CN86108077A - inclined continuous casting machine - Google Patents

Abstract

A kind of inclined continuous casting machine, comprise mold [1], secondary cooling system [2], drawing device [3] that is placed in the inclination on the leptoprosopy and the device [5] that is used for strand [4] is cut into scale, all above-listed equipment are sequentially arranged on the production line along strand shaping direction.

Description

The present invention relates to the direct casting of metal, especially relate to inclined continuous casting machine, and can be used for casting in black and the non-ferrous metal metallurgy and be mainly rectangle or approximate rectangular (plate) base and type (for example beam) base.

What be widely used in ferrous metal smelting is vertical casting machine, its prototype is pouring device (the Schwarz Meyer B: " continuous casting " that is called " casting of metals water-cooled false bottom tube " of M Dai Laien (M.Dalen), be translated from German, Moscow metallurgical industry publishing house, 1962, the 71-72 page or leaf (Schwartzmeyer B. " Continuous casting; " Trsltd from German, Moscow, Metallurg-zdat, 1962, PP.71-72)), by removable Bessemer ladle, vertical mold, the uniform secondary air cooling system of strand cavity temperature, the cutter that is used for the power drive withdrawing roll that strand is pulled out from mould and is used for strand is cut into scale is formed.

The arranged vertical of conticaster all devices makes it highly increase to 40-43 rice.The structural requirement of this class conticaster is lower than the hole of workshop ground level 25-27 rice for this equipment excavation, or builds high factory building.In both cases, the increase of conticaster height causes capital expenditure sharply to increase, and the operation of casting and technology are complicated.The height of restriction conticaster will limit casting rate or strand cross section to a certain extent, and therefore reduce the output of conticaster.This show vertical casting machine be unsuitable for casting big volume-for example from the converter of 300-400 ton capacity-metal.Because in this case, metal will retain the long time in ladle.In addition, the height of restriction conticaster also can limit the length of single base.

(for example caused designing its component devices reducing effort aspect the continuous casting height along the conticaster of curved arrangement, see London international conference paper " continuous casting steel machine " in 1977, be translated from English, Moscow " metallurgical industry publishing house ", 1982,116-140 page or leaf (See, for example, " Continuous casting of steel ".Papers of the International Conference，Lodon，1977.Trsltd from English。Moscow“Metallurgizdat”，1982。PP.116-140）〕。Compare with vertical casting machine, these conticasters have the servicing unit of bending or aligning strand, because strand is along being shaped in the arc mold of curve setting and the secondary cooling system, perhaps straight strand is at first crooked in a special device (being called vertical continuous casting base bending apparatus).In both cases, Wan Qu strand is aligned and is in a horizontal position.

This class conticaster is confidential shorter than vertical continuous casting, it has the higher characteristics of casting rate, because the static pressure of liquid metal does not limit casting rate, but the strand of its production random length, under same output, can save the capital expenditure of 30-50%, because capital equipment is installed in more than the mill floor, is convenient to the operation of conticaster.

Yet itself there is following shortcoming in this class conticaster: owing to the curved profile of secondary cooling system makes design complicated; With regard to vertical casting blank bending conticaster, also need aligning and throwing and bending mechanism; The strong load of equipment often causes breaking down (particularly secondary chill roll and aligning drawing device) and forces the designer to increase the power and the metal consumption of whole conticaster; Produce the adjustment complexity of built-in unit; Need the high surface temperature (reaching 1000 ° of degree) of maintenance, so just can not increase intensity of cooling, thereby can not improve setting rate; Strand excessive and too small edge grain evenly cools off difficulty in the secondary cooling system, makes strand might form heterogeneous structure; The distribution of non-metallic inclusion on the whole thickness of strand is asymmetric; The particularly high red brittleness steel billet of strand, twice crooked may cracking, like this, limited its casting rate because of must in certain radius of curvature limit, solidifying fully.

Horizontal type continuous casting machine does not have the shortcoming of shaped form conticaster.But, horizontal type continuous casting machine is (referring to for example horizontal stainless steel continuous casting of " husband of section " steel mill, 1985,62, No. 10 " steelwork " (cf.e.g., Horizontal Continuous Casting of Stainless Steel at " Kove steel " Works, " Iron and steel Eng. " 1985,62, NO.10)) only be applicable to the strand of casting small bore: by the cross section of 30-50 ton casting that ladle delivers 110 take advantage of 110 millimeters with interior square billet or diameter at 180 millimeters with interior round base.This restriction is that the intensity of this jockey is lower owing to exist jockey to cause between the device of Sheng metal and the mold.

The invention that proposes with this paper on technical spirit is immediate to be (to see that M.S. Bo Yiqieke .V.S. eats thatch in order to the inclined continuous casting machine of producing square billet, V.V. rich Er Makete " continuous casting steel machine ", Moscow " metallurgical industry publishing house " 1961,15-16,61-64 page or leaf (See " Continuous casting of steel " by M.S.Boychenko, V.S.Rutes, V.V.Fulmacht, Moscow " Metallurgizdat ", 1961, PP.15-16,61-64)), this conticaster is included in the mould of the inclination that is arranged in order on the production line, secondary cooling system, middle roller (guide) apron, the crawler type Blank drawing machine that throwing is used; Strand is bent thereon so that the strand along continuous straight runs continues mobile shaped form roller bed and automanual strand cutter sweep.

The inclined continuous casting machine height is lower, thereby greatly reduces engineering cost, and its device structure simply and for ease of maintenaince.

Yet, this conticaster is not used widely industrial, because by along the control metal flow to the mold axis on very long tubular fire passage (bobbin) metal is injected very difficulty of mold, in fact stable casting condition and high-quality surface can not be arranged.The unidirectional fractional condensation of the non-metallic inclusion on the whole thickness of the dissymmetrical structure of strand and strand hinder conticaster under conventional conditions at wide top casting slab (as arc and shaped form conticaster).Because the static pressure of liquid metal reduces greatly in the highly lower inclined continuous casting machine, the upper surface of strand caves in because of contraction.In addition,, non-metallic inclusion and bubble are accumulated under the upper surface of strand, reduce metal quality because freezing period is longer.

Main purpose of the present invention provides a kind of inclined continuous casting machine with less metal consumption, guarantees to produce high-quality straight strand.

This problem can be resolved by a kind of inclined continuous casting machine is provided, and this conticaster comprises rectangle mold, the secondary cooling system of inclination, drawing device that strand is pulled out from mold and the device that strand is cut into scale.More than listed each several part be sequentially arranged in along on the production line of strand shaping direction, according to the present invention, mold is placed on the leptoprosopy and production line is rectilinear.

Can significantly reduce the metal consumption of conticaster like this owing to saved the equipment of crooked and aligning strand, because of the static pressure that reduced the liquid phase molten steel with eliminated that be forced to be out of shape can be with cast very thick strand and improved the quality of strand of high casting rate.

Production line and horizontal angle are about 20 °-60 °.

Can reduce the height of conticaster like this, and on mill floor, arrange the said equipment, thereby the capital expenditure that can significantly reduce metal consumption and build conticaster, and improved condition of work and the maintenance of being convenient to production equipment.

Inner surface above the rectangle mold should be made spirogyrate.

Can prevent the depression of upper surface like this and form rippled surface, and form the strand of the top projection of free of surface defects.

By way of example the present invention is illustrated referring now to accompanying drawing.

In the accompanying drawing:

Fig. 1 is the schematic diagram according to inclined continuous casting machine of the present invention;

Fig. 2,3 and 4 is the mold sectional views according to the strand of the rectangular bloom that is used to cast of the present invention, beam shape base and band convex upper surface;

Fig. 5 is the metal bath surface position of mold according to the present invention when becoming 30 ° of angle lappings oblique with horizontal plane.

The inclined continuous casting machine that is provided comprises the following part on the straight production line that is sequentially arranged in: be placed in the mold 1 of the inclination on the leptoprosopy, this mold is a rectangle or approximate rectangular; Secondary cooling system 2 with mold 1 adjacent installation; These cooling system 2 back are the drawing devices 3 that are used for pulling out from mold 1 strand 4; Strand 4 is cut into device 5(Fig. 1 of scale).The top of mold 1 is the pans 8 that have the ladle 6 of metering device 7 and have the metering gate (not shown in figure 1).This metering gate is connected with the perpendicular elongate refractory nozzle 9 that is used for below the fusion liquid level of motlten metal injection inclination mold 1.The cross section of mold 1 can be rectangle or approximate rectangular (Fig. 2), also can be I-beam (Fig. 3) or the rectangle (Fig. 4) that has outer convex surface 10.

The linear production line of conticaster makes strand 4 up to solidifying the shape that still remains unchanged fully, so just improve the quality of strand 4 and enlarged the kind of casting metals, having improved casting rate is the production capacity of conticaster, and has reduced metal consumption owing to having cancelled the equipment that is used for bending and aligning strand 4.

Linear production line and horizontal angle are 20 °-60 °, can reduce like this conticaster height and can be on mill floor apparatus arrangement, thereby the capital expenditure that can significantly reduce metal consumption and build conticaster; Improve working condition simultaneously and be convenient to the maintenance of conticaster.

If the inclination angle of conticaster is less than 20 °,, make to be difficult to metal be injected the mold 1 of inclination by means of vertically disposed elongated refractory nozzle 9 because the melting metal layer on mold 1 bottom surface is too little and the appearance of strong meniscus.On the contrary, if the inclination angle of production line is then compared with vertical casting machine greater than 60 °, and the advantage that reduces the conticaster height has not just existed.

Rectangle mold 1 is arranged on metal is injected into below the fusion face by present widely used elongated refractory nozzle 9.Like this, because the minimizing of non-metallic inclusion has also improved the quality of strand 4, because the metal meniscus is significantly expanded in the mold 1 in this case, and metal is significantly less than translational speed on arc and vertical mold when all other conditions are identical in mold 1 lip-deep translational speed.For example, when production line became 30 ° of angle lappings oblique with horizontal line, the length a of meniscus was two times of strand 4 width b, as shown in Figure 5, the surface area of meniscus also correspondingly is twice, and the flowing velocity of metal under the top layer also reduces half in the mold 1.Thereby the time of contact that has prolonged metal and covered the heat insulation slag of the metal meniscus in the mold 1, moving (come-up) and being absorbed the condition that provides like this for non-metallic inclusion by slag blanket.Mold 1 is arranged on the restriction of also having eliminated on the leptoprosopy strand 4 shape of cross sections, and the kind of the strand cross section that can cast is far above in shown in Fig. 2 to 4, and the width of strand has also increased.

The convex shape of top 10 inner surfaces of mold 1 helps to form above the convex self-sustaining of strand 4, can prevent the depression and the wave inception wrinkle on top layer, prevents that strand 4 upper surfaces from crackle occurring, form surperficial pipe and can reduce the side cutting quantity.

Different with horizontal type continuous casting machine.Conticaster of the present invention does not have the coupling part between the container of containing metal and mold, therefore eliminated strand cross section and casting metals quantitative limitation.

The inclined continuous casting machine that this paper provided has following function: through metering device 7 metal is injected pans 8 from ladle 6, the elongated refractory nozzle 9 under metering gate (not shown in figure 1) and vertically disposed immersion metal bath surface is cast in the mold 1 that is placed in the inclination on the leptoprosopy again.Meniscus of having expanded greatly in the mold 1 that tilts and lower molten steel flow speed are by the come-up of non-metallic inclusion and be capped that the condition that provides is provided the heat insulation slag of metal meniscus in the mold 1.Improved the quality of metal like this owing to the removal of non-metallic inclusion.

The shell of the strand 4 that forms in mold 1 can bear the static pressure and the pulling force of molten metal.Strand 4 is drawn out from mold 1 continuously by secondary cooling system 9 at a predetermined velocity, and strand 4 is cooled to complete curdled appearance by the nozzle (not shown in figure 1) in secondary cooling system.The strand 4 of crystallization cuts into scale by the device 5 that is installed in drawing device 3 back fully.

When the less strand of casting length of side ratio, can after solidifying fully, strand make it go to horizontal level.

Because the mold 1, secondary cooling system 2, the drawing device 3 that tilt and being used for cuts into strand 4 in the device 5 of scale and is arranged in order along a straight production line, strand 4 is not distortion in forming process, so just improved quality, and do not limit casting rate, thereby increased the output of conticaster.

When strand 4 tilts and when straight line moves at leptoprosopy, can cause than arc and the shaped form conticaster is better and more uniform secondary cooling condition, the water consumption of the latter on wide of too small with the excessive strand of radius is different.

10 inner surface is the inclination mold 1 of spirogyrate above using, owing to having eliminated casting blank outer cover and having gone up convex surface the be shaped depression of initial stage epicuticle and the quality that fold has been improved strand 4, eliminated above the convex of strand rolling during pipe and other blemish on the side.

Because the inclination of conticaster and arranged in a straight line makes it highly very low; Do not need crooked and aligning strand 4, thereby eliminated restriction, for evenly cooling off and improving metal quality and created condition casting rate, secondary intensity of cooling; Reduce the metal consumption of conticaster simultaneously, made things convenient for the Operation and maintenance of process equipment.

Crooked and the aligning that continuous billet casting does not need strand is installed and formed to the rectangle mold in the inclination on the leptoprosopy on straight production line, and eliminated restriction to casting blank section shape and casting rate, thereby improved slab quality, enlarged the variety range of casting metals, can on inclined continuous casting machine, carry out the casting of rectangle (plate) base expeditiously, and solve and be present in as being cast into problem the mold from the vertically disposed elongated mouth of a river metal in the traditional approach of vertical and shaped form conticaster.

Straight production line approximately becomes 20 ° to 60 ° angle lappings tiltedly can reduce the height of conticaster and make apparatus arrangement on mill floor with horizontal line, this has reduced required metal consumption and can reduce the capital expenditure of building conticaster, has made things convenient for the Operation and maintenance of process equipment simultaneously.

Inner surface above using is the mold of spirogyrate, owing to the be shaped depression and the ripple wrinkle of initial stage strand epithelium of the strand that has prevented casting blank outer cover and had a convex upper surface improved slab quality, also prevented from pipe and other blemish to occur on the side during rolling.

Claims (3)

1, a kind of inclined continuous casting machine, comprise inclination rectangle mold (1), secondary cooling system (2), be used for drawing device (3) that strand (4) is pulled out from mold (1) and the device (5) that is used for strand is cut into scale, all above-listed equipment are sequentially arranged on the production line along strand shaping direction, it is characterized in that: mold (1) is placed on the leptoprosopy and production line is rectilinear.

2, inclined continuous casting machine according to claim 1 is characterized in that: production line and horizontal angle are approximately 20 ° to 60 °.

3, according to claim 1,2 described inclined continuous casting machines, it is characterized in that: the inner surface of (10) is a spirogyrate above the rectangle mold (1).

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