CN101048247A

CN101048247A - Molten metal feed nozzle

Info

Publication number: CN101048247A
Application number: CNA2005800369250A
Authority: CN
Inventors: 大塚裕之; 木间塚明彦; 长田史郎; 吉泽广喜; 深濑久彦; R·马哈柏特亚; P·伍德贝里
Original assignee: IHI Corp
Current assignee: Nucor Corp
Priority date: 2004-10-27
Filing date: 2005-10-20
Publication date: 2007-10-03
Anticipated expiration: 2025-10-20
Also published as: AU2005298039B2; EP1818120B1; WO2006046459A1; US20090126895A1; CN101048247B; AU2005298039A1; KR20070068440A; JP4720145B2; JP2006122933A; DE602005027603D1; EP1818120A1; KR100947756B1; EP1818120A4

Abstract

A nozzle end is provided with an extension 11 which has a lower portion immersed in a molten metal pool and extends toward a side weir 2 such that a stagnation area disappears on a free liquid surface of molten metal. The extension 11 is in the form of a quadrangular pyramid lying sidelong and is converged to a point P1 extremely close to the side weir 2. According to this molten metal feed nozzle, a stagnation area on a free liquid surface of molten metal is displaced by the extension 11 contiguous with the nozzle end to suppress generation of an unwanted solidification shell. Thus, no unwanted solidification shell is pinched as foreign matter by solidification' shells generated on outer peripheries of chilled rolls 1 for production of a strip, and break of a strip derived from enlargement of nip between the rolls can be averted.

Description

Molten metal feed nozzle

Technical field

The present invention relates to the molten metal feed nozzle in a kind of twin-roll caster of packing into.

Background technology

Fig. 1 is the figure of an example of expression twin-roll caster, has a pair of chill roll 1 of horizontal configuration and attaches a pair of side weir 2 on this chill roll 1.

Chill roll 1 constitutes, and cooling water is flow through in portion within it, can come according to the thickness of slab of the band 3 that will produce roll gap G is carried out scalable adjustment.

In addition, the direction of rotation and the speed of chill roll 1 are set at, and outer peripheral face separately moves towards roll gap G with the phase uniform velocity from upside.

A side weir 2 is urged and contacts with an end face of each chill roll 1, another side weir 2 is urged and contacts with the other end of each chill roll 1, in all around by the space of side weir 2 and chill roll 1 encirclement, will be that the molten metal feed nozzle of material is configured to be positioned at directly over the roll gap G with the refractory body.

Molten metal feed nozzle is in order to hold the elongated nozzle slot 5 of receiving liquation 4 and having open-top, near the part lower end of longitudinally sidewall, be equipped with a plurality of openings 6 in the mode of arranging along the axis of chill roll 1, this opening 6 connects towards chill roll 1 outer peripheral face from nozzle slot 5, if in nozzle slot 5, flow into liquation 4, then above roll gap G, form the liquation that joins with chill roll 1 outer peripheral face and retain portion 7.

That is, make chill roll 1 cooling as if the circulation by cooling water on one side, retain portion 7 and make chill roll 1 rotation Yi Bian form above-mentioned liquation, then liquation 4 solidifies on chill roll 1 outer peripheral face, and sends band 3 downwards from roll gap G.

In addition, because the wearing and tearing of chill roll 1 slipper of side weir 2 develop pro rata with the running cumulative time, thus need strengthen the pushing force of 2 pairs of chill rolls 1 of side weir gradually, so that liquation 4 can not leak between these parts.

In the molten metal feed nozzle in the twin-roll caster of packing into, 2 nozzles that contact of nozzle-end and side weir (for example, with reference to patent documentation 1) and nozzle-end are arranged from the spaced apart and relative abreast nozzle (for example, with reference to patent documentation 2) of side weir 2.

Patent documentation 1: the spy opens clear 62-45456 communique

Patent documentation 2: the spy opens flat 6-114505 communique

But, under the situation that adopts the such structure of patent documentation 1, because the longitudinally size constancy of molten metal feed nozzle, so if the wearing and tearing of chill roll 1 slipper of side weir 2 development, then only depend on to strengthen the pushing force of side weir 2, can not suppress the leakage of liquation 4 with respect to chill roll 1.

In addition, under the situation that adopts the such structure of patent documentation 2, as shown in figure 10, present following tendency, promptly, with compare between melt nozzle longitudinally side wall surface 8 and the chill roll 1, retain between portion's face 9 and the melt nozzle end wall 10 at parallel relative side weir liquation, velocity flow profile on liquation 4 free surfaces is low, particularly have the liquation 4 scope A of stagnation easily from melt nozzle end wall 10 towards a P0, described some P0 is that the roll gap centre line L retains the point that portion's face 9 intersects with respect to the side weir liquation.

In the scope A of this stagnation, the phenomenon that the temperature of discovery liquation 4 descends because of radiant heat transfer can generate undesirable solidified shell on liquation 4 free surfaces or melt nozzle end wall 10.

And then, if along with the solidified shell that generates on its outer peripheral face that is rotated in of each chill roll 1 sandwiches aforementioned undesirable solidified shell as foreign matter, then produce the shape defect of band 3 local thickenings sometimes, or roll gap G by sandwiching of band 3 position of foreign matter push open, and cause band 3 to rupture because of the reduction of cooling effectiveness with from the recuperation of heat (Complex is ripe) that liquation 4 carries out.

Summary of the invention

The present invention makes in view of above-mentioned actual conditions, and purpose is to provide a kind of molten metal feed nozzle that can avoid the fracture of band.

To achieve these goals, the present invention is a kind of molten metal feed nozzle, is positioned at the top of the roll gap of twin-roll caster, and the end is spaced apart from side weir, wherein, is provided with extension body, this extension body links to each other with nozzle-end, and outstanding so that the scope disappearance of liquation free surface stagnation towards side weir.

In the present invention, utilize extension body and the stagnation scope of liquation free surface is disappeared, prevent the reduction of the melt temperature that causes by radiant heat transfer, suppress the generation of unwanted solidified shell.

According to molten metal feed nozzle of the present invention, can play following such excellent results.

(1) utilize extension body to prevent that near the melt temperature the side weir from reducing, suppress the generation of the solidified shell on the liquation free surface, can not sandwich undesirable solidified shell so on the outer peripheral face of chill roll, generate and form the solidified shell of band, can avoid the fracture of the band that the expansion because of roll gap causes as foreign matter.

(2) be made as towards the side weir convergence as if shape, and the volume of this extension body is reduced gradually, then tail off to the heat transmission that extension body carries out, can prevent effectively that near the temperature of the liquation of side weir from reducing from liquation with extension body.

Description of drawings

Fig. 1 is the concept map of an example of expression twin-roll caster.

Fig. 2 is near the concept map of the velocity flow profile of the liquation Free Surface presentation graphs 1 molten metal feed nozzle.

Fig. 3 is the partial perspective view of the state of expression the 1st embodiment that looks up molten metal feed nozzle of the present invention from the below.

Fig. 4 is the state of Fig. 3 molten metal feed nozzle is observed in expression along the chill roll axis direction a concept map.

Fig. 5 is the state of Fig. 3 molten metal feed nozzle is observed in expression along the chill roll tangential direction a concept map.

Fig. 6 is near the concept map of the velocity flow profile of the liquation Free Surface presentation graphs 3 molten metal feed nozzles.

Fig. 7 is the partial perspective view of the state of expression the 2nd embodiment that looks up molten metal feed nozzle of the present invention from the below.

Fig. 8 is the state of Fig. 7 molten metal feed nozzle is observed in expression along the chill roll axis direction a concept map.

Fig. 9 is the partial perspective view of the state of expression the 3rd embodiment that looks up molten metal feed nozzle of the present invention from the below.

Figure 10 is the state of Fig. 9 molten metal feed nozzle is observed in expression along the chill roll axis direction a concept map.

Description of reference numerals

2 side weirs (baffle plate)

7 liquations retain portion

11,12,13 extension bodies

The A scope

The G roll gap

The P1 point

The specific embodiment

Below, based on accompanying drawing embodiments of the present invention are described.

Fig. 3 to Fig. 6 is the figure of the 1st embodiment of expression molten metal feed nozzle of the present invention, and the part of mark and Fig. 1 and Fig. 2 same reference numerals is represented same parts among the figure.

Be provided with extension body 11 at nozzle-end, these extension body 11 lower portion immerse liquation and retain portion 7, and outstanding towards side weir 2, so that the stagnation scope A (with reference to Fig. 2) of liquation 4 free surfaces disappears.

Extension body 11 is rectangular pyramid such shape of falling, towards the extremely near some P1 convergence of distance side weir 2.

In the twin-roll caster of this molten metal feed nozzle of having packed into, owing to the stagnation scope A with liquation 4 free surfaces is replaced as the generation that the extension body 11 that links to each other with nozzle-end has suppressed undesirable solidified shell, so the solidified shell that generates and form band 3 at the outer peripheral face of chill roll 1 can not sandwich the undesirable solidified shell as foreign matter, can avoid the fracture of the band 3 that the expansion because of roll gap G causes.

In addition,,, can prevent effectively that near liquation 4 temperature the side weir 2 from reducing, can on this side weir 2, not generate unwanted solidified shell so tail off from the heat transmission of liquation 4 to extension body 11 because the volume of extension body 11 is reduced gradually towards side weir 2 sides.

Fig. 7 and Fig. 8 are the figure of the 2nd embodiment of expression molten metal feed nozzle of the present invention, and mark is represented same parts with the part of Fig. 3 to Fig. 6 same reference numerals among the figure.

Be provided with extension body 12 at nozzle-end, these extension body 12 lower portion immerse liquation and retain portion 7, and outstanding towards side weir 2, so that the stagnation scope A (with reference to Fig. 2) of liquation 4 free surfaces disappears.

Extension body 12 is wedge-like, towards the line segment convergence of the level that will link apart from the extremely near some P2-P3 of side weir 2.

In the twin-roll caster of this molten metal feed nozzle of having packed into, owing to the stagnation scope A with liquation 4 free surfaces is replaced into the generation that the extension body 12 that links to each other with nozzle-end suppresses undesirable solidified shell, can not sandwich undesirable solidified shell so on the outer peripheral face of chill roll 1, generate and form the solidified shell of band 3, can avoid the fracture of the band 3 that the expansion because of roll gap G causes as foreign matter.

In addition, because the volume of extension body 12 is reduced gradually towards side weir 2 sides, so tail off from the heat transmission of liquation 4 (with reference to Fig. 6) to extension body 12, can prevent effectively that near the temperature of side weir 2 liquations 4 from reducing, can on this side weir 2, not generate unwanted solidified shell.

Fig. 9 and Figure 10 are the figure of the 3rd embodiment of expression molten metal feed nozzle of the present invention, and mark is represented same parts with the part of Fig. 3 to Fig. 7 same reference numerals among the figure.

Be provided with extension body 13 at nozzle-end, these extension body 13 lower portion immerse liquation and retain portion 7, and outstanding towards side weir 2, so that the stagnation scope A (with reference to Fig. 2) of liquation 4 free surfaces disappears.

Extension body 13 is the quadrangular that end is thin such shape of falling, towards the vertical plane convergence that will link apart from the extremely near some P2-P3-P4-P5 of side weir 2.

In the twin-roll caster of this molten metal feed nozzle of having packed into, owing to the stagnation scope A with liquation 4 free surfaces is replaced into the generation that the extension body 13 that links to each other with nozzle-end suppresses undesirable solidified shell, so the solidified shell that generates and form band 3 at the outer peripheral face of chill roll 1 can not sandwich the undesirable solidified shell as foreign matter, can avoid the fracture of the band 3 that the expansion because of roll gap G causes.

More than previously described the 1st embodiment and the 2nd embodiment from liquation 4 (with reference to Fig. 6) to the heat transmission of extension body 13, but aspect the processing when molten metal feed nozzle is made, the 3rd embodiment is easier.

In addition, molten metal feed nozzle of the present invention is not limited to the above embodiments, can apply change certainly in the scope that does not break away from aim of the present invention.

Utilizability on the industry

Liquation supply nozzle of the present invention can be used for the system of the various metal bands take steel as representative Make.

Claims

1. molten metal feed nozzle be positioned at the top of the roll gap of twin-roll caster, and the end is spaced apart from side weir, it is characterized in that, be provided with extension body, this extension body links to each other with nozzle-end, and outstanding towards side weir, so that the stagnation scope of liquation free surface disappears.

2. molten metal feed nozzle as claimed in claim 1 is characterized in that, the shape orientation side weir convergence of extension body.

3. molten metal feed nozzle as claimed in claim 1 is characterized in that, the shape orientation of extension body is apart from extremely near some convergence of side weir.