JPS60191613A - Rolling device - Google Patents

Abstract

PURPOSE:To eliminate difficulty in control which arises when rolling load is the same by providing means for restraining the movement of work rolls contributing to formation in the final pass and the pass before said final pass. CONSTITUTION:Rolling load P1 (=P2) of the 1st pass and 2nd pass and rolling load P3 of the 3rd pass are detected by load cells 2, 3 and are stored in memories 4 and 5 when passage of a material 1 to be rolled ends. The rolling loads in this stage are designated respectively as P10, P30. An operational amplifier 9 calculates a fluctuating component DELTAP3 of the rolling load by using a fluctuating component DELTAP1 of the rolling load, the mill constant M set in the amplifier 9 and the rigidity constant MS of a restraining part S for roll chock. The calculated value DELTAP3 is now designated as DELTAP3cal. The output value DELTAP3 by an adder 7 is the actually measured value of the fluctuating component of the rolling load in the 3rd pass and the deviation DELTAP between said value DELTAP3 and the value DELTAP3cal is determined by an adder 8. A rolling down device 11 is controlled via a rolling down control device 10 so as to attain the deviation value DELTAP=0.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rolling apparatus that performs continuous rolling of one stand and multiple buses.

[Technical background of the invention]

A rolling device in which an L stand is equipped with three or more work rolls to form two or more rolling passes, and the material to be rolled is continuously passed through these rolling passes to carry out rolling is generally referred to as an L stand multi-pass mill. However, such a rolling mill can significantly improve the productivity of one stand and can also contribute to making the rolling process more compact. On the other hand, multi-stage mills such as ψ-stage mills, 6-stage mills, and Sensima, which are conventional temporary phase rolling mills, are 1-stand, 1-pass rolling mills.

Fig. 1 shows a basic conceptual diagram of a conventional l-stand multi-pass mill. The example shown in Figure 1 is for l stand! It is a l-stand 3-pass mill that can perform 73 passes at the same time, and the rolled material l
rolling by work rolls WRl and WR,2 (hereinafter referred to as /pass), rolling by work rolls WRJ and ViR3 (hereinafter referred to as 1 pass), and work rolls WRJ and WRF.
The thickness of the plate on the entry side is increased by simultaneous rolling (hereinafter referred to as 3 passes).

The thickness of the board on the exit side becomes thicker. Note that the direction in which the rolled material 1 moves is indicated by an arrow.

Each work role VLR/, WR, 2, WI
(J, WRGC is rollch "Myri wal, wc, z,
It was reprinted in WOJ and WOF, and is known for being able to move vertically in the direction of rolling down the material to be rolled. Furthermore, work roll WR/
and WR≠)L.

A pull-up roll BR/ and BR,2 are provided, and are attached to the roll counters BO/ and Bc2, respectively.

In the following explanation, as shown in Fig. 1, the work roll will be explained as an example of an l-stand 3-pass mill that has a φ configuration and can perform three passes at the same time, but even if the number of passes is two or more, There is no problem because the same way of thinking can be applied to all of them.

Here, in a rolling apparatus as shown in Fig. 1, the rolling load for one pass is p, , the rolling load for one pass is P! , the following relational expression holds true if the rolling load of three passes is Ps.

P, +-pt-F, (1) That is, the rolling load of each pass is the same. In this manner, the conventional rolling apparatus is configured such that the rolling load is the same for each pass.

[Problems with background technology]

In this way, if the rolling loads applied to each rolling pass can only have the same value sb, the following problems occur.

■ When rolling AGO is performed, load fluctuations occur due to the rolling reduction control, but this load fluctuation is not applied to all rolling passes with the same value, and the plate thickness of the l pass and λ bus #3 pass is also changed at the same time. It will fluctuate. Therefore, it is extremely difficult to control the exit side plate thickness so that it is always kept at a constant value.

(2) Furthermore, even if it were possible to control the entry tension, exit tension, and interpass tension, this would result in fluctuations in the rolling load, resulting in the same results as described above.

As mentioned above, CD is a typical example of a problem in plate thickness control in an 1-stand multi-pass mill.The cause of this problem is that the rolling load of each rolling pass is kept at the same value.

[Purpose of the invention]

An object of the present invention is to provide a rolling apparatus that makes it possible to improve plate thickness control accuracy and maintain aperture by taking advantage of the advantages of an 1-stand multi-pass mill.

[Summary of the invention]

In order to achieve the above object, this invention provides a rolling method in which a stand is equipped with three or more work rolls to form two or more rolling passes, and the material to be rolled is continuously passed through these rolling passes to perform rolling. In the apparatus, a restraining means for restraining work rolls that are simultaneously involved in forming the final rolling pass and the rolling pass preceding the final rolling pass from moving in a direction of rolling down the rolled material; A first voltage applied to the rolled material passing through a rolling pass of
and a second rolling load separately detected.
a load detection device, and a mill constant of the rolling device and the restraining means in the detection signals of the first and d-th load variation detection devices, each of which calculates a variation in rolling load based on the detection signal from the load detection device. a device for obtaining a deviation signal by comparing a calculated value calculated by multiplying a constant value determined by the stiffness constant of the device with the detection signal of the other load fluctuation detection device; The present invention is characterized by comprising a rolling reduction control device that changes at least one of the first and d-th rolling loads so that the rolling loads become zero.

[Embodiments of the invention]

The details of this invention will be explained below based on examples.
The figure shows an example of a means for restraining the movement of the work roll in the rolling direction used in this invention. A work role W that is involved in both a certain path and
In addition to the fc mechanism that restrains the movement of RJ in the rolling direction (downward in Figure 2) and (the part shown with diagonal lines) is provided.

In addition to providing the roll chock restraining files as means for restraining the movement of the work roll W in the rolling direction, other means may be used;
In a rolling apparatus having the structure shown in the figure, it is easiest to provide a roll chock restraint section S. This roll chock restraint part sFi restrains only the roll chock WO3.

Unlike the structure of the conventional rolling mill shown in FIG. 1, in the case of the present invention shown in FIG. The load p,,p, is p, -p,...
・Q) is maintained, but in the rolling direction of 3 passes and in the relationship η < p 3, the roll chuck restraint part 8 also holds a part of the cart, so P3\p, xp, ... ( 3) The following relationship holds true. In this way, the roll chock restraint part S
By providing υ, the rolling load acting on the final rolling pass and the rolling load acting on other rolling passes become different. Here, the load received by the Roll Terrac restraint part S is P8
Then, ps-p, -p, ...... (ψ). The exit side plate thickness after 3 passes is h3- S g +" 3-h ...<s>, where M is the mill constant and M6 is the rigidity constant of the roll chock restraint part S.
It becomes M8. Here 8. is the set gap for 3 passes.

Entrance plate thickness. When rolling conditions change, such as a change in or a change in deformation resistance, the exit side plate thickness h3 also changes. If the variation of this exit side plate thickness is Δh, then the following equation is obtained. Here, from the equation ←), ΔP80ΔP3-ΔP,... (7) holds true, so by substituting this into the equation (6), we get: Since plate thickness control is achieved by eliminating fluctuations in the outlet side plate thickness, it is sufficient to control the plate thickness so that Δ b, -o ... (ri). In other words, since the following holds true, if the ratio of the deviation between the rolling load P of one pass and the rolling load Ps of three passes is controlled to be a constant value, the exit plate thickness hs of the l stand multi-pass mill will be constant. .

FIG. 3 is a schematic configuration diagram showing an embodiment of the present invention.
A load cell 3 is attached to each of the knock-up rolls BR/, BR, 2 as a device for detecting the rolling load. The load cell λ detects the rolling load P1 of 1 pass and 1 pass, and the load cell 3 detects the rolling load P1 of 3 passes.
, to detect. A memory ψ,j for uniformly storing the detection signal from load cellco. An adder 6.7 is provided.

The detection signal from the adder 6 is given to the adder r via an operational amplifier, and is compared with the detection signal from the adder 7 to produce a deviation signal. The lowering device l/ is controlled in this manner. It should be noted that the roll-down device /2 that controls the knock-up roll BR/ is configured such that a rolling load set by a setting device /g is applied via a roll-down control device 13.

Next, the operation of the rolling apparatus configured as described above will be explained.

Rolling load Pc of 1 pass and 1 pass after the rolling process is completed
(=Pt) and rolling load P for 3 passes.

is detected by each load cell node, 3, and the memory ≠
and stored in the memory 5. The rolling loads at this time are respectively PIO and P2O. During rolling, the rolling loads P 1 , P
3 is changing. Therefore, the rolling load fluctuations ΔP1+ΔP of the 1-pass and 3-pass due to variations in rolling conditions are respectively expressed by the following equations.

Δp, -p, -P, o-... (//) Δp, -p,
-p, ... (12) ΔP in the (//) formula and JP3 in the (/→ formula are calculated by the adders 6 and 7, respectively. In this way, the memory V and the adder 6 and JP3 are calculated by the adders 6 and 7, respectively. The memory j and the adder 7 each constitute a load fluctuation detection device that calculates the rolling load fluctuation.The operational amplifier is set to the aforementioned rolling load fluctuation ΔP1 and the operational amplifier 7.
C mill constant M and rigidity constant M6 of roll chock restraint part S
The calculation shown in the above-mentioned equation of Q is executed using , and the rolling load variation ΔP is calculated. This calculated value AP is now Δp,cal. The output value ΔP from the adder 7 is 3
The actual measured value of the rolling load variation of the pass l), this actual measured value ΔP
, and the calculated value ΔP.

The deviation ΔP from 01L'l can be requested from the adder r. That is, ΔP=ΔP, -Δp 3cal .=-Q3) holds true. If the rolling down device l/ is controlled via the rolling down control device 10 so that this deviation value ΔP becomes JP-0, the variation Δh3 of the exit side plate thickness shown in equation (R) becomes zero, The exit plate thickness can be controlled to a constant value. With this configuration, it is possible to control the outlet side plate thickness in the l-stand multi-pass mill with high precision while taking advantage of the advantage of the l-stand multi-pass mill, which is that a large rolling reduction value can be obtained per l-stand. becomes possible.

In addition, in FIG. 3, A shown surrounded by a dotted line indicates an arithmetic device,
B indicates a reduction control device.

Fig. 3 is a schematic configuration diagram showing another embodiment of the present invention, and the same parts as shown in Fig. 3 are given the same reference numerals.

In the example shown in FIG. μ, a load detector 1 for detecting the load P8 applied to the roll chock restraining portion 8 is installed, and the load cell 3 provided in FIG. 2 is unnecessary.

The load l detected by the load detector/S is the load that the work roll restraining portion during rolling receives via the roll chock WC3.

In this case as well, the above-mentioned formula ←) holds true, so the rolling load yj'-ps of 3 squares is P, tsup, +p8... (≠)'J-masu A,
l - Therefore, the load P6 detected by the load detector/S
The adder 16 calculates υ(1
) By performing the calculation of equation 1, it is possible to determine the rolling load P of three passes, similarly to the embodiment shown in FIG.

The lowering device l/ can be controlled by using the same structure as shown in FIG. 3 in other respects.

〔Effect of the invention〕

In this way, in the present invention, in an l-stand multi-pass mill, a means is provided to restrain the movement of the work rolls that are simultaneously involved in forming the final pass and the previous pass, and the rolling load is brought to the d level, thereby improving the rolling load compared to the conventional one. As such, it is possible to eliminate the difficulty in control that arises from the fact that the rolling load is the same regardless of the number of passes.

[Brief explanation of drawings]

Fig. 1 is a basic conceptual diagram showing the structure of a conventional l-stand multi-pass mill, and Fig. 2 is a basic conceptual diagram showing the structure of a conventional l-stand multi-pass mill.

Claims (1)

[Claims] (1) The stand is equipped with three or more work rolls.
In a rolling device that forms the above-mentioned rolling passes and performs rolling by continuously passing the material to be rolled through the rolling passes,
restraining means for restraining work rolls that are simultaneously involved in the formation of the final rolling pass and the rolling pass immediately before it from moving in the direction of rolling down the material to be rolled; first and second load detection devices that separately detect the first and second rolling loads respectively applied to the rolled material passing through the milling material; a first and a λ-th load fluctuation detection device each calculating a variation in the amount of fluctuation, and a detection signal of one of the load fluctuation detection devices is determined by a mill constant of the rolling device and a rigidity constant of the restraining means. a device for obtaining a deviation signal by comparing a calculated value multiplied by a constant value with a detection signal of the other load fluctuation detection device;
7. A rolling apparatus comprising: a rolling reduction control device that responds to the deviation signal and changes at least one of the first and second rolling loads so that the deviation signal becomes zero. G2) Claim (1) characterized in that the restraining means is a roll chock restraining part attached to a roll chock of a work roll that is simultaneously involved in forming the final rolling pass and the rolling pass immediately preceding it. rolling equipment. (3) The first load detection device includes a load detector provided in the roll chock restraint section, and an adder that adds the detection signal from the second load detection device and the detection signal from the load detector. A rolling apparatus according to claim t, 2), characterized in that the rolling apparatus comprises: