JPH0472604B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a rolling stand that performs rolling in a first direction in a cross section perpendicular to the feeding direction of a rolled material made of a bar or a wire rod; 1
and rolling stands that carry out rolling in a direction perpendicular to the direction of The present invention relates to a rolling control device that controls rolling reduction and tension.

[Technical background of the invention and its problems]

Generally, a bar or wire is rolled by passing it successively through a plurality of rolling stands equipped with slotted rolls. There are a wide variety of hole shapes for this type of rolling mill roll, depending on the type of product.
Examples include diamond, square, hexagonal, oval, and round shapes. Products with cross-sectional shapes corresponding to these hole shapes are formed into products with final cross-sectional shapes by sequentially passing billets as rolling materials through rolling stands equipped with rolls of predetermined hole shapes. In this case, rolling using grooved rolls mainly involves three-dimensional deformation, and rolling is performed sequentially in a direction perpendicular to the cross section of the material to be rolled, so it is similar to rolling of plate materials. Unlike rolling, which mainly involves two-dimensional deformation, it cannot be said that sufficient theory has been established to accurately calculate various rolling characteristic values including plastic deformation of the rolled material, and rolling setting calculations and The rolling control technology based on this technology is a technical field that requires further improvement in the future.

As mentioned above, rolling with grooved rolls mainly involves three-dimensional deformation, and it is natural that the dimension in the direction perpendicular to the rolling direction (hereinafter referred to as the width direction) must be considered at the same time. . However, when rolling bars or wire rods with slotted rolls, the rolling mill configuration is complicated, such as stands for both directions perpendicular to each other being arranged alternately, and the rolling rolls incorporated in the rolling stands are difficult to roll. Unlike sheet rolling, active dimensional control with a high level of control is rarely carried out due to the complexity of the hole shape, etc., and further improvements are desired in terms of product quality. . If you simply perform known rolling control and tension control, even if the dimensions in the rolling direction are as good as those for plate materials, the dimensions in the width direction can be controlled by taking into account the large metal flow in the width direction that accompanies the rolling operation. This is not necessarily a guarantee. In other words, when dimensional control in the rolling direction is implemented, the dimension in the width direction also varies depending on the amount of reduction, roll gap, tension, etc. This makes it difficult to guarantee the dimensional accuracy of rolling mills that manufacture bars and wire rods. be.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a rolling control device that can simultaneously control dimensions in the width direction as well as in the rolling direction at the same level.

[Summary of the invention]

In order to achieve the above object, the present invention provides a rolling control device as described at the beginning, in which a dimension H in the rolling direction of a rolled material after rolling by an i-1st rolling stand in the preceding stage with respect to an i-th rolling stand is provided. a first dimension detecting means for detecting _i-1 , a second dimension detecting means for detecting a dimension B _i-1 in a direction perpendicular to the rolling direction of the rolled material, and the i-th rolling stand. a third dimension detection means for detecting the roll gap S _i of the above, a tension detection means for detecting the tension t _i of the rolled material between the i-1st and i-th rolling stands, and each of the dimension detection means; Therefore, the deviation ΔH _i-1 from each target value of each dimension detected,
Find the sum of the amounts obtained by multiplying ΔB _i-1 and ΔS _i by the influence coefficients α, β, and γ on the exit side dimensions of the i-th rolling stand, respectively, and add this sum to both the i-1 and i-th rolling stands. Influence coefficient δ of the tension of the rolled material between the rolling stands t _i on the exit side dimension of the i-th rolling stand
The value obtained by dividing by - (α・ΔH _i-1 +β・ΔB _i-1 +
The present invention is characterized in that a means for correcting the tension of the rolled material t _i by γ·ΔS _i )/δ is provided.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention.
Regarding the i-1st rolling stand (hereinafter referred to as #i-1 stand), a hole-shaped roll 1 having a predetermined hole shape, a load detection load cell 2, a drive motor 3, a tachometer 4, and a tachometer 4. A speed control device 5 is provided to control the speed of the drive motor 3 so that the detected rotational speed matches the target speed given by the computer 200. A dimension gauge 6 for measuring the dimensions of the material to be rolled 100 is disposed on the exit side of the #i-1 stand. Regarding the i-th rolling stand (hereinafter referred to as #i stand), a grooved roll 11, a load cell 12, a drive motor 13, a tachometer 14, and a speed control device 1.
5, and a dimension meter 16 for measuring the exit side dimensions,
The #i-1 stand is provided with a rolling down device 17 and a rolling down control device 18, which are not shown. The calculator 200, which is provided in common in both stands, performs various calculations based on the input signals from each detection end device, that is, the load cells 2, 12, the tachometers 4, 14, the dimension meters 6, 16, and the setting device 300. The target speeds of the drive motors 3 and 13 are calculated and given to the speed control devices 5 and 15, and a reduction control signal is given to the reduction control device 18.
In the illustrated case, the #i-1 stand is a rolling stand (horizontal stand) provided for rolling in the horizontal direction, that is, the width direction, and the #i stand is a rolling stand (vertical stand) provided for rolling in the vertical direction. The rolling direction for one is the non-rolling direction, that is, the direction of metal flow for the other, and conversely, the direction of metal flow for one is the rolling direction for the other. In a relationship.

Although the present invention can be applied to any rolling stand, the case where the present invention is applied to the #i stand will be described in detail below.

In the apparatus shown in FIG. 1, the #i stand has a load cell 12, a dimension gauge 16 (detects dimensions in the rolling direction after rolling), a rolling device 17, a rolling control device 18, and a computer 200 to control dimensions in the rolling direction in accordance with the prior art. It will be done. The key point of the present invention is that, in parallel with this dimensional control in the rolling direction, dimensional control is performed in the width direction, that is, in the horizontal direction, perpendicular to this in the same stand. Now, the dimensional deviation of the #i-1 stand in the exit side rolling direction (=actual value - target value; the same applies hereinafter) is ΔH _i-1 , and the dimensional deviation of the #i-1 stand in the exit side width direction is ΔB _i-1 , ΔS i is the roll gap deviation of stand #i, Δt _i is the tension deviation of the rolled material between stand #i-1 and stand _#i , and the influence coefficient of each of the above deviations on the exit side dimension in the width direction of stand #i is Letting α, β, γ, and δ respectively, the width direction dimensional deviation ΔB _i on the exit side of #i stand is: ΔB _i = α・ΔH _i-1 +β・ΔB _i-1 +γ・ΔS _i +δ・Δt _i ... …(1) becomes. In order to achieve highly accurate dimensional control in the width direction in #i stand, it is sufficient to set ΔB _i =0 (2).

In formula (1), ΔH _i-1 and ΔB _i-1 are the dimensional deviations in the rolling direction and width direction after rolling by the #i-1 stand on the exit side of the #i-1 stand, and the magnitude of these deviation values is #i-1 It depends on the rolling history and control accuracy up to the exit side of the stand. These dimensional deviations ΔH _i-1 and ΔB _i-1 are determined by calculating the difference between the dimensions in the rolling direction and the width direction measured by the dimension meter 6 and each target value set by the setting device 300 using the calculator 200. It can be obtained by calculating

Transforming equation (1) and substituting equation (2) into it, we get the following equation
Equation (3) is obtained.

γ・ΔS _i +δ・Δt _i =ΔB _i −(α・ΔH _i-1 +β・ΔB _i-1 ) =−(α・ΔH _i-1 +β・ΔB _i-1 ) ……(3) (3) Since the right side in the equation is known, ΔS _i and Δt _i included in the left side of equation (3) become a problem in order to set the width direction dimensional deviation ΔB _i on the exit side of the #i stand to ΔB _i =0.

On the other hand, in the apparatus shown in FIG. 1, when the dimension control in the rolling direction of stand #i is implemented, the first term on the left side of equation (3) is also known, and only Δt _i remains. Therefore, by transforming equation (3), Δt _i =−(α・ΔH _i-1 +β・ΔB _i-1 +γ・ΔS _i )/δ (4) is obtained. The #i stand performs back tension, that is, #i-1 while controlling the dimension in the rolling direction.
By correcting and controlling the tension t _i between the stand and the #i stand using Δt _i determined by equation (4), it becomes possible to simultaneously control the dimension in the width direction. Controlling the tension between stands itself is a conventional technology;
In FIG. 1, this can be realized by controlling the rotational speed of the grooved roll 1 or 11 using the speed control device 5 or 15. When performing Δt _i correction by controlling the rotational speed of the grooved roll 1 of stand #i-1, the speed of the upstream stand is continuously controlled, and the rotational speed of the grooved roll 11 of stand #i is controlled. By controlling Δt _i
When performing correction, by continuously controlling the speed of the downstream stand, disturbances such as fluctuations in tension between other stands can be suppressed, and stable control of the #i stand's dimensions in the rolling direction and width direction can be achieved at the same time. can do. Note that the #i stand may be an intermediate stand or a final stand.

#i If the dimension control in the rolling direction of the stand is completely guaranteed, the third term on the right side of equation (4) becomes ΔS _i =0
In this case, the following equation (4A) can be used instead of equation (4).

Δt _i =−(α・ΔH _i-1 +β・ΔB _i-1 )/δ
(4A) As described above, according to the present invention, the control operation amount is determined based on equation (1), and the dimension in the rolling direction and the dimension in the width direction can be controlled simultaneously.

FIG. 2 shows the functions of the computer 200 in FIG. 1 in detail, particularly the part 210 that calculates Δt _i . The rolling direction dimension H _i-1 and the width direction dimension B _{i-1 of the rolled material 100 after rolling on stand #i-1} are detected by the dimension meter 6, and the delay device 21
is input to the computer 210 via the . delay device 2
1, the dimensions of the material to be rolled 100 6
Control is performed to match the timing when the detected position reaches the roll bite of the #i stand hole type roll 11. Detection dimensions
B _i-1 and H _i-1 are target values B _(i-1)0 and H _{( i-1)0} is input to adders 201 and 202, where dimensional deviations ΔB _i-1 and ΔH _i-1 are calculated according to the following equations.

ΔB _i-1 =B _(i-1)0 −B _i-1 ……(5) ΔH _i-1 =H _(i-1)0 −H _i-1 ……(6) This dimensional deviation ΔB _{i- 1} , ΔH _i-1 , setting device 304,
The aforementioned influence coefficients β, α set by 305
The second and first terms on the right side of equation (1) are calculated by multiplying by multipliers 204 and 205.

β・ΔB _i-1 ...(7) α・ΔH _i-1 ...(8) The roll gap S _i of the hole-shaped roll 11 of #i stand is detected by the roll gap detector 31, and this detected value and the setting device From the #i stand target gap S _i0 set by step 303, the adder 203 calculates the gap deviation ΔS _i according to the following equation (9).

ΔS _i =S _i0 −S _i ...(9) This gap deviation ΔS _i is multiplied by the above-mentioned influence coefficient γ set by the setting device 306 by the multiplier 206, and the right side of equation (1) is obtained. The third term γ・ΔS _i is found.

α・H _i-1 , β・
B _i-1 and γ・S _i are added by adder 207, and the sum is further multiplied by −1/δ, which is the reciprocal of the influence coefficient set by setter 307 with a negative sign. By multiplying by the device 208, Δt _i in equation (4), that is, the necessary control amount of the tension between the #i-1 stand and the #i stand is calculated. In order to realize this Δt _i , the computer 211 calculates the necessary rotational speed control amount of the hole-shaped roll 1 of the i-1 stand, and the rotational speed of the drive motor 3 of the #i-1 stand is controlled via the speed control device 5. is controlled. In addition,
A calculator 210 surrounded by a broken line calculates the initial stage target values B _(i-1)0 , H _(i-1)0 and S _i0 , and each influence using the measured value by the dimension meter 16 installed on the exit side of the #i stand. It is also possible to learn the coefficients α, β, γ, and δ.

In the above embodiment, two stands, #i-1 stand and #i stand, were explained as examples, but the present invention can be applied in combination by appropriately selecting any stands from #i stand to the final stand. This makes it possible to further improve control accuracy. Furthermore, if the rolling dimension of the #-1 stand, for example, is calculated using a known gauge meter method, the dimension meter 6 can detect only the width direction dimension and carry out similar dimension control. Although the cross-sectional shape of the material to be rolled 100 is indicated by hatching in FIG. 1 in the series of oval hole type/circular hole type,
The present invention is not limited to this, but can be applied to any series of hole shapes such as rectangular.

〔Effect of the invention〕

As described above, according to the present invention, in a continuous rolling mill that manufactures bars or wire rods with a predetermined cross section by rolling materials to be rolled in alternating orthogonal directions, dimensional control in the rolling direction and at the same time, Dimensional control in the direction perpendicular to the rolling direction can also be guaranteed with high accuracy, which can greatly contribute to improving the quality of bars and wires by rolling.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a block diagram showing more detailed functional blocks. 1, 11... Hole roll, 2, 12... Load cell, 3, 13... Drive motor, 4, 14... Rotation speed meter, 5, 15... Speed control device, 6, 16
...Dimension meter, 17... Rolling down device, 18... Rolling down control device, 21... Delay device, 31... Roll gap detector, 100... Rolling material, 200, 21
0,211...Calculator, 300...Setting device.

Claims (1)

[Scope of Claims] 1. A rolling stand that performs rolling in a first direction in a cross section perpendicular to the feeding direction of a rolled material made of a bar or wire, and a second direction perpendicular to the first direction in the cross section. Rolling stands for rolling are arranged alternately, and rolling in both directions is performed alternately to control the reduction and tension of each rolling stand so that the material to be rolled has a predetermined cross-sectional shape and a predetermined cross-sectional dimension. In the rolling control device, for the i-th rolling stand, the i-
a first dimension detection means for detecting a dimension H _i-1 in the rolling direction of the material to be rolled after rolling by the first rolling stand; and a dimension B _i-1 of the material in the direction perpendicular to the rolling direction of the material to be rolled; second dimension detection means for detecting the roll gap S _i of the i-th rolling stand;
Tension of the material to be rolled between the two rolling stands
The tension detection means for detecting t _i and the deviations from the respective target values of each dimension detected by the dimension detection means ΔH _i-1 , ΔB _i-1 , and ΔS _i are determined by the i-th rolling, respectively. The sum of the amounts obtained by multiplying the influence coefficients α, β, and γ on the exit side dimensions of the stands is determined, and this sum is calculated as i of the rolled material tension t _i between the i-1th and i-th rolling stands. The value obtained by dividing the influence coefficient δ on the exit side dimension of the th rolling stand - (α・
A rolling control device comprising means for correcting the tension of the rolled material t _i by ΔH _i-1 +β·ΔB _i-1 +γ·ΔS _i )/δ.