CN102806322A - 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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Publication number
CN102806322A
CN102806322A CN2012102950476A CN201210295047A CN102806322A CN 102806322 A CN102806322 A CN 102806322A CN 2012102950476 A CN2012102950476 A CN 2012102950476A CN 201210295047 A CN201210295047 A CN 201210295047A CN 102806322 A CN102806322 A CN 102806322A
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ingot
formula agitator
consumable formula
steel ingot
stirring
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CN2012102950476A
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CN102806322B (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 consumable formula 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 consumable formula agitator.
Background technology
Along with the fast development of power industry, nuclear industry and petro chemical industry, increasing in recent years, simultaneously also increasingly high to the quality requirements of heavy casting and forging to the demand 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 the heavy casting and forging quality.The process of setting of large-scale steel ingot is very very long, and is different according to the steel ingot tonnage, do not wait in tens hours to up to a hundred hours; The solute reallocation fully; Cause low melting point, low-density elements such as carbon, phosphorus in the solidification front enrichment, add other physical process, like the influence of thermosolutal convection etc.; Make steel ingot zones of different uneven chemical components, cause gross segregation and microsegregation.Factory is used for the 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 the steel ingot cooling, suppress ingotism, is to enhance productivity, and improves the unique channel of ingot quality.
The alloying element cast initial stage is uniformly distributed in the molten steel in the steel ingot; But in conventional process of setting since alloying element solid-liquid mutually in different solubility, add that molten steel free convection effect that temperature difference causes makes alloying elements usually separate out and moved on to by row gradually that molten steel is earnest forms gross segregation after distinguishing enrichment at solidification front.The segregation problem of large-scale steel ingot is researcher and business circles concern extremely.Though form in segregation and to obtain certain progress aspect the mechanism, like confirming etc. of segregation type, segregation position, making slow progress aspect the segregation control measure, almost there are not effective measures can suppress gross segregation.In decades in the production of large-scale steel ingot; Factory takes the method that lets it cool off naturally; Only solidify fully and rising head adopts the method for removing insulated feeder earlier to boost productivity when not solidifying fully at the ingot body; This method can only shift to an earlier date several hrs, and to compare effect in dozens or even hundreds of hour limited with the 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,, stir molten steel, quicken the steel ingot cooling, suppress ingotism through the agitator autophage with consumable formula agitator.
Thought of the present invention is to change the type of flow of not coagulating molten steel in the ingot solidification process, solves the alloying component macroscopic view, the microsegregation problem that produce in the large-scale steel ingot process of setting.Based on Fu Laiming (M.C.Flemings; U.S. MIT professor) principle that suppresses solidifying segregation is solidified in the stirring that proposes; The consumable agitator that behind the large-scale steel ingot casting complete, inserts is a low-temperature receiver; Be again the power source that drives Molten Steel Flow, reach the purpose that the steel ingot alloying component homogenizes in the process of setting through displacement and the rotary speed of controlling consumable formula agitator.
Technical scheme of the present invention is:
A kind of device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation comprises ingot mould and chassis, also comprises consumable formula agitator, up-down transverse arm, electric control gear and insulated feeder;
Be positioned at and connect the up-down transverse arm in the vertical rod of operating platform one side, electric control gear is fixed on the up-down transverse arm, and electric control gear is connected with consumable formula agitator, also is provided with insulated feeder above the ingot mould;
Said consumable formula 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 consumable formula agitator self is also in continuous consumption in the molten steel whipping process;
The laminated structure of said stirring vane for thickening gradually to root of blade from vane tip, and stirring vane adopts multilayer multi-disc mode to be fixedly connected on the shaft;
Said shaft is tapered from top to bottom;
One end of said up-down transverse arm is a sliding end, and this sliding end inwall has some rollers, and roller drives sliding end and moves up and down along vertical rod, control consumable formula shaft turnover ingot mould; This vertical rod is as the tracks of the sliding end of up-down transverse arm;
Said chassis also is fixed on the operating platform, and is positioned at a side of vertical rod, and ingot mould is placed on the chassis;
The size of the size of said insulated feeder and consumable formula agitator is complementary, and guarantees that consumable formula agitator can get into or shift out ingot mould through insulated feeder; Insulated feeder is with the insulation insulation board outward, and the insulation insulation board is with riser buss outward, and insulation insulation board and the mutual jam-packed of riser buss, plays insulation effect;
Said electric control gear comprises the control motor and speed reducer; Reductor is used to control the movement velocity of shaft, and shaft is connected with speed reducer output shaft through hitch bar; The control motor is used to control the reductor rotation, and the control motor is fixed on the up-down transverse arm, and the output of control motor connects the input of reductor.
Adopt above-mentioned consumable formula agitating device to prepare the method for large-scale homogeneous steel ingot, comprise the steps:
Step 1: ingot mould is vacuumized processing to prevent the molten steel secondary oxidation;
Step 2: in ingot mould, pour into a mould molten steel, then exothermic mixture and thermal-insulating covering agent are injected in the ingot mould, cover the molten steel surface and be incubated, to prevent that the shrinkage cavity of secondary oxidation agent steel ingot is with loose;
Step 3: after ingot steel casting is accomplished, and behind the steel ingot formation solidified shell, control up-down transverse arm is put into the ingot mould that fills with molten steel with consumable formula agitator from insulated feeder;
Step 4: when the distance of consumable formula agitator lower end and ingot mould bottom is three of a whole ingot mould height/for the moment, the formula agitator rotation of control Electric Machine Control consumable and gradually on move;
The speed of consumable formula agitator rotation is identical with molten steel free convection speed, and the speed of moving on the consumable formula agitator is identical with the speed that steel ingot is upwards solidified by its bottom;
The rotation of consumable formula agitator can make the primary dendrite fracture of solidification front, gets into and forms new nucleus in the melt, and enhanced tissue compactness suppresses metallic element component segregation phenomenon.
Step 5: when moving to the intermediate altitude of insulated feeder top and agitator lower end arrival insulated feeder on the consumable formula agitator upper end, the steel ingot in the ingot mould all solidifies, and shift out consumable formula agitator remainder this moment from ingot mould;
Step 6: wait for that steel ingot cools off fully, promptly accomplish the large-scale homogeneous steel ingot of preparation.
Beneficial effect:
In the device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation of the present invention, consumable formula agitator itself is a low-temperature receiver, can accelerate steel ingot Cooling Heat Transfer speed, shorten the ingot solidification time; The material of this agitator is identical with the final finished steel ingot, and composition meets the requirements, so after the oneself consumes fusing in the consumable formula agitator whipping process, is equivalent to adopt the closely knit large-scale steel ingot of qualified steel center structure, has eliminated defectives such as loose; The rotation of the rotation drive ingot solidification forward position molten steel of consumable formula agitator is flowed, and can make the primary dendrite fracture of solidification front, gets into and forms new nucleus in the melt, enhanced tissue compactness, inhibition metallic element component segregation phenomenon.
Description of drawings
Fig. 1 is a specific embodiment of the invention consumable formula agitator structure sketch map,
Wherein, be that stirring vane is the consumable formula agitator structure sketch map of 3 layer of 2 chip board-type structure (a),
(b) be that stirring vane is the consumable formula agitator structure sketch map of 3 layer of 2 chip swash plate type structure,
(c) be that stirring vane is the consumable formula agitator structure sketch map of 3 layer of 2 chip flexure mode structure,
(d) be that stirring vane is the consumable formula agitator structure sketch map of 3 layer of 3 chip board-type structure,
(e) be that stirring vane is the consumable formula agitator structure sketch map of 3 layer of 3 chip swash plate type structure,
(f) be that stirring vane is the consumable formula agitator structure sketch map of 3 layer of 3 chip flexure mode structure;
Fig. 2 is the consumable formula agitating device structural representation that the specific embodiment of the invention is used to prepare large-scale homogeneous steel ingot,
Wherein, be that the stirring vane of agitator is the consumable formula agitating device structural representation of 3 layer of 2 chip board-type structure (a),
(b) be that the stirring vane of agitator is the consumable formula agitating device structural representation of 3 layer of 2 chip swash plate type structure,
(c) be that the stirring vane of agitator is the consumable formula agitating device structural representation of 3 layer of 2 chip flexure mode structure,
(d) be that the stirring vane of agitator is the consumable formula agitating device structural representation of 3 layer of 3 chip board-type structure,
(e) be that the stirring vane of agitator is the consumable formula agitating device structural representation of 3 layer of 3 chip swash plate type structure,
(f) be that the stirring vane of agitator is the consumable formula agitating device structural representation of 3 layer of 3 chip flexure mode structure;
Wherein, the 1-ingot mould, the 2-riser buss, the 3-insulated feeder, 4-is incubated insulation board; The 5-chassis, 6-speed reducer output shaft, 7-ring flange, 8-shaft, 9-stirring vane; The 10-thermal-insulating covering agent, 11-exothermic mixture, 12-solidified shell, 13-molten steel, 14, steel ingot; The 15-reductor, 16-controls motor, 17-up-down transverse arm, 18 operating platforms, 19-vertical rod.
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is further specified.
The device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation of this embodiment is as shown in Figure 2, comprises ingot mould 1, consumable formula agitator, up-down transverse arm 17, electric control gear, insulated feeder 3, riser buss 2, insulation insulation board 4, chassis 5.
As shown in Figure 1, consumable formula agitator comprises shaft 8 and stirring vane 9, and the material of consumable formula agitator is identical with the large-scale homogeneous steel ingot of the finished product of finally preparing, and composition meets the requirements, and consumable formula agitator self is also in continuous consumption in the molten steel whipping process.
For guaranteeing that consumable formula 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 adopts multilayer multi-disc modes to be welded on the 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 so that it can get in the ingot mould 1 more than 2/3rds and rotating diameter should guarantee to pass in and out insulated feeder 3.
Shown in Fig. 1 (a) ~ (f), the stirring vane 9 of consumable formula agitator is the 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 confirmed according to the total amount of heat of prepared large-scale average steel ingot molten steel, promptly after stirring end, stirring vane 9 are as far as possible all consumed.
Electric control gear comprises control motor 16 and reductor 15; Reductor 15 is used to control the movement velocity of shaft 8; Shaft 8 is connected with speed reducer output shaft 6 through hitch bar, and in the present embodiment, reductor 15 can be fixed on the up-down transverse arm 17; Hitch bar is a ring flange 7, is used to connect speed reducer output shaft 6 and shaft 8; By the rotation of control motor 16 drive reductors 15, will control motor 16 and also be placed on the up-down transverse arm 17, the output of control motor 16 connects the input of reductor 15, and the elevating movement of up-down transverse arm 17 is controlled by OPS.
One end of up-down transverse arm 17 is a sliding end, and the sliding end inwall has 4 rollers, and sliding end is placed in the upper end of vertical rod 19, and this vertical rod 19 is as the tracks of the sliding end of up-down transverse arm 17; Vertical rod 19 is fixed on the operating platform 18; Chassis 5 also is fixed on the operating platform 18; And be positioned at a side of vertical rod 19, ingot mould 1 is placed on the chassis 5, and ingot mould 1 top is provided with insulated feeder 3; The size of the size of insulated feeder 3 and consumable formula agitator is complementary, and guarantees that consumable formula agitator can get into or shift out ingot mould 1 through insulated feeder 3; The insulated feeder 3 outer insulation insulation boards 4 that are with, the insulation insulation board 4 outer riser busses 2 that are with, and insulation insulation board 4 and riser buss 2 mutual jam-packeds 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 processing to prevent the molten steel secondary oxidation;
Step 2: in ingot mould, pour into a mould molten steel, then exothermic mixture and thermal-insulating covering agent are injected in the ingot mould, cover the molten steel surface and be incubated, to prevent that the shrinkage cavity of secondary oxidation agent steel ingot is with loose;
Step 3: after ingot steel casting is accomplished, and behind the solidified shell of steel ingot formation 100mm, control up-down transverse arm is put into the ingot mould that fills with molten steel with consumable formula agitator from insulated feeder;
Step 4: when the distance of consumable formula agitator lower end and ingot mould bottom is three of a whole ingot mould height/for the moment, the formula agitator rotation of control Electric Machine Control consumable and gradually on move;
The speed of consumable formula agitator rotation is identical with molten steel free convection speed, and the speed of moving on the consumable formula agitator is identical with the speed that steel ingot is upwards solidified by its bottom;
The rotation of consumable formula agitator can make the primary dendrite fracture of solidification front, gets into and forms new nucleus in the melt, and enhanced tissue compactness suppresses metallic element component segregation phenomenon.
Step 5: when moving to the intermediate altitude of insulated feeder top and agitator lower end arrival insulated feeder on the consumable formula agitator upper end, the steel ingot in the ingot mould all solidifies, and shift out consumable formula agitator remainder this moment from ingot mould;
Step 6: wait for that steel ingot cools off fully, promptly accomplish the large-scale homogeneous steel ingot of preparation.

Claims (7)

1. device that stirs the large-scale homogeneous steel ingot of preparation with consumable formula agitator; Comprise ingot mould and chassis; The chassis is fixed on the operating platform, and ingot mould is placed on the chassis, it is characterized in that: also comprise consumable formula agitator, up-down transverse arm, electric control gear, insulated feeder;
Be positioned at and connect the up-down transverse arm in the vertical rod of operating platform one side, electric control gear is fixed on the up-down transverse arm, and electric control gear is connected with consumable formula agitator, is provided with insulated feeder above the ingot mould;
Said consumable formula agitator comprises shaft and stirring vane, and stirring vane is fixedly connected on the shaft, and the material of agitator is identical with the large-scale homogeneous steel ingot of the finished product of finally preparing, and consumable formula agitator constantly consumes in the whipping process;
One end of said up-down transverse arm is a sliding end, and this sliding end inwall has some rollers, and roller drives sliding end and moves up and down along vertical rod, control consumable formula shaft turnover ingot mould;
Said electric control gear comprises the control motor and speed reducer;
Said shaft is connected with speed reducer output shaft through hitch bar; The control motor is fixed on the up-down transverse arm, and the output of control motor connects the input of reductor.
2. the device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation according to claim 1, it is characterized in that: said insulated feeder is with the insulation insulation board outward, and the insulation insulation board is with riser buss outward, and insulation insulation board and the mutual jam-packed of riser buss.
3. the device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation according to claim 1, it is characterized in that: said shaft is tapered from top to bottom.
4. the device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation according to claim 1 is characterized in that: said stirring vane adopts multilayer multi-disc mode to be fixedly connected on the shaft.
5. the device with the large-scale homogeneous steel ingot of consumable formula agitator stirring preparation according to claim 1 is characterized in that: the laminated structure of said stirring vane for thickening gradually to root of blade from vane tip.
6. the device that stirs the large-scale homogeneous steel ingot of preparation with consumable formula agitator according to claim 1; It is characterized in that: the size of the size of said insulated feeder and consumable formula agitator is complementary, and makes consumable formula agitator get into or to shift out ingot mould through insulated feeder.
7. adopt the described method of stirring the device of the large-scale homogeneous steel ingot of preparation of claim 1, it is characterized in that: comprise the steps: with consumable formula agitator
Step 1: ingot mould is vacuumized processing to prevent the molten steel secondary oxidation;
Step 2: in ingot mould, pour into a mould molten steel, then exothermic mixture and thermal-insulating covering agent are injected in the ingot mould, cover the molten steel surface and be incubated, to prevent that the shrinkage cavity of secondary oxidation agent steel ingot is with loose;
Step 3: after ingot steel casting is accomplished, and behind the steel ingot formation solidified shell, control up-down transverse arm is put into the ingot mould that fills with molten steel with consumable formula agitator from insulated feeder;
Step 4: when the distance of consumable formula agitator lower end and ingot mould bottom is three of a whole ingot mould height/for the moment, the formula agitator rotation of control Electric Machine Control consumable and gradually on move;
The speed of consumable formula agitator rotation is identical with molten steel free convection speed, and the speed of moving on the consumable formula agitator is identical with the speed that steel ingot is upwards solidified by its bottom;
Step 5: when moving to the intermediate altitude of insulated feeder top and agitator lower end arrival insulated feeder on the consumable formula agitator upper end, the steel ingot in the ingot mould all solidifies, and shift out consumable formula agitator remainder this moment from ingot mould;
Step 6: wait for that steel ingot cools off fully, promptly accomplish 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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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103436709A (en) * 2013-08-27 2013-12-11 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
CN104525024A (en) * 2015-01-23 2015-04-22 无锡华能表面处理有限公司 Lifting agitating mechanism for glue supply station
CN109047685A (en) * 2018-09-07 2018-12-21 乌克兰国家科学院E.O.巴顿电焊接研究所 A method of preparing steel 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
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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1296868A (en) * 2000-11-21 2001-05-30 白荣铠 Casting technology and apparatus for producing die-cast ingot, castings and conticast billet
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103436709A (en) * 2013-08-27 2013-12-11 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
CN104525024A (en) * 2015-01-23 2015-04-22 无锡华能表面处理有限公司 Lifting agitating mechanism for glue supply station
CN109047685A (en) * 2018-09-07 2018-12-21 乌克兰国家科学院E.O.巴顿电焊接研究所 A method of preparing steel ingot

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