JPH06609A - Continuous casting equipment - Google Patents

Abstract

PURPOSE:To improve the correcting accuracy of the deformation of a cast slab and to reduce the maintenance cost of equipment and down-time. CONSTITUTION:Thermocouples 1a, 1b are embedded into asymmetric corner parts of a mold 31, respectively piercing a jacket 32, and the temp. of each corner part is detected and transmitted to a control panel 10. Molten metal 41 continuously supplied from a nozzle 33 becomes a cast slab 40 having square or rectangular cross section forming the solidified shell 42 at the outer peripheral part, and the cast slab is discharged to the lower part of the mold 31. Correcting spray pipes 2a, 2b are arranged in opposite on the respective corner parts 40a and 40b where the cast slab faces. By calculating the detected temp. difference with a control panel 10, the necessary cooling water spraying quantity to correct the cast slab is calculated, and by working the flow rate adjusting values 6a, 6b, the cooling water is adjusted to the suitable flow rate to correct the rhomboid deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a slab having a square or rectangular cross section, which is cast by a continuous casting facility.
The present invention relates to a rhombus deformation prevention device.

[0002]

2. Description of the Related Art FIG. 5 is a cutaway side view showing an essential part of a continuous casting facility and a rhombus deformation preventing device for a cast piece, which is an example of a conventional device. FIG. 6 is a sectional view taken along line VI-VI of FIG. Is VII − in FIG.
It is a VII sectional view.

As shown in these figures, in the conventional continuous casting equipment, the molten metal 41 is continuously supplied from the nozzle 33 to the mold 31 cooled by the cooling water 34 in the jacket 32 to solidify the molten metal 41 and the outer circumference. A square slab 40 having a solidified shell 42 formed on its part is discharged below the mold 31, and is supplied while being guided by a guide roller 35 in an arc shape while being cooled by a cooling water spray (not shown).

In the continuous casting operation described above, the slab 40
In many cases, non-uniform solidification occurs in the mold 31 due to many factors such as the composition of the molten metal, slab conditions, non-uniform cooling, and the cross-sectional shape thereof is transformed into a rhombus as shown in the drawing.

If this rhombus deformation becomes large, it causes cracks in the slab 40 and breakout accidents, and also causes troubles in the rolling process, which is a major problem in quality control.

Therefore, in the conventional apparatus, the mold 31
The cross-sectional shape of the slab 40 was mechanically corrected by the correction roller 36 disposed at the outlet of the slab to prevent the slab 40 from deforming in a rhombus shape.

[0007]

By the way, in the conventional continuous casting apparatus as described above, the straightening roller 36 arranged at the outlet of the mold is continuously used under adverse conditions such as high temperature and jet of cooling water. However, there is a problem that the mechanical accuracy thereof is reduced in a short time, and the accuracy of rhombus deformation correction of the slab 40 is reduced.

Therefore, in order to keep the rhombic deformation of the cast slab 40 within an allowable amount, it is necessary to replace the straightening roller 36 and its bearings in a short time, which causes a problem that equipment maintenance cost and downtime increase. To do.

According to the present invention, it is possible to solve the above problems and to obtain a new continuous casting facility capable of improving the accuracy of the cross-sectional shape of the slab and reducing the maintenance cost and downtime of the facility. Has an aim.

[0010]

As a structure for achieving the above object, the continuous casting equipment of the present invention is a slab having a square or rectangular cross section, in which a molten metal is continuously supplied to a cooled mold for solidification. In a continuous casting facility for continuously casting, the mold corner temperature difference detecting means respectively provided in the corner portions of the square or rectangular cross section of the mold, and the slab deformation amount calculated by the temperature difference detected by the detecting means. A calculation means, a correction cooling water amount calculation means for calculating the amount of cooling water necessary for correcting the deformation according to the deformation amount and the deformation direction of the slab, and two sets of cooling arranged so as to face each corner of the slab. It is characterized by comprising a water injection device and cooling water supply amount adjusting means provided in each of the cooling water injection devices.

[0011]

In the continuous casting equipment of the present invention, in order to prevent the diamond-shaped deformation of the slab, in the continuous casting of the slab, the temperature of each of the non-opposing corners of the cooled mold is detected by the mold corner temperature difference detection. Each of them is detected by the means, and the temperature difference is calculated.

When the slab is deformed in a rhombus, a gap (hereinafter referred to as an air gap) is generated between the slab and the mold,
Since no heat is transferred from the slab to the corner portion, the temperature thereof is lowered and a temperature difference is generated between the adjacent non-opposing corner portions.

The value of this temperature difference is proportional to the size of the air gap.

Next, the cast slab deformation amount calculation means calculates the rhombus deformation amount and the deformation direction of the slab according to this temperature difference and whether the value of this temperature difference is + or-.

Further, the correction cooling water amount calculating means calculates the amount of cooling water necessary for correcting the deformation based on the deformation amount and the deformation direction, and the obtuse angle corner portion of the diamond-shaped deformed slab (on the side where the mold detection temperature is low). The amount of cooling water is instructed to the cooling water jetting device facing the.

According to this instruction, the cooling water jetting device jets the cooling water to the obtuse-angled corner portion to cool it, and corrects the rhombus deformation of the slab.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same members as those of the conventional device are designated by the same reference numerals, and duplicated description will be omitted. FIG. 1 is a cutaway side view showing a main part of a continuous casting facility and a rhombus deformation preventing device for a cast piece, which is one embodiment of the present invention, and FIG. 2 is a sectional view taken along line II _A- II _A and II _B- II in FIG. FIG. 6 is a plan view showing a _B cross section.

In these figures, 1a and 1b are thermocouples, which penetrate the jacket 32 and are embedded in the non-opposing corners of the mold 31, respectively, and detect the temperature of each corner and send it to the control panel 10. Is configured to.

Molten metal 4 continuously supplied from the nozzle 33
1 is solidified in a mold 31 cooled by cooling water 34 in a jacket 32 and has a square or rectangular slab 40 having a solidified shell 4 in the outer peripheral portion.
And is discharged below the mold 31.

Reference numerals 2a and 2b are straightening spray pipes disposed near the outlet of the mold 31, and one straightening spray pipe 2a is one of the opposite corner portions 40a of the slab 40.
On the other hand, the other straightening spray pipe 2b is arranged so as to face each other at the other facing corner portion 40b, and the respective flow rate control valves 6a and 6b are mounted via the both water supply pipes 8a and 8b. ing.

The flow rate control valves 6a and 6b are connected via respective water supply pipes 8.8a and 8b and electromagnetic flowmeters 7a and 7b.
The flow rate control valves 6a and 6b are connected to the cooling water source 9 and are configured to receive from the control panel 10 and the electromagnetic flow meters 7a and 7b to transmit to the control panel 10.

FIG. 3 is a block diagram showing the structure of the control panel.
As shown in FIG. 3, the control panel 10 includes both thermocouples 1a.
1b, a temperature difference calculation unit 11, a deformation amount calculation display unit 12, a deformation amount comparison unit 13, and an allowable deformation amount storage unit 14.
And the injection water amount calculation unit 15 and the respective electromagnetic flow meters 7a, 7
It is provided with a pair of flow rate instruction | indication parts 16a * 16b which receives from b and transmits to each flow control valve 6a * 6b.

Next, the operation of this apparatus will be described. First, the temperatures a and b of the non-opposing corners of the mold 31 cooled by the cooling water 34 in the jacket 32 are
It is detected by each thermocouple 1a and 1b.

When the cast slab 40 is rhomboidally deformed as shown in FIG. 2 (A), an air gap c is generated between the obtuse angle corner portion 40a and the mold 31, and the sensible heat of the solidified shell 42 is obtuse angle corner portion. Since it is not transmitted to 40a and the outer surface is water-cooled, the temperature a of this corner portion of the mold 31 is significantly lower than the temperature b of the adjacent non-opposing corner portion, and the reduction value of the temperature a is The size of the gap c,
That is, it is proportional to the magnitude of the rhombus deformation amount.

Therefore, the temperature difference calculation unit 11 calculates the temperature difference from each of the detected temperatures, and the deformation amount calculation display unit 12 calculates the deformation amount of the slab 40 to display an image, and the deformation amount is calculated. By the deformation amount comparison unit 13,
Compared with the allowable deformation amount stored in the allowable deformation amount storage unit 14, if the allowable deformation amount is exceeded, the value obtained by subtracting the detected temperature b of the other thermocouple 1b from the detected temperature a of one thermocouple 1a The deformation direction is determined depending on whether it is + or −, and the injection water amount calculation unit 15 calculates the + or − cooling water injection amount required for straightening the slab 40.

If the calculated value is, for example, a negative value, the one flow rate indicator 16a reads the cooling water flow rate of the water supply pipe 8a detected by the one electromagnetic flow meter 7a, and the one flow rate control valve 6a is operated. It is operated to adjust the cooling water 3 to an appropriate flow rate.

If the calculated value is a positive value, the other flow rate indicator 16b reads the cooling water flow rate of the water supply pipe 8b detected by the other electromagnetic flow meter 7b while the other flow rate control valve 6b is being read. Operate.

In the illustrated example, since the temperature a is lower than the temperature b and ab has a negative value, one straightening spray pipe 2a facing the obtuse corner 4a has one flow rate adjusting valve 6a.
An appropriate amount of cooling water 3 supplied from a is jetted to both obtuse-angled corner portions 40a to be cooled, and the rhombic deformation thereof is corrected.

When the deformation direction is opposite to that shown in the drawing, the other corner portion 40b of the cast slab 40 has an obtuse angle and ab has a positive value, so the other straightening spray pipe 2b.
Ejects the cooling water 3 supplied from the flow rate control valve 6b to the other corner 40b having an obtuse angle.

A summary of the above operation is shown in the flow chart of FIG.

Although one embodiment of the present invention has been briefly described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the technical idea of the present invention.

[0032]

According to the continuous casting equipment of the present invention, the temperature of each of the non-opposing corner portions of the mold is detected, the rhombus deformation amount and the deformation direction of the slab are calculated based on the temperature difference, and the calculated value is calculated. Cooling water with an appropriate amount of water calculated by is sprayed to the corners of the slab that has become obtuse due to rhombus deformation to cool it, and by correcting the rhombus deformation, the device is not in contact with the slab. Therefore, the degree of consumption is low, and the maintenance cost and downtime of the equipment can be reduced.

Further, since it becomes possible to accurately grasp the rhombus deformation amount of the slab and the cooling water amount corresponding to the deformation amount can be accurately adjusted, the precision of the cross-sectional shape of the slab is improved. be able to.

[Brief description of drawings]

FIG. 1 is a cutaway side view showing an essential part of a continuous casting facility and a rhombus deformation preventing device for a cast piece, which is an embodiment of the present invention.

FIG. 2 is a plan view showing a II _A- II _A cross section and a II _B- II _B cross section of FIG.

FIG. 3 is a block diagram showing a configuration of a control panel in the apparatus according to the embodiment of the present invention.

FIG. 4 is a flow chart summarizing the operation of the apparatus of the embodiment shown in FIG.

FIG. 5 is a broken side view showing an essential part of a continuous casting facility and a rhombus deformation prevention device for a cast piece, which is an example of a conventional device.

6 is a cross-sectional view taken along the line VI-VI of FIG.

7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 1a ・ 1b Thermocouple 2a ・ 2b Straightening spray pipe 3 Cooling water 6a ・ 6b Flow rate control valve 7a ・ 7b Electromagnetic flowmeter 9 Cooling water source 10 Control panel 11 Temperature difference calculation unit 12 Deformation amount calculation display unit 15 Injection water amount calculation unit 31 Mold 34 Cooling water 40 Cast slab

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kunimasa Sasaki 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd.Hiroshima Works (72) Inventor Yuuo Hori 11125, Tsubakihara, Toriumi, Yamauchi, Kishima-gun, Saga Prefecture Address: Kyushu Steel Co., Ltd., Saga Factory (72) Inventor Hiroyuki Kitagawa 6-22, Kannon Shinmachi, Nishi-ku, Hiroshima City Hishiju Steel Engineering Co., Ltd. Hiroshima branch office (72) Inventor Toru Nishimura 4-6, Kannon Shinmachi, Nishi-ku, Hiroshima City No.22 Hishige Steel Engineering Co., Ltd. Hiroshima Branch Office (72) Inventor Yasushi Fujikawa 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Hishige Steel Engineering Co., Ltd. Hiroshima Branch Office

Claims (1)

[Claims] 1. A continuous casting facility for continuously supplying a molten metal to a cooled mold to solidify the molten metal and continuously casting a slab having a square or rectangular cross section, the corner portion of the mold having a square or rectangular cross section. Mold corner temperature difference detecting means respectively provided in the, the slab deformation amount calculation means calculated by the temperature difference detected by the detecting means, the amount of cooling water required to correct the deformation by the deformation amount and deformation direction of the slab A cooling water amount calculating means for calculating, a pair of cooling water injecting devices arranged so as to face each corner of the slab, and a cooling water supply amount adjusting means provided in each cooling water injecting device. A continuous casting facility characterized by consisting of