CN211803726U - Double-roller ultrathin strip continuous casting pouring water distribution flow port - Google Patents
Double-roller ultrathin strip continuous casting pouring water distribution flow port Download PDFInfo
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- CN211803726U CN211803726U CN201921688917.XU CN201921688917U CN211803726U CN 211803726 U CN211803726 U CN 211803726U CN 201921688917 U CN201921688917 U CN 201921688917U CN 211803726 U CN211803726 U CN 211803726U
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Abstract
The utility model relates to a two ultra-thin area continuous casting pouring water distribution water gaps of roller, including lateral wall and terminal surface, lateral wall and terminal surface enclose into and hold the chamber, the lateral wall bottom is equipped with a plurality of steel holes, the steady flow groove is seted up with the position that the tapping hole flushed bottom the lateral wall outside, steady flow groove and tapping hole UNICOM. After the steady flow groove is arranged, the molten steel flowing out of each separated steel outlet hole can not directly flow into the weld puddle, but transversely flow in the steady flow groove firstly, and then flow into the weld puddle after being mixed. Because the temperature of the molten steel in the steady flow groove is reduced slowly and has little difference with the temperature of the molten steel in the steel tapping hole, the temperature difference is almost not existed after the molten steel is mixed in the steady flow groove, the molten steel flowing into the weld puddle is not stranded any more, and the non-uniform degree of the molten steel distribution is reduced.
Description
Technical Field
The utility model relates to a function refractory material field is used in the continuous casting, especially relates to a two roller ultra-thin area continuous casting pouring water distribution mouths.
Background
The twin-roll thin strip continuous casting technology is a leading-edge technology in the modern metallurgical industry, high-temperature molten metal can be directly cast and rolled into a thin strip steel plate, the cast and rolled thickness can reach the range of 0.1mm-10mm, the production flow of hot strip steel is greatly shortened, and the technology is the shortest hot strip steel production technology at present. The thin strip continuous casting process is a sub-rapid solidification process of metal, and can become an important solution for solving the most troublesome problems of plasticity, segregation, inclusion, uniformity, energy consumption and the like in the processing of high alloy materials.
The twin-roll strip casting process is different from and related to the conventional continuous casting process, and the process is that the molten metal in a tundish is distributed into a crystallization container consisting of a crystallizer and a side sealing plate through a submerged distribution water port to form a weld puddle, as shown in fig. 1, the molten metal with high temperature is gradually solidified on the surface of a rotating crystallization roll, and the molten metal is extruded to form the metal strip. The quality of the thin strip product is directly related to the state of a flow field in the weld pool, the distribution of a temperature field, the fluctuation of a liquid level and the purity of molten steel.
For example, the water distribution devices disclosed in application numbers 201711121376.8 and 20181004656548 are all that side nozzles are horizontally and uniformly arranged in a single row or multiple rows at intervals, as shown in fig. 2 and 3, molten steel is divided into multiple strands to flow out from the nozzles arranged at intervals, and then the molten steel is mixed after flowing out. When molten steel flowing out of the tap hole is mixed, the molten steel at a position aligned with the tap hole flows fast, the temperature of the molten steel is high, the molten steel at a position not aligned with the tap hole flows slow, the molten steel is easy to cool, and the temperature is low. This causes the temperature distribution of the molten steel in the puddle to form a striped distribution, and the thickness of the metal strip formed after cooling by the crystallization rolls also fluctuates in a striped manner. FIG. 4 is a graph showing the results of thickness inspection of an ultra thin strip produced at the nozzle, in which a thin strip steel plate has a standard thickness of 0.8mm and a width of 100cm and 10 tap holes are uniformly spaced. As can be seen from the figure, the steel strip is thicker at the position near the tap-holes, while the position between the adjacent tap-holes shows striations of smaller thickness, with a height of about 0.002cm and a difference of about 2% -2.5%. In an environment where the requirement for uniformity of the thickness of the steel strip is high, such a difference in thickness has an influence on the product quality.
The current distributor that application number is 201610930886.9 announced drives molten steel inclusion come-up through inert gas, but whole homogeneity is not enough, still partly molten steel inclusion along with through-hole torrent get into in the weld puddle.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to provide a two roller ultra-thin strip continuous casting pouring water distribution mouths can reduce the phenomenon that the temperature distribution of molten steel forms the distribution of stripe in the weld pool to reduce the fluctuation of the stripe of thin strip thickness of metal.
In order to solve the technical problem, the utility model discloses a two roller ultra thin strip continuous casting pouring water distribution water gap, including lateral wall and terminal surface, lateral wall and terminal surface enclose into and hold the chamber, the lateral wall bottom is equipped with a plurality of steel holes, the steady flow groove is seted up with the position that the tapping hole flushed to lateral wall outside bottom, steady flow groove and tapping hole UNICOM. After the steady flow groove is arranged, the molten steel flowing out of each separated steel outlet hole can not directly flow into the weld puddle, but transversely flow in the steady flow groove firstly, and then flow into the weld puddle after being mixed. Because the temperature of the molten steel in the steady flow groove is reduced slowly and has little difference with the temperature of the molten steel in the steel tapping hole, the temperature difference is almost not existed after the molten steel is mixed in the steady flow groove, the molten steel flowing into the weld puddle is not stranded any more, and the non-uniform degree of the molten steel distribution is reduced.
The width of the flow stabilizing groove is larger than the diameter of the steel outlet hole. After the molten steel flows out of the steel tapping hole and enters the steady flow groove, the width of the steady flow groove is increased, the flow speed of the molten steel is slowed down, and a flow field of the molten steel in the steady flow groove can generate vortex, so that the molten steel can be fully mixed in the steady flow groove.
The flow stabilizing groove comprises an inner cavity part on the inner side and an opening section arranged on the outer side. The width of the opening section is smaller than the width of the inner cavity part. The outlet on the outer side of the flow stabilizing groove is narrowed, molten steel can be more fused in the inner cavity part, the flow speed of the opening section is increased, and the flow speed can be adjusted.
The width ratio of the inner cavity part to the adduction section is 1.5-2.5: 1.
The ratio of the total sectional area of the plurality of steel outlet holes, the sectional area of the inner cavity portion 81 and the sectional area of the opening section 82 may preferably be 1:4: 2.
The cavity is divided into an upper outer cavity and a lower flow stabilizing cavity, and a filter screen is arranged between the outer cavity and the flow stabilizing cavity.
The utility model discloses a cloth flowing water mouth tentatively forms a relatively stable flow field in the stationary flow intracavity, and the rethread through-hole slows down and evenly distributed to the molten steel once more in getting into the stationary flow groove.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of a structure of a casting system for twin roll strip casting.
Fig. 2 is a front view of a prior art water distribution spout.
Fig. 3 is a side view of a prior art water distribution spout.
Fig. 4 is a graph of the thickness inspection result of the ultra-thin strip produced by the distribution flow gate in the prior art.
Fig. 5 is a front view of the water distribution flow port in embodiment 1.
Fig. 6 is a side view of a water distribution flow port in embodiment 1.
Fig. 7 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution nozzle in example 1.
Fig. 8 is a front view of a water distribution flow port in embodiment 2.
Fig. 9 is a side view of a water distribution flow port in embodiment 2.
Fig. 10 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution flow gate in example 2.
Fig. 11 is a partially enlarged view of the stabilizer groove.
Fig. 12 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution nozzle in example 3.
Detailed Description
The dual-roller ultra-thin strip casting water distribution flow port is used on a casting system for dual-roller thin strip casting, as shown in fig. 1, the casting system for dual-roller thin strip casting comprises a water distribution flow port 1, a weld puddle 2 and a casting roller 3, the water distribution flow port 1 comprises two side walls 4 and two end surfaces 5, a cavity 6 is enclosed by the side walls 4 and the end surfaces 5, a plurality of steel outlet holes 7 are arranged at the bottom of the side walls 4, and molten steel flows into the weld puddle 2 from the water distribution flow port 1 through the steel outlet holes 7.
As shown in fig. 5 and fig. 6, the flow stabilizing groove 8 is provided at the position where the outer side of the bottom of the side wall 4 is flush with the steel tapping hole 7 at the double-roller ultra-thin strip continuous casting pouring water distribution flow hole of the present invention, the flow stabilizing groove 8 is communicated with the steel tapping hole 7, that is, the flow stabilizing groove 8 is a strip-shaped groove provided at the position where the outer side bottom of the side wall 4 is consistent with the height of the steel tapping hole 7, and the groove is parallel to the bottom of the side wall 4. The joint of the steady flow groove 8 and the tapping hole 7 can be provided with a round chamfer.
As shown in fig. 5, the receiving chamber 6 is divided into an upper outer chamber 61 and a lower flow stabilizing chamber 62, and a filter screen 10 is disposed between the outer chamber 61 and the flow stabilizing chamber 62.
In embodiment 1, as shown in fig. 5 and 6, the shape of the flow stabilizer groove 8 is a long-strip-shaped groove having a uniform width in the vertical direction. The molten steel flowing out of each separated steel outlet hole 7 does not directly flow into the weld pool 2, but a part of the molten steel flows transversely in the stabilizing trough 8, is mixed and then flows into the weld pool 2. Because the temperature of the molten steel in the steady flow groove 8 is reduced slowly and has almost no temperature difference with the temperature of the molten steel in the steel outlet hole 7, the molten steel is mixed in the steady flow groove 8, the temperature difference hardly exists, the molten steel flowing into the weld puddle 2 is not stranded, and the uneven degree of the molten steel distribution is reduced. FIG. 7 is a graph showing the results of thickness inspection of an ultra thin strip produced at a nozzle according to example 1, in which a thin strip steel plate has a standard thickness of 0.8mm and a width of 100cm and 10 tap holes are uniformly spaced. As can be seen from FIG. 7, the thickness of the ultra-thin strip is smaller than the thickness fluctuation shown in FIG. 4, and the position between the adjacent tap holes has stripes with smaller thickness, the height of the stripes is about 0.0006cm, the difference is about 0.5-0.75%, and the product quality is better.
The width of the steady flow groove 8 can be set to be larger than the diameter of the steel outlet hole 7.
In embodiment 2, as shown in fig. 8 and 9, the flow stabilization tank 8 includes an inner cavity portion 81 on the inner side and an opening section 82 provided on the outer side. The width of the open section 82 is less than the width of the inner cavity portion. The width of the open section 82 is smaller than the width of the inner cavity portion 81.
Although the strip-shaped distribution of the temperature change in the weld puddle 2 can be reduced after the flow stabilizing groove 8 is arranged, the flow stabilizing groove 8 can reduce the outflow speed of molten steel, so that the temperature gradient is generated on the upper surface of the molten steel in the weld puddle in the direction parallel to the water distribution port 1 and the casting rolls 3, and the uniformity of the steel strip is also influenced. The outlet on the outer side of the steady flow groove 8 is narrowed, on one hand, the molten steel can be more fused in the inner cavity part 81; on the other hand, the flow rate of the molten steel can be adjusted to be larger by the opening section 82, more stirring is generated in the weld puddle 2 after the molten steel flows out of the water gap, the distribution in the weld puddle is more uniform, and the temperature difference is small.
FIG. 10 is a graph showing the results of thickness inspection of an ultra thin strip produced at a nozzle according to example 2, in which a thin strip steel plate has a standard thickness of 0.8mm and a width of 100cm and 10 tap holes are uniformly spaced. As can be seen from fig. 10, the thickness of the ultra-thin band was smaller than the thickness fluctuation shown in fig. 4 and 7, and the positions between the adjacent tap holes showed small-thickness streaks having a height of about 0.0001cm and a difference of about 0.05-0.1%.
Through experiments, the width ratio of the inner cavity portion b and the opening section c can be suitably optimized. As shown in FIG. 11, the ratio of the width of the inner cavity portion b to the width of the opening section c is 1.5-2.5:1, and the ratio of the cross-sectional area of the inner cavity portion to the cross-sectional area of the opening section is also 1.5-2.5: 1. Most preferably 2:1, and in the third embodiment, the width ratio of the inner cavity part b to the opening section c is 2:1, and as can be seen from fig. 12, the thickness fluctuation of the ultra-thin strip is smaller, stripes with smaller thickness appear at the positions between the adjacent steel-tapping holes, the height of the stripes is about 0.0001cm, and the difference is about 0.05-0.07%.
The ratio of the total cross-sectional area of the plurality of steel outlet holes 7, the cross-sectional area of the inner cavity portion 81 and the cross-sectional area of the opening section 82 can be optimized, and is preferably 1:4: 2.
Claims (6)
1. The utility model provides a two roller ultra-thin strip continuous casting pouring water distribution water gap, includes lateral wall and terminal surface, lateral wall and terminal surface enclose into and hold the chamber, the lateral wall bottom is equipped with a plurality of steel outlet holes, its characterized in that: and a flow stabilizing groove is formed in the position, at which the bottom of the outer side of the side wall is flush with the steel tapping hole, and is communicated with the steel tapping hole.
2. The twin roll ultra thin strip casting pouring spout according to claim 1, characterized in that: the width of the flow stabilizing groove is larger than the diameter of the steel outlet hole.
3. The twin roll ultra thin strip casting pouring spout according to claim 1, characterized in that: the flow stabilizing groove comprises an inner cavity part on the inner side and an opening part arranged on the outer side, and the width of the inner cavity part is larger than that of the opening part.
4. The twin roll ultra thin strip casting pouring spout according to claim 3, characterized in that: the width ratio of the inner cavity part to the opening section is 2-2.5: 1.
5. The twin roll ultra thin strip casting pouring spout according to claim 3, characterized in that: the ratio of the sectional area of the plurality of steel outlet holes, the sectional area of the inner cavity part 81 and the sectional area of the opening section 82 is 1:4: 2.
6. The twin roll ultra thin strip casting pouring spout according to any one of claims 1 to 5, characterized in that: the cavity is divided into an upper outer cavity and a lower flow stabilizing cavity, and a filter screen is arranged between the outer cavity and the flow stabilizing cavity.
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| CN201921688917.XU CN211803726U (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
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| CN201921688917.XU CN211803726U (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756753A (en) * | 2019-10-10 | 2020-02-07 | 青岛正望钢水控制股份有限公司 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756753A (en) * | 2019-10-10 | 2020-02-07 | 青岛正望钢水控制股份有限公司 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
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Address after: 266200 No. 1, Zhengwang Road, Jimo environmental protection industrial park, Qingdao, Shandong Patentee after: Qingdao Zhengwang Material Co.,Ltd. Address before: 266200 No. 1, Zhengwang Road, Jimo environmental protection industrial park, Qingdao, Shandong Patentee before: QINGDAO HIWORLD MOLTEN STEEL CONTROL CO.,LTD. |
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