CN1023884C - Method and device for pouring hollow ingot by electroslag - Google Patents
Method and device for pouring hollow ingot by electroslag Download PDFInfo
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- CN1023884C CN1023884C CN88106681A CN88106681A CN1023884C CN 1023884 C CN1023884 C CN 1023884C CN 88106681 A CN88106681 A CN 88106681A CN 88106681 A CN88106681 A CN 88106681A CN 1023884 C CN1023884 C CN 1023884C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A method and a device for pouring a hollow ingot by electroslag belong to the technical field of electroslag refining in ferrous metallurgy and are used for producing high-quality hollow ingots. The method comprises pouring heated liquid slag into a cavity formed by internal and external water-cooled crystallizers, heating the liquid slag to a certain temperature by a non-consumable electrode, injecting molten steel melted in a primary smelting furnace into the cavity, and performing thermal feeding by a consumable or non-consumable electrode. The invention designs a combined crystallizer which consists of an inner crystallizer, an outer crystallizer and 1-2 module blocks and is used for electroslag casting of hollow ingots, so that the hollow ingots have good surface quality and fine crystalline tissues, the cost is reduced, and the investment is reduced.
Description
The present invention is a kind of method and device thereof of pouring hollow ingot with electroslags, belongs to the electroslag refining technical field in the ferrous metallurgy, is used to produce high-quality hollow ingot.
The characteristics that the Bohler electroslag tapping method has wash heat, melt cinder protection cast and electroslag refining concurrently and solidifies, but only be used to pour into a mould solid ingot at present.Produce the method that hollow ingot adopts esr and common cast at present, as US3721286, US3683997, GB1175982, the method that is adopted in the GB1388644 patent.But existing esr hollow ingot Technology Need has high-precision liquid level monitoring system and stripping mechanism, and occurs the stuck or too fast bleed-out that causes of pulling rate of plug easily and leak slag, and the spindle quality of common cast is lower.
For this reason, the present invention adopts the Bohler electroslag tapping technology to produce hollow ingot, thereby obtains high quality, hollow ingot cheaply.
In addition, if carry out pouring hollow ingot with electroslags with fixed crystallizer in the past, hollow ingot of then every production will be changed an interior crystallizer, thereby cause very big waste and cost is improved.For this reason, the present invention designs a kind of four plate mold, and this crystallizer is made up of inside and outside water mold and 1～2 wedge, its interior crystallizer is demountable, like this, whenever water outpour a hollow ingot after, interior crystallizer can be taken out, and reuse, thereby reduce cost.
The method of pouring hollow ingot with electroslags of the present invention is:
In changing slag hearth, will consolidate slag and be heated to 1700～1750 ℃; be poured into then in the cavity of inside and outside water mold; in the cavity of inside and outside water mold, use permanent electrode (as graphite; hollow water-cooling metal electrode) heating liquid slag; treat melt cinder be heated to the steel grade fusing point poured into a mould more than 200 ℃ the time; again with first furnace (induction furnace; electric arc furnace; lining electroslag furnace etc. is arranged) the fusing inside and outside water mold of molten steel injection well; also can make blanketing with inert gas this moment; avoid the molten steel secondary pollution; hollow ingot is vulcanized at consumable or permanent electrode and is solidified under contracting then, just obtains required hollow ingot after solidifying.
The present invention adopts ring electrode clamping device vulcanizing with permanent electrode heating liquid slag and with consumable or permanent electrode when contracting, power with the multi-stage series connection mode, thereby can guarantee not produce parasitic electrode.
As when adopting four plate mold of the present invention, treat to take out inside and outside crystallizer after hollow ingot solidifies, so that reuse.Also can adopt fixed interior crystallizer in the past to carry out pouring hollow ingot with electroslags, fixed interior crystallizer welds with relatively more easy steel pipe, and every hollow ingot consumes a steel pipe.
Pouring hollow ingot with electroslags method of the present invention preferably adopts following processing parameter:
1. current density: 0.3～0.9A/mm
2;
2. the voltage before and after the pouring molten steel: the small electrical slag hearth adopts 40～50V.
3. slag system: when adopting AH φ-6 or AH φ-6+8%～10%CaO slag system, feeding effect and slag crust the best, the liquid slag gauge control in the crystallizer cavity is at the little ingot of 80()～the big ingot of 200() mm.
4. vulcanize when contracting and to regulate thyristor operating angle electric current, voltage are descended according to same slope.
Be described below in conjunction with the device-four plate mold of accompanying drawing pouring hollow ingot with electroslags of the present invention:
Fig. 1 is the stereographic map of built-up type interior crystallizer.
Fig. 2 is the general assembly sectional view of the inside and outside crystallizer of four plate mold.
Four plate mold of the present invention is by interior, outer water mold and 1～2 wedge are formed, material is a steel or copper, outer crystallizer is made up of two water-cooled semicircles 7, interior crystallizer is made up of two water-cooled circular arc pieces 6 and 1～2 wedge 3, when adopting a wedge, a side that matches with wedge at each circular arc piece has plural groove 4, the both sides of wedge have respectively with groove 4 makes the corresponding key that cooperates 5, key and groove all tilt at an angle alpha inwards, wedge is assembled into an interior crystallizer with two circular arc pieces by key 5 and cooperating of groove 4, the opposite side of working in coordination at two circular arc pieces has an angle 8, this angle guarantees after wedge is withdrawn from, two circular arc pieces are closed up inwardly, thereby interior crystallizer can easily be taken out from hollow ingot.Angle 8 is preferably 5 °～15 °, and the tapering of wedge is preferably 20～22 °, and the angle [alpha] that key, groove tilt is preferably 55～65 °.When pouring into a mould little hollow ingot, interior crystallizer only gets final product with a wedge, and wedge is without water-cooled; When the big hollow ingot of cast, this moment, interior crystallizer should adopt two wedges, so that take out from hollow ingot easilier, was about to second wedge of two the circular arc piece places of cooperatively interacting installations, and angle 8 no longer exists, and wedge preferably adopts water-cooled.Interior crystallizer water inlet pipe 1 and interior crystallizer rising pipe 2 are arranged on the circular arc piece of interior crystallizer among the figure, be used for water-cooled.
Hollow ingot with 400kg is an example below, and the method for pouring hollow ingot with electroslags and the use of four plate mold are described in detail:
In changing slag hearth, solid slag is heated to 1700～1750 ℃, slag system is generally AH φ-6 or AH φ-6 adds 8%～10%CaO, melt cinder is injected the cavity 10 of the inside and outside water mold of mounted four plate mold, with the permanent electrode heating of the ring electrode clamping device clamping of multi-stage series connection 20～30 minutes, making the melt cinder temperature was more than 200 ℃ of being poured into a mould of steel grade fusing point; 1600 ℃ molten steel of first furnace was injected in 2～3 minutes among the melt cinder, and before and after pouring molten steel, voltage is stabilized in 40～50V, electric current 3500～5000A; After molten steel injects, vulcanize with the consumable of the ring electrode clamping device clamping of multi-stage series connection or permanent electrode and to contract 25～30 minutes, vulcanize the sheepshank bundle in the time of preceding 5～10 minutes electric current reduce to 2500～1500A, reconcile thyristor operating angle electric current, voltage descended according to same slope.
In the present embodiment, feeding effect and slag crust the best when slag system adopts AH Φ-6 or adds AH Φ-6 slag system of 8%～10%CaO, in the crystallizer cavity liquid slag gauge control at 80～100mm, the quantity of slag be ingot heavy about 4～6%.
Behind molten steel solidification, wedge 3 is got downwards or extruded along the keyway vergence direction, wedge 3 falls into the cavity 9 of interior crystallizer, because on the interior crystallizer angle 8 is arranged, under the hollow ingot pressure that solidifies, two circular arc pieces close up inwards, thereby dwindled the diameter of interior crystallizer, thereby at an easy rate it is taken out from the hollow ingot that solidifies, preferably outer crystallizer is taken out, carry out the cast of next hollow ingot with the inside and outside crystallizer that takes out.
Pouring hollow ingot with electroslags of the present invention has the following advantages:
1. because the present invention adopts inside and outside water mold, thereby the crystalline structure of hollow ingot is fine and closely woven: simultaneously, because inside and outside crystallizer relatively moving during not as hot piercing, thereby spindle surfaces externally and internally quality is good, the internal-and external diameter concentricity height of spindle.
2. be starkly lower than esr process owing to the power consumption of Bohler electroslag tapping process, the power consumption of Bohler electroslag tapping only is about 1/3 of electroslag remelting, thereby the hollow ingot cost of producing with the inventive method is low.
3. owing to adopted fourplatemold, interior crystallizer is reusable, thereby has reduced the waste of interior crystallizer, and cost is descended.
4. owing to adopt fourplatemold, thereby need not adopt liquid level monitoring system and stripping structure, thereby reduce equipment investment and simple process is easily gone.
5. the hollow ingot quality of producing with the inventive method is better than common cast ingot, near the hollow ingot of electroslag remelting. 40cr steel pouring hollow ingot with electroslags for example, secondary lath spacing arm average out to 222 μ n, power consumption are 550 degree/ton steel. (hollow ingot external diameter 500mm, internal diameter 160mm).
Claims (5)
1, a kind of four plate mold that is used for pouring hollow ingot with electroslags, it is characterized in that said crystallizer is by interior, outer crystallizer and a wedge are formed, this crystallizer material is a steel or copper, said outer crystallization is that device is made up of two water-cooled semicircles, interior crystallizer is made up of two water-cooled circular arc pieces and a wedge, a side that matches with wedge at each circular arc piece has plural groove, the both sides of wedge have the key that cooperatively interacts with the groove work respectively, key and the groove angle [alpha] that tilts inwards, wedge and two circular arc pieces are by being assembled into an interior crystallizer cooperating of key and groove, the opposite side of working in coordination at two circular arc pieces has an angle, and the angle of angle is 5～15 °.
2, crystallizer as claimed in claim 1, the tapering that it is characterized in that said wedge is 20～22 ℃, the oblique angle α of key and groove is 55～65 °.
3, a kind of four plate mold that is used for pouring hollow ingot with electroslags, it is characterized in that said crystallizer is by interior, outer crystallizer and two wedges are formed, this crystallizer material is a steel or copper, said outer crystallizer is made up of two water-cooled semicircles, interior crystallizer is made up of two water-cooled circular arc pieces and two wedges, all there is a wedge combination section of two circular arc pieces, a side that matches with wedge at each circular arc piece has plural groove, the both sides of wedge have respectively with groove makes the corresponding key that cooperates, key and the groove angle [alpha] that tilts inwards, two wedges and two circular arc pieces are by being assembled into an interior crystallizer cooperating of key and groove.
4, crystallizer as claimed in claim 3 is characterized in that 20～22 ° of the taperings of said wedge, and the oblique angle α of key and groove is 55～65 °.
5,, it is characterized in that said wedge is the water-cooled wedge as claim 3 or 4 described crystallizers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88106681A CN1023884C (en) | 1988-09-21 | 1988-09-21 | Method and device for pouring hollow ingot by electroslag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88106681A CN1023884C (en) | 1988-09-21 | 1988-09-21 | Method and device for pouring hollow ingot by electroslag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041301A CN1041301A (en) | 1990-04-18 |
| CN1023884C true CN1023884C (en) | 1994-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88106681A Expired - Fee Related CN1023884C (en) | 1988-09-21 | 1988-09-21 | Method and device for pouring hollow ingot by electroslag |
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| CN (1) | CN1023884C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041388C (en) * | 1993-06-04 | 1998-12-30 | 储少军 | Internal crystallizer with extensible quadric crank mechanism |
| CN102806323B (en) * | 2012-07-23 | 2014-11-05 | 东北大学 | Equipment for producing aluminum alloy hollow casting ingot and method of equipment |
| CN103962517B (en) * | 2013-02-05 | 2016-03-30 | 宝钢特钢有限公司 | A kind of apparatus for pouring of die casting electrode bar and pouring procedure thereof |
| CN104209481B (en) * | 2014-08-20 | 2016-04-20 | 湖北长煜模具材料有限公司 | Hollow steel ingot casting mold and adopt its cast hollow steel ingot method |
| CN110129577B (en) * | 2019-05-15 | 2021-02-12 | 宁波创润新材料有限公司 | Core crystallizer for casting hollow ingot and water-cooled crystallizer containing core crystallizer |
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1988
- 1988-09-21 CN CN88106681A patent/CN1023884C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1041301A (en) | 1990-04-18 |
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