CN102806322B - Device and method for preparing large-size homogeneous steel ingot by stirring with self-consuming stirrer - Google Patents

Device and method for preparing large-size homogeneous steel ingot by stirring with self-consuming stirrer Download PDF

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CN102806322B
CN102806322B CN201210295047.6A CN201210295047A CN102806322B CN 102806322 B CN102806322 B CN 102806322B CN 201210295047 A CN201210295047 A CN 201210295047A CN 102806322 B CN102806322 B CN 102806322B
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ingot
self
agitator
self comsuming
steel ingot
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CN102806322A (en
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李宝宽
刘鹏
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Northeastern University China
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Northeastern University China
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Abstract

The invention discloses a device and method for preparing a large-size homogeneous steel ingot by stirring with a self-consuming stirrer. The device comprises a steel ingot mould, a chassis, a self-consuming stirrer, a lifting cross arm, an electric control device and a heat-insulating riser, wherein the lifting cross arm is connected with an upright rod which is arranged on one side of an operating platform, the electric control device is fixed on the lifting cross arm and connected with the self-consuming stirrer, the heat-insulating riser is arranged above the steel ingot mould, the self-consuming stirrer comprises a stirring shaft and stirring blades, the self-consuming stirrer consumes continuously during the stirring process, one end of the lifting cross arm is a sliding end, and the sliding end can move up and down along the upright rod. The self-consuming stirrer as a cold source can increase the cooling and heat-transfer speed of the steel ingot and shorten the curing time of the steel ingot. The self-consuming stirrer consumes itself to be melted during the stirring process, so as to eliminate the problems of loosening and the like. By virtue of the rotation of the stirrer, the primary tree-like crystals at the solidified front are broken and enter the molten body to generate new crystal nuclei, so as to enhance the organization compactness and suppress segregation of metal element components.

Description

A kind of apparatus and method of stirring the large-scale homogeneous steel ingot of preparation with Self comsuming agitator
Technical field
The present invention relates to foundary industry large-scale steel ingot solidifying process technical field, be specifically related to a kind of apparatus and method of stirring the large-scale homogeneous steel ingot of preparation with Self comsuming agitator.
Background technology
Along with the fast development of power industry, nuclear industry and petro chemical industry, increasing to the demand of heavy casting and forging in recent years, simultaneously also more and more higher to the quality requirements of heavy casting and forging.Large-scale steel ingot is the product in advance of heavy casting and forging, and its quality is particularly important to improving heavy casting and forging quality.The process of setting of large-scale steel ingot is very very long, according to steel ingot tonnage difference, tens hours to up to a hundred hours are not etc., solute redistribution is abundant, cause low melting point, the low-density elements such as carbon, phosphorus in solidification front enrichment, add other physical process, as the impact of thermosolutal convection etc., make steel ingot zones of different uneven chemical components, cause gross segregation and microsegregation.Factory is for melt pit and the vacuum chamber resource-constrained of vacuum pouring large-scale steel ingot, and the low problem of its productivity ratio highlights day by day.Accelerating steel ingot cooling, suppress ingotism, is to enhance productivity, and improves the unique channel of ingot quality.
In steel ingot, the alloying element cast initial stage is uniformly distributed in molten steel, but due to alloying element different solubility in solid liquid phase, add that the molten steel Effect of Nature Convection that temperature difference causes makes alloying elements usually after the earnest district's enrichment of molten steel is separated out and moved on to by row gradually to solidification front, form gross segregation in conventional process of setting.The segregation problem of large-scale steel ingot is researcher and business circles concern extremely.Although form aspect mechanism and obtaining certain progress in segregation, as determining of segregation type, segregation position etc., aspect segregation control measure, making slow progress, almost do not have effective measures can suppress gross segregation.In decades in the production of large-scale steel ingot, factory takes to allow its naturally cooling method, only at ingot body, solidify completely and rising head adopts the method for first removing insulated feeder to boost productivity while not solidifying completely, this method, can only shift to an earlier date several hours, effect is limited compared with dozens or even hundreds of hour of large-scale steel ingot setting time.
Summary of the invention
The object of the present invention is to provide a kind of apparatus and method of stirring the large-scale homogeneous steel ingot of preparation with Self comsuming agitator, by agitator autophage, stir molten steel, acceleration steel ingot is cooling, suppresses ingotism.
Thought of the present invention is to change the type of flow of not coagulating molten steel in During Ingot Solidification, solves the alloying component macroscopic view, the microsegregation problem that in Solidification Process in Large Steel-ingot, produce.Based on Fu Laiming (M.C.Flemings, america's MIT professor) stirring that proposes solidifies the principle that suppresses solidifying segregation, the consumable agitator inserting after large-scale steel ingot casting complete is low-temperature receiver, be again the power source that drives molten steel flow, by displacement and the rotary speed of controlling Self comsuming agitator, reach the object that in process of setting, steel ingot alloying component homogenizes.
Technical scheme of the present invention is:
A device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator, comprises ingot mould and chassis, also comprises Self comsuming agitator, lifting transverse arm, electric control gear and insulated feeder;
Be positioned in the vertical rod of operating platform one side and connect lifting transverse arm, electric control gear is fixed on lifting transverse arm, and electric control gear is connected with Self comsuming agitator, and ingot mould top is also provided with insulated feeder;
Described Self comsuming agitator comprises shaft and stirring vane, and the material of agitator is identical with the large-scale homogeneous steel ingot of the finished product of finally preparing, and composition meets the requirements, and in agitation of molten steel process, Self comsuming agitator self is also in continuous consumption;
Described stirring vane is the laminated structure of thickening gradually to root of blade from vane tip, and stirring vane adopts multilayer multi-disc mode to be fixedly connected on shaft;
Described shaft is tapered from top to bottom;
One end of described lifting transverse arm is sliding end, and this sliding end inwall has some rollers, and roller drives sliding end to move up and down along vertical rod, controls Self comsuming shaft steel inlet-outlet ingot mould; This vertical rod is as the tracks of the sliding end of lifting transverse arm;
Described chassis is also fixed on operating platform, and is positioned at a side of vertical rod, and ingot mould is placed on chassis;
The size of the size of described insulated feeder and Self comsuming agitator matches, and guarantees that Self comsuming agitator can enter or shift out ingot mould by insulated feeder; Insulated feeder overcoat has heat-preservation insulating board, and heat-preservation insulating board overcoat has riser buss, and heat-preservation insulating board and the mutual jam-packed of riser buss, plays insulation effect;
Described electric control gear comprises control motor and speed reducer; Reductor is for controlling the movement velocity of shaft, and shaft is connected with speed reducer output shaft by hitch bar; Control motor and be used for controlling reductor rotation, control motor and be fixed on lifting transverse arm, the output of controlling motor connects the input of reductor.
Adopt above-mentioned Self comsuming agitating device to prepare the method for large-scale homogeneous steel ingot, comprise the steps:
Step 1: ingot mould is vacuumized and processed to prevent molten steel secondary oxidation;
Step 2: pour into a mould molten steel in ingot mould, then exothermic mixture and thermal-insulating covering agent are injected in ingot mould, cover molten steel surface and be incubated, to prevent secondary oxidation agent steel ingot shrinkage cavity and loose;
Step 3: after ingot steel casting completes, and after steel ingot formation solidified shell, control lifting transverse arm and Self comsuming agitator is put into the ingot mould that fills with molten steel from insulated feeder;
Step 4: when the distance of Self comsuming agitator lower end and ingot mould bottom is three of whole ingot mould height/for the moment, control the rotation of Electric Machine Control Self comsuming agitator and gradually on move;
The speed of Self comsuming agitator rotation is identical with molten steel free convection speed, and the speed of moving on Self comsuming agitator is identical with the speed that steel ingot is upwards solidified by its bottom;
The rotation of Self comsuming agitator can make the primary dendrite fracture of solidification front, enters in melt and forms new nucleus, and enhanced tissue compactness, suppresses metallic element component segregation phenomenon.
Step 5: while moving to the intermediate altitude of insulated feeder top and agitator lower end arrival insulated feeder on Self comsuming agitator upper end, the steel ingot in ingot mould all solidifies, and now Self comsuming agitator remainder is shifted out from ingot mould;
Step 6: wait for that steel ingot is completely cooling, complete the large-scale homogeneous steel ingot of preparation.
Beneficial effect:
In the device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator of the present invention, Self comsuming agitator itself is low-temperature receiver, can accelerate steel ingot Cooling Heat Transfer speed, shorten the ingot solidification time; The material of this agitator is identical with final finished steel ingot, and composition meets the requirements, and therefore in Self comsuming agitator whipping process, oneself consumes after fusing, is equivalent to adopt the closely knit large-scale steel ingot of qualified steel center structure, has eliminated the defects such as loose; The rotational flow that rotarily drives ingot solidification forward position molten steel of Self comsuming agitator, can make the primary dendrite fracture of solidification front, enters in melt and forms new nucleus, and enhanced tissue compactness, suppresses metallic element component segregation phenomenon.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the invention Self comsuming agitator structure schematic diagram,
Wherein, be (a) that stirring vane is the Self comsuming agitator structure schematic diagram of 3 layer of 2 chip board-type structure,
(b) be that stirring vane is the Self comsuming agitator structure schematic diagram of 3 layer of 2 oblique plate profile structure of chip,
(c) be that stirring vane is the Self comsuming agitator structure schematic diagram of 3 layer of 2 chip flexure mode structure,
(d) be that stirring vane is the Self comsuming agitator structure schematic diagram of 3 layer of 3 chip board-type structure,
(e) be that stirring vane is the Self comsuming agitator structure schematic diagram of 3 layer of 3 oblique plate profile structure of chip,
(f) be that stirring vane is the Self comsuming agitator structure schematic diagram of 3 layer of 3 chip flexure mode structure;
Fig. 2 is the Self comsuming agitating device structural representation of the specific embodiment of the invention for the preparation of large-scale homogeneous steel ingot,
Wherein, be (a) that the stirring vane of agitator is the Self comsuming agitating device structural representation of 3 layer of 2 chip board-type structure,
(b) be that the stirring vane of agitator is the Self comsuming agitating device structural representation of 3 layer of 2 oblique plate profile structure of chip,
(c) be that the stirring vane of agitator is the Self comsuming agitating device structural representation of 3 layer of 2 chip flexure mode structure,
(d) be that the stirring vane of agitator is the Self comsuming agitating device structural representation of 3 layer of 3 chip board-type structure,
(e) be that the stirring vane of agitator is the Self comsuming agitating device structural representation of 3 layer of 3 oblique plate profile structure of chip,
(f) be that the stirring vane of agitator is the Self comsuming agitating device structural representation of 3 layer of 3 chip flexure mode structure;
Wherein, 1-ingot mould, 2-riser buss, 3-insulated feeder, 4-heat-preservation insulating board, 5-chassis, 6-speed reducer output shaft, 7-ring flange, 8-shaft, 9-stirring vane, 10-thermal-insulating covering agent, 11-exothermic mixture, 12-solidified shell, 13-molten steel, 14, steel ingot, 15-reductor, 16-controls motor, 17-lifting transverse arm, 18 operating platforms, 19-vertical rod.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described further.
The device with the large-scale homogeneous steel ingot of Self comsuming agitator stirring preparation of present embodiment as shown in Figure 2, comprises ingot mould 1, Self comsuming agitator, lifting transverse arm 17, electric control gear, insulated feeder 3, riser buss 2, heat-preservation insulating board 4, chassis 5.
As shown in Figure 1, Self comsuming agitator comprises shaft 8 and stirring vane 9, and the material of Self comsuming agitator is identical with the large-scale homogeneous steel ingot of the finished product of finally preparing, and composition meets the requirements, and in agitation of molten steel process, Self comsuming agitator self is also in continuous consumption.
For guaranteeing that Self comsuming agitator is not fused in the course of the work, shaft 8 is tapered from top to bottom, the laminated structure of stirring vane 9 for thickening gradually to root of blade from vane tip, stirring vane 9 angles of inclination are that 20 ° ~ 70 ° and stirring vane 9 adopt multilayer multi-disc mode to be welded on shaft 8, and the cone angle of shaft 8 and the stirring vane 9 thickness angles of flare are 9 ° ~ 20 °; The length of shaft 8 is can enter in ingot mould 1 more than 2/3rds and rotating diameter should guarantee to pass in and out insulated feeder 3.
As shown in Fig. 1 (a) ~ (f), the stirring vane 9 of Self comsuming agitator is multilayer multiple-piece, and every layer of blade is 2 ~ 4, and stirring vane 9 can adopt 6 kinds of structures shown in Fig. 1 (a) ~ (f); The material of stirring vane 9 and consumption are determined according to the total amount of heat of prepared large-scale average steel ingot molten steel, after stirring finishes, make stirring vane 9 as far as possible all consume.
Electric control gear comprises controls motor 16 and reductor 15; Reductor 15 is for controlling the movement velocity of shaft 8, shaft 8 is connected with speed reducer output shaft 6 by hitch bar, and in the present embodiment, reductor 15 can be fixed on lifting transverse arm 17, hitch bar is ring flange 7, for connecting speed reducer output shaft 6 and shaft 8; By control motor 16, driven the rotation of reductor 15, control motor 16 is also placed on lifting transverse arm 17, the output of controlling motor 16 connects the input of reductor 15, and the elevating movement of lifting transverse arm 17 is controlled by OPS.
One end of lifting transverse arm 17 is sliding end, and sliding end inwall has 4 rollers, and sliding end is placed on the upper end of vertical rod 19, and this vertical rod 19 is as the tracks of the sliding end of lifting transverse arm 17; Vertical rod 19 is fixed on operating platform 18, chassis 5 is also fixed on operating platform 18, and be positioned at a side of vertical rod 19, ingot mould 1 is placed on chassis 5, ingot mould 1 top is provided with insulated feeder 3, the size of the size of insulated feeder 3 and Self comsuming agitator matches, and guarantees that Self comsuming agitator can enter or shift out ingot mould 1 by insulated feeder 3; Insulated feeder 3 overcoats have heat-preservation insulating board 4, and heat-preservation insulating board 4 overcoats have riser buss 2, and heat-preservation insulating board 4 and the mutual jam-packed of riser buss 2, play insulation effect.
Adopt said apparatus to prepare the method for large-scale homogeneous steel ingot, comprise the steps:
Step 1: ingot mould is vacuumized and processed to prevent molten steel secondary oxidation;
Step 2: pour into a mould molten steel in ingot mould, then exothermic mixture and thermal-insulating covering agent are injected in ingot mould, cover molten steel surface and be incubated, to prevent secondary oxidation agent steel ingot shrinkage cavity and loose;
Step 3: after ingot steel casting completes, and after the solidified shell of steel ingot formation 100mm, control lifting transverse arm and Self comsuming agitator is put into the ingot mould that fills with molten steel from insulated feeder;
Step 4: when the distance of Self comsuming agitator lower end and ingot mould bottom is three of whole ingot mould height/for the moment, control the rotation of Electric Machine Control Self comsuming agitator and gradually on move;
The speed of Self comsuming agitator rotation is identical with molten steel free convection speed, and the speed of moving on Self comsuming agitator is identical with the speed that steel ingot is upwards solidified by its bottom;
The rotation of Self comsuming agitator can make the primary dendrite fracture of solidification front, enters in melt and forms new nucleus, and enhanced tissue compactness, suppresses metallic element component segregation phenomenon.
Step 5: while moving to the intermediate altitude of insulated feeder top and agitator lower end arrival insulated feeder on Self comsuming agitator upper end, the steel ingot in ingot mould all solidifies, and now Self comsuming agitator remainder is shifted out from ingot mould;
Step 6: wait for that steel ingot is completely cooling, complete the large-scale homogeneous steel ingot of preparation.

Claims (7)

1. one kind is stirred the device of the large-scale homogeneous steel ingot of preparation with Self comsuming agitator, comprise ingot mould and chassis, chassis is fixed on operating platform, and ingot mould is placed on chassis, it is characterized in that: also comprise Self comsuming agitator, lifting transverse arm, electric control gear, insulated feeder;
Be positioned in the vertical rod of operating platform one side and connect lifting transverse arm, electric control gear is fixed on lifting transverse arm, and electric control gear is connected with Self comsuming agitator, and ingot mould top is provided with insulated feeder;
Described Self comsuming agitator comprises shaft and stirring vane, and stirring vane is fixedly connected on shaft, and the material of agitator is identical with the large-scale homogeneous steel ingot of the finished product of finally preparing, and in whipping process, Self comsuming agitator constantly consumes;
One end of described lifting transverse arm is sliding end, and this sliding end inwall has some rollers, and roller drives sliding end to move up and down along vertical rod, controls Self comsuming shaft steel inlet-outlet ingot mould;
Described electric control gear comprises control motor and speed reducer;
Described shaft is connected with speed reducer output shaft by hitch bar; Control motor and be fixed on lifting transverse arm, the output of controlling motor connects the input of reductor.
2. the device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator according to claim 1, is characterized in that: described insulated feeder overcoat has heat-preservation insulating board, and heat-preservation insulating board overcoat has riser buss, and heat-preservation insulating board and the mutual jam-packed of riser buss.
3. the device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator according to claim 1, is characterized in that: described shaft is tapered from top to bottom.
4. the device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator according to claim 1, is characterized in that: described stirring vane adopts multilayer multi-disc mode to be fixedly connected on shaft.
5. the device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator according to claim 1, is characterized in that: described stirring vane is the laminated structure of thickening gradually to root of blade from vane tip.
6. the device that stirs the large-scale homogeneous steel ingot of preparation with Self comsuming agitator according to claim 1, it is characterized in that: the size of the size of described insulated feeder and Self comsuming agitator matches, make Self comsuming agitator enter or to shift out ingot mould by insulated feeder.
7. adopt method of stirring the device of the large-scale homogeneous steel ingot of preparation with Self comsuming agitator claimed in claim 1, it is characterized in that: comprise the steps:
Step 1: ingot mould is vacuumized and processed to prevent molten steel secondary oxidation;
Step 2: pour into a mould molten steel in ingot mould, then exothermic mixture and thermal-insulating covering agent are injected in ingot mould, cover molten steel surface and be incubated, to prevent secondary oxidation and steel ingot shrinkage cavity and loose;
Step 3: after ingot steel casting completes, and after steel ingot formation solidified shell, control lifting transverse arm and Self comsuming agitator is put into the ingot mould that fills with molten steel from insulated feeder;
Step 4: when the distance of Self comsuming agitator lower end and ingot mould bottom is three of whole ingot mould height/for the moment, control the rotation of Electric Machine Control Self comsuming agitator and gradually on move;
The speed of Self comsuming agitator rotation is identical with molten steel free convection speed, and the speed of moving on Self comsuming agitator is identical with the speed that steel ingot is upwards solidified by its bottom;
Step 5: while moving to the intermediate altitude of insulated feeder top and agitator lower end arrival insulated feeder on Self comsuming agitator upper end, the steel ingot in ingot mould all solidifies, and now Self comsuming agitator remainder is shifted out from ingot mould;
Step 6: wait for that steel ingot is completely cooling, complete the large-scale homogeneous steel ingot of preparation.
CN201210295047.6A 2012-08-20 2012-08-20 Device and method for preparing large-size homogeneous steel ingot by stirring with self-consuming stirrer Active CN102806322B (en)

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CN103436709B (en) * 2013-08-27 2014-10-01 东北大学 Device and method for preparing electroslag remelting ingot employing tubular electrode additional consumable blender
CN103555877A (en) * 2013-11-18 2014-02-05 龙南龙钇重稀土科技股份有限公司 Salt-containing nodulizing agent preparation device
CN104525024B (en) * 2015-01-23 2017-08-15 无锡华能表面处理有限公司 Rabbling mechanism is lifted for glue station
CN109047685B (en) * 2018-09-07 2020-06-02 乌克兰国家科学院E.O.巴顿电焊接研究所 Method for preparing steel ingot

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CN1676237A (en) * 2005-04-05 2005-10-05 北京交通大学 Vacuum mechanical dual-stirring casting method for preparing granule reinforced aluminium-base composite material
CN101956089A (en) * 2009-07-13 2011-01-26 淄博宏泰防腐有限公司 Method for improving slag inclusion inside magnesium alloy ingot
CN102161081A (en) * 2011-04-01 2011-08-24 天津福来明思铝业有限公司 Continuous casting method for producing aluminium alloy semisolid casting ingot

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CN1296868A (en) * 2000-11-21 2001-05-30 白荣铠 Casting technology and apparatus for producing die-cast ingot, castings and conticast billet
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CN102161081A (en) * 2011-04-01 2011-08-24 天津福来明思铝业有限公司 Continuous casting method for producing aluminium alloy semisolid casting ingot

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