JP2002066703A - Slab supporting device in continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slab supporting device of low running cost, equipped with diameter-reducible support rolls having long-durable rotation support members. SOLUTION: The support roll comprises a sleeve-supporting arbor whose outer surface serves for sliding and a sleeve whose inner diameter is larger than the outer diameter of the arbor and its internal surface serves for sliding. The sleeve-supporting arbor is inserted into the sleeve to form a support roll, allowing the sleeve to rotate, sliding and contacting the outer surface of the arbor, while at least both ends of the arbor are fixed. Furthermore cooling device is installed to cool the outer surface of the support roll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab supporting device provided with a support roll for supporting a slab.

[0002]

2. Description of the Related Art In a continuous casting machine, a slab cast by a mold is drawn out by a pinch roll and supported by a slab supporting device provided with a support roll. As shown in FIGS. 4 and 5, the conventional slab support device 30 includes a support roll 20, and has a support structure in which the support roll 20 is rotatably supported by a roller bearing 25 mounted in a bearing box 23. ing.

FIGS. 4 and 5 show a slab supporting device 30 on one side of the slab 1. In this example, the support roll 20 is supported at both ends and an intermediate portion in the roll axis direction. are doing. The support roll 20 is formed as an integral roll by fixing the outer layer sleeve 21 and the inner layer arbor 22 by shrink-fitting, and generally has a cooling hole 24 and a groove 21a communicating with the cooling hole 24 inside the support roll 20. By providing cooling water into the cooling groove 21a along the roll axis direction, the outer sleeve 21 that contacts the hot slab 1 is cooled from the inside.

[0004] The bearing box 23 is usually mounted on a base on a foundation provided in a continuous casting machine. In recent years, the roll pitch of the support rolls has been reduced and the diameter of the support rolls has been reduced in order to increase the casting speed and improve the production capacity of the slabs while preventing internal defects of the slabs.

At this time, in a continuous slab casting machine for producing a wide cast slab, as shown in FIG. 4, from the viewpoint of securing the roll strength, the slab is supported at an intermediate portion of the support roll to extend the life of the support roll. It is common practice to prevent deterioration. However, in the conventional slab support device, as shown in FIG. 4, for example, the support structure is such that the support roller 20 is rotatably supported by a roller bearing 25 mounted in a bearing box 23. In some cases, the life of the bearing is shortened, the maintenance cost required for the service life is high, and the running cost of the slab supporting device including the bearing of the support roll is high.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art in a continuous casting machine, and to provide a support roll capable of reducing the diameter,
An object of the present invention is to provide a slab support device that has a long life of a rotation support portion of a support roll and has low running cost.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a sleeve support shaft having a slip surface formed on an outer surface, a sleeve having an inner diameter larger than the outer diameter of the sleeve support shaft, and having a slip surface formed on an inner surface. And a plurality of frames, wherein at least both ends of the sleeve support shaft are fixed to the frame, and the sleeve is rotatably and slidably contacted with the sleeve support shaft to form a support roll. A slab support device in a continuous casting machine, wherein a cooling means capable of cooling the outer surface of the slab is arranged.

Further, the sleeve support shaft may be provided with a greasing hole communicating with both the gap on the slab side between the outer surface of the sleeve support shaft and the inner surface of the sleeve and the gap on the mount side opposite thereto. It is a slab support device in a preferred continuous casting machine. The slab support roll preferably divides the sleeve at an axially intermediate portion of the sleeve support shaft and fixes the sleeve support shaft at the split position.

The cooling means may be a spray, and a wiper directed toward the surface of the support roll forward or rearward in the rotational direction of the support roll from the surface position of the support roll cooled by the spray. The slab support roll is more preferably provided with wipers facing the surface of the support roll on both front and rear sides in the rotation direction of the support roll.

The slab supporting roll is preferably such that a wiper provided in front of the support roll in the rotation direction is a rubber wiper, and a wiper provided rearward in the rotation direction of the support roll is an air wiper.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A slab supporting apparatus according to the present invention will be described below in detail with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 is a layout diagram of rolls in a continuous casting machine to which the present invention is applied, and FIG. 2 is a cross-sectional view showing a structure of a support roll of a slab supporting device according to an embodiment of the present invention. Also,
FIG. 3 is a cross-sectional view taken along the line YY of FIG. 2 and is a layout view of a spray nozzle and a wiper in the slab support device according to the embodiment of the present invention.

In the drawing, 1 is a cast piece, 2 is a mold, 3
Denotes a pinch roll and 4 denotes a support roll. Also, 5
Is a frame, 6 is a sleeve support shaft, 7 is a sleeve, 8 is a greasing hole, 10 is a spray nozzle (cooling means), 11
a and 11b are wipers, 12 is a slab support device, and G is a gap.

Reference numeral 7a denotes a groove, and 9 denotes a stopper. The continuous casting machine to which the present invention is applied is a vertical bending type shown in FIG. In the continuous casting machine to which the present invention is applied, as shown in FIG. 1, a slab 1 cast by a mold 2 is drawn out by a pinch roll 3 and supported by a slab support device provided with a support roll 4. .

As shown in FIG. 1, the slab supporting apparatus provided with the support rolls 4 of the present invention is usually pinched with the support rolls 4 or with the support rolls 4 so as not to apply an excessive force to the slabs 1. The slab 1 is rotatably supported with the slab 1 sandwiched between the rolls 3 to prevent the slab 1 from being deformed such as bulging. A slab support device 12 on one side of the slab 1 of the support roll 4 shown in FIG. 1 is shown in FIGS.

2 and 3, the lower side is shown as a gantry side of the continuous casting machine to which the frame 5 is mounted, and the upper side is shown as a slab side. As shown in FIGS. 2 and 3, the support roll 4 provided in the slab support device 12 of the present invention includes a sleeve support shaft 6 having a slip surface formed on the outer surface and a sleeve support shaft 6 having a slip surface formed on the inner surface. And a sleeve 7 having an inner diameter larger than the outer diameter of the sleeve 6. At least both ends of the sleeve support shaft 6 are fixed, and the sleeve 7 is mounted on the sleeve support shaft 6 so as to be rotatable and in sliding contact. It is set to 4. Here, the sleeve support shaft 6 is
Both ends and an intermediate portion are fixed to a frame 5 attached to a frame of a continuous casting machine.

The material of the sleeve support shaft 6 is, for example, SCM435, 21CrMoV511, etc. The material of the sleeve 7 corresponding to this material is SUS630, 13 respectively.
Cr4Ni or the like can be used. As described above, in the present invention, the support structure of the support roll 4 for rotatably supporting the sleeve 7 with the sleeve support shaft 6 fixed to the frame 5 is provided. For example, as shown in FIG. A greasing hole 8 communicating with the gap G between the inner surfaces of the sleeve 7 is provided, and when the cast piece 1 is cast, grease is forcibly lubricated into the greasing hole 8 so that the sleeve supporting shaft 6 is formed.
The rotation support between the sleeve and the sleeve 7 can be in sliding contact via an oil film.

Therefore, the rotation of the support roll 4 can be made smooth, and the rotation supporting portion of the support roll 4 can have a long life. In addition, since the sleeve 7 is supported by the sleeve support shaft 6 fixed to the frame 5, the diameter of the sleeve 7 can be reduced to about the same size as the conventional one without any problem. Further, in the present invention, a spray nozzle 10 capable of cooling the outer surface of the support roll 4 is provided.

Therefore, for example, by spraying cooling water onto the surface of the sleeve 7 from the spray nozzle 10 shown in FIG. 3, the surface temperature of the sleeve 7 can be kept low during casting, so that the life of the support roll 4 can be extended. . FIG.
Although the cooling means for spraying from the spray nozzle 10 is shown, the cooling means of the present invention is not limited to this. For example, the cooling means may be a cooling jacket which covers the outer peripheral surface along the axial direction of the support roll 4. You can also.

Here, the greasing hole 8 provided in the sleeve support shaft 6 is provided along the axis of the sleeve support shaft 6 from the end face of the sleeve support shaft 6 to reach the intermediate portion, as shown in FIG. A plurality of greasing holes 8 penetrating from the outer surface of the sleeve support shaft 6 on the slab side to the outer surface of the gantry side along the direction sandwiching the slab are provided. It is communicated at the position. When the sleeve 7 is mounted on the sleeve support shaft 6 to form the support roll 4, the greasing hole 8 provided in the sleeve support shaft 6 forms a gap between the outer surface of the sleeve support shaft 6 and the inner surface of the sleeve 6 as shown in FIG. Are provided so as to communicate with both the gap G on the slab side and the gap G on the gantry side opposite thereto.

A gap G can be formed between the outer surface of the sleeve support shaft 6 and the inner surface of the sleeve 7 as shown in FIG. 3 (the gap is enlarged in FIG. 3). Both ends in the direction of the support shaft 6 are sealed by appropriate seal rings provided on the inner peripheral surfaces of both ends of the sleeve 7 divided into two parts. The groove 7a is provided on the inner surface of the sleeve 7 along the circumferential direction.

In the present invention, the greasing hole 8 is provided with a gap G on the slab side between the outer surface of the sleeve support shaft 6 and the inner surface of the sleeve 6.
It is preferable to provide the gap G on both sides of the pedestal and the opposite side. The reason for this is that, when the slab 1 is cast, if grease is forcibly supplied to the greasing hole 8 from the end face, the grease is forcibly applied to both the gap G on the slab side and the gap G on the gantry side opposite thereto. Can be surely brought into sliding contact between the outer surface of the sleeve support shaft 6 and the inner surface of the sleeve 7 via an oil film, and can be smoothly rotated and supported with the slab 1 interposed therebetween. ,
This is because the rotation supporting portion of the support roll 4 can have a much longer life.

In the present invention, grease is forcibly supplied, but oil may be forcibly supplied. In FIG. 2, the sleeve 7 is divided at an intermediate portion in the axial direction, and the sleeve support shaft 6 at the divided axial position is fixed to the frame 5 because a wide slab is cast. In this case, by supporting the sleeve support shaft 6 at the intermediate portion, the diameter of the support roll 4 is reduced and the roll pitch is shortened.

However, in the present invention, the sleeve can be divided into two or more parts. When the width of the cast piece is narrow, the sleeve does not have to be divided. Further, in the slab supporting device 12 of the present invention, as shown in FIG. 3, the cooling means is sprayed from the spray nozzle 10, and the cooling means is supported by the surface position of the support roll 4 cooled by the spray from the spray nozzle 10. It is preferable to provide a wiper facing the surface of the support roll 4 on either the front side or the rear side in the rotation direction of the roll 4 because supercooling of the cast piece 1 can be suppressed. It is more preferable to provide wipers facing the surface of the support roll 4 on both sides, since supercooling of the slab can be remarkably suppressed.

The cooling means is sprayed from the spray nozzle 10 because the apparatus is simple and the running cost can be reduced. In FIG. 3, it is preferable that the front wiper be a rubber wiper and the rear wiper be an air wiper, because the running cost for preventing excessive cooling of the slab can be further reduced. However, the front wiper can be a contact wiper made of a material other than rubber, and the rear wiper can be a gas wiper other than air.
The wipers on both sides may be gas wipers.

The slab supporting device 12 provided on one side of the slab 1 provided with the support roll 4 has been described above. However, when the slab 1 is sandwiched between the support rolls 4 shown in FIG. The slab support device 12 is arranged in a continuous casting machine with the support rolls 4 facing each other so as to sandwich
In the case where the slab 1 is sandwiched between the support roll 4 and the pinch roll 3 shown in FIG. 2, the slab support device 12 having the support roll 4 and the pinch roll 3 are provided with the rolls facing each other so as to sandwich the slab 1. It is located on a continuous casting machine.

In FIG. 1, the vertical bending type is used, but the continuous casting machine to which the present invention is applied is not limited to the vertical bending type. Further, the number and positions of the rolls of the continuous casting machine to which the present invention is applied are not limited to those shown in FIG. 1, and the number of the pinch rolls 3 and the support rolls 4 and the support rolls disposed between the pinch rolls 3 4
The number of arrangements may be determined as appropriate depending on the slab to be manufactured, production capacity, and the like.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a continuous casting machine to which the present invention is applied as shown in FIG. 1, a slab 1 cast by a mold 2 is drawn out by a pinch roll 3 and supported by a slab support device 12 provided with a support roll 4. Inventive Examples. On the other hand, in the conventional example, FIG.
In the continuous casting machine shown in FIG. 5, a slab supporting device 30 having a support roll 20 shown in FIGS.
The diameter of the roll is 1.25 times that of the present invention, and the roll pitch is 1.25 times that of the present invention.
Doubled.

According to the present invention, the number of rolls is increased by about 8 in total as compared with the prior art. Table 1 shows the service life, running cost, and slab production capacity of the continuous casting machine of the slab support device in the invention example and the conventional example.

[0029]

[Table 1]

From the results of the life of the slab support device, the running cost, and the production capacity of the slab of the continuous casting machine shown in Table 1, in the example of the present invention, the roller life of the support roll can be made longer than that of the conventional example, and the roller bearing has a shorter life. As a result, the running cost of the slab support device was greatly reduced. Further, in the invention example, by reducing the roll pitch of the support roll as compared with the conventional example, the production capacity of the slab could be increased.

In the present invention, the reason why the production capacity of the slab is increased is that the bulging of the slab hardly occurs and the casting speed can be increased by reducing the roll pitch of the support roll.

[0032]

According to the present invention, a support roll whose diameter can be reduced can be provided, and the rotation support portion of the support roll can have a long life. For this reason, the running cost of the slab support device can be reduced, and the roll pitch of the support roll can be shortened, so that there is an industrially beneficial effect that the slab production capacity can be increased.

[Brief description of the drawings]

FIG. 1 is a layout diagram of rolls in a continuous casting machine to which the present invention is applied.

FIG. 2 is a sectional view showing a structure of a support roll of the slab support device according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line YY of FIG. 2, and is a layout view of a spray nozzle and a wiper in a slab support device according to an embodiment of the present invention.

FIG. 4 is a sectional view showing the structure of a conventional support roll. It is.

FIG. 5 is a sectional view taken along the line XX of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cast piece 2 Mold 3 Pinch roll 4, 20 Support roll 5 Frame 6 Sleeve support shaft 7, 21 Sleeve 7a, Groove 8 Greasing hole 9 Retainer 10 Spray nozzle (cooling means) 11a, 11b Wiper 12, 30 Cast piece support Device G Clearance 21 Arbor 21a Cooling groove 23 Bearing box 24 Cooling hole 25 Roller bearing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16C 13/00 F16C 13/00 E 13/02 13/02 17/02 17/02 Z 33/08 33 / 08 33/10 33/10 Z F term (reference) 3J011 AA01 AA07 AA09 BA03 CA01 JA02 KA02 LA04 MA06 MA12 MA26 MA27 QA01 SB02 3J103 AA02 AA12 AA17 AA41 AA45 AA73 AA83 BA13 CA23 CA36 CA72 CA78 DA03 FA19 FA26 GA03 GA06 HA36 HA15 HA32 HA33 4E004 LC02 LC03 LC05 LC10 MD04

Claims (6)

[Claims] A sleeve supporting shaft having a sliding surface formed on an outer surface, a sleeve having an inner diameter larger than an outer diameter of the sleeve supporting shaft and a sliding surface formed on an inner surface, and a plurality of frames; At least both ends of the sleeve support shaft are fixed to the frame, and the sleeve is mounted on the sleeve support shaft so as to be rotatable and in sliding contact with each other to form a support roll, and cooling means capable of cooling the outer surface of the support roll. A slab support device in a continuous casting machine, wherein a slab is disposed. 2. A method according to claim 1, wherein said sleeve support shaft is provided with a greasing hole communicating with both the gap on the slab side between the outer surface of said sleeve support shaft and the inner surface of said sleeve and the gap on the pedestal side on the opposite side. The slab supporting device in the continuous casting machine according to claim 1, characterized in that: 3. The sleeve support shaft according to claim 1, wherein the sleeve is divided at an axially intermediate portion of the sleeve support shaft, and the sleeve support shaft at the division position is fixed.
6. A slab support roll in the continuous casting machine according to 5. 4. A wiper wherein the cooling means is a spray, and a wiper is directed toward the surface of the support roll forward or rearward in the rotation direction of the support roll from a surface position of the support roll cooled by the spray. The slab support device in the continuous casting machine according to any one of claims 1 to 3, further comprising: 5. The cooling means is a spray, and wipers are provided on both sides of the support roll, which are cooled by the spray, on the front and rear sides in the rotation direction of the support roll, facing the surface of the support roll. The slab supporting device in the continuous casting machine according to any one of claims 1 to 3, characterized in that: 6. The continuous casting according to claim 4, wherein the wiper provided in front of the support roll in the rotation direction is a rubber wiper, and the wiper provided in the rear direction of the support roll in the rotation direction is an air wiper. Slab support device in the machine.