JPS60152348A - Belt type continuous casting machine - Google Patents

Abstract

PURPOSE:To provide the titled casting machine which suppresses thoroughly bulging of a solidified shell by mounting cooling grids provided with plural skid members for supporting the solidified shell, nozzle tips for spray water, etc. right under a mold device. CONSTITUTION:Cooling grids consisting of skids 22, 22' which are attached to brackets 21 and are used to support the solidified shell of a billet 8 and slide the billet, nozzle tip pairs 23, 24, 25 for spraying cooling water, water chambers 18, supporting frames 19 forming the headers for the spray water and pipes 26 for supplying the cooling water communicating with said frames, etc. are mounted on a base plate 15 between drive pulleys 3, 3' and guide roll pairs 12 right under a mold device of a belt type continuous casting machine. The solidified shell is supported and cooled over a wide surface area by the cooling grids provided in the narrow spaces, by which the bulging of the shell is suppressed and the improvement in the quality of the billet 8 and the prevention of breakout are attained.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an inclined or vertical belt type continuous casting machine (
Hereinafter referred to as belt casters. ) regarding.

[Conventional belt casters]

The outline of the conventional belt caster to which the present invention is applied will be explained first.
This will be explained based on the diagram. In the figure, 1 is a molding device, tension pulleys 2, 2, drive pulleys 3, 3', steering pulley 4° 4', heat-resistant steel bell) 5.5'
It is composed of main components such as a belt cooling device 6 and a secondary cooling device 7. bell) 5.5' is pulley 2,5
゜ 4, 2', 5', 4' are wound endlessly, and the drive pulley 5 is driven by a power drive device (not shown).
．． The belts are arranged in parallel with a gap corresponding to the thickness T of the slab 8 between the opposing surfaces of the belts, and this gap A pair of short side molds 9 are disposed at both ends of the belt width direction, and molten metal (hereinafter referred to as molten metal) 11 supplied from the tundish 10 into the gap part is prevented from leaking to the outside from between the belts. A V-solidified shell is formed by contacting and cooling the belt surface while being prevented from
In the secondary cooling device 7 consisting of the secondary cooling device 7, the metal slab 8 is further cooled and continuously cast, and is led to the next process via pinch rolls (not shown) at the bottom of the secondary cooling device 7. has been done.

Here, as mentioned above, since the slab 8a at the exit portion of the molding device 1 (hatched area in the figure) is led out to the secondary cooling device 7 while the inside of the shell is in an unsolidified state, the static pressure of the molten metal The solidified shell bulges outward (hereinafter this phenomenon is referred to as bulging). For this reason, bulging can be prevented by bringing the upper guide roll 12 of the secondary cooling device 7 as close as possible to the strip pulley 3.5' and minimizing the distance between the two members supporting the slab 8a. ing.

[Disadvantages of the conventional belt casters mentioned above]

However, in the above belt caster, it is necessary to install the slab cooling nozzle 15a between the drive pulley 6.3' and the upper guide roll 6, and the drive pulley 3
, 3' has a large diameter, as shown by diagonal lines,
The interval at which the slab 8a is supported by the pulley 3.3 and the guide roll 12 becomes considerably long. For this reason, the solidified shell of the core slab 8a often bulges, cracks occur on the surface of the slab 8, and the surface quality of the slab 8a is often deteriorated. In some cases, the solidified shell ruptures and the molten metal 10 inside leaks out, a so-called breakout, which is a cause of serious accidents that may lead to suspension of operation.

[Object of the present invention]

An object of the present invention is to provide a belt-type continuous casting machine that eliminates the above-mentioned drawbacks.

[Configuration of the present invention]

And, as a means for achieving the above object, the present invention resides in that a cooling grid is installed directly under the molding device. That is, the present invention provides a belt-type continuous casting machine, in which a cooling grid consisting of a plurality of skid members for supporting a cast piece solidification shell, a spray water nozzle tip, and a support frame forming a spray water header is installed directly below the molding device. This is a belt type continuous casting machine that is characterized by:

Hereinafter, the present invention will be described in detail based on FIGS. 2 to 5, but the same members as those of the conventional belt caster described above will be denoted by the same reference numerals and detailed explanation will be omitted.

2 to 5 relate to one embodiment of the device of the present invention, in which FIG. 2 is a schematic front view including a partial cross section, FIG. Figure 4 is a front view, Figure 5 is B in Figure 3.
-B arrow view.

2 to 5, the drive pulleys 3 and 5' of the molding device 1 and the upper guide roll pair 1 of the secondary cooling device 7 are shown.
Between 2.12' and 12', the cooling grid 14 is removably fixed to the base 15. The cooling grid 14 is
An airtight ice chamber 18° 18 has a short-shaped cavity 16 through which the slab 8 can freely pass through its center, and whose interior is symmetrical through a partition wall 17 provided at the center of the short side. A box-shaped support 7 frame 19 with a square cross section forming a frame 19 and a long side wall 20, 20' in the cavity 16 of the support frame 19 are each provided with a plurality of pairs (in the illustrated example) extending in the traveling direction 2 of the slab 8. In the device, 4 pairs of platens) 21.21't'' are arranged in parallel at equal intervals in the middle of the slabs, and on the opposite end surface of the brackets 21.21' are brackets corresponding to the thickness T of the slab 8. A rectangular bar-shaped skid 22.22' is detachably fixed so that the slab 8 can freely slide through it with a gap t between the rows of skids 22.22'. and a pair of cooling water spray nozzle tips 23° 25', 24.24', 25.25' provided on the outer side walls 20.20' of the skid rows at both ends.
# has been completed. The skids 22, 22' are desirably mounted so that their upper and lower edges are close to the drive pulley pair 5, 6' and the upper guide rolls 12, 12, respectively, so as not to contact them.

Also, each spray nozzle pair 25.23'.

24.24', 25.25' are drive pulleys 3°3
and the upper guide rolls 12, 12 so that the entire surface of the slab 8a can be cooled uniformly.

In addition, 26.26' in the figure is the ice chamber 18.1 of the support frame.
8' is a cooling water supply pipe, 27 is a support frame mounting bolt, and 28 is a reinforcing member for the platen (21 and 21').

Although the Kinei BA has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, and various design changes can be made without departing from the spirit of the present invention.

[Effects of the present invention]

As described in detail above, the present invention includes a cooling grid installed directly below a molding device, and this cooling grid is composed of a skid member, a spray water nozzle tip, and a support frame forming a spray water header. Therefore, the slab leaving the molding device is supported over a large surface area by the skids of the cooling grid and descends to the secondary cooling device while being cooled, so that the bulging of the solidified slab shell in this area is reduced. can be completely suppressed.

Therefore, by using the apparatus of the present invention, the problems with the conventional apparatus (see FIG. 1) can be solved, and the quality of slabs can be improved and breakouts can be prevented. Furthermore,
The support frame constitutes the header for the spray water;
In the narrow space between the molding device and the secondary cooling device, spray nozzles can be easily arranged to enhance the cooling effect of the slab, and each member of the cooling grid can be easily arranged to prevent operational accidents such as breakouts. This has advantages such as protecting against damage, contributing to improved productivity and reduced maintenance costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional belt type continuous casting machine to which the present invention is applied. Figure 2 is a partial sectional view of a belt-type continuous casting machine that is an embodiment of the present invention, and Figure 6 is Figure 2A.
-A line arrow view; FIG. 4 is a front view of FIG. 2;
FIG. 5 is a view taken along the line B--B in FIG. 3. 1...Mold device 2.2...Tension pulley 3.5...Drive pulley 4.4'...Steering pulley 5.5...Belt 6...Belt cooling device 7...Secondary cooling device 8*8as... Slab 9...Short side mold 10...Tundish 11...Bath water 12.12...Guide rolls 15a, 16b-Q cooling nozzle 14...Cooling grid 15...Base 16...Empty @ part 17... Partition wall 18.18...Water chamber 19...Support frame 20.20'...Side wall 21.2
1-〇 Bracket 22.22-・Skid 26.26'・・Cooling water supply pipe 27-・Support frame mounting bolt 28・・Reinforcement member T・・Slab thickness t・・Gap 2・・・Slab advancing direction Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Figure 1

Claims (1)

[Claims] In a belt-type continuous casting machine, a cooling grid consisting of a plurality of skid members for supporting a solidified shell of a cast piece, a spray water nozzle tip, and a support frame forming a spray water header is installed directly below the molding device. Belt type continuous casting machine.