JPS60177908A - Method for changing sheet thickness during running in rolling process - Google Patents

Abstract

PURPOSE:To improve efficiency and yield by stopping the sheet-thickness control of a monitor AGC processing method by a sheet-thickness changing command and changing the sheet thickness till the final sheet thickness by a gauge meter AGC method before restarting further the sheet thickness control of each stand by both processing methods. CONSTITUTION:Load cells 14, 16, 18 and roll-opening sensors 13, 15, 17 are connected to an AGC device 12 to perform a monitor AGC and a gauge meter AGC. When a sheet-thickness changing command of the final sheet thickness monitored by an X-ray wall-thickness gauge 20 is outputted, the device 12 outputs a rolling- reduction changing command to stop the sheet-thickness control of monitor AGC. The sheet thickness at the outlet side of a stand R3 is changed to the gauge meter AGC processing to change the sheet thickness, and the sheet thickness is controlled by using the gauge meter AGC and the monitor one in combination after the final sheet-thickness value is attained. By this method, the change of sheet thickness is performed during rolling in the shortest time, and both of efficiency and yield are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for changing plate thickness during rolling in a rolling process,
In particular, the present invention relates to a method of continuously rolling a predetermined material to be rolled in a tandem mill (rolling mill) while changing the thickness of the rolling plate up to a target final thickness.

In the case of high-mix, small-lot production in aluminum rolling processing, etc., in the hot rolling process, the rolled material that has reached a predetermined thickness is divided at the exit side of a lasofa mill (reverse mill), and the divided materials are The desired rolled products are obtained by performing predetermined rough rolling, then finishing rolling in a finisher mill (3 tandem mill), and winding into coils of different dimensions with different plate thicknesses.

However, in order to obtain rolled products with different thicknesses, dividing the material to be rolled and performing separate rolling operations on each section makes the automatic trussogging operation in the rolling process extremely complicated. It is also a major factor that significantly reduces production efficiency. Moreover, even if predetermined separate rolling operations are performed on each divided material, the front and rear parts of each rolled material are removed as non-standard products, so there is no material loss. Therefore, the problem of reduced yield was unavoidable.

The present invention has been developed in light of the above circumstances, and its purpose is to allow the material to be rolled to run continuously without being divided, while the finish rolling mill ( In a tandem mill (as a finisher mill), the plate thickness can be changed stably and in the shortest possible time, eliminating the factors that reduce efficiency as mentioned above, increasing product yield, and further improving the speed of the reverse rolling mill, which is the previous process. The object of the present invention is to provide a method that can simplify rolling operations and automatic trussogging operations of materials.

In order to achieve this object, the present invention makes the material to be rolled continuously pass through each roll stand of the tandem mill, and measures the X-ray plate thickness on the exit side of the final roll stand. A monitor AGC processing method that performs integral control based on the plate thickness of the material to be rolled detected by a gauge meter AGC processing method that performs proportional control based on the actual rolling load on the rolling material at each roll stand is combined. By adjusting the thickness of the material at the exit side of each roll stand, when rolling the material to a predetermined final thickness, each roll is While stopping the plate thickness adjustment of the stand, the plate thickness at the exit side of each roll stand is locked on according to the gauge meter AGC processing method. Plate thickness change amount: ΔhLI
change stepwise or continuously based on
After reaching the target final thickness, the adjustment of the thickness of each roll stand using the monitor AGC processing method and the gauge meter AGC processing method is restarted.

By the way, the plate thickness of the material that is continuously rolled in the rolling process is generally determined by monitor A G C (Auto-mat
This is done by adjusting the thickness of the material plate at the exit side of each roll stand by combining the IC Gauge Control processing method and the gauge meter AGC processing method. More specifically, the monitor AGC uses an X-ray plate thickness gauge to measure the thickness deviation of the material using X-rays, integrally controls the amount, adjusts the amount of reduction in each roll stand, and This processing method ensures that the target thickness is achieved on the exit side, but in this method, an X-ray thickness gauge is installed on the exit side of the final roll stand, which inevitably causes delays in control. For this reason, the above-mentioned gauge meter AGC processing method is combined.

In other words, this gauge meter AGC processing method performs proportional control based on the actual rolling load on the running material at each roll stand to adjust the target thickness, and the load of the material currently being rolled is This method makes it possible to reduce the time delay in adjusting the plate thickness, since the thickness of the plate is calculated based on the measured value.

The present invention utilizes a conventional plate thickness adjustment method that combines the monitor AGC processing method and the gauge meter A, GC processing method, and controls the material to be rolled under the control of the AGCl, particularly the gauge meter AGC. While running,
The plate thickness at each roll stand is changed stepwise or continuously, and the plate thickness is changed during running until the desired final plate thickness is reached. This is completely different from an intermittent method in which a predetermined equipment or apparatus is temporarily stopped or readjusted in accordance with a change in plate thickness, and rolling operations are performed according to the changed plate thickness.

Incidentally, Figure 1 shows the configuration of a rolling mill using a tandem mill, in which a material to be rolled such as aluminum 2
As in the past, after being roughly rolled from a predetermined ingot to a predetermined intermediate thickness using a reverse mill (not shown) or the like, the plate is continuously run to form a plurality of ( Here, there are three roll stands F1. F2
．． By sequentially passing through F3, the material is rolled into a material (rolled product 4) having a predetermined final thickness at the exit side of the final roll stand (F3), and is wound up by a coiler 6. And these Ikl
, lk2. l'b, 3 roll stands F+, F2
．． F3 are four rolling rolls R, , R2, R,
It has a four-high rolling mill structure. Note that a NO1 louver 8 and a floor 2 looper 10 are provided between the roll stands, and are configured to be able to control the tension of the material between them.

Further, the AGC device 12 that executes both monitor AGC and cage meter AGC includes each roll stand F1. Floors 1.1 and 1.1 each on F2□ and F3
1k1.2 and floor 3 stand load cell 14.16.1
8 and floor 1. Yang 2. N[L3 Stand gap opening degree sensors 13, 15. The load value and roll gap opening degree for the material being rolled in each stand IS, which are measured by the stand gap opening degree sensors 13, 15, and 17, are manually input. Also,
On the exit side of the final roll stand 11+ and 3 roll stand F3, there are two X-ray plate thickness gauges 20 (first),
22 (second) is provided to detect the deviation amount for materials of different thicknesses, and to detect the deviation amount for each material of different thickness,
It is now possible to type inside. As is well known, these X-ray plate thickness gauges 20 and 22 calculate the deviation amount of the plate thickness from the relationship between the transmitted X-ray amount and the plate thickness, and input a signal based on this to the AGC device 12. It is configured to do so.

In this way, each stand load cell 14°16.
1B, each stand gear knob opening sensor 13.15.1
7 and the information input from the X-ray plate thickness gauge 20 or 22, the AGC device 12 executes monitor AGC processing and gauge meter AGC processing, and calculates the final plate thickness of the rolled product 4 at each roll stand F++Fz+F3. In order to adjust the amount of reduction to give, in other words, the thickness of the material at the exit side of each roll stand, each roll stand F1. Predetermined commands are given to F2 and F3, respectively.

In such a rolling mill configuration, the material to be rolled 2 is controlled by the conventional plate thickness control function from the start of rolling until a plate thickness change command, which will be described below, is issued. That is, monitor A using one X-ray plate thickness gauge 20
GC processing and gauge meter AGC processing are carried out by AGC device 1.
2, the thickness of the rolled product 4 is controlled so that it has a predetermined final thickness. Then, the predetermined final plate thickness 2 T03 monitored by the X-ray plate thickness gauge 20
When a command is issued to change the plate thickness from T to the target final plate thickness of 3, the running plate thickness is changed according to the present invention according to the method shown in FIG.

That is, in FIG. 2, by inputting the running plate thickness change command (2) to the running plate thickness change control block 30 that constitutes a part of the AGC processing device 12, such running plate thickness change control is performed. Block 30, each stand (F,
, FZ, F3) AGC processing blocks 32, 34 and 3
6, the predetermined lock-on plate) change amount Δ
ht+ (i-1 to i-3) and each stand X-ray monitor amount hold command H+, Hz, H3 is output.

Based on this output, the No. 3 stand AGC processing block 36, which controls the reduction amount of the 1IkL30-le stand F3 that determines the final thickness of the material, calculates the thickness change amount ΔhL3 of the 1IkL30-le stand F3. . The reduction amount change, and eventually the plate thickness change processing will be executed. This is shown in FIG. 1 by the arrow pointing from the AGC device 12 to the 11 & 130-le stand F3.

On the other hand, the roll-on plate thickness change amount Δh1. 1Tha X-ray monitor one-volume hold finger 44 output together with ff signal
No. H, is M3 of floor 3 stand AGC processing block 36.
This is input to the stand X-ray monitor processing block 42, thereby holding the X-ray monitor amount of the eight roll stand and stopping the plate thickness adjustment by monitor AGC processing.

Therefore, the plate thickness at the exit side of the II & 130-le stand will be controlled by the floor 3 stand gauge meter AGC processing block 38 based on the lock-on plate thickness change amount ΔhL3, and the plate thickness that is the reference locked-on plate thickness. On the basis of the,
No. 30 - Proportional control is performed to achieve the target final plate thickness at the exit side of stand F3.

Such operation according to the lock-on plate thickness change amount Δh1°3 and the X-ray monitor amount hold command signal H3 in the third stand AGC processing block 36 is the same as the plate thickness adjustment on the exit side of the other roll stands F1 and F2. The AGC processing block 32 of the 1st and 2nd stands performs
and 34 are similarly executed. That is, based on the running plate thickness change command I, the lock-on plate thickness change amount Δh L l + ΔhLl output from the running plate thickness change control block 30 and each stand X-ray monitor amount hold command signal H,, H2 are manually input to each stand AGC processing block 32, 34, where the monitor AGC processing is stopped, while the gauge meter AGC processing is applied to each roll stand Fl+F2.
Each plate thickness is controlled so that the plate thickness on the exit side becomes the target plate thickness.

1 By adjusting the thickness of each stand as described above, the starting thickness T is determined. 3 until the target final plate thickness Tlff is reached, the lock-on plate thickness change amount ΔhLI and each stand X-ray monitor amount hold command H8 continue to be output,
As a result, the plate thickness at the exit side of each stand can be changed stepwise or continuously.

When the integral value of the lock-on plate thickness change amount ΔhL, (k) for each roll stand exceeds the target plate thickness change amount for each roll stand, for example, the lock-on plate thickness change amount ΔhL, (k) exceeds the target plate thickness change amount for each roll stand.

, Δh is the amount of change in the lock-on plate thickness each time.
When the integral value of t, 3 (1) exceeds the target final plate thickness change amount at the exit side of the N[130-le stand F, terminate the above-mentioned running plate thickness change process, Each stand AGC processing 2 Clears the lock-on plate thickness change amount Δh1, 1 for the ring blocks 32, 34, 36, and clears the X-ray monitor amount hold command signals H, H2, H3 for each stand.

After this running plate thickness change process is completed, each stand gauge meter lock-on plate thickness (h'tt) is changed to each stand gauge meter lock-on plate thickness (H'2i) before the running plate thickness change process. A normal gauge meter AGC process is started using the value obtained by adding the integral value of the lock-on plate thickness change amount of each stand: fΔhL, dt (or the integrated value: tΔh, i (k)).

At the same time, from the running plate thickness change control block 30, each stand AGC processing block 32, 34, 36
For floor 1. X-ray switching commands for floor 2 and floor 3 X-ray monitors S,, S2. S3 is output and input to the X-ray monitor processing block (for example, 42) of each AGC processing block, and the monitor AGC X-ray is outputted to the other calibrated The switch is switched to the second X-ray plate thickness gage 22 and normal monitor AGC processing is resumed. As a result, the plate thickness adjustment for the plate thickness TI3 after the plate thickness change process is carried out in the monitor AGC process and the gauge meter AGC process in the same manner as in the past.

In addition, in the above-mentioned running plate thickness change process, the lock-on plate thickness change amount Δht= (+ = 1 to 3) of each stand is as follows:
It is preferably determined as follows. In short, by simultaneously modifying the plate thickness on the exit side of each roll stand, the tension between the stands is minimized during the plate thickness change, so that the mass flow remains constant. The amount of correction of the stand is determined. That is, the plate thickness at the exit side of each stand is Hl, the advance rate of each stand is Fi, and the roll circumferential speed of each stand is V.
, and in order to keep the mass flow constant after changing the thickness of each stand, it is necessary to satisfy the following equation (1).

(ht +Δh1.+) V+ (1+ f + )−
(h2 +AhL,)v, (1+fz)-(h3+Δ
'hL3) V3 (1+f, )... (1) Therefore, from the equation (1), the following equations (2) and (3) are derived for ΔhLl and ΔhLl.

v, (t + r,) Here, ΔhLl, ΔhL2, ΔhL3 are as follows: Δh
Since Ll>ΔhL2>ΔhL3 (4), this ΔhL3 can be determined as an amount that can be sufficiently corrected in the stand F.

Note that when formulas (2) and (3) derived from formula (1) above are generalized, they are expressed as formula (5) below. However, in this equation (5), Δht, fn, and Vn represent the lock-on plate thickness change amount, advance rate, and roll circumferential speed at the final roll stand, respectively.

By determining the lock-on plate thickness change amount ΔhLI in each stand according to the above method, the conventional AGC
While continuing to function, between each roll stand, for example between roll stands F+, Fz or between roll stands F, , F.
This made it possible to change the thickness of the running plate without applying a large change in tension between the two.

The method according to the present invention as described above is generally suitably applied to hot rolling of aluminum materials, but it can also be applied to hot rolling of other materials, and The present invention can be applied not only to rolling but also to cold rolling.

Furthermore, the present invention is not to be construed as being limited to the above-mentioned specific examples illustrated to facilitate understanding of the present invention, and as long as it does not depart from the spirit of the present invention, it is within the knowledge of those skilled in the art. It goes without saying that the present invention can be implemented with various changes, modifications, improvements, etc. based on the above embodiments, and the present invention includes such embodiments. For example, in the above specific example, there are two types of plate thicknesses T. In order to adjust the plate thickness of 3 and TI3, two X-ray plate thickness gages 20°22 are used which are calibrated for each plate thickness. If it is possible to monitor a thickness greater than that, it is not necessarily necessary to use one of these gauges and monitor the thickness of each gauge using multiple gauges. be.

As described in detail above, the present invention changes the thickness of the rolled material while running it to the desired thickness while continuously running the material without dividing it.
a) It becomes possible to roll and wind up materials such as hot-rolled coils of different dimensions as a single coil without having to separate them at the entrance and exit sides of the rolling mill; (b) With this function,
The rolling operation of the reverse rolling mill in the previous process is simplified and efficiency is improved. (c+) The automatic tracking process of the entire reverse mill-tandem mill was simplified, and troubles such as tracking mistakes were reduced. This is where the excellent industrial significance of the present invention lies.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a rolling mill showing an example of implementing the method of the present invention, and FIG. 2 is a signal system diagram showing one control method according to the present invention in such a rolling mill. 2: Rolled material 4: Rolled product 6: Coiler 12: AGC device 13: 11kL stand roll gear opening sensor 14: 11kl stand load cell 15: 11k12 stand roll gear opening sensor 1G: Floor 2 stand load cell 17: fm3 Stand roll gap opening sensor 18
:3-stand load cell 20.22i X-ray plate thickness gauge 30: Running plate thickness change control block 32: Ncil stand AGC processing block 34:11
k12 stand AGC processing block 36: lk3 stand AGC processing block 38: m3 stand gauge meter AGC processing block 4 (lNa30-rugia sob change amount processing block 42:
IIkL3 stand X-ray monitor processing block F1: Floor 10-le Stand F2: Row 20-le stand 9 F,: N1130-le stand Applicant: Sumitomo Light Metal Industries, Ltd. 0

Claims (2)

[Claims] (1) Based on the plate thickness of the rolled material detected by an X-ray plate thickness meter at the exit side of the final roll stand while the rolled material is continuously run and passed through each roll stand of the tandem mill. The thickness of the material at the exit side of each roll stand is adjusted by combining the monitor AGC processing method that performs integral control using a gauge meter AGC processing method that performs proportional control based on the actual rolling load on the traveling material at each roll stand. When rolling a material to a predetermined final thickness, the thickness adjustment of each roll stand by the monitor AGC processing method is stopped by the command to change the thickness to the target final thickness, while the gauge meter AGC Lock-on the plate thickness at the exit side of each roll stand according to the processing method Amount of plate thickness change: Δh1
．． After the target final thickness is reached, the thickness adjustment of each roll stand is restarted using the monitor AGC processing method and the gauge meter AGC processing method. Characteristic method for changing plate thickness during rolling process. (2) The amount of lock-on plate thickness change in each roll stand = ΔFILi is the plate thickness at the exit side of each roll stand in h
i, the advance rate of each roll stand is fl, and the roll circumferential speed of each roll stand is V (however, n indicates the respective value at the final roll stand), the following formula: Claims determined by the following formula: The method described in paragraph 1.