CN109550914B - Structure for increasing rigidity of continuous casting fan-shaped section - Google Patents
Structure for increasing rigidity of continuous casting fan-shaped section Download PDFInfo
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- CN109550914B CN109550914B CN201710876107.6A CN201710876107A CN109550914B CN 109550914 B CN109550914 B CN 109550914B CN 201710876107 A CN201710876107 A CN 201710876107A CN 109550914 B CN109550914 B CN 109550914B
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- inner arc
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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Abstract
The invention discloses a structure for increasing the rigidity of a continuous casting fan-shaped section, wherein an inner arc frame and an outer arc frame are arranged at intervals up and down in the structure, a continuous casting roller is arranged between the inner arc frame and the outer arc frame through a clamping and roller gap adjusting device, the structure also comprises a pre-stress mechanism and a pre-stress mechanism, the pre-stress mechanism is arranged above a neutral layer of the inner arc frame and enables the structure above the neutral layer of the inner arc frame to have compressive stress, and the pre-stress mechanism is arranged below the neutral layer of the inner arc frame and enables the structure below the neutral layer of the inner arc frame to have tensile stress. The structure solves the problems that the roll gap precision is lower and the process requirements cannot be met due to insufficient rigidity of the sector section caused by the increase of the reduction required by the continuous casting process in the prior art, thereby effectively improving the surface and internal quality of the casting blank.
Description
Technical Field
The invention belongs to the technical field of metallurgical equipment, relates to the technical field of slab casting, and particularly relates to a structure for increasing the rigidity of a continuous casting fan-shaped section.
Background
In order to improve the center macrostructure of a casting blank, eliminate or reduce the defects of center looseness, shrinkage cavity segregation and the like of the casting blank and improve the center density of the casting blank, the continuous casting process adopts a reduction technology of the casting blank. The reduction technology is that in a certain area of a fan-shaped section of a continuous casting machine, the roll gap is manually adjusted and reduced, and the reduction of a casting blank is realized. The pressing technology comprises light pressing and heavy pressing, and the pressing amount of the light pressing is generally 0.6-1.5 mm/m. At present, a continuous casting soft reduction technology is widely used for a large square billet and wide and thick plate continuous casting machine, and a sector equipment technology for realizing the soft reduction function is mature. Research and implementation of heavy pressing are still in progress, and further research and development are needed for the sector technology applied to heavy pressing.
The continuous casting segment is a key device in a continuous casting machine set, is arranged behind the bending segment, and is used for supporting and guiding a casting blank or a dummy bar, and cooling, bending, straightening and the like are carried out on the casting blank in the guiding process. The sector section equipment mainly comprises an inner arc frame, an outer arc frame, a clamping and roll gap adjusting device and continuous casting rolls (a driving roll and a free roll). The surface and internal quality of the casting blank have a direct relation with the online roll gap precision of the sector. And the online roll gap precision is directly related to the rigidity of the segment besides the installation and assembly precision, the mechanical clearance and the load. When the casting blank is reduced, the area of the sector-shaped continuous casting roll contacting the casting blank is increased, and the reaction force of the casting blank deformation to the continuous casting roll is also remarkably increased. If the rigidity of the sector section is insufficient, the online roll gap is inevitably increased, the roll gap precision is reduced, and the quality of a casting blank is further influenced. The strength and rigidity of the segments must be increased to withstand the loads and reduce deformation.
Because the segment has compact structure, the body is provided with complex mechanisms such as hydraulic tubing, lubricating tubing, cooling tubing and the like, and the space for assembling and disassembling the segment also needs to be considered, so that the rigidity of the segment is further improved in the limited space from the aspect of structure and is limited. Therefore, with the increase of continuous casting reduction, the rigidity of the existing mature segment is difficult to meet the requirement of the increase of the continuous casting reduction.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a structure for increasing the rigidity of a continuous casting fan-shaped section, and the structure solves the problems that the roll gap precision is low and the process requirements cannot be met due to insufficient rigidity of the fan-shaped section caused by the increase of the reduction required by the continuous casting process in the prior art, so that the surface and internal quality of a casting blank is effectively improved.
In order to solve the technical problems, the structure for increasing the rigidity of the continuous casting fan-shaped section comprises an inner arc frame, an outer arc frame, a continuous casting roller and a clamping and roller gap adjusting device, wherein the inner arc frame and the outer arc frame are arranged at intervals up and down, the continuous casting roller is arranged between the inner arc frame and the outer arc frame through the clamping and roller gap adjusting device, the structure further comprises a pre-stress mechanism and a pre-stress mechanism, the pre-stress mechanism is arranged above a neutral layer of the inner arc frame and enables a structure above the neutral layer of the inner arc frame to have compressive stress, and the pre-stress mechanism is arranged below the neutral layer of the inner arc frame and enables a structure below the neutral layer of the inner arc frame to have tensile stress.
Further, the pre-stress mechanism comprises two upper mounting seats, a screw rod and a nut, the two upper mounting seats are respectively arranged on two sides above the neutral layer of the inner arc frame, through holes are formed in the upper mounting seats, the screw rod penetrates through the through holes of the two upper mounting seats, two ends of the screw rod extend out, and the nut is screwed on the extending end of the screw rod respectively; the pre-tensioning stress mechanism comprises two lower mounting seats, a left-handed screw, a right-handed screw and left and right nuts, the two lower mounting seats are respectively arranged on two sides below the neutral layer of the inner arc frame, the front ends of the left-handed screw and the right-handed screw are respectively fixedly arranged on the two lower mounting seats, and the left and right nuts are screwed on the tail ends of the left-handed screw and the right-handed screw.
Further, the two upper installation seats are respectively arranged on two sides of the upper edge of the inner arc frame, and the two lower installation seats are respectively arranged on two sides of the lower edge of the inner arc frame.
Further, the number of the nuts is four, and the nuts are respectively screwed at the extending ends of the screw rods.
Further, the two upper mounting seats and the two lower mounting seats are fixedly connected with the inner arc frame through welding or bolts.
The structure for increasing the rigidity of the continuous casting fan-shaped section adopts the technical scheme that the inner arc frame and the outer arc frame are arranged at intervals up and down in the structure, the continuous casting roller is arranged between the inner arc frame and the outer arc frame through the clamping and roller gap adjusting device, the structure also comprises a pre-stress mechanism and a pre-stress mechanism, the pre-stress mechanism is arranged above a neutral layer of the inner arc frame and enables the structure above the neutral layer of the inner arc frame to have compressive stress, and the pre-stress mechanism is arranged below the neutral layer of the inner arc frame and enables the structure below the neutral layer of the inner arc frame to have tensile stress. The structure solves the problems that the roll gap precision is lower and the process requirements cannot be met due to insufficient rigidity of the sector section caused by the increase of the reduction required by the continuous casting process in the prior art, thereby effectively improving the surface and internal quality of the casting blank.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic view of the construction of the present invention for increasing the stiffness of a continuous casting segment;
FIG. 2 is a schematic drawing of the stress of the inner arc frame of the continuous casting segment.
Detailed Description
The structure for increasing the rigidity of the continuous casting segment comprises an inner arc frame 1, an outer arc frame 2, a continuous casting roller 3, a clamping and roller gap adjusting device 4, wherein the inner arc frame 1 and the outer arc frame 2 are arranged at intervals up and down, the continuous casting roller 3 is arranged between the inner arc frame 1 and the outer arc frame 2 through the clamping and roller gap adjusting device 4, the structure further comprises a pre-stress mechanism 5 and a pre-stress mechanism 6, the pre-stress mechanism 5 is arranged above a neutral layer 11 of the inner arc frame 1 and enables the structure of the part above the neutral layer 11 of the inner arc frame 1 to have compressive stress, and the pre-stress mechanism 6 is arranged below the neutral layer 11 of the inner arc frame 1 and enables the structure of the part below the neutral layer 11 of the inner arc frame 1 to have tensile stress.
Preferably, the pre-stress mechanism 5 includes two upper mounting seats 51, a screw 52 and a nut 53, the two upper mounting seats 51 are respectively disposed on two sides of the neutral layer 11 of the inner arc frame 1, a through hole is formed on the upper mounting seat 51, the screw 52 penetrates through the through hole of the two upper mounting seats 51 and two ends of the screw extend out, and the nut 53 is respectively screwed on the extending end of the screw 52; the pre-tensioning stress mechanism 6 comprises two lower mounting seats 61, a left-handed screw 62, a right-handed screw 63 and a left-handed nut 64, wherein the two lower mounting seats 61 are respectively arranged at two sides of the inner arc frame 1 below the neutral layer 11, the front ends of the left-handed screw 62 and the right-handed screw 63 are respectively fixedly arranged on the two lower mounting seats 61, and the left-handed nut 64 and the right-handed nut 64 are screwed on the tail ends of the left-handed screw 62 and the right-handed screw 63.
Preferably, the two upper mounting seats 51 are respectively disposed on two sides of the upper edge of the inner arc frame 1, and the two lower mounting seats 61 are respectively disposed on two sides of the lower edge of the inner arc frame 1.
Preferably, the nuts 53 are four and are respectively screwed to the protruding ends of the screw rods 52.
Preferably, the two upper mounting seats 51 and the two lower mounting seats 61 are fixedly connected with the inner arc frame 1 by welding or bolts.
In the structure, the two upper mounting seats, the screw rod and the nut form a pre-stress mechanism, the two upper mounting seats are tightly pressed by screwing the nut, and the two upper mounting seats transmit load to act on the inner arc frame, so that the structure of the part above the neutral layer of the inner arc frame has compressive stress; the two lower mounting seats, the left-handed screw, the right-handed screw and the left-handed nut and the right-handed nut form a pre-tensioning stress mechanism, the left-handed screw and the right-handed nut are screwed to change the gap between the tail ends of the left-handed screw and the right-handed screw, the front ends of the left-handed screw and the right-handed screw push the two lower mounting seats, and the two lower mounting seats transmit load to act on the inner arc frame, so that the structure of the part below the neutral layer of the inner arc frame has tensile stress.
The structure can be provided with the pre-stress mechanism and the pre-stress mechanism simultaneously according to the space condition of the sector section, and can also be provided with the pre-stress mechanism or the pre-stress mechanism independently.
As shown in fig. 2, when the segment is continuously cast on line, the segment inner arc frame 1 is subjected to the reaction force F1 of the clamping and roll gap adjusting device 4 and the resultant force F2 of the continuous casting roll 3 load, the part above the neutral layer 11 of the segment inner arc frame 1 is mainly subjected to tensile stress F3, and the part below the neutral layer 11 is mainly subjected to compressive stress F4. The structure is arranged above the neutral layer of the inner arc frame of the sector section and is a pre-stress mechanism, so that the structure above the neutral layer of the inner arc frame has compressive stress; the part arranged below the neutral layer of the inner arc frame of the segment is a pre-tensioning mechanism, so that the structure of the part below the neutral layer of the inner arc frame has tensile stress. When the fan-shaped section is assembled and adjusted off line, the structure applies load to the upper mounting seat fixed on the part above the neutral layer of the inner arc frame of the fan-shaped section, so that the part above the neutral layer of the inner arc frame of the fan-shaped section generates pre-stress; the pre-tensioning stress mechanism applies load to a lower mounting seat fixed below the neutral layer of the inner arc frame of the segment, so that tensile stress is generated below the neutral layer of the inner arc frame of the segment. Thereby improving the integral rigidity of the inner arc frame of the sector section during continuous casting operation. Because the outer arc frame is fixed on the fan-shaped section basic frame, the integral rigidity is far greater than that of the inner arc frame, and the outer arc frame does not need to be provided with a prestress mechanism. Thus, during casting, the prestress compensation reduces the stress value of the segment caused by external load and reduces deformation, thereby improving the on-line integral rigidity of the segment.
Claims (4)
1. The utility model provides a structure of fan-shaped section rigidity of increase continuous casting, includes inner arc frame, outer arc frame, continuous casting roller, presss from both sides tight and roll gap adjusting device, inner arc frame and outer arc frame interval arrangement from top to bottom, continuous casting roller warp press from both sides tight and roll gap adjusting device locates between inner arc frame and the outer arc frame, its characterized in that: the structure also comprises a pre-stress mechanism and a pre-stress mechanism, wherein the pre-stress mechanism is arranged above the neutral layer of the inner arc frame and enables the structure of the part above the neutral layer of the inner arc frame to have compressive stress, and the pre-stress mechanism is arranged below the neutral layer of the inner arc frame and enables the structure of the part below the neutral layer of the inner arc frame to have tensile stress; the pre-stress mechanism comprises two upper mounting seats, a screw rod and a nut, the two upper mounting seats are respectively arranged on two sides above the neutral layer of the inner arc frame, through holes are formed in the upper mounting seats, the screw rod penetrates through the through holes of the two upper mounting seats, two ends of the screw rod extend out, and the nut is screwed on the extending end of the screw rod respectively; the pre-tensioning stress mechanism comprises two lower mounting seats, a left-handed screw, a right-handed screw and left-handed and right-handed nuts, the two lower mounting seats are respectively arranged on two sides below the neutral layer of the inner arc frame, the front ends of the left-handed screw and the right-handed screw are respectively fixedly arranged on the two lower mounting seats, and the left-handed and right-handed nuts are screwed on the tail ends of the left-handed screw and the right-handed screw.
2. The structure for increasing the rigidity of a continuous casting segment according to claim 1, wherein: the two upper mounting seats are respectively arranged on two sides of the upper edge of the inner arc frame, and the two lower mounting seats are respectively arranged on two sides of the lower edge of the inner arc frame.
3. The structure for increasing the rigidity of a continuous casting segment according to claim 1 or 2, wherein: the number of the nuts is four, and the nuts are respectively screwed at the extending ends of the screw rods.
4. The structure for increasing the rigidity of a continuous casting segment according to claim 3, wherein: the two upper mounting seats and the two lower mounting seats are fixedly connected with the inner arc frame through welding or bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710876107.6A CN109550914B (en) | 2017-09-25 | 2017-09-25 | Structure for increasing rigidity of continuous casting fan-shaped section |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710876107.6A CN109550914B (en) | 2017-09-25 | 2017-09-25 | Structure for increasing rigidity of continuous casting fan-shaped section |
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| CN109550914A CN109550914A (en) | 2019-04-02 |
| CN109550914B true CN109550914B (en) | 2021-11-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU735377A1 (en) * | 1977-07-20 | 1980-05-25 | Уральский завод тяжелого машиностроения им. С.Орджоникидзе | Apparatus for drawing ingot from radial mould of continuous-casting machine |
| CN1686631A (en) * | 2005-03-18 | 2005-10-26 | 西安重型机械研究所 | Designing method of prestressed machine frame |
| CN201439115U (en) * | 2009-05-12 | 2010-04-21 | 宁波中超机器有限公司 | Withdrawal strengthening machine for slab caster |
| CN101979184A (en) * | 2010-11-23 | 2011-02-23 | 田陆 | Control method and system for dynamic soft reduction of continuous casting machine, and continuous casting machine |
| CN202239549U (en) * | 2011-03-11 | 2012-05-30 | 上海亚新连铸技术工程有限公司 | Multi-pressure control system |
| CN204354275U (en) * | 2014-11-24 | 2015-05-27 | 黄贺明 | A kind of cable duct list ditch mould |
-
2017
- 2017-09-25 CN CN201710876107.6A patent/CN109550914B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU735377A1 (en) * | 1977-07-20 | 1980-05-25 | Уральский завод тяжелого машиностроения им. С.Орджоникидзе | Apparatus for drawing ingot from radial mould of continuous-casting machine |
| CN1686631A (en) * | 2005-03-18 | 2005-10-26 | 西安重型机械研究所 | Designing method of prestressed machine frame |
| CN201439115U (en) * | 2009-05-12 | 2010-04-21 | 宁波中超机器有限公司 | Withdrawal strengthening machine for slab caster |
| CN101979184A (en) * | 2010-11-23 | 2011-02-23 | 田陆 | Control method and system for dynamic soft reduction of continuous casting machine, and continuous casting machine |
| CN202239549U (en) * | 2011-03-11 | 2012-05-30 | 上海亚新连铸技术工程有限公司 | Multi-pressure control system |
| CN204354275U (en) * | 2014-11-24 | 2015-05-27 | 黄贺明 | A kind of cable duct list ditch mould |
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| CN109550914A (en) | 2019-04-02 |
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