CN103357838A - Novel electromagnetic centrifugal furnace tube casting process - Google Patents
Novel electromagnetic centrifugal furnace tube casting process Download PDFInfo
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- CN103357838A CN103357838A CN2012100807685A CN201210080768A CN103357838A CN 103357838 A CN103357838 A CN 103357838A CN 2012100807685 A CN2012100807685 A CN 2012100807685A CN 201210080768 A CN201210080768 A CN 201210080768A CN 103357838 A CN103357838 A CN 103357838A
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Abstract
A novel electromagnetic centrifugal furnace tube casting process is characterized by including the steps of A, preheating a metal cylinder (2), and spraying coatings on the inner surface of the same; B, allowing the coatings to form metal liquid (3), starting a magnetic field during metal liquid (3) pouring to form new crystallization nuclei and generate more fined isometric crystals; C, when a furnace tube is cooled and formed, closing a magnetic pole (1) of the magnetic field and moving a magnetic field generator from a slide rail to avoid cylinder damage caused by high-temperature radiation; D, pulling the tube and removing the coatings. Due to the fact that metal elements in the metal liquids are subjected to Lorentz force and motions such as breakage and moving, crystallization manners, crystal types, alloy distribution and the like in the furnace tube are influenced, furnace tube performance is increased, process level of furnace tube manufacturing is increased, billets and labor are saved.
Description
Technical field
Novel electromagnetic centrifugal casting boiler tube technique of the present invention belongs to the centrifugal casting field.
Background technology
The boiler tube of industrial furnace mainly adopts centrifugal casting at present, casting is mainly the water-cooled metal type tube with type tube, the material of type tube is mainly high strength, has the chrome-molybdenum steel of better toughness etc., and molten metal enters by apparatus for pouring in the type tube of High Rotation Speed, cooling, moulding under centrifugal action.In process of production, because the density variation of different-alloy element in the molten metal causes occuring in the cooling procedure serious gross segregation phenomenon under centrifugal action.Simultaneously, because the cooling capacity of chrome-molybdenum steel type tube is limited, cause the crystallization mode of molten metal and kind of crystalline can not reach best perfect condition, affect the performance and used life of boiler tube.
Summary of the invention
The objective of the invention is to propose a kind ofly can overcome defects, eliminate the segregation phenomenon, improve the electromagnetic centrifugal casting process of boiler tube performance.
The present invention is achieved through the following technical solutions goal of the invention:
A kind of novel electromagnetic centrifugal casting boiler tube technique may further comprise the steps:
(A) at first by after the preheating of metal type tube, at the inner surface sprayed coating of described metal type tube;
(B) coating after the spraying forms molten metal, start magnetic field during pouring metal melt, gradually during crystallisation by cooling, molten metal is subject to the Lorentz active force opposite with direction of rotation in steady magnetic field, by the field pole stirring column crystal that generates in the process of setting is smashed, form the new nuclei of crystallization, generate the equiax crystal of more refinements;
(C) after the moulding of boiler tube crystallisation by cooling, close field pole and remove magnetic field generator at slide rail, avoid the radiation damage of type tube high temperature;
(D) tube drawing and remove coating subsequently.
Survey in the field pole described in the present invention and be provided with thermal insulation layer.
Beneficial effect:
The present invention is because the metallic element in the molten metal is subject to Lorentz force at elect magnetic field, fractures, the motion such as migration, affected crystallization mode in the boiler tube, kind of crystalline, alloy distribution etc., thereby improved the boiler tube performance.Reach and improve the technological level that boiler tube is made, less stock, artificial etc.
Description of drawings
Fig. 1 is novel boiler tube electromagnetic centrifugal casting process schematic representation.
Fig. 2 is novel boiler tube electromagnetic centrifugal casting equipment schematic diagram.
Description of reference numerals: 1---field pole; 2---metal type tube; The 3---molten metal; The 4---thermal insulation layer.
The specific embodiment
A kind of novel electromagnetic centrifugal casting boiler tube technique may further comprise the steps:
(A) at first by after 2 preheatings of metal type tube, at the inner surface sprayed coating of described metal type tube 2;
(B) coating after the spraying forms molten metal 3, start magnetic field during molten metal 3 cast, gradually during crystallisation by cooling, molten metal 3 is subject to the Lorentz active force opposite with direction of rotation in steady magnetic field, by field pole 1 stirring the column crystal that generates in the process of setting is smashed, form the new nuclei of crystallization, generate the equiax crystal of more refinements;
(C) after the moulding of boiler tube crystallisation by cooling, close field pole 1 and remove magnetic field generator at slide rail, avoid the radiation damage of type tube high temperature; Simultaneously, the suffered Lorentz active force of alloying element is opposite with direction of rotation, can to a certain degree alleviate the gross segregation phenomenon of alloying element.After the moulding of boiler tube crystallisation by cooling, close magnetic field and remove magnetic field generator at slide rail, avoid the radiation damage of type tube high temperature.Electromagnetic centrifugal casting has changed crystallization mode owing to applied electromagnetic force, has alleviated the gross segregation of alloying element, thus improved cast tube serviceability, improved spun cast pipe manufacturing technology level, reduced production cost.
(D) tube drawing and remove coating subsequently.
Field pole 1 interior survey among the present invention is provided with thermal insulation layer 4.The electromagnetic generator that adds among the present invention is a kind of novel process and the equipment that uses in the common centrifugal casting of industrial furnace compo pipe field, the magnetic field generator that adds adopts the tooling devices such as the slide rail that meets the centrifuge actual condition, frame, the magnetic field generator that adds adopts magnet exciting coil mode arranged side by side, and the unicity magnetic pole that satisfies centrifuge and type tube size is made in the steel plate isolation between the adjacent magnet exciting coil.The electromagnetic centrifugal casting process is the principle that is subject to the Lorentz active force opposite with direction of rotation according to the molten metal in the casting mold in steady magnetic field, by electromagnetic agitation the column crystal that generates in the process of setting is smashed, form the new nuclei of crystallization, generate the equiax crystal of more refinements, improve the performance of boiler tube.By magnetic field generator is installed in the type tube both sides, at the inner horizontal steady magnetic field that forms perpendicular to the type tube axis of type tube, magnetic field intensity is by the electrical current strength control.When molten metal injects, open magnetic field, and keep a period of time, to the molten metal coagulation forming.This technique mainly is comprised of magnetic field generator, centrifugal casting equipment, because the metallic element in the molten metal is subject to Lorentz force at elect magnetic field, fracture, the motion such as migration, affected crystallization mode in the boiler tube, kind of crystalline, alloy distribution etc., thereby improved the boiler tube performance.Reach and improve the technological level that boiler tube is made, less stock, artificial etc.
For achieving the above object, the present invention proposes a kind of novel electromagnetic centrifugal casting boiler tube technique and equipment.According to practical working situation, magnetic field is produced by magnet exciting coil arranged side by side, forms the unicity magnetic pole in the type tube both sides, through the metal type tube, magnetic field intensity can decay, by increasing excitation voltage, intensity by gaussmeter detection type tube internal magnetic field finally forms steady magnetic field.Therefore the present invention proposes making and the installation method of magnetic field generator, realized the normal operation of electromagnetic centrifugal casting.Reached the purpose of improving the boiler tube performance, improving the boiler tube manufacturing technology level, reduce production costs.
Novel electromagnetic centrifugal casting boiler tube technique of the present invention and equipment belong to the centrifugal casting field.The boiler tube of industrial furnace mainly adopts centrifugal casting at present, in process of production, because the density variation of different-alloy element in the molten metal causes occuring in the cooling procedure serious gross segregation phenomenon under centrifugal action.Simultaneously, because the cooling capacity of chrome-molybdenum steel type tube is limited, cause the crystallization mode of molten metal and kind of crystalline can not reach best perfect condition, affect the performance of boiler tube.The objective of the invention is to propose a kind ofly can overcome defects, eliminate the segregation phenomenon, improve electromagnetic centrifugal casting process and the equipment of boiler tube performance.This technique mainly is comprised of magnetic field generator, centrifugal casting equipment, because the metallic element in the molten metal is subject to Lorentz force at elect magnetic field, fracture, the motion such as migration, impel the crystallization mode, kind of crystalline, alloy distribution etc. of molten metal in the boiler tube to be tending towards rationally, evenly, thereby improved the serviceability of boiler tube, prolong the service life of boiler tube, also improved the technological level that boiler tube is made, less stock, less manpower etc.
The below is to making and the operating analysis of Novel furnace pipe electromagnetic centrifugal casting process and equipment:
1 magnetic field generator is made
According to actual needs, the magnetic field that in the space of 1 meter of left and right sides width centered by type tube, needs to produce the 5m*0.3m*1m size.Magnetic field generator adopts magnet exciting coil mode arranged side by side to make the large scale magnetic pole, forms the unicity magnetic pole in the type tube both sides, adds heat insulation cooling layer between magnetic pole and the type tube, and magnetic field intensity is by excitation voltage regulation.
Because the used type tube wall thickness of centrifugal casting is larger, and be in the condition of high temperature during operation.Therefore the making of magnetic field generator has taken into full account the operating mode of centrifuge, adopts the mode that increases excitation voltage to improve magnetic field intensity, and type tube is passed in magnetic field still can reach technological requirement after overdamping.Magnetic field intensity increases with distance between two poles and weakens, and spacing must satisfy the requirement of magnetic field intensity, and can guarantee magnetic pole not to be subjected to the type tube hyperthermia radiation and damage.Therefore, arrange heat insulation and cooling layer at magnetic pole near a side of type tube, this layer can be ignored to the decay of magnetic field intensity.Owing to type tube is longer, can not make the magnet exciting coil of diameter 5m, therefore adopt along the axial mode arranged side by side of type tube and make the unicity magnetic pole.Adopt the steel plate isolation between the adjacent windings, prevent that magnetic field from interfering with each other.
2 electromagnetic centrifugal castings are installed
Magnetic pole adopts frock to be installed in the type tube both sides, and the magnetic pole plane is relative with the type tube axis, and each magnet exciting coil is in isometry position.Whole device is placed on adjustable slide rail, is convenient to the operations such as installation of centrifuge, can cooperate the adjusting magnetic field intensity by changing distance between two poles simultaneously.Magnet exciting coil series connection energising, the device of adjusting excitation voltage etc. is installed away from type tube.Heat insulation and cooling layer is installed together with the magnet exciting coil division board, is convenient to replacing.Measure the horizontal magnetic field that guarantees to form steady with gaussmeter.
3 electromagnetic centrifugal casting process
To the test of comparing of type tube cold junction, adopt different magnetic field intensities, type tube rotating speed, the boiler tube cold junction is carried out Metallographic Analysis, relation between analyzing crystal kind, alloy distribution situation and magnetic field intensity, the type tube rotating speed obtains the technological parameters such as optimum magnetic field intensity, type tube rotating speed, duration.
After the type tube preheating, the inner surface sprayed coating, start magnetic field during the molten steel cast, gradually during crystallisation by cooling, metal liquid is subject to the Lorentz active force opposite with direction of rotation in steady magnetic field, by electromagnetic agitation the column crystal that generates in the process of setting is smashed, formed the new nuclei of crystallization, generate the equiax crystal of more refinements.Simultaneously, the suffered Lorentz active force of alloying element is opposite with direction of rotation, can to a certain degree alleviate the gross segregation phenomenon of alloying element.After the moulding of boiler tube crystallisation by cooling, close magnetic field and remove magnetic field generator at slide rail, avoid the radiation damage of type tube high temperature.Electromagnetic centrifugal casting has changed crystallization mode owing to applied electromagnetic force, has alleviated the gross segregation of alloying element, thus improved cast tube serviceability, improved spun cast pipe manufacturing technology level, reduced production cost.
Claims (2)
1. novel electromagnetic centrifugal casting boiler tube technique is characterized in that: may further comprise the steps:
(A) at first by after metal type tube (2) preheating, at the inner surface sprayed coating of described metal type tube (2);
(B) coating after the spraying forms molten metal (3), start magnetic field during molten metal (3) cast, gradually during crystallisation by cooling, molten metal (3) is subject to the Lorentz active force opposite with direction of rotation in steady magnetic field, by field pole (1) stirring the column crystal that generates in the process of setting is smashed, form the new nuclei of crystallization, generate the equiax crystal of more refinements;
(C) after the moulding of boiler tube crystallisation by cooling, close field pole (1) and remove magnetic field generator at slide rail, avoid the radiation damage of type tube high temperature;
(D) tube drawing and remove coating subsequently.
2. a kind of novel electromagnetic centrifugal casting boiler tube technique as claimed in claim 1 is characterized in that: survey in the described field pole (1) and be provided with thermal insulation layer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100807685A CN103357838A (en) | 2012-03-26 | 2012-03-26 | Novel electromagnetic centrifugal furnace tube casting process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100807685A CN103357838A (en) | 2012-03-26 | 2012-03-26 | Novel electromagnetic centrifugal furnace tube casting process |
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| CN103357838A true CN103357838A (en) | 2013-10-23 |
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| CN2012100807685A Withdrawn CN103357838A (en) | 2012-03-26 | 2012-03-26 | Novel electromagnetic centrifugal furnace tube casting process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106029256A (en) * | 2014-02-25 | 2016-10-12 | 新日铁住金株式会社 | Continuous steel casting method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5736051A (en) * | 1980-08-12 | 1982-02-26 | Kubota Ltd | Centrifugal casting method adding one directional magnetic field |
| US4570698A (en) * | 1983-09-21 | 1986-02-18 | Asea Aktiebolag | Method of and apparatus for centrifugal casting |
| JPH03234341A (en) * | 1990-02-09 | 1991-10-18 | Kubota Corp | Superconducting centrifugal casting machine |
| CN1088496A (en) * | 1992-12-19 | 1994-06-29 | 中国石油化工总公司发展部 | Electromagnetic certrifugal casting technology |
| JP2001096350A (en) * | 1999-09-29 | 2001-04-10 | Kubota Corp | Manufacturing method for composite roll |
| CN101920324A (en) * | 2009-06-15 | 2010-12-22 | 卓然(靖江)设备制造有限公司 | Novel electromagnetic centrifugal casting process and equipment for furnace tube |
-
2012
- 2012-03-26 CN CN2012100807685A patent/CN103357838A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5736051A (en) * | 1980-08-12 | 1982-02-26 | Kubota Ltd | Centrifugal casting method adding one directional magnetic field |
| US4570698A (en) * | 1983-09-21 | 1986-02-18 | Asea Aktiebolag | Method of and apparatus for centrifugal casting |
| JPH03234341A (en) * | 1990-02-09 | 1991-10-18 | Kubota Corp | Superconducting centrifugal casting machine |
| CN1088496A (en) * | 1992-12-19 | 1994-06-29 | 中国石油化工总公司发展部 | Electromagnetic certrifugal casting technology |
| JP2001096350A (en) * | 1999-09-29 | 2001-04-10 | Kubota Corp | Manufacturing method for composite roll |
| CN101920324A (en) * | 2009-06-15 | 2010-12-22 | 卓然(靖江)设备制造有限公司 | Novel electromagnetic centrifugal casting process and equipment for furnace tube |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106029256A (en) * | 2014-02-25 | 2016-10-12 | 新日铁住金株式会社 | Continuous steel casting method |
| CN106029256B (en) * | 2014-02-25 | 2017-10-27 | 新日铁住金株式会社 | The continuous casing of steel |
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Application publication date: 20131023 |