JP3684786B2 - Steel sheet winder tension fluctuation suppression device - Google Patents

Description

本発明の張力変動および板厚偏差の結果を図３に、また従来例のそれを図４に示した。
【００２６】
【発明の効果】
以上の説明から明らかなように、本発明によれば、応答性の低いモータでも張力変動が抑制でき、特にコイル径が小さく圧延速度の高い部分で顕著であった張力変動を抑止できるという効果を奏する。しかも、構造が簡単で且つ応答性の高い張力変動抑止装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の巻取機の張力変動抑止装置の一実施形態を示す模式図である。
【図２】本発明の巻取機の張力変動抑止装置の他の実施形態を示す模式図である。
【図３】本発明の巻取機の張力変動抑止装置による張力変動及び板厚偏差の一例を示すグラフである。
【図４】従来の巻取機の張力変動抑止装置による張力変動及び板厚偏差の一例を示すグラフである。
【図５】従来の巻取機の張力変動抑止装置の一例を示す模式図である。
【図６】図５に示したものの部分拡大図である。
【符号の説明】
３ 巻取機
５ コイル径検出器
１０ 張力変動抑止装置
１１ 架台
１２ コイル倣いロール
１３ 押し付けロール
１４ 付勢手段（ばね機構）
２０ 張力変動抑止装置
２１ 付勢手段（シリンダ）
２２ ギャップ制御装置
２３ シリンダ制御装置
Ｗ ワーク
Ｃ コイル
Ｓ サーボ機構[0001]
BACKGROUND OF THE INVENTION
In the present invention, when rolling a steel sheet, the step at the coil tip wound around the winder causes a slight variation in the coil diameter, resulting in fluctuations in the winding tension. The present invention relates to a tension fluctuation suppression device for a steel sheet winder for preventing the phenomenon of occurrence.
[0002]
[Prior art]
Conventionally, cold-rolled steel sheet products have been obtained by cold rolling hot-rolled steel sheets, but small diameter workpieces such as Sendzimir mills are required for rolling high-definition resistance products such as stainless steel with high efficiency and high accuracy. Multiple rolling mills with rolls are advantageous. In general, as shown in FIG. 5, a material to be rolled (hereinafter referred to as a workpiece) W is repeatedly rolled reversibly to a predetermined thickness by reverse rolling with a single-stand multiple rolling mill 2. Before and after the rolling mill 2, tension reels (winding machines) 3 that strongly apply a tension to the workpiece W are installed, and the winding machines 3 and 3 are alternately driven by a motor 4 provided therein. In the reverse rolling, the thickness of the work W is controlled by adjusting the work roll gap of the rolling mill 2 and adjusting the tension of the winder 3.
[0003]
Therefore, when the work W is wound by the winder 3, a step D as shown in FIG. 6 is generated between the tip of the coil wound on the output tension reel and the reel surface. Since the steel plates are wound on the step D several times, the step portion protrudes outward, and the coil outer diameter of the step portion becomes larger than the portion without the step D. That is, the coil diameter slightly fluctuates due to the rotation of the winder 3. The variation in the coil diameter due to the step portion causes the variation in the coil peripheral speed and the variation in the rolling tension, and this variation in the tension becomes a factor of reducing the plate thickness accuracy.
[0004]
In order to suppress the plate thickness fluctuation resulting from the fluctuation of the coil diameter based on the step at the coil tip, the introduction of a coil diameter fluctuation compensation function has been proposed. In this device, a change in coil diameter is detected by a gap sensor, which is a coil diameter detector, and constant coil peripheral speed control is performed by tracking in the coil circumferential direction. That is, the step amount information of the step portion and the winding position information of the step portion detected by the gap sensor 5 are taken into the coil diameter fluctuation compensating device 6 which is a constant peripheral speed control device, and a command is given to the current control device 7 to give the command By controlling the rotation of the electric motor 4 so that the coil peripheral speed is constant (see FIG. 5), fluctuations in tension due to changes in the coil diameter are suppressed, and the plate thickness accuracy is improved.
[0005]
[Problems to be solved by the invention]
However, even if the conventional coil diameter fluctuation compensation function is introduced, there are the following problems.
[0006]
(1) Tension fluctuations caused by the coil step portion become more pronounced as the coil peripheral speed increases. This is because the step amount of the step portion is detected by the gap sensor 5, and then the control amount of the constant peripheral speed control is calculated by the coil diameter fluctuation compensating device 6, and a command is issued to the current control device 7 based on the calculation result. This is because there is a delay in a series of control systems until the current control device 7 reacts in order to control the rotation speed of the electric motor 4. That is, as the coil peripheral speed increases, the influence of the response delay of the control system increases.
[0007]
(2) Further, the tension variation increases as the step ratio at the coil tip (the ratio of the step amount to the coil diameter) increases. In other words, even if the plate thickness is the same, the smaller the coil diameter, the greater the change in the coil diameter and the greater the variation in tension. This is because a larger change in the coil diameter causes excessive tension fluctuations. As a result, the smaller the coil diameter, the more significant the fluctuations in the plate thickness. Accordingly, when the coil diameter is small even at the same speed, the coil peripheral speed increases and the delay of the control system also increases.
[0008]
In order to suppress this, it is conceivable that rolling is performed at a low speed within a range in which the control system can respond without delay, but in this case, deterioration of productivity is unavoidable.
Therefore, the present invention has been made in order to solve such a conventional problem, and even a motor with low responsiveness can suppress fluctuations in tension due to a coil step portion, and is particularly remarkable in a portion where the coil diameter is small and the rolling speed is high. An object of the present invention is to provide a simple and highly responsive tension fluctuation suppressing device for a steel sheet winder that can effectively suppress tension fluctuation.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a device that suppresses fluctuations in tension due to a change in the diameter of a steel sheet coil wound around a winder during rolling, and is in contact with the coil being wound. In addition, a copying roll that follows the coil diameter, a pressing roll that applies tension to the steel plate alongside the mount on which the copying roll is attached, and a biasing unit that biases the mounting toward the coil. Yes.
[0010]
The invention according to claim 2 is a device that suppresses tension fluctuation due to a change in the diameter of a steel sheet coil wound around a winder during rolling, and changes the coil diameter in the vicinity of the coil being wound. A coil diameter detector to be detected; a pressing roll that applies tension to the steel plate in addition to the base on which the coil diameter detector is attached; and the position of the base to make the output of the coil diameter detector constant And a servo mechanism for controlling the coil with a cylinder.
[0011]
In the invention according to claim 1, when the copying roll that is pressed by the biasing means and is in contact with the outer surface of the coil being wound moves according to the change in the coil diameter (of the stepped portion), The gantry moves integrally with the copying roll against the urging force of the urging means. Therefore, the pressing roll provided alongside the gantry moves at the same time in a direction that compensates for a variation in tension due to a change in the coil diameter of the stepped portion. As a result, fluctuations in tension due to changes in the coil diameter of the stepped portion are suppressed, and as a result, high plate thickness accuracy is ensured.
[0012]
In the invention according to claim 2, the coil diameter detector detects a change in the coil diameter (a change in the gap) (a change in the gap) and operates the cylinder by a servo mechanism so that the gap is always constant. Let Thereby, the position of the gantry on which the pressing roll is mounted together with the coil diameter detector is always kept constant with respect to the coil diameter. That is, the pressing roll automatically follows in response to fluctuations in the coil diameter of the stepped portion, and the tension of the steel plate is kept constant. Thus, high plate thickness accuracy is ensured.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an embodiment of a tension fluctuation restraining device for a winder in rolling steel sheets. In addition, the same code | symbol is attached | subjected to the same location as the said prior art example, and detailed description is abbreviate | omitted. In FIG. 1, the tension fluctuation suppressing device 10 of the winder 3 includes a coil copying roll 12 and a support roll 13 as a pressing roll, which are mounted on the same base 11 at intervals, and the base 11 is arranged in the direction of the coil C. And a spring mechanism 14 as an urging means for urging the lens.
[0014]
The coil copying roll 12 is pressed by the elastic force of the spring 14 a of the spring mechanism 14 and moves according to the coil diameter while contacting the coil C being wound by the winder 3.
[0015]
The support roll 13 is pressed by the elastic force of the spring 14 a together with the coil copying roll 12, and the coil is integrally formed with the coil copying roll 12 while being in contact with the workpiece W just before being wound around the coil C and applying tension. Move along the diameter.
[0016]
In FIG. 1, the tension fluctuation suppressing device 10 is shown only in one (left) winder 3, but in the case of reverse rolling, the tension is similarly applied to the other (right) winder 3. It is assumed that the fluctuation suppressing device 10 is installed and operated alternately according to the rolling direction.
[0017]
Now, the operation will be described on the assumption that the illustrated tension fluctuation suppressing device 10 is on the exit side of the rolling mill 2. When the tip of the workpiece W fed into the winder 3 goes around the tension reel while being wound around the tension reel and the workpiece W is wound on the tip portion, a step portion is generated and the coil outer diameter of the portion is localized. Change (increase). Almost simultaneously, the step portion passes through the coil copying roll 12 of the tension fluctuation suppressing device 10. At this time, since the coil scanning roll 12 in contact with the outer diameter of the workpiece W moves back together with the mount 11 against the elastic force of the spring 14a by an amount corresponding to the increase in the diameter of the stepped portion, the support roll 13 on the mount 11 also moves back simultaneously. To do. The backward movement of the support roll 13 is a direction in which the tension of the workpiece W being wound around the coil C is weakened. Here, assuming a state in which the tension fluctuation suppressing device 10 is not installed, the increase in the diameter of the stepped portion results in an increase in the peripheral speed corresponding to the increased coil diameter in the stepped portion, and according to the increase in the peripheral speed. As a result, the tension of the workpiece W increases. That is, when the workpiece W is wound around the step portion, a minute coil diameter variation corresponding to the amount of the step is generated, and an instantaneous variation of the rolling tension should be brought about. However, the installation of the tension fluctuation suppression device 10 allows the coil copying roll 12 to instantly catch the coil diameter fluctuation at the stepped portion, and at the same time, the support roll 13 compensates for the tension fluctuation due to the coil diameter fluctuation. It is possible to suppress the fluctuation of the tension by actuating. In this case, the tension fluctuation suppression operation is performed regardless of the coil peripheral speed. In other words, regardless of whether the electric motor 4 of the winder 3 is a motor with high responsiveness or a motor with low responsiveness, it is reliably performed without delay by a simple mechanical mechanism.
[0018]
Thus, according to the present embodiment, the top mark at the coil front end (or rear end) is also suppressed, and there is no need to lower the coil peripheral speed for improving the response, so there is no risk of deterioration in productivity. Further, it is possible to suppress the fluctuation in tension, which is remarkable at a portion where the coil diameter is small and the rolling speed is high, easily and with high responsiveness, and as a result, it is possible to produce a steel plate product having a stable plate thickness.
[0019]
In the above embodiment, the case where the spring mechanism 14 using the elastic force of the spring 14a is used as the urging means of the gantry 11 in the tension fluctuation suppressing device 10 is not limited to this. A pressure cylinder or a pneumatic cylinder can also be used.
[0020]
FIG. 2 shows another embodiment of the tension fluctuation suppressing device of the present invention.
In this embodiment, the tension fluctuation suppressing device 20 uses a gap sensor 5 that is a coil diameter detector instead of the coil copying roll 12, and adopts a cylinder 21 instead of a spring mechanism 14 as an urging means. The servo mechanism S is configured to control the position of the gantry 11 by the cylinder 21 so that the output of the sensor 5 is constant, which is different from the first embodiment.
[0021]
The servo mechanism S is configured to follow an arbitrary change in the gap (gap) between the gap sensor 5 and the coil C, which is a target value, using the position of the gantry 11 with respect to the coil C as a control amount. In the illustrated case, the gap sensor 5 detects the size of the gap, and sends an electrical signal output in proportion to the size of the gap to the gap control device 22, where the gap detection value and the preset value are set in advance. The direction and flow rate of the working fluid supplied from a pressure source (not shown) of the cylinder 21 that is an actuator are controlled by comparing the gap target value with each other and outputting a signal that compensates for the deviation to the cylinder controller 23. Thus, the position of the gantry 11 with respect to the outer diameter of the coil is controlled so as to always be kept constant.
[0022]
Specifically, for example, an electro-hydraulic servo mechanism can be suitably used. A hydraulic cylinder is used as the cylinder 21 which is an actuator. In the case of the analog type, the analog type gap sensor 5 is adopted, the gap control device 22 is configured by a comparator, a servo amplifier, and the like, and the cylinder control device 23 is configured by a control valve such as a servo valve or a proportional valve. be able to. In the case of a digital system, the gap control device 22 for processing the signal of the gap sensor 5 is composed of a minicomputer, a D / A converter, a transistor amplifier, and the like, and the cylinder control device 23 is a pulse motor or an on / off valve. The control valve can be configured.
[0023]
In the second embodiment, the gap sensor 5 measures the gap with the coil C and instructs the cylinder 21 as an actuator so that the gap is always constant. At this position, the gantry 11 is pushed down and retracts. Thereby, the support roll 13 installed on the mount 11 is also retracted. Thus, an increase in tension at the step portion can be suppressed, and fluctuations in tension can be reduced. Therefore, the same effect as that of the first embodiment can be obtained by the second embodiment.
[0024]
(Example)
In order to ascertain the effects of the present invention, a comparative test was conducted between the case where the tension fluctuation suppressing device of the present invention was used and the case where the conventional tension fluctuation suppressing device was used.
[0025]
As a conventional tension fluctuation suppressing device, the one shown in FIG. 5 was used. On the other hand, as the tension fluctuation suppressing device of the present invention, the one shown in FIG. 2 was used.

FIG. 3 shows the results of tension fluctuation and thickness deviation of the present invention, and FIG. 4 shows the conventional example.
[0026]
【The invention's effect】
As is apparent from the above description, according to the present invention, even when the motor has low responsiveness, it is possible to suppress the tension fluctuation, and in particular, it is possible to suppress the tension fluctuation that is remarkable in the portion where the coil diameter is small and the rolling speed is high. Play. Moreover, it is possible to provide a tension fluctuation suppressing device that has a simple structure and high response.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a tension fluctuation suppressing device for a winder according to the present invention.
FIG. 2 is a schematic view showing another embodiment of a tension fluctuation suppressing device for a winder according to the present invention.
FIG. 3 is a graph showing an example of tension fluctuation and plate thickness deviation by the tension fluctuation suppressing device of the winder according to the present invention.
FIG. 4 is a graph showing an example of tension fluctuation and plate thickness deviation by a tension fluctuation suppressing device of a conventional winder.
FIG. 5 is a schematic view showing an example of a tension fluctuation suppressing device of a conventional winder.
6 is a partially enlarged view of what is shown in FIG. 5. FIG.
[Explanation of symbols]
3 Winding Machine 5 Coil Diameter Detector 10 Tension Fluctuation Suppressing Device 11 Base 12 Coil Copying Roll 13 Pressing Roll 14 Biasing Means (Spring Mechanism)
20 Tension fluctuation suppression device 21 Biasing means (cylinder)
22 Gap controller 23 Cylinder controller W Work C Coil S Servo mechanism

Claims (2)

A device that suppresses tension fluctuations due to a change in the diameter of a steel sheet coil wound on a winder during rolling,
A copying roll that follows the coil diameter while being in contact with the coil being wound, a pressing roll that applies tension to the steel plate alongside the mount on which the copying roll is mounted, and biases the mount toward the coil A tension fluctuation suppressing device for a steel sheet winder comprising an urging means for A device that suppresses tension fluctuations due to a change in the diameter of a steel sheet coil wound on a winder during rolling,
A coil diameter detector that detects a change in the coil diameter in the vicinity of the coil being wound, a pressing roll that applies tension to the steel sheet along with a mount on which the coil diameter detector is mounted, and the coil diameter detection A tension fluctuation suppressing device for a steel sheet winder comprising a servo mechanism for controlling the position of the gantry with a cylinder with respect to the coil so that the output of the machine becomes constant.

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