CN104308126A - Cast steel roll electric heating device and electric heating method thereof - Google Patents
Cast steel roll electric heating device and electric heating method thereof Download PDFInfo
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- CN104308126A CN104308126A CN201410501531.9A CN201410501531A CN104308126A CN 104308126 A CN104308126 A CN 104308126A CN 201410501531 A CN201410501531 A CN 201410501531A CN 104308126 A CN104308126 A CN 104308126A
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
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Abstract
The invention discloses a cast steel roll electric heating device and an electric heating method thereof, belongs to technical fields of cast steel roll production equipment and methods, and are used for solving quality problems that the upper roll neck of a cast steel roll are loosened and produce shrinkage cavities, and the like. A graphite electrode of the electric heating device is inserted into molten steel of a dead head, a silicon controlled rectifier heating electric power is electrified, an arc is ignited, and the upper part of a dead head end of a roll is molten under the effect of high temperature of the arc, so that the purpose of feeding is achieved. Different electric heating modes are set in the electric heating method, different electric heating modes are selected according to rolls made of different materials, different molten steel amounts and different dead head diameters, and the optimum heating effect can be achieved. By adopting the electric heating device and the electric heating method adopting the device, the technological yield of the cast steel rolls is improved to 80 to 83 percent from the existing 63 to 68 percent, the quality problems that the upper roll neck of the cast steel roll is loosened and produces shrinkage cavities, and the like are solved, waste products are reduced, the cost consumption is reduced, and remarkable economic benefit is achieved.
Description
Technical field
The present invention is a kind of electrical heating method being applicable to the electric heater unit in cast steel roll production and using this device, belongs to production equipment and the method and technology field of cast steel roll.
Background technology
Cast steel roll is the vitals of milling train, in roll is produced, how to improve the product yield of cast steel roll, and the mass defects such as minimizing is loose, shrinkage cavity are that in roll production process, technical staff and operator focus on the technical problem solved always.In well-established law cast steel roll is produced, former casting technique adopts insulated feeder, and product yield controls at 63%-68%, interval 20-40 minute after casting complete, uses parcel high-temperature molten steel teeming.But in machining process, find that on part roll, rarefaction defect appears in roll neck, has a strong impact on outward appearance and the yield rate of roll, has the roll of particular/special requirement then to cause roll to scrap to some.
Existing electrical heating pattern is: the time period is more than 3 hours, and current strength is 1800A, and voltage strength is 40V.The production that this electrical heating process is used in well-established law cast steel roll can reduce molten steel consumption to a certain extent, but the mass defects such as roll neck on cast steel roll is loose, shrinkage cavity can not be solved completely, and there is coarse grains phenomenon in part cast steel roll, finally cause scrapping, these cast steel rolls that there are quality problems account for 20% of whole electrical heating roll, and therefore every annual meeting causes larger loss.
In light of this situation, be necessary to improve existing cast steel roll production equipment and method.
Summary of the invention
Technical problem to be solved by this invention is to provide application process and the process matched therewith of electric heater unit in cast steel roll production.The application process of this electric heater unit and process matched therewith can improve the product yield of cast steel roll, solve the quality problems such as roll neck on cast steel roll is loose, shrinkage cavity, reduce waste product, reduce cost consumption.
The technical scheme solved the problems of the technologies described above is:
A kind of electric heater unit of cast steel roll, it comprises lifting and guiding device, column, base, telescoping crossbeam, graphite electrode, controllable silicon heating power supply, column is arranged on base, column is provided with lifting and guiding device, one end and the upper end being arranged on column of telescoping crossbeam, the other end of telescoping crossbeam installs graphite electrode, graphite electrode is positioned at the top of roll model, graphite electrode is relative with the upper end of roll model vertically downward, the output cathode of controllable silicon heating power supply is connected with graphite electrode, the output negative pole of controllable silicon heating power supply is connected with roll model.
The electric heater unit of above-mentioned cast steel roll, described base and controllable silicon heating power supply are arranged on flatcar, and track is laid in flatcar bottom, and flatcar wheel and track match.
The electric heater unit of above-mentioned cast steel roll, described lifting and guiding device comprises steel wire rope, steel wire rope guide wheel, ac motor and direction switch, the two ends of steel wire rope are connected with ac motor with telescoping crossbeam respectively, steel wire rope guide wheel is arranged on column bottom, and direction switch is connected with ac motor.
Use a cast steel roll electrical heating method for above-mentioned electric heater unit, it adopts following steps to carry out:
A., after cast steel roll casting complete, first insert one, round steel at cup and be connected with output negative pole, start controllable silicon heating power supply;
B. flatcar is shifted onto the position of positive breaker roll model, with hand switch, graphite electrode is risen, starting front-rear switch utilizes telescoping crossbeam to be moved to by graphite electrode directly over cast steel roll rising head, start decline switch, graphite electrode to be inserted in the molten steel in rising head and to observe voltage, electric current tabular value, at this moment can see the arc light at liquid level place;
C. in rising head, add exothermic mixture, exothermic mixture will cover completely, and not exposed molten steel, adds exothermic mixture in heating process in good time.
Above-mentioned cast steel roll electrical heating method, its controllable silicon heating power supply adopts following four kinds of electrical heating patterns:
The first pattern: the time period is 0-0.5 hour, 0.5-1 hour, 1-1.5 hour, 1.5-2 hour, controllable silicon heating power supply gear is 5 grades, and current strength is 1800A, and voltage strength is 44V;
The second pattern: the time period is 0-0.5 hour, 0.5-1 hour, 1-1.17 hour, 1.17-1.5 hour, controllable silicon heating power supply gear is 6 grades, 6 grades, 6 grades, 7 grades, current strength is 2200A, 2200A, 2200A, 2800A, and voltage strength is 44V;
The third pattern: the time period is 0-2 hour, 2-3 hour, 3-5 hour, 5-5.5 hour, 5.5-6 hour, controllable silicon heating power supply gear is 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, current strength is 2800A, 2200A, 1800A, 1600A, 2800A, and voltage strength is 44V;
4th kind of pattern: the time period is 0-1 hour, 1-2 hour, 2-3 hour, 3-3.5 hour, 3.5-4 hour, controllable silicon heating power supply gear is 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, current strength is 2800A, 2200A, 1800A, 1600A, 2800A, and voltage strength is 44V.
Above-mentioned cast steel roll electrical heating method, ferrosteel roll adopts following different electrical heating pattern according to different molten steel amounts and rising head diameter:
Molten steel amount 10-15 ton, rising head diameter 540-650mm and molten steel amount 15-25 ton, rising head diameter 650-840mm adopt the first pattern; Molten steel amount 25-30 ton, rising head diameter 840-910mm adopt the second pattern; Molten steel amount 30-40 ton, rising head diameter 910-1050mm adopt the 4th kind of pattern.
Above-mentioned cast steel roll electrical heating method, steel alloy steel roll adopts following different electrical heating pattern according to different molten steel amounts and rising head diameter:
Molten steel amount 10-20 ton, rising head diameter 540-840mm adopt the first pattern; Molten steel amount 20-35 ton, rising head diameter 840-900mm adopt the third pattern; Molten steel amount 35-60 ton, rising head diameter 900-1150mm adopt the third pattern.
The invention has the beneficial effects as follows:
The present invention has installed electric heater unit on cast steel roll model side, the graphite electrode of electric heater unit inserts in the molten steel in rising head, and controllable silicon heating power supply is energized, and ignite electric arc, under the high temperature action of electric arc, the rising head end top of roll is melted, reach feeding object.The present invention adopts different electrical heating patterns in electrical heating method, selects different electrical heating patterns for the roll of unlike material, different molten steel amounts and different rising head diameters, can arrive best heating effect.The present invention is by electric heater unit and use the electrical heating method of this device to improve the product yield of cast steel roll, product yield has been brought up to 80%-83% from existing 63%-68%, solve the quality problems such as roll neck on cast steel roll is loose, shrinkage cavity, decrease waste product, reduce cost consumption, considerably improve the economic benefit of enterprise.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, mark is as follows: lifting and guiding device 1, output cathode 2, steel wire rope 3, column 4, base 5, telescoping crossbeam 6, steel wire rope guide wheel 7, ac motor 8, graphite electrode 9, roll model 10, output negative pole 11, controllable silicon heating power supply 12, flatcar 13, track 14.
Detailed description of the invention
Operation principle of the present invention:
380V three-phase alternating current utilizes thyristor supply to convert low-voltage DC to by the present invention, thyristor supply is a special transformer, difference be transformer when connecing load voltage drop little, when thyristor supply connects load, voltage drop is large, this is mainly realized by the inductance value of reconciling magnetic flux and series inductance, thyristor supply is cast steel roll and graphite electrode at the two ends of secondary coil, ignite electric arc, under the high temperature action of electric arc, the rising head end top of roll is melted, reach feeding object.
The present invention is made up of lifting and guiding device 1, output cathode 2, steel wire rope 3, column 4, base 5, telescoping crossbeam 6, steel wire rope guide wheel 7, ac motor 8, graphite electrode 9, roll model 10, output negative pole 11, controllable silicon heating power supply 12, flatcar 13, track 14.
Show in figure, column 4 is arranged on base 5, column 4 is provided with lifting and guiding device 1.Lifting and guiding device 1 comprises steel wire rope 3, steel wire rope guide wheel 7, ac motor 8 and direction switch, the two ends of steel wire rope 3 are connected with ac motor 8 with telescoping crossbeam 6 respectively, steel wire rope guide wheel 7 is arranged on column 4 bottom, and direction switch is connected with ac motor 8.
Show in figure, one end and the upper end being arranged on column 4 of telescoping crossbeam 6, the other end of telescoping crossbeam 6 installs graphite electrode 9, and graphite electrode 9 is positioned at the top of roll model 10, and graphite electrode 9 is relative with the upper end of roll model 10 vertically downward.
Show in figure, the output cathode 2 of controllable silicon heating power supply 12 is connected with graphite electrode 9, and the output negative pole 11 of controllable silicon heating power supply 12 is connected with roll model 10.The controllable silicon heating power supply 12 of one embodiment of the present of invention is KH-3200 type controllable silicon heating power supply.
Show in figure, base 5 and controllable silicon heating power supply 12 are arranged on flatcar 13, and track 14 is laid in flatcar 13 bottom, and flatcar 13 can move along track 14.
Electrical heating method of the present invention, it adopts following steps to carry out:
A., after cast steel roll casting complete, first insert one, diameter of phi 30*1500 round steel at cup and be connected with output negative pole 11, start controllable silicon heating power supply 12;
B. flatcar 13 is shifted onto the position of positive breaker roll model 10, with hand switch, graphite electrode 9 is risen, starting front-rear switch utilizes telescoping crossbeam 6 to move to directly over cast steel roll rising head by graphite electrode 9, start decline switch, graphite electrode 9 to be inserted in the molten steel in rising head and to observe voltage, electric current tabular value, at this moment can see the arc light at liquid level place;
C. in rising head, add exothermic mixture, exothermic mixture will cover completely, and not exposed molten steel, adds exothermic mixture in heating process in good time.
The heating initial stage is due to the impact of molten steel liquid contraction and solidification shrinkage, the ratio shunk is very fast, the equal less stable of electric current, voltage, at this moment operative employee should keep a close eye on voltage, current conditions, the degree of depth that timely adjustment graphite electrode 9 inserts, the whole heating process time used will be determined according to the material of roll, molten steel amount, specification etc.
In the practice of the invention, fill type, Solidification Process Simulation technology with cast steel roll and industrial analysis and prediction of quality are carried out to the forming process of cast steel roll for core, the detailed process of setting of cast steel roll, the completely information such as setting time, upper roll neck porousness can be shown, technologist can be assisted to improve cast steel roll electrical heating process.
The present invention's application InteCast CAE Casting Technological Analysis software fills type, process of setting digital simulation to cast steel roll, carries out industrial analysis and prediction of quality, and adjustment cast steel roll electrical heating process, in the hope of reaching ideal effect.By the test of the cast steel roll electrical heating process to different size, material, constantly improve and obtain following four kinds of successful cast steel roll electrical heating patterns:
The first pattern: the time period is 0-0.5 hour, 0.5-1 hour, 1-1.5 hour, 1.5-2 hour, controllable silicon heating power supply gear is 5 grades, and current strength is 1800A, and voltage strength is 44V;
The second pattern: the time period is 0-0.5 hour, 0.5-1 hour, 1-1.17 hour, 1.17-1.5 hour, controllable silicon heating power supply gear is 6 grades, 6 grades, 6 grades, 7 grades, current strength is 2200A, 2200A, 2200A, 2800A, and voltage strength is 44V;
The third pattern: the time period is 0-2 hour, 2-3 hour, 3-5 hour, 5-5.5 hour, 5.5-6 hour, controllable silicon heating power supply gear is 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, current strength is 2800A, 2200A, 1800A, 1600A, 2800A, and voltage strength is 44V;
4th kind of pattern: the time period is 0-1 hour, 1-2 hour, 2-3 hour, 3-3.5 hour, 3.5-4 hour, controllable silicon heating power supply gear is 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, current strength is 2800A, 2200A, 1800A, 1600A, 2800A, and voltage strength is 44V.
The present invention aborning, selects different electrical heating patterns for the roll of unlike material, different molten steel amounts and different rising head diameters, can arrive best heating effect.
The electrical heating method of above-mentioned use electric heater unit, cast steel roll adopts following different electrical heating pattern according to different materials, molten steel amount and rising head diameter:
Ferrosteel roll adopts following different electrical heating pattern according to different molten steel amounts and rising head diameter:
Molten steel amount 10-15 ton, rising head diameter 540-650mm and molten steel amount 15-25 ton, rising head diameter 650-840mm adopt the first pattern; Molten steel amount 25-30 ton, rising head diameter 840-910mm adopt the second pattern; Molten steel amount 30-40 ton, rising head diameter 910-1050mm adopt the 4th kind of pattern.
Steel alloy steel roll adopts following different electrical heating pattern according to different molten steel amounts and rising head diameter:
Molten steel amount 10-20 ton, rising head diameter 540-840mm adopt the first pattern; Molten steel amount 20-35 ton, rising head diameter 840-900mm adopt the third pattern; Molten steel amount 35-60 ton, rising head diameter 900-1150mm adopt the third pattern.
Below that the cast steel roll of several different size and material adopts before and after electrical heating method and contrasts.
4 kinds of electrical heating patterns after improving are able to extensive use in cast steel roll is produced, and achieve satisfied effect.There is following advantage in this electrical heating process:
(1) can at utmost reduce molten steel consumption, improve cast steel roll product yield;
(2) to completely solve on cast steel roll that roll neck is loose, shrinkage cavity mass defect, do not occur the phenomenon that roll coarse grains causes cast steel roll to be scrapped;
(3) improve the product percent of pass of cast steel roll.
Claims (7)
1. the electric heater unit of a cast steel roll, it is characterized in that: it comprises lifting and guiding device (1), column (4), base (5), telescoping crossbeam (6), graphite electrode (9), controllable silicon heating power supply (12), column (4) is arranged on base (5), column (4) is provided with lifting and guiding device (1), one end and the upper end being arranged on column (4) of telescoping crossbeam (6), the other end of telescoping crossbeam (6) installs graphite electrode (9), graphite electrode (9) is positioned at the top of roll model (10), graphite electrode (9) is relative with the upper end of roll model (10) vertically downward, the output cathode (2) of controllable silicon heating power supply (12) is connected with graphite electrode (9), the output negative pole (11) of controllable silicon heating power supply (12) is connected with roll model (10).
2. the electric heater unit of cast steel roll according to claim 1, it is characterized in that: described base (5) and controllable silicon heating power supply (12) are arranged on flatcar (13), track (14) is laid in flatcar (13) bottom, and flatcar (13) wheel and track (14) match.
3. the electric heater unit of cast steel roll according to claim 2, it is characterized in that: described lifting and guiding device (1) comprises steel wire rope (3), steel wire rope guide wheel (7), ac motor (8) and direction switch, the two ends of steel wire rope (3) are connected with ac motor (8) with telescoping crossbeam (6) respectively, steel wire rope guide wheel (7) is arranged on column (4) bottom, and direction switch is connected with ac motor (8).
4. use a cast steel roll electrical heating method for the electric heater unit of any one cast steel roll of claim 1-3, it is characterized in that, it adopts following steps to carry out:
A., after cast steel roll casting complete, first insert one, round steel at cup and be connected with output negative pole, start controllable silicon heating power supply;
B. flatcar is shifted onto the position of positive breaker roll model, with hand switch, graphite electrode is risen, starting front-rear switch utilizes telescoping crossbeam to be moved to by graphite electrode directly over cast steel roll rising head, start decline switch, graphite electrode to be inserted in the molten steel in rising head and to observe voltage, electric current tabular value, at this moment can see the arc light at liquid level place;
C. in rising head, add exothermic mixture, exothermic mixture will cover completely, and not exposed molten steel, adds exothermic mixture in heating process in good time.
5. cast steel roll electrical heating method according to claim 4, is characterized in that: its controllable silicon heating power supply adopts following four kinds of electrical heating patterns:
The first pattern: the time period is 0-0.5 hour, 0.5-1 hour, 1-1.5 hour, 1.5-2 hour, controllable silicon heating power supply gear is 5 grades, and current strength is 1800A, and voltage strength is 44V;
The second pattern: the time period is 0-0.5 hour, 0.5-1 hour, 1-1.17 hour, 1.17-1.5 hour, controllable silicon heating power supply gear is 6 grades, 6 grades, 6 grades, 7 grades, current strength is 2200A, 2200A, 2200A, 2800A, and voltage strength is 44V;
The third pattern: the time period is 0-2 hour, 2-3 hour, 3-5 hour, 5-5.5 hour, 5.5-6 hour, controllable silicon heating power supply gear is 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, current strength is 2800A, 2200A, 1800A, 1600A, 2800A, and voltage strength is 44V;
4th kind of pattern: the time period is 0-1 hour, 1-2 hour, 2-3 hour, 3-3.5 hour, 3.5-4 hour, controllable silicon heating power supply gear is 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, current strength is 2800A, 2200A, 1800A, 1600A, 2800A, and voltage strength is 44V.
6. cast steel roll electrical heating method according to claim 5, is characterized in that: ferrosteel roll adopts following different electrical heating pattern according to different molten steel amounts and rising head diameter:
Molten steel amount 10-15 ton, rising head diameter 540-650mm and molten steel amount 15-25 ton, rising head diameter 650-840mm adopt the first pattern; Molten steel amount 25-30 ton, rising head diameter 840-910mm adopt the second pattern; Molten steel amount 30-40 ton, rising head diameter 910-1050mm adopt the 4th kind of pattern.
7. cast steel roll electrical heating method according to claim 5, is characterized in that: steel alloy steel roll adopts following different electrical heating pattern according to different molten steel amounts and rising head diameter:
Molten steel amount 10-20 ton, rising head diameter 540-840mm adopt the first pattern; Molten steel amount 20-35 ton, rising head diameter 840-900mm adopt the third pattern; Molten steel amount 35-60 ton, rising head diameter 900-1150mm adopt the third pattern.
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| CN201410501531.9A CN104308126B (en) | 2014-09-27 | 2014-09-27 | A kind of cast steel roll electric heater unit and electrical heating method thereof |
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| CN201410501531.9A CN104308126B (en) | 2014-09-27 | 2014-09-27 | A kind of cast steel roll electric heater unit and electrical heating method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106040985A (en) * | 2016-08-03 | 2016-10-26 | 成都三强轧辊股份有限公司 | Arc heating device and arc heating method for manufacturing cast steel rollers |
| CN110270664A (en) * | 2019-07-24 | 2019-09-24 | 无锡市蠡湖铸业有限公司 | A kind of electroded dead head cover |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106040985A (en) * | 2016-08-03 | 2016-10-26 | 成都三强轧辊股份有限公司 | Arc heating device and arc heating method for manufacturing cast steel rollers |
| CN110270664A (en) * | 2019-07-24 | 2019-09-24 | 无锡市蠡湖铸业有限公司 | A kind of electroded dead head cover |
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| CN104308126B (en) | 2016-08-31 |
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