CN116000257A - Device and method for large-reduction of sector section of slab - Google Patents
Device and method for large-reduction of sector section of slab Download PDFInfo
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- CN116000257A CN116000257A CN202211135615.6A CN202211135615A CN116000257A CN 116000257 A CN116000257 A CN 116000257A CN 202211135615 A CN202211135615 A CN 202211135615A CN 116000257 A CN116000257 A CN 116000257A
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- 238000005266 casting Methods 0.000 claims description 36
- 238000006073 displacement reaction Methods 0.000 claims description 25
- 230000000881 depressing effect Effects 0.000 claims description 7
- 239000007790 solid phase Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 16
- 238000007711 solidification Methods 0.000 description 5
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- 238000009851 ferrous metallurgy Methods 0.000 description 1
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Abstract
The invention provides a device and a method for large-pressure reduction of a sector section of a plate blank, comprising the following steps: a pressing roller and a pressing control device; the pressing roller comprises at least two pairs of driving rollers and a pair of free rollers arranged between the adjacent driving rollers; each pair of driving rollers comprises an upper driving roller and a lower driving roller, and each pair of free rollers comprises an upper free roller and a lower free roller; each pair of driving rollers is connected with a transmission device, and the upper driving roller and the lower driving roller are driven to rotate through the transmission device; the pressing control device includes a first pressing cylinder provided on the upper driving roller and a second pressing cylinder provided on the upper free roller. The invention can solve the problems of high precision requirement on the pressing position, high requirement on the frame bearing force of the sector section, easy bulge occurrence and the like of the current large pressing technology of the sector section of the plate blank.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a device and a method for large-pressure reduction of a sector section of a plate blank.
Background
In order to solve the problem of central looseness of the slab, a smaller compression ratio is adopted to produce the thick plate, and large reduction is carried out on the casting blank in the continuous casting process at home and abroad. To implement this technique, work is done on the basis of existing slab segments. One method is to increase the rigidity of the sector body, increase the clamping cylinder capacity of the sector, and use the whole sector to implement large rolling reduction. Another approach is to perform the pressing by a pair of rollers in the sector, which have a large roller diameter to avoid deformation of the rollers.
At present, when the sector sections are under large pressure, more problems and disadvantages exist:
1) Because the rolling reduction is large, generally 10-15 mm, the frame of the sector section is stressed greatly, thousands of tons are reached, the precision of the frame is difficult to ensure by the conventional structure, and permanent deformation can occur after a period of use;
2) When one pair of rolls is used for pressing, the pressing position needs to be very accurate, but the solidification end point of the segment tends to vary greatly. The scheme is that the rolling position is usually at the basically full solidification of the casting blank, so that the rolling force is large, and the selected roller diameter is generally about 700mm for avoiding deformation;
3) Because the roller diameter is very big, the roll gap is also great before and after, when the pull rate is higher, appears bulging easily, leads to the appearance of crackle, therefore the suitability of this kind of scheme is not strong.
In conclusion, the problems of high precision requirement on the pressing position, high requirement on the bearing capacity of the frame of the sector section, easiness in bulging and the like in the prior art are solved.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a device and a method for large-pressing a segment of a slab, so as to solve the problems of high accuracy requirement on pressing position, high requirement on frame bearing force of the segment, and easy bulging in the existing large-pressing technology of the segment of the slab.
The invention provides a large-pressure device for a sector section of a plate blank, which comprises: a pressing roller and a pressing control device; wherein the pressing roller includes at least two pairs of driving rollers and a pair of free rollers disposed between the adjacent driving rollers; each pair of driving rollers comprises an upper driving roller and a lower driving roller, and each pair of free rollers comprises an upper free roller and a lower free roller; each pair of driving rollers is connected with a transmission device, and the upper driving rollers and the lower driving rollers are driven to rotate through the transmission device; the pressing control device comprises a first pressing cylinder arranged on the upper driving roller and a second pressing cylinder arranged on the upper free roller.
Further, it is preferable that the pressing roller includes three pairs of driving rollers and two pairs of free rollers.
In addition, the preferable scheme is that the roller diameter of the driving roller is 400-450 mm; and/or the roller diameter of the free roller is 400-450 mm.
In addition, the pressure values of the driving roller and the free roller are preferably 200-300 tons.
Further, it is preferable that the first pressing cylinders are provided at both ends of each pair of driving rollers; and/or the second pressing cylinders are arranged at two ends of each pair of free rollers.
In addition, it is preferable that a first displacement sensor is provided in the first pressing cylinder; the upper driving roller presses down the sector section of the casting blank through the moving displacement value obtained by the first displacement sensor; and/or a second displacement sensor is arranged in the second pressing cylinder; and the upper free roller applies pressing to the fan-shaped section of the casting blank through the moving displacement value obtained by the second displacement sensor.
In addition, it is preferable that a first position pressure sensor is provided in the first pressing cylinder; the upper driving roller presses down the fan-shaped section of the casting blank through the pressure value obtained by the first pressure sensor; and/or a second pressure sensor is arranged in the second pressing cylinder; and the upper free roller applies reduction to the fan-shaped section of the casting blank through the pressure value obtained by the second position pressure sensor.
Further, it is preferable that the distance between the adjacent driving roller and the free roller is 430 to 480mm.
The invention provides a large-reduction method for a plate blank sector, which utilizes the large-reduction device for the plate blank sector to carry out large reduction on the plate blank sector, and comprises the following steps:
according to the interval position of the solid phase ratio of the casting blank of 0.3-0.8, determining the blank pulling resistance of the sector section large-reduction device of the slab under large reduction;
determining an initial value of the transmission device according to the blank pulling resistance, and finishing the large depression of the sector section of the plate blank; when the reduction rollers for carrying out large reduction on the sector section of the casting blank are any pair of driving rollers, the transmission devices connected with the remaining driving rollers provide pressure for the blank drawing resistance together, and the free rollers without carrying out large reduction adopt hot blank reduction on the casting blank; when the reduction rolls, which carry out a high reduction on the segment of the cast strand, are free rolls, the drive means connected by the drive rolls together provide pressure for the withdrawal resistance.
In addition, preferably, the calculation formula of the blank drawing resistance applied by the sector section large-pressure device of the slab under large pressure is as follows: f=2σδ (2 Rh-h) 2 )/R；
Wherein sigma is average deformation resistance, and delta is thickness of the casting blank; r is the radius of the reduction roller; h is half of the reduction, and F is 1 pair of the resistance to the pulling of the blank by the reduction.
According to the technical scheme, the large rolling device and the large rolling method for the plate blank sector are characterized in that at least two pairs of driving rollers and free rollers arranged between adjacent driving rollers are arranged on the plate blank sector, and each pair of rolling rollers is independently provided with a rolling cylinder, so that each pair of rolling rollers can independently conduct rolling; unlike conventional sector section with only one pair of driving rollers, the present invention has at least two pairs of driving rollers for great blank drawing resistance, and one pair of driving rollers for great blank drawing resistance is adopted to avoid blank stagnation.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic structural view of a segment large-reduction device of a slab according to an embodiment of the present invention;
FIG. 2 is a schematic view of a drive roller according to an embodiment of the present invention;
fig. 3 is a schematic view showing a structure in which a pressing roller is connected to a transmission device according to an embodiment of the present invention.
Fig. 4 is a flow chart of a method for large-draft segment of a slab according to an embodiment of the present invention.
In the figures, 1-drive roller, 11-upper drive roller, 12-lower drive roller, 2-free roller, 21-upper free roller, 22-lower free roller, 3-transmission, 41-first depressing cylinder, 42-second depressing cylinder.
In the drawings, like reference numerals designate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems that the prior art for large pressing of slab sector has high precision requirement on pressing position, high frame bearing force requirement on sector, easy bulging phenomenon and the like, the invention provides a device and a method for large pressing of slab sector.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the device and the method for large-reduction of the sector section of the slab, fig. 1 shows the structure of the device for large-reduction of the sector section of the slab according to the embodiment of the invention; fig. 2 shows a structure of a driving roller according to an embodiment of the present invention; fig. 3 shows a structure in which a pressing roller is connected to a transmission according to an embodiment of the present invention. Fig. 4 shows a flow of a segment large-pressing method of a slab according to an embodiment of the present invention.
As shown in fig. 1 to 4 together, the present invention provides a large-pressure device for a segment of a slab, comprising: a pressing roller and a pressing control device; wherein the pressing roller includes at least two pairs of driving rollers 1 and a pair of free rollers 2 disposed between the adjacent driving rollers 1; each pair of driving rollers 1 includes an upper driving roller 11 and a lower driving roller 12, and each pair of free rollers 2 includes an upper free roller 21 and a lower free roller 22; each pair of driving rollers 1 is connected with a transmission device 3, and the upper driving roller 11 and the lower driving roller 12 are driven to rotate by the transmission device 3; the depressing control means includes a first depressing cylinder 41 provided on the upper driving roller 11 and a second depressing cylinder 42 provided on the upper free roller 21.
The roller diameter of each single pressing roller can be reduced due to the cooperation of a plurality of pairs of pressing rollers, the roller spacing between the adjacent pressing rollers is smaller, the occurrence of bulging is effectively avoided, the pressing can be implemented in the interval range of the solid phase rate, and the required pressing force is smaller due to incomplete solidification of a casting blank, so that the rigidity requirement on the frame of the sector section is reduced; unlike conventional sector section with only one pair of driving rollers, the present invention has at least two pairs of driving rollers 1 for great blank drawing resistance, and one pair of driving rollers is used for great blank drawing, and the driving rollers 1 or the free rollers 2 are used for single roller drawing to provide great driving force to avoid blank stagnation.
As a preferred embodiment of the present invention, the pressing roller includes three pairs of driving rollers 1 and two pairs of free rollers 2. From the preferred scheme not in the invention, 5 pairs of pressing rollers are adopted, wherein three pairs of driving rollers 1 and two pairs of free rollers 2 can achieve the optimal combination effect, and meanwhile, the occupied space is more reasonable.
As a preferable embodiment of the present invention, the roller diameter of the driving roller 1 is 400 to 450mm; and/or the roller diameter of the free roller 2 is 400-450 mm. The roller diameters of the driving tube 1 and the free roller 2 are smaller than those of a stack of driving rollers in the prior art, and the small roller diameter is beneficial to reducing the roller spacing between adjacent rollers and avoiding the phenomenon of bulging.
The pressure values of the driving roller 1 and the free roller 2 are 200-300 tons. The pressure value is smaller than that of the frame of the sector section by adopting a pair of driving rollers, so that damage to the frame of the sector section is avoided.
As a preferable aspect of the present invention, first pressing cylinders 41 are provided at both ends of each pair of driving rollers 1; and/or second pressing cylinders 42 are provided at both ends of each pair of free rolls 2. The two ends of the pressing roller can be pressed down simultaneously, and the pressing effect is better. Each pair of reduction rolls can be controlled to perform individual reduction.
As a preferable aspect of the present invention, a first displacement sensor is provided in the first pressing cylinder 41; the upper driving roller 11 presses down the sector section of the casting blank through the moving displacement value obtained by the first displacement sensor; and/or a second displacement sensor is provided in the second depressing cylinder 42; the upper free rolls 21 apply reduction to the segment of the cast slab by the displacement value of the movement acquired by the second displacement sensor. The reduction displacement value of the reduction roller can be transmitted by the sensor, and then the reduction operation of the reduction roller is controlled according to the reduction displacement value.
As a preferable aspect of the present invention, a first position pressure sensor is provided in the first pressing cylinder 41; the upper driving roller 11 presses down the sector section of the casting blank through the pressure value obtained by the first pressure sensor; and/or a second pressure sensor is provided in the second pressing cylinder 42; the upper free rolls 21 apply a reduction to the segments of the cast slab by means of the pressure values obtained by the second pressure sensor. The control of the pressing process of the pressing roller can also be completed by setting the pressure value. The pressure sensor and the displacement sensor can be arranged in the pressing cylinder at the same time, so that a double control mode of pressure and displacement is realized.
As a preferable embodiment of the present invention, the distance between the adjacent driving roller 1 and the free roller 2 is 430 to 480mm. The smaller distance can effectively avoid the appearance of the belly.
The invention provides a large-reduction method for a plate blank sector, which utilizes the large-reduction device for the plate blank sector to carry out large reduction on the plate blank sector, and comprises the following steps:
s1, determining the blank pulling resistance of a sector section large-reduction device of a plate blank under large reduction according to the interval position of the solid phase ratio of the blank between 0.3 and 0.8;
s2, determining an initial value of a transmission device according to the blank pulling resistance, and finishing the large depression of the sector section of the plate blank; when the reduction rollers for carrying out large reduction on the sector section of the casting blank are any pair of driving rollers, the transmission devices connected with the rest driving rollers provide pressure for drawing resistance together, and the free rollers without carrying out large reduction adopt hot blank reduction on the casting blank; when the reduction rolls, which carry out a high reduction on the segment of the cast strand, are free rolls, the drive connected by the drive rolls together provide pressure for the withdrawal resistance.
The segment of the present invention employs at least two pairs of drive rollers 1. When the pressing is performed, only one pair of pressing rollers is used for large pressing. When the single-roller reduction is carried out by adopting the driving roller 1 or the free roller 2 according to the change of the solid phase rate of the center of the casting blank, the other driving rollers 1 give corresponding pressure so as to provide enough driving force and avoid the phenomenon of blank stagnation.
As a preferable scheme of the invention, the calculation formula of the blank drawing resistance applied by the sector section large-pressure device of the plate blank under large pressure is as follows：F＝2σδ(2Rh-h 2 )/R；
Wherein sigma is average deformation resistance, and delta is thickness of the casting blank; r is the radius of the reduction roller; h is half of the reduction, and F is 1 pair of the resistance to the pulling of the blank by the reduction.
The following examples are presented to further illustrate the invention so that those skilled in the art may better understand the advantages and features of the invention.
Example 1
As shown in fig. 1-3, the roller diameters of the driving roller 1 and the free roller 2 are 400-450 mm, and the sectional roller structure is adopted, so that the roller deformation is small when large reduction is implemented, and the casting blank reduction effect is better. Each pair of pressing rollers can implement 200-300 tons of pressing force, each pair of pressing rollers is provided with two pressing cylinders, and each pair of pressing rollers can implement independent pressing or pressure control by adopting displacement control. The displacement sensor is arranged in the pressing cylinder, the synchronous position and the position of the oil cylinders at two sides are controlled by adopting the proportional valve, the roll gap of the large pressing roll is controlled, and the large pressing is carried out on the casting blank. The upper cavity and the lower cavity of the pressing cylinder are respectively provided with a pressure sensor, and the pressing cylinder can control the pressure through a proportional valve of a hydraulic system. The sector is provided with three pairs of transmission means 3.
In continuous casting engineering, according to the thickness of a casting blank and the steel type, a casting blank solidification model calculates the solidification process of the casting blank according to the molten steel condition, the water quantity of a crystallizer, the secondary cooling water quantity and other factors. And in the interval of 0.3-0.8 of the central solid phase ratio of the casting blank, a pair of reduction rollers adopts displacement control, and the casting blank is subjected to 10-15 mm large reduction. The other free roller 2 which is not pressed is pressed by adopting smaller hot blank pressure, so that the belly is prevented from being bulged. The other driving rollers 1 calculate the generated blank drawing resistance according to whether the rollers which are subjected to large reduction are provided with the transmission device 3, the reduction amount, the thickness of a casting blank and the like, and then the corresponding friction force is obtained by adopting certain pressure reduction so as to provide enough driving force to help blank drawing.
The large reduction sector section adopts five large reduction rollers which are independently controlled, and when the casting blank is not completely solidified, the small pressure can be used for implementing 10-15 mm large reduction on the casting blank, so that the improvement effect of the central looseness of the casting blank is ensured. The roller spacing is smaller, so that the fan-shaped section has a larger pull speed adaptation range without the problem of belly bulging. With three pairs of driving rollers 1 it is ensured that the segments provide a sufficiently large driving force, whether or not the rollers under high pressure are provided with a belt drive 3.
According to the large rolling device and the large rolling method for the plate blank segment, provided by the embodiment of the invention, at least two pairs of driving rollers and free rollers arranged between the adjacent driving rollers are arranged on the plate blank segment, and each pair of rolling rollers is independently provided with a rolling cylinder, so that each pair of rolling rollers can independently implement rolling; unlike conventional sector section with only one pair of driving rollers, the present invention has at least two pairs of driving rollers for great blank drawing resistance, and one pair of driving rollers for great blank drawing resistance is adopted to avoid blank stagnation.
The sector-shaped section large-reduction device and method of the slab according to the present invention are described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the segment high-pressure reduction apparatus and method of slab set forth in the present invention described above without departing from the spirit of the invention. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A device for large depressing of a segment of a slab, comprising: a pressing roller and a pressing control device; wherein,,
the pressing roller comprises at least two pairs of driving rollers and a pair of free rollers arranged between the adjacent driving rollers; each pair of driving rollers comprises an upper driving roller and a lower driving roller, and each pair of free rollers comprises an upper free roller and a lower free roller;
each pair of driving rollers is connected with a transmission device, and the upper driving rollers and the lower driving rollers are driven to rotate through the transmission device;
the pressing control device comprises a first pressing cylinder arranged on the upper driving roller and a second pressing cylinder arranged on the upper free roller.
2. The slab sector high-pressure reduction device according to claim 1, wherein,
the pressing roller includes three pairs of driving rollers and two pairs of free rollers.
3. The slab sector high-pressure reduction device according to claim 1, wherein,
the roller diameter of the driving roller is 400-450 mm; and/or the number of the groups of groups,
the roller diameter of the free roller is 400-450 mm.
4. The slab sector high-pressure reduction device according to claim 1, wherein,
the pressure values of the driving roller and the free roller are 200-300 tons.
5. The slab sector high-pressure reduction device according to claim 1, wherein,
the first pressing cylinders are arranged at two ends of each pair of driving rollers; and/or the number of the groups of groups,
the second pressing cylinders are arranged at two ends of each pair of free rollers.
6. The slab sector high-pressure reduction device according to claim 1, wherein,
a first displacement sensor is arranged in the first pressing cylinder; the upper driving roller presses down the sector section of the casting blank through the moving displacement value obtained by the first displacement sensor; and/or the number of the groups of groups,
a second displacement sensor is arranged in the second pressing cylinder; and the upper free roller applies pressing to the fan-shaped section of the casting blank through the moving displacement value obtained by the second displacement sensor.
7. The slab sector high-pressure reduction device according to claim 1 or 6, characterized in that,
a first pressure sensor is arranged in the first pressing cylinder; the upper driving roller presses down the fan-shaped section of the casting blank through the pressure value obtained by the first pressure sensor; and/or the number of the groups of groups,
a second pressure sensor is arranged in the second pressing cylinder; and the upper free roller applies reduction to the fan-shaped section of the casting blank through the pressure value obtained by the second position pressure sensor.
8. The slab sector high-pressure reduction device according to claim 1, wherein,
the distance between the adjacent driving roller and the free roller is 430-480 mm.
9. A method for large-pressing a segment of a slab, characterized in that the segment of the slab is large-pressed by the segment large-pressing device of the slab according to any one of claims 1 to 8, comprising the steps of:
according to the interval position of the solid phase ratio of the casting blank of 0.3-0.8, determining the blank pulling resistance of the sector section large-reduction device of the slab under large reduction;
determining an initial value of the transmission device according to the blank pulling resistance, and finishing the large depression of the sector section of the plate blank; when the reduction rollers for carrying out large reduction on the sector section of the casting blank are any pair of driving rollers, the transmission devices connected with the remaining driving rollers provide pressure for the blank drawing resistance together, and the free rollers without carrying out large reduction adopt hot blank reduction on the casting blank; when the reduction rolls, which carry out a high reduction on the segment of the cast strand, are free rolls, the drive means connected by the drive rolls together provide pressure for the withdrawal resistance.
10. The method of large depression of a segment of a slab according to claim 9, wherein,
the calculation formula of the blank pulling resistance of the sector section large-pressing device of the slab under large pressing is as follows: f=2σδ (2 Rh-h) 2 )/R；
Wherein sigma is average deformation resistance, and delta is thickness of the casting blank; r is the radius of the reduction roller; h is half of the reduction, and F is 1 pair of the resistance to the pulling of the blank by the reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211135615.6A CN116000257A (en) | 2022-09-19 | 2022-09-19 | Device and method for large-reduction of sector section of slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211135615.6A CN116000257A (en) | 2022-09-19 | 2022-09-19 | Device and method for large-reduction of sector section of slab |
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| CN116000257A true CN116000257A (en) | 2023-04-25 |
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| CN202211135615.6A Pending CN116000257A (en) | 2022-09-19 | 2022-09-19 | Device and method for large-reduction of sector section of slab |
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| CN (1) | CN116000257A (en) |
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