KR20150082529A - Plate camber detection device, descaling control device, and pass schedule calculation device - Google Patents

Abstract

A plate warpage detecting device (5) capable of detecting a warp of a pressurized steel strip (4) without using a dedicated device is provided. The plate warpage detecting device 5 has a gauge meter thickness calculating section 5a for calculating a gauge meter thickness of the pressurized steel strip 4 on the basis of a rolling load actual value and a roll gap actual value during rolling in the rolling mill 1, And the detected thickness of the pressurized flexible material (4) and the gauge meter sheet thickness detected by the plate gauge (3) arranged on the downstream side of the rolling mill (1) with respect to the rolling direction are set to the same point sampling data of the formal pitch And a detecting section for detecting warpage of the side of the pressurized flexible material 4 based on the same point sampling data.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plate warping detection apparatus, a descaling control apparatus, a pass schedule calculation apparatus,

The present invention relates to a plate warpage detecting device, a descaling control device, and a path schedule calculating device.

There has been proposed a plate warpage detecting apparatus for detecting deflection of a pressurized sheet based on an image picked up by a CCD camera. According to the plate warpage detecting apparatus of the present invention, it is possible to detect the warp of the pressurized steel strip (see, for example, Patent Documents 1 and 2).

However, in this plate warpage detecting apparatus, it is necessary to provide a CCD camera dedicated to plate warp nearest to the rolling mill.

On the contrary, a plate warpage detecting apparatus has been proposed which estimates the elongation difference of the upper and lower surfaces of the pressurized steel strip from the rotating speed of the upper and lower work rolls of the rolling mill, and detects the warp of the pressurized steel strip on the basis of the elongation difference. According to the plate warpage detecting apparatus of the present invention, it is possible to detect the warp of the pressurized sheet material without using a plate warp-only apparatus (see, for example, Patent Document 3).

Japanese Patent No. 3724720 Japanese Patent Application Laid-Open No. 2006-7235 Japanese Patent Laid-Open No. 2002-96103

However, the difference in the deformation resistance between the upper surface and the lower surface of the pressure-sensitive laminated material also causes warpage of the pressure-sensitive laminated material. For this reason, it is difficult to detect the warp of the pressurized steel sheet only by the difference in the rotational speed of the upper and lower work rolls.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a plate warpage detecting apparatus and the like capable of detecting deflection of a pressurized steel sheet without using a dedicated apparatus.

The plate warpage detecting apparatus according to the present invention includes a gauge meter thickness calculating unit for calculating a gauge meter thickness of the pressurized steel strip on the basis of a rolling load actual value and a roll gap actual value during rolling in a rolling mill, The detection thickness of the pressurized sheet material detected by a plate thickness meter disposed on the downstream side of the rolling mill with respect to the rolling direction of the continuous material and the gauge meter thickness calculated by the gauge meter thickness thickness calculating section are set to a predetermined length ) Equivalent point of the pitch The same point data editing unit edits the sampling data and the same point of the detected thickness edited by the same point data editing means and the gauge meter plate thickness Based on the sampling data, And a detecting unit for detecting the warping of the recording medium.

In the descaling control device according to the present invention, when the plate warpage detecting device detects warpage of the side of the above-described pressurized steel strip in the intermediate rolling pass when the rolling mill reciprocally rolls the steel strip, And a descaling control unit for stopping the water injection in the generating unit.

In the pass schedule calculation device according to the present invention, when the plate warpage detection device detects warpage of the side of the pressurized steel strip in the intermediate rolling pass when the rolling mill rolls back the pressure rolled strip, And a warp correction path adding unit for adding a light pressure lower path.

According to the present invention, it is possible to detect the warp of the pressurized sheet material without using a dedicated apparatus.

1 is a block diagram of a plate warpage detecting apparatus according to Embodiment 1 of the present invention.
FIG. 2 is an example of a time chart of a gage meter thickness and a plate thickness detection thickness used in a plate warpage detecting apparatus according to Embodiment 1 of the present invention. FIG.
3 is an example of a time chart of the gage meter thickness and plate thickness detection thickness used in the plate warpage detecting apparatus according to Embodiment 1 of the present invention.
4 is a side view of a pressurized steel sheet rolled by a rolling mill using the plate warpage detecting apparatus according to the first embodiment of the present invention.
5 is an enlarged view of a main part of Fig.
6 is a view for explaining a calculation result of a warp height by the plate warpage detecting apparatus according to the first embodiment of the present invention.
7 is a block diagram of a plate warpage detecting apparatus according to Embodiment 2 of the present invention;
8 is a block diagram of a descaling control apparatus using a plate warpage detecting apparatus according to Embodiment 3 of the present invention.
9 is a diagram for explaining a control method of a descaling apparatus by a descaling control apparatus using a plate warpage detecting apparatus according to Embodiment 3 of the present invention.
10 is a block diagram of a path schedule calculation device using a plate warpage detection device according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description thereof will be omitted or omitted as appropriate.

Embodiment Mode 1.

1 is a block diagram of a plate warpage detecting apparatus according to Embodiment 1 of the present invention.

1, a header 2 of a descaling apparatus is provided on one side of a reversible rolling mill 1. At one side of the header 2, a plate follower 3 is provided.

The rolling mill 1 reciprocally rolls the rolled steel strip 4 such as a post-steel strip. At this time, the rolling load actual value P and the roll gap actual value S of the rolling mill 1 are sampled at regular intervals. The header 2 of the descaling device appropriately ejects water against the pressurized strips 4. [ The plate thickness meter 3 samples the plate thickness detection thickness at regular intervals.

A plate warpage detecting device 5 is connected to the rolling mill 1 and the plate descent system 3. The plate warping detecting apparatus 5 includes a gauge meter thickness calculating section 5a, an identical point data editing section 5b, and a curvature curvature calculating section 5c.

Or the like on the basis of the gauge meter thickness computing unit (5a), the rolling load actual performance value (P), and calculates the mill expansion amount (S _m). More specifically, the elongated amount of the stretch (S _m ) is calculated by the following formula (1).

[Equation 1]

Note that W is the width of the pressure-applied string 4. D _R is the roll diameter. f _m () is a function formula for calculating the elongation at the mill (S _m ).

Next, the gauge meter thickness calculating section 5a calculates the gauge meter thickness h _GM based on the roll gap actual value S, the mill elongation amount S _m , and the like. Specifically, the gage meter plate thickness (h _GM ) is calculated by using the following equation (2).

[Equation 2]

However, R _THML is the roll thermal expansion amount. R _WEAR is the amount of roll wear.

For example, the same point data editing unit 5b samples the plate thickness detection thickness every 20 msec. Periodic sampling of the plate thickness detection thickness is carried out in such a manner that the tip end of the pressurized flexible member 4 is in contact with the platen 3 when the platen 4 is transported in the direction of the platen 3 from the rolling mill 1 And reaches the position immediately below (directly below) the plate descent system 3 and then stops. When the electrostatic conveyance of the pressurized elongation member 4 is stopped, the position of the pressurized elongation member 4 immediately below the plate succeeding table 3 becomes the plate thickness sampling end position. That is, no periodic sampling of the plate thickness detection thickness is carried out during the conveyance of the pressurized flexible material 4, and during the reverse conveyance from the plate 3 to the rolling mill 1.

For example, the same-point data editing unit 5b may be configured to obtain regular-period sampling data of the plate thickness detection thickness on the basis of the table speed actual values under the plate thickness meter 3, .

The same point data editing section 5b edits the gauge meter sheet thickness calculated by the gauge meter sheet thickness calculating section 5a into the sampling data of the same formal pitch as the plate sheet detecting thickness on the basis of the speed actual value of the rolling mill 1 .

The curvature curvature computing unit 5c detects curvature based on the same point sampling data of the plate thickness detection thickness edited by the same point data editing unit 5b and the gauge meter plate thickness as a detection unit. Specifically, a curvature radius of curvature, a curvature height, and a curvature length for each identical point are calculated.

Next, the results of the sampling of the gauge meter thickness and the plate thickness detection thickness will be described with reference to Figs. 2 and 3. Fig.

2 and 3 are examples of time charts of gauge meter thickness and plate thickness detection thickness used in the plate warpage detecting apparatus according to Embodiment 1 of the present invention.

The horizontal axis in Figs. 2 and 3 represents time. The uppermost vertical axis in Figs. 2 and 3 represents the rolling load. The ordinate of the second-stage from the top in Fig. 2 and Fig. 3 represents the thickness of the gauge meter. The ordinate of the third row from the top in FIGS. 2 and 3 indicates the plate thickness detection thickness. The vertical axis at the lowermost end of Figs. 2 and 3 indicates the speed of the rolling mill 1.

Fig. 2 shows an example in which no warping of the pressurized flexible member 4 occurs. As shown in Fig. 2, first, the gauge meter plate thickness is sampled. Thereafter, the plate thickness detection thickness is sampled. There is no abrupt change in either sampling result.

3 shows an example when warpage of the pressurized flexible material 4 occurs. In Fig. 3, the portion corresponding to the side of the pressurized flexible member 4 is surrounded by a round dashed line in the figure of the gauge meter thickness and the plate thickness detection thickness. As shown in Fig. 3, the fluctuation of the gauge meter plate thickness is equivalent to the case where the bending of the pressurized flexible member 4 does not occur. On the other hand, the plate thickness detection thickness fluctuates more largely than the case where the warpage of the pressurized flexible material 4 does not occur. That is, the warpage of the pressurized steel strip 4 appears as a fluctuation of the plate thickness detection thickness.

Next, the calculation procedure of the curvature radius of curvature, warp height, and warp length of the pressurized steel strip 4 will be described with reference to Figs. 4 and 5. Fig.

4 is a side view of a pressurized steel sheet rolled by a rolling mill using the plate warpage detecting apparatus according to the first embodiment of the present invention. 5 is an enlarged view of the main part of Fig.

As shown in Fig. 4, the detection direction of the plate thickness detection thickness is perpendicular to the conveying direction of the pressurized sheet 4. For this reason, the value of the plate thickness detection thickness differs from the value of the gauge meter plate thickness at the warped portion of the pressurized flexible member 4.

5, the curvature curvature calculator 5c calculates the curvature radius, the curvature height, and the curvature length at each sampling position on the basis of the thickness detection thickness of the adjacent sampling position, the gauge meter thickness, and the like Do. 5, in order to simplify the explanation, the two sampling points are denoted by reference numerals.

X ₁ (mm) is a sampling position. X ₂ (mm) is the next sampling position of the sampling position X ₁ . ΔX ₁₂ is a distance between the sampling positions (X ₁₎ and the sample position (X _2).

H _{gm , 1} (mm) is the gauge meter plate thickness at the sampling position (X ₁ ). H _{gm , 2} (mm) is the gauge meter plate thickness at the sampling position (X ₂ ). H _{scn , 1} (mm) is the plate thickness detection thickness at the sampling position (X ₁ ). H _{scn , 2} (mm) is the plate thickness detection thickness at the sampling position (X ₂ ).

First, the warp curvature calculating section (5c) is the deflection angle (θ ₁₎ at the sampling positions (X ₁₎ calculated using the following (3) formula.

[Equation 3]

Next, the warp curvature calculating section (5c) is the deflection angle (θ ₂₎ at the sampling position (X ₂₎ will be calculated using the following (4) equation.

[Equation 4]

Next, the warp curvature calculating section (5c), the sampling position (X ₁₎ and the sampling position of the bending angle difference between the (X _{2) (12} Δθ) is calculated using the (5) formula.

[Equation 5]

Next, the warp curvature calculating section (5c) is the true length (ΔS ₁₂₎ of the confined material (4) to move between a sampling position (X ₁₎ to the sampling position (X ₂₎ using the following 6 formulas of .

[Equation 6]

Next, the curvature radius calculating unit 5c calculates the radius of curvature R ₁ at the sampling position X ₁ using the following equation (7).

[Equation 7]

Next, the curvature curvature calculation unit 5c calculates the curvature height (H _{wrap , 1} ) at the sampling position (X ₁ ) using the following equation (8).

[Equation 8]

Next, the curvature curvature computing unit 5c recognizes a sampling position at which the curvature height of the pressure-sensitive expanding member 4 is equal to or smaller than the minimum curvature recognition height. For example, the minimum recognition height is preset to 20 mm. Thereafter, the curvature curvature computing unit 5c calculates the length from the tip end of the pressurized flexible member 4 to the sampling position as the bending length.

Next, the calculation result of the warp height of the pressurized steel strip 4 will be described with reference to Fig.

6 is a diagram for explaining a calculation result of a warp height by the plate warpage detecting apparatus according to the first embodiment of the present invention.

The abscissa axis of Fig. 6 represents the distance from the tip of the pressure-sensitive expandable member 4. The ordinate on the left side of Fig. 6 represents the gage meter thickness and the plate thickness detection thickness. The vertical axis on the right side of Fig. 6 represents the warp height.

As shown in Fig. 6, the thickness of the gauge meter is a substantially constant value regardless of the distance from the tip of the pressurized flexible member 4. On the other hand, the plate thickness detection thickness becomes larger as the distance from the front end of the pressurized flexible member 4 is short. In the position where the distance from the tip of the pressurized flexible member 4 is longer than about 700 mm, the plate thickness detection thickness is almost equal to the gauge meter plate thickness.

In this case, the shorter the distance from the front end of the pressurized flexible member 4, the larger the curled height of the pressurized flexible member 4 becomes. At a position longer than the distance from the tip of the pressurized flexible member 4 by about 700 mm, the flexural height of the pressurized flexible member 4 becomes almost zero. That is, it can be seen that the bending of the pressurized flexible member 4 does not occur at a position longer than the distance from the tip of the pressurized flexible member 4 by about 700 mm.

According to the first embodiment described above, the warp of the pressurized flexible member 4 is detected by using the generally provided plate guide 3. Therefore, it is possible to detect the warp of the pressurized steel strip 4 without using a dedicated device.

The curvature of curvature of the pressurized sheet 4 may be calculated using the data of the previous sampling position (i-1) and the next sampling position (i + 1) for each sampling position (i).

Embodiment 2:

7 is a block diagram of a plate warpage detecting apparatus according to Embodiment 2 of the present invention. The same or similar parts as those of the first embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

There may be an error between the gauge meter thickness and the true plate thickness of the pressurized steel strip 4. [ This error is called the gauge meter error. In the case where there is a gauge meter error, there is a deviation between the gauge meter thickness and the plate thickness detection thickness, also in the vicinity of the top of the pressurized softened material 4. [ This deviation causes the calculation accuracy of the curvature of curvature and the curvature height of the pressurized flexible member 4 to be lowered.

Thus, the plate warpage detecting device 5 of the second embodiment is provided with the gauge meter deviation correcting section 5d. The gauge meter deviation correction section 5d compares the gauge meter deviation correction amount? H _gm ^comp with the following equation (9) based on the gauge meter thickness and the plate height detection thickness edited by the same point data editing section 5b .

[Equation 9]

Here, h _scn ^body (mm) is the average value of the plate thickness detection thickness at the top (stationary portion) of the pressurized flexible member 4. h _gm ^body (mm) is the average value of the thickness of gauge meter at the top of the pressure-sensitive expanding member 4. For example, the top of the pressurized flexible member 4 is defined as a range of the length of 30% of the length of the pressurized flexible member 4 in each pass out side in the rolling direction center portion of the pressurized flexible member 4.

Bending curvature calculating section (5c) of the present embodiment, the confined material (4) bending radius of curvature, the warp height, gauge meter discrepancy correction amount in all the same point sampling data of the gauge meter thickness in calculating the warp length (Δh _gm ^comp of ).

According to the second embodiment described above, it is possible to correctly detect the warpage of the pressurized steel strip 4 even when an error occurs between the thickness of the gauge meter and the true thickness of the steel strip 4.

Embodiment 3

8 is a block diagram of a descaling control apparatus using the plate warpage detecting apparatus according to Embodiment 3 of the present invention. The same or equivalent parts as those of the second embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

8, the descaling control apparatus 6 includes a control section 6a. The control unit 6a has a function of controlling the water jetting of the descaling device on the basis of the warp length of the hydraulic rods 4 detected by the plate warping detecting device 5. [

Next, a control method of the descaling device will be described with reference to Fig.

9 is a view for explaining a control method of a descaling apparatus by a descaling control apparatus using a plate warpage detecting apparatus according to Embodiment 3 of the present invention.

9, when the warp of the pressurized flexible material 4 is detected at any path (i-path), the plate warpage detecting device 5 detects information about the warp length of the pressurized flexible material 4 by descaling And outputs it to the control device 6. In the next i + 1 pass, the curvature start position is located forward of the tail length of the pressurized flexible material 4 by the amount of the curvature.

Then, the descaling control device 6 tracks the leading edge of the pressure-sensitive strip 4 during the rolling of the (i + 1) th pass. At the top of the pressure sensitive string 4, the descaling control device 6 subjects the descaling device to descaling. According to the present embodiment, the header 2 ejects water to the spray contact point of the pressurized soft material 4. [ Thereafter, when the warp start position of the pressurized stretchable material 4 reaches the spray contact point, the descaling control device 6 stops the water jetting to the descaling device.

According to the third embodiment described above, no water is sprayed on the portion where the bending of the pressurized flexible member 4 occurs. Therefore, local overcooling can be prevented with respect to the occurrence of warping of the pressurized flexible member 4. [ As a result, it is possible to stabilize the temperature control of the pressurized strip 4. Due to the stability, sufficient mechanical properties can be obtained in the final product.

The descaling position of the descaling is determined based on the warping length of the pressure-applying member 4. Therefore, homogenization of the pressure-sensitive expandable member 4 can be expected more than the treatment by the naked eye of the operator.

Embodiment 4.

10 is a block diagram of a path schedule calculation device using a plate warpage detection device according to a fourth embodiment of the present invention. The same or equivalent parts as those of the second embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

In Fig. 10, the path schedule calculation device 7 includes a warp correction path adding unit 7a. The warp correction path adding section 7a adds a warp correction path to the path schedule determined by the path schedule calculation device 7 on the basis of the warp height of the wire rod 4 calculated by the plate warpage detecting device 5 .

For example, the warp correction pass is set to a path that is sufficiently smaller in the amount of reduction in deformation than in normal pressing. For example, the warp correction path is set to be the same roll gap as that of the actual path immediately before. For example, in the warp correction path, the number of calibration passes and the amount of each of the path corrective press-downs are set in accordance with the warp height of the pressurized sheet 4.

For example, the number of calibration passes N is calculated by the following equation (10).

[Equation 10]

For example, each path correction reduction amount? H is calculated by the following equation (11).

[Equation 11]

However, the H _wrap ^max (mm) is the maximum value of the warp height of the pressurized strip 4. f _pss () is a function for determining the number of calibration passes N on the basis of the warp height of the pressure- f _red () is a function for determining each path calibration reduction amount? h on the basis of the warp height of the pressurized flexible member 4.

According to the fourth embodiment described above, when warpage of the pressurized flexible member 4 occurs, a warp correction path is added to the pass schedule after the next pass. Therefore, warping of the pressurized flexible member 4 can be reduced. As a result, it is possible to avoid the unstable conveying of the pressure-sensitive expanding member 4. In addition, it is possible to avoid collision of the pressure application strips 4 on peripheral equipment such as a leveler on the downstream side and a cooling device. This avoidance improves the production efficiency. At this time, the number of calibration passes, the amount of corrective reduction in each pass, and the like are determined according to the height of the warpage of the pressurized flexible member 4. As a result, the burden on the operator can be greatly reduced.

Further, even if the warp correction pass is set by using a table for layer indexing the number of calibration passes and the amount of each of the calibration proof pressures by setting the maximum value of the warp height of the pressurized flexible member 4 as a layer-by- good.

[Industrial Availability]

INDUSTRIAL APPLICABILITY As described above, the plate warpage detecting apparatus according to the present invention can be used in a rolling system for detecting warpage of a pressurized steel sheet without using a dedicated apparatus.

1: rolling mill
2: Header
3: plate succession
4: Pressurized series
5: plate warpage detecting device
5a: gauge meter plate thickness calculating unit
5b: the same point data editing section
5c: curvature curvature operation unit
5d: gauge meter deviation correction section
6: descaling control device
6a:
7: Pass schedule calculation device
7a: warp correction path adding unit

Claims (4)

A gauge meter thickness calculating section for calculating a gauge meter thickness of the pressurized steel strip on the basis of a rolling load actual value and a roll gap actual value during rolling in the rolling mill,
The detected thickness of the pressurized sheet material detected by the plate thickness meter disposed downstream of the rolling mill and the gauge meter thickness calculated by the gauge meter thickness calculating section with respect to the rolling direction of the pressurized steel material by the rolling mill, Point data editing unit for editing the same-point sampling data,
And a detecting section for detecting warping on the side of the line-of-seamed material on the basis of sampled data of the same point between the detected thickness edited by the same-point data editing means and the gauge meter plate thickness. The method according to claim 1,
And a deviation correcting section for calculating an average deviation between the detected thickness of the top portion of the string of pressure and the gauge meter thickness on the basis of sampled data of the same point sampled between the detected thickness edited by the same point data editing means and the gauge meter thickness and,
Wherein the detecting section corrects the gage meter sheet thickness using the average deviation. The plate warpage detecting device according to any one of claims 1 to 3, wherein, in a case where the warp of the side of the pressurized steel strip is detected in the intermediate rolling pass when the rolling mill reciprocates the pressurized strip, And a descaling control unit for stopping the water injection in the buckling generating unit. The plate warpage detecting device according to any one of claims 1 to 3, wherein, when the warp of the side of the pressurized steel strip is detected in the intermediate rolling pass when the rolling mill reciprocates the pressurized strip, And a warp correction path adding unit for adding a lightly-compressed path to the pass schedule.

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