US20090038771A1 - Casting Roll Moving Apparatus of Twin Roll Type Continuous Strip Casting Process - Google Patents
Casting Roll Moving Apparatus of Twin Roll Type Continuous Strip Casting Process Download PDFInfo
- Publication number
- US20090038771A1 US20090038771A1 US12/097,952 US9795206A US2009038771A1 US 20090038771 A1 US20090038771 A1 US 20090038771A1 US 9795206 A US9795206 A US 9795206A US 2009038771 A1 US2009038771 A1 US 2009038771A1
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- Prior art keywords
- fluid
- casting
- moving apparatus
- type continuous
- continuous strip
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- Abandoned
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- 238000005266 casting Methods 0.000 title claims abstract description 77
- 239000012530 fluid Substances 0.000 claims description 47
- 238000003860 storage Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 7
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 15
- 239000000161 steel melt Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 13
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 210000003625 skull Anatomy 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/051—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having oscillating walls
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- 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
- B22D11/0651—Casting wheels
-
- 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
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
- F16C13/02—Bearings
Definitions
- the present invention relates, in general, to casting roll moving apparatuses for twin roll type continuous strip casting machines which have structures such that casting rolls can smoothly move with reduced friction, and in which, if opposite ends of the casting roll become misaligned, they are automatically realigned and, more particularly, to a casting roll moving apparatus for a twin roll type continuous strip casting process which supports casting rolls using hydraulic pressure and reduces friction through the formation of fluid films during a casting process, so that, if opposite ends of the casting rolls become misaligned by the application of uneven rolling force to the casting rolls, or if the gap between the casting rolls becomes uneven due to longitudinal outside force or due to skull entering between the casting rolls, the casting rolls are automatically realigned, that is, are returned to the original positions thereof.
- an S/C (strip casting) process is a process of producing a cast strip 3 by supplying a steel melt 2 between two rolls 1 , which are rotating.
- edge dams are coupled to opposite ends of the casting rolls such that steel melt is prevented from leaking, thus forming a steel melt pool for supplying steel melt between the casting rolls.
- the steel melt is solidified while passing through the steel melt pool and is produced into a cast strip after passing through a roll nip.
- solidifying shells meet each other and are depressed at high temperature, thus being produced into a cast strip having a plate shape.
- the point at which the solidifying shells meet each other is called a solidification completion point, and the next section is called a thermal deformation section.
- the thermal deformation section has the same role as a hot rolling line. Furthermore, a rolling force is generated by roll separation force when passing the thermal deformation section.
- the two rolls are continuously moved such that the distance between the two rolls is maintained.
- the generated rolling force is divided into pressure due to solidification and rolling force due to friction at a lower position resulting from movement of the rolls.
- the rolling force due to friction generates the hunting of the rolling force during a casting process.
- the surface of the cast strip may deteriorate. That is, a defect, in which uneven patterns are formed on the surface, may occur.
- FIG. 2 shows the case in which the opposite ends of the rolls are undesirably misaligned or a gap between the rolls is made uneven by longitudinal outside force or by an uneven increase in the distance between the rolls due to skulls that enter between the rolls.
- the casting process becomes unstable, for example, the recovery rate is reduced or a defective winding phenomenon is caused.
- the casting process may be interrupted.
- the first conventional technique is related to a strip casting (S/C) process
- the second conventional technique is related to a hydrostatic bearing.
- a slide guide technique is one strip casting related technique.
- a slide guide slides on a wear plate using grease applied to the wear plate.
- This method has been used in a hot rolling mill and in a medium cast.
- the LM guide (linear motion guide). As shown in FIG. 3 , the LM guide includes a rail 6 and a carriage 5 . A sliding bearing is installed in the LM guide.
- the LM guide is widely used in an automation system.
- an object of the present invention is to provide a casting roll moving apparatus of a twin roll type continuous strip casting process which is operated by hydraulic pressure and forms fluid films to reduce friction, and in which, if overload is applied to rolls, the rolls are automatically realigned, thus solving problems of misalignment of the opposite ends of the rolls and of unstable rolling force and unstable roll gap during a casting process.
- the present invention provides a casting roll moving apparatus which can be used with a twin roll type strip casting machine that produces a strip through a method in which, while high-temperature steel melt is supplied between twin rolls which rotate in opposite direction, a large amount of heat is dissipated through the rolls by contact between the steel melt and the rolls, so that the steel melt is rapidly solidified.
- the present invention provides a casting roll moving apparatus of a twin roll type continuous strip casting process, including: a bearing housing supporting a casting roll shaft; a saddle coupled to the lower end of the bearing housing, with a sliding protrusion vertically protruding from a lower surface of the saddle; a mill frame having therein a receiving space so that the sliding protrusion of the saddle is movably inserted in the receiving space, pads provided on respective opposite sidewalls of the receiving space of the mill frame such that the pads are parallel to respective opposite side surfaces of the sliding protrusion of the saddle, and a shoe provided on the bottom of the receiving space such that the shoe is parallel to the lower surface of the sliding protrusion; and a hydraulic pressure supplying means for supplying fluid to opposite sidewalls and the bottom of the receiving space of the mill frame.
- the fluid supplying means includes a fluid storage tank storing the fluid, and a fluid distribution pipe line distributing the fluid from the fluid storage tank to the receiving space.
- each of the shoe and the pads has a nozzle to discharge the fluid to the sliding protrusion.
- the shoe and the pads comprise two or more shoes and pads such that hydraulic pressure is evenly applied to the overall opposite side surfaces and the overall lower surface of the sliding protrusion. Hydraulic pressures, which are substantially equal to each other, are applied between the pads and the sliding protrusion of the saddle.
- the casting roll moving apparatus further includes a fluid discharge pipe provided in the bottom of the receiving space of the mill frame to discharge the fluid, supplied from the hydraulic pressure supplying means, outside the receiving space.
- the fluid discharge pipe is connected to a circulation pipe so that the fluid is returned to the fluid storage tank.
- the fluid distribution pipe line includes a shock absorber 22 and a fluid distributor 23 .
- the casting roll moving apparatus of the present invention opposite ends of the casting rolls are automatically aligned, so that the recovery rate of the apparatus is increased, and a stable casting process is ensured. Furthermore, because friction of the apparatus is markedly reduced, by which even rolling force is ensured, the gap between the rolls is maintained constant. Thus, the thickness of a cast strip becomes even, and a problem of an uneven surface pattern is solved.
- FIG. 1 is a schematic view showing a conventional twin roll type continuous strip casting process
- FIG. 2 is views showing examples of defective arrangement of rolls in the conventional art
- FIG. 3 is a view showing an example of a typical LM (linear motion guide);
- FIG. 4 is a schematic view of a casting roll moving apparatus according to an embodiment of the present invention.
- FIG. 5 is an illustrative view showing the operation of the casting roll moving apparatus according to the present invention.
- FIG. 6 is a view showing an operating structure of the casting roll moving apparatus according to the present invention.
- FIG. 7 is graphs comparing the results of rolling force tests between the moving apparatus of the present invention and the conventional moving apparatus.
- FIG. 8 is pictures comparing the edges of cast strips using the moving apparatus of the present invention and using the conventional moving apparatus.
- FIG. 4 is a schematic view of a casting roll moving apparatus according to an embodiment of the present invention.
- FIG. 5 is an illustrative view showing the operation of the casting roll moving apparatus of the present invention.
- bearing housings 11 surround and support a roll shaft 1 - 1 , which is integrated with a casting roll 1 . Furthermore, each bearing housing 11 is coupled to each mill frame 13 through a saddle 12 . A sliding protrusion 12 - 1 protrudes downwards from a central portion of the lower surface of each saddle 12 . Furthermore, the saddle 12 is coupled to the lower surface of the bearing housing 11 using bolts or the like.
- Each mill frame 13 has in an upper surface thereof a receiving space 16 , in which the sliding protrusion 12 - 1 is movably inserted.
- Pads 15 are attached to the opposite sidewalls of the receiving space 16 such that the sliding protrusion 12 - 1 and the pads 15 maintain constant distance therebetween and are parallel to each other.
- a shoe 14 is provided on the bottom of the receiving space 16 such that it is parallel to and maintains a constant distance from the lower surface of the sliding protrusion 12 - 1 .
- a nozzle 17 for discharging fluid to the sliding protrusion 12 - 1 is installed in each of the shoes 14 and the pads 15 . It is preferable that two or more nozzles 17 be provided at positions corresponding to the sliding protrusion 12 - 1 to evenly apply pressure to the sidewalls and the lower surface of the sliding protrusion 12 - 1 .
- a fluid storage tank 18 and a fluid distribution pipe line 20 for supplying fluid into the receiving space 16 of the mill frame 13 and a circulation pipe 21 for returning used fluid from the receiving space 16 to the fluid storage tank 18 are provided outside the mill frame 13 .
- the fluid distribution pipe line 20 is coupled to the shoe 14 and the pads 15 of the receiving space 16 , and the fluid circulation pipe 21 is connected to a fluid discharge pipe 19 , which is provided in the bottom of the receiving space 16 .
- fluid is continuously supplied at a constant pressure to the shoe 14 and the pads 15 of the receiving space 16 through the fluid distribution 20 .
- the supplied fluid is discharged to the opposite sidewalls and the lower surface of the sliding protrusion 12 - 1 of the saddle at the same pressure through the nozzles 17 , thus forming fluid films thereon.
- the sliding protrusion 12 - 1 maintains the initial position thereof because fluid is discharged to the opposite sidewalls of the sliding protrusion 12 - 1 at even pressure. Thereby, the casting roll 1 can also maintain the original position thereof, thus making a normal casting operation possible.
- fluid films are formed both between the sliding protrusion and the pads and between the sliding protrusion and the shoe by hydraulic pressure discharged from the shoe and the pads, thus the saddle can smoothly move with reduced friction. Furthermore, the saddle can be automatically returned to the original position thereof by hydraulic pressure, which is evenly discharged.
- the hunting value of the rolling force which was + ⁇ 3 ton, is reduced to + ⁇ 0.5 ton. Thereby, stability of the roll gap is realized, so that variation in the thickness of the cast strip is reduced.
- variation in the thickness of the cast strip in the longitudinal direction ranges from 70 to 100 microns, but, in the present invention, it is reduced to 20 to 30 microns. This is very important in the art, because the variation in thickness of the cast strip affects a subsequent rolling process.
- the cast strip edge and the winding condition of the present invention were also found to be superior to those of the conventional art. It is assumed that this was achieved because the arrangement of opposite ends of the casting rolls was satisfactory thanks to the maintenance of stiffness by preloading. As a result, the recovery rate of the cast strip edge is markedly enhanced.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Continuous Casting (AREA)
Abstract
A casting roll moving apparatus for a twin roll type continuous strip casting process is disclosed. The casting roll moving apparatus is used with a twin roll type strip casting machine that produces a strip through a method in which, while high-temperature steel melt is supplied between twin rolls which rotate in opposite direction, a large amount of heat is dissipated through the rolls by contact between the steel melt and the rolls, so that the steel melt is rapidly solidified. Opposite ends of the rolls are automatically aligned, so that the recovery rate of the apparatus is increased, and a stable casting process is ensured. Because friction of the apparatus is markedly reduced so that an even rolling force is ensured, a gap between the rolls is maintained constant. Thus, the thickness of a cast strip is maintained constant, and the problem of the occurrence of an uneven surface pattern is solved.
Description
- The present invention relates, in general, to casting roll moving apparatuses for twin roll type continuous strip casting machines which have structures such that casting rolls can smoothly move with reduced friction, and in which, if opposite ends of the casting roll become misaligned, they are automatically realigned and, more particularly, to a casting roll moving apparatus for a twin roll type continuous strip casting process which supports casting rolls using hydraulic pressure and reduces friction through the formation of fluid films during a casting process, so that, if opposite ends of the casting rolls become misaligned by the application of uneven rolling force to the casting rolls, or if the gap between the casting rolls becomes uneven due to longitudinal outside force or due to skull entering between the casting rolls, the casting rolls are automatically realigned, that is, are returned to the original positions thereof.
- As well known to those skilled in the art, an S/C (strip casting) process is a process of producing a cast strip 3 by supplying a steel melt 2 between two
rolls 1, which are rotating. - In a twin roll type strip casting machine of the S/C process, edge dams are coupled to opposite ends of the casting rolls such that steel melt is prevented from leaking, thus forming a steel melt pool for supplying steel melt between the casting rolls.
- The steel melt is solidified while passing through the steel melt pool and is produced into a cast strip after passing through a roll nip.
- In the steel melt pool, solidifying shells meet each other and are depressed at high temperature, thus being produced into a cast strip having a plate shape. The point at which the solidifying shells meet each other is called a solidification completion point, and the next section is called a thermal deformation section.
- The thermal deformation section has the same role as a hot rolling line. Furthermore, a rolling force is generated by roll separation force when passing the thermal deformation section.
- As well, to maintain the thickness of a cast strip constant, the two rolls are continuously moved such that the distance between the two rolls is maintained.
- Here, the generated rolling force is divided into pressure due to solidification and rolling force due to friction at a lower position resulting from movement of the rolls.
- The rolling force due to friction generates the hunting of the rolling force during a casting process.
- This is generated in every casting process and causes uneven rolling force.
- Hence, the surface of the cast strip may deteriorate. That is, a defect, in which uneven patterns are formed on the surface, may occur.
- Furthermore,
FIG. 2 shows the case in which the opposite ends of the rolls are undesirably misaligned or a gap between the rolls is made uneven by longitudinal outside force or by an uneven increase in the distance between the rolls due to skulls that enter between the rolls. - These directly affect the quality of strip edges, thus the casting process becomes unstable, for example, the recovery rate is reduced or a defective winding phenomenon is caused. In addition, the casting process may be interrupted.
- These problems occur because the opposite ends of the rolls, which have been misaligned, cannot be rapidly returned to the original states thereof by the friction of a moving apparatus, which is provided under the rolls, and because the conventional art has no means for rapidly returning the rolls to the original states thereof during the casting process.
- Conventional techniques for solving the above problems are classified into two kinds of techniques. The first conventional technique is related to a strip casting (S/C) process, and the second conventional technique is related to a hydrostatic bearing.
- A slide guide technique is one strip casting related technique. A slide guide slides on a wear plate using grease applied to the wear plate.
- This method has been used in a hot rolling mill and in a medium cast.
- In the hot rolling mill, this method is appropriate, because rolls must be moved as required and a slab is in a stationary state.
- However, in the S/C process, because steel melt in a liquid phase is treated and roll edges must be reliably sealed, it is inappropriate to use this method.
- Meanwhile, there is an LM guide (linear motion guide). As shown in
FIG. 3 , the LM guide includes a rail 6 and a carriage 5. A sliding bearing is installed in the LM guide. The LM guide is widely used in an automation system. - However, in the case that it is used for a long time, durability thereof is reduced by heat generated by friction. Furthermore, there is a problem in that it is difficult to realign the opposite ends of the LM guide when the LM guide is misaligned by outside force.
- In the conventional technique related to the hydrostatic bearing, there is the case in which the hydrostatic bearing is used in an LM guide. However, because this incorporates a rail and carriage, a problem in which the LM guide twists cannot be solved.
- Technical Tasks to be Solved by the Invention
- Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a casting roll moving apparatus of a twin roll type continuous strip casting process which is operated by hydraulic pressure and forms fluid films to reduce friction, and in which, if overload is applied to rolls, the rolls are automatically realigned, thus solving problems of misalignment of the opposite ends of the rolls and of unstable rolling force and unstable roll gap during a casting process.
- Technical Solution
- In order to accomplish the above object, the present invention provides a casting roll moving apparatus which can be used with a twin roll type strip casting machine that produces a strip through a method in which, while high-temperature steel melt is supplied between twin rolls which rotate in opposite direction, a large amount of heat is dissipated through the rolls by contact between the steel melt and the rolls, so that the steel melt is rapidly solidified.
- The present invention provides a casting roll moving apparatus of a twin roll type continuous strip casting process, including: a bearing housing supporting a casting roll shaft; a saddle coupled to the lower end of the bearing housing, with a sliding protrusion vertically protruding from a lower surface of the saddle; a mill frame having therein a receiving space so that the sliding protrusion of the saddle is movably inserted in the receiving space, pads provided on respective opposite sidewalls of the receiving space of the mill frame such that the pads are parallel to respective opposite side surfaces of the sliding protrusion of the saddle, and a shoe provided on the bottom of the receiving space such that the shoe is parallel to the lower surface of the sliding protrusion; and a hydraulic pressure supplying means for supplying fluid to opposite sidewalls and the bottom of the receiving space of the mill frame. The fluid supplying means includes a fluid storage tank storing the fluid, and a fluid distribution pipe line distributing the fluid from the fluid storage tank to the receiving space.
- Furthermore, in the present invention, each of the shoe and the pads has a nozzle to discharge the fluid to the sliding protrusion. The shoe and the pads comprise two or more shoes and pads such that hydraulic pressure is evenly applied to the overall opposite side surfaces and the overall lower surface of the sliding protrusion. Hydraulic pressures, which are substantially equal to each other, are applied between the pads and the sliding protrusion of the saddle. The casting roll moving apparatus further includes a fluid discharge pipe provided in the bottom of the receiving space of the mill frame to discharge the fluid, supplied from the hydraulic pressure supplying means, outside the receiving space. The fluid discharge pipe is connected to a circulation pipe so that the fluid is returned to the fluid storage tank. The fluid distribution pipe line includes a shock absorber 22 and a fluid distributor 23.
- Advantageous Effects
- As described above, in the casting roll moving apparatus of the present invention, opposite ends of the casting rolls are automatically aligned, so that the recovery rate of the apparatus is increased, and a stable casting process is ensured. Furthermore, because friction of the apparatus is markedly reduced, by which even rolling force is ensured, the gap between the rolls is maintained constant. Thus, the thickness of a cast strip becomes even, and a problem of an uneven surface pattern is solved.
-
FIG. 1 is a schematic view showing a conventional twin roll type continuous strip casting process; -
FIG. 2 is views showing examples of defective arrangement of rolls in the conventional art; -
FIG. 3 is a view showing an example of a typical LM (linear motion guide); -
FIG. 4 is a schematic view of a casting roll moving apparatus according to an embodiment of the present invention; -
FIG. 5 is an illustrative view showing the operation of the casting roll moving apparatus according to the present invention; -
FIG. 6 is a view showing an operating structure of the casting roll moving apparatus according to the present invention; -
FIG. 7 is graphs comparing the results of rolling force tests between the moving apparatus of the present invention and the conventional moving apparatus; and -
FIG. 8 is pictures comparing the edges of cast strips using the moving apparatus of the present invention and using the conventional moving apparatus. - Hereinafter, the present invention will be described in detail with reference to the attached drawings.
-
FIG. 4 is a schematic view of a casting roll moving apparatus according to an embodiment of the present invention.FIG. 5 is an illustrative view showing the operation of the casting roll moving apparatus of the present invention. - Referring to the drawings, in the casting roll moving apparatus of the present invention, bearing
housings 11 surround and support a roll shaft 1-1, which is integrated with acasting roll 1. Furthermore, each bearinghousing 11 is coupled to eachmill frame 13 through asaddle 12. A sliding protrusion 12-1 protrudes downwards from a central portion of the lower surface of eachsaddle 12. Furthermore, thesaddle 12 is coupled to the lower surface of the bearinghousing 11 using bolts or the like. - Each
mill frame 13 has in an upper surface thereof a receivingspace 16, in which the sliding protrusion 12-1 is movably inserted.Pads 15 are attached to the opposite sidewalls of the receivingspace 16 such that the sliding protrusion 12-1 and thepads 15 maintain constant distance therebetween and are parallel to each other. Ashoe 14 is provided on the bottom of the receivingspace 16 such that it is parallel to and maintains a constant distance from the lower surface of the sliding protrusion 12-1. A nozzle 17 for discharging fluid to the sliding protrusion 12-1 is installed in each of theshoes 14 and thepads 15. It is preferable that two or more nozzles 17 be provided at positions corresponding to the sliding protrusion 12-1 to evenly apply pressure to the sidewalls and the lower surface of the sliding protrusion 12-1. - A
fluid storage tank 18 and a fluiddistribution pipe line 20 for supplying fluid into the receivingspace 16 of themill frame 13 and acirculation pipe 21 for returning used fluid from the receivingspace 16 to thefluid storage tank 18 are provided outside themill frame 13. - The fluid
distribution pipe line 20 is coupled to theshoe 14 and thepads 15 of the receivingspace 16, and thefluid circulation pipe 21 is connected to afluid discharge pipe 19, which is provided in the bottom of the receivingspace 16. - In the present invention, having the above-mentioned construction, during a casting process, fluid is continuously supplied at a constant pressure to the
shoe 14 and thepads 15 of the receivingspace 16 through thefluid distribution 20. The supplied fluid is discharged to the opposite sidewalls and the lower surface of the sliding protrusion 12-1 of the saddle at the same pressure through the nozzles 17, thus forming fluid films thereon. - Therefore, the sliding protrusion 12-1 maintains the initial position thereof because fluid is discharged to the opposite sidewalls of the sliding protrusion 12-1 at even pressure. Thereby, the casting
roll 1 can also maintain the original position thereof, thus making a normal casting operation possible. - As shown in
FIGS. 5( a), during the casting process, when the roll is moved in one direction by outside force applied to the roll, a difference in hydraulic pressure occurs between the opposite sidewalls of the sliding protrusion. That is, hydraulic pressure is increased at the side at which the gap is reduced, so that the roll is automatically returned to the original position thereof while the uneven hydraulic pressure state is changed to an even hydraulic pressure state. - As shown in
FIGS. 5( b), even when the opposite ends of the roll are moved in different directions because uneven outside force is applied to the roll, hydraulic pressure is increased at the side at which the gap is reduced, thus the roll is automatically returned to the original position thereof. - As such, in the present invention, fluid films are formed both between the sliding protrusion and the pads and between the sliding protrusion and the shoe by hydraulic pressure discharged from the shoe and the pads, thus the saddle can smoothly move with reduced friction. Furthermore, the saddle can be automatically returned to the original position thereof by hydraulic pressure, which is evenly discharged.
- The hunting values of rolling forces, cast strip edges and wound conditions between a coil manufactured using the apparatus of the present invention and a coil manufactured using the conventional apparatus were compared.
- The results were shown in
FIGS. 7 and 8 . - As shown in
FIG. 7 , it is appreciated that the data loading value of the rolling force of the apparatus of the present invention is markedly improved compared to that of the conventional apparatus. - In detail, the hunting value of the rolling force, which was +−3 ton, is reduced to +−0.5 ton. Thereby, stability of the roll gap is realized, so that variation in the thickness of the cast strip is reduced.
- That is, in the conventional art, variation in the thickness of the cast strip in the longitudinal direction ranges from 70 to 100 microns, but, in the present invention, it is reduced to 20 to 30 microns. This is very important in the art, because the variation in thickness of the cast strip affects a subsequent rolling process.
- Furthermore, as shown in
FIG. 8 , the cast strip edge and the winding condition of the present invention were also found to be superior to those of the conventional art. It is assumed that this was achieved because the arrangement of opposite ends of the casting rolls was satisfactory thanks to the maintenance of stiffness by preloading. As a result, the recovery rate of the cast strip edge is markedly enhanced.
Claims (10)
1. A casting roll moving apparatus for a twin roll type continuous strip casting process, comprising:
a bearing housing (11) supporting a casting roll shaft (1-1);
a saddle (12) coupled to a lower end of the bearing housing (11), with a sliding protrusion (12-1) vertically protruding from a lower surface of the saddle (12);
a mill frame (13) having therein a receiving space (16), so that the sliding protrusion (12-1) of the saddle (12) is movably inserted in the receiving space (16); and
hydraulic pressure supplying means for supplying fluid to opposite sidewalls and a bottom of the receiving space (16) of the mill frame (13).
2. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 1 , wherein the saddle (12) is coupled to the bearing housing (11) using a bolt.
3. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 1 , further comprising:
pads (15) provided on respective opposite sidewalls of the receiving space (16) of the mill frame such that the pads (15) are parallel to respective opposite side surfaces of the sliding protrusion (12-1) of the saddle; and
a shoe (14) provided on the bottom of the receiving space (16) such that the shoe (14) is parallel to a lower surface of the sliding protrusion (12-1).
4. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 3 , wherein each of the shoe (14) and the pads (15) has a nozzle (17) to discharge the fluid to the sliding protrusion (12-1).
5. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 3 , wherein the shoe (14) and the pads (15) comprise two or more shoes (14) and pads (15) such that hydraulic pressure is evenly applied to all of both of the opposite side surfaces and the entire lower surface of the sliding protrusion (12-1).
6. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 3 , wherein hydraulic pressures, which are substantially equal to each other, are applied between the pads (15) and the sliding protrusion (12-1) of the saddle.
7. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 1 , wherein the fluid supplying means comprises a fluid storage tank (18) storing the fluid, and a fluid distribution pipe line (20) distributing the fluid from the fluid storage tank (18) to the receiving space (16).
8. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 1 , further comprising:
a fluid discharge pipe (19) provided in the bottom of the receiving space (16) of the mill frame to discharge the fluid, supplied from the hydraulic pressure supplying means, outside the receiving space (16).
9. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 8 , wherein the fluid discharge pipe (19) is connected to a circulation pipe (21) so that the fluid is restored into the fluid storage tank (18).
10. The casting roll moving apparatus for the twin roll type continuous strip casting process according to claim 7 , wherein the fluid distribution pipe line (20) comprises a shock absorber (22) and a fluid distributor (23).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020050130387A KR100650563B1 (en) | 2005-12-27 | 2005-12-27 | Casting roll moving apparatus of twin roll type continuous strip casting process |
KR10-2005-0130387 | 2005-12-27 | ||
PCT/KR2006/000972 WO2007074955A1 (en) | 2005-12-27 | 2006-03-16 | Casting roll moving apparatus of twin roll type continuous strip casting process |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090038771A1 true US20090038771A1 (en) | 2009-02-12 |
Family
ID=37713808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/097,952 Abandoned US20090038771A1 (en) | 2005-12-27 | 2006-03-16 | Casting Roll Moving Apparatus of Twin Roll Type Continuous Strip Casting Process |
Country Status (8)
Country | Link |
---|---|
US (1) | US20090038771A1 (en) |
EP (1) | EP1965937B1 (en) |
JP (1) | JP4794633B2 (en) |
KR (1) | KR100650563B1 (en) |
CN (1) | CN101346201B (en) |
AU (1) | AU2006330313B2 (en) |
DE (1) | DE602006014442D1 (en) |
WO (1) | WO2007074955A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101500145B1 (en) * | 2013-09-23 | 2015-03-06 | 주식회사 포스코 | Adjusting joint unit and twin roll strip caster having thereof |
KR101696049B1 (en) * | 2014-12-24 | 2017-01-13 | 주식회사 포스코 | Oscillation guiding apparatus |
CN113927000B (en) * | 2020-06-29 | 2022-12-16 | 宝山钢铁股份有限公司 | Thin strip continuous casting structure and method for removing cold steel on surface of molten pool thereof |
CN112589155B (en) * | 2020-11-26 | 2021-09-07 | 广州众山精密科技有限公司 | Side jacking device of double-roller rolling mill |
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US4167868A (en) * | 1978-11-27 | 1979-09-18 | The United States Of America As Represented By The Secretary Of The Department Of Transportation | Large hose automatic testing device |
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US20040042689A1 (en) * | 2002-08-30 | 2004-03-04 | Hardinge Inc. | Hydrostatic bearing for linear motion guidance |
US20050129474A1 (en) * | 2004-08-20 | 2005-06-16 | Bourn & Koch, Inc. | Cutting machine for gear shaping or the like |
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JPS5642526U (en) * | 1979-09-10 | 1981-04-18 | ||
JPS56113821A (en) | 1980-02-08 | 1981-09-08 | Hitachi Ltd | Roll neck bearing |
JPH0434995Y2 (en) * | 1986-12-10 | 1992-08-19 | ||
JPH06102255B2 (en) * | 1988-02-27 | 1994-12-14 | 新日本製鐵株式会社 | Twin drum type continuous casting machine |
JPH0430314U (en) * | 1990-07-04 | 1992-03-11 | ||
JP3021168B2 (en) * | 1992-03-19 | 2000-03-15 | 株式会社日立製作所 | Continuous casting equipment for thin sheets |
KR100226902B1 (en) | 1995-12-28 | 1999-10-15 | 이구택 | Device for thickness uniformity of continuous casting thin plate |
EP0903191B1 (en) * | 1997-09-18 | 2003-05-14 | Castrip, LLC | Strip casting apparatus |
AUPP331498A0 (en) | 1998-05-04 | 1998-05-28 | Bhp Steel (Jla) Pty Limited | Twin roll caster |
JP2000002257A (en) * | 1998-06-17 | 2000-01-07 | Nippon Seiko Kk | Rolling bearing |
AUPP852699A0 (en) * | 1999-02-05 | 1999-03-04 | Bhp Steel (Jla) Pty Limited | Strip casting apparatus |
JP3500530B2 (en) * | 1999-04-30 | 2004-02-23 | 株式会社ニイガタマシンテクノ | Spindle device of machine tool and monitoring method thereof |
JP2002219558A (en) | 2001-01-24 | 2002-08-06 | Mitsubishi Heavy Ind Ltd | Twin drum type continuously casting equipment |
-
2005
- 2005-12-27 KR KR1020050130387A patent/KR100650563B1/en active IP Right Grant
-
2006
- 2006-03-16 US US12/097,952 patent/US20090038771A1/en not_active Abandoned
- 2006-03-16 AU AU2006330313A patent/AU2006330313B2/en not_active Ceased
- 2006-03-16 EP EP06716422A patent/EP1965937B1/en not_active Expired - Fee Related
- 2006-03-16 DE DE602006014442T patent/DE602006014442D1/en active Active
- 2006-03-16 WO PCT/KR2006/000972 patent/WO2007074955A1/en active Application Filing
- 2006-03-16 JP JP2008543164A patent/JP4794633B2/en not_active Expired - Fee Related
- 2006-03-16 CN CN2006800492673A patent/CN101346201B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4193644A (en) * | 1977-04-07 | 1980-03-18 | Citizen Watch Co., Ltd. | Servo control system |
US4167868A (en) * | 1978-11-27 | 1979-09-18 | The United States Of America As Represented By The Secretary Of The Department Of Transportation | Large hose automatic testing device |
US6536506B2 (en) * | 2000-06-15 | 2003-03-25 | Castrip Llc | Strip casting |
US20040042689A1 (en) * | 2002-08-30 | 2004-03-04 | Hardinge Inc. | Hydrostatic bearing for linear motion guidance |
US20050129474A1 (en) * | 2004-08-20 | 2005-06-16 | Bourn & Koch, Inc. | Cutting machine for gear shaping or the like |
Also Published As
Publication number | Publication date |
---|---|
EP1965937B1 (en) | 2010-05-19 |
CN101346201A (en) | 2009-01-14 |
WO2007074955A1 (en) | 2007-07-05 |
CN101346201B (en) | 2011-05-25 |
EP1965937A1 (en) | 2008-09-10 |
AU2006330313A1 (en) | 2007-07-05 |
AU2006330313B2 (en) | 2010-08-19 |
JP4794633B2 (en) | 2011-10-19 |
EP1965937A4 (en) | 2009-04-29 |
DE602006014442D1 (en) | 2010-07-01 |
JP2009518186A (en) | 2009-05-07 |
KR100650563B1 (en) | 2006-11-30 |
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