US20070232471A1 - Adiabatic Roll - Google Patents
Adiabatic Roll Download PDFInfo
- Publication number
- US20070232471A1 US20070232471A1 US11/597,240 US59724005A US2007232471A1 US 20070232471 A1 US20070232471 A1 US 20070232471A1 US 59724005 A US59724005 A US 59724005A US 2007232471 A1 US2007232471 A1 US 2007232471A1
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- US
- United States
- Prior art keywords
- heat
- resistant
- metal tub
- tub shaft
- rings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/2469—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollable bodies
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B65/00—Locks or fastenings for special use
- E05B65/0025—Locks or fastenings for special use for glass wings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0012—Rolls; Roll arrangements
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/563—Rolls; Drums; Roll arrangements
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/02—Skids or tracks for heavy objects
- F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
Definitions
- the present invention relates, in general, to an adiabatic roll and, more particularly, to an adiabatic roll which has low thermal conductivity, prevents reduction of the atmospheric temperature of a furnace; and has excellent deformability according to thermal expansion and shrinkage due to changes in temperature when the furnace is operated or stopped.
- a conventional adiabatic roll is exemplified by a carrier roll in a furnace for preheating a slab before hot rolling, and an example is shown in FIG. 7 .
- a plurality of heat-resistant rings 2 for supporting the load of a slab is welded into a water-cooled metal tub shaft 1 .
- Studs 3 made of heat-resistant steel are welded into a portion of a surface of the metal tub shaft 1 other than ring-welded portions, and the resulting structure is coated with heat-resistant mortar 4 , thereby achieving adiabatic construction of the adiabatic roll 6 A.
- the above-mentioned constitution is not disclosed in patent documents.
- the conventional adiabatic roll having the above-mentioned constitution has the following problems.
- the temperature difference between surfaces of the heat-resistant rings and welded parts of the water-cooled metal tub shaft is high, thus resulting in high heat stress. Additionally, because the heat-resistant rings or the metal tub shaft are frequently separated from the welded parts, operation of the furnace must be stopped in order to change the roll.
- an adiabatic structure is formed by applying a heat-resistant mortar
- gaps are formed at interfaces of the heat-resistant rings and the mortar due to shrinkage that occurs when the mortar is dried and cured and due to thermal shrinkage caused by heating during operation of the structure. Heat permeates through the cracks into the water-cooled metal tub shaft, thus increasing fuel consumption and deteriorating the metal tub shaft, resulting in the reduced life of the roll.
- the heat-resistant mortar is easily removed due to a heating cycle associated with operation and stoppage of the furnace, thus making it necessary to renovate the mortar every three or four months.
- an object of the present invention is to provide an adiabatic roll in which heat-resistant rings and disks are not welded into a metal tub shaft but are fitted around the metal tub shaft, so that thermal conductivity is low, the adiabatic roll deforms in accordance with thermal expansion and shrinkage of the heat-resistant rings and thus prevents the formation of cracks and heat loss, the atmospheric temperature of a furnace is not lowered, fuel consumption is not increased, and resistance to impact is excellent.
- the present invention provides an adiabatic roll.
- the adiabatic roll comprises a metal tub shaft 1 which has a through hole 1 A for passing cooling water 20 therethrough, a plurality of heat-resistant rings 2 which is fitted around the metal tub shaft 1 and axially arranged at predetermined intervals between a fixed flange 5 and a movable flange 6 provided on a circumference of the metal tub shaft 1 , and a plurality of disks 7 which is axially arranged between the heat-resistant rings 2 .
- the heat-resistant rings 2 and the disks 7 are fitted around the metal tub shaft 1 without welding.
- each of the heat-resistant rings 2 comprises first and second heat-resistant ring parts 2 A, 2 B which have different diameters and are concentrically arranged on the same vertical axis.
- the present invention also provides an adiabatic roll characterized in that the first and second heat-resistant ring parts 2 A, 2 B of the heat-resistant rings 2 are joined together using a pair of ring-shaped plates 2 D and round head screws 2 E axially threaded into the ring-shaped plates 2 D at a joint 2 M thereof.
- the present invention also provide an adiabatic roll characterized in that metal tub shaft key grooves 1 d are formed on an external wall of the metal tub shaft 1 , key grooves 2 C are formed on internal walls of the heat-resistant rings 2 , and the heat-resistant rings 2 are fitted around the metal tub shaft 1 by keys 10 which engage with the metal tub shaft key grooves 1 d and the key grooves 2 C.
- the present invention also provides an adiabatic roll characterized in that metal tub shaft key grooves 1 d are formed on an external wall of the metal tub shaft 1 , key grooves 2 C are formed on internal walls of the second heat-resistant ring parts 2 B having relatively smaller diameters among the heat-resistant rings 2 , and the second heat-resistant ring parts 2 B are fitted around the metal tub shaft 1 by keys 10 which engage with the metal tub shaft key grooves 1 d and the key grooves 2 C.
- the present invention also provides an adiabatic roll characterized in that the heat-resistant rings 2 are partially or entirely made of ceramic.
- the present invention also provides an adiabatic roll characterized in that the external first heat-resistant ring part 2 A of each of the heat-resistant rings 2 is made of nickel•cobalt or stainless steel, and the internal second heat-resistant ring part 2 B of each of the heat-resistant rings 2 is made of ceramic.
- An adiabatic roll of the present invention having the above-mentioned structure provides the following effects.
- heat-resistant rings which constitute an external surface part of the roll have excellent resistance to abrasion and impact, and can endure a load occurring in the course of carrying a slab during a hot rolling process and also endure abrasion and impact. Furthermore, the heat-resistant rings are fitted around a water cooled metal tub shaft, thereby reducing heat loss through the metal tub shaft due to heat conduction and preventing separation of the heat-resistant rings from the metal tub shaft due to heat stress. Additionally, heat-resistant rings having larger and smaller diameters are used in example 2, thus reducing thermal conductivity. SUS310S, instead of only using costly nickel•cobalt-based heat-resistant steel, is used to manufacture the rings, thus minimizing cost.
- heat-resistant ceramic rings are used, thereby preventing heat loss due to heat conduction.
- the disks made of inorganic material are axially restored by 15 mm (25%) so as to sufficiently absorb 1.5 mm (calculated when the entire ring is at 1200° C.: linear expansion coefficient 17.8 ⁇ 10 ⁇ 6 ) which corresponds to the change in axial thermal expansion of the rings made of nickel-cobalt-based heat-resistant steel, thereby preventing the occurrence of gaps.
- the present invention can be applied to an adiabatic roll for manufacturing iron and other carrier equipment at high temperatures.
- FIG. 1 is a longitudinal sectional view of an adiabatic roll according to the present invention
- FIG. 2 is a longitudinal sectional view of the roll of FIG. 1 , which is to be tested;
- FIG. 3 is a sectional view taken in the direction of arrows along the line Y-Y of FIG. 2 ;
- FIG. 4 is a sectional view of a main part of FIG. 2 ;
- FIG. 5 is a transverse sectional view of another type of ring, which is different from that of FIG. 3 ;
- FIG. 6 is a longitudinal sectional view of FIG. 5 ;
- FIG. 7 is a longitudinal sectional view of a conventional adiabatic roll.
- metal tub shaft 1A through hole for passing cooling water therethrough
- 1a end 1b: the other end 1c: threaded part
- 1d metal tub shaft key groove
- 2 heat-resistant ring 2C: key groove 5: fixed flange 6: movable flange 7: disk 8: nut 10: key 6A: adiabatic roll
- 2A first heat-resistant ring part
- 2B second heat-resistant ring part
- 2D ring-shaped plate 2E: round head screw
- reference numeral 1 denotes a tub-shaped metal tub shaft which has a through hole 1 A for guiding cooling water therethrough.
- a fixed flange 5 is welded into a circumference of an end 1 a of the metal tub shaft 1 , and a movable flange 6 is provided at the other end 1 b thereof.
- the movable flange 6 is axially and elastically supported by a nut 8 , which is screwed around an externally threaded part 1 c of the other end 1 b.
- Disks 7 made of a predetermined material for example, plural sheets of ring-shaped inorganic material which includes a non-asbestos containing ASK#2057 manufactured by ASKtechnika Co. in Japan
- nickel•cobalt-based heat-resistant rings 2 are axially fitted around the metal tub shaft 1 between the flanges 5 , 6 .
- the heat-resistant rings 2 and the disks 7 are fitted around the metal tub shaft 1 without welding.
- the roll 6 A having a structure shown in FIG. 1 When the adiabatic roll 6 A having a structure shown in FIG. 1 is subjected to a characteristic test, the roll may be as shown in FIGS. 2 to 4 . However, with respect to the basic principle, all of the structures shown in FIGS. 1 to 4 constitute the same adiabatic roll 6 A according to the present invention.
- a pair of metal tub shaft key grooves 1 d is formed with a 180° interval on an external wall of the metal tub shaft 1 shown in FIGS. 1 to 4 so that they are opposite to each other.
- a pair of key grooves 2 C is formed on an internal wall of each heat-resistant ring 2 , and keys 10 are inserted into spaces formed by the key grooves 1 d , 2 C. Accordingly, it is impossible to circumferentially rotate the heat-resistant rings 2 with respect to the metal tub shaft 1 , but the rings can axially move.
- the heat-resistant rings 2 are not axially fixed, but can axially move while they are interposed between the disks 7 made of inorganic material when thermal expansion and shrinkage occur.
- a design is conducted so as to sufficiently compensate for circumferential thermal expansion and shrinkage, thus preventing idling of the heat-resistant rings 2 caused by impact applied in a rotational direction (circumferential direction) in the course of carrying a slab.
- the disks 7 which act as a spring prevent gaps from occurring and the heat-resistant rings 2 are not fixed. Accordingly, the generation of heat stress is reduced and it is possible to prevent separation.
- the heat-resistant rings 2 are fitted around the water-cooled metal tub shift 1 , thus providing resistance to heat transfer at interfaces of the rings and the shaft, thereby decreasing the amount of heat transferred.
- An adiabatic roll ( 6 A) having the size shown in FIGS. 2 to 4 was manufactured, and heated at 1200° C. in a siliconit furnace 11 , indicated by a dotted line. Temperatures of portions of nickel•cobalt-based heat-resistant rings (xA to xD portions in FIGS. 3 and 4 ) were measured, and inlet and outlet temperatures of cooling water 20 were measured, so that the amount of heat loss was compared with that of a conventional welding structure or heat-resistant mortar adiabatic structure. Furthermore, whether gaps were formed at interfaces of the heat-resistant rings 2 and adiabatic material was visually confirmed.
- heat-resistant rings 2 were welded into a water-cooled metal tub shaft 1 in an adiabatic roll 6 A shown in FIG. 7 , and Y members 3 were welded into a portion of the metal tub shaft 1 , at which disks 7 made of inorganic material were provided.
- Asahi light caster-13 (LC-13) manufactured by Asahi Glass Co., Ltd. was mixed therewith to produce a structure 4 which contained 35 wt % heat-resistant mortar and had an external diameter of 280, and comparison tests were conducted.
- the amount of cooling water used was 3 L/min.
- the nickel•cobalt-based heat-resistant ring 2 was the same as described in example 1 except that it consisted of a first heat-resistant ring part 2 A having a larger diameter and a second heat-resistant ring part 2 B having a smaller diameter so that they were concentrically arranged on the same vertical axis as shown in FIGS. 5 and 6 , and the second heat-resistant ring part 2 B constituting the internal ring part was made of SUS310S. Furthermore, ring-shaped plates 2 D and round head screws 2 E were provided at a joint 2 M so as to join the first and second heat-resistant ring parts 2 A, 2 B together. The remaining test conditions were the same as those of example 1.
- the second heat-resistant ring part 2 B which constituted the internal ring part of the first and second heat-resistant ring parts 2 A, 2 B of example 2, was made of an Al 2 O 3 ceramic sintered body instead of SUS310S.
- the remaining test conditions were the same as those of example 1.
- the heat-resistant ring 2 of example 1 was made of an Al 2 O 3 ceramic sintered body instead of nickel-cobalt-based heat-resistant steel.
- the remaining test conditions were the same as those of example 1.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
- The present invention relates, in general, to an adiabatic roll and, more particularly, to an adiabatic roll which has low thermal conductivity, prevents reduction of the atmospheric temperature of a furnace; and has excellent deformability according to thermal expansion and shrinkage due to changes in temperature when the furnace is operated or stopped.
- A conventional adiabatic roll is exemplified by a carrier roll in a furnace for preheating a slab before hot rolling, and an example is shown in
FIG. 7 . A plurality of heat-resistant rings 2 for supporting the load of a slab is welded into a water-cooledmetal tub shaft 1.Studs 3 made of heat-resistant steel are welded into a portion of a surface of themetal tub shaft 1 other than ring-welded portions, and the resulting structure is coated with heat-resistant mortar 4, thereby achieving adiabatic construction of theadiabatic roll 6A. However, the above-mentioned constitution is not disclosed in patent documents. - The conventional adiabatic roll having the above-mentioned constitution has the following problems.
- In other words, since rings made of heat-resistant steel are directly welded into a metal tub shaft in the conventional adiabatic roll, heat loss through the water-cooled metal tub shaft is high, and the atmospheric temperature of a furnace is reduced or fuel consumption increases.
- Furthermore, the temperature difference between surfaces of the heat-resistant rings and welded parts of the water-cooled metal tub shaft is high, thus resulting in high heat stress. Additionally, because the heat-resistant rings or the metal tub shaft are frequently separated from the welded parts, operation of the furnace must be stopped in order to change the roll.
- Also, since an adiabatic structure is formed by applying a heat-resistant mortar, gaps are formed at interfaces of the heat-resistant rings and the mortar due to shrinkage that occurs when the mortar is dried and cured and due to thermal shrinkage caused by heating during operation of the structure. Heat permeates through the cracks into the water-cooled metal tub shaft, thus increasing fuel consumption and deteriorating the metal tub shaft, resulting in the reduced life of the roll.
- Additionally, the heat-resistant mortar is easily removed due to a heating cycle associated with operation and stoppage of the furnace, thus making it necessary to renovate the mortar every three or four months.
- Therefore, an object of the present invention is to provide an adiabatic roll in which heat-resistant rings and disks are not welded into a metal tub shaft but are fitted around the metal tub shaft, so that thermal conductivity is low, the adiabatic roll deforms in accordance with thermal expansion and shrinkage of the heat-resistant rings and thus prevents the formation of cracks and heat loss, the atmospheric temperature of a furnace is not lowered, fuel consumption is not increased, and resistance to impact is excellent.
- The present invention provides an adiabatic roll. The adiabatic roll comprises a
metal tub shaft 1 which has a throughhole 1A for passingcooling water 20 therethrough, a plurality of heat-resistant rings 2 which is fitted around themetal tub shaft 1 and axially arranged at predetermined intervals between a fixed flange 5 and amovable flange 6 provided on a circumference of themetal tub shaft 1, and a plurality ofdisks 7 which is axially arranged between the heat-resistant rings 2. The heat-resistant rings 2 and thedisks 7 are fitted around themetal tub shaft 1 without welding. - The present invention also provides an adiabatic roll characterized in that each of the heat-
resistant rings 2 comprises first and second heat-resistant ring parts - The present invention also provides an adiabatic roll characterized in that the first and second heat-
resistant ring parts resistant rings 2 are joined together using a pair of ring-shaped plates 2D andround head screws 2E axially threaded into the ring-shaped plates 2D at ajoint 2M thereof. - The present invention also provide an adiabatic roll characterized in that metal tub shaft key grooves 1 d are formed on an external wall of the
metal tub shaft 1,key grooves 2C are formed on internal walls of the heat-resistant rings 2, and the heat-resistant rings 2 are fitted around themetal tub shaft 1 bykeys 10 which engage with the metal tub shaft key grooves 1 d and thekey grooves 2C. - The present invention also provides an adiabatic roll characterized in that metal tub shaft key grooves 1 d are formed on an external wall of the
metal tub shaft 1,key grooves 2C are formed on internal walls of the second heat-resistant ring parts 2B having relatively smaller diameters among the heat-resistant rings 2, and the second heat-resistant ring parts 2B are fitted around themetal tub shaft 1 bykeys 10 which engage with the metal tub shaft key grooves 1 d and thekey grooves 2C. - The present invention also provides an adiabatic roll characterized in that the heat-
resistant rings 2 are partially or entirely made of ceramic. - The present invention also provides an adiabatic roll characterized in that the external first heat-
resistant ring part 2A of each of the heat-resistant rings 2 is made of nickel•cobalt or stainless steel, and the internal second heat-resistant ring part 2B of each of the heat-resistant rings 2 is made of ceramic. - An adiabatic roll of the present invention having the above-mentioned structure provides the following effects.
- In the adiabatic roll of the present invention, heat-resistant rings which constitute an external surface part of the roll have excellent resistance to abrasion and impact, and can endure a load occurring in the course of carrying a slab during a hot rolling process and also endure abrasion and impact. Furthermore, the heat-resistant rings are fitted around a water cooled metal tub shaft, thereby reducing heat loss through the metal tub shaft due to heat conduction and preventing separation of the heat-resistant rings from the metal tub shaft due to heat stress. Additionally, heat-resistant rings having larger and smaller diameters are used in example 2, thus reducing thermal conductivity. SUS310S, instead of only using costly nickel•cobalt-based heat-resistant steel, is used to manufacture the rings, thus minimizing cost.
- Furthermore, heat-resistant ceramic rings are used, thereby preventing heat loss due to heat conduction.
- Furthermore, since disks made of inorganic material are used in an adiabatic part, no gaps or cracks occur at the interfaces of the heat-resistant rings with the adiabatic disks because of the cushiony disks, and direct inflow of heat to the water-cooled metal tub shaft is prevented. In addition, if nuts tightening the disks are loosened after the adiabatic roll is tested in example 1, the disks made of inorganic material are axially restored by 15 mm (25%) so as to sufficiently absorb 1.5 mm (calculated when the entire ring is at 1200° C.: linear expansion coefficient 17.8×10−6) which corresponds to the change in axial thermal expansion of the rings made of nickel-cobalt-based heat-resistant steel, thereby preventing the occurrence of gaps.
- The present invention can be applied to an adiabatic roll for manufacturing iron and other carrier equipment at high temperatures.
-
FIG. 1 is a longitudinal sectional view of an adiabatic roll according to the present invention; -
FIG. 2 is a longitudinal sectional view of the roll ofFIG. 1 , which is to be tested; -
FIG. 3 is a sectional view taken in the direction of arrows along the line Y-Y ofFIG. 2 ; -
FIG. 4 is a sectional view of a main part ofFIG. 2 ; -
FIG. 5 is a transverse sectional view of another type of ring, which is different from that ofFIG. 3 ; -
FIG. 6 is a longitudinal sectional view ofFIG. 5 ; and -
FIG. 7 is a longitudinal sectional view of a conventional adiabatic roll. -
1: metal tub shaft 1A: through hole for passing cooling water therethrough 1a: end 1b: the other end 1c: threaded part 1d: metal tub shaft key groove 2: heat- resistant ring 2C: key groove 5: fixed flange 6: movable flange 7: disk 8: nut 10: key 6A: adiabatic roll 2A: first heat- resistant ring part 2B: second heat- resistant ring part 2D: ring- shaped plate 2E: round head screw - A description will now be provided for an adiabatic roll of the present invention with reference to the accompanying drawings. Furthermore, the same reference numerals are used throughout the different drawings to designate the same or similar components.
- In
FIG. 1 ,reference numeral 1 denotes a tub-shaped metal tub shaft which has a throughhole 1A for guiding cooling water therethrough. A fixed flange 5 is welded into a circumference of an end 1 a of themetal tub shaft 1, and amovable flange 6 is provided at the other end 1 b thereof. Themovable flange 6 is axially and elastically supported by anut 8, which is screwed around an externally threaded part 1 c of the other end 1 b. -
Disks 7 made of a predetermined material (for example, plural sheets of ring-shaped inorganic material which includes a non-asbestos containing ASK#2057 manufactured by ASK Technika Co. in Japan) and nickel•cobalt-based heat-resistant rings 2 are axially fitted around themetal tub shaft 1 between theflanges 5, 6. When thenut 8 is screwed to be moved toward to press the fixed flange 5, thedisks 7 and the heat-resistant rings 2 are pressed and elastically and firmly supported, thereby creating anadiabatic roll 6A. - Furthermore, the heat-
resistant rings 2 and thedisks 7 are fitted around themetal tub shaft 1 without welding. - When the
adiabatic roll 6A having a structure shown inFIG. 1 is subjected to a characteristic test, the roll may be as shown in FIGS. 2 to 4. However, with respect to the basic principle, all of the structures shown in FIGS. 1 to 4 constitute the sameadiabatic roll 6A according to the present invention. - A pair of metal tub shaft key grooves 1 d is formed with a 180° interval on an external wall of the
metal tub shaft 1 shown in FIGS. 1 to 4 so that they are opposite to each other. A pair ofkey grooves 2C is formed on an internal wall of each heat-resistant ring 2, andkeys 10 are inserted into spaces formed by thekey grooves 1 d, 2C. Accordingly, it is impossible to circumferentially rotate the heat-resistant rings 2 with respect to themetal tub shaft 1, but the rings can axially move. - In other words, the heat-
resistant rings 2 are not axially fixed, but can axially move while they are interposed between thedisks 7 made of inorganic material when thermal expansion and shrinkage occur. - Furthermore, a design is conducted so as to sufficiently compensate for circumferential thermal expansion and shrinkage, thus preventing idling of the heat-
resistant rings 2 caused by impact applied in a rotational direction (circumferential direction) in the course of carrying a slab. In other words, if axial thermal expansion and shrinkage of the heat-resistant rings 2 occurs, thedisks 7, which act as a spring prevent gaps from occurring and the heat-resistant rings 2 are not fixed. Accordingly, the generation of heat stress is reduced and it is possible to prevent separation. - With respect to heat loss of the water-cooled
metal tub shaft 1 due to heat conduction of the heat-resistant rings 2, unlike a conventional structure in which the rings are welded into the metal tub shaft, the heat-resistant rings 2 are fitted around the water-cooledmetal tub shift 1, thus providing resistance to heat transfer at interfaces of the rings and the shaft, thereby decreasing the amount of heat transferred. - A better understanding of the present invention may be obtained through the following examples, which are set forth to illustrate, but are not to be construed as the limit of the present invention.
- An adiabatic roll (6A) having the size shown in FIGS. 2 to 4 was manufactured, and heated at 1200° C. in a
siliconit furnace 11, indicated by a dotted line. Temperatures of portions of nickel•cobalt-based heat-resistant rings (xA to xD portions inFIGS. 3 and 4 ) were measured, and inlet and outlet temperatures of coolingwater 20 were measured, so that the amount of heat loss was compared with that of a conventional welding structure or heat-resistant mortar adiabatic structure. Furthermore, whether gaps were formed at interfaces of the heat-resistant rings 2 and adiabatic material was visually confirmed. - In the conventional welding structure or heat-resistant mortar adiabatic structure, heat-
resistant rings 2 were welded into a water-cooledmetal tub shaft 1 in anadiabatic roll 6A shown inFIG. 7 , andY members 3 were welded into a portion of themetal tub shaft 1, at whichdisks 7 made of inorganic material were provided. Asahi light caster-13 (LC-13) manufactured by Asahi Glass Co., Ltd. was mixed therewith to produce astructure 4 which contained 35 wt % heat-resistant mortar and had an external diameter of 280, and comparison tests were conducted. The amount of cooling water used was 3 L/min. - The nickel•cobalt-based heat-
resistant ring 2 was the same as described in example 1 except that it consisted of a first heat-resistant ring part 2A having a larger diameter and a second heat-resistant ring part 2B having a smaller diameter so that they were concentrically arranged on the same vertical axis as shown inFIGS. 5 and 6 , and the second heat-resistant ring part 2B constituting the internal ring part was made of SUS310S. Furthermore, ring-shapedplates 2D and round head screws 2E were provided at a joint 2M so as to join the first and second heat-resistant ring parts - The second heat-
resistant ring part 2B, which constituted the internal ring part of the first and second heat-resistant ring parts - The heat-
resistant ring 2 of example 1 was made of an Al2O3 ceramic sintered body instead of nickel-cobalt-based heat-resistant steel. The remaining test conditions were the same as those of example 1. - The results of examples 1, 2, 3, and 4, and a comparative example are described in Table 1.
TABLE 1 Comparative Example 1 Example 2 Example 3 Example 4 Example Temperature Inlet 19 19 19 19 19 of cooling Outlet 41 37 32 27 48 water ° C. Temperatures A 1165 1172 1185 1192 1149 of portions of B 1070 1100 1150 1155 1055 heat-resistant C 921 921 1100 950 843 ring ° C. D 251 225 186 153 255 Heat loss amount of 3960 3240 2340 1440 5220 cooling water Kcal/Hr Appearance of roll No cracks No cracks No cracks No cracks Cracks and after test and no and no and no and no gaps (1.0-1.5 mm) gaps were gaps were gaps were gaps were were formed at formed at formed at formed at formed at the the the the the interface of the interface of interface of interface of interface of heat-resistant the heat- the heat- the heat- the heat- steel ring and resistant resistant resistant resistant the heat- ring and ring and ring and ceramic resistant mortar the the the ring adiabatic adiabatic adiabatic (Al2O3) disk disk disk and the adiabatic disk
Claims (7)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020040035973A KR100578468B1 (en) | 2004-05-20 | 2004-05-20 | Adiabatic Roll |
KR10-2004-0035973 | 2004-05-20 | ||
PCT/KR2005/001189 WO2005113843A1 (en) | 2004-05-20 | 2005-04-26 | Adiabatic roll |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070232471A1 true US20070232471A1 (en) | 2007-10-04 |
Family
ID=35428422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/597,240 Abandoned US20070232471A1 (en) | 2004-05-20 | 2005-04-26 | Adiabatic Roll |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070232471A1 (en) |
EP (1) | EP1751319A4 (en) |
KR (1) | KR100578468B1 (en) |
CN (1) | CN1989260A (en) |
WO (1) | WO2005113843A1 (en) |
Cited By (2)
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US20130310238A1 (en) * | 2010-10-07 | 2013-11-21 | Herakles | Composite material roller for high-temperature annealing |
EP3312536A1 (en) * | 2016-10-14 | 2018-04-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Roller furnace for thermal treatment of an item, uses thereof and method for economical treatment of an object to be fired |
Families Citing this family (4)
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JP2005324244A (en) * | 2004-05-17 | 2005-11-24 | Daehan Dongbang Co Ltd | Heat insulating roll |
CN106270458B (en) * | 2016-08-22 | 2018-11-09 | 合肥东方节能科技股份有限公司 | A kind of rolling guide wheel and preparation method thereof compound based on carbonized ceramic |
CN106077583B (en) * | 2016-08-22 | 2018-05-18 | 合肥东方节能科技股份有限公司 | A kind of Roll Collar of high abrasion Ceramic Composite and preparation method thereof |
DE102018220216A1 (en) | 2018-07-30 | 2020-01-30 | Sms Group Gmbh | Roller for a roller hearth furnace |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130310238A1 (en) * | 2010-10-07 | 2013-11-21 | Herakles | Composite material roller for high-temperature annealing |
US9200668B2 (en) * | 2010-10-07 | 2015-12-01 | Herakles | Composite material roller for high-temperature annealing |
EP3312536A1 (en) * | 2016-10-14 | 2018-04-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Roller furnace for thermal treatment of an item, uses thereof and method for economical treatment of an object to be fired |
Also Published As
Publication number | Publication date |
---|---|
KR100578468B1 (en) | 2006-05-10 |
CN1989260A (en) | 2007-06-27 |
KR20050110979A (en) | 2005-11-24 |
WO2005113843A1 (en) | 2005-12-01 |
EP1751319A1 (en) | 2007-02-14 |
EP1751319A4 (en) | 2009-11-18 |
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