JPS6230859B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drawing out a plurality of dummy bars in parallel in continuous casting equipment, in which three or more independent dummy bars are simultaneously inserted into and pulled out from the same slab guide device.

Generally, in continuous casting equipment, prior to pouring molten metal, the lower end of the open mold is closed with a dummy bar, and the dummy bar is held and supported by a drawing roll, and the drawing roll is driven. The dummy bar is used as a guide to sequentially pull out the slab from the mold, and the dummy bar and slab are separated through a secondary cooling device.

Conventionally, methods for inserting this dummy bar into a mold include an upward insertion method in which the dummy bar is inserted from the top of the mold, and a downward insertion method in which the dummy bar is fed backwards from the rear of the continuous casting machine and inserted from the bottom of the mold. .

Among these, the dummy bar downward insertion method requires a long time to insert the dummy bar because it is necessary to start inserting the dummy bar after casting in the mold is completed and the slab is removed from the secondary cooling zone. There were some shortcomings.

As a means of solving this drawback, an upward insertion method in which a dummy bar is inserted from above has been adopted, but the present inventors are aiming to achieve a body length that can simultaneously press multiple slabs cast in parallel. In order to apply the dummy bar upward insertion method to a casting method in which at least three slabs are cast in parallel using a slab guiding device formed by forming a slab, each dummy bar that guides each slab must be used as an independent dummy bar. and will be inserted individually through each mold opening.

Therefore, when trying to pull out the dummy bars in parallel in this way using a common slab guide roll that presses all the dummy bars at the same time, the pressing force on each dummy bar becomes uneven. This causes a difference in the dummy bar supporting force between the dummy bars, or causes disturbance in the synchronized pulling out of each dummy bar.

The present invention has been made in view of the above-mentioned situation, and is characterized by at least a slab guiding device formed into an integral roll with a long body that can simultaneously press a plurality of slabs cast in parallel. When inserting three independent dummy bars from above and pulling them out in parallel, the thickness of the dummy bars on both sides of the three dummy bars should be adjusted to an appropriate range.
The dummy bar row is formed thinner than the thickness of the central dummy bar, and the dummy bar row is pressed at the center and both sides using an appropriate number of roll pairs having pressing and driving functions, which are arranged at appropriate intervals in the slab guide system. The pattern is alternately repeated while being pulled out, thereby ensuring stable support for each dummy bar in a dummy bar row consisting of at least three strips, and making it possible to perform synchronized drawing and stable drawing of the slab. The present invention provides a method for drawing out multiple dummy bars in parallel in continuous casting equipment.

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

Fig. 1 is a configuration explanatory diagram showing the relationship between the slab guide roll arrangement and the dummy bar insertion position in an arcuate continuous casting machine, Fig. 2 is a diagram of the configuration when three dummy bars of the same thickness are pressed by a common roll, FIG. 3 is a diagram showing a state in which the central dummy bar is pressed.

Now, a slab guide device having a pressing roll 1 formed into a long-bodied integral roll capable of simultaneously pressing a plurality of slabs to be cast in parallel, for example, three slabs, is equipped with at least three slabs formed to have the same thickness. Insertion of the rigid independent configuration dummy bars 2, 3 and 4 results in the second
As shown in the figure, the pressure roll 1 equipped with a pressure mechanism such as a hydraulic cylinder is inserted through the support parts 5 and 6 at both ends, and there is a gap between the central dummy bar 3 and the pressure roll 1 due to the deflection of the roll. will occur. Therefore, due to this gap, it becomes difficult to tighten and hold the center dummy bar 3 by the pair of rolls, and if such a situation is accumulated, an extremely dangerous situation may occur in which there is a fear that the dummy bar may fall off. It's possible.

In order to solve such drawbacks, the present inventors have
As a result of various studies, it was discovered that by pressing the dummy bars on both sides and the center at different locations, it was possible to reliably support the dummy bars at different casting center positions.

That is, by forming the thickness of the side dummy bars 2 and 4 to be slightly thinner than the thickness of the center dummy bar 3 over an appropriate range, when the thin-walled area is pressed with the press roll 1, the center dummy bar 3
As shown in FIG. 3, it is possible to press particularly tightly.

In this way, portions where the wall thickness of the side dummy bars 2 and 4 is thinner than that of the center dummy bar 3 are appropriately provided in the longitudinal direction of the dummy bar, and the appropriate portions corresponding to the thin portions and the portions where the three strips have the same thickness. Press rolls 1 are provided at appropriate locations corresponding to the respective locations. By attaching this pressure roll 1, only the center dummy bar 3 is pressed by the pressure roll 1 through the thin parts of the dummy bars 2 and 4 on both sides, and the center dummy bar 3 is pressed at other parts by the other pressure rolls 1. The dummy bars 2 and 4 on both sides having the same thickness as 3 are pressed, and the 3 dummy bars are pulled out at the same time.

In the present invention, the dummy bar is pulled out while sequentially applying the pressure pattern as shown in FIGS. 2 and 3 to the downstream area of the slab guide system as the dummy bar moves. By doing so, the purpose of the present invention could be fully achieved.

Next, details of this pressing pattern will be further described.

First, as shown in FIG. 1, among the dummy bars that are inserted into the mold from above the mold through the tail end and descend within the slab guide roll, the dummy bars 2 and 4 on both sides are connected to hydraulic cylinders 12 and 13. It is held in the manner shown in FIG. 2 by the pressure roll 1 which is pressed by the pressure roll 1, and is pulled out and controlled by the drive rolls 18 and 19.

On the other hand, the thin-walled portions of the dummy bars 2 and 4 on both sides (the range shown in FIG. 1 24) are
As shown in FIG. 3, the central dummy bar 3 is particularly tightly clamped and controlled to be pulled out by drive rolls 20, 21.

Therefore, by controlling the speeds of the drive rolls 18, 19 and 20, 21, the three dummy bars 2,
3 and 4 can be controlled in unison.

Next, due to the downward movement of the dummy bar, the press roll 1, which has become a standby position in advance, enters the operating range as the thin-walled portion 24 of the dummy bar moves, and presses the dummy bar 3 by the urging of the hydraulic cylinder 16. The state shown in FIG. 3 is reached.

On the other hand, in parallel with the above-mentioned state, the roll pair consisting of the hydraulic cylinder 14 and the drive roll 20 is
The dummy bars 2 and 4 at both ends shown in FIG. 2 are clamped. That is, the pattern changes from pressing the central dummy bar 3 at the front stage to pressing the dummy bars 2 and 4 at both ends.

By sequentially repeating and transferring the above-described operations to the pressure/drive roll pair in the downstream region after the hydraulic cylinder 17 and the drive roll 23, three independent dummy bars can be synchronized and controlled to pull out at the same time. .

Note that the pressure roll 1 and the drive roll are connected to a drive device via shafts 8 and 9. Further, both end support portions 5 and 6 of the pressure roll 1 are respectively provided so as to be movable forward and backward by hydraulic cylinders.

By constructing and using the present invention as described above, it is possible not only to stably support the dummy bars but also to enable synchronized extraction of parallel dummy bars, as well as to safely and reliably insert a plurality of dummy bars upward, thereby shortening the time required for inserting the dummy bars. Further, there is an effect that the dummy bar can be inserted in alignment with the casting line without meandering when inserted.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram of the present invention showing the arrangement of rolls of an arc-shaped continuous casting machine and the insertion position of a dummy bar. FIG. 2 is a diagram showing the state when three dummy bars of the same thickness are pressed by a common roll. FIG. 3 is a diagram showing a state in which the central dummy bar is pressed.

Claims (1)

[Scope of Claims] 1. A slab guide device formed by an integral roll with a long body that can simultaneously press multiple slabs to be cast in parallel, with at least three independent dummy bars inserted from above to cast slabs in parallel. When performing drawing, the thickness of the dummy bars on both sides of the three dummy bars is thinner than the thickness of the dummy bar in the center, and an appropriate number of pressurizers are applied to the slab guiding device system at appropriate intervals.・Using a pair of rolls that have a driving function, press only the center dummy bar through the thin parts of the dummy bars on both sides, and use other pairs of rolls that have pressing and driving functions to press both sides with the same thickness as the center dummy bar. A plurality of dummy bars in a continuous casting facility characterized in that the dummy bars are pressed and pulled out while the pressing pattern of the central and side dummy bars is sequentially applied to the downstream area of the slab guide system as the dummy bar row moves. Parallel drawing method.