CN109848388A - A kind of device and method based on the direct-fired continuous casting billet constant temperature ejection of electric current - Google Patents
A kind of device and method based on the direct-fired continuous casting billet constant temperature ejection of electric current Download PDFInfo
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- CN109848388A CN109848388A CN201910182934.4A CN201910182934A CN109848388A CN 109848388 A CN109848388 A CN 109848388A CN 201910182934 A CN201910182934 A CN 201910182934A CN 109848388 A CN109848388 A CN 109848388A
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Abstract
The invention discloses a kind of device and methods based on the direct-fired continuous casting billet constant temperature ejection of electric current, the first graphite annulus including being set to flame cutting machine rear-end transmission roller surface, set on the preceding inlet side of continuous casting billet end and form with the first graphite annulus and continuous casting billet second graphite annulus of movable type of closed circuit, which further includes the electrical power control cabinet to second graphite annulus of movable type offer electric current；This method includes continuous casting billet head and the tail temperature after being cut for the first time using infrared radiation thermometer record, and slab is heated by electrical power control cabinet input current value peak value in the end that the second graphite annulus of movable type is moved to continuous casting billet to be heated.Advantages of the present invention is that the apparatus structure is simple, it is easy to operate, the method that constant temperature ejection is carried out using the device simultaneously, slab length direction and radial temperature gradient can fundamentally be reduced, it reduces before rolling due to continuous casting blank temperature is unevenly distributed and is generated thermal stress and promotes structural homogenity, and then improve slab quality after rolling.
Description
Technical field
The invention belongs to continuous-casting art more particularly to a kind of devices based on the direct-fired continuous casting billet constant temperature ejection of electric current
And method.
Background technique
Continuous casting is the major way of steel production, and 90% or more steel is produced using continuous cast method in the world at present.For
The further production efficiency for improving steel products, develops hot delivering technology of CC billets Direct Rolling Technology, which compares tradition side
Method -- continuous casting billet rolls after heating up in heating furnace, has less energy consumption, the advantages such as with short production cycle that hot rolling is become a useful person.In general, hot
Straight technology of rolling is sent to add by the method for longitudinal flux induction heating to the corner parts of continuous casting billet using induction heating
Heat, so that slab can meet rolling demand without heating furnace.However existing induction heating method at most realizes slab diameter
Reduction to temperature gradient is not able to achieve being uniformly distributed for temperature on length direction.In addition, induction heating is by electricity of inducting in slab
The Joule heat of stream is realized, therefore capacity usage ratio is to be improved.
Currently, to reduce the temperature gradient of continuous casting billet entirety, industrially frequently with the process for improving pulling rate.However,
The optimization of technique can not be inherently eliminated this problem of temperature distributing disproportionation on the radial especially length direction of continuous casting billet, this returns
Censure in the operational characteristic of continuous casting technology: the continuous casting billet front end exposure aerial time is long compared with rear end, thus after intensity of cooling ratio
End is big, and the aerial different durations of exposure determine certainly will there is temperature difference on continuous casting billet length direction；Crystallizer and two cold
Continuous casting billet in area all radiates from surface, therefore continuous casting billet cooling procedure in the radial direction will also result in temperature difference.
Summary of the invention
Goal of the invention: the first object of the present invention, which is to provide one kind, can be inherently eliminated continuous casting billet radial direction and length side
Upward temperature difference, and then realize the device of continuous casting billet constant temperature ejection；
The second object of the present invention is to provide the method for carrying out constant temperature ejection using above-mentioned apparatus.
Technical solution: the present invention is based on the devices of the direct-fired continuous casting billet constant temperature ejection of electric current, including cut set on flame
First graphite annulus of cutting mill rear-end transmission roller surface, set on the preceding inlet side of continuous casting billet end and with the first graphite annulus and continuous casting billet
The second graphite annulus of movable type of closed circuit is formed, which further includes providing the power supply of electric current to second graphite annulus of movable type
Control cabinet.
Furtherly, the device further include slab head and the tail temperature after being cut for the first time to flame cutting machine be acquired it is red
Outer temperature measurer, and the microsystem of electrical power control cabinet is fed back and regulated and controled to infrared radiation thermometer temperature.
The method that the present invention carries out the ejection of continuous casting billet constant temperature using above-mentioned apparatus includes the following steps: using infrared measurement of temperature
Continuous casting billet head and the tail temperature T after instrument record is cut for the first time1And T2, the second graphite annulus of movable type is moved to continuous casting billet to be heated
End passes through electrical power control cabinet input current value peak Ip, slab is heated, wherein IpMeet following formula:
In above-mentioned formula, TpFor electric current pulsewidth；ImFor Equivalent DC electricity；T` is current cycle；V is drawing speed m/s；L is
Coil length m；C is the specific heat capacity J/ (KgK) of steel；σ is the conductivity of steel；ρ is the density Kg/m of steel3；S is slab cross section
Product m2；T1、T2For slab head and end surface temperature DEG C.
Furtherly, the electric current that the present invention is passed through is I (t)=IpSin (2 π ft), wherein f is power frequency.Electric current frequency
Rate f is 50~2500Hz.
The utility model has the advantages that compared with prior art, remarkable advantage of the invention are as follows: the apparatus structure is simple, easy to operate, together
The method that the Shi Caiyong device carries out constant temperature ejection can fundamentally reduce slab length direction and radial temperature gradient,
It reduces before rolling due to continuous casting blank temperature is unevenly distributed and is generated thermal stress and promotes structural homogenity, and then after improving rolling
Slab quality.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of apparatus of the present invention；
Fig. 2 is the schematic diagram of electric current of the present invention heating.
Specific embodiment
Further details of the technical solution of the present invention with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, the present invention is based on the devices of the direct-fired continuous casting billet constant temperature ejection of electric current, including are set to
First graphite annulus 3 on 1 rear-end transmission roller of flame cutting machine, 2 surface, set on the preceding inlet side of continuous casting billet end and with the first graphite annulus
3 and continuous casting billet form second graphite annulus of movable type 4 of closed circuit, slab after cut for the first time to flame cutting machine 1 is warm from beginning to end
The infrared radiation thermometer being acquired is spent, provides the electrical power control cabinet 5 of electric current to mobile second graphite annulus 4, and to infrared survey
Warm instrument temperature is fed back and regulates and controls the microsystem of electrical power control cabinet 5.Wherein, the second graphite annulus 4 and continuous casting billet cross sectional shape
It is consistent, it can be square coil, square coil and circular coil, and then be in contact with continuous casting billet.
And mobile second graphite annulus is realized and moves and can pass through cunning by the top of casting apparatus again setting sliding rail 6
Bar 7 connects the second graphite annulus, and then realizes move left and right on the slide rail.
The method for carrying out the ejection of continuous casting billet constant temperature using above-mentioned apparatus includes the following steps: to record using infrared radiation thermometer
Continuous casting billet head and the tail temperature T after cutting for the first time1And T2, it is (i.e. next that the second graphite annulus 4 of movable type is moved to continuous casting billet to be heated
Slab) end, pass through 5 input current value peak I of electrical power control cabinetp, slab is heated, wherein IpMeet following public
Formula:
In above-mentioned formula, TpFor electric current pulsewidth；ImFor Equivalent DC electricity；T` is current cycle；V is drawing speed m/s；L is
Coil length m；C is the specific heat capacity J/ (KgK) of steel；σ is the conductivity of steel；ρ is the density Kg/m of steel3；S is slab cross section
Product m2；T1、T2For slab head and end surface temperature DEG C.Work as TpWhen=T`, i.e. alternating current, TpWhen < T`, i.e. pulse current, i.e.,
The current forms multiplicity being passed through in second graphite annulus 4, can select alternating current or pulse current according to the actual situation.
Alternating current or pulse current are imported by the second graphite annulus 4 on the continuous casting billet section of 1 rear end of flame cutting machine, it should
Second graphite annulus 4 and first graphite annulus 3 on 2 surface of live-roller form closed circuit together with slab, and electric current generates in continuous casting billet
Joule heat, and then directly heat slab.During the function of current, the current expression being passed through is I (t)=IpSin (2 π ft), frequency
The skin depth of rate f influence electric currentThat is major heated zones domain.For the thermal efficiency for improving induction heating, slab is equivalent
Diameter and skin depth meetThe power frequency thereby determined that is usually 50~2500Hz.(as D > 150mm,
F usually selects 50Hz, as D < 150mm, referenceValue).Wherein Ip, f, μ, σ, t respectively represent current peak, power frequency, magnetic
Conductance, conductivity and flame cutting machine cut after time, D represents diameter for round billet, and square billet represents side length, and slab represents thickness
Degree.
When one timing of frequency, with the progress of throwing, slab volume is continuously increased in circuit, since slab front end enters electricity
Time in road is compared with end morning, thus front end heating time is long；In addition, alternating current or pulse current have skin effect, that is, slab
Surface layer electric current is greater than central current, and exponentially type decays, so that electric current is greater than inside to the heating intensity of casting billet surface.On
Stating heating effect, this operational characteristic is mutually tied with continuous casting billet itself " slab head temperature is low compared with rear end, and surface temperature is relatively internal low "
It closes, finally makes slab horizontal direction and radial temperature profile uniform.
Embodiment 1
No. 45 steel round blank continuous castings diameter 150mm, pulling rate 800mm/min, the long 1200mm of the slab that cutting machine is cut.
According to data, No. 45 steelρ=7500Kg/m3, c=450J/ (KgK).
According to above-mentioned condition, load coil uses square coil, internal coil diameter 170mm.When load coil is long
50mm.Assuming that temperature of the infrared radiation thermometer measurement continuous casting billet end to end at two is respectively T1=900 DEG C, T2=1000 DEG C.
According to the electric current frequency f=50Hz due to square billet diameter 150mm, being passed through in load coil.
Assuming that temperature of the infrared radiation thermometer measurement continuous casting billet end to end at two is respectively T1=900 DEG C, T2=1000 DEG C.
Above-mentioned parameter input current is controlled in program, program is passed throughConversion, obtains Im=
1.8×105A, if using alternating current Ip=2.5 × 105A.If using pulse current, as duty ratio n=0.3, i.e.,
Ip=4.6 × 105A。
Specific method includes: firstly, fixed the first graphite annulus 3 and the second graphite annulus 4 for being connected with cooling device；Secondly, logical
Enter recirculated water, continuous casting billet head and the tail temperature T after cutting for the first time using infrared radiation thermometer record1And T2, by mobile second graphite annulus 4
It is moved to the end of continuous casting billet to be heated, 5 input current value peak I of electrical power control cabinet is regulated and controled by microsystemp, to slab
It is heated.
Embodiment 2
316L stainless steel billet continuous casting side length 150mm, pulling rate 400mm/min, the long 1200mm of the slab that cutting machine is cut.
According to data,ρ=7583Kg/m3, c=655J/ (KgK).
According to the electric current frequency f=50Hz due to square billet side length 150mm, being passed through in load coil.
Assuming that temperature of the infrared radiation thermometer measurement continuous casting billet end to end at two is respectively T1=900 DEG C, T2=1100 DEG C.
Above-mentioned parameter input current is controlled in program, program is passed throughConversion, obtains Im=
1.5×105If using alternating current Ip=2.1 × 105A.If using pulse current, as duty ratio n=0.15, i.e.,Ip=5.5 × 105A。
Embodiment 3
Certain bearing steel sheet billet continuous casting long 135mm, wide 100mm, pulling rate 1200mm/min, the slab that cutting machine is cut are long
1200mm。
According to data, σ ≈ 7.14 × 105S/m, ρ=7200Kg/m3, c=533J/ (KgK).
According to due to slab thickness D=100mm, according toTherefore the electric current being passed through in load coil
Frequency range f=86~190Hz, selects 100Hz here.
Assuming that temperature of the infrared radiation thermometer measurement continuous casting billet end to end at two is respectively T1=900 DEG C, T2=1100 DEG C.
Above-mentioned parameter input current is controlled in program, program is passed throughConversion, obtains Im=
4.0×104If using alternating current Ip=5.7 × 104A.If using pulse current, as duty ratio n=0.25, i.e.,Ip=1.1 × 105A。
Claims (5)
1. a kind of device based on the direct-fired continuous casting billet constant temperature ejection of electric current, it is characterised in that: including being set to gas flame cuttiug
First graphite annulus (3) on machine (1) rear-end transmission roller (2) surface, set on the preceding inlet side of continuous casting billet end and with the first graphite annulus
(1) and continuous casting billet formed closed circuit the second graphite annulus of movable type (4), which further includes to second graphite annulus of movable type
(4) electrical power control cabinet (5) of electric current is provided.
2. the device according to claim 1 based on the direct-fired continuous casting billet constant temperature ejection of electric current, it is characterised in that: the dress
Setting further includes infrared radiation thermometer that the slab head and the tail temperature after cutting for the first time to flame cutting machine (1) is acquired, and to red
Outer temperature measurer temperature is fed back and regulates and controls the microsystem of electrical power control cabinet (5).
3. the method for carrying out the ejection of continuous casting billet constant temperature using device described in claim 1, it is characterised in that include the following steps:
Continuous casting billet head and the tail temperature T after being cut for the first time using infrared radiation thermometer record1And T2, by mobile second graphite annulus (4) be moved to
The end of the continuous casting billet of heating passes through electrical power control cabinet (5) input current value peak Ip, slab is heated, wherein IpIt is full
The following formula of foot:
In above-mentioned formula, TpFor electric current pulsewidth；ImFor Equivalent DC electricity；T` is current cycle；V is drawing speed m/s；L is coil
Length m；C is the specific heat capacity J/ (KgK) of steel；σ is the conductivity of steel；ρ is the density Kg/m of steel3；S is slab cross-sectional area m2；
T1、T2For slab head and end surface temperature DEG C.
4. the method for carrying out continuous casting billet constant temperature ejection using device according to claim 3, it is characterised in that: described to be passed through
Electric current is I (t)=IpSin (2 π ft), wherein f is power frequency.
5. the method for carrying out the ejection of continuous casting billet constant temperature using device according to claim 4, it is characterised in that: the electric current frequency
Rate f is 50~2500Hz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910182934.4A CN109848388B (en) | 2019-03-12 | 2019-03-12 | Continuous casting billet constant-temperature knockout device and method based on current direct heating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910182934.4A CN109848388B (en) | 2019-03-12 | 2019-03-12 | Continuous casting billet constant-temperature knockout device and method based on current direct heating |
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| Publication Number | Publication Date |
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| CN109848388A true CN109848388A (en) | 2019-06-07 |
| CN109848388B CN109848388B (en) | 2020-10-30 |
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| GB1279138A (en) * | 1968-06-11 | 1972-06-28 | Continental Ore Corp | Improvements in or relating to methods and apparatus for direct reduction of metallic materials |
| GB1495670A (en) * | 1974-07-29 | 1977-12-21 | Baxter Travenol Lab | Electrical method and apparatus for testing membranous articles |
| US5156800A (en) * | 1990-01-03 | 1992-10-20 | Stein-Heurtey | Installation for the thermal/treatment before rolling of thin slabs produced by continuous-casting |
| CN1310648A (en) * | 1998-06-10 | 2001-08-29 | 赫林多洼股份有限公司(全俄冶金与机械制造科研设计一体化的研究院的下属公司) | Method for producing a hoop in a combined casting and rolling apparatus and device for realising the same |
| CN204294619U (en) * | 2014-11-21 | 2015-04-29 | 清华大学深圳研究生院 | The efficient Electroplastic rolling system of titanium alloy strip |
| CN207479193U (en) * | 2017-11-03 | 2018-06-12 | 南京净环热冶金工程有限公司 | A kind of constructional device of continuous casting blank temperature the Uniform Control |
| CN108723087A (en) * | 2018-05-07 | 2018-11-02 | 哈尔滨工业大学 | A kind of multi-layer metal composite plate pulse current auxiliary milling method and device |
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2019
- 2019-03-12 CN CN201910182934.4A patent/CN109848388B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1279138A (en) * | 1968-06-11 | 1972-06-28 | Continental Ore Corp | Improvements in or relating to methods and apparatus for direct reduction of metallic materials |
| US3606778A (en) * | 1968-06-17 | 1971-09-21 | Reactive Metals Inc | Method and apparatus for warm-rolling metal strip |
| GB1495670A (en) * | 1974-07-29 | 1977-12-21 | Baxter Travenol Lab | Electrical method and apparatus for testing membranous articles |
| US5156800A (en) * | 1990-01-03 | 1992-10-20 | Stein-Heurtey | Installation for the thermal/treatment before rolling of thin slabs produced by continuous-casting |
| CN1310648A (en) * | 1998-06-10 | 2001-08-29 | 赫林多洼股份有限公司(全俄冶金与机械制造科研设计一体化的研究院的下属公司) | Method for producing a hoop in a combined casting and rolling apparatus and device for realising the same |
| CN204294619U (en) * | 2014-11-21 | 2015-04-29 | 清华大学深圳研究生院 | The efficient Electroplastic rolling system of titanium alloy strip |
| CN207479193U (en) * | 2017-11-03 | 2018-06-12 | 南京净环热冶金工程有限公司 | A kind of constructional device of continuous casting blank temperature the Uniform Control |
| CN108723087A (en) * | 2018-05-07 | 2018-11-02 | 哈尔滨工业大学 | A kind of multi-layer metal composite plate pulse current auxiliary milling method and device |
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