JPS6099422A - Automatic sheet-thickness controlling device of rolling mill - Google Patents

Abstract

PURPOSE:To control accurately the thicknesses of flange and web of a steel shape by operating mill-spring constants in on-line and feeding back its results to a draft-position controlling device of rolling rolls. CONSTITUTION:A mill-spring-constant arithmetic device 19 operates and outputs mill-spring constants MW, MFW, MFD by inputting rolling reactions detected by reaction detectors 14a, b, c and information relative to the shape of a material to be rolled. By using these mill-spring constants, and inputting the draft positions of rolling reduction screws 15a, b, c detected by draft-position detecting devices 17a, b, c and rolling reactions detected by rolling-reaction detectors 14a, b, c; DELTAhW, DELTAhFW, DELTAhFD are operated to output corrected draft- position command values. Basing on these command values, the positions of rolling reduction screws 15a, b, c are corrected by actuating rolling-reduction-screw driving devices 16a, b, c.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a section steel rolling mill, particularly a universal rolling mill for H section steel (
The present invention relates to an automatic plate thickness control device.

[Prior art]

1 (shape steel is generally rolled by a universal rolling mill (hereinafter abbreviated as rolling mill). Fig. 1 schematically shows the rolling rolls in this rolling mill.

That is, in Fig. 1 (tA)l (B), the horizontal rolls (1a) and (1b) of the rolling mill are arranged vertically facing each other, and the vertical rolls (2a) and (21)) of the rolling mill are located on the right side of the hill. They are placed opposite each other.

Among them, reference numeral (2a) is a work-side ship roll, and reference numeral (2b) is a drive-side vertical roll. These horizontal rolls (Ia), (1t)), vertical rolls (2a)
, (2b) Between H is the material to be rolled (hereinafter abbreviated as material)
A section steel (3) is interposed, and in this H section steel (8), reference numeral (3a) is a work side flange, reference numeral (3b) is a drive side flange, and reference numeral (6C) is a web.

Above horizontal o-le (ia), (1b), vertical C1-#
(2a).

(2b) is rolled down by a roll rolling device (not shown) to roll the H-section steel (8). It is generally set to a certain value in the previous state, and during rolling of the material, rolling is performed with the rolling position of the MIJ roll fixed.

Conventionally, as automatic plate thickness control devices for section steel, gauge meter type devices used in flat plate rolling have been applied in both the horizontal and vertical directions. Is there a way to apply it?
The automatic plate thickness control device as described above has the following drawbacks. In other words, in the rolling of shaped copper, as in the case of flat plate rolling, there are disturbances in the longitudinal direction of the material such as differences in water retention, hardness, and variations in plate thickness, and as a phenomenon unique to shaped copper rolling, the material The deformation and metal flow caused by the deformation are extremely complex, and the deformed metal 70 does not simply occur in the longitudinal direction, but rather in the flange portion (3a) of the section steel.

This also complicates the phenomenon that occurs between the flange portion (3b) and the web portion (3c).However, due to the mutual interference between the flange portion (3cL)% (3b) and the web portion (3c), As a result, even though the material thickness does not change, or even though the change is so small that it can be ignored, the rolling reaction force changes.
Elephants exist. As mentioned above, due to the peculiar phenomenon of shaped copper rolling, the basic method of fixing the rolling position during material rolling, which has been conventionally applied, or the general gauge meter type automatic plate thickness [Summary of the Invention] This BA was made based on the above circumstances, considering the mutual interference between the rolling of the flange part and the rolling of the web part of shaped copper.
The mill spring constant is calculated online, and this is fed back to the rolling roll position control device to automatically control the plate thickness. The purpose of the present invention is to provide an automatic plate thickness control (incorporated) box manufacturing system in a rolling mill that allows the flange thickness and web thickness to be controlled with cylinder accuracy.

[Examples of invention]

The principle of the invention is as follows.

Now, regarding H-shaped copper rolling, if we assume that there is no complicated mutual interference between the flange part and the web part, the following (1
) to (3) hold true.

hw=Sw+Fw/Mw...(1) hFW=5
11v, +'Fw/”Fw...(2)hAwa-5F
l) 10FF7MFD...(3) Here, h is the thickness of the material at the exit side of the rolling mill, S is the roll opening, F is the rolling reaction force, M is the mill spring constant of the rolling mill, and the suffix W is the web. FW indicates Worksite 2 flange, and FD indicates Drive Two flange.

The above equations (1) to (3) are the so-called gauge meter type used to calculate the plate thickness in conventional automatic plate thickness control devices.

Conventional automatic plate thickness control equipment uses the above equations (1) to (3) as a basis, and after the material is bitten by the rolling mill and the transient state has stabilized, the rolling rolls (horizontal roll, vertical roll) )
Depending on the rolling position of the rolling screw that rolls down, the thickness value (lock-on value) of the rolling plate on the exit side (lock-on value) hWO'
hFWOl hFDO is calculated from the following equations (4) to (6).

hWo-8wo+Fw0/MIv...(4) h...
o=SF7. . +-FFwo/IA, FW@@1
1 (51hFDo-8FDo+FFDo/MFD...
・After that, the two lock-on values hwo and hF are set.
wO1hFD.

and hil'l hFW 1h in equations (1) to (3) above.
Unbalanced pressure ΔhW with FD.

Determine ΔhFw lΔhFD from the following equations (r) to (9).

Δhw −(S w−8wo )” (Fw−Fw
o)7Mw' ” ”(7)ΔhFW ” (SF
W""FWO) "(FFw-'Fwo)/"Fw・
...(8)ΔhFD” (“FD-8FDO)”
``FD-'FDO)/MFD ・ ・ ・ ・ (9) Here, in the above formulas (4) to (9), Zafix O calculates each 611j quantitative value at the time when the standard rolling edge side plate thickness value is calculated. show.

Next, the rolling mill output II obtained from the above formulas (7) to (9)
The lower device of the lower screw is controlled so that the I deviations Δhw, ΔhFw +ΔhFD become zero. In other words, the method is to output a finger value for correcting the rolling position to the downstream drive device and control the plate to one position.
It is used here. This method is generally used for Roll Force A
This is an auto uJ plate thickness control method known as G O, B15ra A () O, etc.

However, the mill spring running Mw l "FW I MFD used in the above-mentioned conventional automatic board speed control method
Since it is an identified value that is measured statically off-line, it has the disadvantage that it cannot deal with the rolling machine plate peculiar to H-beam steel as described above.

Therefore, in this book @mei, we will discuss the mill spring constant, which was conventionally considered as an identification value, regarding the shape of the special grade rolled phase: f″1, and in the case of the embodiment of the present invention, the A performance device k is provided which inputs information about the valley thickness of the flange and web and information about each ring and performs calculations off-line.

Φ ・ -+12) The width and ' mark indicate the mill spring constants calculated by the equation.

(As is clear from the old model, the calculation device used in the present invention is a unique function generator, and the mill spring constant df operator corresponds to the rolling pressure and shape information as input variables.
Next, the gauge meter formulas (10) to (1) corrected using the old formulas are shown as the following formulas (13) to (15).

h w=S W-1-F w/”, -life (IB+hF
w ”' sFw +'Fw / MFw ... (Tree hFD - 8 10 FFD / MFD ... μs) C13 above) to (hW obtained through the grant) jhFwlh
FD'l: Use the lock-on value as in the conventional method.
WO'hFWOIhFDo and individual difference Δh
6. Calculate Δhi and Δhh using the following formulas (10) to (I8) 0Δh, 7 = (SW-8wo) + (
Fw−FWo)/mu~・e・(16)ΔhFw”
(SFw-8Fwo)+('Fw-'Fvio)/M
Fw...(1°l)ΔhFD = (SFJJ-8
FDO)+(Fl-'FDO)/"FD...(1
8) The present invention feeds back the above-mentioned deviations Δhw, ΔhFW, and Δh to the excitation device to keep the thickness and web thickness of the section steel constant.

The implementation νl of the book 9 will be explained below with reference to FIG.

Flange part of H-shaped steel os+ (+3a), (+3b)
Vertical roll (12a), (1zb
), but horizontal rolls (+ ia) and (+ + b) are respectively placed against the VC of Ya's Kuep (15C), and their proof rolls (+2a).

(tzb), horizontal rolls (11a), (11b) are respectively driven by screw-down screw drive units K (+6a), (+
6'b), (16c) are driven by the lowering screws (15a), (15'b), (15c). This downstream screw (15a).

(lsb), (15c) K Id, respectively flE
Lower position 1 [a is determined by lower position detection 4M1
st, (17a), (17b), (+7c) are provided.

1) Ijki water 10 rolls (11a) and vertical rolls (1za
), (+20 is the rolling reaction force 'f: reaction force detector to detect (
14a), (+4'b).

(+4a) I'll fix it independently.

The above is my 44rla, and I am a master of the mill spring leg performance promotion device that calculates the mill spring definition online.
9) and the lowering position command 1 that outputs the target downstream position.
Direct output device! (+8a), (+8t+), (+80
) are provided as shown in the figure.

That is, the mill spring rectangle calculation device (1α is the rolling reaction force F"FW" detected by the reaction force detectors (14a), (14b), (+4c)) and the tM report (hw) regarding the shape of the rolled material. 'N...hF♂+ Zw
``Zy''...) is played, and the mill spring constant Mw ``Fw'' FD is output.

This mill spring constant "W ' MFW I MFD
, the lowering position detection device R (17a), (17b),
The reduction screw (15a) detected by (+7c)
), (15b), (15c) and the rolling reaction forces FW ``FW'' FD detected by the reaction force detectors (14a), (141)), (140) are output to the output device (18a). , (1B'b), and (18c) to calculate Δhw, ΔhFw 'Δhy D), and output the corrected Δh&, Δh, and Δh几 as the lowering position command values.

Based on this specified value, the reduction screw drive device (+6a
, ), (16'b), (16c)! Ka j ribs, j upper and lower screws (17a), (17b), (17
c) It is constructed so as to apply a pressure of 1iM'x.

〔Effect of the invention〕

As described above, the present invention solves the problem in the form of a change in the Chemils Grink formula, which has not been considered or considered, between the rolling of the flange part and the rolling of the web part. We installed a calculation device that calculates on-line, and fed back a predetermined correction value to the rolling position control II device, which consists of a rolling screw and a rolling screw drive device that controls the rolling position of the rolling rolls. 2. Both the flange thickness and web thickness can be automatically controlled with high precision.

In the above example, the calculation device for calculating the mill spring constant was applied to a so-called roll force AGO. Applicable to

In addition, in the above embodiment, the shape of the rolled material side was used as the 111 report regarding the shape for calculating the mill spring constant basin, but of course, the 1g report regarding the shape of the rolled side, etc.
In other words, information regarding the roll shape, roll material, etc. is not acceptable.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing a material to be rolled and a rolling roll in a universal rolling mill, in which (A) is a partially cutaway perspective view, (B) is an end view of the material to be rolled, The figure is a configuration diagram of an automatic plate thickness control system fil showing an example of the present invention. (lia), (++b), , horizontal roll (12a)
, (12b) ” ” vertical 1: I - le flt3j 6
& H-shaped steel (14a), (t4b), (+4c) -,
Reaction force detector (+5a), (45b), (15c)
-@Reduction screw (+6c), (+6b), (+6c
) -- Reduction screw drive device (17a), (17
b), (17c) --Down position detection device (+8a)
, (+8b), (18c) ・・Down position command 1 direct output device (19) ・・Mill spring foot count calculation device agent Large
Masu Iwa No. 4L Figure 1 (A) Procedural amendment (spontaneous) 1 Indication of the case Tokuhan Sho t♂-2iD77g No. 2
Name of the invention j] Automatic plate thickness control device for L field machine 3 Relationship with the case of the person making the amendment f'-f' To Jinhachi Katayama, representative of the applicant 4, agent - f Iha and others L' Nofune A A column for the detailed description of the invention in the specification subject to the O5 amendment. 6 Contents of supplementary IL (1) Details,! ÷Complete +l- for 11self/IM "to give feedback" in line 6 of page 5 with "feet/top." (2) Details; 1 (line 8 to line 9 of page 5) 's "Depletion 1"
71 control of ships" was written as "1JL control with high precision".
Complement i1-. J, 1. , l-:.

Claims (2)

[Claims] (1) A pair of horizontal rolls, a vertical roll arranged perpendicular to the rolls, a rolling control device for controlling the rolling positions of these horizontal rolls and vertical rolls, and the horizontal rolls and vertical rolls. a reaction force detector that independently detects the rolling reaction force received from the material to be rolled; a rolling position detection device that detects the rolling positions of the horizontal roll and the ship roll; and a rolling reaction force detected by the reaction force detector. A mill spring constant calculation device that calculates the mill spring constant used in the plate thickness calculation formula in the gauge meter type online by inputting the force and the shape of the material to be rolled or one piece of information regarding the horizontal rolls and vertical rolls on the rolling mill side. The mill spring constant calculated by this calculation device, the rolling position detected by the rolling reduction lower 1i detection device bIJ, and the rolling reaction force detected by the reaction force detector are used as input to calculate the target. 1. An automatic sheet thickness control device for a rolling mill, comprising: a downstream position command value output device that feeds back a command value instructing a rolling position to the rolling position control device. (2) The flange thickness, web thickness, flange thickness, and web width of the H-section steel are inputted to the mill spring constant calculation device as information regarding the shape of the rolled material. Automatic plate thickness control device for rolled images.