JP3135114B2 - Automatic correction method for the distance between dies in a press-type width reduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically correcting the distance between dies in a press-type width reduction device for reducing the width of a material while changing the dies of a pair of press tools.

[0002]

2. Description of the Related Art In recent years, a slab material as a material for hot rolling has been mostly produced by a continuous casting machine from the viewpoint of energy saving. However, since the width of the slab material produced by the continuous casting machine cannot be easily and frequently changed, the majority of the width of the slab material is a fixed size. As described above, there is a disadvantage that a slab material having an arbitrary width cannot be obtained.

In order to cope with this, a press-type width reduction device has been developed, which enables a significant reduction, and the range of product widths manufactured from slab materials having the same width has been greatly expanded.

For example, in Japanese Unexamined Patent Publication No. Sho 63-242401, a press load generated by the width reduction and a bending amount of the press device accompanying the reduction are predicted before the width reduction. The press tool is set at the position where it is tightened by the amount. Thus, when the actual width reduction is performed, the tightening amount and the elongation amount cancel each other, and the target width is reduced.

On the other hand, in the rolling of stainless steel, the amount of width reduction by a vertical roll of a rough rolling mill is restricted in order to prevent the occurrence of surface defects called edge seams, and the width reduction accuracy by a pressing device is further improved. is needed.

On the other hand, for example, Japanese Patent Application Laid-Open No. 6-34400
Japanese Patent Publication No. 8 discloses a method of directly measuring the distance between dies using a laser after exchanging the dies. In addition, Japanese Unexamined Patent Publication
Japanese Patent No. 57504 discloses a mold in which molds having different mold thicknesses are prepared to prevent erroneous recognition of the mold thickness.

[0007]

However, there is still a problem with the conventional device, and it is not possible to improve the width reduction accuracy. For example, in the device disclosed in JP-A-6-344008, the device is expensive and
There is a problem that maintenance and maintenance of the measurement environment is difficult, for example, the installation position of the laser device itself changes due to the influence of water vapor or the like and construction. Further, the one disclosed in Japanese Patent Application Laid-Open No. Hei 8-57504 is effective for a large error of about 30 mm as illustrated, such as an error in inputting the thickness of a mold, but cannot provide highly accurate compensation. Further, even if the error is found, there is a problem that the rolling operation is interrupted because the error is manually corrected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is directed to a press-type width reduction device capable of improving the accuracy of the reduction width when performing width reduction using the press-type width reduction device. An object of the present invention is to provide a method for automatically correcting a distance between dies.

[0009]

According to the present invention, there is provided a method for automatically correcting a distance between dies in a press-type width reduction device, wherein a pair of dies are used to reduce the width of a hot slab in a sheet width direction. When performing a sheet width control in a hot rough rolling mill comprising a rolling mill equipment row equipped with a press type width reduction device having a press tool on the rough rolling mill input side, the distance between the dies of the dies at the time of no load. To the distance, add the mechanical elongation of the press-type width reduction device under load, determine the distance between the dies under load, the distance between the dies under load, and the material at the exit side of the press-type width reduction device. This problem has been solved by comparing the width with the width and correcting the distance between the dies under no load based on the difference.

[0010] Further, the material width on the exit side of the press-type width reduction device is measured by a sheet width meter provided between the press-type width reduction device and the rough rolling mill.

Alternatively, the material width at the exit side of the press-type width reduction device is calculated from the vertical roll opening when the constant-pressure pressing control is performed by the vertical roll of the first rough rolling mill downstream of the press-type width reduction device. It is something to do.

As a result of various investigations, the present inventors have found that, as shown in FIG. 1, the load width obtained by adding the material width Wp on the exit side of the press apparatus and the distance between the press dies under no load and the elongation under load. It has been found that the difference (Wp-Z) from the press die distance Z at the time has a strong correlation with the exit side width deviation after horizontal rolling, and based on the knowledge, the present invention has been made to solve the above-mentioned problems. It was done.

That is, according to the present invention, based on the difference between the distance between the press dies at the time of no load and the amount of elongation of the press device at the time of pressing, and the width of the material at the exit side of the press device. In addition, the distance between press dies when there is no load is corrected, so that the effects of changes in the distance between the dies caused by mold replacement, wear of components of the press device, play, etc. can be reduced. In addition, it has become possible to improve the width accuracy and to carry out highly accurate plate width control.

Here, the material width on the exit side of the press-type width reduction device may be measured by a plate width meter, or a constant pressure may be measured by a vertical roll of the first rough rolling mill downstream of the press-type width reduction device. It may be calculated from the vertical roll opening when the pressing control is performed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a schematic diagram showing the outline of the press-type width reduction device according to the first embodiment of the present invention.

In FIG. 2, the material to be rolled 10 is a rough rolling mill 16 comprising a vertical rolling mill 12 and a horizontal rolling mill 14.
After being reduced in width by a press-type slab width reduction device (press device) 18 installed on the entry side of the vertical rolling mill 12
And in a horizontal rolling mill 14.

Reference numeral 20 denotes a sheet width gauge for detecting the sheet width on the exit side of the press device 18, and reference numeral 22 denotes a control device for controlling the vertical roll opening of the vertical rolling mill 12. Reference numeral 24 denotes a press width output side material width detector, which detects a material width by a signal from the width meter 20 when the width meter 20 is installed,
When the width gauge 20 is not installed, a signal from the vertical roll opening control device 22 is received as described in detail below,
Calculate the material width from the vertical roll opening.

The width meter 20 is a laser type, self-luminous,
It is sufficient to use a conventional width gauge such as a backlight system.

Reference numeral 26 denotes a calculator for calculating the distance between press dies under load, and reference numeral 28 denotes a calculator for calculating a correction amount for correcting the distance between dies. Reference numeral 30 denotes a press die distance control device, and reference numeral 32 denotes an adder.

Hereinafter, the operation of the present embodiment will be described.

The material to be rolled 10 is firstly reduced in width by a pressing device 18.
The distance S0 between the press dies is set such that the width of the four exit sides becomes a predetermined target width. This press die distance S0
The press die distance control device 3
Due to 0, the distance fluctuates to a predetermined press die distance.

At least one point (N point) in the longitudinal direction of the slab during the pressing, the distance Z0 between the press dies and the press load P when no load is applied are measured. The distance Z between the press dies at the time of load is calculated by the equation 1).

Z = Z0 + P / M (1)

Here, M is a press spring constant.

Next, when the material to be rolled 10 reaches the width gauge 20 installed between the press device 18 and the roughing mill 16,
The material width Wb (a) corresponding to the point N in the slab longitudinal direction is detected by the material width detector 24 on the exit side of the press device.

Here, in the case where the width gauge 20 is not installed, when the material to be rolled 10 reaches the vertical mill 12, the vertical roll opening control device 2 equipped with a vertical roll rolling load detector is used.
2, a constant-pressure pressing control is performed so that a constant rolling load is obtained, and the vertical roll opening is operated, and the vertical roll opening E at the corresponding N point in the longitudinal direction of the slab is measured in the same manner as described above. 24.

The conversion from the vertical roll opening E to the material width Wp (b) is performed by the following equation (2).

Wp (b) = E + g (Pref) + Pref / ME (2)

Here, Pref is a set load at the time of performing the constant pressure pressing control, g (Pref) is a width change characteristic due to a rolling load in vertical roll rolling, and ME is a spring constant of a vertical rolling mill.

In the low rolling load range, g (Pref) ≒ 0, P
ref / ME ≒ 0, and for a 260 mm thick slab,
At Pref = 500 kN, it can be approximated to Wp (b) = E.

The material width Wp (a) (or Wp) is used for both the detection by the width gauge 20 and the detection by the vertical roll opening E of the constant pressure pressing control of the vertical rolling mill 12.
If (b)) can be detected, one of the material width Wp (b) calculated from the above formula (2) from the material width Wp (a) measured by the sheet width meter 20 and the vertical roll opening E. Is the material width Wp.

Next, the inter-die distance correction amount calculator 28 calculates the inter-die distance correction amount ΔS0. FIG. 3 shows the configuration of the inter-die distance correction amount calculator 28.

As shown in FIG. 3, in the inter-die distance correction amount calculator 28, the N-point press device exit side material width Wp corresponding to the press inter-die distance Z when the N points are loaded as measured above.
Is calculated by the comparator 40, and an abnormal sensor exclusion processor 42 for excluding an abnormal value calculates a difference (Wp-Z) representing the coils and excludes abnormal values between the coils. Next, the processing of a filter 44 for smoothing between the coils by a temporary delay filter or the like is performed to calculate a distance error between the dies. The distance correction amount ΔS0 is used.

The press die distance correction amount ΔS0 is added to the press die distance set value S0 for the next material to be rolled by the adder 32, and S0 + ΔS0 is the press die distance setting value for the next material to be rolled. Value.

An example of the effect of this embodiment is shown in FIGS.

As shown in FIG. 4, the press output side width deviation (W
Although pZ) fluctuates with the progress of rolling, as shown in FIG. 5, the present invention correctly estimates the distance between dies and corrects the distance between dies properly. As shown in FIG. 6, in the present embodiment, the horizontal width accuracy on the delivery side of the rolling mill is:
It is approximately ± 10 mm.

Conventionally, as shown in FIG. 7, the average value of the deviation of the exit width deviation of the horizontal rolling mill was X = 3.70 mm and the standard deviation σ = 7.51 mm. In the present embodiment, as shown in FIG. 8, the average value of the error of the width deviation on the exit side of the horizontal rolling mill is X = 0.55 mm, and the standard deviation is σ =
6.15 mm, the average value of the error was significantly reduced, the standard deviation (variation) was also reduced, and the output side width accuracy was improved.

Next, a second embodiment of the present invention will be described.

In the second embodiment, as shown in FIG.
As compared with the first embodiment shown in FIG. 2, a subtractor 34 is provided between the press device 18 and the press-to-die distance calculator 26, and the press used for calculating the press-to-die distance Z under load. Press-to-die distance Z0 when the distance between the dies is not loaded
But Z0-ΔS0 obtained by correcting this with the correction amount ΔS0
It is assumed that.

At this time, the configuration of the inter-die distance correction amount calculator 28 is different from that of FIG. 3 and is as shown in FIG. That is, instead of the filter 44 in FIG.
And the processing of the integrator 56. The second embodiment is also basically the same as the method of the first embodiment, but the gain 54 enables adjustment in consideration of the correction amount per operation.

Next, a third embodiment of the present invention will be described.

In the third embodiment, as shown in FIG.
A subtractor 36 is provided on the press device 18 side between the press device 18 and the press die distance calculator 26 to correct an error in the estimated die distance from the measurement stage. The configuration of the inter-die distance correction amount calculator 28 at this time is as follows.
This is the same as that of the second embodiment shown in FIG.

As a result, it is possible to control the sheet width quickly and more accurately.

In calculating the inter-die distance correction amount, the behavior of the difference (Wp-Z) may be different between a narrow material to be rolled and a wide material to be rolled. Accordingly, processing such as dividing the applicable section of each embodiment described above for each width or giving priority to the correction amount of the narrow material may be performed.

As described above, according to the present embodiment, it is possible to automatically correct the distance between the dies accompanying the exchange of the press dies. It has become possible to improve the accuracy of.

The embodiments of the present invention are not limited to those described above, and various other modifications are possible.

[0048]

As described above, according to the present invention,
Correction of the distance between dies due to press die exchange can now be performed automatically, so that the occurrence of width fluctuations due to press die exchange can be reduced, and width accuracy can be improved. Became possible.

[Brief description of the drawings]

FIG. 1 is a correlation diagram showing the correlation between the exit width deviation of a press and the exit width deviation of a horizontal rolling mill.

FIG. 2 is a configuration diagram schematically showing a press-type width reduction device according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram illustrating an operation of a distance correction amount calculator between dies in the first embodiment.

FIG. 4 is a graph showing a press-out side width deviation for explaining the effect of the first embodiment.

FIG. 5 is a diagram showing a distance error between dies for explaining the effect of the first embodiment;

FIG. 6 is a graph showing an output width deviation of a horizontal rolling mill for explaining the effect of the first embodiment.

FIG. 7 is a histogram of the width deviation on the exit side of a horizontal rolling mill according to a conventional method for comparison with the effect of the first embodiment.

FIG. 8 is a histogram of the width deviation on the exit side of a horizontal rolling mill showing the effect of the first embodiment.

FIG. 9 is a configuration diagram schematically showing a press-type width reduction device according to a second embodiment of the present invention.

FIG. 10 is a block diagram showing the operation of the inter-mold distance correction amount calculator in the second embodiment.

FIG. 11 is a configuration diagram schematically showing a press-type width reduction device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Material to be rolled 12 ... Vertical rolling mill 14 ... Horizontal rolling mill 16 ... Rough rolling mill 18 ... Press device (press type width reduction device) 20 ... Strip width gauge 22 ... Vertical roll opening control device 24 ... Press device output Side material width detector 26 ... Press mold distance calculator 28 ... Mould distance correction amount calculator 30 ... Press mold distance controller

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Kuwako 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corp. Chiba Works (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 1 / 02,15 / 00 B21B 37/00-37/78 G01B 5 / 02,11 / 04,21 / 02

Claims (3)

(57) [Claims] 1. A rolling mill equipped with a press-type width reduction device having a pair of press tools for reducing the width of a hot slab in a sheet width direction by using a pair of dies. When performing the sheet width control in a hot rough rolling mill, the distance between the dies of the dies under no load, the mechanical elongation of the press-type width reduction device under load is added, Find the distance between the dies, compare the distance between the dies under load and the material width at the exit side of the press-type width reduction device, and correct the distance between the dies under no load based on the difference. A method for automatically correcting the distance between dies in a press-type width reduction device. 2. The apparatus according to claim 1, wherein the width of the material at the exit side of the press-type width reduction device is measured by a width gauge provided between the press-type width reduction device and a rough rolling mill. Method for automatically correcting the distance between dies in a press-type width reduction device. 3. The vertical press when the constant width pressing control is performed by a vertical roll of a first rough rolling mill downstream of the press type width reduction device according to claim 1. A method for automatically correcting the distance between dies in a press-type width reduction device, wherein the distance is calculated from a roll opening degree.