JP3575194B2 - Rolling control method and rolling control device for linear member - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling control method and a rolling control device for a linear member such as a steel bar. More specifically, the present invention relates to a rolling control method and a rolling control device for a linear member, which control rolling conditions while measuring a cross-sectional shape of a linear member such as a steel bar being rolled during rolling.
[0002]
[Prior art]
When a linear member R such as a bar (hereinafter, represented by a bar) is rolled by a tandem mill a, as shown in FIG. In this method, the processing heat generated by the rolling process is released to cool the steel bar R, and the strain generated by the rolling process is released.
[0003]
However, when the bar R is rolled, if the tension acting on the bar R to be rolled is small, the diameter of the rolled bar R increases as shown in FIG. When the tension acting on R is large, the diameter of the rolled steel bar R becomes small as shown in FIG. Therefore, in order to roll the steel bar R to a desired diameter, it is necessary not only to set the tandem mill a at a predetermined gap but also to perform rolling under a predetermined tension. Conventionally, the adjustment of the tension is performed by adjusting the rotational speed of the front and rear tandem mills a.
[0004]
However, what affects the diameter of the rolled steel bar R depends not only on the tension but also on, for example, the temperature variation of the steel bar R and the unevenness of the material. , A may not be rolled within a predetermined dimensional tolerance. Moreover, since the rolling conditions from the where is set based on an intermediate portion steel bars R, as shown in FIGS. 7 and 8, the predetermined tension is not obtained at the tip R ₁ and rear end R _2, Rolling cannot be performed to fall within the predetermined dimensional tolerance (see FIGS. 9 and 10). As a result, the tip portion R ₁ and the rear end portion R ₂ is discarded as rolled failure portion, the yield is deteriorated. Furthermore, the fact that the rolling conditions set before the start of rolling cannot be changed during rolling also contributes to the deterioration of product yield.
[0005]
In the case 9 tension is not appropriate, shows how the diameter of the rolled steel bar R is not within a predetermined tolerance at the tip R _1, in FIG. 10 if the tension is not adequate, the rear end R ₂ rolling The state in which the diameter of the set steel bar R does not fall within the predetermined tolerance is shown.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the problems of the related art, and it is possible to change the rolling conditions during rolling, and at the leading end or the trailing end, a bar or the like that can be rolled to be within a predetermined tolerance. It is an object of the present invention to provide a rolling control method and a rolling control device for a linear member.
[0007]
[Means for Solving the Problems]
The rolling control method for a linear member of the present invention is to provide a cross-sectional shape measuring means of a linear member to be rolled between a rolling section and a rolling section of a rolling device to measure a diameter distribution of the linear member during rolling. calculates a cross-sectional area of the linear member based on the measurement results, by comparing the cross-sectional area thereof was calculated to standard cross-sectional area, the rolling unit and / or the rear are disposed in front on the basis of the comparison result The rotation speed of the rolling section disposed in the section is adjusted .
[0009]
On the other hand, the rolling control apparatus for a linear member according to the present invention includes a cross-sectional shape measuring means for measuring a cross-sectional shape of the linear member being rolled, and an analysis of a cross-sectional shape based on measurement data from the cross-sectional shape measuring means. Cross-sectional shape analyzing means, tension analyzing means for analyzing the tension acting on the linear member being rolled based on the analysis result by the cross-sectional shape analyzing means, and rolling based on the analysis result of the tension analyzing means. Speed command value generating means for generating a speed command value of the rolling unit of the apparatus, and speed setting means for setting the speed of the rolling unit of the rolling device according to the speed command value generated by the speed command value generating means , The cross-sectional shape measuring means measures the diameter distribution of the linear member, the cross-sectional shape analyzing means calculates the cross-sectional area from the diameter distribution of the linear member, and the tension analyzing means uses the calculated cross-sectional area as a reference. Compared to the area and calculates the tension.
[0010]
Here, the cross-sectional shape means is provided on the inlet side of the rolling section in front of the rolling mill and on the outlet side of the rolling section behind.
[0011]
[Action]
Since the present invention is configured as described above, the tension acting on the linear member being rolled during rolling can be calculated. Therefore, when the calculated tension is not the predetermined value, the speed of the rolling section of the rolling device can be adjusted so that the tension is maintained at a predetermined value even during rolling.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on embodiments with reference to the accompanying drawings, but the present invention is not limited to only such embodiments. In the following embodiment, a case where a steel bar is rolled will be described.
[0013]
Embodiment 1
Rolling control apparatus 1 used in the first embodiment of the rolling control method of the present invention shown in block diagram in Figure 1, the rolling control apparatus 1, the rear tandem mill M ₂ for measuring the cross-sectional shape of the rolled steel bar R , A cross-sectional shape measuring means 10 provided on the outlet side of the, a shape analyzing means 20 for obtaining a cross-sectional shape from measurement data obtained by the cross-sectional shape measuring means 10, and a tension calculated from the cross-sectional shape obtained by the shape analyzing means 20 Tension analyzing means 30, a speed command value generating means 40 for generating a speed command value from the tension calculated by the tension analyzing means 30, a front tandem mill M it is made of a second speed setting means 60 for setting the rotational speed of the first speed setting means 50 and a rear tandem mill M ₂ for setting the _first rotational speed as the main components.
[0014]
As shown in FIG. 2, the sectional shape measuring means 10 includes a rotating cylinder 11, a first holding member 12 and a second holding member 13 for rotatably holding the vicinity of an end of the rotating cylinder 11, and a first holding member 12. And two rotation tables 14 and 15 vertically suspended from the outer periphery of the rotary cylinder 11 at intervals with the second holding member 13, and optics provided on opposing surfaces of the rotary tables 14 and 15. The main part includes a formula measuring unit 16, 16, a rotary transformer 17 provided between the rotary tables 14 and 15, and a driving unit 18 for rotating the rotary cylinder 11, and the center of the rotary cylinder 11 is rolled. The cross-sectional shape measuring means 10 is installed at a predetermined position in the rolling process so that the steel bar R passing therethrough passes. The detailed structure of the cross-sectional shape measuring means 10 is disclosed in Japanese Patent Application No. 8-82445.
[0015]
The shape analyzing means 20, the tension analyzing means 30, the speed command value generating means 40, the first speed setting means 50, and the second speed setting means 60 are specifically composed of shape analysis, tension analysis, speed command value generation and speed setting. Is a computer C that is programmed so as to be able to do the following. Then, the shape analyzing means 20 obtains the cross-sectional shape of the steel bar R from the distribution of the measured diameter of the steel bar R. The tension analyzing means 30 calculates the area of the obtained cross-sectional shape, and compares the calculated area with the reference area to calculate the tension acting on the steel bar R. The speed command value generating means 40 generates a rotational speed command value of the front tandem mill M ₁ of the rotation speed command value and the rear tandem mill M ₂ by the calculated tension. First speed setting means 50, a front tandem mill M to set the current value and voltage value of the motor of the front tandem mill M ₁ by the generated rotational speed command value of the front tandem mill M ₁ (not illustrated) ₁ is a predetermined rotation speed. The second speed setting means 60, the rear tandem mill M ₂ sets the current value and voltage value of the motor of the rear tandem mill M ₂ by the generated rotational speed command value of the rear tandem mill M ₂ (not shown) Is a predetermined rotation speed.
[0016]
As described above, the cross-sectional shape obtained when the tension is large is as shown in FIG. 6A, and the cross-sectional shape obtained when the tension is small is as shown in FIG. 6B. It becomes something. Therefore, if the tension is large, the calculated cross-sectional area is small, and if the tension is small, the calculated cross-sectional area is large. Therefore, if the cross-sectional area which is calculated is smaller than a predetermined value, the cross-sectional area or faster or slower rotation speed of the front tandem mill M _1, or the rotational speed of the rear tandem mill M ₂ becomes a predetermined value To do. On the contrary, if the cross-sectional area which is calculated is greater than a predetermined value, the front tandem to increase the rotational speed of the mill M ₁ or, or rear tandem slows the rotational speed of the mill M ₂ or sectional area is predetermined value So that That is, the rotational speeds of the front and rear tandem mills M ₁ and M ₂ are adjusted so that the tension becomes a predetermined value.
[0017]
Thus, in this first embodiment, the front cross-sectional shape measuring means 10 is provided on the outlet side of the rear tandem mill M ₂ measures the cross-sectional shape of the bars R online, and using the measured values Tandem by adjusting the desired value of the rotational speed of the mill M ₁ and rear tandem mill M ₂ during rolling, since the tension acting on the steel bar R is adjusted to a desired value, the product yield, the yield of, inter alia tip improves.
[0018]
Embodiment 2
FIG. 3 is a block diagram showing a rolling control device 1 used in a rolling control method according to a second embodiment of the present invention. The rolling control device 1 is a modified version of the first embodiment, and is a rolled steel bar. the cross-sectional shape measuring means 10 for measuring the R cross-sectional shape is made provided on the inlet side of the front tandem mill M _1. The remaining configuration, operation, and effect are the same as those in the first embodiment.
[0019]
Thus, in the second embodiment, provided with a cross-sectional shape measuring means 10 to the inlet side of the front tandem mill M ₁ to measure the cross-sectional shape of the bars R online, and the front using the measured value by adjusting the desired value of the rotational speed of the tandem mill M ₁ and rear tandem mill M ₂ during rolling, since the tension acting on the steel bar R is adjusted to a desired value, the product yield, especially in the rear end portion The yield is improved.
[0020]
Embodiment 3
FIG. 4 is a block diagram showing a rolling control device 1 used in a third embodiment of the rolling control method of the present invention. The rolling control device 1 is a modified version of the first embodiment, and is a rolled steel bar. the cross-sectional shape measuring means 10 for measuring the R cross-sectional shape is made by providing an intermediate portion of the front tandem mill M ₁ and the rear tandem mill M _2. The remaining configuration, operation, and effect are the same as those in the first embodiment.
[0021]
Thus, in the third embodiment, to measure the cross-sectional shape of the bars R online by providing a cross-sectional shape measuring means 10 in the middle portion of the front tandem mill M ₁ and the rear tandem mill M _2, and that by adjusting the rotational speed of the front tandem mill M ₁ and rear tandem mill M ₂ to a desired value using the measurement values, since the adjustment to the desired value the tension acting on the steel bar R during rolling, implementation As in the first and second embodiments, the product yield is improved.
[0022]
As described above, the present invention has been described based on the embodiments, but the present invention is not limited to only such embodiments. For example, the cross-sectional shape measuring means may be provided on both the inlet side of the front tandem mill and the outlet side of the rear tandem mill, or may be provided at an intermediate portion between the two.
[0023]
【The invention's effect】
As described in detail above, according to the present invention, the cross-sectional shape measuring unit is provided at an appropriate position between the front tandem mill and the rear tandem mill, the shape of the steel bar is measured online, and the measured value is used. By adjusting the rotation speed of the front tandem mill and the rear tandem mill to a desired value during rolling, the tension acting on the steel bar is adjusted to a desired value, so that an excellent effect of improving the product yield is obtained. Can be
[Brief description of the drawings]
FIG. 1 is a block diagram of a rolling control device used in a rolling method according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a cross-sectional shape measurement unit used in the embodiment.
FIG. 3 is a block diagram of a rolling control device used in a rolling method according to a second embodiment of the present invention.
FIG. 4 is a block diagram of a rolling control device used in Embodiment 3 of the rolling method of the present invention.
FIG. 5 is a block diagram of a conventional bar rolling device.
FIGS. 6A and 6B are explanatory diagrams showing a state in which the diameter of a rolled bar changes depending on the tension acting on the bar; FIG. 6A shows a case where the tension is small, and FIG. Show.
FIG. 7 is an explanatory view showing that a predetermined tension cannot be obtained at the distal end.
FIG. 8 is an explanatory view showing that a predetermined tension cannot be obtained at the rear end.
FIG. 9 is an explanatory view showing that a diameter becomes large because a predetermined tension cannot be obtained at a distal end portion.
FIG. 10 is an explanatory view showing that a predetermined tension cannot be obtained at the rear end, so that the diameter increases.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling control apparatus 10 Sectional shape measuring means 11 Rotating cylinder 12 First holding member 13 Second holding members 14, 15 Rotary table 16 Optical measuring unit 17 Rotary transformer 18 Drive unit 20 Shape analyzing means 30 Tension analyzing means 40 Speed command value Generating means 50 first speed setting means 60 second speed setting means R steel bar M tandem mill C computer

Claims (4)

Providing a cross-sectional shape measuring means of the linear member to be rolled between the rolling section and the rolling section of the rolling device, measuring the diameter distribution of the linear member during rolling , based on the measurement result, the linear member Calculate the cross-sectional area, compare the calculated cross-sectional area with the reference cross-sectional area, and adjust the rotation speed of the rolling section disposed in the front and / or the rolling section disposed in the rear based on the comparison result. Rolling control method for a linear member. The cross-sectional shape measuring means, the rolling control method of the linear member according to claim 1, characterized in that provided in front of the rolling unit inlet and / or behind the rolling section outlet side. Cross-sectional shape measuring means for measuring the cross-sectional shape of the rolled linear member, cross-sectional shape analyzing means for analyzing the cross-sectional shape based on measurement data from the cross-sectional shape measuring means, and analysis by the cross-sectional shape analyzing means Tension analysis means for analyzing the tension acting on the linear member being rolled on the basis of the result; and a speed command value for generating a speed command value for a rolling section of a rolling device based on the analysis result of the tension analysis means. Generating means, speed setting means for setting the speed of the rolling section of the rolling device according to the speed command value generated by the speed command value generating means ,
The cross-sectional shape measuring means measures the diameter distribution of the linear member,
The cross-sectional shape analysis means calculates a cross-sectional area from a diameter distribution of the linear member, and the tension analysis means calculates a tension by comparing the calculated cross-sectional area with a reference cross-sectional area. A rolling control device, characterized in that: 4. The rolling control device according to claim 3, wherein the cross-sectional shape means is provided at a front side of a rolling section and / or at a rear side of a rolling section.

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