CN102764869B - 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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- CN102764869B CN102764869B CN201210245723.9A CN201210245723A CN102764869B CN 102764869 B CN102764869 B CN 102764869B CN 201210245723 A CN201210245723 A CN 201210245723A CN 102764869 B CN102764869 B CN 102764869B
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- peening
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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 metallurgical continuous casting technical field, relate to 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 shot-blast process technology in casting process two cold-zones to the intensifying device of continuous casting billet and intensifying method.
Background technology
In casting process, strand easily produces center segregation, blemish and underbead crack, the blemish of strand is such as having 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 Cracks In Continuous Cast Billets is a very complicated process.With the high temperature strand of liquid core in conticaster running, because various masterpieces are for making high temperature billet shell produce distortion on high temperature billet shell, the external cause having cracked while having surpassed the proof strength of steel and strain, steel is the internal cause cracking to the sensitiveness of crackle, and continuous casting machine and technological factor are the conditions cracking.
In order to improve the quality of continuous casting billet, in casting process, also taked many measures, to reach and the churned mechanically object of conventional cast, such as electromagnetic agitating technology and strand Reduction Technology etc.
Although electromagnetic agitation is to crystal grain thinning and alleviate center segregation and obtained certain effect, but equally also there are some problems: the electromagnetic agitation in the production of (1) continuous casting, 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 power, therefore power factor is very low, operating cost is higher; (2) liquid steel water resistance rate is large, density ratio is larger etc., and these factors require electromagnetic agitation to need very large electromagnetic field, so solenoid is done hugelyr in continuous casting, are unfavorable for the installation and maintenance of equipment; (3) it is very difficult to some high-carbon steel, only adopting electromagnetic agitation to suppress center segregation; The electromagnetic agitation of (4) two cold-zones easily produces negative segregation.
While adopting light Reduction Technology, the size of drafts is very large on its result of use impact.Suitably increase drafts and be conducive to reduce center segregation, but drafts is excessive, also can makes the tendency aggravation of casting blank crack or depress roller is damaged.Light Reduction Technology is mainly used in casting blank solidification end region, 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 pressing speed.Any one control is improper, not only can not play the effect that improves center segregation, and very easily causes strand centre burst, accurately applies difficulty larger.In addition, under weight, be exactly that equipment is huge, investment and cost is high with the major defect of continuous forging, be therefore difficult to promote.Under thermal stress minute-pressure, adopt strong cold mode, be subject to the restriction of casting blank cross-section size, also can be with and serve negative effect, as increased strand cracking frequency, reducing the problems such as straightening temperature.
Summary of the invention
The object of the present invention is to provide intensifying device and the intensifying method of continuous casting billet in a kind of casting process, specifically, provide the application process of a kind of shot-blast process technology two cold-zones in casting process, thereby can improve the quality of continuous casting billet.Use shot-blast process can increase continuous casting billet proportion of equiaxed grain, improve surface quality, reduce defect and crack number, improve carrying out flaw detection qualification rate, promote slab quality.
An aspect of of the present present invention provides the intensifying device of continuous casting billet in a kind of casting process, described intensifying device is arranged on two cold-zones of crystallizer below, and be arranged on continuous casting billet near, described 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 advantages of small volume, conveniently moving, can in the conticaster confined space, provide external force, meet the needs of continuous casting billet mechanical oscillation.Wheel abrator is connected to shot collecting box by fortune ball passage, and shot collecting box is arranged on the below of wheel abrator, and shot-peening channel setting is in the exit of wheel abrator, and wheel abrator is got to shot on the surface of continuous casting billet by 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, described intensifying device also can comprise the protective cover of the surrounding that is arranged on shot-peening passage, and protective cover is truncated conical shape, and can have certain inclination angle in the side near continuous casting billet.
According to a further aspect in the invention, can also be provided with in the bottom of protective cover the outlet that size is slightly larger than shot, this outlet can be positioned at shot collecting box directly over.
According to a further aspect in the invention, the 1.5-2 that the large I of the outlet of protective cover bottom is set to shot diameter 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 times of shot-peening channel diameter, and the diameter of fortune ball pipeline can be 3-5 times of shot diameter.
An aspect of of the present present invention discloses the intensifying method of continuous casting billet in a kind of casting process, and the method comprises the steps: to make molten steel to form continuous casting billet after the crystallizer of vibrations; In two cold-zones below crystallizer, intensifying device is set; Utilize described intensifying device to carry out bead to continuous casting billet.Wherein, described intensifying device is identical with the intensifying device of continuous casting billet in casting process according to an exemplary embodiment of the present invention.
In two cold-zones, continuous casting billet is carried out to bead, can apply compression to 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), especially very large in position thermal stress such as strand corners, easily causes defects i.e.cracks.Bead can apply compression at base shell, thereby can offset part thermal stress, therefore can reduce crack number and length.
Accompanying drawing explanation
By the description to embodiment of carrying out below in conjunction with accompanying drawing, above-mentioned and/or other objects of the present invention and advantage will become apparent, wherein:
Fig. 1 is the schematic diagram of the intensifying device of continuous casting billet in casting process according to an embodiment of the invention.
The specific embodiment
Describe in detail according to the present invention below with reference to accompanying drawings, exemplary embodiment of the present invention shown in the drawings, yet, only with exemplary and explanat meaning, provide these drawings and Examples, rather than for restrictive object.It will be appreciated by those skilled in the art that without departing from the spirit and scope of the present invention, can carry out various modifications and change to these embodiment.
Fig. 1 is the schematic diagram of the intensifying device of continuous casting billet in casting process according to an embodiment of the invention.With reference to Fig. 1, in casting process, the intensifying device of continuous casting billet can be arranged on two cold-zones of crystallizer 1 below, 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 by 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 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 by shot-peening passage 8.Wheel abrator 3 can be ejected into outside by the shot by 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 advantages of small volume, conveniently moving, can in the conticaster confined space, provide external force, meets the needs of continuous casting billet mechanical oscillation.Those skilled in the art can understand the function and structure of wheel abrator 3, therefore, and for clear and concise and to the point, here by the detailed description of omitting the function and structure of wheel abrator 3.
By by 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 effective SIF range value, and crack growth rate is declined., because material surface oxide does not have plasticity, after fragmentation, peel off, therefore available shot-peening is removed oxide on surface, carries out surface treatment meanwhile.
The large I of shot-peening power is controlled by shot size, the length of shot-peening passage 8, the parameters such as power of the area of section of 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 larger kinetic energy, therefore can apply larger impulsive force (shot-peening power) to continuous casting billet 2.In addition, along with the speed increase of shot 5, its kinetic energy having also increases thereupon, thereby also can improve shot-peening power.Conventionally, 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 shot-peening engine, increase wheel abrator 3 are all conducive to increase the speed of shot 5, thereby can improve shot-peening power.
In addition, can be by regulating the angle between shot-peening passage 8 and continuous casting billet 2 to control shot-peening angle.When shot-peening direction and strand are in vertical state when (that is, shot-peening angle is about 90 °), shot peening strength is the highest.When shot-peening angle reduces, shot peening strength reduces 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, shot-peening angle should be controlled between 70 °-90 °.
According to one embodiment of present invention, also protective cover 4 can be set in the surrounding of shot-peening passage 8, thereby can prevent that shot 5 from being rebounded to other positions with continuous casting billet 2 collisions are rear, and reduce the coverage of sound wave.Protective cover 4 is truncated conical shape, and has certain inclination angle in the side near continuous casting billet 2.Bottom at protective cover 4 also can be provided with the outlet that size is slightly larger than shot 5, this outlet can be positioned at shot collecting box 6 directly over, thereby can make shot 5 drop on exactly on shot collecting box 6 by this outlet.Preferably, the 1.5-2 that outlet size that can protective cover 4 downsides is set to shot diameter doubly.The shot 5 dropping on shot collecting box 6 can be transported in wheel abrator 3 by fortune ball passage 7, thereby realizes recycling of shot 5, to reduce shot consumption and to save operating cost.
According to another embodiment of the present invention, wheel abrator 3 and shot-peening passage 8 can be arranged on to the intrados of continuous casting billet 2, thus can be in continuous casting billet 2 cambered surface apply in advance compression, to reduce aligning crack number.
According to one embodiment of present invention, wheel abrator 3 can provide the active force of certain limit, has advantages of small volume, conveniently moving, can in the conticaster confined space, provide external force, meets 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, in two cold-zones, continuous casting billet 2 is carried out to bead, can apply compression to continuous casting billet 2.Compression can reduce strand rises again and produces the tendency of bulge, and casting process secondary cooling water can cause thermal stress (tension), especially very large in position thermal stress such as strand corners, causes defects i.e.cracks.Bead applies compression at base shell, can offset part thermal 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 larger, can reduces the strand tendency of bulge of rising again, thereby improve cc billet surface quality.
In addition, in aligning process, strand intrados bears aligning stress, and this tension easily makes strand produce aligning crackle, and bead is applied in continuous casting billet intrados, the compression that can apply in advance at strand intrados, thus reduce aligning crack number.
In addition, provide according to another embodiment of the present invention the intensifying method of continuous casting billet in a kind of casting process, the method comprises the steps: to make molten steel to form continuous casting billet 2 after the crystallizer 1 of vibrations; In two cold-zones below crystallizer 1, shot peening strengthening device is set; Utilize shot peening strengthening device to carry out bead to continuous casting billet 2.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 by embodiment particularly below.
Embodiment 1: molten steel forms surface and has certain thickness continuous casting billet 2 after the crystallizer 1 of vibration.Wheel abrator 3 behind 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 be conducive to collection and the safety in production of shot 5.After shot 5 is collected, enter shot collecting box 6, and enter wheel abrator 3 by fortune ball pipeline 7.Continuous casting billet 2 after the intensifying device of continuous casting billet in above-mentioned casting process is processed can be offset part thermal stress, reduces crack number and length, and can reduce the strand tendency of bulge of rising again, thereby improves cc billet surface quality.Can according to required shot peening strength, determine the speed range of the shot 5 of dishing out, 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 have certain distance with respect to continuous casting billet 2, can determine according to the needs of continuous casting process the installation site of wheel abrator 3.Wherein, wheel abrator 3 can be installed in the one side or the multi-lateral of continuous casting billet 2; Can symmetrical install, also can asymmetric installation, or independent installation.In addition, the 1.5-2 that preferably the outlet size of protective cover 4 downsides is set to shot diameter 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 is 3-5 times of shot diameter, in addition, except using fortune ball pipeline 7, also can change as other fortune ball modes such as crawler types.
Although described the present invention with reference to exemplary embodiment, it should be understood by one skilled in the art that without departing from the spirit and scope of the present invention, can carry out various modifications and the change in form and details to these exemplary embodiments.Scope of the present invention is limited by claims and equivalent thereof.
Claims (8)
1. the intensifying device of continuous casting billet in a casting process, described intensifying device is arranged on two cold-zones of crystallizer below, and be arranged on continuous casting billet near, described intensifying device comprises wheel abrator, shot, shot collecting box, fortune ball pipeline and shot-peening passage, wherein, wheel abrator is connected to shot collecting box by fortune ball passage, and shot collecting box is arranged on the below of wheel abrator, and shot-peening channel setting is got to shot on the surface of continuous casting billet by shot-peening passage at the exit of wheel abrator wheel abrator.
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, described intensifying device also comprises the protective cover of the surrounding that is arranged on shot-peening passage, protective cover is truncated conical shape, and has predetermined inclination angle in the side near continuous casting billet 2.
4. intensifying device as claimed in claim 3, wherein, is also provided with in the bottom of protective cover the outlet that size is slightly larger than shot, this outlet be positioned at shot collecting box directly over.
5. intensifying device as claimed in claim 4, wherein, the 1.5-2 that the outlet size of protective cover bottom is set to shot diameter doubly.
6. intensifying device as claimed in claim 1, wherein, wheel abrator and shot-peening channel setting are at the intrados of continuous casting billet.
7. intensifying device as claimed in claim 1, wherein, the maximum gauge place of protective cover be shot-peening channel diameter 1.2-1.5 doubly, the diameter of fortune ball pipeline be shot diameter 3-5 doubly.
8. an intensifying method for continuous casting billet in casting process, described intensifying method comprises the steps:
Make molten steel form continuous casting billet after the crystallizer of vibrations;
In two cold-zones below crystallizer, arrange according to the intensifying device described in any one in claim 1-7;
Utilize described intensifying device to carry out bead to continuous casting billet.
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 CN102764869A (en) | 2012-11-07 |
| CN102764869B true 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046057B (en) * | 2013-01-25 | 2014-09-24 | 山东大学 | Hot-air jetting heating and shot-peening energy injecting type chemical heat treatment furnace |
| 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 |
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 |
-
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 |
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| CN102764869A (en) | 2012-11-07 |
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