CN102764869A - Continuous casting billet strengthening device and strengthening method in continuous casting process - Google Patents
Continuous casting billet strengthening device and strengthening method in continuous casting process Download PDFInfo
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- CN102764869A CN102764869A CN2012102457239A CN201210245723A CN102764869A CN 102764869 A CN102764869 A CN 102764869A CN 2012102457239 A CN2012102457239 A CN 2012102457239A CN 201210245723 A CN201210245723 A CN 201210245723A CN 102764869 A CN102764869 A CN 102764869A
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Abstract
The invention discloses a continuous casting billet strengthening device and a continuous casting billet strengthening method in a continuous casting process. The strengthening device is arranged at a secondary cold area below a crystallizer and is arranged near a continuous casting billet; and the strengthening device comprises a shot blaster, steel shots, a steel shot collecting box, a shot carrying pipeline and a shot spraying pipeline, wherein the shot blaster is connected with the steel shot collecting box by virtue of a shot carrying channel, the steel shot collecting box is arranged below the shot blaster, and the shot spraying channel is arranged at an exit of the shot blaster.
Description
Technical field
The invention belongs to the metallurgical continuous casting technical field, relate to the intensifying device and the intensifying method of continuous casting billet in a kind of casting process, specifically, the present invention relates to a kind of utilize the shot-blast process technology in casting process two cold-zones to the intensifying device and the intensifying method of continuous casting billet.
Background technology
In casting process; Strand is prone to produce center segregation, blemish and underbead crack; The blemish of strand for example has surface longitudinal crack, surface transverse cracks, transverse corner crack line, limit portion longitudinal crack etc., and the underbead crack of strand mainly contains middle crack, aligning crackle, corner crack, center line crackle, triangular area crack etc.The formation of continuous casting billet crackle is a very complicated process.The high temperature strand of band liquid core is in the conticaster running; Because of being used for making on the high temperature billet shell high temperature billet shell, various masterpieces produce distortion; The external cause that has cracked when having surpassed proof strength and the strain of steel; Steel is the internal cause that cracks to the sensitiveness of crackle, and conticaster equipment and technological factor are the conditions that cracks.
In order to improve the quality of continuous casting billet, also taked many measures in the casting process, to reach and the churned mechanically purpose of conventional cast, for example electromagnetic agitating technology and strand are depressed technology etc.
Though electromagnetic agitation to crystal grain thinning with alleviate center segregation and obtained certain effect; But equally also there are some problems: the electromagnetic agitation during (1) continuous casting is produced; Most of power supply energy all consumes gap or the eddy-current loss of conductor material, the i.e. heating between coil and molten steel.What really change into molten steel kinetic energy is a very little part in the power, so power factor is very low, operating cost is higher; (2) liquid steel water resistance rate is big, density is bigger etc., and these factors require electromagnetic agitation to need very big electromagnetic field, so solenoid is done hugelyr in the continuous casting, are unfavorable for the installation and maintenance of equipment; (3) it is very difficult only adopting electromagnetic agitation to suppress center segregation to some high-carbon steel; The electromagnetic agitation of (4) two cold-zones is easy to generate negative segregation.
Adopt when gently depressing technology, the size of drafts is very big to its result of use influence.Suitably increase drafts and help reducing center segregation, also can make the tendency aggravation of casting blank crack or depress roller is damaged but drafts is excessive.The technology of gently depressing is mainly used in the casting blank solidification end zone, is not suitable for two cold-zones, must accurately control the solid rate at casting process parameters, curing condition, pressure range strand center, matches casting speed and depresses speed.Any one control is improper, not only can not play the effect that improves center segregation, and very easily causes strand centre burst, and accurately application difficulty is bigger.In addition, the major defect with continuously forging and pressing under the weight is exactly that equipment is huge, investment is high with cost, therefore is difficult to popularization.Strong cold mode is adopted in the thermal stress minute-pressure down, receives the restriction of casting blank cross-section size, also can bring some negative effects, as increasing problems such as strand cracking frequency, reduction straightening temperature.
Summary of the invention
The object of the present invention is to provide the intensifying device and the intensifying method of continuous casting billet in a kind of casting process, specifically, the application process of a kind of shot-blast process technology two cold-zones in casting process is provided, thereby can improves the quality of continuous casting billet.The utilization shot-blast process can increase the continuous casting billet proportion of equiaxed grain, improves surface quality, reduces defective and crack number, improves the carrying out flaw detection qualification rate, promotes slab quality.
One side of the present invention provides the intensifying device of continuous casting billet in a kind of casting process, and said intensifying device is arranged on two cold-zones of crystallizer below, and be arranged on continuous casting billet near; Said intensifying device comprises wheel abrator, shot, shot collecting box, fortune ball pipeline and shot-peening passage; Wherein, wheel abrator is table roller or two disk wheel abrator, has that volume is less, the advantage of conveniently moving; Can in the conticaster confined space, external force be provided, satisfy the needs of continuous casting billet mechanical oscillation.Wheel abrator is connected to the shot collecting box through fortune ball passage, and the shot collecting box is arranged on the below of wheel abrator, and the shot-peening passage is arranged on the exit of wheel abrator, and wheel abrator is got to shot on the surface of continuous casting billet through the shot-peening passage.
According to a further aspect in the invention, wheel abrator can be fixed on a side, both sides or many sides of continuous casting billet.
According to a further aspect in the invention, said intensifying device also can comprise the protective cover on every side that is arranged on the shot-peening passage, and protective cover is truncated conical shape, and can certain inclination angle be arranged in the side near continuous casting billet.
According to a further aspect in the invention, can also be provided with the size outlet bigger slightly in the bottom of protective cover than shot, this outlet can be positioned at the shot collecting box directly over.
According to a further aspect in the invention, the big I of the outlet of protective cover bottom be set to the shot diameter 1.5-2 doubly.
According to a further aspect in the invention, wheel abrator and shot-peening passage can be arranged on the intrados of continuous casting billet.
According to a further aspect in the invention, protective cover maximum gauge place can be 1.2-1.5 a times of shot-peening channel diameter, and the diameter of fortune ball pipeline can be 3-5 a times of shot diameter.
One side of the present invention discloses the intensifying method of continuous casting billet in a kind of casting process, and this method forms continuous casting billet after comprising the steps: to make the crystallizer of molten steel through vibrations; In two cold-zones below crystallizer intensifying device is set; Utilize said intensifying device that continuous casting billet is carried out bead.Wherein, said intensifying device is identical with the intensifying device of continuous casting billet in the casting process according to an exemplary embodiment of the present invention.
In two cold-zones continuous casting billet is carried out bead, can apply compression continuous casting billet.Compression can reduce strand and rise again and produce the tendency of bulge.In casting process, secondary cooling water can cause thermal stress (tension), and is especially very big in position thermal stress such as strand corners, causes defectives such as crackle easily.Bead can apply compression at the base shell, thereby can offset portion of hot stress, therefore can reduce crack number and length.
Description of drawings
Through the description of carrying out below in conjunction with accompanying drawing to embodiment, above-mentioned and/or other purposes of the present invention and advantage will become apparent, wherein:
Fig. 1 is the sketch map of the intensifying device of continuous casting billet in the casting process according to an embodiment of the invention.
The specific embodiment
Describe in detail below with reference to accompanying drawings according to the present invention, exemplary embodiment of the present invention shown in the drawings, yet, only these accompanying drawings and embodiment are provided with exemplary and illustrative meaning, rather than from restrictive purpose.It will be appreciated by those skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change these embodiment.
Fig. 1 is the sketch map of the intensifying device of continuous casting billet in the casting process according to an embodiment of the invention.With reference to Fig. 1, the intensifying device of continuous casting billet can be arranged on two cold-zones of crystallizer 1 below in the casting process, and can be arranged on continuous casting billet 2 near.The intensifying device of continuous casting billet can comprise wheel abrator 3, shot 5, shot collecting box 6, fortune ball pipeline 7 and shot-peening passage 8; Wherein, Wheel abrator 3 is connected to shot collecting box 6 through fortune ball passage 7, and shot collecting box 6 is arranged on the below of wheel abrator 3, and shot-peening passage 8 is arranged on the exit of wheel abrator 3.According to the present invention, wheel abrator 3 can be fixed on extrados one side of continuous casting billet 2, the continuous casting billet left and right sides, or arrange that according to the required shot peening strength of strand wheel abrator 3 can be got to shot 5 on the surface of continuous casting billet 2 through shot-peening passage 8.Wheel abrator 3 can be ejected into the outside with the shot through 7 supplies of fortune ball passage.According to one embodiment of present invention, wheel abrator can be table roller or two disk wheel abrator, has that volume is less, the advantage of conveniently moving, can in the conticaster confined space, external force be provided, and satisfies the needs of continuous casting billet mechanical oscillation.Those skilled in the art can understand the function and the structure of wheel abrator 3, therefore, for clear and concise and to the point, here will omit the function of wheel abrator 3 and the detailed description of structure.
Through with shot 5 at a high speed and continuous injection to the surface of continuous casting billet 2, can be at the surface of strand 2 generation residual compressive stress layer.Under the protection of this compressive stress layer, residual compressive stress has improved crack closure power, has reduced maximum stress intensity factor, thereby has reduced the effective stress intensity factor amplitude, and crack growth rate is descended.Simultaneously, because the material surface oxide does not have plasticity, peel off after the fragmentation, therefore available shot-peening is removed oxide on surface, carries out surface treatment.
The big I of shot-peening power is controlled by the parameters such as power of the area of section of the length of shot size, shot-peening passage 8, shot-peening passage 8, wheel abrator engine (not shown) rotating speed, wheel abrator 3.For example, along with the size increase of shot 5, the shot of ejection has bigger kinetic energy, therefore can apply bigger impulsive force (shot-peening power) to continuous casting billet 2.In addition, along with the speed increase of shot 5, its kinetic energy that has also increases thereupon, thereby also can improve shot-peening power.Usually, increase the length of shot-peening passage 8, the means such as power that reduce the area of section of shot-peening passage 8, the rotating speed that improves the shot-peening engine, increase wheel abrator 3 all help increasing the speed of shot 5, thereby can improve shot-peening power.
In addition, can control the shot-peening angle through the angle of regulating between shot-peening passage 8 and the continuous casting billet 2.When shot-peening direction and strand in vertical state when (that is, the shot-peening angle is about 90 °), shot peening strength is the highest.When the shot-peening angle reduced, shot peening strength reduced along with reducing of shot-peening angle.Plumbness or nearly plumbness can improve shot blasting effect, and therefore according to one embodiment of present invention, the shot-peening angle should be controlled between 70 °-90 °.
According to one embodiment of present invention, also can around shot-peening passage 8, protective cover 4 be set, thereby can prevent that shot 5 from being rebounded to other positions with continuous casting billet 2 collision backs, and reduce the coverage of sound wave.Protective cover 4 is truncated conical shape, and in the side near continuous casting billet 2 certain inclination angle is arranged.Also can be provided with the size outlet bigger slightly in the bottom of protective cover 4 than shot 5, this outlet can be positioned at shot collecting box 6 directly over, thereby shot 5 is dropped on the shot collecting box 6 through this outlet exactly.Preferably, the 1.5-2 that outlet size that can protective cover 4 downsides is set to the shot diameter doubly.The shot 5 that drops on the shot collecting box 6 can be transported in the wheel abrator 3 through fortune ball passage 7, thereby realizes the recycle of shot 5, to reduce shot consumption and to practice thrift operating cost.
According to another embodiment of the present invention, can wheel abrator 3 and shot-peening passage 8 be arranged on the intrados of continuous casting billet 2, thus can be in continuous casting billet 2 cambered surface apply compression in advance, to reduce the aligning crack number.
According to one embodiment of present invention, wheel abrator 3 can provide the active force of certain limit, has that volume is less, the advantage of conveniently moving, can in the conticaster confined space, external force be provided, and satisfies the needs of continuous casting billet mechanical oscillation.Continuous casting billet 2 can bear certain external force in two cold-zones, and continuous casting billet 2 is realized mechanical oscillation in two cold-zones, can vibrate molten steel, pulverizes thick dendrite, improves proportion of equiaxed grain, reduces element segregation.
Therefore, continuous casting billet 2 is carried out bead, can apply compression continuous casting billet 2 in two cold-zones.Compression can reduce strand rises again and produces the tendency of bulge, and the casting process secondary cooling water can cause thermal stress (tension), and is especially very big in position thermal stress such as strand corners, causes defectives such as crackle.Bead applies compression at the base shell, can offset portion of hot stress, thereby reduces crack number and length.
The compression that shot-peening produces can be removed casting billet surface oxide skin, when shot-peening power is big, can reduces the strand tendency of bulge of rising again, thereby improve cc billet surface quality.
In addition, in the aligning process, the strand intrados bears aligning stress, and this tension is prone to make strand to produce the aligning crackle, and bead is applied in the continuous casting billet intrados, the compression that can apply in advance at the strand intrados, thus reduce the aligning crack number.
In addition, the intensifying method of continuous casting billet in a kind of casting process is provided according to another embodiment of the present invention, this method comprises the steps: to make molten steel to form continuous casting billet 2 through crystallizer 1 back of vibrations; In two cold-zones below crystallizer 1 the shot peening strengthening device is set; Utilize the shot peening strengthening device that continuous casting billet 2 is carried out bead.Wherein, basic identical according to the intensifying device of continuous casting billet in the shot peening strengthening device of this embodiment and the casting process of previous embodiment according to the present invention.
To the present invention be described through embodiment particularly below.
Embodiment 1: molten steel has certain thickness continuous casting billet 2 through the formation surface, crystallizer 1 back of vibration.Wheel abrator 3 behind the fixed position can be dished out shot 5 by certain speed range, shot 5 strikes the surface of continuous casting billet 2 through shot-peening passage 7.Protective cover 4 can help the collection and the safety in production of shot 5.Shot 5 is collected the back and gets into shot collecting box 6, and gets into wheel abrator 3 through fortune ball pipeline 7.Continuous casting billet 2 after handling through the intensifying device of continuous casting billet in the above-mentioned casting process can be offset portion of hot stress, reduces crack number and length, and can reduce the strand tendency of bulge of rising again, thereby improves cc billet surface quality.The speed range of the shot 5 that can confirm to dish out according to required shot peening strength, according to one embodiment of present invention, shot-peening speed can be 40m/s-60m/s.
Embodiment 2: similar with the intensifying device of continuous casting billet in the casting process of previous embodiment 1, and preferably make wheel abrator 3 certain distance arranged with respect to continuous casting billet 2, can confirm the installation site of wheel abrator 3 according to the needs of continuous casting process.Wherein, wheel abrator 3 can be installed in a side or many sides of continuous casting billet 2; Can symmetry install, also can asymmetricly install, perhaps independent the installation.In addition, preferably the outlet size of protective cover 4 downsides be set to the shot diameter 1.5-2 doubly, also can add the equipment that other assists to collect shot.Preferably, protective cover 4 maximum gauge places are 1.2-1.5 times of shot-peening channel diameter, and there is certain distance on the surface of the lower end of protective cover 4 and continuous casting billet 2, is convenient to the collection of shot 5.Preferably, the diameter of fortune ball pipeline 7 be the shot diameter 3-5 doubly, in addition, except using fortune ball pipeline 7, also can change is other fortune ball modes such as crawler type.
Though described the present invention with reference to exemplary embodiment, it should be understood by one skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change on form and the details to these exemplary embodiments.Scope of the present invention is limited claims and equivalent thereof.
Claims (8)
1. the intensifying device of continuous casting billet in the casting process; Said intensifying device is arranged on two cold-zones of crystallizer below, and be arranged on continuous casting billet near, said intensifying device comprises wheel abrator, shot, shot collecting box, fortune ball pipeline and shot-peening passage; Wherein, Wheel abrator is connected to the shot collecting box through fortune ball passage, and the shot collecting box is arranged on the below of wheel abrator, and the shot-peening passage is arranged on the exit wheel abrator of wheel abrator and through the shot-peening passage shot is got on the surface of continuous casting billet.
2. intensifying device as claimed in claim 1, wherein, wheel abrator is fixed on a side, both sides or many sides of continuous casting billet.
3. intensifying device as claimed in claim 1, wherein, said intensifying device also comprises the protective cover on every side that is arranged on the shot-peening passage, protective cover is truncated conical shape, and in the side near continuous casting billet 2 predetermined inclination angle is arranged.
4. intensifying device as claimed in claim 3 wherein, also is provided with the size outlet bigger slightly than shot in the bottom of protective cover, this outlet be positioned at the shot collecting box directly over.
5. intensifying device as claimed in claim 4, wherein, the outlet size of protective cover bottom is set to 1.5-2 times of shot diameter.
6. intensifying device as claimed in claim 1, wherein, wheel abrator and shot-peening passage are arranged on the intrados of continuous casting billet.
7. intensifying device as claimed in claim 1, wherein, the maximum gauge place of protective cover is 1.2-1.5 a times of shot-peening channel diameter, the diameter of fortune ball pipeline is 3-5 a times of shot diameter.
8. the intensifying method of continuous casting billet in the casting process, said intensifying method comprises the steps:
Form continuous casting billet after making the crystallizer of molten steel through vibrations;
Be provided with in two cold-zones below crystallizer according to any described intensifying device among the claim 1-7;
Utilize said intensifying device that continuous casting billet is carried out bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245723.9A CN102764869B (en) | 2012-07-16 | 2012-07-16 | Continuous casting billet strengthening device and strengthening method in continuous casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245723.9A CN102764869B (en) | 2012-07-16 | 2012-07-16 | Continuous casting billet strengthening device and strengthening method in continuous casting process |
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| Publication Number | Publication Date |
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| CN102764869A true CN102764869A (en) | 2012-11-07 |
| CN102764869B CN102764869B (en) | 2014-12-10 |
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| CN201210245723.9A Expired - Fee Related CN102764869B (en) | 2012-07-16 | 2012-07-16 | Continuous casting billet strengthening device and strengthening method in continuous casting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046057A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Hot-air jetting heating and shot-peening energy injecting type chemical heat treatment furnace |
| CN115338380A (en) * | 2022-10-18 | 2022-11-15 | 天津宏镁科技有限公司 | Method and system for continuous casting of magnesium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04305338A (en) * | 1991-04-01 | 1992-10-28 | Nkk Corp | Method for continuously casting billet for steel sheet |
| CN1196985A (en) * | 1997-03-18 | 1998-10-28 | 三菱重工业株式会社 | Double-cylinder continuously casting method |
| CN101265513A (en) * | 2008-01-23 | 2008-09-17 | 上海新亚欣科技有限公司 | Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device |
| CN102001046A (en) * | 2010-10-20 | 2011-04-06 | 无锡富岛精工有限公司 | Rotary table type automatic sand-blasting machine |
| CN202225082U (en) * | 2011-08-09 | 2012-05-23 | 华闽南配集团股份有限公司 | Bar type sand blasting device for inner circle and excircle of piston ring |
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2012
- 2012-07-16 CN CN201210245723.9A patent/CN102764869B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04305338A (en) * | 1991-04-01 | 1992-10-28 | Nkk Corp | Method for continuously casting billet for steel sheet |
| CN1196985A (en) * | 1997-03-18 | 1998-10-28 | 三菱重工业株式会社 | Double-cylinder continuously casting method |
| CN101265513A (en) * | 2008-01-23 | 2008-09-17 | 上海新亚欣科技有限公司 | Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device |
| CN102001046A (en) * | 2010-10-20 | 2011-04-06 | 无锡富岛精工有限公司 | Rotary table type automatic sand-blasting machine |
| CN202225082U (en) * | 2011-08-09 | 2012-05-23 | 华闽南配集团股份有限公司 | Bar type sand blasting device for inner circle and excircle of piston ring |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046057A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Hot-air jetting heating and shot-peening energy injecting type chemical heat treatment furnace |
| CN115338380A (en) * | 2022-10-18 | 2022-11-15 | 天津宏镁科技有限公司 | Method and system for continuous casting of magnesium alloy |
| CN115338380B (en) * | 2022-10-18 | 2023-01-03 | 天津宏镁科技有限公司 | Method and system for continuous casting of magnesium alloy |
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| CN102764869B (en) | 2014-12-10 |
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