CN115475922A - Method for improving casting time of thin strip continuous casting and side sealing device thereof - Google Patents
Method for improving casting time of thin strip continuous casting and side sealing device thereof Download PDFInfo
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- CN115475922A CN115475922A CN202110600210.4A CN202110600210A CN115475922A CN 115475922 A CN115475922 A CN 115475922A CN 202110600210 A CN202110600210 A CN 202110600210A CN 115475922 A CN115475922 A CN 115475922A
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0648—Casting surfaces
- B22D11/066—Side dams
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Abstract
A method for improving the casting time of thin strip continuous casting and a side sealing device thereof comprise the following steps: 1) The end surfaces of both sides of the crystallization roller are provided with side sealing plates which can move upwards and downwards in a unidirectional way or in a bidirectional way; when the side sealing plates move upwards, the length of the side sealing plates is more than twice of the distance between upper and lower intersection points of the upper and lower side sealing plates contacted with the cambered surfaces of the crystallization rollers; when the side sealing plate moves downwards, the length of the side sealing plate is more than twice of the distance between an upper intersection point formed by one side edge of the side sealing plate contacting with the upper part of the cambered surface of the crystallization roller and a lower intersection point formed by the extension line of the side edge contacting with the lower part of the cambered surface of the crystallization roller; 2) The side sealing plates which cling to the end surfaces of the crystallization rollers rotate along with the crystallization rollers are in contact friction with the end surfaces of the crystallization rollers to form grooves on the inner side surfaces of the crystallization rollers, when the displacement L of the side sealing plates is more than or equal to (1/10-1/2) d, d is the thickness of the side sealing plates, and is in unit mm, L and unit mm; moving the side sealing plates outwards along the axial direction of the crystallization roller to enable the end surfaces of the crystallization roller to be separated from the grooves on the surfaces of the side sealing plates; and then moving the side sealing plates upwards or downwards until the grooves on the side sealing plates are completely separated from the end faces of the crystallization rollers.
Description
Technical Field
The invention relates to a thin strip continuous casting technology, in particular to a method for improving the thin strip continuous casting time and a side sealing device thereof.
Background
The technology of thin strip continuous casting is a new thin strip steel production technology, molten steel is cast into a molten pool enclosed by double rollers and side sealing plates through a transition device such as a water gap flow distributor, and 2-10mm strip steel is directly produced after the double rollers are cast and rolled. Compared with the traditional continuous casting process, a series of conventional procedures such as rough rolling, hot continuous rolling and related heating, end cutting and the like are cancelled. The method has the advantages of less equipment investment, simple production process, low energy consumption, low product cost and the like, and is a revolutionary short process flow in the field of industrial production of the steel strip in the 21 st century.
The flow distribution system, the crystallization roller and the side sealing plate are three key components of a thin strip continuous casting process and become one of key factors for restricting the continuous production of the process, wherein the side sealing technology is the most key ring in the thin strip continuous casting technology and is a key factor influencing the quality of a cast strip and the process stability in the thin strip continuous casting process, and the side sealing plays roles in restraining metal liquid, promoting thin strip forming, ensuring the edge quality of the thin strip and the like. Currently, the edge sealing technology mainly includes: the method comprises three side sealing modes of electromagnetic side sealing, gas side sealing and solid side sealing, wherein the gas side sealing is still in a theoretical research stage at present. The electromagnetic side sealing technology has not yet achieved the requirement of industrial production. Solid edge sealing is the best edge sealing method with the mature technology and the best industrial application at present.
Specifically, in the current strip casting process, the side sealing plates are triangular, the middle parts of the side sealing plates are contacted with molten steel and are eroded by the molten steel, the side parts of the side sealing plates are contacted with the end surfaces of the casting rolls and are abraded by the casting rolls, and the abrasion rate is generally higher than the erosion rate. Therefore, after a certain casting time, deep groove marks are formed at the contact positions of the side seal plates and the end surfaces of the crystallization rolls, and the end surfaces in contact with molten steel are corroded to a small extent. In the casting process, when the number of continuous casting furnaces averagely reaches 4-6, the groove marks on the two sides of the side sealing plate are gradually deepened, so that the side sealing plate needs to be frequently replaced in the production process. On one hand, the unit needs to stop and carry out the processes of preparation, installation and the like again when the side sealing plates are replaced each time, and the time and the labor are consumed; on the other hand, each time the production line is restarted, various consumable parts such as a casting nozzle, a distributor and the like need to be replaced, and the ton steel cost of the production line is greatly increased.
At present, solid side sealing plates researched and developed at home and abroad mainly focus on refractory materials, such as:
U.S. Pat. No. 5,7208433,433 to Ceramic plates for side dams of twin-drim connecting strip cassettes proposes the use of a Ceramic side sealing plate made of a composite material of rare earth garnet, sialon and BN (boron nitride), and reports that the side sealing plate has low thermal conductivity (thermal conductivity is less than or equal to 10W/m.K) and good thermal shock resistance.
US4885264"Pressure-sintered polypystalline mixed materials with a base of hexagonal boron nitride, oxides and carbides" investigated the preparation of ceramic side sealing plates from boron nitride-oxide based composites and boron nitride-non-oxide composites, in which BN-ZrO was used 2 SiC and ZrC are respectively added into the matrix, and the ceramic composite material is prepared by hot pressing and sintering at 1500-1800 ℃ under the vacuum condition.
Chinese patent CN101648260A "twin-roll thin-strip continuous casting side sealing plate and its manufacturing method" a composite side sealing plate is manufactured by using a face plate made of boron nitride and a substrate made of aluminum-silicon heat-insulating material, and the patent reports that the composite side sealing plate has good heat-insulating property.
Chinese patent 201410161789.9 discloses a ceramic side sealing plate for twin-roll thin-strip continuous casting and a preparation method thereof, and the ceramic side sealing plate comprises the following chemical components in percentage by mass: hexagonal boron nitride powder 40-75%, si3N 4 10 to 45 percent of powder, 10 to 30 percent of zirconium mullite powder, 3 to 15 percent of TiN powder and 0.5 to 10 percent of additive, wherein the additive is Y 2 O 3 Industrial Al 2 O 3 One or a combination of more of MgO and light magnesium carbonate. According to the invention, by developing a novel formula composition of the novel side sealing plate and adjusting the preparation method of the novel side sealing plate, the side sealing plate has the performances of high temperature resistance, high strength, thermal shock resistance and low thermal conductivity.
Chinese patent 201610948816.6 discloses "a supporting device and method for twin-roll strip casting side sealing plate", the method is: in the thin-strip continuous casting operation, the side sealing plates and the supporting devices thereof are tightly attached to the end faces of the casting rolls under certain pressure under the action of the pushing rods of the pushing mechanisms, and the pushing mechanisms of the side sealing plates have different pushing states by controlling the opening and closing of the one-way valves at different casting operation time points, so that the supporting stability of the side sealing plates is improved.
Chinese patent 201611051974.8 discloses "a side seal board for strip continuous casting and method of use thereof", it has designed that two roller strip continuous casting uses the side seal board and includes side seal board body and lubricating arrangement, and the side seal board is bonded together by fluted body, heat insulating board, base plate, ceramic plate and antifriction plate and is constituteed, and lubricating arrangement has lubricant material and conveyer pipe to constitute: the delivery tube is filled with a lubricant material. The side sealing plate is said to have good heat preservation performance, good thermal shock resistance and wear resistance of the contact part of the side sealing plate and the crystallizing roller, and strong erosion resistance of the contact part of the side sealing plate and the molten steel.
The above patents propose different methods in terms of side sealing plate material and installation, but the service life is still determined by the worn thickness of a single side sealing plate, so that longer casting time cannot be achieved, and the existing problems are not solved.
Disclosure of Invention
The invention aims to provide a method for improving the strip continuous casting time and a side sealing device thereof, which can realize unidirectional or bidirectional displacement by improving the shape and the installation mode of a side sealing plate, realize the return of an integral side sealing device within a certain time, continuously avoid groove marks formed by the abrasion of the end surface of a crystallization roller, form the staggered abrasion of the side sealing plate, increase the utilization rate of the side sealing plate and improve the strip continuous casting time.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of increasing thin strip casting time, comprising:
1) Side sealing plates capable of moving upwards and downwards in a one-way or two-way are arranged on the end surfaces of two sides of the crystallization roller;
when the side sealing plates move upwards, the length of each side sealing plate is more than twice of the distance between upper and lower intersection points of the upper and lower side sealing plates in contact with the cambered surfaces of the crystallization rollers;
when the side sealing plate moves downwards, the length of the side sealing plate is more than twice of the distance between an upper intersection point formed by one side edge of the side sealing plate contacting with the upper part of the cambered surface of the crystallization roller and a lower intersection point formed by the extension line of the side edge contacting with the lower part of the cambered surface of the crystallization roller;
2) Along with the rotation of the crystallization roller, the side seal plates tightly attached to the end surfaces of the crystallization roller are in contact friction with the end surfaces of the crystallization roller to form grooves on the surfaces of the side seal plates, when the depth of the end surfaces of the crystallization roller embedded into the surfaces of the side seal plates, namely the displacement L of the side seal plates is more than or equal to (1/10-1/2) d, wherein d is the thickness of the side seal plates in unit mm, L is in unit mm; firstly, moving the side sealing plate outwards along the axial direction of the crystallization roller to enable the end surface of the crystallization roller to be separated from the groove on the surface of the side sealing plate; and then moving the side sealing plates upwards or downwards until the grooves on the side sealing plates are completely separated from the end surface range of the crystallization roller.
Preferably, the side sealing plates are moved downwards, and after the side sealing plates are arranged on the end surfaces of the two crystallization rollers, the lower parts of the side sealing plates are in contact with the end surfaces of the crystallization rollers; the end point of one side of the top surface of the side sealing plate is a point A, the same side of the bottom surface of the side sealing plate is intersected with the lower end of the arc line of the crystallizing roller to form a lower intersection point which is a point C, the same side of the side sealing plate is intersected with the upper intersection point of the arc line of the crystallizing roller to form a point B, the intersection point of the top surface of the molten pool and the crystallizing roller on one side is a point D, the nearest point of the two crystallizing rollers is a Kiss point, and the point C is at least 10mm lower than the Kiss point;
when the lateral displacement detects that the displacement L of the lateral sealing plate in the thickness direction is larger than or equal to (1/10-1/2) d compared with the original position, wherein d is the thickness of the lateral sealing plate in unit mm, L and unit mm; the side sealing plates are moved outwards along the axial direction of the crystallization roller, so that the end faces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates, then the side sealing plates are moved downwards until the point B is removed by at least 10mm out of the range of the crystallization roller, at the moment, the upper intersection point and the lower intersection point of the side sealing plates and the arc lines of the crystallization roller are respectively a point B2 and a point B1, the point B1 is higher than the point D by at least 10mm, and the point A is higher than the point B2 by at least 30mm.
Preferably, the side sealing plates move downwards at a speed of 0.1-20 mm/s.
Preferably, when the side sealing plates are moved upwards, after the side sealing plates are arranged on the end faces of the two crystallization rollers, the upper parts of the side sealing plates are contacted with the end faces of the crystallization rollers, the end point on one side of the top surfaces of the side sealing plates is a point A,
the intersection point of the same side of the crystallizing roller arc line and the upper intersection point of the same side of the crystallizing roller arc line is a point B, the intersection point of the same side of the crystallizing roller arc line and the lower intersection point of the same side of the crystallizing roller arc line is a point B1, the intersection point of the top surface of the molten pool and the crystallizing roller on one side is a point D, the closest point between the two crystallizing rollers is a Kiss point, the point B is higher than the point D by at least 10mm, and the point A is higher than the point B by at least 30mm;
when the lateral displacement detects that the displacement L of the lateral sealing plate in the thickness direction is larger than or equal to (1/10-1/2) d compared with the original position, wherein d is the thickness of the lateral sealing plate in unit mm, L and unit mm; the side sealing plates are moved outwards along the axial direction of the crystallization roller, so that the end faces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates, then the side sealing plates are moved upwards until the point B1 is removed at least 10mm out of the range of the crystallization roller, the points where the side sealing plates and the crystallization roller are intersected are a point B2 and a point C, the point B2 is higher than the point D by at least 10mm, and the point C is lower than the point Kiss by at least 10mm.
Preferably, the side sealing plates are moved upward at a speed of 0.1 to 20 mm/s.
The invention discloses a side sealing device for the method for improving the casting time of the thin strip continuous casting, which comprises the following steps:
the two side sealing plates are respectively arranged on the side end surfaces of the two crystallization roller molten pools;
the supporting rollers and the shafts are arranged on the back of the side sealing plate, and the supporting rollers are abutted against the side sealing plate;
the two guide rails are respectively arranged on two sides of the side sealing plate, each guide rail is of a U-shaped structure, a plurality of rollers and corresponding wheel shafts are arranged in each guide rail along the length direction, corresponding to the wheel shafts, and guide grooves for the left and right movement of the wheel shafts are arranged on two side edges of the U-shaped structure of the guide rails;
a plurality of reset pins which are respectively arranged on the guide rails at intervals along the length direction of the two guide rails,
the electromagnetic relays are arranged on the outer side of the guide rail through a support and respectively correspond to the return pins one by one;
and the plurality of reset driving devices respectively correspond to the outer side ends of the wheel shafts of the rollers.
Preferably, the reset pin is U-shaped, one side end of the reset pin is located at one side of the guide rail on the back of the side sealing plate, and the electromagnetic relay corresponds to the side end.
Preferably, the reset driving device comprises an air cylinder, an electric cylinder or a hydraulic cylinder.
Preferably, the lower part of the side sealing plate is trapezoidal.
The invention improves the shape, the installation method and the use method of the side sealing plate, so that the side sealing plate can move in a single direction or in two directions at the side sealing position, the end surface of the crystallization roller avoids a groove formed by the contact of the end surface of the crystallization roller on the side sealing plate, and the side sealing plate is prevented from forming an overlarge dent at a single position and needing to be replaced by stopping the continuous casting operation.
The invention has the beneficial effects that:
1. according to the invention, through the up-and-down movement of the side sealing plates and the side sealing device, the abrasion area of the side sealing plates can be increased, so that the continuous casting time of the thin strip continuous casting is greatly increased.
2. The method and the side sealing device of the invention also save the time and cost for replacing the distributor and the distributor in the casting process in the continuous use process.
3. The side sealing device is simple, reliable and easy to realize.
Drawings
FIG. 1 is a schematic view of an embodiment of the method for increasing the strip casting time according to the present invention;
FIG. 2 is a schematic view of an embodiment of the method for increasing strip casting time according to the present invention;
FIG. 3 is a schematic view of an embodiment of the method for increasing strip casting time according to the present invention;
FIG. 4 is a schematic view of an embodiment of the method for increasing strip casting time according to the present invention;
FIG. 5 is a perspective view of the side seal apparatus of the present invention in use;
FIG. 6 is a perspective view of the side seal apparatus of the present invention in use;
FIG. 7 is a front view of an embodiment of the edge dam of the present invention;
FIG. 8 is a perspective view of the edge dam apparatus of the present invention in accordance with one embodiment of the present invention shown in FIG. 1;
FIG. 9 is a perspective view of an embodiment of the edge dam of the present invention shown in FIG. 2.
Detailed Description
Referring to fig. 1 to 4, the method for increasing the strip casting time according to the present invention includes:
1) The two side end faces of the crystallization roller 100 are provided with side seal plates 1 which can move upwards and downwards in a single direction or in two directions;
when the side sealing plates 1 move upwards, the length of the side sealing plates 1 is more than twice of the distance between the upper intersection point and the lower intersection point of the side sealing plates 1, which are contacted with the cambered surface of the crystallization roller 100;
when the side sealing plate 1 moves downwards, the length of the side sealing plate 1 is more than twice of the distance between an upper intersection point formed by the contact of one side edge of the side sealing plate 1 and the upper part of the cambered surface of the crystallization roller 100 and a lower intersection point formed by the contact of the extension line of the side edge and the lower part of the cambered surface of the crystallization roller 100;
2) Along with the rotation of the crystallization roller, the side seal plates tightly attached to the end faces of the crystallization roller are in contact friction with the end faces of the crystallization roller to form grooves on the surfaces of the side seal plates, and when the end faces of the crystallization roller are embedded into the surfaces of the side seal plates, namely the displacement L of the side seal plates is more than or equal to (1/10-1/2) d, wherein d is the thickness of the side seal plates, and the unit is mm, L and unit mm; firstly, moving the side sealing plates outwards along the axial direction of the crystallization roller to ensure that the end surfaces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates; and then moving the side sealing plates upwards or downwards until the grooves on the side sealing plates are completely separated from the end surface range of the crystallization roller.
Preferably, the side sealing plates are moved downwards, and after the side sealing plates are arranged on the end surfaces of the two crystallization rollers, the lower parts of the side sealing plates are in contact with the end surfaces of the crystallization rollers; the end point of one side of the top surface of the side sealing plate is a point A, the same side of the bottom surface of the side sealing plate is intersected with the lower end of the arc line of the crystallizing roller to form a lower intersection point which is a point C, the same side of the side sealing plate is intersected with the upper intersection point of the arc line of the crystallizing roller to form a point B, the intersection point of the top surface of the molten pool and the crystallizing roller on one side is a point D, the nearest point of the two crystallizing rollers is a Kiss point, and the point C is at least 10mm lower than the Kiss point;
when the displacement is detected, the displacement L is more than or equal to (1/10-1/2) d when the thickness direction of the side sealing plate is greater than the original position, wherein d is the thickness of the side sealing plate in unit mm, L and unit mm; the side sealing plates are moved outwards along the axial direction of the crystallization roller, so that the end faces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates, then the side sealing plates are moved downwards until the point B is removed by at least 10mm out of the range of the crystallization roller, at the moment, the upper intersection point and the lower intersection point of the side sealing plates and the arc lines of the crystallization roller are respectively a point B2 and a point B1, the point B1 is higher than the point D by at least 10mm, and the point A is higher than the point B2 by at least 30mm.
Preferably, the side sealing plates move downwards at a speed of 0.1-20 mm/s.
Preferably, when the side sealing plates are moved upwards, after the side sealing plates are arranged on the end surfaces of the two crystallization rollers, the upper parts of the side sealing plates are in contact with the end surfaces of the crystallization rollers, the end point on one side of the top surfaces of the side sealing plates is a point A,
the intersection point of the same side of the crystallization roller with the arc line of the crystallization roller is a point B, the intersection point of the same side of the crystallization roller with the arc line of the crystallization roller is a point B1, the intersection point of the top surface of the molten pool with the crystallization roller on one side is a point D, the closest point between the two crystallization rollers is a Kiss point, the point B is higher than the point D by at least 10mm, and the point A is higher than the point B by at least 30mm;
when the displacement is detected, the displacement L is more than or equal to (1/10-1/2) d when the thickness direction of the side seal plate is greater than the original position, wherein d is the thickness of the side seal plate in unit mm, L and unit mm; the side sealing plates are moved outwards along the axial direction of the crystallization roller, so that the end faces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates, then the side sealing plates are moved upwards until the point B1 is removed at least 10mm out of the range of the crystallization roller, the points where the side sealing plates and the crystallization roller are intersected are a point B2 and a point C, the point B2 is higher than the point D by at least 10mm, and the point C is lower than the point Kiss by at least 10mm.
Preferably, the side sealing plates are moved upward at a speed of 0.1 to 20 mm/s.
Referring to fig. 5 to 9, the edge dam apparatus for the method of increasing strip casting time according to the present invention includes:
two side sealing plates 1 are respectively arranged on the side end surfaces of the two crystallization rollers 100 and the molten pool 200;
the supporting rollers 2 and the shafts are arranged on the back surface of the side sealing plate 1, and the supporting rollers 2 are abutted against the side sealing plate 1;
the two guide rails 3 are respectively arranged on two sides of the side sealing plate 1, each guide rail 3 is of a U-shaped structure, a plurality of rollers 4 and corresponding wheel shafts 41 are arranged in each guide rail 3 along the length direction, and guide grooves 31 for the left and right movement of the wheel shafts 41 are arranged on two side edges of the U-shaped structure of each guide rail 3 corresponding to the wheel shafts 41;
a plurality of reset pins 5 which are respectively arranged on the guide rails 1 at intervals along the length direction of the two guide rails 1,
the electromagnetic relays 6 are arranged on the outer side of the guide rail 3 through a support and respectively correspond to the return pins 5 one by one;
and the plurality of reset driving devices (not shown) respectively correspond to the outer side ends of the wheel shafts of the rollers.
Preferably, the reset pin 5 is U-shaped, and one side end thereof is located at one side end of the guide rail 3 on the back surface of the side sealing plate 1, and the electromagnetic relay 6 corresponds to the side end.
Preferably, the reset driving device comprises an air cylinder, an electric cylinder or a hydraulic cylinder.
Preferably, the lower part of the side sealing plate is trapezoidal.
Examples
The method and the side sealing device of the invention are used for casting the stainless steel by strip continuous casting, and the main steps are as follows:
(1) The thin strip continuous casting adopts side sealing plates (the length is 900mm, the thickness is 30mm, the width is 300 mm), after the crystallization rollers are positioned, the side sealing plates are inserted from the top of the guide rail, and the liquid level height of a molten pool is 180mm;
(2) Positioning the side sealing plates after the rollers in the guide rails rotate, wherein the top positions of the side sealing plates are 30mm higher than the liquid level of a molten pool;
(3) When the side sealing plates are in place, the whole supporting roller presses against the back surfaces of the side sealing plates, the reset relay is powered off, and the reset pin is in an unstressed state;
(4) After the stainless steel is smelted to be qualified, molten steel casting is started, the molten steel is distributed to a molten pool through a distributor and a distributor, and at the initial stage of casting, rollers in the guide rail are kept still;
(5) In the middle stage of casting molten steel, along with the rotation of the crystallization roller, the inner side surfaces of the side sealing plates contacting with the end surfaces of the crystallization roller gradually form grooves, namely the side sealing plates are gradually embedded into the end surfaces of the crystallization roller; and detecting the displacement of the side sealing plates embedded into the end surfaces of the crystallization rollers, when the displacement is detected to be larger than or equal to 6mm, electrifying a reset relay, driving the side sealing plates to return to the original positions by a reset pin, then, upwards moving the side sealing plates at the speed of 10mm/s under the driving of rollers in the guide rails until grooves in the side sealing plates are completely separated from the molten pool, and powering off the reset relay.
Claims (9)
1. A method for improving the casting time of thin strip continuous casting is characterized by comprising the following steps:
1) The end surfaces of both sides of the crystallization roller are provided with side sealing plates which can move upwards and downwards in a unidirectional way or in a bidirectional way;
when the side sealing plates move upwards, the length of the side sealing plates is more than twice of the distance between upper and lower intersection points of the upper and lower sides of the side sealing plates, which are contacted with the cambered surfaces of the crystallization rollers;
when the side sealing plate moves downwards, the length of the side sealing plate is more than twice of the distance between an upper intersection point formed by one side edge of the side sealing plate contacting with the upper part of the cambered surface of the crystallization roller and a lower intersection point formed by the extension line of the side edge contacting with the lower part of the cambered surface of the crystallization roller;
2) Along with the rotation of the crystallization roller, the side seal plates tightly attached to the end surfaces of the crystallization roller are in contact friction with the end surfaces of the crystallization roller to form grooves on the surfaces of the side seal plates, when the depth of the end surfaces of the crystallization roller embedded into the surfaces of the side seal plates, namely the displacement L of the side seal plates is more than or equal to (1/10-1/2) d, wherein d is the thickness of the side seal plates in unit mm, L is in unit mm; firstly, moving the side sealing plates outwards along the axial direction of the crystallization roller to ensure that the end surfaces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates; and then moving the side sealing plates upwards or downwards until the grooves on the side sealing plates are completely separated from the end surface range of the crystallization roller.
2. The method for increasing strip casting time according to claim 1, wherein the side sealing plates are moved downward, and after the side sealing plates are mounted to the end surfaces of the two crystallization rolls, the lower portions of the side sealing plates are brought into contact with the end surfaces of the crystallization rolls; the end point of one side of the top surface of the side sealing plate is a point A, the same side of the bottom surface of the side sealing plate is intersected with the lower end of the arc line of the crystallizing roller to form a lower intersection point which is a point C, the same side of the side sealing plate is intersected with the upper intersection point of the arc line of the crystallizing roller to form a point B, the intersection point of the top surface of the molten pool and the crystallizing roller on one side is a point D, the two crystallizing rollers are closest to each other, namely a Kiss point, and the point C is at least 10mm lower than the Kiss point;
when the displacement is detected, the displacement L is more than or equal to (1/10-1/2) d when the thickness direction of the side sealing plate is greater than the original position, wherein d is the thickness of the side sealing plate in unit mm, L and unit mm; the side sealing plates are moved outwards along the axial direction of the crystallization roller, so that the end faces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates, then the side sealing plates are moved downwards until the point B is moved out of the range of the crystallization roller by at least 10mm, the upper intersection point and the lower intersection point of the side sealing plates and the arc lines of the crystallization roller are respectively a point B2 and a point B1, the point B1 is higher than the point D by at least 10mm, and the point A is higher than the point B2 by at least 30mm.
3. The method for improving the strip casting time according to claim 2, wherein the side sealing plates are moved downward at a speed of 0.1 to 20 mm/s.
4. The method for increasing strip casting time according to claim 1, wherein the side seal plates are moved upward so that the upper portions of the side seal plates are in contact with the end surfaces of the crystallization rolls after the side seal plates are fitted to the end surfaces of the crystallization rolls, and one side end point of the top surfaces of the side seal plates is point A,
the intersection point of the same side of the crystallizing roller arc line and the upper intersection point of the same side of the crystallizing roller arc line is a point B, the intersection point of the same side of the crystallizing roller arc line and the lower intersection point of the same side of the crystallizing roller arc line is a point B1, the intersection point of the top surface of the molten pool and the crystallizing roller on one side is a point D, the closest point between the two crystallizing rollers is a Kiss point, the point B is higher than the point D by at least 10mm, and the point A is higher than the point B by at least 30mm;
when the displacement is detected, the displacement L is more than or equal to (1/10-1/2) d when the thickness direction of the side sealing plate is greater than the original position, wherein d is the thickness of the side sealing plate in unit mm, L and unit mm; the side sealing plates are moved outwards along the axial direction of the crystallization roller, so that the end faces of the crystallization roller are separated from the grooves on the surfaces of the side sealing plates, then the side sealing plates are moved upwards until the point B1 is removed at least 10mm out of the range of the crystallization roller, the points where the side sealing plates and the crystallization roller are intersected are a point B2 and a point C, the point B2 is higher than the point D by at least 10mm, and the point C is lower than the point Kiss by at least 10mm.
5. The method for increasing the strip casting time according to claim 4, wherein the side sealing plates are moved upward at a speed of 0.1 to 20 mm/s.
6. A side dam apparatus for use in the method of increasing strip casting time of claim 1, comprising: the two side sealing plates are respectively arranged on the side end faces of the two crystallization roller molten pools; it is characterized by also comprising:
the supporting rollers and the shafts are arranged on the back surfaces of the side sealing plates, and the supporting rollers are abutted against the side sealing plates;
the two guide rails are respectively arranged on two sides of the side sealing plate, each guide rail is of a U-shaped structure, a plurality of rollers and corresponding wheel shafts are arranged in each guide rail along the length direction, the guide rails correspond to the wheel shafts, and guide grooves for the left and right movement of the wheel shafts are arranged on two side edges of the U-shaped structure of each guide rail;
a plurality of reset pins which are respectively arranged on the guide rails at intervals along the length direction of the two guide rails,
the electromagnetic relays are arranged on the outer side of the guide rail through a bracket and respectively correspond to the return pins one by one;
and the plurality of reset driving devices respectively correspond to the outer side ends of the wheel shafts of the rollers.
7. The side seal of claim 6, wherein said reset pin is U-shaped with a side end thereof located at one side of the rail on the back of said side seal plate, and said electromagnetic relay is corresponding to said side end.
8. The edge dam of claim 6, wherein the reset actuator comprises a pneumatic, electric, or hydraulic cylinder.
9. The side seal of claim 6 or 7, wherein said lower portion of said side seal plates is trapezoidal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114378268A (en) * | 2022-01-17 | 2022-04-22 | 山东理工大学 | Method for side sealing of double-roller casting-rolling molten pool in new generation and old generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114378268A (en) * | 2022-01-17 | 2022-04-22 | 山东理工大学 | Method for side sealing of double-roller casting-rolling molten pool in new generation and old generation |
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