JPH01321054A - Device for supporting rolling reduction of continuously cast slab - Google Patents

Abstract

PURPOSE:To substantially execute rolling reduction only to non-solidified layer in a cast slab, to reduce the rolling reduction force by half and to stabilize inner quality of the cast slab by arranging rolling reduction liner to be possible to change into contacting state or non-contacting state with the cast slab surface at contacting part of an inner and an outer bars with the cast slab positioning at both sides to width direction of the cast slab in the title device. CONSTITUTION:At the time of executing the rolling reduction of the cast slab 3, cylinder 32 in the outer bar 12 or further the inner bar 13 positioning to the whole width part of solidified layers 6 at both sides is worked in accordance with the width size of the cast slab 3. In this result, the rolling reduction liner 29 connecting with the cylinder 32 is shifted to the outer bar 12 and the inner bar 13 along dovetail grooves 30. In this case, as the reverse tapered face having inclination in the groove 30 is formed, the contacting face of the liner 29 with the cast slab is made to non-contacting state to the surface of the cast slab 3. Under this condition, at the time of executing the rolling reduction of the cast slab 3, as the rolling reduction is executed to the non-solidified layer 2 at the center of the cast slab 3 contacting with the liner 29 and is not executed to the non-contacting solidified layer 6 at both sides of the cast slab 3, the rolling reduction is executed only to the layer 2, and as the rolling reduction force needed at this time is very little, load to the equipment can be drastically reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a continuous slab rolling support device installed at a point where slabs solidify in continuous casting equipment.

[Prior Art] In continuous casting equipment, solidification shrinkage occurs at the position where the slab completely solidifies (see FIG. 7).

If this hard shrinkage is left untreated, deformation due to shrinkage will appear on the inner side as shown by the broken line in FIG. 7, and a void 1 will be created. In this gap 1, there is a flow of molten metal from the unsolidified layer 2, which causes segregation. Furthermore, the iron water pressure at the solidification position of the slab 3 is extremely high, and if there is a flow of molten metal into the void 1, bulging may occur.

In order to eliminate the problems caused by the solidification shrinkage mentioned above,
As shown by the two-dot chain line in FIG. 7, a device is required that continuously applies a reduction corresponding to the amount of solidification shrinkage and supports the slab in a straight line by pressing the outer surface with a certain load to prevent bulging.

An example of this device is shown in FIGS. 8 to 11.

FIG. 8 is a schematic diagram of continuous casting equipment, in which 4 indicates a mold and 5 indicates a pinch roll. The slab 3 cast from the mold 4 is supported and guided by the pinch roll 5, and is also cooled during its progress. , the solidified layer 6 gradually grows and reaches the slab rolling support device 7. The slab rolling support device 7 supports the slab 3 in a rolling manner, and the unsolidified layer 2 of the slab 3 is completely eliminated within the slab rolling support device 7.

This slab rolling support device 7 is provided with upper and lower bar blocks 8, 9, the slab 3 is held between the bar blocks 8, 9, and the bar blocks 8, 9 are moved together with the slab 3. The upper and lower bar blocks 8.9 have the same structure, and the structure of the upper bar block 8 will be briefly described below.

The upper bar block 8 consists of an outer bar unit 10 and an inner bar unit 11, including a plurality of outer bars 12 extending in the line direction constituting a part of the outer bar unit IO and a plurality of outer bars 12 extending in the line direction constituting a part of the inner bar unit 11. A plurality of extending inner bars 13 are arranged at intervals in the width direction, and the outer bar 12 is integrated with both end beams 14.14 and a bridge 15.15 to form an outer bar unit 10, and the inner bar 13 has a central beam 16,
Integrated with slide block 17 to form inner bar unit 11
Nasu.

Furthermore, the central beam 16 is fitted into a space 18 formed by the end beams 14.14 and the bridges 15.15, and the slide block 17 is fitted into both bridges 15.15 and assembled, and both units 10. 11 is designed to be relatively movable in the slab advancing direction.

Both units 10.11 are pulled upward with the required force by a balance cylinder (not shown) connected to a bracket 19.20, and rails 21a, 21b, 22a, 22b are provided on the upper surface of both units 10.11. are provided, and wheels 2 are provided on the rails 21a, 21b, 22a, 22b.
3a, 23b, 24a, and 24b are brought into contact with each other in a freely rolling manner. Wheels 23a, 23b, 24a, 24b
The shafts 25a and 25b that support the outer bar unit 1 are eccentric in their wheel support portion and the portion supported by the housing.
0, wheels 23a, 23b, 24a on the inner bar unit 11
, 24b are alternatively in contact with and the reduction cylinder 26a,
Wheels 23a, 23b, 24a, 24 by 26b
A reduction blade can be applied to both units 10.11 via b.

Thus, both units 10.
11 are moved forward and backward with a phase shift of approximately 180 degrees, and furthermore, in the advance process of the unit, the cylinders 27, 28, the reduction cylinders 28a, 2 are pressed so that the wheels press the unit against the slab 3.
If Efb and the rotation of the shafts 25a and 25b are made to work together,
Both units 10.11 alternately press down and support the slab 3.

[Problems to be Solved by the Invention] However, in the conventional continuous slab rolling support device described above, as shown in FIG. Therefore, since the solidified layers 6 on both sides of the slab 3 in the width direction, which do not require rolling down, are rolled down at the same time without distinguishing them, unless a rolling blade large enough to roll down the solidified layer B is applied, the unsolidified layer will be removed. 2 could not be rolled down, and as a result, a rolling blade much larger than that required to roll down only the unsolidified layer 2 was required, and the equipment load had to be set excessively.

Furthermore, if the slab reduction width is wide relative to the width of the unsolidified layer 2, the slab 3 will be rolled down unevenly in the width direction, resulting in large variations in the internal quality of the slab 3, which is a problem. Ta.

In view of the above-mentioned circumstances, the present invention substantially reduces only the unsolidified layer of the slab, thereby reducing the number of required rolling blades by half and significantly reducing the equipment load. At the same time, the unsolidified layer is uniformly rolled. The object of the present invention is to provide a continuous cast slab rolling support device that can stably improve internal quality.

[Means for Solving the Problems] The present invention provides a continuous slab rolling support device that supports the slab by pressing an outer bar and an inner bar against the slab intermittently and alternately, at least in the width direction of the slab. This device relates to a continuous slab rolling support device in which rolling liners that can be switched between contacting and not contacting the slab surface are provided at slab contact portions of an outer bar and an inner bar located on both sides.

[Function] Accordingly, in the present invention, each reduction liner of the inner bar and outer bar located on both sides in the width direction of the slab or the wedge piece etc. is subjected to longitudinal force depending on the width of the unsolidified layer in the slab If the rolling liner is moved in the direction or width direction to prevent the rolling liner from coming into contact with the slab, or to roll down the slab so that it comes into contact with the slab, substantially only the unsolidified layer of the slab is rolled down. will be halved.

At the same time, uniform reduction in the width direction of the slab is achieved,
Inconsistency in internal quality is eliminated, resulting in a significant quality improvement.

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

FIGS. 1 and 2 are explanatory diagrams of an embodiment of the present invention.

A reduction liner 29 is provided at the part of each outer bar 12 and inner bar 13 that comes into contact with the slab.

The rolling liner 29 is applied in the line direction (lychee longitudinal direction).
Each outer bar 1 is fitted with a dovetail groove 30 having a tapered surface.
2 and the inner bar 13 so as to be movable in the line direction,
Each reduction liner 29 is moved separately by a cylinder 32 extending in the line direction supported by a bracket 31 attached to the upstream end or downstream end of the outer bar 12 and the inner bar 13 to come into contact with the surface of the slab 3. , it is possible to switch to either a non-contact state.

When rolling down the slab 3, depending on the width dimension of the slab 3,
Outer bars 12 located at the full width portion of the solidified layer 6 on both sides of the slab 3
Alternatively, when the cylinder 32 of the inner bar 13 is actuated to move the reduction liner 29 connected to the cylinder 32 along the dovetail groove 30 with respect to the outer bar 12 and the inner bar 13, the dovetail groove 30 has a slope. Since the tapered surface is formed, the slab contacting surface of the moved reduction liner 29 does not come into contact with the surface of the slab 3.

When the slab 3 is rolled down in this state, the unsolidified layer 2 of the slab 3 core that is in contact with the rolling liner 29 is rolled down, and the solidified layer 6 on both sides of the slab 3 that is not in contact with the rolling liner 29 is not rolled down. Since rolling is performed only on the unsolidified layer 2 that truly requires rolling, and the rolling blade required at this time is very small, the load on the equipment can be reduced significantly.

In addition, since reduction is substantially performed only on the unsolidified layer 2 of the slab 3, non-uniformity in the internal quality of the slab 3 is eliminated, resulting in a significant improvement in internal quality.

FIG. 3 is an explanatory diagram of another embodiment of the present invention, in which the reduction liner 29 is moved into the cylinder 32 in a configuration substantially similar to that in FIG.
Instead of a system in which the outer bar 12 and the inner bar 13 are moved by a rotary drive device ( The power cylinder 34 is provided with a keyhole 35 that can be engaged and disengaged by the lock-like locking member 33 of the power cylinder 34 in the line direction with respect to the reduction liner 29. The locking members 33 of each power cylinder 34 are provided at equal intervals and moved in the line direction with respect to the outer bar 12 and inner bar 13, and the locking members 33 of each power cylinder 34 are located at positions corresponding to the moved keyholes 35.
By engaging these, the slab contacting surface of the rolling liner 29 is brought into a state where it does not come into contact with the surface of the slab 3, and only the unsolidified layer 2 of the core of the slab 3 can be rolled down.

FIGS. 4 and 5 are explanatory views of another embodiment of the present invention, in which the structure is substantially the same as that in FIG. Instead of providing a slope to the slab 30, the dovetail groove 36 is made horizontal, and the rolling liner 37' is in full contact with the surface of the slab 3, the rolling liner 38 is partially in contact with the surface of the slab 3, and does not come into contact with the surface of the slab 3. Prepare a reduction liner 39, etc., and use various reduction liners 37.3
8.39 are replaceably attached to the dovetail grooves 36 of the outer bar 12 and inner bar 13 as appropriate depending on the width dimension of the slab 3, so that only the unsolidified layer 2 at the center of the slab 3 can be rolled down. It is.

FIG. 6 is an explanatory view of still another embodiment of the present invention, in which an outer bar 12 and an inner bar 13 (
The lower surface 40 (hereinafter described as an outer bar) and the roll liner 4
1, each of the upper surfaces 42 of the wedge part 47 has tapered surfaces 43, 44 having opposite slopes to each other in the longitudinal direction thereof, and has similar tapered surfaces 45.degree. 46 between the tapered surfaces 43, 44.
A guide 48 is provided at the upstream end or downstream end of the outer bar 12 to support the reduction liner 41 in a vertically movable manner. A driving cylinder 49 for sliding the cylinder 47 in the longitudinal direction is supported via a bracket 50, and as in the other embodiments, only the unsolidified layer 2 can be rolled down.

It should be noted that the present invention is not limited to the above-mentioned embodiments,
Reduction liners do not necessarily need to be installed on all outer bars and inner bars, but only on an appropriate number of them located on both sides of the slab in the width direction, and multiple reduction liners should be provided on each outer bar and inner bar. The slope of each tapered surface 4B, 44, 45, 48 in the embodiment shown in FIG. 6 may be set in the width direction and the wedge piece 47 may be slid in the width direction. Of course, various changes may be made without departing from the spirit of the invention.

[Effects of the Invention] As described above, according to the continuous slab rolling support device of the present invention, at least the slab contacting portions of the outer bar and the inner bar located on both sides in the slab width direction are brought into contact with the slab surface. A reduction liner that can be switched between contact and non-contact conditions is installed, allowing only the unsolidified layer at the center of the slab width to be reduced, reducing the number of required reduction blades by half and significantly reducing the equipment load. Gain,
Various excellent effects can be achieved, such as uniform reduction in the width direction and the ability to manufacture slabs with good internal quality.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2 is a view taken along the ■-■ arrow in FIG. 1, and FIG. 3 is an explanatory diagram of another embodiment of the present invention.
FIG. 4 is an explanatory diagram of another embodiment of the present invention, FIG. 5 is a view from the ■-■ arrow in FIG. 4, FIG. 6 is an explanatory diagram of yet another embodiment of the present invention, and FIG. Explanatory diagram showing solidification shrinkage deformation of slab, No. 8
9 is a perspective view of the outer bar unit of the slab rolling support device, FIG. 10 is a perspective view of the inner bar unit, and FIG. 11 is an explanatory diagram of a conventional example. In the figure, I2 is the outer bar, 13 is the inner bar, 29.37.38
39 is a reduction liner, ao and ae are dovetail grooves, 32 is a cylinder, 33 is a locking member, 34 is a power cylinder, and 35 is a keyhole. Figure 1 Figure 2 Figure 3 Figure 4 Figure 8 Front 9 Figure

Claims (1)

[Claims] 1) In a continuous slab rolling support device that supports the slab by pressing the slab intermittently and alternately, the outer bar and the inner bar located at least on both sides in the width direction of the slab are 1. A continuous cast slab rolling support device, characterized in that a rolling liner is provided in one contact portion, and the rolling liner can be switched between a state in which it is in contact with the slab surface and a state in which it is not in contact with the slab surface.