JPH10225702A - Automatic dimension controlling method of shapes edger rolling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the high dimensional precision with a simple controlling method and equipment by regulating the amount of roll clearance of horizontal rolls of an edger rolling mill based on the corrective amount of roll clearance of vertical rolls of an universal rolling mill. SOLUTION: In a shapes rolled steel 3, the shapes height is measured with a shapes height measuring instrument 4 at the outlet side of a finish universal rolling mill. The shapes height measuring instrument 4 outputs the signal of shapes height to a computing element 5. The computing element 5 obtains the deviation of the measured shapes height against the target value and operates the corrective amount of roll clearance with this deviate and a prescribed equation. This operated result is outputted to a horizontal roll controller 6 of a horizontal roll screw down device 8 and a vertical roll controller 7 of a horizontal/vertical roll screw down device. In an edger rolling mill, the amount of roll clearance of a horizontal roll 1 is executed with feed forward controlling in a controlling period. The controlling period is matched to the controlling period of the vertical roll of the fore stage universal mill.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling dimensions of H-section steel, I-section steel, channel steel, rails and other sections.

[0002]

2. Description of the Related Art Universal rolling is widely used for rolling section steel such as H-section steel. In universal rolling,
By adjusting the roll gap between the horizontal roll and the vertical roll, various types of products can be manufactured. In order to improve the dimensional accuracy of the product, it is necessary to adjust the roll gap with high accuracy in accordance with changes in rolling conditions. In the universal rolling of a section steel, the head and bottom ends of the section steel are rolled by an edger rolling mill provided subsequent to the universal rolling mill, and the width of both sections is adjusted.

[0003] As a method for controlling the dimension of a section steel, there is, for example, a method for automatically controlling the thickness of a section steel in Japanese Patent Publication No. 63-66607. In this dimension control method, the material temperature at the entry side of the universal rolling mill and the rolling loads of the horizontal and vertical rolls of the universal rolling mill are measured, and the corrected roll gap between the horizontal roll and the vertical roll is determined from the measured values. And the amount of the gap between the rolls is controlled. By controlling the amount of gap between the rolls as described above, it is possible to secure a good dimension. It should be noted that if the vertical rolling operation is cut off by a universal rolling mill and rolling is performed using only horizontal rolls, the present invention is also applicable to automatic thickness control of edger rolling.

[0004]

Conventionally, in order to control the dimension of a shaped steel by the edger rolling, a rolling load or a dimension of the shaped steel is measured at the exit side of the edger rolling mill, and the roll gap amount is determined based on the measured value. Had been adjusted. Therefore, a measuring instrument is required, and the correction amount of the roll gap must be obtained based on the measured value, which causes a problem that a control method and equipment become complicated.

An object of the present invention is to provide an automatic dimensional control method capable of obtaining high dimensional accuracy with a simple control method and equipment in edger rolling of a section steel.

[0006]

An automatic dimensional control method for an edger rolling of a shaped steel according to the present invention is characterized in that a shaped steel is rolled by a rolling mill equipped with a universal rolling mill and a subsequent edger rolling mill. In the method of controlling the section steel size by adjusting the gap amount, adjusting the roll gap amount between the horizontal roll and the vertical roll with the universal rolling mill, and subsequently performing the edger rolling based on the roll gap correction amount of the vertical roll of the universal rolling mill. It is characterized in that the roll clearance of the horizontal roll of the machine is adjusted.

According to one aspect of the present invention, in the universal rolling mill, a model equation representing a relationship between a deviation of a section steel height from a target value and a roll gap correction amount is obtained in advance.
Measure the section steel height on the exit side of the universal rolling mill, calculate the roll gap correction amount of the vertical roll of the universal rolling mill by the section steel height deviation obtained from the measured value and the model formula, and obtain The roll gap amount of the horizontal roll of the edger mill is adjusted based on the roll gap correction amount of the vertical roll. In measuring the height of the section steel, for example, a strobe light, a laser beam, or the like is projected onto the section steel, and the light is detected by a one-dimensional or two-dimensional image sensor to obtain the section steel height.

According to the present invention, the roll gap amount of the horizontal roll of the edger rolling mill is adjusted based on the roll gap correction amount of the vertical roll of the preceding universal rolling mill. Therefore, the roll gap between the horizontal rolls can be adjusted without measuring the rolling load or the dimension of the shaped steel at the exit side of the edger rolling mill.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of obtaining a roll gap correction amount of a vertical roll in the universal rolling mill will be described. The roll gap correction amount of the vertical roll is obtained based on the shape steel height measured at the exit side of the universal rolling mill and a model formula obtained in advance. The model formula expresses the relationship between the shape steel height deviation and the roll gap correction amount, and is obtained as follows. FIG. 1 shows symbols for the dimensions of each section of the section steel used in the model formula. Note that these symbols have a subscript 0
The subscript 1 indicates the entry side of the rolling mill, and the subscript 1 indicates the exit side of the rolling mill. The dimensions of the symbols shown in FIG. 1 with the subscripts added are all set values.

The following equation (1) holds according to the constant law of mass flow.

(Equation 1)

[0011] For metal flow M _H and M _L of formula (1), determined by the resulting empirical formula or the like rolling experiment (2).

(Equation 2) The constants C _H1 , C _H2 , C _L1 , and C _L2 in Equation (2) are all constants related to metal flow. Furthermore, [delta] _H is the decrease of the head area due universal rolling, [delta] _L indicates the amount of reduction of the bottom area due the rolling, respectively.

From the first equation of equation (1), the head height increment Δ
When H _H1 is found,

(Equation 3) Becomes The width of the abdomen is widened by the reduction in the height direction of the section steel, and the width of the abdomen changes by ΔB _W1 . The above ΔH _H1 indicates a change in head height due to the abdominal width change ΔB _W1 . However, in equation (3), a perforated roll is used for the vertical roll,
It is assumed that the head width B _H does not change.

Similarly, when the increment ΔH _L1 of the bottom height is obtained from the second equation of the equation (1),

(Equation 4) Becomes The width of the bottom is expanded by the reduction in the height direction of the section steel, and the width of the bottom changes by ΔB _L1 . The ΔH _L1 indicates a change in the bottom height due to the bottom width change ΔB _L1 and the abdomen width change ΔB _W1 .

Therefore, the increment ΔH ₁ of the section steel height is calculated from the equations (3) and (4).

(Equation 5) However, since the determined abdomen height H _W by the roll width of the horizontal roll, abdomen in Formula (5) the height H _W is assumed to not change.

Next, the roll gap correction amount is determined from the target value H ₁ ^{* of} both the actually measured value H ₁ ^m of the section steel height measured at the exit side of the universal rolling mill.

The correction amount ΔH ₁ ^m of the section steel height on the exit side of the universal rolling mill is:

(Equation 6) It is expressed as Considering that the correction amount (feedback control amount) ΔS _V of the roll gap of the vertical roll of the universal rolling mill may be corrected by ΔH ₁ ^{m in} Expression (6),

(Equation 7) Becomes

From the second term of the equation (5), the roll gap correction amount of the horizontal roll of the edger rolling mill is given by ΔB _w1 = 0.
Considering that you only need to modify B _L1 ,

(Equation 8) Becomes These equations are stored in advance in a storage unit such as a control computer or an arithmetic device. The dimensional control is performed by an edger rolling mill following the universal rolling mill.

FIG. 2 shows an example of a roll configuration of an edger rolling mill. The horizontal roll 1 is a hole type roll, while the vertical roll 2 is a flat roll and is in contact with the side surface of the horizontal roll 1. The belly height of the rolled steel member 3 is determined by the roll width W _H of the horizontal roll 1.

FIG. 3 schematically shows a configuration of an edger rolling mill and a control device embodying the present invention. The section steel rolled material 3 is measured by the section steel height measuring device 4 on the exit side of the finishing universal rolling mill (the entrance side of the edger rolling mill). The section steel height measuring device 4 includes a light source 4a and a linear image sensor 4b that detects light from the light source.
The section height signal is output to the arithmetic unit 5. The arithmetic unit 5
The deviation of the measured section height from the target value is determined, and the roll gap correction amount is calculated based on the deviation and the model equations (7) and (8). This calculation result is output to the controller 6 of the horizontal roll reduction device 8 and the controller 7 of the horizontal / vertical roll reduction device (not shown) of the preceding universal rolling mill. In the edger rolling mill, the roll gap amount of the horizontal roll 1 is feed-forward controlled in the control cycle t based on the equation (8). This control cycle t
Is set in accordance with the control cycle of correcting the roll gap of the vertical roll of the preceding universal rolling mill. As a result, the section steel is rolled with high dimensional accuracy.

The edger rolling mill according to the present invention is not limited to the roll configuration shown in FIG. 2, but may be a roll configuration that lacks the vertical roll 2 and includes only the horizontal roll 1.

[0021]

EXAMPLES Under the following rolling conditions, unequal steel for guide rails was subjected to edger rolling following universal rolling. (1) Edger rolling mill, rolling speed: 200 m / min Horizontal roll: (φ) 450 mm × 220 mm (l) Vertical roll: (φ) 250 mm × 200 mm (l) (2) Material: ordinary steel (3) Rolling entry side Material dimensions: unequal shaped steel for guide rails Typical value H ₀ = 140.3 mm, target dimension H ₁ = 140.0 mm H _H0 = 41.8 H _H1 = 41.0 B _H0 = 64.3 B _{H1 = 64.0 H W0 = 73.6 H W1} = 73.5 B W0 = 15.2 B W1 = 15.0 H L0 = 25.1 H L1 = 25.5 B L0 = 124.5 B L1 = 122 0.0 (4) Inlet material temperature (set value): 990 ° C (5) Horizontal roll reduction r _L = (1−B _L1 / B _L0 ) ×
100 = 2.0% (6) Control cycle: 0.1 sec. In the case of the conventional method, based on the height and width of the head, abdomen, and bottom at the entrance and exit of the rolling, and the initial settings of the temperature at the entrance of the rolling. When roll gap is set, head width dimensional accuracy is ± 0.6%
(± 0.4mm), dimensional accuracy of abdomen width ± 2.0% (±
0.3mm), dimensional accuracy of bottom width is ± 0.9% (± 1.1%)
mm). On the other hand, in the case of the present invention, the dimensional accuracy of the head width is ± 0.5% (± 0.3 mm), the dimensional accuracy of the abdomen width is ± 2.0% (± 0.3 mm), and the bottom width is The dimensional accuracy was ± 0.5% (± 0.6 mm).

[0022]

According to the present invention, at the exit side of the edger rolling mill, without measuring the rolling load or the shape steel size,
The roll gap of the horizontal roll can be adjusted. Therefore, high dimensional accuracy can be obtained with a simple control method and equipment. Further, by improving the dimensional accuracy, the product yield can be improved.

[Brief description of the drawings]

FIG. 1 is a drawing showing symbols for dimensions of each section of a section steel used in a model formula of the present invention.

FIG. 2 is a drawing showing an example of a roll configuration of an edger rolling mill.

FIG. 3 is a drawing schematically showing an example of a configuration of an edger rolling mill and a control device embodying the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal roll 2 Vertical roll 3 Shaped steel rolled material 4 Height measuring device 5 Computing unit 6 Controller for horizontal roll 7 Controller for vertical roll 8 Horizontal roll reduction device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoichi Aratani 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division

Claims (2)

[Claims] 1. Rolling a section steel with a rolling mill equipped with a universal rolling mill and a subsequent edger rolling mill,
In the method of controlling a shape steel size by adjusting a roll gap amount during the rolling, the universal roll mill adjusts a roll gap amount of a horizontal roll and a vertical roll, and subsequently corrects a roll gap of a vertical roll of the universal rolling mill. An automatic dimension control method for section steel edger rolling, comprising adjusting a roll gap amount of a horizontal roll of an edger rolling mill based on the amount. 2. In the universal rolling mill, a model formula representing a relationship between a deviation of the section steel height from a target value and a roll gap correction amount is obtained in advance, and the section steel height is measured on the exit side of the universal rolling mill. Based on the shape steel height deviation obtained from the measured value and the model formula, the roll gap correction amount of the vertical roll of the universal rolling mill is calculated, and the roll gap correction amount of the obtained vertical roll is calculated based on the obtained roll gap correction amount, and the edger rolling is performed. 2. The method according to claim 1, wherein the gap between the horizontal rolls of the machine is adjusted.