JPS5961514A - Speed controlling device of multi-strand continuous rolling mill - Google Patents

Abstract

PURPOSE:To control highly accurately a tension imposed on a rolling material, and to improve the quality of a rolled product, by detecting the variation of tension between stands at the time of starting rolling of the succeeding material, and providing a means for compensating the speed of a rolling roll at each stand in accordance with the variation of tension. CONSTITUTION:The variation of rolling torque of the (i)th stand corresponding to the variation of tension between the (i)th and (i-1)th stands caused by the start of rolling of the (i)th stand is calculated basing on the outputs of rotating speed detectors 4i, 4i- 1. A roll speed correcting value of the (i)th stand is calculated by multiplying said calculated value by a proportional control gain of the (i)th stand. Further, the variation of rolling torque of the (i+1)th stand corresponding to the variation of tension between the (i)th and (i+1)th stands is calculated to multiply it by the proportional control gain. Moreover, a roll speed compensating value of the (i+1) stand is obtained by adding the roll speed compensating value of the (i)th stand and a compensating value obtained from the rotating speeds of rolls at the (i)th and (i+1)th stands. Both of these compensating values are calculated by a calculator 5, and the result is added to a control signal to output the sum total.

Description

[Detailed description of the invention] [Technical can type according to invention] This invention is a rolling method for rolling a bar needle 1 or wire phase into multiple strands.
7j4j Regarding speed control device 1 possible.

[Backhanded technology and its problems]

Steel bars and wires I are continuously rolled by multiple rolling mills equipped with slotted rolls.

In general, when rolling steel bars or wire phase, tandeno mills and mills, which are constructed with a variety of hole types, are used. Typical hole-shaped rolls include taiya-hole type, nuqua-hole type, hexa-hole type, mebal-hole type, and round-hole type.
is known, and the billet as a purple phase is continuously rolled by successively passing through these holes to form the final product, such as a steel bar or wire rod. L1=extension by the grooved roll is mainly three-dimensional deformation.

On the other hand, in the case of plate rolling, t1 is used to subtract various rolling characteristic values.
Equation 11 (channel rolling theoretical equation) mainly involves two-dimensional deformation.

Comparing these two, the theoretical consideration of three-dimensional deformation is still insufficient compared to the case of two-dimensional deformation, and further improvements in rolling design and control are needed in the future. It is necessary to divide

In the conventional rolling of steel bars and wire rods, there is only one unrolled phase, and in this case, a well-known method is used to control the tension of the unrolled phase. For example, current memory method.

The rolling torque memory method, rolling load Tj/rolling torque memory method is used, and 6i'1, which is allowable for current steel bars and wire paulownia, is used.
It has achieved a certain level of effectiveness in improving the quality and accuracy of 61i-meters.

However, it cannot be denied that it is still technologically inferior to IE technology, which maintains quality by controlling the rolling of temporary phases, although it has several advantages over the plastic deformation mechanism. In this way, in rolling steel bars and wire rods, two or more unrolled phases are simultaneously rolled using one H" rolling roll in order to improve productivity, even though the precision is lower than that of temporary phase rolling. In some cases, multi-strand rolling is carried out. In such multi-strand rolling, rolling rolls having one or more grooves are used.

Although this type of multi-strand rolling is useful for improving productivity, the factors that influence rolling are complex and control uncertainties are added, making it inferior in terms of quality compared to rolling a rolled material made of lumber only. The quality is inferior to −C u: 1; x k+'
I can't do it.

[Purpose of the invention]

The object of the present invention is to provide a speed control device for a continuous rolling mill that can measure the Ipf of rolled products produced by semi-strand rolling. Rolling is started at stands with trailing materials at I' and 11' (to provide a speed control device having a +! mechanism that detects changes in tension between stands of live fish and corrects the speed of the rolling rolls. .

[Summary of the invention]

In order to achieve the above object in this invention, a roll freezing control device for controlling the rotational speed of the rolling rolls of each stand includes a rotation speed detector for detecting the rotation of the rolling rolls; , a tension setting device that keeps the tension between the stands constant at the desired level, and a front rotation speed detection R knee).
Force setting lip: In response to the output C of 1, the roll speed flt
I plan to send 71 system 11111 Satsuki to Misaki device;
.

1: Pa-Toru-U-plane-1 In a speed control device for a multi-strand continuous rolling mill that rolls a number of bales of rolled material stretched between the stands in parallel with the same rolling roll.

The change in the rolling torque of the first stand corresponding to the change in tension between the first stand and the upstream 1-l stand when the trailing rolled material starts rolling at the first stand (1 is an integer) is expressed as the first stand. The calculated value is calculated based on the output of the front rotational speed detector provided in the first stand, and this calculated value is multiplied by the proportional control gain of the first stand to obtain a roll speed correction value ΔN1 for the rolling roll of the first stand. and a means of calculating.

The rolling torque change of the i+/stand corresponding to the tension change between the first stand and the downstream i+/stand due to the rolling of the trailing rolled material being started at the first stand is expressed as the i+
/ Calculated based on the output of the rotational speed detector provided in the stand, and this calculated value is multiplied by 97% 1 + t stand proportional control gain.

Further, the first stand and the first
+T stand rolling roll rotation speed Ni.

Adding the correction value calculated from Ni+/n, the roll speed correction value ΔNj+ for the rolling roll of the 1,000th/stand
/ is provided in the subtracter.

A feature is that the two roll speed correction values ΔNi, ΔNi+/ are outputted after adding γP to the side portion 1 signal.

The present invention will be described in detail below based on examples.

[Embodiments of the invention]

The basic rolling characteristics when If rolling of the succeeding material is started in multi-dimensional rolling will be described.

2nd section, Figure 1 shows two rolled t41. ．． i is equal to 11"i F[: This is a schematic diagram of an example of one strand rolling in which the rolling is done k]. Figure 1 (A) Shin17 * 71-”Tohe →-/Stand V
This shows a state in which continuous rolling has been carried out across C, and rolling of the rolling material by the i-stand has not yet started among the materials to be rolled.

Figure 1 (Season d: time has passed since the first (A), the transition material is 1 stand, etc. 1~.+1 stand hole type roll)': In li, the leading side l and the traveling phase λ The 1774-style diagram shows the state in which the and are rolled at the same time.

Here, Gi and Gi+/ shown in the figure indicate the rolling torque of +i and "i+/ stand, respectively, before the trailing material does not reach +1 stand. Also, T1 indicates the rolling torque of +1 stand and +1+/ stand, respectively. Figure (C) shows a measurement chart using a pen recorder, showing changes in rolling torque and inter-stand tension over 9 hours.

tl on the horizontal axis indicating time indicates the time when rolling material λ starts rolling at the stand. When the trailing material starts rolling at +1 stand, the rolling torque of +l+/, which is the downstream stand of +1 nukund, and X stand will change from G1+/ to G1
+/+ΔGi+/, and the inter-stand tension between the Saki stand and +i+/Nukundo becomes Ti1dr1+ΔT1.

In other words, at the point when rolling of the trailing phase co starts on stand 1, the rear tension T1 changes by ΔTi, and the rolling torque also changes by ΔGi+l, even though the i+/stand is still rolling only the leading material l. Make a change.

At this time, the +1 stand changed from the l strand rolling state to the cost strand rolling state, so the rolling torque changed from G1 to 0.
1+ΔG1. This ΔG1 also includes the effect of changing the number of rolled materials from one to two.

At this time, the stand adjacent to the upstream stand is t) +1-/
The tension between the stand and the +1 stand also changes.

In this way, in Costland rolling, the stand (
In FIG. 1, there is a sign that the H/extension torque and tension of the upstream gjll and downstream stands of the Nukund change simultaneously due to the following material being placed in the +1 stand (in FIG. 1).

The above savings E11. l is not limited only to the case of Costland rolling, but it is determined that the preceding material/and the following phase yu are each in a state where not only l wood but more than λ of pressed abrasive materials have already been rolled. The same applies to multi-strand rolling of three or more strands.

Next, based on the characteristics of the multi-strand rolling explained above, the basic principle for controlling the tension between the stands when rolling of the rolling phase is started will be explained.

Figure 1 shows ≠i-/, +
1. This is a schematic diagram showing the rolling pattern in 3 stands of ``i+/''. In the first figure (A), the leading material l is at ≠1+/nutand, and the succeeding material l has not yet reached 1 nutand. The state is +1-/, ″#′1. φi
The rolling torque of each stand of +/ is Gi-/, Gi, G
i+/.

Figure 2 (B) shows the state where rolling has started with one stand of trailing material λ, and at this time +1-l, +1°+1
The rolling torque of each stand of +l is G'i-/, G'
i.

It becomes G’i+/.

Here, the torque change occurs between Fig. 1 (A) and (19) because the trailing material is stopped at 4'1 nukundo and the rolling torque G1 becomes G'i at the same time as ◆i-/ and +1 stand. This is due to the simultaneous change in the tension between Q and +1 and 11+l stands.The rolling torque change ΔGi+ of +i+/nukund due to the change in tension between the +1 stand and the "i+/stand" caused by the arrival of the trailing material - on the +1 stand. /
is ΔGi+/-Gi+/-G'i+/ (1)≠. The tension between the 1 stand and the ``i+/ stand is +1 + l the number of rotations N of the pressure horse roll R1-1-/ of Nutando.
1+/ by ΔNi+/. That is, ΔNi+/−gi+/·Δ01+/ (,2) is established. Here, g1+/represents the proportional control gain of "i+/stand."

Next, the rolling torque change of +1 stand is 9■
+1 stand rolling torque increase due to start.

This is the sum of the change in front and rear tension of the 11th stand caused by the trailing phase rolling start, but ≠i-i stand's rq't = +1- which caused the torque change ΔG1+t.
/ Corresponds to the tension change between stand, A and 1 stand''
l! '1 Stand pressure 9JL Torque change Δa1 (i, -
/)teeth.

ΔGi (j-/), wi+ΔGi-/-wi-/-θ
(3) satisfies the 1-da-1 equation. Here wl and w
i-/ are the angular velocities of rolling rolls F1 and Fti-/ of stand 1 and stand ≠1-/, respectively. Here, since Δa1-t=a1-t-a'1-t (g) holds true, from equation (3) and (qj equation), Wi-
/ΔGi(i-/)---(G1-7-a'1-/)
(s)1 is derived. The tension between the +1 stand and the "i-/stand" is controlled by changing the rotational speed N1 of the +1 stand by ΔN1, ie.

ΔNi=gi·Δa1(1−/) (X) holds true. Here, gl is a proportional control gain of +1 stand.

In the case of multi-strand rolling, when the trailing material reaches the +1 stand, the longitudinal tension of the stand changes simultaneously. Tension control in multi-strand rolling should take this basic characteristic into account.
(, 21 and (6) must be considered at least simultaneously.

Next, specific embodiments based on the basic principle explained above will be described. FIG. 3 is a block diagram showing an embodiment of a speed control device for a multi-strand continuous rolling mill according to the present invention. In the configuration diagram of FIG. 3, only the +1-/, "i, +i+/ stands are shown.

The rolling torque G1 at the +1 stand can be calculated using the following formula: 0 Here, V is the drive force that drives the rolling rolls. Iih motor pressure m of motor 3, J represents motor current 1, Pbm root resistance, and β, r, and δ represent constants, respectively. The first right-hand side of equation (7)
The second term indicates the motor torque, the second term indicates the acceleration/deceleration torque, and the third term indicates the loss torque.

Although a speed reducer is not shown in the configuration diagram of FIG. 3, even if a speed reducer is provided, the rolling torque and motor torque necessary for rolling the rolled material can be easily determined.

This gift will give you both 1 from the reducer specifications (reduction ratio)! You can do W. There is also a certain relationship between the roll angular velocity W] and the motor rotation speed 1.11, as described above. Rabbit,
In the configuration diagram of FIG. 3, rolling rolls P (pl-7, ni, p
i+/) and drive motor 3(, yl-t.

3t, 31-1-/) is driven, and the voltage and current of this drive motor 3 are controlled by the speed control device 1 (11-1-/).
゜71,. 71+l), and on the other hand, the output values of the drive motor 3, such as the rotation speed, voltage, and current value, are detected by the speed detector, and according to the above-mentioned equation (7), the rolling torque of each stand is determined by Calculate.

The rotation speed of the drive motor 3 is controlled via the angular velocity control device 7 so that the inter-stand tension value is set in advance by the tension setting device 6.

Next, speed control will be explained in more detail.

The rolling torque of each stand before and after the trailing material reaches +1 stand Gi-/, Gi, Gi+1. G'i-/,
G'i.

G'i+/ is calculated by the computer S according to equation (7) and stored.

Further, the subtraction machine 5 calculates ΔN j, 10/ from equations (1) and (2), and ΔN1 from equations (5) and (A).

In multi-strand rolling, the longitudinal tension of the stand (+1 stand) where the trailing material starts rolling changes simultaneously, and therefore, in multi-strand rolling, it is necessary to control the longitudinal tension at the same time. In order to control this longitudinal tension, the rotational speeds of the stand (4p1 stand) and the downstream stand (14-/stand) are controlled.

Here, the +1 stand rotational speed control amount is ΔN1 calculated by equation (6), and the i+/+1 stand rotational speed control amount is ΔN i + calculated by equation (,2).
The total control amount ΔN1+7 is obtained by adding the rotation speed control tTI amount Δold of the temple 1 stand to /. This total control h111 amount ΔN□+7 is.

ΔN1 stone re]7=ΔNi+/+-Kai1-1-/(g)1 I can express it clearly.

At this time +1,000/adjacent downstream stand temple i + λ of Nutando
The amount of change ΔN]+2 in the rotation speed of the rolling rolls on the stand is.

I force myself. Here N:14-. 2 is "i+", the FF spreading roll rotation trace of 2 stands is 1 μ.Furthermore, the downstream stands below +1+3 are similarly controlled.

Figure 1 e'', ≦4'11.7[;! 1 shows the existing calculator S
1 shows the internal structure of . From equation (1), (g
Based on the output value from the speed detector ≠1,000l stand and +1 stand, roll speed correction value ΔN1 for the speed control device 7 provided in the
and ΔN1+/ are calculated.

One roll speed correction value ΔN calculated in this way
i, ΔNi+/ and d are added to the control signal predetermined by the tension setting device B and given to the speed control device 7. ) is compensated for.

〔Effect of the invention〕

As described above in detail based on the embodiments, in the present invention, during continuous rolling of multiple strands of steel bars or wires, when rolling of the succeeding material is started on the stand and the rolling state changes, the stand and its downstream stand rolling roll 1rJ
Since it is configured to control the first gear shift at the same time, the tension applied to the pressured residual phase can be controlled with high precision regardless of whether it is a leading phase or a trailing phase. It has the advantage that it can be made uniform.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams for clarifying the basic characteristics of multi-strand rolling. 1 is a diagram showing the internal configuration of a computer used in the invention. l. Leading material 1.2... Trailing material, da... Speed detector, j.
i-174: machine, 6 tension setting device, 7... roll speed f
tt control system. Applicant's agent Kiyoshi Inomata Figure 1

Claims (1)

[Claims] 11 devices on the roll speed side for controlling the rotational speed of the rolling rolls, a rotational speed detector for detecting the rotational speed m of the rolling rolls, and a tension setting device for setting the tension between the stands to a desired value. and a three-way machine that sends a control signal to the roll speed control device in response to the output of the 11th rotation degree detector and the tension setting device, A plurality of pine abrasives were rolled in parallel with a concave rolling roll 9J1. Speed control of multi-strand continuous rolling mill TII 4! At j lt'i, the trailing pressurized abrasive starts rolling at the first stand (1 is an integer), and the first stand corresponds to the tension change between the first stand and the upstream (ill th -/stand). The rolling torque change of is calculated based on the output of the rotational speed detector provided in the first stand and the first stand, and
Means for calculating the roll speed correction value ΔN1 for the rolling roll of the first stand by multiplying the proportional control gain of the stand, and the first stand and the downstream @ The rolling torque change of the 1st +/stand corresponding to the tension change between the 1+l stands is calculated based on the output of the rotational speed detector provided in the 1st +/stand, and the proportional control of the 1st +/stand is applied to this calculated value. Multiply the gain and further calculate the roll speed correction value Δ
N1 and the correction value calculated from the rolling roll rotational speeds Ni, Nj, +/ of the first stand and the first +/stand calculated from the detection value of the rotational speed detector, and z14-7Nkund. Roll speed correction value ΔN for the rolling roll 1. + / is provided in the subtracter, and the two roll speed correction values ΔNi, ΔNi
A speed control device for a multi-strand continuous rolling mill, characterized in that +/ is added to the control signal and output.