JP2009119475A - Method of monitoring variation amount of plate width in continuous plating line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the plate width of a steel sheet definite by controlling tension in a furnace and elongation percentage in a tension leveler on the basis of the amount of shrinkage obtained by measuring the plate width on the inlet side and the outlet side. <P>SOLUTION: The method of monitoring the variation of the plate width in a continuous plating line is a method in which the width control is performed by inputting the amount (30) of the shrinkage obtained by performing the subtraction of the inlet-side plate width (20a) from an inlet-side width meter (20) and the outlet-side plate width (12a) from an outlet-side width meter (11) to a line controller (13) and changing the tension in the furnace and the elongation percentage condition of the tension leveler (9) on the basis of the shrinkage amount (30). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for monitoring a change in plate width of a continuous plating line, and in particular, subtracts an exit side plate width obtained by an exit side plate width meter from an entrance side plate width obtained by an entrance side plate width meter provided on the entrance side. It is related with the novel improvement for measuring reduction of the width | variety short of a steel plate using the amount of shrinkage obtained in this way.

  As a method for monitoring the amount of change in the width of a continuous plating line of this type that has been used in the past, the patent application is not disclosed because the patent application and the external announcement are not particularly performed by in-house production, The configuration of in-house production can be shown in FIG.

  What is indicated by reference numeral 1 in FIG. 2 is a steel plate as a product supplied from the entry side 2 to the annealing furnace 6 through the rolls 3 and 4 and the annealing furnace entry side roll 5 in the continuous plating line 1A. 1 is a skin pass mill 8 for performing known high pressure temper rolling from an annealing furnace exit side roll 7 on the exit side 10 of the annealing furnace 6 and a tension leveler 9 for changing elongation rate conditions. The product board width of the delivery side 10 is measured by the delivery side plate width meter 11.

The product plate width 11a on the exit side 10 from the exit side plate width meter 11 is input to the exit side plate width meter control unit 12, so that the operator can obtain the product plate width 11a from the output side plate width meter control unit 12. It is configured.
Further, a line controller 13 for controlling the continuous plating line 1A by automatic / manual switching is provided. The line controller 13 controls the tension of the annealing furnace entry side roll 5 by an annealing furnace entry side roll control signal 13a. The tension control of the annealing furnace exit side roll 7 is performed by the annealing furnace exit side roll control signal 13b, and the tension control of the tension leveler 9, the annealing furnace temperature control 13d, and the line speed control 13e are performed by the elongation rate condition change signal 13c. It is configured to be able to.

  In the above-described configuration, when the steel plate 1 is transported from the entry side 2, the steel plate 1 is annealed in the annealing furnace 6 and then transported to the exit side 10 under preset tension control. Although it is conveyed to a plating tank (not shown), the product plate width 11a detected by the exit side width meter 11 on the exit side 10 is calculated by the exit side plate width meter control unit 12, and the calculation result is sent to the operator. Be notified.

  Based on the calculation result, the operator manually operates the line controller 13 to control the elongation rate of the tension leveler 9 and the in-furnace tension of the annealing furnace 6, thereby obtaining an error in product plate width. I tried to prevent quality degradation due to.

Since the conventional method for monitoring the amount of change in the plate width of the continuous plating line is configured as described above, the following problems exist.
In other words, the steel sheet transported by the continuous plating line can only measure the coil tip and rear end at the entry side section, and the continuous measurement is based only on the exit sheet width meter of the exit section and based on the product sheet width. Since the operator is a method of operating the line controller, the product, that is, the amount of shrinkage in the entire coil length and the original sheet width sheet cannot be quantified, and high-precision sheet width control is impossible.

  The method of monitoring the amount of change in the width of the continuous plating line according to the present invention is a method of monitoring the steel sheet continuously conveyed from the inlet side on the continuous plating line, sending it to the outlet side after annealing in an annealing furnace, and using the outlet side width meter on the outlet side. In the method for monitoring the amount of change in the plate width of the continuous plating line so as to measure the product plate width of the steel plate, an inlet side plate width meter and a pulse generator are provided on the upstream side of the annealing furnace, and the measurement was performed with the inlet side plate width meter. The measurement position of the steel plate is tracked with a measurement signal from the pulse generator, and when the measurement position reaches the position of the delivery side plate width meter, the delivery side plate width is measured by the delivery side plate width meter, and the delivery side plate width is calculated. Using the contraction amount of the product plate width obtained by subtracting the exit side plate width from the entrance side plate width by transmitting to the entrance side plate width meter control unit connected to the entrance side plate width meter, the continuous plating line Lay provided Furnace tension control in the continuous plating line by a controller, a method for performing elongation control, also a process of displaying on the digital display device connected to the entering side plate width controlling section of the contraction amount.

Since the plate width variation monitoring method of the continuous plating line according to the present invention is configured as described above, the following effects can be obtained.
That is, plate width meters are provided on the entrance side and the exit side of the continuous plating line, and the shrinkage amount is obtained by subtracting the exit side plate width from the entrance side plate width. Control of changing the tension and tension level elongation rate conditions is performed, and control for always keeping the product plate width constant is performed, thereby stabilizing the product quality.

  The present invention reduces the steel sheet width short-circuit using the amount of shrinkage obtained by subtracting the exit side plate width obtained with the exit side plate width meter from the entry side plate width obtained with the entry side plate width meter provided on the entry side. An object of the present invention is to provide a method for monitoring the amount of change in the width of a continuous plating line so as to measure the thickness.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a method for monitoring a change in plate width of a continuous plating line according to the invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, what is shown by the code | symbol 1 is a product supplied to the annealing furnace 6 from the entrance side 2 in the continuous plating line 1A via the rolls 3 and 4, the entrance side plate width meter 20, and the annealing furnace entrance side roll 5. This steel plate 1 is a skin pass mill 8 for performing well-known high-pressure temper rolling from the annealing furnace outlet-side roll 7 on the outlet side 10 of the annealing furnace 6 and a tension leveler for changing the elongation condition. 9, the product plate width 11 a on the exit side 10 is measured by the exit side plate width meter 11 on the exit side 10.

The product plate width 11a of the exit side 10 from the exit side plate width meter 11 is input to the exit side plate width meter control unit 12, and the measured value of the exit side plate width meter 12a from the exit side plate width meter control unit 12 is the input side plate width. Input to the meter control unit 21.
The measured value of the entry side plate width meter 20a from the entry side plate width meter 20 is input to the entry side plate width meter control unit 21. The entry side plate width meter control unit 21 calculates the exit side plate width 12a from the entry side plate width meter 20a. A subtraction operation is performed, and the contraction amount 30 is displayed on the digital display 22.

  The shrinkage amount 30 is supplied to the line controller 13 from the entry-side plate width meter control unit 21, and in this line controller 13, the annealing furnace entrance-side roll 5 and the annealing furnace of the annealing furnace 6 based on the shrinkage amount 30. By controlling the tension of the exit roll 7 with the annealing furnace entry / exit roll control signals 13a, 13b, the in-furnace tension in the annealing furnace 6 is controlled, and the shrinkage amount 30 is set to an appropriate value. ing. In addition to the control described above, the furnace temperature (annealing furnace temperature control 13d) and the line speed (line speed control 13e) can also be performed.

  The annealing furnace entry-side roll 5 is provided with, for example, a pulse generator 31 composed of a rotation detector such as an encoder or a resolver, and a measurement signal 32 for tracking output from the pulse generator 31 is supplied to the entry-side plate width meter. 20 is configured to be supplied.

Next, a case where the amount of change in the product plate width 11a in the continuous plating line 1A in the above-described configuration is monitored will be described.
First, in the configuration of FIG. 1, the measurement position of the steel plate 1 measured by the entry side width meter is tracked by the measurement signal 32 from the pulse generator 31 (that is, the length of the steel plate 1 being conveyed is determined by the pulse generator 31). The measurement position can be specified by the measurement signal 32 that is the number of pulses of the input side plate width meter 20). Is done.

  When the measurement position of the steel sheet 1 reaches the position of the delivery side plate width meter 11 through the annealing furnace 6 and the like, the product plate width 11a on the delivery side 10 is processed by the delivery side plate width meter control unit 12. It is transmitted to the entry side plate width meter controller 21 and inputted.

In the entrance side plate width meter control unit 21, the entrance side plate width 20 a and the exit side plate width 12 a are compared and subtracted (ingress side plate width 20 a -exit side plate width 12 a), and the obtained shrinkage amount 30 is transferred to the line controller 13. It is input and displayed on the digital display 22.
In the line controller 13, as described above, the annealing furnace entry-side roll is calculated based on the annealing furnace entry / exit-side roll control signals 13a and 13b and the elongation rate condition change signal 13c which are calculated and output based on the shrinkage amount 30. 5 and the axial position of the annealing furnace outlet roll 7 and the tension of the tension leveler 9 are moved by a known moving means (not shown), so that the in-furnace tension of the steel sheet 1 in the annealing furnace 6 is controlled and contracted. A quantity of 30 is controlled.

  The control of the shrinkage amount 30 in the above-described continuous plating line 1A is either real-time continuous control or intermittent control at predetermined time intervals so that the allowable shrinkage amount 30 preset in the line controller 13 is obtained. It has been adopted.

It is a block diagram which shows the board width variation | change_quantity monitoring method of the continuous plating line by this invention. It is a block diagram which shows the board | plate width change amount monitoring method of the conventional continuous plating line.

Explanation of symbols

1 Steel plate (product)
2 entrance side 3, 4 roll 1A continuous plating line 5 annealing furnace entrance side roll 6 annealing furnace 7 annealing furnace exit side roll 8 skin pass mill 9 tension leveler 10 exit side 11 exit side plate width meter 11a product plate width 12 exit side plate width meter control Part 12a Exit side plate width 13 Line controller 13a Annealing furnace entrance side roll control signal 13b Annealing furnace exit side roll control signal 13c Elongation rate condition change signal 20 Entrance side plate width meter 20a Entrance side plate width 21 Entrance side plate width meter control unit 22 Digital display 30 Shrinkage 31 Pulse generator 32 Measurement signal

Claims (2)

The steel plate (1) continuously conveyed from the entry side (2) on the continuous plating line (1A) is sent to the exit side (10) after annealing in the annealing furnace (6), and the exit plate of the exit side (10). In the method of monitoring the amount of change in the width of the continuous plating line in which the product plate width (11a) of the steel plate (1) is measured with a width meter (11),
An inlet side plate width meter (20) and a pulse generator (31) are provided upstream of the annealing furnace (6), and the measurement position of the steel plate (1) measured by the inlet side plate width meter (20) is the pulse generator ( 31) tracking with the measurement signal (32), and when the measurement position reaches the position of the exit plate width meter (11), measure the exit plate width (12a) with the exit plate width meter (11). The exit side plate width (12a) is transmitted to the entrance side plate width meter controller (21) connected to the entrance side plate width meter (20) to subtract the exit side plate width (12a) from the entry side plate width (20a). Using the shrinkage amount (30) of the product plate width (11a) obtained by the above, the in-furnace tension in the continuous plating line (1A) by the line controller (13) provided in the continuous plating line (1A) A method for monitoring the amount of change in the width of a continuous plating line, characterized by performing control and elongation rate control.   2. The plate width change amount monitoring method for a continuous plating line according to claim 1, wherein the shrinkage amount (30) is displayed on a digital display (22) connected to the entry side plate width meter controller (21). .

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