JP2008212960A - Metal strip passing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress generation of any folding pattern in a payoff reel in a metal strip passing facility using an elastic sleeve for the payoff reel. <P>SOLUTION: A metal strip passing facility comprises a coil outside diameter measuring means for continuously measuring the outside diameter R of a metal strip coil fixed to a payoff reel, a payoff reel expanding force (f) control signal generating means for continuously generating the signal for controlling the payoff reel expanding force so that a process of reducing the payoff reel expanding force (f) as the R measurement value is reduced in a range where no slip occurs between an outer surface of an elastic sleeve and an inner surface of a metal strip coil is provided at least in a part of the entire strip passing process, and a driving force providing means for providing the driving force necessary for generating the payoff reel expanding force based on the signal to the payoff reel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal strip passing device for paying out a metal strip from a payoff reel and winding it with a take-up reel, and in particular, a metal strip passing device having means capable of controlling the expansion force of the payoff reel. About.

  In a metal strip passing device such as a painting line, a metal strip wound in a coil shape (hereinafter referred to as a “metal strip coil”) is mounted on a payoff reel, and the metal is rotated along with the rotation of the payoff reel. The metal strip is withdrawn from the strip coil, and the dispensed metal strip is passed through in a tensioned state. After being subjected to a treatment such as painting in the middle of the pass plate, it is wound with a take-up reel. Taken.

  FIG. 1 schematically illustrates a payoff reel with a metal strip coil mounted thereon. The payoff reel 1 has, for example, a plurality of segments 3 divided around a shaft member 2. A metal strip coil 5 is mounted around the segment 3 via an elastic sleeve 4 made of rubber or the like. As each segment 3 moves away from the rotation axis, the elastic sleeve 4 is expanded, and the metal strip coil 5 is fixed to the payoff reel 1, and between the elastic sleeve 4 and the metal strip coil 5. The frictional force is ensured.

  FIG. 2 schematically illustrates a cross-sectional structure in a cross section including the rotation axis of the payoff reel. The shaft member 2 has a plurality of steps (three steps in the illustrated example). A corresponding taper is also attached to the inside of each segment 3. In this case, when the shaft member 2 is driven in the axial direction indicated by the black arrow, an expansion force is generated in the segment 3 via the tapered portion. This pushing and expanding force corresponds to the payoff reel expanding force f. Driving of the shaft member 2 in the axial direction is realized by providing a hydraulic cylinder 7 having a piston 6 that is operated by hydraulic pressure, for example. In this case, the payoff reel expanding force f is controlled by changing the hydraulic pressure applied to the hydraulic cylinder 7.

  Patent Document 1 discloses a technique for stopping the application of an enlargement force of a payoff reel when the remaining coil length reaches a specific length in a metal strip passing device. This prevents surface flaws caused by misalignment of the plates in the coil in the payoff reel.

JP-A-7-284852

  Unlike the pickling line and annealing line, special consideration is required to prevent surface flaws on the product plate material when passing through metal strips in the process close to final finishing, such as painting lines and slitter lines. It becomes. Therefore, a metal strip coil is mounted on the payoff reel via an elastic sleeve. The elastic sleeve increases the frictional force on the inner surface of the metal strip coil, and sufficient tension can be maintained even when the outer diameter of the coil on the payoff reel decreases along with the threading plate. Surface flaws due to mating are prevented.

  However, when the outer diameter of the coil at the pay-off reel decreases, a “folded pattern” that is substantially parallel to the plate width direction is formed on the metal strip due to the force of expanding to the inner surface of the coil via the elastic sleeve. There is. This folding pattern is particularly likely to occur when the plate thickness is thin, and may extend from several tens of meters to a position exceeding 100 m in some cases. In final products such as coated steel sheets, there is no means for repairing the bent pattern, and depending on the application, the portion where the bent pattern is generated may have to be cut and removed, which greatly affects the yield.

  As in Patent Document 1, when the remaining coil length becomes a certain value or less, the payoff reel expansion force is made zero, especially when the plate thickness is 2 mm or more and the elastic sleeve is not used. This is an effective means for preventing surface flaws due to misalignment. However, when a thin plate having a thickness of, for example, 1 mm or less or 0.6 mm or less is passed using the elastic sleeve, if the payoff reel expansion force is zeroed halfway, between the elastic sleeve and the inner surface of the coil. Since no restraining force is generated and an appropriate tension cannot be maintained, it is impossible to realize a high-precision process such as painting. Therefore, such a method cannot be adopted.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a technique capable of stably and remarkably preventing the occurrence of a folding pattern in a payoff reel in a metal strip passing device using an elastic sleeve for the payoff reel.

  According to the inventors' investigation, it has been found that the “folded pattern” is a kind of plastic deformation caused by excessive payoff reel expansion force. Therefore, in order to suppress the folding pattern, it was considered effective to reduce the payoff reel expanding force when the coil inner diameter is reduced. However, a sudden change in the payoff reel expansion force at a certain point during threading also leads to fluctuations in tension, which may have an adverse effect on the processing such as painting performed in the threading facility, and is therefore always an effective means. It will not be. Even if a means for continuously reducing the payoff reel expansion force as the coil outer diameter decreases is employed, the optimal control pattern is uniform depending on the type of elastic sleeve used, the coil inner diameter, etc. However, implementation in actual operation was not easy.

Therefore, the inventors examined in more detail, the friction coefficient (μ) between the outer surface of the elastic sleeve and the inner surface of the metal strip coil, and the outer diameter of the elastic sleeve is the same value as the inner diameter of the metal coil (r). By grasping the expansion force (F ₂ ) required for expansion, it is found that it is possible to set a control pattern that minimizes the payoff reel expansion force (f). It was. The present invention has been completed based on such findings.

That is, according to the present invention, the reel strip diameter is enlarged to pay out from the payoff reel having a structure for fixing the metal strip coil to the reel via the elastic sleeve, and the metal strip coil fixed to the payoff reel. In a sheet-passage facility (for example, a painting line) equipped with a take-up reel for winding a metal strip,
Coil outer diameter measuring means for continuously measuring the outer diameter R of the metal strip coil fixed to the payoff reel, so that the payoff reel expansion force f approaches a set pattern of f determined in advance as a function of R. , F control signal generating means for continuously generating a signal for controlling f based on the measured value of R, and driving force application for applying to the payoff reel a driving force necessary for generating f based on the signal There is provided a metal strip passing device with means. The set pattern of the pay-off reel expanding force f is a pattern in which f is reduced partially or entirely in a range where no slip occurs between the outer surface of the elastic sleeve and the inner surface of the metal strip coil. Can have.

  It is also possible to automatically control so that the optimum payoff reel expansion force f is given in real time from the data measured during the plate passing operation. In that case, the coil outer diameter measuring means for continuously measuring the outer diameter R of the metal strip coil fixed to the payoff reel in the above-mentioned sheet passing equipment, slip between the outer surface of the elastic sleeve and the inner surface of the metal strip coil. In a range where no R occurs, a signal for controlling f is continuously generated so that at least a part of the entire plate passing process has a process of decreasing the payoff reel expansion force f as the R measurement value decreases. A metal strip passing plate facility including f control signal generating means to be applied and driving force applying means for applying a driving force required to generate f based on the signal to the payoff reel is employed.

More specifically, for example, the coil outer diameter measuring means for continuously measuring the outer diameter R of the metal strip coil fixed to the payoff reel, the tension F _{1 applied} to the dispensed metal strip. It is possible to input the tension measuring means to measure, the inner diameter r of the metal strip coil, the friction coefficient μ between the outer surface of the elastic sleeve and the inner surface of the coil, and the pushing force F ₂ required to expand the outer diameter of the elastic sleeve to r. The process of decreasing the payoff reel expansion force f as the R measurement value decreases within a range that satisfies the following equation (1) based on the values of the input means, R, F ₁ , r, μ, and F _2. In order to have at least a part of the entire plate passing process, f control signal generating means for continuously generating a signal for controlling f, and a driving force necessary for generating f based on the signal to the payoff reel Equipped with driving force application means A metal plate strip is provided.
f> (R / (μ · r)) × F ₁ + F ₂ (1)

  The driving force applying means includes a pump for generating hydraulic pressure, a hydraulic pressure adjusting valve having a mechanism for automatically setting a valve opening based on a signal sent from the f control signal generating means, and a hydraulic pressure adjusted by the valve It can be set as the structure provided with the hydraulic cylinder which a piston act | operates by.

  According to the present invention, it is possible to remarkably suppress the occurrence of a “folded pattern” that occurs near the end of a metal strip on a payoff reel, which has been a problem in the pasting equipment using an elastic sleeve for the payoff reel. It became possible. Therefore, the present invention provides a significant improvement in product quality and yield in a process close to the finishing stage (for example, a painting line), particularly when a thin metal strip is passed through.

  In FIG. 3, the structure of the threading board installation of this invention is illustrated typically. A metal strip coil 5 is mounted on the payoff reel 1 via an elastic sleeve 4. The metal strip 10 paid out from the metal strip coil 5 is passed through the metal strip processing apparatus 11 and taken up by the take-up reel 12. The metal strip processing apparatus 11 is a coating apparatus, for example. In the figure, M is a motor that applies a rotational force to each reel.

  The outer diameter R of the metal strip coil 5 mounted on the payoff reel is continuously measured by the coil outer diameter measuring means 13. “Continuous” means that the data sampling interval is 10 seconds or less. If the sampling frequency is lower than this, it becomes difficult to stably prevent the generation of an excessive payoff reel expansion force that causes a folded pattern. The data sampling interval is more preferably 1 second or less. Of course, an electric signal that directly reflects an analog measurement value may be continuously generated. As this coil outer diameter measuring means 13, for example, a sensor that detects the coil surface position by irradiating a laser beam or a sensor that detects the coil surface position by a contact type can be used.

The R information obtained by the coil outer diameter measuring means 13 is sent to the f control signal generating means 14. The f control signal generating means 14 has a function of converting the above R information into actual data (R value) as necessary. The setting pattern of the payoff reel expansion force f with respect to the R variation can be recorded in the f control signal generation unit 14 in advance. This f setting pattern is a part of a pattern in which the payoff reel expanding force f is partially reduced as the R measurement value decreases in a range where no slip occurs between the outer surface of the elastic sleeve and the inner surface of the metal strip coil. All have and give f as a function of R. Examples of the f setting pattern such as “having part of this pattern” include f in a range where R is sufficiently large or when R becomes below a certain level (for example, when the remaining amount of the coil becomes very small). A setting pattern that keeps the value constant. The functional relationship between R and f is as follows for each condition of the inner diameter r of the metal strip coil, the tension F ₁ applied to the metal strip, and the expansion force F ₂ required to expand the outer diameter of the elastic sleeve to r. It can be determined in advance by experiments. A large number of setting patterns may be recorded. In that case, for example, an operator may select a setting pattern to be applied before feeding and send an instruction from the input unit 15 to the f control signal generation unit 14. By matching the R information from the coil outer diameter measuring means 13 with this f setting pattern, f is calculated in real time.

Further, when the friction coefficient μ between the outer surface of the elastic sleeve and the inner surface of the coil is grasped, the payoff reel expansion force with the decrease in the R measurement value so that f becomes as small as possible within the range satisfying the following expression (1). A pattern of decreasing f can be generated inside the f control signal generating means 14.
f> (R / (μ · r)) × F ₁ + F ₂ (1)
Here, information regarding μ, r, F ₁ , and F ₂ may be input by the operator from the input unit 15 before feeding, for example, and an instruction may be sent to the f control signal generation unit 14. For R, information from the coil outer diameter measuring means 13 is used in real time. However, it is necessary to appropriately reflect the point “so that f is as small as possible” in the setting pattern. As the method, for example, in consideration of a change in conditions in actual operation, an allowance α for preventing slippage between the outer surface of the elastic sleeve and the inner surface of the metal strip coil is set, and the following (2 It is possible to adopt a program in which f is calculated in real time according to the function of the formula (1).
f = (R / (μ · r)) × F ₁ + F ₂ + α (2)

  Inside the f control signal generation means 14, a control signal (f control signal) corresponding to the value of the payoff reel expansion force f determined as described above is continuously generated. “Continuously” means that the generation interval of the f control signal is 10 seconds or less. When the generation frequency is less than this, it is difficult to stably prevent the generation of an excessive payoff reel expansion force that causes a folded pattern when the signal is used to control the payoff reel expansion force f in real time. . More preferably, the generation interval is 1 second or less. The form of the f control signal is selected so that f can be continuously controlled by the driving force applying means 16 described later. For example, when f is controlled by changing the opening degree of the valve by the driving force applying means 16, a signal for setting the valve opening degree is generated as the f control signal. In addition, after calculating the value of f once from each said parameter, the f value may be converted into an f control signal, or the program which produces | generates an f control signal directly from the said parameter may be used.

  The signal generated by the f control signal generating unit 14 is sent to the driving force applying unit 16. The driving force applying means 16 is a means for applying a driving force for generating a payoff reel expanding force f. An example of the configuration is schematically shown in FIG. In this case, a hydraulic pressure adjustment having a mechanism for automatically setting the valve opening based on a pump P that generates hydraulic pressure using hydraulic oil stored in the oil tank 20 and a signal sent from the f control signal generating means. The valve 21 and the hydraulic cylinder 7 in which the piston 6 is operated by the hydraulic pressure adjusted by the valve 21 can be provided.

FIG. 5 schematically shows the configuration of the sheet passing equipment when the tension F _{1 applied} to the dispensed metal strip is measured by the tension measuring means 30 and the measured value is used for controlling f in real time. Illustratively. As the tension measuring means 30, for example, a sensor (such as a load cell) that can measure a load from a metal strip applied to a roll provided in the middle of the plate passing process can be used. Information about the tension F ₁ obtained by the tension measuring means 30 is sent to the f control signal generating means 14. f control signal generating means 14 has a function of converting as needed on the above F ₁ to the actual data (value of F _1).

In this case, since the measurement results of the coil outer diameter R and the tension F ₁ measured in real time are used to generate the f control signal, the f is as small as possible within the range satisfying the expression (1). When generating the pattern in which the payoff reel expansion force f is decreased in accordance with the decrease of the R measurement value inside the f control signal generation means 14, only information on μ, r, and F ₂ is input from the input means 15. It becomes a target. In this case, for example, it is possible to employ a program in which f is calculated in real time according to the function of equation (2). Since the actual measurement value is also reflected in the information related to the tension F _1, f-control with higher accuracy than in the case of FIG. 3 can be expected.

The coil outside diameter measuring means 13, the f control signal generating means 14, the input means 15, and the tension measuring means 30 were attached to the existing slitter line, and the threading board equipment of the present invention having the configuration shown in FIG. 5 was constructed. The driving force applying means 16 has the configuration shown in FIG. That is, by adjusting the valve opening, the hydraulic pressure is changed to change the payoff reel expanding force. The payoff reel expanding force f is a mechanism that is generated by pushing and expanding four segments by the method shown in FIG. The coil outer diameter measuring means 13 uses a type of sensor that irradiates a laser beam to grasp the position of the coil surface, so that the position of the coil surface can be measured continuously throughout the plate. The tension measuring means 30 attaches a load sensor to the roll on the payoff reel side, and continuously measures the load applied from the steel plate in the through plate. These measurement data for R and F ₁ are sent to a performance data calculator built in the f control signal generation means 14 and converted into a value of the coil outer diameter R and a value of the tension F ₁ , respectively. From the input means 15, the operator inputs the inner diameter r of the metal strip coil, the friction coefficient μ between the outer surface of the elastic sleeve and the inner surface of the coil, and the expansion force F ₂ required to expand the outer diameter of the elastic sleeve to r before passing. It is supposed to be. From these parameters, the value of f is calculated in real time by the above-mentioned equation (2), and the f control signal for instructing the valve opening for realizing the value of f is continuously in an interval of 1 second or less. Is generated.

Further, in this plate passing equipment, the f control is performed in real time from the R value measured so as to approach the f setting pattern recorded in the f control signal generation means 14 in advance without using the measured F ₁ data. It is also possible to switch to a mode in which signals are generated continuously. In this case, the operator inputs information on F ₁ from the input means 15.

Ten normal steel cold-rolled annealed steel sheet coils manufactured under the same conditions were prepared as metal strip coils. Each of the ten coils has a plate thickness of 0.5 mm, a plate width of 914 mm, a coil inner diameter (r) of 508 mm, and an initial coil outer diameter of 1200 mm. The elastic sleeve 4 is made of rubber, has an initial wall thickness of about 38 mm, an initial outer diameter of about 432 mm, and the expansion force F ₂ required to expand the outer diameter to 508 mm can be determined in advance by measurement. Yes.

A plate passing experiment was conducted using the above plate passing facility (no slit work was performed).
For three of the ten coils, f control signals are generated based on the measured value of R so that the payoff reel expansion force f approaches the f setting pattern determined in advance as a function of R during feeding. The plate passing experiment was conducted in the mode. The f setting pattern is a pattern in which f is decreased as R decreases within a range in which no slip occurs between the outer surface of the elastic sleeve and the inner surface of the metal strip coil, and is specifically shown in FIG. The pattern was adopted. This pattern was obtained by a preliminary experiment with reference to the equation (1). In this case, the initial hydraulic pressure (pressure applied to the cylinder 7) when the coil diameter R is 1200 mm is 18 kg / cm ² , and then the pressure is reduced as R decreases. 5 kg / cm ² necessary for expanding the outer diameter of the material to 508 mm.

Further, a plate passing experiment was performed on the two coils in a mode in which the value of f was calculated using the data of R and F ₁ measured by the above-described equation (2). Here, the margin α in the equation (2) is programmed so that a value of 5% is set with respect to the value of “(R / (μ · r)) × F ₁ + F ₂ ”.
The above five are examples of the present invention, and the condition settings were made by slightly changing the target values of the line speed and the tension F ₁ .

For the remaining five coils, for the purpose of comparison, only the function provided in the existing slitter line was used (ie, using the conventional threading equipment), and the payoff reel expansion force was made constant throughout the threading. The plate was passed in the state. Specifically, the initial hydraulic pressure (pressure applied to the cylinder 7) 18 kg / cm ² was maintained until the end. The plate passing conditions in these five coils were the same as those in the five coils of the present invention except that the payoff reel expansion force f was controlled. That is, in the present invention example and the comparative example, five pairs having the same sheet feeding conditions are established. These five sets are represented by symbols A to E.

  Observe the occurrence of “folded pattern” on the pay-off reel with respect to the steel plate in the passing plate. The length from the position where the “folded pattern” was observed for the first time to the end of the steel plate was defined as the “folded pattern occurrence length”. Recorded. The results are shown in FIG.

As can be seen from FIG. 7, in the comparative example, a folding pattern occurred over a length of several tens of meters or more. On the other hand, in the example of the present invention, the occurrence of the folding pattern was suppressed to about 2 to 3 m at the end, and a remarkable improvement effect was recognized. In particular, the examples of the present invention with symbols C and E were passed in a mode in which the value of f was calculated using the measured data of R and F ₁ , but the folding pattern was not observed and was more stable. It was found that the folding pattern can be prevented.

The figure which illustrated typically the payoff reel of the state by which the metal strip coil was mounted | worn. The figure which illustrated typically the cross-section in the cross section containing the rotating shaft of a payoff reel. The figure which illustrated typically the composition of the board installation of the present invention. The figure which showed typically an example of the structure of the driving force provision means. The figure which illustrated typically the composition of the board installation of the present invention. The graph which showed f setting pattern used by example A, B, and D of this invention. The graph which showed the bending pattern generation | occurrence | production length of the example of this invention and the comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Payoff reel 2 Shaft member 3 Segment 4 Metal strip coil 6 Piston 7 Hydraulic cylinder 10 Metal strip 11 Metal strip processing apparatus 12 Take-up reel 13 Coil outer diameter measuring means 14 f Control signal generating means 15 Input means 16 Driving force Giving means 20 Oil tank 21 Hydraulic adjustment valve 30 Tension measuring means

Claims (6)

A payoff reel having a structure for fixing a metal strip coil to the reel through an elastic sleeve by enlarging the reel diameter, and a metal strip fed out from the metal strip coil fixed to the payoff reel In threading equipment equipped with a take-up reel for winding,
Coil outer diameter measuring means for continuously measuring the outer diameter R of the metal strip coil fixed to the payoff reel, so that the payoff reel expansion force f approaches a set pattern of f determined in advance as a function of R. , F control signal generating means for continuously generating a signal for controlling f based on the measured value of R, and driving force application for applying to the payoff reel a driving force necessary for generating f based on the signal Metal strip passing plate equipment with means.   The set pattern of the pay-off reel expanding force f is a pattern in which f is reduced partially or entirely as R decreases in a range in which no slip occurs between the outer surface of the elastic sleeve and the inner surface of the metal strip coil. The metal strip passing plate facility according to claim 1, which is provided. A payoff reel having a structure for fixing a metal strip coil to the reel through an elastic sleeve by enlarging the reel diameter, and a metal strip fed out from the metal strip coil fixed to the payoff reel In threading equipment equipped with a take-up reel for winding,
Coil outer diameter measuring means for continuously measuring the outer diameter R of the metal strip coil fixed to the payoff reel, the R measurement value within a range where no slip occurs between the outer surface of the elastic sleeve and the inner surface of the metal strip coil. F control signal generating means for continuously generating a signal for controlling f so that at least a part of the entire sheet passing process has a process of decreasing the payoff reel expanding force f with the decrease of The metal strip passing plate equipment provided with driving force applying means for applying to the payoff reel a driving force necessary to generate f based on the above. A payoff reel having a structure for fixing a metal strip coil to the reel through an elastic sleeve by enlarging the reel diameter, and a metal strip fed out from the metal strip coil fixed to the payoff reel In threading equipment equipped with a take-up reel for winding,
Coil outer diameter measuring means for continuously measuring the outer diameter R of the metal strip coil fixed to the payoff reel, tension measuring means for measuring the tension F _{1 applied} to the discharged metal strip, and metal strip Input means capable of inputting the inner diameter r of the plate coil, the coefficient of friction μ between the outer surface of the elastic sleeve and the inner surface of the coil, and the expansion force F ₂ required to expand the outer diameter of the elastic sleeve to r, R, F ₁ The process of decreasing the payoff reel expansion force f as the R measurement value decreases within a range that satisfies the following equation (1) based on the values of r, r, μ, and F ₂ is at least one of the full threading processes. And a driving force applying unit that applies a driving force necessary to generate f based on the signal to the payoff reel. Metal strip strip passing equipment.
f> (R / (μ · r)) × F ₁ + F ₂ (1)   The driving force applying means includes a pump for generating hydraulic pressure, a hydraulic pressure adjusting valve having a mechanism for automatically setting a valve opening based on a signal sent from the f control signal generating means, and a hydraulic pressure adjusted by the valve. 5. A metal strip passing device according to any one of claims 1 to 4, further comprising a hydraulic cylinder on which a piston operates.   The said plate passing equipment is a coating line, The metal strip passing plate equipment in any one of Claims 1-5.

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