CN102886501B - 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 PDF

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CN102886501B
CN102886501B CN201210380390.0A CN201210380390A CN102886501B CN 102886501 B CN102886501 B CN 102886501B CN 201210380390 A CN201210380390 A CN 201210380390A CN 102886501 B CN102886501 B CN 102886501B
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slab
ingot mould
brick
wide
adopts
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CN201210380390.0A
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CN102886501A (en
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夏立军
栾义坤
傅排先
刘宏伟
王雪东
李殿中
李依依
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中国科学院金属研究所
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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

A kind of wide and heavy plate mill is efficiently prepared frock and preparation method with generous slab

Technical field

The present invention relates to the generous slab of wide and heavy plate mill and manufacture field, specifically high efficiency manufacture frock and the method for generous slab for a kind of wide and heavy plate mill.

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, slab that can be more than rolling 500mm.China also started to build 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 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 Wide and Thick Slab quality, be difficult to only according to mill milling, must improve rolling Wide and Thick Slab generous slab quality used, 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, carry out generous slab manufacture.First be to adopt electroslag remelting mode to manufacture generous slab, fact proved, generous slab quality is improved, but production efficiency is lower, and the generous slab of one 60 tons heavy needs just can complete for more than 30 hour.In addition, some enterprises adopt water-cooled die casting method to produce, and owing to there is the problems such as crackle, effect is also undesirable.Some enterprises manufacture generous slab with the large-scale round ingot of die casting by hydraulic press cogging, hydraulic press cogging expense 3000 yuan of left and right per ton, and cost is high, and is difficult to realize production in enormous quantities.

Summary of the invention

The object of the present invention is to provide the generous slab of a kind of wide and heavy plate mill efficiently to prepare frock and preparation method, 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 is efficiently prepared 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 chassis is fixed on the load carrying platform of transport trolley; On chassis, build the running gate system that refractory brick forms by laying bricks or stones, 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 equal diameter structure, and cross gate tail end arranges slag trap; Adopt more than two ingate, reduce one by one with the increase ingate diameter apart from sprue distance; Ingot mould adopts the square ingot mould of up-small and down-big back draught, upper and lower consistency of thickness; Ingot mould, feed trumpet are all assemblied on chassis, and chassis adopts thick chassis; Rising head is assemblied on ingot mould, adopts insulated feeder; A whole set of heavy slab casting mold, all assemble on transport trolley on ingot mould, gate spool, rising head, chassis, and casting process and insulating process complete on chassis; After strand shake out, stay-warm case is covered on slab, stay-warm case lower end is dropped on chassis, keeps sealing; Through the steel ingot after insulation, be placed in 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 heavy slab cast.

Described wide and heavy plate mill is efficiently prepared frock with generous slab, and running gate system adopts up big and down small sprue, 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 vertically upward, is directly outputed on cross gate, 2~8; With the increase apart from sprue distance, ingate diameter reduces successively, is respectively arrive

Described wide and heavy plate mill is efficiently prepared 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 inner side shape; Ingot mould hangs handle on wide facial plane, and two of every sides, hang shank diameter 300~450mm.

Described wide and heavy plate mill is efficiently prepared frock with generous slab, and 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 rising head case, and insulating brick thickness 30~180mm, material is light weeight alumina brick or clay brick, hangs warming plate, warming plate thickness 10~60mm in insulating brick.

Described wide and heavy plate mill is efficiently prepared frock with generous slab, and transport trolley is the special slab transport trolley of Wheeltrack structure, is industrial railway track below transport trolley, and transport trolley assembles heavily loaded train wheel; Transport trolley bogie structure is identical with cargo train, and on bogie, assembling load carrying platform is disk construction.

Described wide and heavy plate mill is efficiently prepared frock with generous slab, and stay-warm case is heavy slab stay-warm case, square bar shelf structure, and skin is steel plate, and intermediate course is sial cotton, and internal layer adopts the fixing sial cotton of steel wire.

Utilize the high efficiency preparation method of generous slab for the wide and heavy plate mill of described frock, transport trolley is put and put in place, chassis, ingot mould, feed trumpet are fixed on chassis, build refractory brick by laying bricks or stones; Meanwhile, rising head is carried out to preheating, and the rising head after preheating is assembled on ingot mould; Carry out 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 by slab cover, after insulation, utilize transport trolley that slab is transported to burial pit place and carry out slow cooling, finally put into heat-treatment furnace and carry out annealing in process.

The high efficiency preparation method of generous slab for described wide and heavy plate mill, adopt insulated feeder to carry out top feeding to generous slab, double-layer heat insulation rising head adopts the skin internal layer of laying bricks to hang warming plate mode and manufacture, and outerly builds by laying bricks or stones with insulating brick, and internal layer warming plate is light heat insulation material; After rising head has been built by laying bricks or stones, carry out preheating, preheat temperature is not less than 200 ℃.

The high efficiency preparation method of generous slab for described wide and heavy plate mill, ingot mould adopts up-small and down-big form, and width suitable for reading is than the little 80~200mm of end opening width; Before 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.

The high efficiency preparation method of generous slab for described wide and heavy plate mill, 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 casting process, addition 0.1~2.5kg/t, thermal-insulating covering agent adopts the sieve mode of spreading to add; Between down gate and steel ladle sliding water gap, adopt seal closure to seal, and be filled with argon gas protection in seal closure.

The high efficiency preparation method of generous slab for described wide and heavy plate mill, chassis, in the time building refractory brick by laying bricks or stones, makes each ingate evenly distributed from big to small, the refractory brick of afterbody refractory brick with slag trap; After having built by laying bricks or stones, surface covers chassis with steel plate upper, and at ingate place, steel plate is outputed and the onesize hole of ingate.

The high efficiency preparation method of generous slab for described wide and heavy plate mill, when after casting complete, when slab outer surface solidified layer thickness reaches 20~300mm, carries out hot shake-out; Open insulated feeder, insulated feeder internal layer is adhered on slab; Hang away ingot mould with crane, by on red heat slab cover, make heavy slab upper insulation in situ with stay-warm case, in stay-warm case insulating process, make steel slab surface temperature maintain within the scope of 800~1200 ℃, after insulation 3~15h, utilize transport trolley that slab is transported to burial pit place and carry out slow cooling; After slow cooling to 200 ℃ is following, 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 slab Quick-forming, production efficiency is high.

2. the present invention has adopted special stable filling type running gate system, has designed special sprue, cross gate, ingate, makes in casting process molten steel forming steady, has reduced secondary oxidation and has been mingled with and rolls up the defects such as gas, has improved slab quality.

3. adopted rational Insulation, given full play to slab from feeding capacity, make metal in insulating process, completed from outside to inside from feeding, overcome slab crackle, the defect such as loose; Adopt rational Technology for Heating Processing, make slab microstructure homogenization, improve slab serviceability.

4. the present invention is applicable to the manufacture of the generous slab of various models and specification.Utilize the generous slab that the present invention produces to carry out Plate rolling, can improve plate property, reduce costs, 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, once 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 that the heavy slab of 20~70 tons is produced.

In a word, the present invention adopts stable filling type running gate system, design Novel ingot mold, carry out hot shake-out, given full play to slab from feeding capacity, reduced slab secondary oxidation tendency, shrinkage cavity, rarefaction defect are eliminated, improved slab production efficiency and slab quality, heavy slab is produced in a large number, meeting domestic many Wide and Thick Slab steel rolling production-line demands becomes possibility.

Accompanying drawing explanation

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.In figure, 1-transport trolley, 2-chassis, 3-feed trumpet, 4-ingot mould, 5-insulated feeder, 6-stay-warm case.

Fig. 2 is transport trolley schematic diagram.21-track, 22-wheel, 23-bogie, 24-load carrying platform.

Fig. 3 is heavy slab formation system assembling schematic diagram.In figure, 31-sprue funnel brick, 32-sprue cast tube brick, 33-sprue angle brick, 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.In figure, 41-steel plate, 42-sial cotton, 43-steel wire, 44-hanger.

Fig. 5 is flow field simulation result figure in cavity filling process.

Fig. 6 is temperature field simulation result figure in process of setting.

Fig. 7 is shrinkage cavity, loose distribution simulation result figure.

Fig. 8 is the generous slab exemplar that adopts the present invention to produce.

Fig. 9 is the steel plate that adopts the present invention to produce.

The specific embodiment

As 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:

Transport trolley 1 is established in orbit, and chassis 2 is fixed on the load carrying platform of transport trolley; On chassis 2, build the running gate system that refractory brick forms by laying bricks or stones, running gate system adopts bottom filling stable filling type running gate system, adopts the brick one-tenth of shaping feed trumpet; Cross gate adopts equal diameter structure, and cross gate tail end arranges slag trap; Adopt more than two ingate, reduce one by one with the increase ingate diameter apart from sprue distance; Large mouthful of ingot mould 4 downwards, osculum upwards, upper and lower consistency of thickness, ingot mould 4 hangs handle in large plane, is convenient to repair a die, and hangs two of the every sides of handle, diameter 300~450mm.Ingot mould 4, feed trumpet 3 are all assemblied on chassis 2, and chassis adopts thick chassis; Rising head is assemblied on ingot mould, adopts insulated feeder 5; A whole set of heavy slab casting mold, all assemble on transport trolley on ingot mould, gate spool, rising head, chassis, and casting process and insulating process also complete on chassis.Stay-warm case 6 is mainly used in the insulation after slab shake out, after strand shake out, stay-warm case is covered on slab, and lower end is dropped on chassis, keeps sealing.

In running gate system, sprue is up big and down small, 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 vertically upward, is directly outputed on cross gate, 2~8; With the increase apart from sprue distance, ingate diameter reduces successively, is respectively arrive

Ingot mould 4 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 inner side shape; Ingot mould hangs handle on wide facial plane, and two of every sides, hang shank diameter 300~450mm.In the present invention, ingot mould is cast iron materials (as: HT200).

Before cast, ingot mould, running gate system, chassis are assembled on cast chassis, insulated feeder is preheated to more than 200 ℃.Adopt slow pouring type to pour into a mould, after cast, adopt high temperature stripping means to carry out the demoulding, after cast, remove after feed trumpet 3, ingot mould 4 and insulated feeder 5, utilize stay-warm case 6 to be incubated steel ingot; After insulation, then transport with chassis, hang in burial pit (melt pit) and carry out slow cooling.Finally, generous slab cuts rising head, removes burr, puts into heat-treatment furnace and carries out annealing in process.Casting complete is to entering in furnace annealing process, and whole process using thermocouple temperature measurement system detects ingot mould and casting blank surface temperature, to determine heavy slab curdled appearance.

As shown in Figure 2, transport trolley system mainly comprises: track 21, wheel 22, bogie 23, load carrying platform 24, and concrete structure is as follows:

Track 21 is heavy-duty steel rail, and roadbed is pressed heavy-duty steel rail roadbed and laid; Coordinating the wheel 22 of walking with track 21 is railway freight-car heavy-duty wheel, and axle weighs more than 100 tons; The bogie 23 of installing on wheel 22 is heavy-duty freight car bogie, and a complete set is steel construction bogie; The load carrying platform at transport trolley system top is welded steel structure, and design weight capacity is more than 200 tons.

As shown in Figure 3, 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:

Sprue funnel brick 31, sprue injecting pipe brick 32, sprue angle brick 33 are arranged at feed trumpet, sprue funnel brick 31 is on sprue top, be followed successively by sprue injecting pipe brick 32 below, sprue injecting pipe brick 32 need to use polylith, determine injecting pipe brick use amount according to sprue height, sprue injecting pipe brick 32 joins with sprue angle brick 33 below, and in all feed trumpets, refractory brick is all fixed with sand, between refractory brick and feed trumpet swage, tamps with sand; The straight-through brick 34 of cross gate joins with sprue angle brick 33, arrange as required the quantity of the straight-through brick 34 of cross gate, on the straight-through brick 34 of cross gate, connect ingate brick 35 simultaneously, equally as required, select ingate (fire-resistant) brick 35 of different-diameter, make each ingate evenly distributed from big to small, select the refractory brick of collection sand bag brick 36(with slag trap at cross gate end refractory brick).After having built by laying bricks or stones, surface covers chassis with 0.5mm steel plate upper, improves die cavity cleanliness factor, outputs and the onesize hole of ingate, so that molten steel flows into die cavity smoothly at ingate place.

Insulated feeder is made up of insulated feeder case 37, insulating brick 38, warming plate 39, insulating brick 38 and warming plate 39 are arranged in insulated feeder case 37, the interior extension warming plate 39 of insulating brick 38, outer layer insulating brick 38 is clay brick, thermal conductivity factor 0.2~the 2.0W/mK of insulating brick, make rising head there is 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.When shake out, internal layer warming plate sticks on slab, can not reuse; Wherein: insulated feeder case 37 play supporting role, 38 insulation effects of insulating brick play supporting role to warming plate 39 above simultaneously, the main insulation effect that rises of warming plate 39.First insulating brick 38 is built in insulated feeder case 37 by shape dress, inner surface is as far as possible smooth, again warming plate 39 is fixed on to insulating brick 38 inner sides, outer insulated feeder case 37 is cast iron materials (as: HT200), insulating brick completes with masonry way, be combined closely with rising head case, insulating brick intensity is enough high, can reuse.Warming plate thermal conductivity factor is low, good heat-insulation effect, but intensity is lower, in the time of shake out, between warming plate and insulating brick, staggers, and warming plate is stayed on the slab of red heat, has continued insulation effect.After rising head has been built by laying bricks or stones, carry out preheating, preheat temperature is not less than 200 ℃.

As 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 is efficiently prepared frock comprises:

First carry out mould assembling, transport trolley 1 is located on track 21, chassis 2 is fixed on the load carrying platform 24 of transport trolley 1; On chassis 2, build refractory brick by laying bricks or stones, feed trumpet 3 is fixed on chassis 2, and in feed trumpet 3, feed trumpet brick is installed; Ingot mould 4 is installed on chassis, large mouthful of ingot mould 4 downwards, osculum upwards; Insulated feeder 5 is installed on ingot mould 4; Next is poured into a mould, and in casting process, adopts argon for protecting pouring; after ladle tapping slide gate nozzle is aimed at sprue; 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 molten steel oxidation.Meanwhile, adopt slow pouring type to pour into a mould, alleviate molten metal splash; Finally, molten metal solidified after a period of time, carried out shake out (demoulding), insulation under the condition of high temperature, sent burial pit slow cooling; Then, put into heat-treatment furnace and carry out homogenizing annealing processing.

Profit is poured into a mould generous slab in this way, can pour into a mould polylith slab simultaneously, and early, efficiency is high for shake out time; Adopt argon shield, stable filling type running gate system and slow pouring technology, can reduce oxidation, minimizing is mingled with; Hot shake-out, insulation, can make full use of slab waste heat and make slab Slow cooling in burial pit online, has solved the problems such as slab shrinkage cavity, loose, crackle, has produced qualified generous slab; Generous slab finally obtains through heavy and medium plate mill rolling the steel plate that thickness is greater than 20mm, dense structure, and flaw detection reaches 2 grades of levels of GB/T2970.

In 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 running gate system used, application number 200310105217.0.

The present invention is generous, and 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.The degree of purity that guarantees Wide and Thick Slab, minimizing is mingled with, and need to carry out sublimate smelting, 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; After 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 cast starts, while seeing bright metal liquid level, started to add.In casting process, add thermal-insulating covering agent, addition 0.1~2.5kg/t.In whole casting process, coverture covers liquid level always, makes liquid level all be in the protection of coverture, there is no dew point.

2, the generous slab shrinkage cavity that prepared by traditional handicraft method, loose serious, defect 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 inner side arranges insulating brick, and warming plate is pasted in insulating brick inner side, increases the feeding capacity of rising head, can effectively increase the utilization rate of rising head, reduces by a shrinkage cavity.Meanwhile, adopt hot shake-out technique, give full play to metal from feeding capacity, reduce rarefaction defect.

3, generous slab is efficiently prepared.Adopt hot shake-out technique, mould is fully used; Adopt 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.

As shown in Figure 1, Figure 2, Figure 3 shows, the efficient preparation technology of generous slab is as follows:

As seen from Figure 1, chassis 2 is fixed on 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 chassis 2, running gate system and slab die cavity are successfully linked together, insulated feeder 5 drops on ingot mould 4, makes insulated feeder give full play to feeding effect.

As seen from Figure 2, transport trolley 1 belongs to heavily loaded chassis, all has track at stations such as cast, shake out, insulation, slow cooling, 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, in the time running into ingate brick 35, molten steel has an opportunity to enter die cavity again, but in fact molten steel is first full of cross gate, directly enter slag trap brick 36, then return to make liquid level in cross gate to raise, molten steel starts to enter die cavity from ingate 35.After molten steel enters into ingot mould 4, start steadily to rise, add covering slag, prevent metal bath surface oxidation.In the time that molten steel enters into insulated feeder 5, control cast height, add thermal-insulating covering agent, casting complete.

4, efficiently prepare the main technologic parameters of generous slab: (1) has completed Design of Runner System by computer simulation, key design ingate size and number, vertically upward, ingate quantity is 2~8 to ingate, 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 higher than liquidus temperature more than 30 ℃.(3) adopt hot shake-out technique, after cast, solidify certain hour shake out, shake out time is determined according to simulation setting time.As shown in Figure 5, the temperature field of generous Solidification Process in Continuous Slab Casting.Determine setting time, shake out when the thick 50~300mm of slab solidified shell by the temperature field of calculating foundry goods; First hang rising head case, hang away ingot mould, with stay-warm case, by slab cover, controlling slab surface temperature is 800~1200 ℃.(4) after insulation 3~15h, be transported to burial pit and carry out slow cooling.Below slow cooling to 200 ℃, then enter heat treatment kiln, carry out homogenizing annealing processing, furnace temperature is consistent with casting temperature, and the temperature difference is no more than 100 ℃, and enters after heat-treatment furnace at slab, first carries out samming, after temperature is in full accord, then heats up.In the present invention, homogenizing annealing heat treatment temperature is 900~1120 ℃, and temperature retention time is 4~12h, cooling with stove.

As shown in Figure 1, the present invention, according to pouring technology requirement, has determined poring rate, the duration of pouring, requires design insulated feeder according to feeding, simultaneously according to being incubated requirement after 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 feeding requirement, design double-layer heat insulation rising head, double-layer heat insulation rising head adopts building heat-insulation brick to complete with the mode that interpolation warming plate combines, in insulated feeder casing, with light-weight brick building heat insulation lining, the inside is mended one layer of heat preservation plate again, forms double-layer heat insulation rising head, rising head tapering is that 1~8%(insulated feeder internal diameter is up-small and down-big), be highly 300~600mm.

Warming plate thickness 10~60mm, R200mm circular arc is made at inner corner place.Insulating brick thickness 30~180mm, material is light weeight alumina brick.After rising head has been built by laying bricks or stones, carry out preheating, preheat temperature is not less than 200 ℃.

3) ingot mould: ingot mould is rectangle, adopts cast iron HT200 material, thickness 200~350mm, and tapering is 1~5%.Convenient for shake out (demoulding), adopt up-small and down-big form, upper young, be conducive to hot shake-out, width suitable for reading is than the narrow 80~200mm of end opening width.Before 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.

In 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: slab stay-warm case is heavy slab stay-warm case, square bar shelf structure, skin is steel plate, thick 3~5mm, intermediate course is sial cotton, thick 20~50mm, internal layer is steel wire, fixing sial cotton.Steel plate inner side is provided with column, steel wire is firmly connected with outer layer plate, and intermediate layer sial cotton is played the role of positioning.Hanging apparatus is installed in 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, to can set level in transportation.After slab shake out, stay-warm case is covered on red heat slab rapidly, stay-warm case lower end is dropped on chassis, keeps sealing below, reduces heat loss.

5) transport trolley: transport trolley is the special slab transport trolley of Wheeltrack structure, is industrial railway track below transport trolley, and transport trolley assembles heavily loaded train wheel.On transport trolley wheel, assemble heavy-duty freight car bogie, assemble load carrying platform on bogie, load carrying platform is welded steel structure.Transport trolley bogie structure is identical with cargo train, above load carrying platform be disk construction.Transport trolley design load is 200t(ton), track structure is heavy structure, wheel, bogie, carrying platform design weight capacity are more than 200 tons.Transport trolley both sides assembling lorry docking hook, can advance the interlock between release and each chassis with engine.

Below in conjunction with drawings and Examples in detail the present invention is described in detail.

Embodiment 1

The slab weight that the present embodiment adopts the present invention to produce is 40t, and concrete technology parameter is as follows:

Sprue back cut diameter lower port diameter feed trumpet brick thickness 35mm; Cross gate internal diameter adopt 3 ingates, with apart from the reducing of feed trumpet distance, ingate diameter is followed successively by 30mm, 40mm and 50mm.Ingot mould tapering is 2%, ingot mould thickness 300mm.Adopt double-layer heat insulation rising head, riser height 300mm, rising head tapering is 2%, and riser head heat-preserving brick adopts light weeight alumina brick, and thickness is 80mm, and riser head heat-preserving plate thickness is 15mm; Before use, rising head preheat temperature is 300 ℃.

80 ℃ of ingot mould preheat temperatures, the zircon flour coating that internal spray 1mm is thick.Chassis is placed on 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 mode on the metal bath surface in ingot mould and thermal-insulating covering agent in casting process, and addition is 0.2kg/t.

Cast finishes rear 1h, and slab outer surface solidified layer thickness carries out hot shake-out more than reaching 100mm.First slough rising head, then slough ingot mould, adopting thermocouple temperature measurement system to detect slab surface temperature is 1050 ℃, with covering on by stay-warm case on strand, strand is implemented to insulation, monitors casting blank surface temperature in insulating process.After 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, stress relief annealing heat treatment temperature is 600 ℃, and temperature retention time is 15h, cooling with stove.

The generous slab of 40t that the present embodiment adopts the present invention to produce, inner without shrinkage cavity rarefaction defect, the steel plate that thickness is 150mm, without casting crack, is produced in surface after mill milling, and performance meets instructions for use.

Embodiment 2

The slab weight that the present embodiment adopts the present invention to produce is 60t, and size of plate blank is 1000 × 2700 × 3300mm.Concrete technology parameter is as follows:

Sprue back cut diameter lower port diameter feed trumpet brick thickness 50mm; Cross gate internal diameter adopt 4 ingates, with apart from the reducing of feed trumpet distance, ingate diameter is followed successively by 30mm, 45mm, 60mm and 75mm.Ingot mould tapering is 4%, ingot mould thickness 350mm.Adopt double-layer heat insulation rising head, riser height 500mm, rising head tapering is 4%, and riser head heat-preserving brick adopts light weeight alumina brick, and thickness is 120mm, and riser head heat-preserving plate thickness is 40mm; Before use, rising head preheat temperature is 300 ℃.

100 ℃ of ingot mould preheat temperatures, the zircon flour coating that internal spray 2mm is thick.Chassis is placed on 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 mode on the metal bath surface in ingot mould and thermal-insulating covering agent in casting process, and addition is 1.0kg/t.

Cast finishes rear 1.5h, and slab outer surface solidified layer thickness carries out hot shake-out more than reaching 150mm.First slough rising head, then slough ingot mould, adopting thermocouple temperature measurement system to detect slab surface temperature is 1100 ℃, with covering on by stay-warm case on strand, strand is implemented to insulation, monitors casting blank surface temperature in insulating process.After 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, stress relief annealing heat treatment temperature is 500 ℃, and temperature retention time is 5h, cooling with stove.

The generous slab of 60t that the present embodiment adopts the present invention to produce, inner without shrinkage cavity rarefaction defect, the steel plate that thickness is 200mm, without casting crack, is produced in surface after mill milling, and performance meets instructions for use.

Fig. 5 is the flow field simulation result of the generous slab casting process of the present embodiment, adopts as seen stable filling type running gate system and the structure of more than two ingate has guaranteed the stationarity in 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 result shows slab dense internal organization, without serious shrinkage cavity rarefaction defect.Fig. 8 is the generous slab exemplar that adopts the present invention to produce.

The generous slab of 60t that the present embodiment adopts the present invention to produce, inner without shrinkage cavity rarefaction defect, the steel plate that thickness is 100mm, without casting crack, is produced in surface after mill milling, and performance meets instructions for use, as shown in Figure 9.

The course of work of the present invention and result:

Pour into a mould because the present invention adopts automatic casting car, adopt up-small and down-big ingot mould simultaneously, implement hot shake-out technique, realized semicontinuous cast, improved production efficiency.

The present invention adopts stable filling type running gate system and more than two ingate; adopt the sieve mode of spreading to add thermal-insulating covering agent simultaneously, and between steel ladle sliding water gap and feed trumpet, molten metal is implemented to protection, prevented molten metal oxidation; ensure and filled type stability, be conducive to improve slab degree of purity.

The present invention adopts double-layer heat insulation rising head, and implements hot shake-out and insulation retarded cooling process, is conducive to liquid feeding in generous Solidification Process in Continuous Slab Casting and from feeding, has eliminated internal shrinkage rarefaction defect, has ensured slab quality.

Claims (12)

1. wide and heavy plate mill is efficiently prepared a frock with generous slab, it is characterized in that: this is prepared frock and 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 chassis is fixed on the load carrying platform of transport trolley; On chassis, build the running gate system that refractory brick forms by laying bricks or stones, 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 equal diameter structure, and cross gate tail end arranges slag trap; Adopt more than two ingate, reduce one by one with the increase ingate diameter apart from sprue distance; Ingot mould adopts the square ingot mould of up-small and down-big back draught, upper and lower consistency of thickness; Ingot mould, feed trumpet are all assemblied on chassis, and chassis adopts thick chassis; Rising head is assemblied on ingot mould, adopts insulated feeder; A whole set of heavy slab casting mold, all assemble on transport trolley on ingot mould, gate spool, rising head, chassis, and casting process and insulating process complete on chassis; After strand shake out, stay-warm case is covered on slab, stay-warm case lower end is dropped on chassis, keeps sealing; Through the steel ingot after insulation, be placed in 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 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, sprue back cut diameter 100~130mm, lower port diameter 50~80mm, feed trumpet brick thickness 30~60mm; Cross gate adopts equal diameter refractory brick tube, diameter 50~80mm, and cross gate tail brick is with slag trap; Ingate vertically upward, is directly outputed on cross gate, 2~8; With the increase apart from sprue distance, ingate diameter reduces successively, is respectively 80mm to 30mm.
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 inner side shape; Ingot mould hangs handle on wide facial plane, and two of every sides, hang 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: 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 rising head case, and insulating brick thickness 30~180mm, material is light weeight alumina brick or clay brick, hangs warming plate, warming plate thickness 10~60mm in insulating brick.
5. efficiently preparing 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 slab transport trolley of Wheeltrack structure, is industrial railway track below transport trolley, and transport trolley assembles heavily loaded train wheel; Transport trolley bogie structure is identical with cargo train, and on bogie, assembling load carrying platform is disk construction.
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 heavy slab stay-warm case, square bar shelf structure, skin is steel plate, and intermediate course is sial cotton, and internal layer adopts the fixing sial cotton of steel wire.
7. a high efficiency preparation method that utilizes the generous slab of wide and heavy plate mill of frock described in claim 1, is characterized in that: transport trolley is put and put in place, chassis, ingot mould, feed trumpet are fixed on chassis, build refractory brick by laying bricks or stones; Meanwhile, rising head is carried out to preheating, and the rising head after preheating is assembled on ingot mould; Carry out 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 by slab cover, after insulation, utilize transport trolley that slab is transported to burial pit place and carry out slow cooling, finally put into heat-treatment furnace and carry out annealing in process.
8. the high efficiency preparation method with generous slab according to wide and heavy plate mill claimed in claim 7, it is characterized in that: adopt insulated feeder to carry out top feeding to generous slab, double-layer heat insulation rising head adopts the skin internal layer of laying bricks to hang warming plate mode and manufacture, skin is built by laying bricks or stones with insulating brick, and internal layer warming plate is light heat insulation material; After rising head has been built by laying bricks or stones, carry out preheating, preheat temperature is not less than 200 ℃.
9. the high efficiency preparation method with generous slab according to wide and heavy plate mill claimed in claim 7, is characterized in that: ingot mould adopts up-small and down-big form, width suitable for reading is than the little 80~200mm of end opening width; Before 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. the high efficiency preparation method with generous slab according to wide and heavy plate mill claimed in claim 7, 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, in casting process, add thermal-insulating covering agent, addition 0.1~2.5kg/t, thermal-insulating covering agent adopts the sieve mode of spreading to add; Between down gate and steel ladle sliding water gap, adopt seal closure to seal, and be filled with argon gas protection in seal closure.
11. according to wide and heavy plate mill claimed in claim 7 the high efficiency preparation method with generous slab, it is characterized in that: chassis, in the time building refractory brick by laying bricks or stones, makes each ingate evenly distributed from big to small, the refractory brick of afterbody refractory brick with slag trap; After having built by laying bricks or stones, surface covers chassis with steel plate upper, and at ingate place, steel plate is outputed and the onesize hole of ingate.
12. according to wide and heavy plate mill claimed in claim 7 the high efficiency preparation method with generous slab, it is characterized in that: when after casting complete, when slab outer surface solidified layer thickness reaches 20~300mm, carry out hot shake-out; Open insulated feeder, insulated feeder internal layer is adhered on slab; Hang away ingot mould with crane, by on red heat slab cover, make heavy slab upper insulation in situ with stay-warm case, in stay-warm case insulating process, make steel slab surface temperature maintain within the scope of 800~1200 ℃, after insulation 3~15h, utilize transport trolley that slab is transported to burial pit place and carry out slow cooling; After slow cooling to 200 ℃ is following, slab enters heat-treatment furnace and carries out annealing in process.
CN201210380390.0A 2012-10-09 2012-10-09 Tooling for efficiently manufacturing wide thick plate blank for wide thick plate rolling machine and manufacture method thereof CN102886501B (en)

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