JP3356408B2 - Spray cooling method and spray cooling device in billet continuous casting facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray cooling method for cooling a billet drawn from a mold of a continuous casting machine by a water jet in a billet drawing passage, and a billet continuous casting used for carrying out the method. Machine spray cooling device.

[0002]

2. Description of the Related Art In a continuous caster for billets, a semi-solidified billet which has been primarily cooled in a mold is secondarily cooled in a billet drawing passage immediately below the mold. This secondary cooling is usually spray cooling by water injection, and the cooling water is sprayed from the spray nozzles to the four surfaces of the billet, and gradually becomes solidified billets while passing through the drawing passage. Conventionally, a spray cooling device for billet secondary cooling has a device frame detachably fixed to the lower surface of a mold with four bolts. When the size of a billet to be cast is changed, the entire spray device is removed and adapted to that size. The billet was replaced with a sprayer which was used, thereby ensuring uniform cooling of the billet in the secondary cooling zone.

[0003]

As described above, the conventional spray cooling device of the continuous billet continuous casting machine is a device dedicated to each size of billet, and the mold is once taken off-line every time the billet size changes. Hanging out
Since the spray device must be replaced by removing all four bolts, a great deal of cost and labor is required when the size is changed, which has been a factor of reducing productivity.

According to the present invention, even when the billet size is changed, uniform cooling can be ensured without replacing the spraying device, thereby shortening the billet size change time, saving labor and improving productivity. An object of the present invention is to provide a spray cooling method and a spray cooling device in equipment.

[0005]

METHOD spray cooling in billet continuous casting installation according to the invention, there is provided a means for solving] may enclose the billet
4 spray nozzles on the frame of the spray device to be wrapped
At the same distance from the billet center and around the billet
Fixedly arranged at equal center angular intervals, the billet reference plane the frame of the spray apparatus when changing the billet size
Perpendicular to this and from the billet reference plane
Distance to confronting spray nozzle and billet reference plane
Spray Nose confronting this from the side of the billet parallel to
Are moved by an amount that makes the distance to the object equal .

Further, the spray cooling device of the billet continuous casting equipment according to the present invention is characterized in that four spray nozzles attached to the cooling water supply pipe of the spray device are equidistant with respect to the billet center and at equal angles around the billet. It is arranged at intervals, and the frame of the spray device is
Elongate holes which are connected to the mounting bolts at two points by two pins, and extend through the bolt insertion holes formed in the frame and into which the mounting bolts are inserted, and the pin holes into which the pins are inserted in a direction perpendicular to the billet. It is what it was.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a spray cooling device of a billet continuous casting machine according to an embodiment of the present invention. FIG. 3 is a partial sectional view taken along line AA of FIG. 1, and FIG. 4 is a partial sectional view taken along line BB of FIG. The billet 3 (not shown in FIG. 1) after the primary cooling is guided from the molten steel discharge port 2 on the lower side of the mold to the guide roll 4 and moves in the drawing path in the direction of the arrow, and passes through the curved band of the path. It is taken out from the end of a horizontal delivery path (both not shown). The frame 6 of the spray device 5 is mounted on the lower surface of the mold 1, and is disposed at two places on one side, in this embodiment, the device frame 6 on the outside of the curved passage (on the opposite side of the curved center across the drawing passage). Are connected to the lower surface of the mold through the bolt insertion holes 7a formed in the frame 6 by the mounting bolts 7, and the other two inner portions are connected by the engagement of the pin holes 8 and the pins 9. You. The pin hole 8 is formed in a bracket 10 provided on the lower surface of the mold. As shown in FIGS. 1 and 2, the bolt insertion hole 7a and the pin hole 8 are perpendicular to the billet (inward and outward of the curved passage). It is a long hole that extends. The pin 9 provided on the frame 6 of the spray device 5 is inserted into the pin hole 8,
Therefore, by loosening the outer mounting bolts 7, the spray device 5 can slide in the direction perpendicular to the billet (in the direction of the arrow in FIG. 1) within the range of the elongated hole.

A substantially rectangular annular cooling water supply pipe 11 is attached to the apparatus frame 6, and on the upper and lower sides of the supply pipe,
At the center of each side of the quadrangle, four spray nozzles 12 each for spraying water on each surface of the billet 3 are attached via a branch pipe 15. Here, one spray nozzle 12 is constituted by one nozzle on the upper side of the supply pipe 11 and one nozzle on the lower side. In this configuration, the four spray nozzles 12 are positioned at the same distance from the billet center and at equal center angle (90 °) intervals around the billet. 5 and 6 are plan views showing a relationship between the billet 3 and four spray nozzles 12 around the billet 3, and FIG.
In this case, the billet 3 is changed to a billet 13 having a smaller size than the billet 3. Each of the billets 3 and 13 has a square cross-sectional shape. With respect to the reference line S of the machine, the O side is outside the curved billet passage, and the I side is inside the curved billet passage. One face of the billet always coincides with this reference line S regardless of the billet size.
Here, billet surfaces that match the machine reference line S are referred to as billet reference surfaces 3a and 13a.

In the example shown in FIG. 5, the spray nozzles 12 on the cooling water supply pipe 11 face each other and face two parallel surfaces of the billet 3, respectively. The pair of opposed spray nozzles 12 are on the center line H of the billet reference surface 3a that matches the reference line S,
The other pair of spray nozzles 12 is connected to the billet reference surface 3.
It is located on the center line C of the other billet surface 3b which is in a right angle relationship with a, and the distance d between each of the four billet surfaces and the spray nozzle 12 opposed thereto is all equal. In the case of FIG. 5, the center C of the billet coincides with the center of the mold frame.

A billet of a certain size, for example, FIG.
When the billet size is changed after casting of a billet 3 having a square cross section of 150 mm square shown in FIG. 1, for example, when changing the size to a billet 13 having a square cross section of 135 mm square shown in FIG. The frame 6 of the spray device 5 is molded from the inner side I to the outer side O of the curved passage of the billet 13 without loosening and removing the mounting bolt 7 and the pin 9 from the bolt insertion hole 7a and the pin hole 8 both formed by long holes. It is slid with respect to the center of the frame C by the adjustment amount ε so that the distance between the billet reference surface 13a and the opposite billet surface parallel to the billet reference surface 13a and the spray nozzle 12 facing these surfaces is equal on both sides.
The center H of the billet reference plane 13a (the center of the billet in a direction perpendicular to the billet discharge direction) is the same as before the size change, and the billet 13 has a square cross section, and the cooling water supply pipe 11 has a rectangular shape. Since the tip of each nozzle 12 provided on each side of the ring extends at the same length from each side of the supply pipe, the two billet surfaces 13 perpendicular to the billet reference surface 13a are provided.
The distance between b and the spray nozzles 12 facing each other is the same, and after all, only by sliding the spray device 5 by the adjustment amount ε, the distance between each of the four faces of the billet and the spray nozzles 12 facing the same after resizing. f are all equal.

When the size of the billet is changed to a size larger than the billet 3 shown in FIG. 5, the spray device frame is slid in the opposite direction, that is, from the outside of the billet curved passage to the inside to reduce the distance between the spray nozzle and the billet surface. Equal on both sides. In the above-described embodiment, pins are provided on the frame of the spray device, and the pin holes are formed on the bracket on the lower surface of the mold. However, the pin holes are formed on the frame in reverse order, and pins are provided on the lower surface of the mold. It goes without saying that it is possible to do so. Further, in the above-described embodiment, the cooling water supply pipe 11 has a rectangular ring shape, but the present invention is not limited to such a form, and an annular supply pipe surrounding the billet or an octagonal ring is used. A supply pipe may be used, and each spray nozzle is held in a suitable one machine frame, and cooling water is pressure-fed to each spray nozzle via a pipe from a cooling water supply header installed at an appropriate place in the vicinity. Is also good. Such an embodiment is also included in the scope of the present invention.

[0012]

As described above, the distance between each of the four surfaces of the billet and the spray nozzle is set to be equal irrespective of the billet size, so that the same amount of cooling water is distributed to each nozzle from the same cooling water supply pipe. The billet is sprayed at a constant flow rate onto each side of the billet, resulting in uniform cooling. When the spray device is slid, it is only necessary to loosen the two mounting bolts. There is no need to remove the four bolts and replace it with another spray device as in the past, so there is no need to pull the mold off-line. As a result, the work time when changing the billet size is greatly reduced, the labor required for this is also reduced, and productivity in multi-size casting is greatly improved.

[Brief description of the drawings]

FIG. 1 is a front view of a spray cooling device of a billet continuous casting machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line CC of FIG. 1;

FIG. 3 is a partial cross-sectional view along the line AA of FIG. 1;

FIG. 4 is a partial cross-sectional view along the line BB of FIG. 1;

FIG. 5 is a plan view showing a relationship between a billet and four spray nozzles according to the present invention.

6 is a plan view showing a relationship between the billet and four spray nozzles when the billet is changed to a billet having a smaller size than the billet of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 3,13 billet 5 Spray device 6 Spray device frame 7 Mounting bolt 7a Bolt insertion hole 8 Pin hole 9 Pin 11 Cooling water supply pipe 12 Spray nozzle

Continuation of the front page (56) References JP-A-56-56768 (JP, A) JP-A-58-159952 (JP, A) JP-A-54-116330 (JP, A) JP-A-9-103857 (JP) JP-A-5-285615 (JP, A) JP-A-8-267205 (JP, A) JP-A-6-77959 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B22D 11/124 B05B 15/08

Claims (2)

(57) [Claims] 1. A frame of a spray device for surrounding a billet.
4 spray nozzles equidistant from billet center
Separated and fixed at equal angular intervals around billet
And, wherein the spray device when changing the billet size
The frame in a direction perpendicular to the billet reference plane, and
From the billet reference surface to the spray nozzle facing it
Distance from the billet side parallel to the billet reference plane
The distance to the spray nozzle facing this becomes equal
A spray cooling method in a billet continuous casting facility, which is moved by an amount . 2. Four spray nozzles attached to a cooling water supply pipe of a spray device are arranged at an equal distance from a billet center and at equal angular intervals around the billet, and a frame of the spray device is provided on a lower surface of a mold. Are connected to two mounting bolts and two pins, and a bolt insertion hole formed in the frame and into which the mounting bolt is inserted and a pin hole into which the pin is inserted extend in a direction perpendicular to the billet. A spray cooling device in a billet continuous casting facility having a long hole.