JPH03146209A - Tension controller for h-shaped steel rolling equipment - Google Patents

Abstract

PURPOSE:To execute tension control with good accuracy by driving the tension controller in accordance with a rolling torque computing means, flange correction rate computing means, torque deviation computing means, and speed correction rate computing means. CONSTITUTION:The flange correction rate which indicates the ratio of deformation resistant at the time of rolling the flange parts of a rolled stock 100 with a finishing mill stand F is computed by the flange correction rate computing means 8. The torque deviation between the respective mill stands at which the tension acting on the rolled stock between the respective mill stands attains a prescribed value is computed by the torque deviation computing means 9 in accordance with the results of the computation of the rolling torque computing means 7 and the flange correction rate computing means 8. The correction rates of the rotating speeds of the respective rolls of an edger mill stand E and the finishing mill stand F are computed by the speed correction rate computing means 10 in accordance with the computed torque deviation. The edger mill stand E and the finishing mill stand F are respectively subjected to the controlled driving in accordance with the results of this computation.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a tension control device for H-shaped rolling equipment.

(Prior Art) A conventional tension control device for an H-shaped rolling mill will be explained with reference to FIG. Material 100 is Universal Mill Stand U
The universal mill stand U1, the edger mill stand E1, and the finishing stand F are electric motors, 3U, and 3B, respectively.

and 3 via the drive device 5U, 5. , and 5°, each of which is controlled to a predetermined reference speed. At the time when the material 100 is bitten by the universal mill stand U, no tension is acting on the material 100,
There is no tension. At this time, the rolling reaction force P UM (ton) and rolling torque GUM (cg·m) of the horizontal roll and vertical roll of the mill stand U are detected by the load detector 2. The rolling torque calculation means 7 calculates the rolling torque based on the detected value and the data stored in the storage means 6. Here, rolling reaction force PU
M is Po (ton) is the rolling reaction force of the horizontal roll, P
When v (ton) is the rolling reaction force of the vertical rolls, it is calculated by the following equation (1).

p-α11PH+β・PV scream...""" (1)
N Here, α and β are coefficients determined by the material.

Further, the rolling torque GUN is calculated using the following equation (2).

Here, V, N, I, R are the voltages (V) of the drive motor 3U.
, rotational speed Crptx>, current (A), resistance (Ω), K, 2. 3. 4 is a coefficient.

When the material is then bitten into mill stand E, tension (or compressive force) is created between mill stands U and E. At this point, the rolling reaction force P uo (ton) and the rolling torques G and D (mm) of the horizontal rolls and vertical rolls of the mill stand U are calculated by the rolling torque calculating means 7 as described above at certain time intervals. . Further, the tension torque (also referred to as torque deviation) ΔGU (kg-m) generated in the material 100 between mill stands U and E is expressed by the following equation (3).

On the other hand, in order to control the tension between stands U and E to be constant, the following equation (4) needs to hold true.

ΔGU conflict ωU + ΔGE・ωE−o ... (4) Here, ΔGE, ωU, and ωE are the tension torque of mill stand E and the angular velocity of mill stand U (radian/see), respectively.
) is the angular velocity of stand E (radian/5ee).

From equation (4), ΔGE is obtained as: Here, NULNE is an electric motor 3. which drives mill stands U and E, respectively. ．． 3E rotation speed (
rp■).

The tension torque ΔGE is calculated by the torque deviation calculation means 9. Then, based on the calculated tension torque ΔGE, a correction amount NE of the rotational speed of the electric motor 3E that drives the mill stand E is determined by the speed correction amount calculating means 1o using the following equation (6).

ΔNE-gE・ΔGE ...Scream...Town...
(6) Here, gB is control gain (rpm/kg-m)
shows.

Based on the obtained correction amount ΔNE, the mill stand E is controlled by the drive device 5E via the electric motor 3E so that the correction amount becomes zero.

Next, when the material 100 is caught in the finishing mill stand F, it is controlled as shown in Japanese Utility Model Publication No. 53-32111.

In other words, the rolling torque GE of mill stand E when no tension is applied
M′ & rolling load PEM are determined by the following equations (7) and (8).

PEM-αE ΦPHE+βE 11PvE...Song
(8) Here, GED is the detected value of the rolling torque of mill stand E, and is obtained using equation (2). Also, P
HE and PvE indicate the rolling reaction force of the horizontal rolls and the rolling reaction force of the vertical rolls of mill stand E. Note that αE and βE are coefficients determined depending on the material.

The rolling torque G and the rolling load P are calculated by the rolling torque calculating means 7.

And the torque deviation ΔGE between mill stands E and F
F is calculated by the torque deviation calculating means 9 using the following equation (9).

Here, PED indicates a detected value of rolling load.

An electric motor 3 that drives the stand F based on the calculated torque deviation ΔGEF. The rotation speed correction amount ΔNF is calculated by the speed correction amount calculating means 10 using the following equation.

ΔN −g φΔGEF ・・・・・・・・・・・・
・・・・・・・・・(lO)F Here, g(indicates the control gain.

Based on this correction amount ΔNF, the stand F is driven by the drive device 5F via the electric motor 3.

Note that at this time, the mill stand E is controlled based on equation (6).

(Problem to be Solved by the Invention) In such H-shaped rolling equipment, due to the difference in roll shape between the universal mill stand U and the finishing mill stand F, the universal mill stand U has a Unexpressed disturbance tension is at work. This disturbance tension will be explained with reference to FIG.

FIGS. 2 CI&> and (b) show front and plan views of the material 100 being rolled in the finishing mill stand F. FIG. The flange surface 104 of the material (H-shaped #[) 100 is inclined by an angle θ (deg), and this inclination angle θ is set up in the finishing mill stand F, that is, the material is rolled so that the inclination angle becomes zero. Slanted flange surface 10
4 is vertically erected, there is a tension disturbance region R exerting a rolling reaction force on the flange portion 104 from a point 25 where a total of four rolls, the upper and lower horizontal rolls Fu and the left and right vertical rolls FL, are simultaneously rolled down. In this tension disturbance region R, a deformation resistance force for vertically deforming the flange part 104 acts on the flange part 104, and this deformation resistance force applies a compressive force to the rolled material 100 between the mill stand E and the finishing mill stand 1. Acts as. This compressive force is caused by the flange inclination angle θ
The larger the value, the greater the material strength of the flange surface 104, the greater the value.

However, in the conventional tension control device, the above-mentioned deformation resistance force is not taken into account, and therefore the tension control is not accurate.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a highly accurate tension control device.

[Structure of the invention]

(Means for Solving the Problems) A tension control device for an H-shaped rolling facility according to the present invention includes a universal mill stand and an edger arranged in tandem.
In an H-shaped rolling mill having a mill stand and a finishing mill stand, a first driving means for driving the roll rotation speed of the universal mill stand to a predetermined value, and a universal stand mill and an edger mill stand. Based on the rolling load and rolling reaction force of and a rolling torque calculating means for calculating the rolling torque of each of the edge mill stands, and a flange straightening rate indicating the ratio of deformation resistance when the flange portion of the rolled material is rolled on the finishing mill stand, to the shape and dimensions of the rolled material. The flange straightening rate calculating means calculates the torque deviation between each mill stand such that the tension acting on the rolled material between the mill stands becomes a predetermined value based on the calculation results of the rolling torque calculating means and the flange straightening rate calculating means. Torque deviation calculating means for calculating, speed correction amount calculating means for calculating the correction amount of the rotational speed of each roll of the edger mill stand and the finishing mill stand based on the calculation result of the torque deviation calculating means, and the speed correction amount calculating means Edge+ based on the calculation result of
- second and third drive means for driving the mill stand and the finishing mill stand, respectively.

(Function) According to the tension control device of the present invention configured as described above,
A flange straightening rate that indicates the rate of deformation resistance when the flange portion of the rolled material is rolled on a finishing mill stand is calculated by the flange straightening rate calculating means. Then, based on the calculation results of the rolling torque calculation means and the flange straightening rate calculation means, the torque deviation calculation means calculates a torque deviation between each mill stand such that the tension acting on the rolled material between each mill stand becomes a predetermined value. Ru.

Based on this calculated torque deviation, the amount of correction of the rotational speed of each roll of the edger mill stand and finishing mill stand is calculated by the speed correction amount calculation means, and based on the calculation result, the amount of correction of the rotational speed of each roll of the edger mill stand and finishing mill stand is calculated. are driven by second and third driving means, respectively.

As a result, the tension control device of the present invention has better accuracy than conventional ones.

(Example) FIG. 1 shows an example of a tension control device for an H-shaped rolling mill according to the present invention. The tension control device of this embodiment is the conventional control device shown in FIG. 3 in which a flange correction rate calculation means 8 is newly provided. This flange straightening rate calculation means 8 calculates the rate of torque (deformation resistance) acting in the tension disturbance region R shown in FIG. 2, that is, the flange straightening rate F.
t is calculated using the following equation (11).

Here, 9 is the vertical roll diameter (dragon) of stand F, and D is the flange width (mm) of material 100 on the exit side of stand U.
, θ is the flange inclination angle (degree) of the material 100 at the exit side of the stand U, and k is a constant.

Based on the calculated flange straightening rate Ft, the torque deviation ΔGBP between the mill stands E and F is calculated by the torque deviation calculating means 9 using the following equation.

ΔG' −F φΔG ・・・・・・・・・
. . . (+2) ptEp Note that ΔGBF is obtained by equation (9).

Then, based on the calculated torque deviation ΔGBF', the speed correction amount ΔNF of the mill stand F is calculated by the speed correction amount calculating means 10 using the following equation.

ΔN cabinet g ・ΔG' ・・・・・・・・・
・・・・・・・・・(13) F F
EF where gF indicates control gain (rpm/kg-m).

The electric motor 3F is controlled by the drive device 5 based on the speed correction amount ΔNp obtained in this manner, and the tension between the mill stands E and F is controlled to a predetermined value. In addition, mill stand E is controlled in the same manner as before,
The tension between mill stands U and E also becomes a predetermined value.

As described above, according to this embodiment, tension control is performed in consideration of deformation resistance, so tension control can be performed with higher precision than in conventional tension control devices.

〔Effect of the invention〕

According to the present invention, tension control can be performed with higher precision than conventional ones.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the construction of an embodiment of a tension control device according to the present invention, and FIGS. 2(a) and 2(b) show a front view and a plan view of a material being rolled in a finishing mill stand. FIG. 3 is a block diagram showing a conventional tension control device. U... Universal mill stand, E... Edger mill stand, F... Finishing mill stand, 2U,
2E... Load detector, 3U, 3E, 3F... Electric motor, 5U, 5E, 5F... Drive device, 6... Memory device, 7... Rolling torque calculation means, 8... Flange Correction rate calculation means, 9... Torque deviation calculation means, 10...
Speed correction amount calculation means, 100...material.

Claims (1)

[Scope of Claims] In an H-shape rolling facility having a universal mill stand, an edger mill stand, and a finishing mill stand arranged in tandem, the rolling speed of the roll of the universal mill stand is set to a predetermined value. a first driving means that drives the universal mill stand, and a rolling torque of the universal mill stand immediately after the rolled material is bitten by the universal mill stand, based on the rolling load and rolling reaction force of the universal stand mill and the edger mill stand. , and rolling torque calculating means for calculating the rolling torque of each of the universal mill stand and the edger mill stand when the rolled material is bitten by the edger mill stand, and a flange portion of the rolled material is a finishing mill. a flange straightening rate calculating means for calculating a flange straightening rate indicating a proportion of deformation resistance when rolled on a stand based on the shape and dimensions of the rolled material; and a calculation result of the rolling torque calculating means and the flange straightening rate calculating means. torque deviation calculation means for calculating a torque deviation between the respective mill stands such that the tension acting on the rolled material between the mill stands becomes a predetermined value based on the calculation result of the torque deviation calculation means; speed correction amount calculation means for calculating the correction amount of the rotational speed of each roll of the finishing mill stand; and second and second speed correction amount calculation means for driving the edger mill stand and the finishing mill stand, respectively, based on the calculation results of the speed correction amount calculation means. 3. A tension control device for an H-shape rolling facility, characterized in that it is equipped with the following drive means.