CN102886501A - Tooling for efficiently manufacturing wide thick plate blank for wide thick plate rolling machine and manufacture method thereof - Google Patents
Tooling for efficiently manufacturing wide thick plate blank for wide thick plate rolling machine and manufacture method thereof Download PDFInfo
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- CN102886501A CN102886501A CN2012103803900A CN201210380390A CN102886501A CN 102886501 A CN102886501 A CN 102886501A CN 2012103803900 A CN2012103803900 A CN 2012103803900A CN 201210380390 A CN201210380390 A CN 201210380390A CN 102886501 A CN102886501 A CN 102886501A
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Abstract
The invention relates to the field of the manufacture of a wide thick plate blank for a wide thick plate rolling machine, in particular to a tooling for efficiently manufacturing the wide thick plate blank for the wide thick plate rolling machine and an efficient manufacture method of the wide thick plate blank, aiming at the problems such as cavity shrinking, loosing and cracking and the like of the plate blank and the low manufacture efficiency. The manufacture tooling is provided with a pouring system, an ingot mould, an insulated feeder, a pouring trolley, an automatic control pouring transit line, a heat preservation cover and a burial pit. Before pouring, the ingot mould, the pouring system and a chassis are assembled on the pouring trolley, and the insulated feeder is preheated. The pouring is carried out slowly; after pouring, high-temperature demolding is carried out, and the temperature of a steel ingot is kept by the heat preservation cover; and then the steel ingot is carried away by the trolley, and is hoisted into the burial pit to be slowly cooled. Finally, a flash groove is cut out of the wide thick plate, so that the flashes and strains can be removed, and the wide thick plate is put into a thermal treatment furnace to be annealed. The tooling and the method are applicable to the production of the thick plate blanks with thickness of 350-1200mm and weight of 20-70 tons.
Description
Technical field
The present invention relates to wide and heavy plate mill and make the field with generous slab, specifically a kind of wide and heavy plate mill is with high efficiency manufacture frock and the method for generous slab.
Background technology
Wide and heavy plate mill is representing a national Iron ﹠ Steel Development level, and the U.S. just has wide and heavy plate mill in the forties in last century, and the wide and heavy plate mill maximum opening degree of Japan reaches 1500mm, can the above slab of rolling 500mm.China also began to build the Wide and Thick Slab steel rolling production-line in recent years, especially to 21 century, China gone into operation many 5000mm 5500mm Wide and Thick Slab steel rolling production-line, comprise that the enterprises such as Baosteel, Anshan iron and steel plant, Wuyang steel mill have all built the Wide and Thick Slab steel rolling production-line.Along with the development of national economy and national defense construction, the consumption of Wide and Thick Slab grows with each passing day, and ocean platform, pipeline steel, warship hull steel etc. all need a large amount of Wide and Thick Slab, and needed Wide and Thick Slab quality is also improving constantly.
Guarantee the Wide and Thick Slab quality, be difficult to finish only according to mill milling, must improve the used generous slab quality of rolling Wide and Thick Slab, generous slab quality is the basic assurance of Wide and Thick Slab quality.In order to improve generous slab quality, some new technologies of domestic-developed are carried out generous slab manufacturing.At first be to adopt the electroslag remelting mode to make generous slab, fact proved, generous slab quality is improved, but production efficiency is lower, and one 60 tons heavy generous slab needed just can finish in more than 30 hour.In addition, some enterprises adopts the water-cooled die casting method to produce, owing to there being the problem such as crackle, effect is also undesirable.Some enterprises make generous slab with the large-scale round ingot of die casting by the hydraulic press cogging, about 3000 yuan per ton of hydraulic press cogging expense, and cost is high, and is difficult to realize producing in enormous quantities.
Summary of the invention
The object of the present invention is to provide a kind of wide and heavy plate mill efficiently to prepare frock and preparation method with generous slab, solve slab production efficiency low, the problem such as quality is unstable.
Technical scheme of the present invention is:
A kind of wide and heavy plate mill efficiently prepares frock with generous slab, and this fabricating tools is provided with running gate system, chassis, ingot mould, insulated feeder, transport trolley, stay-warm case, burial pit and temperature measuring equipment, and concrete structure is as follows:
Transport trolley is established in orbit, and the chassis is fixed on the load carrying platform of transport trolley; Build the running gate system that refractory brick forms by laying bricks or stones on the chassis, running gate system adopts bottom filling stable filling type running gate system, and sprue is up big and down small, adopts the brick one-tenth of shaping feed trumpet; Cross gate adopts the equal diameter structure, and the cross gate tail end arranges slag trap; Adopt two above ingates, reduce one by one with the increase ingate diameter of distance sprue distance; Ingot mould adopts the square ingot mould of up-small and down-big back draught, up and down consistency of thickness; Ingot mould, feed trumpet all are assemblied on the chassis, and thick chassis is adopted on the chassis; Rising head is assemblied on the ingot mould, adopts insulated feeder; A whole set of heavy slab casting mold, all assemble at transport trolley on ingot mould, gate spool, rising head, chassis, and casting process and insulating process are finished at chassis; After the strand shake out, stay-warm case is covered on the slab, the stay-warm case lower end is dropped on the chassis, keeps sealing; Steel ingot through after the insulation places the burial pit slow cooling; Temperature measuring equipment whole process using thermocouple temperature measurement system monitors slab hull-skin temperature after ingot mould surface temperature and the demoulding after the heavy slab cast.
Described wide and heavy plate mill efficiently prepares frock with generous slab, and running gate system adopts up big and down small sprue, the sprue back cut diameter
Lower port diameter
Feed trumpet brick thickness 30～60mm; Cross gate adopts equal diameter refractory brick tube, diameter
Cross gate tail brick is with slag trap; Ingate is directly left on cross gate vertically upward, 2～8; With the increase of distance sprue distance, the ingate diameter reduces successively, is respectively
Arrive
Described wide and heavy plate mill efficiently prepares frock with generous slab, and ingot mould adopts the square ingot mould of up-small and down-big back draught, ingot mould tapering 1%～5%; Ingot mould thickness 200～350mm, ingot mould adopts uniform wall thickness, and profile is consistent with inboard shape; Ingot mould hangs handle on wide facial plane, and two of every sides are hung shank diameter 300～450mm.
Described wide and heavy plate mill efficiently prepares frock with generous slab, and the insulated feeder tapering is 1～8%, height 300～600mm; Rising head adopts three-decker, and outer rising head case is cast iron materials, building heat-insulation brick in the rising head case, and insulating brick thickness 30～180mm, material are light weeight alumina brick or clay brick, hang warming plate, warming plate thickness 10～60mm in the insulating brick.
Described wide and heavy plate mill efficiently prepares frock with generous slab, and transport trolley is the special-purpose slab transport trolley of Wheeltrack structure, is the industrial railway track below the transport trolley, and transport trolley assembles heavily loaded train wheel; The transport trolley bogie structure is identical with cargo train, and the assembling load carrying platform is disk construction on the bogie.
Described wide and heavy plate mill efficiently prepares frock with generous slab, and stay-warm case is the heavy slab stay-warm case, the square bar shelf structure, and skin is steel plate, and intermediate course is that sial is cotton, and internal layer adopts steel wire, and fixedly sial is cotton.
Utilize the wide and heavy plate mill of described frock with the high efficiency preparation method of generous slab, transport trolley is put put in place, chassis, ingot mould, feed trumpet are fixed on the chassis, build refractory brick by laying bricks or stones; Simultaneously, rising head is carried out preheating, and the rising head after the preheating is assembled on the ingot mould; Carry out the heavy slab cast by technological requirement, after generous slab solidifies, under the condition of high temperature, carry out shake out, successively rising head and ingot mould are deviate from from slab top, with stay-warm case with on the slab cover, after insulation, utilize transport trolley that slab is transported to the burial pit place and carry out slow cooling, put at last heat-treatment furnace and carry out annealing in process.
Described wide and heavy plate mill is with the high efficiency preparation method of generous slab, adopt insulated feeder that generous slab is carried out the top feeding, the double-layer heat insulation rising head adopts the skin internal layer of laying bricks to hang the warming plate mode and make, and outerly builds by laying bricks or stones with insulating brick, and the internal layer warming plate is light heat insulation material; After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 200 ℃.
Described wide and heavy plate mill adopts up-small and down-big form with the high efficiency preparation method of generous slab, ingot mould, the little 80～200mm of Width end opening width suitable for reading; Before the cast, ingot mould is cleared up, removed surperficial iron rust, then ingot mould is preheated to more than 60 ℃; To ingot mould inner chamber swabbing, thickness of coating layer is 0.2～5mm thereupon.
Described wide and heavy plate mill is with the high efficiency preparation method of generous slab, adopt stable filling type running gate system slowly to pour into a mould, poring rate 0.5～5.0t/min adds thermal-insulating covering agent in the casting process, addition 0.1～2.5kg/t, thermal-insulating covering agent adopt the sieve mode of spreading to add; Adopt seal closure to seal between down gate and the steel ladle sliding water gap, and in seal closure, be filled with argon gas protection.
Described wide and heavy plate mill makes each ingate evenly distributed from big to small with the high efficiency preparation method of generous slab, chassis when building refractory brick by laying bricks or stones, the refractory brick of afterbody refractory brick with slag trap; Build by laying bricks or stones finish after, the surface covers the chassis with steel plate, at the ingate place, steel plate is left and the onesize hole of ingate.
Described wide and heavy plate mill behind casting complete, when slab outer surface solidified layer thickness reaches 20～300mm, carries out hot shake-out with the high efficiency preparation method of generous slab; Open insulated feeder, the insulated feeder internal layer is adhered on the slab; Hang away ingot mould with crane, with on the red heat slab cover, make in situ upper insulation of heavy slab with stay-warm case, the steel slab surface temperature is maintained in 800～1200 ℃ of scopes, behind insulation 3～15h, utilize transport trolley that slab is transported to the burial pit place and carry out slow cooling; After below the slow cooling to 200 ℃, slab enters heat-treatment furnace and carries out annealing in process.
The invention has the beneficial effects as follows:
1. technological design of the present invention is reasonable, has shortened the production cycle of foundry goods, has improved productivity ratio.Utilize brand-new ingot mould method for designing, adopted hot shake-out technique, make the slab Quick-forming, production efficiency is high.
2. the present invention has adopted special-purpose stable filling type running gate system, has designed special sprue, cross gate, ingate, makes in the casting process molten steel forming steady, has reduced secondary oxidation and has been mingled with and rolls up the defectives such as gas, has improved slab quality.
3. adopted rational Insulation, given full play to slab from the feeding ability, make metal in insulating process, finished from outside to inside from feeding, overcome slab crackle, the defective such as loose; Adopt rational Technology for Heating Processing, make the slab microstructure homogenization, improve the slab serviceability.
4. the present invention is applicable to the manufacturing of the generous slab of various models and specification.The generous slab that utilizes the present invention to produce carries out Plate rolling, can improve plate property, reduces cost, carry out in this way a large amount of productions of Wide and Thick Slab, be easy to obtain customer acceptance, because market potential is huge, in case be widely adopted, generous slab will produce the output value of hundreds of hundred million.
5. the present invention is applicable to thickness between 350～1200mm, and weight is 20～70 tons heavy slab production.
In a word, the present invention adopts stable filling type running gate system, designed Novel ingot mold, carry out hot shake-out, given full play to slab from the feeding ability, reduced slab secondary oxidation tendency, shrinkage cavity, rarefaction defect have been eliminated, improved slab production efficiency and slab quality, heavy slab is produced in a large number, satisfying domestic many Wide and Thick Slab steel rolling production-line demands becomes possibility.
Description of drawings
Fig. 1 (a)-(b) is generous slab fabricating tools schematic diagram; Wherein, Fig. 1 (a) is for before pouring into a mould, and Fig. 1 (b) is for after pouring into a mould.Among the figure, 1-transport trolley, 2-chassis, 3-feed trumpet, 4-ingot mould, 5-insulated feeder, 6-stay-warm case.
Fig. 2 is the transport trolley schematic diagram.The 21-track, 22-wheel, 23-bogie, 24-load carrying platform.
Fig. 3 is heavy slab formation system assembling schematic diagram.Among the figure, 31-sprue funnel brick, 32-sprue cast tube brick, 33-sprue angle brick, the 34-cross gate leads directly to brick, 35-ingate brick, 36-slag trap brick, 37-insulated feeder case, 38-insulating brick, 39-warming plate, 40-thermal-insulating covering agent.
Fig. 4 (a)-(b) is heat insulation cover structure figure; Wherein, Fig. 4 (a) is front view, and Fig. 4 (b) is top view.Among the figure, the 41-steel plate, the 42-sial is cotton, 43-steel wire, 44-hanger.
Fig. 5 is flow field simulation figure as a result in the cavity filling process.
Fig. 6 is temperature field simulation figure as a result in the process of setting.
Fig. 7 is as a result figure of shrinkage cavity, loose distribution simulation.
The generous slab exemplar of Fig. 8 for adopting the present invention to produce.
The steel plate of Fig. 9 for adopting the present invention to produce.
The specific embodiment
Shown in Fig. 1 (a)-(b), the present invention has designed a whole set of generous slab fabricating tools: semicontinuous cast heavy slab production line, comprise transport trolley 1, chassis 2, feed trumpet 3, ingot mould 4, insulated feeder 5, stay-warm case 6 and burial pit and temperature measuring equipment (thermocouple temperature measurement system) etc., concrete structure is as follows:
In the running gate system, sprue is up big and down small, the sprue back cut diameter
Lower port diameter
Feed trumpet brick thickness 30～60mm; Cross gate adopts equal diameter refractory brick tube, diameter
Cross gate tail brick is with slag trap; Ingate is directly left on cross gate vertically upward, 2～8; With the increase of distance sprue distance, the ingate diameter reduces successively, is respectively
Arrive
Before the cast, ingot mould, running gate system, chassis are assembled at the cast chassis, insulated feeder is preheated to more than 200 ℃.Adopt slow pouring type to pour into a mould, after the cast, adopt the high temperature stripping means to carry out the demoulding, after removing feed trumpet 3, ingot mould 4 and insulated feeder 5 after the cast, utilize 6 pairs of steel ingots of stay-warm case to be incubated; After insulation, transport with chassis again, hang in burial pit (melt pit) and carry out slow cooling.At last, generous slab cuts rising head, removes burr, puts into heat-treatment furnace and carries out annealing in process.Casting complete is to entering in the furnace annealing process, and whole process using thermocouple temperature measurement system detects ingot mould and casting blank surface temperature, to determine the heavy slab curdled appearance.
As shown in Figure 2, the transport trolley system mainly comprises: track 21, wheel 22, bogie 23, load carrying platform 24, and concrete structure is as follows:
As shown in Figure 3, the heavy slab formation system mainly comprises: sprue funnel brick 31, sprue injecting pipe brick 32, sprue angle brick 33, the straight-through brick 34 of cross gate, ingate brick 35, slag trap brick 36, insulated feeder case 37, insulating brick 38, warming plate 39, thermal-insulating covering agent 40, and concrete structure is as follows:
Insulated feeder is comprised of insulated feeder case 37, insulating brick 38, warming plate 39, insulating brick 38 and warming plate 39 are arranged in the insulated feeder case 37, insulating brick 38 interior extension warming plates 39, outer layer insulating brick 38 is clay brick, thermal conductivity factor 0.2～the 2.0W/mK of insulating brick, make rising head have sufficient intensity, can reuse; Internal layer warming plate 39 is light heat insulation material, and the thermal conductivity factor of warming plate is 0.1～0.5W/mK.During shake out, the internal layer warming plate sticks on the slab, can not reuse; Wherein: insulated feeder case 37 play supporting role, and 38 insulation effects of insulating brick play supporting role to the warming plate 39 of front simultaneously, the warming plate 39 main insulation effects that rise.First insulating brick 38 is built in insulated feeder case 37 by the shape dress, inner surface is as far as possible smooth, again warming plate 39 is fixed on insulating brick 38 inboards, outer insulated feeder case 37 is cast iron materials (as: HT200), insulating brick is finished with masonry way, be combined closely with the rising head case, insulating brick intensity is enough high, can reuse.The warming plate thermal conductivity factor is low, good heat-insulation effect, but intensity is lower, when shake out, staggers between warming plate and the insulating brick, and warming plate is stayed on the slab of red heat, has continued insulation effect.After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 200 ℃.
Shown in Fig. 4 (a)-(b), stay-warm case comprises: steel plate 41, sial cotton 42, steel wire 43, hanger 44, and concrete structure is as follows:
Press is three-decker from outside to inside: steel plate 41, sial cotton 42, steel wire 43 arrange hanger 44 at the top of stay-warm case.
The course of work that heavy slab of the present invention efficiently prepares frock comprises:
At first carry out the mould assembling, transport trolley 1 is located on the track 21, chassis 2 is fixed on the load carrying platform 24 of transport trolley 1; 2 build refractory brick by laying bricks or stones on the chassis, feed trumpet 3 is fixed on the chassis 2, and in feed trumpet 3 the feed trumpet brick is installed; Ingot mould 4 is installed on the chassis, and ingot mould 4 large mouths are downward, osculum makes progress; At ingot mould 4 insulated feeder 5 is installed; Next is poured into a mould, and in the casting process, adopts argon for protecting pouring; ladle tapping slide gate nozzle is with after sprue is aimed at; liquid feeding stream protection seal closure between slide gate nozzle and sprue funnel brick 31, and in seal closure, be filled with argon gas protection, reduce the molten steel oxidation.Simultaneously, adopt slow pouring type to pour into a mould, alleviate the molten metal splash; At last, molten metal carries out shake out (demoulding), insulation under the condition of high temperature after solidifying a period of time, send the burial pit slow cooling; Then, put into heat-treatment furnace and carry out the homogenizing annealing processing.
Utilize this method to pour into a mould generous slab, can pour into a mould simultaneously the polylith slab, shake out time early, efficient is high; Adopt argon shield, stable filling type running gate system and slow pouring technology, can reduce oxidation, minimizing is mingled with; Hot shake-out, online insulation can take full advantage of the slab waste heat and make slab Slow cooling in burial pit, has solved the problems such as slab shrinkage cavity, loose, crackle, has produced qualified generous slab; Generous slab is through the steel plate of the rolling final acquisition thickness of heavy and medium plate mill greater than 20mm, dense structure, and flaw detection reaches 2 grades of levels of GB/T2970.
Among the present invention, stable filling type running gate system can adopt Chinese invention patent application: a kind of without air gap stable filling casting method for designing and used running gate system, application number 200310105217.0.
The present invention is generous, and the slab high efficiency preparation method is as follows:
1, in forging and the operation of rolling, substantially can not eliminate inclusion defects, the operation of rolling of generous slab can not be eliminated inclusion defects equally, in generous slab preparation process, strictly controls level of inclusions extremely important.Guarantee the degree of purity of Wide and Thick Slab, minimizing is mingled with, and need to carry out sublimate and smelt, and improves Molten Steel Cleanliness; Casting process reduces oxidation, adopts argon shield, and metal bath surface is put covering slag; Utilize stable filling type running gate system, slowly cast makes molten metal carry out die cavity steady, does not produce splash; Behind the casting complete, add thermal-insulating covering agent, utilize the sieve mode of spreading to add, reduce coverture metal bath surface is impacted.
Thermal-insulating covering agent did not add before cast, after the cast beginning, began when seeing the bright metal liquid level to add.Add thermal-insulating covering agent in the casting process, addition 0.1～2.5kg/t.In the whole casting process, coverture covers liquid level always, makes liquid level all be in the protection of coverture, does not have dew point.
2, the generous slab shrinkage cavity of traditional handicraft method preparation, loose serious, defective disunion in the operation of rolling causes steel plate to scrap.The present invention strictly controls shrinkage cavity, loose, mainly adopts insulated feeder, and insulated feeder case inboard arranges insulating brick, and warming plate is pasted in the insulating brick inboard, increases the feeding capacity of rising head, can effectively increase the utilization rate of rising head, reduces by a shrinkage cavity.Simultaneously, adopt hot shake-out technique, give full play to metal from the feeding ability, reduce rarefaction defect.
3, generous slab efficiently prepares.Adopt hot shake-out technique, mould is fully used; Adopt the transport trolley mode to pour into a mould and transport slab, realized semicontinuous cast; Adopt up-small and down-big square slab, dwindled rising head, reduced polishing, repairing and remove feeders workload.
Such as Fig. 1, Fig. 2, shown in Figure 3, efficient preparation technology is as follows for generous slab:
As seen from Figure 1, chassis 2 is fixed on the transport trolley 1, cast station and the shake out station of slab can be adjusted arbitrarily, feed trumpet 3, ingot mould 4 are arranged on the chassis 2, running gate system and slab die cavity are successfully linked together, insulated feeder 5 drops on the ingot mould 4, makes insulated feeder give full play to the feeding effect.
As seen from Figure 2, transport trolley 1 belongs to heavily loaded chassis, at stations such as cast, shake out, insulation, slow cooling track is arranged all, and transport trolley 1 can free in and out each station, has improved the transport efficacy of slab.
As seen from Figure 3, casting process is that molten steel enters running channel from sprue funnel brick 31, enter cross gate by sprue injecting pipe brick 32, sprue angle brick 33, flowed forward by the straight-through brick 34 of cross gate, when running into ingate brick 35, molten steel has an opportunity to enter die cavity again, but in fact molten steel is full of first cross gate, directly enter slag trap brick 36, return to make liquid level rising in the cross gate again, molten steel begins to enter die cavity from ingate 35.Molten steel enters into after the ingot mould 4, and beginning is steadily risen, and adds covering slag, prevents the metal bath surface oxidation.When molten steel entered into insulated feeder 5, control cast height added thermal-insulating covering agent, casting complete.
4, the main technologic parameters that efficiently prepares generous slab: (1) has finished Design of Runner System by computer simulation, key design ingate size and number, ingate vertically upward, ingate quantity is 2～8, the ingate diameter reduces successively, is respectively
Arrive
Not etc.(2) strictly control pouring temperature, high temperature is come out of the stove, external refining, and pouring temperature is calculated by different steel grade liquidus temperatures, for being higher than liquidus temperature more than 30 ℃.(3) adopt hot shake-out technique, after the cast, solidify the certain hour shake out, shake out time is determined according to the simulation setting time.As shown in Figure 5, the temperature field of generous Solidification Process in Continuous Slab Casting.Determine setting time, shake out during the thick 50～300mm of slab solidified shell by the temperature field of calculating foundry goods; Hang first the rising head case, hang away ingot mould, with on the slab cover, control slab surface temperature is 800～1200 ℃ with stay-warm case.(4) behind insulation 3～15h, be transported to burial pit and carry out slow cooling.Below the slow cooling to 200 ℃, advance heat treatment kiln again, carry out homogenizing annealing and process, furnace temperature is consistent with casting temperature, and the temperature difference is no more than 100 ℃, and after slab enters heat-treatment furnace, carries out first samming, after temperature is in full accord, heats up again.Among the present invention, the homogenizing annealing heat treatment temperature is 900～1120 ℃, and temperature retention time is 4～12h, cools off with stove.
As shown in Figure 1, the present invention has determined poring rate according to the pouring technology requirement, requires the design insulated feeder according to feeding the duration of pouring, simultaneously according to being incubated requirement behind the shake out, has designed stay-warm case; Be specially:
1) pouring temperature and speed: pouring temperature is determined according to the liquidus temperature of material, utilizes the liquidus temperature of software Calculating material, determines that pouring temperature is above 30～80 ℃ of liquidus curve; Poring rate be 0.5～5.0t/min(ton/minute), 60t slab duration of pouring is more than 40min.
2) insulated feeder: according to the feeding requirement, design double-layer heat insulation rising head, the double-layer heat insulation rising head adopts building heat-insulation brick to finish with the mode that the interpolation warming plate combines, in the insulated feeder casing, with light-weight brick building heat insulation lining, the inside is mended the one layer of heat preservation plate again, forms the double-layer heat insulation rising head, the rising head tapering is that 1～8%(insulated feeder internal diameter is up-small and down-big), highly be 300～600mm.
Warming plate thickness 10～60mm, the R200mm circular arc is made at the inner corner place.Insulating brick thickness 30～180mm, material are light weeight alumina brick.After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 200 ℃.
3) ingot mould: ingot mould is rectangle, adopts cast iron HT200 material, and thickness 200～350mm, tapering are 1～5%.Convenient for shake out (demoulding), adopt up-small and down-big form, upper young, be conducive to hot shake-out, the narrow 80～200mm of Width end opening width suitable for reading.Before the cast, ingot mould is cleared up, removed surperficial iron rust, then ingot mould is preheated to more than 60 ℃; To ingot mould inner chamber swabbing, thickness of coating layer is 0.2～5mm thereupon.
Among the present invention,
L is length suitable for reading or the width of rising head or ingot mould, and l is end opening length or the width of rising head or ingot mould, and H is the height of rising head or ingot mould.
4) stay-warm case: the slab stay-warm case is the heavy slab stay-warm case, the square bar shelf structure, and skin is steel plate, and thick 3～5mm, intermediate course are that sial is cotton, and thick 20～50mm, internal layer are steel wire, and fixedly sial is cotton.The steel plate inboard is provided with column, and steel wire firmly is connected with outer layer plate, and intermediate layer sial cotton is played the role of positioning.Hanging apparatus is installed in the stay-warm case outside, and four hangers are installed on stay-warm case, so that steadily lifting, leptoprosopy is installed respectively two and hung handle, in order to can set level in the transportation.After the slab shake out, stay-warm case is covered on the red heat slab rapidly, the stay-warm case lower end is dropped on the chassis, and sealing below keeping reduces heat loss.
5) transport trolley: transport trolley is the special-purpose slab transport trolley of Wheeltrack structure, is the industrial railway track below the transport trolley, and transport trolley assembles heavily loaded train wheel.Assembling heavy-duty freight car bogie assembles load carrying platform on the transport trolley wheel on the bogie, and load carrying platform is the welded steel structure.The transport trolley bogie structure is identical with cargo train, above load carrying platform be disk construction.The transport trolley design load is the 200t(ton), track structure is heavy structure, wheel, bogie, carrying platform design weight capacity are more than 200 tons.Transport trolley both sides assemblings lorry docking hook, can with engine advance release and each chassis between interlock.
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
The slab weight that the present embodiment adopts the present invention to produce is 40t, and the concrete technology parameter is as follows:
The sprue back cut diameter
Lower port diameter
Feed trumpet brick thickness 35mm; The cross gate internal diameter
Adopt 3 ingates, with reducing of distance feed trumpet distance, the ingate diameter is followed successively by 30mm, 40mm and 50mm.The ingot mould tapering is 2%, ingot mould thickness 300mm.Adopt the double-layer heat insulation rising head, riser height 300mm, rising head tapering are 2%, and the riser head heat-preserving brick adopts light weeight alumina brick, and thickness is 80mm, and the riser head heat-preserving plate thickness is 15mm; Before the use, the rising head preheat temperature is 300 ℃.
80 ℃ of ingot mould preheat temperatures, the zircon flour coating that internal spray 1mm is thick.The chassis is placed on the automatic transportation chassis, then assembles running gate system, ingot mould and rising head, carry out afterwards pouring metal melt.The molten metal material of cast is 16Mn, and the cast degree of superheat is 40 ℃, and poring rate is 1.0t/min, adopts sieve to spread on the metal bath surface of mode in the ingot mould and thermal-insulating covering agent in the casting process, and addition is 0.2kg/t.
1h after cast finishes, slab outer surface solidified layer thickness reaches more than the 100mm, carries out hot shake-out.Slough first rising head, then slough ingot mould, adopting the thermocouple temperature measurement system to detect the slab surface temperature is 1050 ℃, covers on the strand strand is implemented insulation with being about to stay-warm case, monitors casting blank surface temperature in the insulating process.Behind the insulation 5h, utilize transport trolley that slab is transported to burial pit and carry out slow cooling, then enter furnace annealing.In the present embodiment, the stress relief annealing heat treatment temperature is 600 ℃, and temperature retention time is 15h, cools off with stove.
The generous slab of 40t that the present embodiment adopts the present invention to produce, inner without the shrinkage cavity rarefaction defect, the steel plate that thickness is 150mm is produced without casting crack in the surface behind mill milling, and performance satisfies instructions for use.
The slab weight that the present embodiment adopts the present invention to produce is 60t, and size of plate blank is 1000 * 2700 * 3300mm.The concrete technology parameter is as follows:
The sprue back cut diameter
Lower port diameter
Feed trumpet brick thickness 50mm; The cross gate internal diameter
Adopt 4 ingates, with reducing of distance feed trumpet distance, the ingate diameter is followed successively by 30mm, 45mm, 60mm and 75mm.The ingot mould tapering is 4%, ingot mould thickness 350mm.Adopt the double-layer heat insulation rising head, riser height 500mm, rising head tapering are 4%, and the riser head heat-preserving brick adopts light weeight alumina brick, and thickness is 120mm, and the riser head heat-preserving plate thickness is 40mm; Before the use, the rising head preheat temperature is 300 ℃.
100 ℃ of ingot mould preheat temperatures, the zircon flour coating that internal spray 2mm is thick.The chassis is placed on the automatic transportation chassis, then assembles running gate system, ingot mould and rising head, carry out afterwards pouring metal melt.The molten metal material of cast is EH36, and the cast degree of superheat is 50 ℃, and poring rate is 3.0t/min, adopts sieve to spread on the metal bath surface of mode in the ingot mould and thermal-insulating covering agent in the casting process, and addition is 1.0kg/t.
1.5h after cast finishes, slab outer surface solidified layer thickness reaches more than the 150mm, carries out hot shake-out.Slough first rising head, then slough ingot mould, adopting the thermocouple temperature measurement system to detect the slab surface temperature is 1100 ℃, covers on the strand strand is implemented insulation with being about to stay-warm case, monitors casting blank surface temperature in the insulating process.Behind the insulation 12h, utilize transport trolley that slab is transported to burial pit and carry out slow cooling, then enter furnace annealing.In the present embodiment, the stress relief annealing heat treatment temperature is 500 ℃, and temperature retention time is 5h, cools off with stove.
The generous slab of 60t that the present embodiment adopts the present invention to produce, inner without the shrinkage cavity rarefaction defect, the steel plate that thickness is 200mm is produced without casting crack in the surface behind mill milling, and performance satisfies instructions for use.
Fig. 5 is the flow field simulation result of the generous slab casting process of the present embodiment, as seen adopts the structure of stable filling type running gate system and two above ingates to guarantee the stationarity in the cavity filling process.Fig. 6 is the Calculated Results of Temperature Field of Solidification Process in Continuous Slab Casting, and the use of insulated feeder and stay-warm case has guaranteed molten metal solidification sequence from bottom to top, is conducive to feeding.Fig. 7 is the loose distribution situation analog result of the present embodiment shrinkage cavity, and the result shows the slab dense internal organization, without serious shrinkage cavity rarefaction defect.The generous slab exemplar of Fig. 8 for adopting the present invention to produce.
The generous slab of 60t that the present embodiment adopts the present invention to produce, inner without the shrinkage cavity rarefaction defect, the steel plate that thickness is 100mm is produced without casting crack in the surface behind mill milling, and performance satisfies instructions for use, as shown in Figure 9.
The course of work of the present invention and result:
Because the present invention adopts the automatic casting car to pour into a mould, and adopts simultaneously up-small and down-big ingot mould, implement hot shake-out technique, realized semicontinuous cast, improved production efficiency.
The present invention adopts stable filling type running gate system and two above ingates; adopt simultaneously the sieve mode of spreading to add thermal-insulating covering agent, and between steel ladle sliding water gap and feed trumpet, molten metal is implemented protection, prevented the molten metal oxidation; ensured and filled type stability, be conducive to improve the slab degree of purity.
The present invention adopts the double-layer heat insulation rising head, and implements hot shake-out and insulation retarded cooling process, be conducive in the generous Solidification Process in Continuous Slab Casting liquid feeding and from feeding, eliminated the internal shrinkage rarefaction defect, ensured slab quality.
Claims (12)
1. a wide and heavy plate mill efficiently prepares frock with generous slab, it is characterized in that: this fabricating tools is provided with running gate system, chassis, ingot mould, insulated feeder, transport trolley, stay-warm case, burial pit and temperature measuring equipment, and concrete structure is as follows:
Transport trolley is established in orbit, and the chassis is fixed on the load carrying platform of transport trolley; Build the running gate system that refractory brick forms by laying bricks or stones on the chassis, running gate system adopts bottom filling stable filling type running gate system, and sprue is up big and down small, adopts the brick one-tenth of shaping feed trumpet; Cross gate adopts the equal diameter structure, and the cross gate tail end arranges slag trap; Adopt two above ingates, reduce one by one with the increase ingate diameter of distance sprue distance; Ingot mould adopts the square ingot mould of up-small and down-big back draught, up and down consistency of thickness; Ingot mould, feed trumpet all are assemblied on the chassis, and thick chassis is adopted on the chassis; Rising head is assemblied on the ingot mould, adopts insulated feeder; A whole set of heavy slab casting mold, all assemble at transport trolley on ingot mould, gate spool, rising head, chassis, and casting process and insulating process are finished at chassis; After the strand shake out, stay-warm case is covered on the slab, the stay-warm case lower end is dropped on the chassis, keeps sealing; Steel ingot through after the insulation places the burial pit slow cooling; Temperature measuring equipment whole process using thermocouple temperature measurement system monitors slab hull-skin temperature after ingot mould surface temperature and the demoulding after the heavy slab cast.
2. efficiently prepare frock according to wide and heavy plate mill claimed in claim 1 with generous slab, it is characterized in that: running gate system adopts up big and down small sprue, the sprue back cut diameter
Lower port diameter
Feed trumpet brick thickness 30～60mm; Cross gate adopts equal diameter refractory brick tube, diameter
Cross gate tail brick is with slag trap; Ingate is directly left on cross gate vertically upward, 2～8; With the increase of distance sprue distance, the ingate diameter reduces successively, is respectively
Arrive
3. efficiently prepare frock according to wide and heavy plate mill claimed in claim 1 with generous slab, it is characterized in that: ingot mould adopts the square ingot mould of up-small and down-big back draught, ingot mould tapering 1%～5%; Ingot mould thickness 200～350mm, ingot mould adopts uniform wall thickness, and profile is consistent with inboard shape; Ingot mould hangs handle on wide facial plane, and two of every sides are hung shank diameter 300～450mm.
4. efficiently prepare frock according to wide and heavy plate mill claimed in claim 1 with generous slab, it is characterized in that: the insulated feeder tapering is 1～8%, height 300～600mm; Rising head adopts three-decker, and outer rising head case is cast iron materials, building heat-insulation brick in the rising head case, and insulating brick thickness 30～180mm, material are light weeight alumina brick or clay brick, hang warming plate, warming plate thickness 10～60mm in the insulating brick.
5. efficiently prepare frock according to wide and heavy plate mill claimed in claim 1 with generous slab, it is characterized in that: transport trolley is the special-purpose slab transport trolley of Wheeltrack structure, is the industrial railway track below the transport trolley, and transport trolley assembles heavily loaded train wheel; The transport trolley bogie structure is identical with cargo train, and the assembling load carrying platform is disk construction on the bogie.
6. efficiently prepare frock according to wide and heavy plate mill claimed in claim 1 with generous slab, it is characterized in that: stay-warm case is the heavy slab stay-warm case, the square bar shelf structure, and skin is steel plate, and intermediate course is that sial is cotton, and internal layer adopts steel wire, and fixedly sial is cotton.
7. one kind is utilized the wide and heavy plate mill of the described frock of claim 1 with the high efficiency preparation method of generous slab, it is characterized in that: transport trolley is put put in place, chassis, ingot mould, feed trumpet are fixed on the chassis, build refractory brick by laying bricks or stones; Simultaneously, rising head is carried out preheating, and the rising head after the preheating is assembled on the ingot mould; Carry out the heavy slab cast by technological requirement, after generous slab solidifies, under the condition of high temperature, carry out shake out, successively rising head and ingot mould are deviate from from slab top, with stay-warm case with on the slab cover, after insulation, utilize transport trolley that slab is transported to the burial pit place and carry out slow cooling, put at last heat-treatment furnace and carry out annealing in process.
8. according to the high efficiency preparation method of wide and heavy plate mill claimed in claim 7 with generous slab, it is characterized in that: adopt insulated feeder that generous slab is carried out the top feeding, the double-layer heat insulation rising head adopts the skin internal layer of laying bricks to hang the warming plate mode and make, skin is built by laying bricks or stones with insulating brick, and the internal layer warming plate is light heat insulation material; After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 200 ℃.
9. according to the high efficiency preparation method of wide and heavy plate mill claimed in claim 7 with generous slab, it is characterized in that: ingot mould adopts up-small and down-big form, the little 80～200mm of Width end opening width suitable for reading; Before the cast, ingot mould is cleared up, removed surperficial iron rust, then ingot mould is preheated to more than 60 ℃; To ingot mould inner chamber swabbing, thickness of coating layer is 0.2～5mm thereupon.
10. according to the high efficiency preparation method of wide and heavy plate mill claimed in claim 7 with generous slab, it is characterized in that: adopt stable filling type running gate system slowly to pour into a mould, poring rate 0.5～5.0t/min, add thermal-insulating covering agent in the casting process, addition 0.1～2.5kg/t, thermal-insulating covering agent adopt the sieve mode of spreading to add; Adopt seal closure to seal between down gate and the steel ladle sliding water gap, and in seal closure, be filled with argon gas protection.
11. according to the high efficiency preparation method of wide and heavy plate mill claimed in claim 7 with generous slab, it is characterized in that: the chassis makes each ingate evenly distributed from big to small when building refractory brick by laying bricks or stones, the refractory brick of afterbody refractory brick with slag trap; Build by laying bricks or stones finish after, the surface covers the chassis with steel plate, at the ingate place, steel plate is left and the onesize hole of ingate.
12. according to the high efficiency preparation method of wide and heavy plate mill claimed in claim 7 with generous slab, it is characterized in that: behind casting complete, when slab outer surface solidified layer thickness reaches 20～300mm, carry out hot shake-out; Open insulated feeder, the insulated feeder internal layer is adhered on the slab; Hang away ingot mould with crane, with on the red heat slab cover, make in situ upper insulation of heavy slab with stay-warm case, the steel slab surface temperature is maintained in 800～1200 ℃ of scopes, behind insulation 3～15h, utilize transport trolley that slab is transported to the burial pit place and carry out slow cooling; After below the slow cooling to 200 ℃, slab enters heat-treatment furnace and carries out annealing in process.
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| CN103008626A (en) * | 2013-01-17 | 2013-04-03 | 中国科学院金属研究所 | Method used for high-temperature liquid core mold dismantling of large-scale extra-thick plate blank |
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| CN104070145A (en) * | 2014-06-19 | 2014-10-01 | 中国科学院金属研究所 | Manufacturing tooling and efficient production method of large height-diameter ratio circular casting billet |
| CN105268884A (en) * | 2014-07-21 | 2016-01-27 | 中国科学院金属研究所 | Method for forging superhigh-temperature soft core of steel ingot |
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