JPS5945063A - Continuous casting machine for sheet metal - Google Patents

Abstract

PURPOSE:To provide a titled casting machine which yields a product having good quality without central segregation, etc. by the constitution wherein a molten metal well is formed with a pair of side walls on the top surface of an endless belt having a downward projecting shape, the molten metal is cooled from the bottom surface and a solidified shell is formed from the center of the molten metal well and is drawn. CONSTITUTION:A molten metal well part 25 which is enclosed with the side walls 22, 22' having the bottom end faces conforming tightly the traveling surface 21 having a downward projecting shape of a traveling endless belt 18 traveling on a pulley 18' on both sides of said surface 21 and provided with linings 24, 24' of refractories on the inside lateral surfaces and receives the molten metal 4 from a tundish is formed. A cooling plate 30 having many nozzle openings 31 which open toward the bottom surface of the belt 18 is disposed to eject pressurized cooling water and to cool the belt 18'. An inert gas is bubbled from inert gas releasing devices 26, 26' and the solidification on the surfaces of the walls 22, 22' is prevented by heaters 28, 28'. The solidified shell 32 formed in the central bottom part in the well 25 is drawn with pinch rolls 20, 20, whereby a sheet metal 23 is continuously cast.

Description

[Detailed description of the invention]

The present invention relates to a continuous cutting machine for thin metal sheets. As is well known, the continuous casting method is vastly superior to the ingot-forming method in terms of energy efficiency and yield, so it has come to dominate the production of crude steel. Recently, this continuous casting method has been used to directly produce metal TJ plates.
Research is underway on technology that will 1. C, that is, if the thickness of the slab by continuous casting is lowered, the rolling reduction ratio in the rolling process (y) will be reduced by that amount, which is advantageous from the point of view of energy saving.However, in general As long as a vertical or curved continuous casting machine is used, the thickness of the slab cannot be reduced below a certain t-good. This is because in conventional rensa ψ-J iso-making, a submerged nozzle is inserted into the mold, and the molten metal from the tundish is supplied into the mold by the immersion nozzle.
This is a system in which molten metal is cooled from the outer periphery 111 of the mold to form a solidified shell on the outer periphery side.If the opening diameter of the immersion nozzle is too small, there is a risk of clogging the nozzle, and at the same time, the nozzle Since the wall thickness of the refractory that forms the refractory cannot be sacrificed in terms of degree of hardness and durability, in the end the immersion nozzle is required to have a certain width, and therefore Japanese molds are borrowed. Between the copper plates 1 (because yA cannot be made too narrow, F1's) Saha・Il! Constant 1 (, I Q m,
7H is lX14 SL and it is difficult to make it less than that, especially -\' 20~80 +11m 4! ii
1. ) It was actually impossible to do so. Therefore, "'e""+1<", ljJ was once proposed for the horizontal series of single-sided solidification method as shown in Fig. 21λ1. In the mold 2 in which Hg 1. VII Inject gold l, be 4 (
7) I+1-. 91 (Ka (:)) The solidified shell 5 produced by cooling is continuously pulled out from the open side of the mold 2 to obtain the slab 6. In this way.

[, Molten gold 1 (14 supply methods and ', (I
Although the shape of the mold 2 does not particularly limit the size of the cast slab 6, the melt 1i; i! Since the metal 4 is solidified from the bottom side and the resulting solidified shell 5 is pulled out, powder is supplied between the mold 2 and the solidified shell 5 to uniformly spread the f1 layer between them. It is almost impossible to introduce a general method for continuous casting that can be carried out satisfactorily, and as a result, problems such as seizure, the resulting rupture of the solidified shell 5, and even breakout remain. For this reason, horizontal connections for thin plate rJ and j construction have not yet been put into practical use. On the other hand, the solution to the mold of the tanuki hard shell is 1.
In order to prevent the shell from breaking, etc., in conventional continuous casting machines, oscillation is performed by mainly moving the mold up and down, but this eliminates the need for oscillation and increases the casting speed. As a possible continuous casting machine, a rotary set continuous casting mill of the type shown in Fig. 2132 (al l (b)) has recently been proposed. A metal belt 9 is caused to travel in synchronization with the rotation of the bamboo wheel 8 in a position that covers the concave γ1" pad 7 over a certain distance along the outer circumference of the casting wheel 8 which is rotationally driven.
A casting space IO is formed in this N by the groove 7 and the metal belt 9, and the molten metal M 12 of the tongue dish 11 is poured into the casting space 10. Fee, front +3129'J
By water cooling the residue 1'il 8 and or the metal belt 9, if: ftQ construction? The molten gold 12 in the IO between 1 and 1 is cooled, and the resulting solidified shell] 3 is pulled out from the bottom of the casting wheel 8 in the water direction by a vinyl roll 14, A slab 15 is also obtained. Is this how you perform high-speed casting? ? ) even if the bolt is
The casting beam gap 10 formed by IIf 7 and gold Hubbert 9 is functionally similar to that in the general hand-shaped or 1-curved series H, Tas 1 construction + geometry, and is not suitable for bloom or billet. Although it is suitable for continuous casting of rectangular slabs like this, it is not possible to obtain thin slabs. In addition, in the rotary set continuous fishing machine, since the solidified shell 18 is generated on the outer circumferential side in contact with the H all wheels 8 and the belt 9, there is a non-71% solid portion 509 inside the solidified shell 13, and therefore the vinyl roll is removed from the casting space 10. If the solidified shell 13 is not spray-cooled during the period up to 14, the solidified shell 13 will not harden, resulting in a corresponding decrease in thermal efficiency, and unavoidable center segregation and non-metallic inclusions. However, the 31st-4th h) + (lI) I/(-(
F'l As shown, the rotary one type in Fig. 2 has been improved.
The continuous four ends (ports are also proposed, this 1", ・) are attached to the horizontal shaft 1 through c to two rotating disks, 1. (+
a, I 6 +) 'i:+su ``Identified between the legs IX1°h/, pJ construction ll1n], o, and the same in contact with its outer periphery'' 1 run I j-3 gold (・4 belt]
8, and both rotating plates 1, fl a, ,
There is a water reservoir part 1 between L 41 b and gold A゛) belt 18.
7741 of Tanditsh 11 is formed in this N.
．． v'll metal 12 'J7. +'i' Feed from 17, above <+'-, M bell) l-i of 18? ii to generate a solidified shell, and then pinch roll 2 under Seishu ()
Pull it out. A diagram is shown below. This type of improved rotary set 17 continuous machines are 2 + 'days ≧ 1 in original JJL terms.
Compared to the competition, the starvation of the meat is more advantageous! J is done. However, 7A on the side of the hot water MI area 19 prevents lfi hardening.
A heat insulating layer is placed on the casting wheel 16 in order to Nori 1%
lI! ] Shell formation is avoided, and furthermore, as the casting wheel 16 rotates, the molten metal 1・(,))”= 1j17
The IIIQ point was 1' while the p% layer was dragged by the 1fld and cracked, which fell onto the 5 pieces and deteriorated the surface quality. This invention is based on the technology of double-coupled cross-boards (71 mota-na-sand) which can eliminate the small [avoidable NfJ drawbacks on parf-fi] with eleven advantages. The purpose of this invention is to propose a continuous i14 structure lithium of λ...'1;
The endless belt passed through the belt and the downwardly convex running surface of the end belt 111. Inside facing each other (i! 11 side is surrounded by a pair of side walls made of a refractory lining with excellent heat resistance), there is a hot water pool part in which the raw material melt is received. Prepare for this hot water.
, the running surface of the metal belt is separated from the t + edge part, and the gold (
・Multiple nozzles 110 opening toward the bottom surface of Hebert
In addition to arranging a cooling plate 6 having an inert gas discharge device l'rj on the inner surface of the upper N+2 lining, and a heating device 1 for heating the lining. The solution to the above six problems is to provide the following. Figure 4 (a) * (b) shows the preferred embodiment of this invention/r
Here is an fli example. In the figure, 4.3 and 1B are 1 + gold 1 per 1/l.
・ぢThe belt is long, l, r, 11. r...+F5
With the belt, the number of pulleys is 18'. Roll between j
-1 I'n I is driven in the direction shown by the arrow and runnable so as to form a downwardly convex running surface 21 between the pair of pulleys. This ll1 action and 2l both 111 are the traveling ll! l
The 111th side facing the Buddha is made of fireproof material with excellent heat resistance.
1; Although not shown, a pair of side walls 22 and 22' made of
I'm trying to make one metal 1j7f, Saka 23's board l1lIC
After 1 M f! (', i is +'J' rihi and'Cter・1 is set. 1:〈24.24' in l is the inner lining, and these side o +
:):22. More precisely than 22', the inner lining 24. , 24' and nothing "1
The bottom of the 711 reservoir 25 is a fill wall 22 + 1; 2 by applying tension to the endless bell 18.
'Fly' with the endless belt 18 with close contact with the lower surface pressure
I,'il, Therefore, the leakage of the hot water W1' (the rim part 25 occurs).Top + fl: The hot water W1'? The refractory linings 24 and 2ν, which have excellent properties, are equipped with a discharge device fi' (2 fl.
゜2〔j′ is 241, 24, ′ is porous 1
It is preferable to provide an insect channel 27, 27' to form an inert gas, and by supplying an inert gas to the channel 27, 27', a discharge device 2 (+, 2 fi' to the sump) is formed. 2
Inert gas bubbles are blown into the molten metal in the inner lining 24. In addition, on the back of the inner follower 24, 24', there is a heat generating device 2R,
Install 2R'> Y and add the inner linings 24, 24' from the back ~: ~ then 'Jt) A, and in conjunction with blowing out the inert gas bubbles (4 from the inner surface of the li11 walls 22, 22'
・1 "1; Gold quantity (effectively defends against hardness. Furthermore, 2!
+, 29' indicates adiabatic failure. A tamp ish 3 is provided above the Moraron hot water pool 25 to carry out the molten metal 4 corporation.
On the top surface of the opposite end 111 (that is, the endless bell) 18 that sandwiches the belt] 8 and the tandish, there is the water reservoir 2.
A cooling plate 30 is provided extending along the bottom shape of 5. This cooling plate 3o is provided with a large number of nozzle openings 31 facing the bottom surface of the endless belt 18, and cold water is spouted through the nozzle openings 31 to cool the bottom surface of the endless belt 18. By spouting water, the hot water sink: (ribe-2
The molten metal in the molten metal 5 is cooled from the belt contact surface side to generate a solidified shell 32, and at the same time, the jet pressure of cooling water is used to counteract the static pressure of the molten metal. The endless belt 18 has a running surface 21 that acts as a cooling medium that cools the molten metal in the pool 25 and promotes the formation of the solidified shell 32.
is updated sequentially, so preferably 2 to 3
It is preferable to use a heat-resistant gold pA band with a temperature of about 100 nm in order to effectively transmit the cooling capacity of the cooling plate 3o. In addition, when casting a wide thin metal plate as described above, the method shown in Fig. 5 is an effective means of overcoming the problem that the endless belt bends into a hollow in the cross section shown in Fig. 4 (b). It is preferable to use a reinforced endless belt 33 as shown. In other words, a large number of protrusions 34 extending across the width are provided on the winding surface at equal intervals to increase the bending rigidity in the width direction and prevent bending, and the running surface 21' is melted during steady construction. Due to the static pressure of the metal,
Paper in Figure 5 + Ti? 11. The degree of pinching is reduced. Therefore, 17+b;LjlIi lower surface of belt 33 and E cooling l! Always keep the distance between Hy 3o and the desired dimension (e.g. C), 2~o, a mm 't'
r R”-), and at the same time each protrusion 34
The recesses between each other allow the cooling water to be distributed in the width direction of the belt 330. If such an endless belt 33 reinforced with line discharge is adopted, even if the width is considerably wide, a uniform film of cooling water can be run. It is possible to generate the cooling directly under the surface 21', and as a result, it is possible to advantageously prevent the occurrence of uneven cooling in the width direction.1. The lining 24..2', which has excellent heat resistance and is disposed on the inner surface of the hot water M (recess 25), is MgC-based, SiC'-based, and Hg2
08 series refractories, especially those with high spalling resistance, are used. The purpose of this is that the inner (i111 layer 1 has j,;
- Even if the object is intended for a long life and has a relatively high t・~den・JJ property, there is Shu on the 1Y side.
, i, +1. Installation of 8,2 ft' of 1st floor: td and inert gas discharge device: <
6126', it is possible to prevent the formation of the solidified shell 32 in both e and l:; in the IV and S directions before the formation of the solidified shell 32.
IIT end belt 18, 38 Kte/911! The purpose is to make the surface 1514. Moreover, this point has already been mentioned above; even if the tie ring 16 as shown in 1.3 and 1 is rotated together with the 8-end belt 18, even if the fireproof l 6
Even if the inner part of d is hjq l-, is it the pair 1 due to its rotation? 't l,j''! Compared to the case where the 4 contact surfaces are cooled in a sequential manner, since the side wall is a fixed type, it can be maintained at a predetermined temperature for 6 days a day. 1. To be rejected! Since there is no "mi", both ν1j, 1
of? The orientation is t! from the center ZF plane. Even more θ for the purpose of ``Berase''! Conveniently, 28 and 28' are filtration devices made of a ceramic heating element with a degree of x4r8ArQ of about 17+J O"C, which allows the internal 1
(Furi 241, 24./side) A device that keeps the fire material C+'+i within a predetermined temperature range by keeping it in a predetermined temperature range, and is covered with a heat insulating material 2!+, 2i1'. Gara t,
ζ transition can be realized without an interval M+1. Furthermore, the gas emitting device 2 II 42 ++' is limited to local use, and is located below 25 so that it blows out from the entire surface. 1.
No Ω; M belt [GJ”L for 8°33
＞41 As shown in (fl), a cooling device 35 and a drying device t''j Yes. 3 in the diagram
7 is the solidified shell 32 with an endless bell) 18.88 Karari 1j
The knife 38 for stripping and guiding the metal sheet 23 to the vinyl roll 2 ( ) is an endless belt tensioning device. When the thin 4L' according to the above-mentioned 17th invention is used in a series, the inner surface is Klr? ! ``b t・A water reservoir is formed between both sides of the walls and the endless belt, and pressurized water is injected onto the lower surface of the running surface, which is convex in the F direction by limiting the bottom of the water reservoir. Since this is a rented building with a cooling HQ: g 30 installed, the molten metal that has been supplied with hot water of 1 (1 mm) is first cooled from the center of the bottom side to form a solidified shell.
: In order to prevent the entrainment of melting r, 1p, and gold p4 on both sides thereof, it is advantageous to draw 717 points to ρ′1 member qξ degree. 'I can adjust. Therefore, according to this departure U[], the town is very large and the money is 1: +4. Continuous f'4 construction of thin plates can be carried out, and since the solidified shell itself is pulled out as a fishing piece, there is no residual material inside the 211 piece. j+11.mu. does not remain. In this case, there is no need to spray cool the slab after drawing out the thin die piece with only the solidified shell, which is disadvantageous in terms of thermal efficiency. Analysis - (C) Good quality gold without non-metallic inclusions (i) is analyzed. #+', 4 h'21 (a) Pulley 18' as shown in (b). Between 18'IV;j /I, fi, (111J-
1,? Radius of curvature of the bottom &'l r 47W, "I":
1 mibelt J'? Mi 2, 6 m, m, belt (1
ζ'41m heat generating 4p lid' ((ceramic heating element)
800 kw, blowing JJ Suwa 50 NeAnln
(-J" /l/l/bon R1'Lfit' nip
Depending on the origin, the thickness is 8 (,1 mm or less).
J7. Pfl plates could be stably produced at a casting speed of 6 Vmin without any trouble.

[Brief explanation of the drawing]

Is j+'+ 11 missing + a traditional gold shrine? l? A cross-sectional view showing a temporary continuous casting machine, No. 2 (a) and (b) are conventional rotary set S
A cross-sectional view without showing the G-concave drill, and a partial cross-section taken along the IIT-m line [vA, FB Figure 3 N r (b) is a quick succession of a thin metal plate! 'i built IQ ('), it too! A cross-sectional view showing an example and a top view of the upper part of the TV-IV section [1'; 4th Th9. I (a) and (b) are jI of 5K)・11 thin plate according to this invention!艷イ・＾I P'J,j
A cross-sectional view showing an embodiment of j'j and a partial cross-sectional view on the line V-V, 5th [''?l is an open cross-section 1 of the section showing another embodiment:
6・3...Tamp/f tush, 4...M financing Aη1, ts, as...Endless belt, 18'...
Pulley, 22.22'...fll (wall, 23...
Metal thin plate, 24.241'...Inner lining, 25...4 hot water tank portion, 2fl, 26'...Inert gas release device, 28.28'...Heating device, 30... Cooling board. Figure 1 Figure 21 1 4 (1)) Figure 3 (a) ~ 1 (b)

Claims (1)

[Claims] J, an endless belt that is wound between the pulleys of the number of tracks, and the running surface of this endless belt has a downward convex shape on both sides to closely improve the running performance.
: A pair of 0ffllll whose end faces are open and at least the inner faces facing each other are lined with a refractory material with excellent heat resistance.
It is surrounded by a wall and has a 1mm (a water reservoir that receives the injection of molten metal). facing the bottom (4
1Thi' is a cooling plate having a large number of nozzle openings L1.
, If'i and the non-gamma tongue 1'1. 5. Gas release device and heating the lining.
・Good, ``1~ruζr', tt are arranged/, ``rukin 1
r i'j + continuous εijl arch of the i-time plate; tH<dark.