CN106541098B - A kind of method and device mitigating continuous casting billet central defect - Google Patents
A kind of method and device mitigating continuous casting billet central defect Download PDFInfo
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- CN106541098B CN106541098B CN201510589857.6A CN201510589857A CN106541098B CN 106541098 B CN106541098 B CN 106541098B CN 201510589857 A CN201510589857 A CN 201510589857A CN 106541098 B CN106541098 B CN 106541098B
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Abstract
The present invention relates to a kind of method and device mitigating continuous casting billet central defect, method includes：1) removable drilling machine and removable sealing machine are installed in the solidification latter end region of continuous casting billet along continuous casting billet moving direction respectively；2) when the scale joint-cutting position of continuous casting billet reaches casting blank solidification end region, removable drilling machine drills at the joint-cutting position on continuous casting billet outer arc surface, strand core metal liquid stream goes out, and the purer molten metal in top substitutes the original easy higher molten metal of segregation element content；3) after molten metal being discharged, sealing machine is moved by chock to just holding out against in boring sites in curing, and drilling is made to be blocked completely；4) flame cutting machine cuts strand at scale joint-cutting position, the chock also cutting removal together being set at strand joint-cutting.By the way that the strand core liquid phase of segregation element enrichment is discharged in continuous casting billet solidification processing, the central defects such as the center segregation for even being eliminated continuous casting billet, center porosity are significantly mitigated；Its method is simple, operable strong, with obvious effects.
Description
Technical field
The present invention relates to smelting iron and steel continuous casting technology field more particularly to one kind can mitigate continuous casting billet center segregation, in
The method and device for the defects of heart is loose.
Background technology
Metal strand the defects of there are center segregation, center porosities, the performance of steel is seriously reduced, or even make
Steel are scrapped.Especially for some to the very stringent metal species of internal quality requirement, such as：Bridge steel, ship steel, axis
Hold steel, pressure vessel steel, cord steel etc..In the last hundred years, it although people use various methods, but still does not solve well
Certainly above-mentioned quality problems, defect still exists to a certain extent, and often results in product rejection.
Currently, the method for mitigating continuous casting billet central defect has end electromagnetic stirring method and slighter compress method, both methods
Deficiency is：1) end electromagnetic stirring method, deficiency existing for the method are：Thickness of solidified slab shell in secondary is big, the induction production of core liquid metal
Raw electromagnetic force is insufficient, and mixing effect is little；The solidification end position of each kind metal is different, and end electromagnetic stirring equipment position
Setting cannot be adjusted flexibly, and tend not to use；2) slighter compress method, deficiency existing for the method are：It is difficult to find suitable pressure
Amount, if drafts is small, cannot effectively mitigate defect, if drafts is big, strand may be made to crack；With end electricity
There are identical deficiencies for magnetic paddling process：The solidification end position of each kind metal is different, and device location cannot be adjusted flexibly, past
It is past to play a role.The molten metal of strand core liquid core is that segregation element concentration is apparently higher than other positions, after solidification
Segregation is certainly existed, does not change this situation after the processing of above two method.
The Chinese patent of (applying date be 2010 on August 23) discloses that " one kind has application No. is 201010260144.2
The technique of effect control center segregation of continuous cast slab ", passes through the stronger secondary coolingwater combination slighter compress section liquid of continuous casting billet solidifying end
The common effective control realized to center segregation of cylinder pressure pressure control.The pressure value for controlling slighter compress section hydraulic cylinder, controls simultaneously
Slighter compress section continuous casting billet inner arc side and slighter compress section continuous casting billet outer arc side water.By increasing the cold of slighter compress section continuous casting billet surface
But intensity, reaches that continuous casting billet surface is consistent with the core amount of remaining retracted, and controls the degree of center segregation to a certain extent, subtracts
The control continuous casting billet center segregation dependence to slighter compress section cylinder pressure merely is lacked, increase slighter compress equipment uses the longevity
Life, it is simple and easy to do.Deficiency is existing for this patent formula：Enhancing to the cooling of strand reach technical goal be it is infeasible, because
For, strand has certain thickness (being generally more than 70mm) internal-external temperature difference can be caused big after increasing intensity of cooling to a certain extent,
Cause strand is cracked to scrap.In addition, the shrinkage after casting blank solidification is very limited, and liquid phase of strand core itself
Shrinkage bigger, even if greatly increasing intensity of cooling, it is also difficult to realize effective control to center segregation.
The Chinese patent of (applying date is on December 13rd, 2006) discloses " a kind of straight application No. is 200610044355.6
Connect the method for intervening Inner Quality of Billet " metal sheet band is inserted into crystallizer molten steel by inserting apparatus, strip can be by suitable
Frequency and amplitude vibration.This method, can be with direct intervention solidified inside and knot by controlling strip inserted mode and speed
Brilliant mechanism can reduce the degree of superheat of crystallizer molten steel, shorten liquid phase acupoint depth, reduce column crystal, increase proportion of equiaxed grain, change
The solidified structure of kind strand, mitigates center segregation.The deficiency of this patent formula is：It is determined by the characteristics of continuous casting billet technique itself
Continuous casting billet liquid core molten metal must have certain degree of superheat, so its nucleus formed can be by refuse, the metal of feeding
The effect of strip can only reduce the degree of superheat, can not effectively solve the problems, such as center segregation, center porosity.
Invention content
The present invention provides a kind of methods mitigating continuous casting billet central defect, inclined by being discharged in continuous casting billet solidification processing
The strand core liquid phase for analysing enrichment of element significantly mitigates the centers such as the center segregation for even being eliminated continuous casting billet, center porosity and lacks
It falls into；Its method is simple, operable strong, with obvious effects；Invention also provides the devices for realizing the method.
In order to achieve the above object, the present invention is realized using following technical scheme：
A method of mitigating continuous casting billet central defect, includes the following steps：
1) removable drilling machine is installed in the solidification latter end region of continuous casting billet along continuous casting billet moving direction respectively and is moved
Sealing machine, the movable distance for moving drilling machine and removable sealing machine is 3~6m；
2) continuous casting billet is moved along throwing direction, when the scale joint-cutting position of continuous casting billet reaches the casting where moving drilling machine
When base solidification end region, drilling machine is moved with continuous casting billet synchronizing moving, and is bored at the joint-cutting position on continuous casting billet outer arc surface
Hole, drilling depth are the 1/3~2/3 of slab thickness；The drill bit for moving drilling machine after drilling is removed；Strand core is segregated at this time
The higher molten metal of constituent content is flowed out from drill hole under pressure, and the purer molten metal in top is filled and substituted downwards
The easy higher molten metal of segregation element content originally；Meanwhile molten metal continuous heating is flowed, solid phase outstanding is melted away, is made
It is more unimpeded to obtain Feeding channel；
3) it after 2~15% discharge molten metals for pressing every piece of finished product slab weight, moves sealing machine and synchronizes shifting with continuous casting billet
It is dynamic, by the hydraulic mandril of hydraulic cylinder by chock to just holding out against in boring sites in curing, and drilling is made to be blocked completely, near aperture
Molten metal quick solidification, it is hole to be drilled be solidified molten metal closing after, move sealing machine hydraulic mandril withdraw；
4) it moves drilling machine and removable sealing machine returns to original position, flame cutting machine is cut at scale joint-cutting position to be cast
Base, the chock also cutting removal together being set at strand joint-cutting.
For realizing a kind of device for the method mitigating continuous casting billet central defect, including it is mounted on continuous casting billet solidification latter end area
By the roller-way of domain, and can be set on the removable sealing machine with the synchronization-moving removable drilling machine of roller-way and removable sealing machine
There is hydraulic cylinder, chock, the drill bit of drilling machine and the hydraulic mandril of hydraulic cylinder equal direction are installed to hydraulic mandril head movement
The outer arc surface of continuous casting billet.
The removable drilling machine and removable sealing motor spindle are equipped with mobile device, and drilling machine and hydraulic cylinder can be with movements
Device moves, and mobile device is delivery platform, moving trolley or mechanical arm, and can realize and link with continuous casting billet rollgang.
The hydraulic mandril head is equipped with T shape connection structures, coordinates with U-shaped chock and installs.
The removable drilling machine and removable sealing machine are set up in parallel along roller-way conveying direction, movable distance 3
~6m.
Compared with prior art, the beneficial effects of the invention are as follows：
1) it by the way that the strand core liquid phase of segregation element enrichment is discharged in continuous casting billet solidification processing, significantly mitigates even
Eliminate the central defects such as center segregation, the center porosity of continuous casting billet；
2) method is simple, operable strong, with obvious effects, can improve 1 grade of center segregation or more；
3) apparatus structure is simple, easy to use, and less investment is quick；
4) the steel scrap liquid recoverable being discharged, will not cause to waste.
Description of the drawings
Fig. 1 is the structural schematic diagram of device of the present invention.
Fig. 2 is technical process schematic diagram one of the present invention.(drilling)
Fig. 3 is technical process schematic diagram two of the present invention.(drain)
Fig. 4 is technical process schematic diagram three of the present invention.(closure)
Fig. 5 is technical process schematic diagram four of the present invention.(cutting)
Fig. 6 is hydraulic cylinder mandril of the present invention and chock attachment structure schematic diagram.
In figure：1. 2. strand 3. of roller-way moves drilling machine 4. and moves 5. flame cutting machine of sealing machine, 6. metal
7. hydraulic cylinder mandril of liquid, 8. chock
Specific implementation mode
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings：
See Fig. 2-Fig. 5, is the technical process schematic diagram of the present invention, a kind of side mitigating continuous casting billet central defect of the present invention
Method includes the following steps：
1) removable drilling machine 3 and removable is installed in the solidification latter end region of continuous casting billet 2 along 2 moving direction of continuous casting billet respectively
Dynamic sealing machine 4, the movable distance for moving drilling machine 3 and removable sealing machine 4 is 3~6m；
2) continuous casting billet 2 is moved along throwing direction, where the scale joint-cutting position of continuous casting billet 2 reaches and moves drilling machine 3
Casting blank solidification end region when, move drilling machine 3 with 2 synchronizing moving of continuous casting billet, and in the joint-cutting on 2 outer arc surface of continuous casting billet
Position drills, and drilling depth is the 1/3~2/3 of 2 thickness of strand；The drill bit for moving drilling machine 3 after drilling is removed；Strand at this time
The higher molten metal of 2 core segregation element contents 6 is flowed out from drill hole under pressure, and the purer molten metal in top is downward
It fills and substitutes the original easy higher molten metal of segregation element content；Meanwhile molten metal continuous heating is flowed, melt away protrusion
Solid phase so that Feeding channel is more unimpeded；
3) it after 2~15% discharge molten metals 6 for pressing every piece of finished product slab weight, moves sealing machine 4 and is synchronized with continuous casting billet 2
It is mobile, by the hydraulic mandril 7 of hydraulic cylinder by chock 8 to just holding out against in boring sites in curing, and drilling is made to be blocked completely, aperture is attached
Close 6 quick solidification of molten metal, hole to be drilled to be solidified after molten metal 6 closes, the hydraulic mandril 7 for moving sealing machine 4 is withdrawn；
4) it moves drilling machine 3 and removable sealing machine 4 returns to original position, flame cutting machine 5 is cut at scale joint-cutting position
Strand 2, the also cutting removal together of chock 8 being set at 2 joint-cutting of strand.
See Fig. 1, is the structural schematic diagram of device of the present invention.It is of the present invention for realizing in a kind of mitigation continuous casting billet
The device of the method for heart defect, including be mounted on by the roller-way of continuous casting billet solidification latter end region, and can with roller-way 1 is synchronization-moving can
Mobile drilling machine 3 and removable sealing machine 4, the removable sealing machine 4 are equipped with hydraulic cylinder, 7 head movement of hydraulic mandril
Ground is equipped with chock 8, and the drill bit of drilling machine 3 and the hydraulic mandril 7 of hydraulic cylinder are towards the outer arc surface of continuous casting billet 2.
The removable drilling machine 3 and 4 motor spindles of removable sealing are equipped with mobile device, and drilling machine and hydraulic cylinder can be with shiftings
Dynamic device movement, mobile device is delivery platform, moving trolley or mechanical arm, and can realize and link with continuous casting billet rollgang 1.
7 club head of the hydraulic top is equipped with T shape connection structures, coordinates with U-shaped chock 8 and installs.(as shown in Figure 6)
The removable drilling machine 3 and 4 machines of removable sealing are set up in parallel along 1 conveying direction of roller-way, movable distance
For 3~6m.
In the present invention, the groundwork equipment for moving drilling machine 3 is drilling machine, moves the groundwork of sealing machine 4
Equipment is hydraulic cylinder, in order to realize its locomotive function, its bottom be arranged mobile device, mobile device can be delivery platform,
Moving trolley or mechanical arm, mobile device can be controlled individually, can also be realized and be linked by bindiny mechanism and continuous caster roller way 1,
To ensure that drilling machine, hydraulic cylinder are synchronous with the movement of strand 2.Mobile device can be separately provided in drilling machine and hydraulic cylinder bottom,
It may be provided in same mobile device, and realize the location swap of drilling machine and hydraulic cylinder by rotatable platform.
Sealing machine 4 is blocked chock 8 after drill hole by the hydraulic mandril 7 of hydraulic cylinder, due to meeting when molten metal 6 solidifies
Chock 8 is freezing together, therefore uses movable connection structure between chock 8 and hydraulic mandril 7, as shown in fig. 6, hydraulic top
Bar 7 is equipped with boss structure, keeps 7 head of hydraulic mandril T-shaped, and chock 8 is equipped with groove, and take the shape of the letter U structure, on hydraulic mandril 7
Boss and chock 8 on groove cooperation realize chock 8 flexible connection, when drill hole molten metal 6 solidify after, hydraulic mandril
7 retract, and chock 8 stays in 2 surface of strand.
In continuous casting steel production, molten steel forms Initial solid green shell first in crystallizer, subsequently into secondary cooling zone
Further cooling, " continuous casting billet " at this time is though surface has formed solid-state green shell, and actually centre is still red-hot liquid phase
There are one elongated conical liquid steel water area, this region is known as liquid core for molten steel, i.e. band.The present invention is exactly to pass through drilling
Molten metal 6 in liquid core is discharged.The molten metal 6 of drilling discharge is controlled by 2~15% of every piece of finished product slab weight after cutting
System, can be scaled efflux time according to bore diameter and 6 flow velocity of molten metal, by controlling 6 efflux time accurate perception of molten metal
Discharge rate.The molten metal 6 of discharge is used as steel scrap reuse by setting after 1 lower part waste collection slot of roller-way is collected.
Following embodiment is being implemented down based on the technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
It is conventional method not mentionlet alone bright.
【Embodiment 1】
Continuous casting steel for tyre cord, 2 cross dimensions of strand：300mm × 400mm, casting speed：0.85m/min.
Operating process is as follows：
1. the solidification latter end regional location installation in continuous casting billet moves drilling machine 3, bit diameter 18mm；
2. when the scale joint-cutting position of continuous casting billet 2 reaches the casting blank solidification end region at 3 place of drilling machine, moves and bore
Hole machine 3 acts, and drill bit is located in the strand widthwise central position at 2 outer arc surface joint-cutting position of continuous casting billet, drilling to 2 thickness of strand
1/2, i.e. drilling depth reaches 150mm backed off after random drill bits；During this, removable drilling machine 3 is moved synchronously with continuous casting billet 2；
3. after the molten metal 6 of 50kg or so is discharged, moving sealing machine 4 and acting, chock 8 is blocked in drill hole；
After 4. molten metal 6 solidifies, removable sealing machine 4 is removed；
5. flame cutting machine 5 in scale joint-cutting position cutting strand 2, is set in the chock 8 at strand joint-cutting also together
Cutting removal.
Finished product strand is through examining, and center segregation improves 1 grade or more, and yield rate improves caused benefit about 200~810
Yuan/ton steel.Molten steel about 50kg is released, meter strand ton steel about loses 6kg molten steel, releases molten steel and is recycled as steel scrap.Economic loss
About 6 yuan/ton of steel.The two adds up to benefit：About 194~804 yuan/ton of steel.
【Embodiment 2】
Continuous casting bearing steel, 2 cross dimensions of strand：Casting speed：1.10m/min.
Operating process is as follows：
1. the solidification latter end regional location installation in continuous casting billet 2 moves drilling machine 3, bit diameter 16mm；
2. when the scale joint-cutting position of continuous casting billet 2 reaches the casting blank solidification end region at 3 place of drilling machine, moves and bore
Hole machine 3 acts, and drill bit is located in the strand widthwise central position at 2 outer arc surface joint-cutting position of continuous casting billet, drilling to 2 thickness of strand
1/2, i.e. drilling depth reaches 140mm backed off after random drill bits；During this, removable drilling machine 3 is moved synchronously with continuous casting billet 2；
3. after the molten metal 6 of 35kg or so is discharged, moving sealing machine 4 and acting, chock 8 is blocked in drill hole；
After 4. molten metal 6 solidifies, removable sealing machine 4 is removed.
5. flame cutting machine 5 in scale joint-cutting position cutting strand 2, is set in the chock 8 at strand joint-cutting also together
Cutting removal.
Finished product strand is through examining, and center segregation improves 1 grade or more, and yield rate improves caused benefit about 150~800
Yuan/ton steel.Molten steel about 30kg is released, meter strand ton steel about loses 5kg molten steel, releases molten steel and is recycled as steel scrap.Economic loss
About 7 yuan/ton of steel.The two adds up to benefit：About 143~793 yuan/ton of steel.
Claims (5)
1. a kind of method mitigating continuous casting billet central defect, which is characterized in that include the following steps：
1) removable drilling machine and removable sealing are installed in the solidification latter end region of continuous casting billet along continuous casting billet moving direction respectively
Machine, the movable distance for moving drilling machine and removable sealing machine is 3~6m；
2) continuous casting billet is moved along throwing direction, is coagulated when the scale joint-cutting position of continuous casting billet reaches the strand where moving drilling machine
Gu when terminal region, moving drilling machine with continuous casting billet synchronizing moving, and drill, bores at the joint-cutting position on continuous casting billet outer arc surface
Hole depth is the 1/3~2/3 of slab thickness；The drill bit for moving drilling machine after drilling is removed；Strand core segregation element at this time
The higher molten metal of content is flowed out from drill hole under pressure, and the purer molten metal in top is filled downwards and substituted original
The easy higher molten metal of segregation element content；Meanwhile molten metal continuous heating is flowed, melt away solid phase outstanding so that mend
Contracting channel is more unimpeded；
3) after 2~15% discharge molten metals for pressing every piece of finished product slab weight, sealing machine is moved with continuous casting billet synchronizing moving, is led to
The hydraulic mandril of hydraulic cylinder is crossed by chock to just holding out against in boring sites in curing, and drilling is made to be blocked completely, the metal near aperture
Liquid quick solidification, it is hole to be drilled be solidified molten metal closing after, move sealing machine hydraulic mandril withdraw；
4) it moves drilling machine and removable sealing machine returns to original position, flame cutting machine cuts strand, quilt at scale joint-cutting position
The chock also cutting removal together being set at strand joint-cutting.
2. for realizing a kind of device for the method mitigating continuous casting billet central defect described in claim 1, which is characterized in that packet
It includes by the roller-way of continuous casting billet solidification latter end region, and can be with the synchronization-moving removable drilling machine of roller-way and removable sealing
Machine, the removable sealing machine are equipped with hydraulic cylinder, are equipped with to hydraulic mandril head movement chock, the drill bit of drilling machine and
The hydraulic mandril of hydraulic cylinder is towards the outer arc surface of continuous casting billet.
3. a kind of device mitigating continuous casting billet central defect according to claim 2, which is characterized in that the removable brill
Hole machine and removable sealing motor spindle are equipped with mobile device, and drilling machine and hydraulic cylinder can be moved with mobile device, and mobile device is
Delivery platform, moving trolley or mechanical arm, and can realize and link with continuous casting billet rollgang.
4. a kind of device mitigating continuous casting billet central defect according to claim 2, which is characterized in that the hydraulic mandril
Head is equipped with T shape connection structures, coordinates with U-shaped chock and installs.
5. a kind of device mitigating continuous casting billet central defect according to claim 2, which is characterized in that the removable brill
Hole machine and removable sealing machine are set up in parallel along roller-way conveying direction, and movable distance is 3~6m.
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| CN201510589857.6A CN106541098B (en) | 2015-09-17 | 2015-09-17 | A kind of method and device mitigating continuous casting billet central defect |
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| CN201510589857.6A CN106541098B (en) | 2015-09-17 | 2015-09-17 | A kind of method and device mitigating continuous casting billet central defect |
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| CN106541098B true CN106541098B (en) | 2018-08-03 |
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Citations (6)
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|---|---|---|---|---|
| US4624298A (en) * | 1980-12-23 | 1986-11-25 | Hamburger Stahlwerke Gmbh | Method of cooling strands in the continuous casting of steel |
| CN1156979A (en) * | 1995-06-21 | 1997-08-13 | 住友金属工业株式会社 | Continuous casing of thin cast pieces |
| CN101695747A (en) * | 2009-11-03 | 2010-04-21 | 攀钢集团研究院有限公司 | Method for controlling bloom continuous casting dynamic soft-reduction pressure interval |
| CN101868314A (en) * | 2007-11-19 | 2010-10-20 | Posco公司 | Continuous cast slab and method for manufacturing the same |
| CN204584220U (en) * | 2015-03-31 | 2015-08-26 | 新日铁住金工程技术株式会社 | Continuous casting apparatus |
| CN205056974U (en) * | 2015-09-17 | 2016-03-02 | 鞍钢股份有限公司 | Alleviate device of continuous casting billet center defect |
-
2015
- 2015-09-17 CN CN201510589857.6A patent/CN106541098B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4624298A (en) * | 1980-12-23 | 1986-11-25 | Hamburger Stahlwerke Gmbh | Method of cooling strands in the continuous casting of steel |
| CN1156979A (en) * | 1995-06-21 | 1997-08-13 | 住友金属工业株式会社 | Continuous casing of thin cast pieces |
| CN101868314A (en) * | 2007-11-19 | 2010-10-20 | Posco公司 | Continuous cast slab and method for manufacturing the same |
| CN101695747A (en) * | 2009-11-03 | 2010-04-21 | 攀钢集团研究院有限公司 | Method for controlling bloom continuous casting dynamic soft-reduction pressure interval |
| CN204584220U (en) * | 2015-03-31 | 2015-08-26 | 新日铁住金工程技术株式会社 | Continuous casting apparatus |
| CN205056974U (en) * | 2015-09-17 | 2016-03-02 | 鞍钢股份有限公司 | Alleviate device of continuous casting billet center defect |
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| CN106541098A (en) | 2017-03-29 |
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