CN201357216Y - Continuous casting crystallizer for wave-shaped wall surface - Google Patents
Continuous casting crystallizer for wave-shaped wall surface Download PDFInfo
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- CN201357216Y CN201357216Y CNU2009200679515U CN200920067951U CN201357216Y CN 201357216 Y CN201357216 Y CN 201357216Y CN U2009200679515 U CNU2009200679515 U CN U2009200679515U CN 200920067951 U CN200920067951 U CN 200920067951U CN 201357216 Y CN201357216 Y CN 201357216Y
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- crystallizer
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- wall surfaces
- cast mold
- continuous cast
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Abstract
A continuous casting crystallizer for a wave-shaped wall surface is square or rectangular and is characterized in that the continuous casting crystallizer for a wave-shaped wall surface is a mold cavity which is hollowly square or rectangular from the pouring-in end of a metal melt to the outlet end of a casting blank; and the wall surface of the cross section of the mold cavity is a wave-shaped curved surface. The continuous casting crystallizer for a wave-shaped wall surface of the utility model sufficiently shows the shrinkage essence of a solidified blank shell in the continuous casting process, effectively overcomes air gap thermal resistance caused by poor blank shell shrinkage, has an obvious effect on the improvement on the cooling strength and the continuous casting speed of a blank shell, meets the technical requirements of efficient continuous casting development, and has a greater application and popularization value.
Description
Technical field
The utility model relates to a kind of continuous cast mold of field of metallurgy, and especially, the utility model relates to a tubular continuous casting mould, and described tubular continuous casting mould is square or rectangle, and the die cavity of described continuous cast mold is improved, to improve continuous casting crystallining efficient.
Background technology
High efficiency continuous casting is a developing direction in present metallurgical continuous casting field, and one of its key technology is exactly to adopt the high efficiency continuous casting crystallizer.For little square billet or rectangular bloom, the continuous casting pulling rate can be called the high efficiency continuous casting category basically more than 2.5m/min.Compare traditional continuous cast mold, the high efficiency continuous casting crystallizer mainly improves from following 2 aspects: the one, increase length of mould, and molten steel setting time in crystallizer is increased, form thicker base shell; The 2nd, solidification shrinkage and the part external force deformation of die cavity to adapt to molten steel of change continuous cast mold.More than change crystallizer in two factors die cavity be the key of high efficiency continuous casting crystallizer.
In casting process, molten steel takes place in the crystallizer die cavity from liquid state to solid-state phase transformation, produces body and shrinks, thereby form certain air gap between crystallizer and solidified shell.According to relevant documents and materials, the air gap thermal resistance that this air gap causes accounts for total more than 70% of heat transfer resistance in the crystallizer, therefore serious obstruction the solidify cooling of strand at crystallizer, thereby, many production problems such as bleed-out, the change of strand water chestnut take place easily.
For eliminating the baneful influence that the air gap thermal resistance is brought, the die cavity of crystallizer generally all is designed to up big and down small back draught form, though and traditional single tapering continuous cast mold can satisfy the needs of conventional continuous casting, but single tapering die cavity can not well reflect the contraction essence of molten steel in crystallizer, cause base shell intensity of cooling obviously not enough, thereby limited the development of high efficiency continuous casting.
Along with the continuous development of continuous casting technology, the crystallizer die cavity progressively develops into many taperings form and parabola taper form from traditional single tapering form, has effectively promoted the development of high-efficient continuous casting technology.From prior art, the most typical with three kinds of high efficiency continuous casting crystallizers of three foreign corporations at present.
Switzerland CONCAST company developed a kind of convex-edge shape crystallizer (CONVEXtechnology), its U.S. Patent number 5360053, China Patent No. 92100838.4 in 1991.The technical characterstic of this crystallizer is to be divided into 2 sections different die cavities at crystallizer on by length direction, crystallizer top die cavity has the arc of four projectioies along the cross section contour, the curved wall angle is the obtuse angle, and arc convex progressively is transited into straight flange from top to bottom, constitutes crystallizer bottom die cavity; The bottom die cavity is traditional single tapering form, accounts for 40～60% of crystallizer total length.This crystallizer technology reduces base shell and crystallizer wall air gap, and it is more even with the side face heat transfer that angle is conducted heat, and cooling effect improves significantly, to improving the continuous casting pulling rate obvious benefit is arranged.This crystallizer is used more extensive after Thyssen company tries out successfully at present in the whole world.
Austrian Australia steel connection VAI succeeded in developing DIAMOLD high-speed continuous casting crystallizer in 1996, China Patent No. 96190354.6, be characterized on the whole length of crystallizer, adopting parabola shaped tapering, solidification shrinkage that can very good match base shell, and the folding corner region below crystallizer inlet 300～400mm adopts cone of nulls degree or negative tapering, the wall angle acutangulates, and wall forms cancave cambered surface.Because the crystallizer angle adopts the cone of nulls degree or the negative conical surface, the continuous casting resistance of billet withdrawal is less relatively, and high efficiency continuous casting has been played remarkable effect.
The self-adapted high-efficient continuous cast mold of Italian DANIELI company exploitation in 1996, its basic characteristics are attenuate crystallizer copper walls, change a cold water pressure and distribution in the crystallizer water jacket, utilize hydraulic pressure to regulate the distortion of crystallizer wall, make it be close to the base shell, reach the elimination air gap, improve heat transfer efficiency, thereby improve the effect of the pulling rate of continuous casting continuous casting.
The high efficiency continuous casting crystallizer that above patented technology relates to though can improve slab quality and continuous casting pulling rate to a certain extent, owing to the essence analysis that metal freezing in the casting process is shunk is not enough, thereby all has limitation separately.Such as, though CONCAST has good action to preventing bleed-out and off-square, but the taper ratio of convex-edge shape crystallizer die cavity approaches two sections tapering forms, cause in the process of billet withdrawal resistance of billet withdrawal bigger, to the steel grade such as stainless steel or bearing steel, will produce bleedout or draw a motionless production difficult problem; Australia steel connection diamond crystallizer has effectively reduced resistance of billet withdrawal, but because the existence of concave surface has produced harmful effect to the setting of strand, domestic working condition also can't guarantee accurately to process parabola taper at present; Italy's self adaptation crystallizer is to the transformation and the control more complicated of a cold water jacket.
Inventor of the present utility model discovers by a large amount of theories and production practices: the shrinkage curve of base shell as shown in Figure 1 in the casting process, as can be seen, in the effective section of crystallizer molten steel arrival end 0～150mm length, the contraction phase of base shell is to smaller, the base shell begins a large amount of contractions in 150mm～400mm scope, and the base shell shrinks and reduces to begin progressively to stablize afterwards.This base shell shrinkage curve on the crystallizer effective length and not exclusively with prior art in parabola taper coincide, also discovery in the practice, this tapering curve adopts three taperings or polynomial curve fitting more appropriate.
Can think, do not take into full account the shrinkage character on the base shell cross section in the above patented technology, be illustrated in figure 2 as the strand cross section base shell shrinkage curve that inventor's research obtains, cross-sectional constriction curve undulate from crystallizer wall center to bight base shell as can be seen, especially the square or rectangular bloom at the heavy in section, the waveform performance of shrinkage curve is more remarkable.
The utility model content
For overcoming above-mentioned deficiency of the prior art, the solidification shrinkage of the vertical and cross section of base shell in the better match casting process, increase base shell specific heat load and solidify uniformity, the purpose of this utility model is to provide a kind of waveform wall surfaces high efficiency continuous casting crystallizer, relates in particular to tubular continuous casting mould square or the low resistance of billet withdrawal of the high pulling rate of rectangular bloom.
The purpose of this utility model is achieved through the following technical solutions
A kind of waveform wall surfaces continuous cast mold, described waveform wall surfaces continuous cast mold is a kind of side or rectangle continuous cast mold, it is characterized in that, described waveform wall surfaces continuous cast mold be one from metal bath pour into hold to the strand port of export be hollow square or rectangle die cavity, described die cavity cross section wall undulate curved surface.
The square continuous cast mold of a kind of waveform wall surfaces, it is characterized in that the waveform curved surface constitutes two wave periods by three crests and two troughs, intermediate peak is positioned at crystallizer wall center, and two troughs connect with 3 circular arcs between intermediate peak and two troughs about the intermediate peak symmetry.,
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that opposite position trough symmetry therebetween, the also asymmetry that can occur being offset between described adjacent two crests.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that described waveform curved surface interconnects by circular arc in the crystallizer bight, described crystallizer bight wall angle is an acute angle.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that described waveform curved surface interconnects by circular arc in the crystallizer bight, described crystallizer bight wall angle is the right angle.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that the vertical tangent plane of its die cavity is the continuous tapering curve of multinomial y=ax
3+ bx
2+ cx+d, wherein coefficient a, b, c and d are all determined by the specified point on the vertical effective length of crystallizer.X represents crystallizer effective length from top to bottom, and y represents the base shell amount of contraction of base shell at the x place.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that, the starting point of the continuous tapering curve of multinomial of the vertical tangent plane of described crystallizer begins to count from the meniscus cross section, and the cavity dimension of the above crystallizer part in meniscus cross section is identical with the meniscus section, be that crystallizer pours into and holds meniscus part zero draft or slightly up big and down small tapering, make things convenient for the insertion of mold gap.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that, a repeatedly calculating terminal point of the continuous tapering curve of multinomial of the vertical tangent plane of described crystallizer is positioned at 40～60% parts of the vertical total length of crystallizer, preferably 45 ~ 55% of the crystallizer total length, crystallizer remaining part tapering curve is that single tapering changes.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that, described waveform curved surface wall on the crystallizer longitudinal length along with above-mentioned tapering curve changes from top to bottom, the fluctuating range of waveform curved surface progressively reduces from maximum, repeatedly calculating final position until above-mentioned tapering curve, the waveform curved surface changes over the straight flange wall, to guarantee to obtain accurate casting billet surface shape.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that described crystallizer bight is the radii fixus round-corner transition, angle cross section and waveform wall surfaces connect into acute angle, to obtain lower resistance of billet withdrawal.
According to waveform wall surfaces continuous cast mold of the present utility model, it is characterized in that described crystallizer bight is cone of nulls degree on the crystallizer longitudinal length or less single tapering changes.
According to waveform wall surfaces continuous cast mold of the present utility model, demonstrated fully the contraction essence of solidified shell in the casting process, effectively overcome because bad base shell shrinks the air gap thermal resistance that causes, to improving base shell intensity of cooling and continuous casting pulling rate obvious benefit is arranged, meet the calculation requirement of high efficiency continuous casting development, have higher application and popularization value.
The simple declaration of accompanying drawing
Fig. 1 is the shrinkage curve of base shell on the crystallizer effective length of the present utility model;
Fig. 2 is the cross-sectional constriction curve of crystallizer wall of the present utility model center to the bight;
Fig. 3 is the square crystallizer die cavity of the waveform wall surfaces of a crystallizer of the present utility model vertical view;
Fig. 4 is the vertical AA profile of above-mentioned waveform wall surfaces crystallizer die cavity.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 3, the square continuous cast mold of a kind of waveform wall surfaces shown in Figure 4 relate in particular to the high efficiency continuous casting crystallizer of square billet or rectangular bloom.It comprises that a metal bath pours into the hollow square or the rectangle die cavity 3 of the end 1 and the strand port of export 2, die cavity wall 4 is the waveform curved surface, interconnect by transition arc 7, the wall angle that waveform wall surfaces 4 forms in the crystallizer bight is acute angle or right angle, preferably acute angle.Waveform wall surfaces 4 is the one dimension heat dissipation interface, and the shrinkage curve that its waveform curved surface 4 can better match base shell reduces because the base shell shrinks the air gap thermal resistance that causes, and strengthens intensity of cooling, thereby can improve the continuous casting pulling rate.The bight of crystallizer is two-dimentional heat dissipation interface, and the base shell shrinks in the bight at first, and the crystallizer angle is single tapering from top to bottom and changes, and match base shell is in the contraction in bight.Waveform wall surfaces 4 acutangulates or the right angle with the wall angle that transition arc 7 forms, and helps evenly solidifying in the whole base shell mould chamber, and being formed with to be beneficial to of wall acute angle reduces resistance of billet withdrawal.
Waveform curved surface 4 forms two wave periods by three crests and two troughs, crest 10 is positioned at the center of waveform wall surfaces 4 in the middle of it, two troughs 11 are about intermediate peak 10 symmetries, connect with 3 circular arcs between intermediate peak 10 and two troughs 11, radial distance between intermediate peak 10 and two troughs 11, promptly wave amplitude 12.The ratio of crystallizer cavity dimension 19 that wave amplitude 12 accounts for plane 15 correspondences at the crystallizer port of export 2 places is 0.5～3%, preferably 1～2%.
Distance between described crystallizer crest and the trough, promptly amplitude 12, are in the crystallizer cambered surface and are in the amplitude of facing directly 12 ' to equate, also can be bigger by 10～30% than straight flange amplitude 12 '.
Distance between two troughs 11 of waveform curved surface 4 accounts for 40～60% of whole crystallizer wall face width degree, preferably accounts for 50%, can be about being in trough symmetry therebetween, the also asymmetry that can occur being offset between promptly adjacent two crests.
Described crystallizer wall angle is acute angle or right angle, and preferred angle is 85～90 °.
Described crystallizer waveform curved surface 4 in the crystallizer effective length from top to bottom along tapering curve y=ax
3+ bx
2+ cx+d changes, and described a, b, c and d determine according to the base shell amount of contraction on the crystallizer length-specific.Be divided into 20,21,22 and 23 totally four sections on the crystallizer longitudinal length illustrated in fig. 5.The cross section 17 of the terminal point correspondence of length of mould 20 is molten steel meniscus cross section, and the length 21 base shells of molten steel meniscus cross section about 100～150mm below 17 begin to form, and breaks under the molten steel static pressure effect and then form.The base shell mainly undergoes phase transition contraction in length 21, the amount of contraction of comparing is smaller.The base shell begins a large amount of Solid State Contraction in length 22, amount of contraction is relatively milder again in the length 23 afterwards.For considering the characteristics of processing and manufacturing, general the measure-alike of wall size and meniscus cross section 17 that keep promptly adopts cone of nulls degree or up big and down small slightly tapering in the length 20 in the length 20, makes things convenient for the insertion of submersed nozzle.
Described waveform curved surface 4 is faced directly along with the tapering curve tapers in length of mould 20,21 and 22, and promptly at a repeatedly calculating terminal point of tapering curve, the waveform curved surface changes straight flange cross section 14 into, its straight flange straight flange 5 as shown in Figure 3.The tapering curve changes with single tapering in length 23, and its multinomial high-order term coefficient is zero, and changing terminal point is cross section 15.Corresponding straight flange straight flange 2 as shown in Figure 3 (port of export 2) is to guarantee the form dimension of strand.
Described length of mould 20,21 and 22 sums account for 40 ~ 60% of whole length of mould, and preferred proportion is 45 ~ 55%.
The cavity dimension of described crystallizer arrival end 1 and the port of export 2 correspondences is respectively 18 and 19, because the linear side dimension that has arrival end 1 18 of tapering curve is bigger by 1～6% than port of export size 19, and preferably 2 ~ 4%.
Described crystallizer bight is interconnected by transition arc 7, and presses cone of nulls degree or the variation of single tapering, and tapering is identical with existing traditional single tapering crystallizer.
In the present embodiment, described conical degree of crystallizer curve is corresponding to length of mould 700～1100mm.
The utility model carries out embodiment explanation with square base, does not represent the utility model only to use square base, and the while also is applicable to the requirement of rectangular bloom etc.
The square continuous cast mold of a kind of waveform wall surfaces of the utility model, demonstrated fully the contraction essence of solidified shell in the casting process, effectively overcome because bad base shell shrinks the air gap thermal resistance that causes, to improving base shell intensity of cooling and continuous casting pulling rate obvious benefit is arranged, meet the specification requirement of high efficiency continuous casting development, have higher application and popularization value.
Claims (9)
1. waveform wall surfaces continuous cast mold, described waveform wall surfaces continuous cast mold is a kind of side or rectangle continuous cast mold, it is characterized in that, described waveform wall surfaces continuous cast mold be one from metal bath pour into hold to the strand port of export be hollow square or rectangle die cavity, described die cavity cross section wall undulate curved surface.
2. waveform wall surfaces continuous cast mold as claimed in claim 1, it is characterized in that, described waveform curved surface constitutes two wave periods by three crests and two troughs, intermediate peak is positioned at crystallizer wall center, and two troughs connect with 3 circular arcs between intermediate peak and two troughs about the intermediate peak symmetry.
3. waveform wall surfaces continuous cast mold as claimed in claim 2 is characterized in that, between described adjacent two crests to being in trough symmetry or asymmetry therebetween.
4. waveform wall surfaces continuous cast mold as claimed in claim 1 is characterized in that, described waveform curved surface interconnects by circular arc in the crystallizer bight, and described crystallizer bight wall angle is an acute angle.
5. waveform wall surfaces continuous cast mold as claimed in claim 1 is characterized in that, described waveform curved surface interconnects by circular arc in the crystallizer bight, and described crystallizer bight wall angle is the right angle.
6. waveform wall surfaces continuous cast mold as claimed in claim 1 is characterized in that, vertical tangent plane of described die cavity is the continuous tapering curve of multinomial y=ax
3+ bx
2+ cx+d, wherein coefficient a, b, c and d determine that by the regulation point on the vertical effective length of crystallizer x represents crystallizer effective length from top to bottom, y represents the base shell amount of contraction of base shell at the x place.
7. waveform wall surfaces continuous cast mold as claimed in claim 6, it is characterized in that, the starting point of the continuous tapering curve of multinomial of the vertical tangent plane of described crystallizer begins to count from the meniscus cross section, and the cavity dimension of the above crystallizer part in meniscus cross section is identical with the meniscus section; A repeatedly calculating terminal point of the continuous tapering curve of multinomial of the vertical tangent plane of described crystallizer is positioned at 40～60% parts of the vertical total length of crystallizer, and crystallizer remaining part tapering curve is that single tapering changes.
8. waveform wall surfaces continuous cast mold as claimed in claim 7, it is characterized in that, described waveform curved surface wall on the crystallizer longitudinal length along with above-mentioned tapering curve changes from top to bottom, the fluctuating range of waveform curved surface progressively reduces from maximum, until a repeatedly calculating final position of above-mentioned tapering curve, the waveform curved surface becomes the straight flange wall.
9. waveform wall surfaces continuous cast mold as claimed in claim 4 is characterized in that, described crystallizer bight is the radii fixus round-corner transition, and angle cross section and waveform wall surfaces connect into acute angle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200679515U CN201357216Y (en) | 2009-02-23 | 2009-02-23 | Continuous casting crystallizer for wave-shaped wall surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200679515U CN201357216Y (en) | 2009-02-23 | 2009-02-23 | Continuous casting crystallizer for wave-shaped wall surface |
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| CN201357216Y true CN201357216Y (en) | 2009-12-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624990A (en) * | 2015-02-26 | 2015-05-20 | 周嘉平 | Even-cooling crystallizer copper tube and manufacturing method thereof |
| CN110523935A (en) * | 2019-09-30 | 2019-12-03 | 马鞍山钢铁股份有限公司 | Mold copper plate of slab continuous casting machine and using method thereof |
| WO2020057647A1 (en) * | 2018-09-20 | 2020-03-26 | 中冶赛迪工程技术股份有限公司 | Copper tube of exponential function crystallizer |
-
2009
- 2009-02-23 CN CNU2009200679515U patent/CN201357216Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624990A (en) * | 2015-02-26 | 2015-05-20 | 周嘉平 | Even-cooling crystallizer copper tube and manufacturing method thereof |
| CN104624990B (en) * | 2015-02-26 | 2023-08-25 | 周嘉平 | A uniformly cooled crystallizer copper tube and its manufacturing method |
| WO2020057647A1 (en) * | 2018-09-20 | 2020-03-26 | 中冶赛迪工程技术股份有限公司 | Copper tube of exponential function crystallizer |
| CN110523935A (en) * | 2019-09-30 | 2019-12-03 | 马鞍山钢铁股份有限公司 | Mold copper plate of slab continuous casting machine and using method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20160223 |
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| CF01 | Termination of patent right due to non-payment of annual fee |