount of the upper and lower blades after notching. At the moment when conveyance is resumed, a tensile force is applied to the joint, and the part may break on the spot without being transported downstream. That is.

For example, when the amount of warpage of the steel strip 101 or 102 is large in the downward direction, as shown in FIG. 8, the portion of the trailing steel strip 102 in which a notch such as an arc shape is formed in the lower blade inside the guide 12. There is a case where the end of the width is caught.
Moreover, although not shown in figure, the width end in the part of the subsequent steel strip 102 in which the upper blade 11 is formed with a notch such as an arc may be caught.

When the joint breaks, the conveyance of the steel strips 101 and 102 is stopped over the entire continuous annealing line 10 of the steel strip, and as a result, the operation of the continuous annealing line of the steel strip is interrupted for many hours. .
The present invention has been made to solve the above-mentioned problems of the prior art, and the width end of the steel strip portion formed with a circular arc-shaped notch is formed between the upper and lower blades after notching. Provided is a metal strip notching method and a metal strip continuous processing line that can be prevented from being broken on the spot when it is caught on one side and transport is resumed. This is the issue.

In order to solve the above-mentioned problems, the invention according to claim 1 is a notching method for a metal strip in a continuous treatment line for a metal strip, in the width direction of a steel strip conveyed to a notching facility via a welding machine. Based on the measured value of the warping amount measuring means that measures the amount of warping at the entry side of the notching equipment, both the upper and lower blades of the notching equipment are caught with the metal band that has warped in the width direction after notching. The position adjustment is performed up to a position where it can be avoided.
The invention according to claim 2 is the notching method of the metal strip in the continuous processing line of the metal strip according to claim 1, wherein the position adjustment is performed according to the amount of warp in the width direction of the metal strip. It is characterized by doing.

The invention according to claim 3 is a continuous processing line for a metal strip, wherein the amount of warpage in the width direction of the metal strip conveyed to the notching facility for the metal strip via a welding machine is measured . In accordance with the warp amount measured by the warp amount measuring means, the position adjusting means for adjusting the position of the upper and lower blades of the notching equipment in the metal strip thickness direction, and the warp amount measuring means. And a controller that outputs a command to the position adjusting means so as to move the upper and lower blades of the notching equipment to a position after the notching so as to avoid catching with the metal band warped in the width direction. It is said.

  According to the present invention, when the width end of the steel strip portion formed with a notch such as an arc shape is caught by one of the upper and lower blades after notching, and the conveyance is resumed, It is possible to provide a metal band notching method and a metal band continuous processing line in a continuous metal band processing line that can prevent breakage in the field.

Hereinafter, an embodiment of a continuous treatment line for a metal strip according to the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a schematic configuration diagram showing a part of a continuous annealing line of a steel strip according to an embodiment of the present invention, and FIG. 2 is a schematic front view of a notching facility.
The continuous annealing line 10 basically follows the conventional one shown in FIG. As shown in FIG. 1, a payoff reel 3, a welding machine 6, a warp detector 2, a notching facility 1, and a bridle roll 4 are arranged in this order from the upstream side in the conveying direction of the steel strip 5, and a controller 7 and the like are provided. ing. A warp detector 2 is added to the conventional one.

The warpage detector 2 is a means for measuring the amount of warpage of the steel strip 5.
Specifically, the warp detector 2 can measure the warp amount X (see FIG. 2) in the width direction W of the steel strip 5 conveyed from the payoff reel 3 via the welding machine 6 to the notching facility 1. Here, as the warp detector 2, for example, a plurality of non-contact distance meters such as lasers arranged in parallel in the width direction W is used as an example above the conveyance path L through which the steel strip 5 is conveyed. . And in the controller 7, based on the measured value of each non-contact type distance meter, the curvature amount of the width direction W of the steel strip 5 is comprised so that calculation is possible. In addition, if a plurality of these non-contact distance meters are arranged in the longitudinal direction of the conveyance path L, the amount of warpage in the longitudinal direction can be measured, and if a plurality of units are arranged in parallel in both the width direction W and the longitudinal direction, The amount of warpage in both the width direction W and the longitudinal direction can be measured.

Next, the notching equipment 1 used for the continuous annealing line 10 of the steel strip 5 which is one embodiment of the present invention will be described.
The notching equipment 1 is a device that shears the steel strip 5 between an upper blade 11 and a guide / lower blade 12 to form a notch such as an arc shape, as in the prior art.
Like the conventional one, the main body 1c travels on the traveling straight rail 1a by the traveling hydraulic cylinder 14, and can be stopped at a desired position, as shown in FIG. In addition to the guide 12 and the first elevating hydraulic cylinder 13, a second elevating hydraulic cylinder 15 is provided.

The first lifting hydraulic cylinder 13 receives an inflow side and an outflow into the first lifting hydraulic cylinder 13 when a command value for the amount of movement from the controller 7 is input to a hydraulic valve such as a servo valve (not shown). The height of the upper blade 11 can be adjusted to a desired position in the vertical direction via the link device by changing the inflow amount of the hydraulic oil on each side.
On the other hand, the guide 12 is placed on the rod side of the second lifting hydraulic cylinder 15. The second raising / lowering hydraulic cylinder 15 also has an inflow side and an outflow to the second raising / lowering hydraulic cylinder 15 when a command value for the amount of movement from the controller 7 is input to a hydraulic valve such as a servo valve (not shown). The height of the guide 12 can be adjusted to a desired position in the vertical direction by changing the inflow amount of the hydraulic oil on each side. Here, the second lifting hydraulic cylinder 15 that lifts and lowers the guide 12 does not move up and down when the upper blade 11 is lowered. For example, the position is maintained at a position (reference position) where the upper surface of the guide 12 is slightly d below the pass line PL in a state in which the tension is applied to the steel strip 5. The arrows shown indicate the direction of movement of the guide 12 by the second lifting hydraulic cylinder 15.

Next, the controller 7 will be described in detail.
The controller 7 is similar to the first and second lifting and lowering hydraulic cylinders described above so that the upper blade 11 and the lower blade (not shown) in the guide 12 are moved to a position where the catching with the steel strip 5 can be avoided after notching. It is a device that outputs a command to a correct position adjusting means.
Specifically, the controller 7 temporarily stores a CPU, a storage medium such as a ROM that stores a control program for the CPU, data read from the storage medium, and calculation results necessary for the calculation process of the CPU. RAM, a hydraulic valve such as a servo valve, and an interface I / F for inputting / outputting data to / from an external device such as a warp detector 2. The CPU can start a program stored in the storage medium and execute processing for adjusting the relative positional relationship shown in the flowchart of FIG. 3 according to the program.

FIG. 3 is a flowchart of a program that executes processing for adjusting the relative positional relationship, which is executed by the controller 7.
When the operation is performed in the continuous annealing line of the steel strip, the program is executed in the controller 7, and the process proceeds to step S1. In step S1, information on the warp amount X in the width direction W is read from the warp detector 2 described above, and the process proceeds to step S2.

In step S2, it is determined whether or not the warpage amount X exceeds a certain reference value based on the read information on the warpage amount X in the width direction W. That is, when the warpage amount X exceeds a certain reference value, the process proceeds to step S3. If the warpage amount X does not exceed a certain reference value, the process returns to step S1.
Here, as a certain reference value of the warp amount X, the notch of the steel strip portion in which a notch such as an arc shape is formed after notching the steel strip 5 with the above-described notching equipment 1 is notching. The lower limit values of the warpage amount X of the upper warp (+) and the lower warp (−) that are caught by either the rear upper blade 11 or the lower blade in the guide 12 are set. In the present embodiment, as shown in Table 1 below, 9 mm is set as a certain reference value for the amount of warpage X of the upper warp (+) and the lower warp (−). That is, according to the research by the inventors, the gap between the upper blade 11 and the guide 12 in a state where the upper blade 11 is in the ascending limit, the pass line PL of the steel strip, and more precisely, the steel strip 5 From the relationship of the thickness of the steel strip (the thickness of the trailing steel strip is more important), if the warp amount X of the steel strip 5 is within a range of ± 9 mm, the steel strip 5 and the upper blade 11 or the guide 12 This is done because it is known from geometry and experience that there is no catch.

Next, in step S3, it is determined whether the warp is an upward warp (+) or a downward warp (-). That is, when the warpage is an upward warp (+), the process proceeds to step S4, and when the warp is a downward warp (-), the process proceeds to step S6.
In step S4, first, a command for moving the guide 12 to return to the reference position is output to the hydraulic valve of the second lifting hydraulic cylinder 15 to return the guide 12 to the reference position, and the process proceeds to step S5. In step S5, based on the read information on the warp amount X in the width direction W, the upper blade 11 can be prevented from being caught by the steel strip 5 in which the warp amount (+) is generated by the warp amount X. A command for adjusting the position in the steel plate thickness direction is output to the hydraulic valve of the first elevating hydraulic cylinder 13 to raise the upper blade 11 to such a position.

  Specifically, in the present embodiment, the upper blade 11 can be raised to a position where it does not get caught by the steel strip 5 in accordance with the amount of warpage X of the upward warp (+) in the width direction W of the steel strip 5. Thus, the command value is set in three stages as shown in Tables 1 (a) to (c). The controller 7 refers to the data table set in these three stages, and outputs the command value at the stage corresponding to the warp amount X to the hydraulic valve of the first lifting hydraulic cylinder 13 so that the upper blade 11 is moved as such. Raise to the correct position.

By these step S4 and step S5, the upper blade 11 and the lower blade in the guide 12 are adjusted to a position where they can avoid catching with the steel strip 5 after notching, and then returned to the original position to perform the next notching operation. Waiting to be done.
On the other hand, in step S6, first, a command to move the upper blade 11 to a similar reference position that is not caught if the steel strip 5 is not warped is output to the hydraulic valve of the first lifting hydraulic cylinder 13. The upper blade 11 is raised to such a position, and the process proceeds to step S7. In step S7, the guide 12 is moved to a position where it is possible to avoid catching the steel strip 5 with the warpage amount (−) by the warpage amount X based on the read information on the warpage amount X in the width direction W. A command for adjusting the position in the thickness direction of the steel strip to be lowered is output to the hydraulic valve of the second lifting / lowering hydraulic cylinder 15 to lower the guide 12 to such a position.

  Specifically, in this embodiment, the guide 12 can be lowered to a position where the steel strip 5 is not caught by the steel strip 5 in accordance with the magnitude of the warp amount X of the downward warping (−) of the steel strip 5 in the width direction W. The command values are set in three stages as shown in Tables (d) to (f). The controller 7 refers to the values in the data table set in the three stages, and outputs the command value at the stage corresponding to the warp amount X to the hydraulic valve of the second lifting hydraulic cylinder 15 to cause the guide 12 to Lower to such a position.

By these steps S6 and S7, the upper blade 11 and the lower blade in the guide 12 are adjusted to a position where they can be prevented from catching with the steel strip 5 warped in the width direction after notching, and then returned to the original state. Then, it waits for the next notching operation to be performed.
Next, the operation | movement of a notching installation in the continuous annealing line of the steel strip of the above structures, an effect | action, and an effect are demonstrated.

  In this continuous annealing line 10, first, the warpage detector 2 measures the warpage amount X in the width direction W of the steel strip 5 conveyed from the welding machine 6 to the notching equipment 1. The controller 7 determines whether the warp is upward or downward, and determines whether the warp amount X exceeds a certain reference value. Based on the determination, the controller 7 determines whether the first and second lifting hydraulic cylinders. By such position adjusting means, the upper blade 11 or the lower blade in the guide 12 is adjusted to a position where, after notching, it is possible to avoid catching with the steel strip 5 warped in the width direction.

  Then, the position adjustment is performed in stages according to the magnitude of the warp amount X. As a result, even if the warp amount X at the joint of the steel strip 5 fluctuates upward or downward, the steel strip 5 can be used anywhere in the notching equipment 1 including the lower blade and the upper blade 11 in the guide 12. And won't get caught. Therefore, when conveyance of the steel strip 5 is resumed after notching, it can be reliably prevented from breaking on the spot.

As described above, the above-described embodiment is merely an example, and the embodiment of the present invention is not limited thereto. That is, various changes can be made.
For example, in the above embodiment, the case of a continuous annealing line of a cold-rolled steel strip has been described as an example. However, even if a metal strip other than a cold-rolled steel strip or a continuous processing line other than a continuous annealing line is an object, of course, good.

Further, for example, in the above embodiment, the relationship between the warpage amount X and the upward or downward amount of the upper blade 11 or the guide 12 refers to the values in the data table shown in Table 1, but is not limited to this. Instead, a relational expression may be used in which the magnitude of the rising or lowering amount of the upper blade 11 or the guide 12 varies depending on the direction of warpage and the magnitude of the warpage amount X.
Furthermore, in the above-described embodiment, the upper blade 11 or the guide 12 is raised or lowered so as to stop at a desired position in the middle of reaching the ascending limit or descending limit. The first and second elevating hydraulic cylinders 13 and 15 are designed so that the upper blade 11 is always raised or the guide 12 is always lowered to a position where it can be avoided even when the maximum amount of downward warping occurs. For example, it is not necessary to stop in the middle of reaching the ascending limit and descending limit, and the purpose can be achieved by reaching the ascending limit and descending limit.

  In the above embodiment, the case where the position adjusting means such as the first and second lifting hydraulic cylinders 13 and 15 is configured by a hydraulic cylinder has been described as an example. As a motor, in addition to a servo motor that can adjust the position where it stops continuously, other simple motors can be used as long as the rotation direction can be reversed.

  In the above embodiment, the controller 7 controls the position adjusting means, that is, both the first elevating hydraulic cylinder 13 and the second elevating hydraulic cylinder 15. However, the present invention is not limited to this. One of them may be controlled. As a characteristic of the continuous processing line, there may be a case where only warping (+) occurs or only warping (−) occurs, and accordingly, the first lifting hydraulic cylinder 13 is accordingly generated. Of course, the position of only the second lifting hydraulic cylinder 15 may be adjusted. Even in such a case, the position adjusting side may be stopped at a desired position in the middle of reaching the ascending limit or descending limit, or the ascending limit or descending may avoid the maximum amount of warp that can be experienced. The limit may be reached. The side where the position is not adjusted may be fixed without being raised or lowered.

In the above embodiment, the first elevating hydraulic cylinder 13 that raises and lowers the upper blade 11 has been described as having a structure that also functions as a notching function and a position adjusting means, but is not limited thereto. Alternatively, the position may be adjusted with a separate hydraulic cylinder or motor.
Or the following embodiment different from the said embodiment can also be considered. That is, at least one of the upper and lower blades of the notching equipment 1 is made to retreat (position adjustment) to a position where the catching with the steel strip 5 can be avoided by the operation of the traveling hydraulic cylinder 14 after notching. It is an embodiment.

  Next, an example in which the metal band notching method is applied in the metal band continuous processing line of the present invention and a comparative example in which a conventional method is applied will be described. In addition, the used notching equipment 1 is the same as what was demonstrated in the above-mentioned embodiment in both an Example and a comparative example. Further, the arrangement of other equipment (pay-off reel 3, welder 6, bridle roll 4, etc.) is the same, but in the comparative example, the upper blade 11 based on the measurement of the warp amount X of the steel strip 5 in the width direction W. Alternatively, the position of the guide 12 is not adjusted.

FIG. 4 is a graph showing the occurrence rate of catching of the steel strip 5 in each case of the example in which the metal strip notching method is applied in the metal strip continuous processing line of the present invention and the comparative example to which the conventional method is applied. is there.
As shown in the figure, in the comparative example, the steel strip 5 was caught at 10.0% of the total number of notching trials, but in the example, the catch was never generated. From this, it is confirmed that the notching method of the metal strip in the continuous treatment line of the metal strip of the present invention exhibits an excellent effect for preventing the operation of the continuous treatment line of the metal strip from being interrupted. It was done.

It is a schematic block diagram which shows a part of continuous annealing line of the steel strip provided with the notching equipment which concerns on embodiment of this invention. It is a schematic front view of the notching equipment which concerns on embodiment of this invention. It is a flowchart which shows the content of the process in a controller. It is a graph which shows the incidence rate of the catch of a steel strip in each case of an example and a comparative example. It is explanatory drawing explaining the mode of notching. It is a schematic block diagram which shows a part of conventional continuous annealing line of a steel strip. It is a schematic front view of the conventional notching equipment. It is explanatory drawing about the problem of a prior art.

Explanation of symbols

1 Notching equipment 2 Warpage detector (Warpage measurement means)
3 Payoff reel 4 Bridle roll 5 Steel strip (metal strip)
6 Welding machine 7 Controller 10 Continuous annealing line for steel strip (continuous processing line for metal strip)
11 Upper blade 12 Guide and lower blade (guide)
13 First Lifting Hydraulic Cylinder 14 Traveling Hydraulic Cylinder 15 Second Lifting Hydraulic Cylinder

Claims (3)

A metal band notching method in a metal band continuous processing line,
Based on the measurement value of the warping amount measuring means that measures the amount of warpage in the width direction of the steel strip conveyed to the notching equipment through the welding machine, on both the upper and lower blades of the notching equipment, A notching method for a metal band in a continuous processing line for a metal band, wherein the position adjustment is performed after the notching to a position where it is possible to avoid catching with a metal band warped in the width direction.   2. The metal band notching method in the metal band continuous processing line according to claim 1, wherein the position adjustment is performed in accordance with a warp amount in the width direction of the metal band. A metal band continuous processing line, and a warping amount measuring means for measuring a warping amount in a width direction of the metal band conveyed to a notching facility of the metal strip via a welding machine at an entry side of the notching facility ; The position adjusting means for adjusting the position in the metal strip thickness direction for both the upper and lower blades of the notching equipment, and the upper and lower blades of the notching equipment after notching according to the amount of warpage measured by the means for measuring the amount of warpage, A continuous processing line for a metal band, comprising: a controller that outputs a command to the position adjusting means so as to move to a position where it can avoid catching with a metal band warped in the width direction.

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