JPS5924511A - Cooling method of material to be rolled - Google Patents

Abstract

PURPOSE:To obtain a steel plate excellent in flatness and that of uniform quality, by cooling a material to be rolled while introducing the center line of it to that of a coolant. CONSTITUTION:A width detector 19 dispose at the exit of a rolling mill detects the width of a finished plate to transmit its signal to a calculating device 20. The device 20 calculates the setting width of side guides 14, 14' and the timing of setting of them basing on both of further inputting signals from a material information 21 referring to the thickness and components and from tracking information 22, to transmit a signal to an automatic position controlling device 23 thereby outputting to a side-guide driving device 24 to drive the guides 14, 14' for setting them. By this setting, the center line of a material 3 to be rolled is automatically aligned with that of the coolant. Shielding plates 4, 4' disposed at the coolant are used to prevent the edge parts of the material from cooling and to cool the center part of it.

Description

[Detailed description of the invention] The present invention relates to a cooling method for rolling mills.

In a hot rolling line, the flow rate of hot coolant in the width direction is controlled in order to obtain a flat steel plate with a good thickness and uniform material quality.

As shown in Figure 1, the number of turns in the width direction! 7 temperature (hereinafter referred to as CT
There is a phenomenon that the temperature at the edge of the plate is 30 to 0°C lower than the center of the machine.

During rolling, the temperature at the edge of the plate is 1 degree higher.

The following problems have occurred.

(1) The shape of the strip at room temperature after cooling becomes a shape with large edge elongation, as shown in FIG.

<2) As shown in Figure 13, the welds in the width direction become uneven. In other words, the mechanical strength of the plate edge portion is extremely high and the metallographic structure is non-uniform.

In order to solve the above-mentioned problems, a width direction flow control device as shown in FIG. 9 has conventionally been used. This device has many nozzles installed in the header! .

-m- is located above the edge part of the strip 3, and the shielding plate y' is inclined at the crotch part to the edge part of the abrasive (11 between 7,0 and 300). ) to prevent the temperature from dropping by preventing cooling water from coming into contact with it, so that only the central part is cooled.

J in the figure is a table roller.

However, in the rolling line, the plate rolled by the finishing mill is not completely flat due to the fact that the thickness of the left and right plates is not completely even, and the hot run table is not completely horizontal. Don't follow the center of the road, always turn left or right. This is pressure + iE
Curving occurs regardless of whether the iJ is at the tip, center, or rear end in the longitudinal direction. The thickness of this bend is 200~ at the tip and rear end.
500 mm, and 700 to 200 mm in the center is normal.

If bending occurs on the hot run loop as described above, the effect of the mid-direction flow rate control 1 of the coolant cannot be fully exerted.

Therefore, the width direction flow rate of the beach according to the present invention? ll? As a result of repeated research in order to make J41 work effectively, we decided to completely cool the rolled material with a cooler nod device installed on the conveyor table between the finish rolling machine and the coiler of the hot strip mill line, and the center of the rolling moon. The fact that a better result can be obtained by guiding the mackerel to the center of the coolant and cooling it while cooling the horse mackerel under the heading 7 is proposed as the present invention.

The hot strip mill line used in the method of the present invention is the fifth
As shown in the figure, the same one as before is used. That is, heating furnace B, rough rolling mill 7, crop shear G, finishing rolling mill,
Coolant A, side kite/g, 10, coiler//
The rolled material 3 is sequentially installed and rolled by the finishing rolling mill 7.
Cool with coolant A, and then install the side guide / &', /
Adjust the center position with 0 and wind it up with the coiler //.

In the method of the present invention, cooling is performed by directing the center line of the rolled material 3 to the center of the coolant A on the conveying table on which the coolant 1-Ak is installed. Due to this induction, coolant A
The shielding board installed in

Preventing cooling of the edge part of the cooling water by Z' (7. Only the medium heat part is cooled.

To guide the centering of LF and the rolled material 3, as shown in Figures J and O, side kites /G and /G' are placed facing both sides of the rollers /3 of the conveyor table /2. conduct.

Seven examples of side guides /ri, /gu' are explained based on figure m17.
The entrance side of each roller is formed with an inclined surface that opens outward, and a protruding portion yA, --- is provided between each roller 3 so as to be positioned below the two surfaces of the roller 3, and this Protrusion 81X
1 (Tsute carpet / 7 is placed above and below the place where / B is installed, this: nt: 4 i Re / 7 is a plate / g
).

The rate/g is brought into contact with the side 1h1 of the rolled material 3 so that it can be easily replaced in the event of jγ wear due to contact.

Also, the distance between both side guides /g and /' is equal to i of the rolled material 3.
It is installed so that it becomes 7, (+) 0 ~ / 3 Q wn, with respect to J. As shown in the figure, the 11] detector /'? was installed at the outlet of the compressor.
Finished board i] (i7 detection L7, sends the signal to the computer, 2.0, and further calculates (to Tate 20) the signal from the corner and component lumber 1 information 2/ and the signal from the tracking information J2 Set 11 of side kite /g, /g'
” and the timing of the set, the automatic position control device, sends a signal to 23, and the sight guide drive clamping J
Output to &7 and side guide/41. /'l' is driven and set. According to this cent, the rolling material 3 automatically aligns its center line with the center of the coolant l-A.

Next, to explain another example based on the gg diagram, both side guide/'1. /Z is located at the protruding part of 'l'.

Is there a warm, arc-shaped hole in the top and bottom in the first place? X1 (77'
, and a guide roller/g"rc is attached to the joint part 77'. Therefore, since the contact surface is a guide roller, contact wear during centering does not occur, and the plate speed j The technique is the same, but it is rotated by ! degrees, which prevents damage and bending of the board edge during centering.

The setting of both side guides /4/- and /'l' is controlled in the same manner as described above.

Example/ A round plate was installed at a distance of 70 m from a finishing rolling mill.

Normal board thickness 2.3 tone, board 111/000wrbA
rA] At the center in the lateral direction, the deviation of the center of the board from the center of the table (the amount of bending of the board) is the average gQmm, , /σ - Q mtn, ((7σ is the standard deviation) , the side guide made it almost Q wn.

[Brief explanation of drawings]

Figure 1 is a diagram showing the winding temperature distribution for the plate, Figure J2 is a diagram showing the relationship between the amount of temperature drop during winding and the shape of the room temperature, Figure 3 is a diagram showing the material in the machine direction, and Figure 4 is a diagram showing the coolant. 43 is a side view showing the arrangement of side guides used in the method of cooling rolled material according to the present invention; FIG. 4 is a plan view thereof; and FIG. 7(a) is an example of the side guide. (B) is a side view, (C) is an enlarged cross-sectional view, and Fig. g (a) is a cross-sectional view of the main part showing another example. (b)
7 shows a side view, and FIG. 7 shows a block diagram showing side control. In addition, in the figure, A is a coolant, 3 is a rolling side, ri is a finishing mill, and // is a coiler. M Measurement Applicant Kawasaki Steel Co., Ltd. Figure 1 Figure 12 Figure 3 Figure 4 Figure 5-6 Figure 7 (C) Figure 8 1i! 9 Figure

Claims (1)

[Claims] Rolling characterized by cooling the rolled material while guiding the center line of the rolled material to the center of the coolant when completely cooling the rolled material using a goulant device installed on the conveyor table between the finish rolling machine and the coiler of a hot strip mill line. Method of cooling materials.