CN104308126B - A kind of cast steel roll electric heater unit and electrical heating method thereof - Google Patents
A kind of cast steel roll electric heater unit and electrical heating method thereof Download PDFInfo
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- CN104308126B CN104308126B CN201410501531.9A CN201410501531A CN104308126B CN 104308126 B CN104308126 B CN 104308126B CN 201410501531 A CN201410501531 A CN 201410501531A CN 104308126 B CN104308126 B CN 104308126B
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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 electric heater unit of a kind of cast steel roll and electrical heating method thereof, belong to production equipment and the method and technology field of cast steel roll, is used for solving on cast steel roll the quality problems such as loose, the shrinkage cavity of roll neck.The graphite electrode of the electric heater unit of the present invention inserts in the molten steel in rising head, and controllable silicon heating power supply is energized, and ignite electric arc, is melted on the rising head end top of roll, reach feeding purpose under the high temperature action of electric arc.The present invention is provided with 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 optimal heats.The present invention is by electric heater unit and the electrical heating method of this device of use, the product yield of cast steel roll has been brought up to 80% 83% from existing 63% 68%, solve on cast steel roll the quality problems such as loose, the shrinkage cavity of roll neck, decrease waste product, reduce cost consumption, there is significant economic benefit.
Description
Technical field
The present invention is a kind of electric heater unit be applicable to cast steel roll produces and the electrical heating side using this device
Method, belongs to the production Apparatus and method for technical field of cast steel roll.
Background technology
Cast steel roll is the vitals of milling train, in roll produces, how to improve the product yield of cast steel roll, subtracts
The technology that in the mass defects, always roll production process such as few loose, shrinkage cavity, technical staff and operator focus on solving is asked
Topic.In well-established law cast steel roll produces, former casting technique uses insulated feeder, and product yield controls, at 63%-68%, to pour
It is spaced 20-40 minute after one-tenth, uses parcel high-temperature molten steel teeming.But in machining process, find roll neck on part roll
Rarefaction defect occurs, has a strong impact on outward appearance and the yield rate of roll, have the roll of particular/special requirement then to cause roll to scrap some.
Existing electrical heating pattern is: the time period is more than 3 hours, and current intensity is 1800A, and voltage strength is 40V.This
Kind electrical heating process is used in the production of well-established law cast steel roll and can reduce molten steel consumption to a certain extent, but can not solve completely
The certainly mass defect such as loose, the shrinkage cavity of roll neck on cast steel roll, and there is coarse grains phenomenon in part cast steel roll, ultimately results in
Scrapping, these cast steel rolls that there are quality problems account for the 20% of whole electrical heating roll, and every annual meeting thus results in bigger
Loss.
In light of this situation, it is necessary to existing cast steel roll is produced Apparatus and method for and improves.
Summary of the invention
The technical problem to be solved is to provide the application process of electric heater unit during cast steel roll produces and joins
Set technique.The application process of this electric heater unit and process matched therewith can improve the product yield of cast steel roll, solve casting
On steel roll, the quality problems such as loose, the shrinkage cavity of roll neck, reduce waste product, reduce cost consumption.
The technical scheme solving above-mentioned technical problem is:
The electric heater unit of a kind of cast steel roll, it includes lifting and guiding device, column, base, telescoping crossbeam, graphite electricity
Pole, controllable silicon heating power supply, column is arranged on base, and column is provided with lifting and guiding device, one end peace of telescoping crossbeam
Being contained in the upper end of column, the other end of telescoping crossbeam installs graphite electrode, and graphite electrode is positioned at the top of roll model, graphite electricity
Pole is relative with the upper end of roll model vertically downward, and the output cathode of controllable silicon heating power supply is connected with graphite electrode, controlled
The output negative pole of 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, under flatcar
Track is laid in portion, and flatcar wheel matches with track.
The electric heater unit of above-mentioned cast steel roll, described lifting and guiding device includes steel wire rope, steel wire rope guide wheel, alternating current
Motivation and direction switch, the two ends of steel wire rope are connected with telescoping crossbeam and ac motor respectively, and steel wire rope guide wheel is arranged on
Column bottom, direction switch is connected with ac motor.
A kind of cast steel roll electrical heating method using above-mentioned electric heater unit, its employing following steps is carried out:
A., after cast steel roll casting complete, first insert one, round steel at cup and be connected with output negative pole, start controlled
Silicon heating power supply；
B. flatcar is shifted onto the position just to roll model, with hand switch, graphite electrode is risen, start front-rear switch
Utilize telescoping crossbeam to be moved to by graphite electrode directly over cast steel roll rising head, start decline switch, graphite electrode is inserted and emits
In molten steel in Kou and observe voltage, electric current tabular value, can see that the arc light at liquid level；
C. adding exothermic mixture in rising head, exothermic mixture to cover completely, the most exposed molten steel, adds in good time send out in heating process
Thermit powder.
Above-mentioned cast steel roll electrical heating method, its controllable silicon heating power supply employing following four electrical heating pattern:
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 heats
Power supply gear is 5 grades, and current intensity 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, and current intensity 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, and current intensity is 2800A, 2200A, 1800A, 1600A, 2800A, electricity
Compressive 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, and current intensity is 2800A, 2200A, 1800A, 1600A, 2800A, electricity
Compressive Strength is 44V.
Above-mentioned cast steel roll electrical heating method, ferrosteel roll uses following different according to different molten steel amounts and rising head diameter
Electrical heating pattern:
Molten steel amount 10-15 ton, rising head diameter 540-650mm and molten steel amount 15-25 ton, rising head diameter 650-840mm use
The first pattern；Molten steel amount 25-30 ton, rising head diameter 840-910mm use the second pattern；Molten steel amount 30-40 ton, rising head
Diameter 910-1050mm uses the 4th kind of pattern.
Above-mentioned cast steel roll electrical heating method, alloy-steel roll is following not according to different molten steel amounts and the employing of rising head diameter
Same electrical heating pattern:
Molten steel amount 10-20 ton, rising head diameter 540-840mm use the first pattern；Molten steel amount 20-35 ton, rising head diameter
840-900mm uses the third pattern；Molten steel amount 35-60 ton, rising head diameter 900-1150mm use the third pattern.
The invention has the beneficial effects as follows:
The present invention is mounted with electric heater unit by cast steel roll model, and the graphite electrode of electric heater unit inserts in rising head
Molten steel in, controllable silicon heating power supply be energized, ignite electric arc, is melted on the rising head end top of roll under the high temperature action of electric arc
Change, reach feeding purpose.The present invention uses different electrical heating patterns in electrical heating method, for unlike material roll,
Different molten steel amounts and different rising head diameters select different electrical heating patterns, can arrive optimal heats.This
The bright electrical heating method by electric heater unit and this device of use improves the product yield of cast steel roll, technique is gone out
Product rate has brought up to 80%-83% from existing 63%-68%, solves on cast steel roll the quality problems such as loose, the shrinkage cavity of roll neck, subtracts
Lack waste product, reduced cost consumption, considerably improve the economic benefit of enterprise.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
In figure, labelling is as follows: lifting and guiding device 1, output cathode 2, steel wire rope 3, column 4, base 5, telescoping crossbeam 6, steel
Cord 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
The operation principle of the present invention:
380V three-phase alternating current is utilized thyristor supply to be converted into low-voltage DC by the present invention, and thyristor supply is one
Special transformator, except that voltage declines little when transformator connects load, when thyristor supply connects load, voltage declines
Greatly, this is mainly by reconciling what the inductance value of magnetic flux and series inductance realized, and thyristor supply is at the two ends of secondary coil
Being cast steel roll and graphite electrode, ignite electric arc, is melted on the rising head end top of roll under the high temperature action of electric arc, reaches to mend
Contracting purpose.
The present invention is by 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, rail
Road 14 forms.
Showing in figure, column 4 is arranged on base 5, column 4 is provided with lifting and guiding device 1.Lifting and guiding device 1
Including steel wire rope 3, steel wire rope guide wheel 7, ac motor 8 and direction switch, the two ends of steel wire rope 3 respectively with telescoping crossbeam 6 and
Ac motor 8 is connected, and steel wire rope guide wheel 7 is arranged on column 4 bottom, and direction switch is connected with ac motor 8.
Showing in figure, one end of telescoping crossbeam 6 is arranged on the upper end of column 4, and the other end of telescoping crossbeam 6 installs graphite electricity
Pole 9, 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.
Showing in figure, the output cathode 2 of controllable silicon heating power supply 12 is connected with graphite electrode 9, controllable silicon heating power supply
The output negative pole 11 of 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 supplies.
Showing 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,
Flatcar 13 can move along track 14.
The electrical heating method of the present invention, its employing following steps is carried out:
A., after cast steel roll casting complete, first one, diameter of phi 30*1500 round steel and output negative pole are inserted at cup
11 are connected, and start controllable silicon heating power supply 12；
B. flatcar 13 is shifted onto the position just to roll model 10, with hand switch, graphite electrode 9 is risen, before and after starting
Switch utilizes telescoping crossbeam 6 to move to directly over cast steel roll rising head by graphite electrode 9, starts decline switch, by graphite electrode 9
Insert in the molten steel in rising head and observe voltage, electric current tabular value, can see that the arc light at liquid level；
C. adding exothermic mixture in rising head, exothermic mixture to cover completely, the most exposed molten steel, adds in good time send out in heating process
Thermit powder.
The heating initial stage, the ratio of contraction was very fast, and electric current, voltage are the most less due to molten steel liquid contraction and the impact of solidification shrinkage
Stable, at this moment operative employee should keep a close eye on voltage, current conditions, adjusts the degree of depth that graphite electrode 9 inserts in time, whole heated
The Cheng Suoyong time to determine according to the material of roll, molten steel amount, specification etc..
In implementing the present invention, it may, fill type, Solidification Process Simulation technology for core to cast steel with cast steel roll
The forming process of roll carries out industrial analysis and prediction of quality, it is possible to the display detailed process of setting of cast steel roll, solidify completely
The information such as time, upper roll neck porousness, it is possible to assist technologist to improve cast steel roll electrical heating process.
Cast steel roll is filled type, process of setting digital simulation by present invention application InteCast CAE Casting Technological Analysis software, carries out
Industrial analysis and prediction of quality, adjust cast steel roll electrical heating process, in the hope of reaching ideal effect.By to different size, material
The test of the cast steel roll electrical heating process of matter, constantly improves and obtains following four successful cast steel roll electrical heating pattern:
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 heats
Power supply gear is 5 grades, and current intensity 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, and current intensity 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, and current intensity is 2800A, 2200A, 1800A, 1600A, 2800A, electricity
Compressive 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, and current intensity is 2800A, 2200A, 1800A, 1600A, 2800A, electricity
Compressive Strength is 44V.
The present invention aborning, selects not for the roll of unlike material, different molten steel amounts and different rising head diameters
Same electrical heating pattern, can arrive optimal heats.
The electrical heating method of above-mentioned use electric heater unit, cast steel roll is straight according to different materials, molten steel amount and rising head
The following different electrical heating pattern of footpath employing:
Ferrosteel roll is according to different molten steel amounts and the following different electrical heating pattern of rising head diameter employing:
Molten steel amount 10-15 ton, rising head diameter 540-650mm and molten steel amount 15-25 ton, rising head diameter 650-840mm use
The first pattern；Molten steel amount 25-30 ton, rising head diameter 840-910mm use the second pattern；Molten steel amount 30-40 ton, rising head
Diameter 910-1050mm uses the 4th kind of pattern.
Alloy-steel roll is according to different molten steel amounts and the following different electrical heating pattern of rising head diameter employing:
Molten steel amount 10-20 ton, rising head diameter 540-840mm use the first pattern；Molten steel amount 20-35 ton, rising head diameter
840-900mm uses the third pattern；Molten steel amount 35-60 ton, rising head diameter 900-1150mm use the third pattern.
The cast steel roll that the following is several different size and material uses contrast before and after electrical heating method.
4 kinds of electrical heating patterns after improving extensively are applied in cast steel roll produces, and achieve satisfied effect
Really.There is advantages below in this electrical heating process:
(1) can at utmost reduce molten steel consumption, improve cast steel roll product yield；
(2) completely solve on cast steel roll that roll neck is loose, shrinkage cavity mass defect, do not occur that roll coarse grains causes casting
The phenomenon that steel roll is scrapped；
(3) improve the conforming product rate of cast steel roll.
Claims (3)
1. an electrical heating method for cast steel roll, described cast steel roll is ferrosteel roll or alloy-steel roll, and described cast steel rolls
The electric heater unit of roller include lifting and guiding device (1), column (4), base (5), telescoping crossbeam (6), graphite electrode (9), can
Control silicon heating power supply (12), column (4) is arranged on base (5), column (4) is provided with lifting and guiding device (1), flexible horizontal stroke
One end of beam (6) is arranged on the upper end of column (4), and the other end of telescoping crossbeam (6) installs graphite electrode (9), graphite electrode (9)
Being positioned at the top of roll model (10), graphite electrode (9) is relative with the upper end of roll model (10) vertically downward, and controllable silicon heats
The output cathode (2) of power supply (12) is connected with graphite electrode (9), the output negative pole (11) of controllable silicon heating power supply (12) with roll
Roller former (10) is connected, it is characterised in that it uses following steps to carry out:
A. after cast steel roll casting complete, first insert a round steel at cup and be connected with output negative pole, start controllable silicon and add
Thermoelectric generator；
B. flatcar is shifted onto the position just to roll model, with hand switch, graphite electrode is risen, start front-rear switch and utilize
Graphite electrode is moved to directly over cast steel roll rising head by telescoping crossbeam, starts decline switch, is inserted in rising head by graphite electrode
Molten steel in and observe voltage, electric current tabular value, can see that the arc light at liquid level；
C. adding exothermic mixture in rising head, exothermic mixture to cover completely, and heating added in heating process by the most exposed molten steel in good time
Agent；
Described controllable silicon heating power supply employing following four electrical heating pattern:
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 intensity is 1800A, and voltage strength is 44V；
The second pattern: the time period is for being less than or equal to 1 hour less than or equal to 0.5 hour, more than 0.5 hour, being less than more than 1 hour
Equal to 1.17 hours, more than 1.17 hours less than or equal to 1.5 hours, the controllable silicon heating power supply gear of its correspondence be respectively 6 grades,
6 grades, 6 grades, 7 grades, corresponding current intensity is respectively 2200A, 2200A, 2200A, 2800A, and voltage strength is 44V；
The third pattern: the time period is for being less than or equal to 3 hours less than or equal to 2 hours, more than 2 hours, being less than or equal to more than 3 hours
5 hours, more than 5 hours less than or equal to 5.5 hours, more than 5.5 hours less than or equal to 6 hours, the controllable silicon of its correspondence adds thermoelectricity
Source gear is respectively 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, corresponding current intensity be respectively 2800A, 2200A, 1800A, 1600A,
2800A, voltage strength is 44V；
4th kind of pattern: the time period is for being less than or equal to 2 hours less than or equal to 1 hour, more than 1 hour, being less than or equal to more than 2 hours
3 hours, more than 3 hours less than or equal to 3.5 hours, more than 3.5 hours less than or equal to 4 hours, the controllable silicon of its correspondence adds thermoelectricity
Source gear is respectively 7 grades, 6 grades, 5 grades, 4 grades, 7 grades, corresponding current intensity be respectively 2800A, 2200A, 1800A, 1600A,
2800A, voltage strength is 44V；
Ferrosteel roll is according to different molten steel amounts and the following different electrical heating pattern of rising head diameter employing:
Molten steel amount 10-15 ton, rising head diameter 540-650mm and molten steel amount 15-25 ton, rising head diameter 650-840mm use first
The pattern of kind；Molten steel amount 25-30 ton, rising head diameter 840-910mm use the second pattern；Molten steel amount 30-40 ton, rising head diameter
910-1050mm uses the 4th kind of pattern；
Alloy-steel roll is according to different molten steel amounts and the following different electrical heating pattern of rising head diameter employing:
Molten steel amount 10-20 ton, rising head diameter 540-840mm use the first pattern；Molten steel amount 20-35 ton, rising head diameter 840-
900mm uses the third pattern；Molten steel amount 35-60 ton, rising head diameter 900-1150mm use the third pattern.
The electrical heating method of cast steel roll the most according to claim 1, it is characterised in that: described base (5) and controllable silicon
Heating power supply (12) is arranged on flatcar (13), and track (14), flatcar (13) wheel and track (14) are laid in flatcar (13) bottom
Match.
The electrical heating method of cast steel roll the most according to claim 1, it is characterised in that: described lifting and guiding device (1)
Including 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 respectively with flexible
Crossbeam (6) is connected with ac motor (8), and steel wire rope guide wheel (7) is arranged on column (4) bottom, direction switch and alternating current
Motivation (8) is connected.
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| Application Number | Priority Date | Filing Date | Title |
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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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN104308126A CN104308126A (en) | 2015-01-28 |
| CN104308126B true CN104308126B (en) | 2016-08-31 |
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Families Citing this family (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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| DK1423227T3 (en) * | 2001-07-18 | 2009-11-16 | Netanya Plasmatec Ltd | Reduction of disturbance of ladder wire (ladder wire) and / or improvements in metal quality by gravity casting of designed products by movement of electric arc |
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