JPH11114601A - Slab width reduction method and equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress the formation of a dog bone in a cross section in the slab width direction and the formation of a fish tail in a slab plane shape. A slab (2) delivered from a continuous casting machine (1).
Is cut into a predetermined length by the cutter 3, the pair of dies 23a and 23b of the slab width press device 20 are moved toward and away from each other, and the high-temperature slab 2 inserted into the transport line S is removed from the slab 2. By pressing down in the width direction with the dies 23a and 23b having a sufficient contact length with respect to the width direction edge, it is possible to suppress the formation of a dog bone in the cross section in the slab width direction and the formation of a fish tail in the slab plane shape. Then, the slab 2 is pressed down in the thickness direction by the horizontal rolling mill 21 to smooth the cross-sectional shape in the slab width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab width reduction method and equipment.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of a conventional slab width reduction equipment. In this slab width reduction equipment, a slab delivered from a continuous casting machine 1 arranged at the upstream A side end in the conveying direction is used. A first edger 4, an upstream horizontal rolling mill 5, a second edger 6, a recuperator 7, and a downstream horizontal rolling mill 8
And are sequentially arranged along the slab transfer line S.

The continuous casting machine 1 includes a mold 10 to which a molten metal 9 is supplied, and a nozzle 11 communicating with the inner bottom of the mold 10 and having an opening corresponding to the cross-sectional shape of the slab 2 to be cast. ing.

The slab 2 delivered downward from the opening of the nozzle 11 is supported by a plurality of pinch rolls 12 which hold the slab 2 from both sides so as to be gradually horizontal.

The first edger 4 has a pair of vertical rolls 13a and 13b opposed to each other on the left and right sides of the slab transport line S and supported so as to be able to approach and separate from each other. By pressing the slab 2 toward the slab transport line S by a pressing means (not shown) such as a cylinder, the slab 2 advancing between the vertical rolls 13a and 13b is pressed down in the width direction.

[0006] The upstream horizontal rolling mill 5 includes a pair of work rolls 14a and 14b vertically facing each other across the transport line S.
And pressing rolls 15a and 15b contacting the work rolls 14a and 14b from the side opposite to the conveying line, and pressing a shaft box pivotally supporting a journal portion of the upper holding roll 15a with a pressing means such as a screw jack (see FIG. (Not shown) toward the transport line S, the two work rolls 14
The slab 2 inserted between a and 14b is pressed down in the thickness direction.

The second edger 6 has a pair of vertical rolls 16a and 16b opposed to each other on the right and left sides of the transport line S and supported so as to be able to approach and separate from each other.
The slab 2 advancing between the vertical rolls 16a and 16b is pressed down in the width direction by pressing the a and 16b toward the transport line S by pressing means (not shown) such as a fluid pressure cylinder. Has become.

The recuperator 7 is provided with the first edger 4 described above.
And the second edger 6, the slab 2 rolled down in the width direction by the horizontal rolling mill 5 and rolled down in the thickness direction by the upstream horizontal rolling mill 5 is installed over the entire length, and the slab 2 is heated and softened. ing.

The downstream horizontal rolling mill 8 includes a pair of work rolls 17a, 17b facing each other up and down with the transport line S interposed therebetween.
And pressing rolls 18a and 18b abutting the work rolls 17a and 17b from the side opposite to the transport line, and pressing a shaft box pivotally supporting the journal portion of the upper holding roll 18a with a pressing means such as a screw jack (FIG. (Not shown) toward the transport line S, the two work rolls 17
The slab 2 inserted between a and 17b is pressed down in the thickness direction.

Further, the gas cutter 3 and the first edger 4
Between the first edger 4 and the upstream horizontal rolling mill 5, between the upstream horizontal rolling mill 5 and the second edger 6,
Between the second edger 6 and the recuperator 7, inside the recuperator 7, and between the recuperator 7 and the downstream horizontal rolling mill 8,
A table roller 19 that supports the slab 2 by rolling contact with the lower surface of the slab 2 is provided.

When the slab 2 is formed by the slab width reduction equipment shown in FIGS. 4 and 5, the slab 2 having a thickness of about 250 mm sent from the continuous casting machine 1 is cut by the gas cutter 3 to a predetermined length. Cut into pieces.

The slab 2 is moved toward the downstream side B in the conveying direction, and the entire length of the slab 2 is reduced by the first edger 4 in the width direction, and the upstream horizontal rolling mill 5 is pressed in the thickness direction. The reduction molding and the reduction molding in the width direction by the second edger 6 are sequentially performed.

When the slab 2 has passed through the second edger 6, the slab 2 is moved toward the upstream side A in the transport direction, and the second edger 6 is pressed down in the width direction over the entire length of the slab 2. Then, the upper side horizontal rolling mill 5 sequentially performs reduction in the thickness direction, and the first edger 4 performs reduction in the width direction.

When the width of the slab 2 is reduced to a predetermined size by repeating the above-mentioned operation, the slab 2 is inserted into the recuperator 7, and the slab 2 heated and softened by the recuperator 7 is transferred downstream in the transport direction. The slab 2 is moved toward the side B and the slab 2 is pressed down in the thickness direction by the downstream horizontal rolling mill 8.

[0015]

However, in the slab width reduction equipment shown in FIGS. 4 and 5, the slab 2 is reciprocated with respect to the first edger 4, the upstream horizontal rolling mill 5, and the second edger 6. Since the width of the slab 2 is reduced, a drawer location corresponding to the length of the slab 2 is provided on each of the upstream A side in the transport direction of the first edger 4 and the downstream B side in the transport direction of the second edger 6. It is necessary to provide it, and the equipment becomes long.

In the down-pressing of the slab 2 in the width direction by the edgers 4 and 6, the contact length of the vertical rolls 13a, 13b, 16a and 16b in contact with the edge of the slab 2 in the width direction is short. As a result, the amount of deformation in the vicinity of the edge in the width direction of the slab 2 is larger than that in the vicinity of the center in the width direction. As shown in FIG. As shown in FIG.
The slab 2 has a planar shape in which a protruding portion 2a is formed extending from the vicinity of the width direction edge toward the downstream B side and the upstream A side in the conveying direction at the downstream B side end and the upstream A side end. It has a tail shape, and the yield of the slab 2 is reduced.

When each end of the slab 2 has a fishtail shape, a tensile stress is generated in the longitudinal direction near the center of the slab 2 in the width direction, and a void (center porosity) is formed in the vicinity of the center of the slab 2. Is formed, and in particular, the slab 2
If is a steel alloy, the center porosity may open.

Therefore, the slab 2 is heated and softened by the recuperator 7 on the upstream side A in the transport direction of the downstream horizontal rolling mill 8 to reduce the tensile stress and to suppress the opening of the center porosity. There is.

The present invention has been made in view of the above circumstances, and has as its object to suppress the formation of a dogbone in a cross section in the slab width direction and the formation of a fishtail in a slab plane shape.

[0020]

In order to achieve the above object, in the method for reducing the slab width according to claim 1 of the present invention,
The slab sent from the continuous casting machine and cut to a predetermined length is pressed down in the width direction by causing a pair of plate width reduction dies facing the slab width direction to intersect with each other with the conveyance line interposed therebetween, and to be pressed down in the width direction. The slab that has been pressed down is pressed down in the thickness direction by a horizontal rolling mill equipped with a pair of work rolls that face each other up and down across the transport line.

In the slab width reduction equipment according to the second aspect of the present invention, the slab width reduction equipment is provided so as to face the slab width direction with the conveyance line interposed downstream of the cutting device for cutting the slab sent from the continuous casting machine. A slab width press device having a pair of plate width reduction dies that can approach and separate from each other is arranged, and a pair of work rolls that are vertically opposed to each other across a conveyance line are provided downstream of the slab width press device in the conveyance direction. A horizontal rolling mill is arranged.

In the slab width reduction equipment according to claim 3 of the present invention, in addition to the configuration of the slab width reduction equipment according to claim 2 of the present invention, the slab width reduction equipment faces the slab width direction with a transfer line interposed therebetween. And a pair of mold seats that can approach and separate from the transfer line, a mold mounted on the mold seat so as to face the transfer line, and installed on the opposite transfer line side of the mold seat and An axle box which can be moved toward and away from the transfer line by a reduction amount setting actuator, a crankshaft pivotally supported by the axle box, a base end pivotally supported by an eccentric portion of the crankshaft, and a tip end formed by a mold. The slab width pressing device is constituted by the rod pivotally supported on the seat.

In the slab width reduction method according to the first aspect of the present invention, a pair of plate width reduction molds facing each other in the slab width direction with the conveyance line interposed therebetween are separated from each other, and the high temperature inserted into the conveyance line is reduced. Of the slab in the width direction with a plate width reduction die having a sufficient contact length with the width direction edge of the slab, thereby forming a dog bone in the slab width direction cross section and a fish having a slab plane shape. The tailing is suppressed, and the slab is pressed down in the thickness direction with a pair of work rolls facing up and down with the transport line interposed therebetween, thereby smoothing the cross-sectional shape in the slab width direction.

In any one of the slab width reduction apparatuses according to the second and third aspects of the present invention, the pair of plate width reduction dies of the slab width pressing device are moved close to and away from each other, and the high temperature Of the slab in the width direction with a plate width reduction die having a sufficient contact length with the width direction edge of the slab, thereby forming a dog bone in the slab width direction cross section and a fish having a slab plane shape. The tailing is suppressed, and the slab is pressed down in the thickness direction with a pair of work rolls of a horizontal rolling mill to smooth the cross-sectional shape in the slab width direction.

In the slab width reduction equipment according to the third aspect of the present invention, the space between the left and right axle boxes is changed by a reduction amount setting actuator to adjust the reduction amount of the plate width reduction mold to the slab 2. I do.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the slab width reduction equipment according to the present invention. In the drawings, the same reference numerals as those in FIGS. 4 and 5 denote the same parts.

The slab width reduction equipment is provided in the conveying direction upstream A
Slab 2 delivered from continuous casting machine 1 arranged at the side end
A slab width press device 20 and a horizontal rolling mill 21 are arranged in order along the transport line S on the downstream side B in the transport direction of the gas cutter 3 for cutting the slab.

The slab width press 20 is shown in FIGS.
As shown in FIG. 5, a pair of mold seats 22a and 22b facing each other in the slab width direction with the transfer line S interposed therebetween and capable of approaching to and separating from the transfer line S, and the transfer line S is connected to the mold seats 22a and 22b. Dies 23a, 23 mounted to face each other
b and mold reciprocating mechanisms 24a and 24b provided on the side opposite to the transport line of the mold seats 22a and 22b, respectively.

The mold seats 22a and 22b are adapted to move horizontally in a direction substantially orthogonal to the transport line S along guide members 25a and 25b provided on the side of the transport line S.

As shown in FIG. 3, the molds 23a and 23b have flat forming surfaces 26a and 26b gradually approaching the transfer line S from the upstream A side to the downstream B side in the transfer direction. , 26b and molding surfaces 27a, 27b facing in parallel with the transport line S, and the height of the molding surfaces 26a, 26b, 27a, 27b is
Is set according to the thickness of the sheet.

The mold reciprocating mechanisms 24a and 24b are installed on the side opposite to the transport line of the mold seats 22a and 22b and are screw jacks (actuators for setting the amount of reduction) 2.
8a, 28b, the shaft boxes 29a, 29b capable of moving toward and away from the transport line S, the crankshafts 30a, 30b pivotally supported by the shaft boxes 29a, 29b and extending vertically, and the base ends of the crankshafts 30a, 30b. 30b each eccentric part 3
1a, 31b and the tip end is a mold seat 22a, 2b.
2b, rods 33a, 33b pivotally supported by brackets 32a, 32b.

The rotational force of a motor (not shown) is transmitted to the crankshafts 30a and 30b via a rotation tuning mechanism such as a gear box. When the motor is operated, the crankshaft 30a , 30b eccentric 31a,
The displacement of 31b is caused by the rods 33a, 33b and the mold seat 22.
The light is transmitted to the left and right dies 23a and 23b via the first and second dies 23a and 23b.

The screw jacks 28a, 28b
Is operated, the distance between the left and right axle boxes 29a, 29b changes, and thereby the distance between the dies 23a, 23b, that is, the amount of reduction of the slab 2, is adjusted.

Further, on the upstream A side and the downstream B side in the conveying direction of the slab width press device 20, the downstream end of the slab 2 to be pressed and formed in the conveying direction downstream B side is securely inserted between the left and right dies 23a, 23b. It is preferable to provide a side guide for moving the end of the slab 2 downstream in the transport direction B side along the transport line S after being guided and pressed down by the dies 23a and 23b.

The horizontal rolling mill 21 is provided with a pair of work rolls 14a and 14b vertically facing each other with the transport line S interposed therebetween, and stub rolls 15a and 15b contacting the respective work rolls 14a and 14b from the side opposite to the transport line. The axle box pivotally supporting the journal portion of the upper stay roll 15a is transported to the transfer line S by pressing means (not shown) such as a screw jack.
By pressing toward both work rolls 14a, 1
The slab 2 inserted between the slabs 4b is pressed down in the thickness direction.

Further, between the gas cutter 3 and the slab width pressing device 20, the slab width pressing device 20 and the horizontal rolling mill 21 are provided.
And a table roller 19 that supports the slab 2 by rollingly contacting the lower surface of the slab 2 on the downstream side B in the transport direction of the horizontal rolling mill 21.

When the slab 2 is formed by the slab width reduction equipment shown in FIGS. 1 to 3, the slab width pressing device 2
0 screw jacks 28a and 28b are appropriately operated,
Left and right axle boxes 29a, 2 of the mold reciprocating mechanisms 24a, 24b
9b, the axle box 29a,
Left and right molds 23 connected via rods 33a, 33b to crankshafts 30a, 30b pivotally supported by 29b.
The distance between a and b is adjusted, and the amount of reduction in the width direction of the slab 2 is set.

Next, a motor (not shown) of the slab width pressing device 20 is operated, and the crankshafts 30a and 30b are rotated via a rotation tuning mechanism such as a gear box, so that the left and right dies 23a and 23b are transferred to the transfer line. The slab 2 having a thickness of about 250 mm sent out from the continuous casting machine 1 is cut into a predetermined length by the gas cutter 3 while being separated from and approaching the S, and is transferred from the upstream side A in the transport direction to the downstream B side in the transport direction. Table roller 1 along the transport line S
9 Move on top.

The slab 2 guided on the table roller 19 so as to pass between the left and right dies 23a and 23b of the slab width pressing device 20 is moved toward and away from the transport line S. By 23b, the sheet is subjected to width-direction reduction forming over the entire length and is reduced to a predetermined width.

The slab 2 sent out from the slab width press 20 moves on the table roller 19 along the transport line S, and is moved downstream B in the transport direction of the slab width press 20.
The sheet is subjected to reduction in the thickness direction by a horizontal rolling mill 21 provided on the side, and is reduced and formed into a cross-sectional shape having a predetermined dimension.

As described above, in the slab width reduction equipment shown in FIGS. 1 to 3, immediately after being sent out from the continuous casting machine 1, both inside and outside exhibit a solid phase, the temperature of the outside portion is about 800 ° C., and the inside temperature is about 800 ° C. Is maintained at a high temperature of about 1200 ° C., and the width of the slab 2 having a soft inside is reduced by moving a pair of molds 23 a and 23 b having a sufficient contact length to the edge in the width direction of the slab 2 toward and away from each other. Slab 2
The slab 2 is entirely deformed in the width direction without deforming only the side edge vicinity portion of the slab, and the dogbone of the slab width direction cross section and the fishtail of the slab plane shape are suppressed, and the center porosity is improved, The tensile stress at the center in the width direction of the slab 2 due to the fishtail of the slab plane shape can be reduced.

Further, since the fish tail of the slab plane shape can be suppressed, the yield of the slab 2 is improved.

Furthermore, since it is not necessary to reverse the slab 2 and to provide a recuperator 7 for reheating the slab 2, it is possible to reduce the equipment length.

The method and equipment for reducing the slab width according to the present invention are not limited to the above-described embodiment.
Of course, changes can be made without departing from the spirit of the present invention.

[0046]

As described above, according to the slab width reduction method and equipment of the present invention, the following various excellent effects can be obtained.

(1) A high-temperature slab delivered from a continuous casting machine and having a soft inside is placed in a width direction by moving a pair of molds having a sufficient contact length to a side edge of the slab close to and away from each other. Since the roll-forming is performed, the slab is entirely deformed in the width direction without deforming only the side edge vicinity portion of the slab, and the dog bone in the slab width direction cross section and the fish tail in the slab plane shape are suppressed, and the center is formed. The porosity can be improved, and the tensile stress at the center of the slab in the width direction due to the fishtail of the slab planar shape can be reduced.

(2) Since it is possible to suppress the formation of fishtail in the slab plane shape, the slab yield is improved.

(3) There is no need to reverse the slab,
Since there is no need to provide a recuperator for reheating the slab, it is possible to reduce the equipment length.

[Brief description of the drawings]

FIG. 1 is a side view of an example of an embodiment of a slab width reduction method and equipment according to the present invention.

FIG. 2 is a plan view related to FIG. 1;

FIG. 3 is a plan view of the slab width pressing apparatus related to FIG. 1;

FIG. 4 is a side view schematically showing a conventional slab width reduction device.

FIG. 5 is a plan view related to FIG. 4;

FIG. 6 is a sectional view showing a deformation of the slab section related to FIG. 4;

FIG. 7 is a plan view showing the deformation of the slab end related to FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Continuous casting machine 2 Slab 3 Gas cutting device (cutting device) 14a Work roll 14b Work roll 20 Slab width press device 21 Horizontal rolling machine 22a Die seat 22b Die seat 23a Die (plate width reduction die) 23b Die (Sheet width reduction mold) 28a Screw jack (actuator) 28b Screw jack (actuator) 29a Shaft box 29b Shaft box 30a Crankshaft 30b Crankshaft 31a Eccentric part 31b Eccentric part 32a Bracket 32b Bracket 33a Rod 33b Rod B Transport direction downstream S Transport line

Claims (3)

[Claims] 1. A slab delivered from a continuous casting machine and cut to a predetermined length is reduced in a width direction by causing a pair of plate width reduction dies facing each other in the width direction of the slab across a transfer line to approach and separate from each other. The slab that was molded and pressed down in the width direction was
A slab width reduction method characterized in that a slab width reduction is performed in a thickness direction by a horizontal rolling mill having a pair of work rolls facing each other up and down with a conveyance line interposed therebetween. 2. A pair of plate width reduction dies facing a slab width direction across a conveyance line and capable of approaching and separating from each other are provided downstream of a cutting device for cutting a slab sent from a continuous casting machine. A slab width press having a slab width press device, and a slab width characterized by arranging a horizontal rolling mill provided with a pair of work rolls vertically opposed to each other across a transfer line on the downstream side in the transfer direction of the slab width press device. Reduction equipment. 3. A pair of mold seats facing each other in the slab width direction across the transfer line and capable of approaching and separating from the transfer line, and a mold mounted on the mold seat so as to face the transfer line. A shaft box installed on the side opposite to the transfer line of the mold seat and capable of approaching / separating from the transfer line by a rolling amount setting actuator; a crankshaft pivotally supported by the shaft box; 3. The slab width pressing device according to claim 2, wherein a slab width pressing device is constituted by a rod pivotally supported by an eccentric portion of a crankshaft and a tip portion pivotally supported by a mold seat.