CN203599494U - Device special for performing perpendicular continuous casting on hollow cast tubes - Google Patents
Device special for performing perpendicular continuous casting on hollow cast tubes Download PDFInfo
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- CN203599494U CN203599494U CN201320837519.6U CN201320837519U CN203599494U CN 203599494 U CN203599494 U CN 203599494U CN 201320837519 U CN201320837519 U CN 201320837519U CN 203599494 U CN203599494 U CN 203599494U
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- field generator
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- water collar
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 166
- 229910052742 iron Inorganic materials 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 36
- 229910002804 graphite Inorganic materials 0.000 claims description 33
- 239000010439 graphite Substances 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 230000009970 fire resistant effect Effects 0.000 claims description 4
- 229910052863 mullite Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 5
- 230000008520 organization Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 229910001018 Cast iron Inorganic materials 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 230000005284 excitation Effects 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 244000309464 bull Species 0.000 description 4
- 210000001787 dendrite Anatomy 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009750 centrifugal casting Methods 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 241001631457 Cannula Species 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The utility model provides a device special for performing perpendicular continuous casting on hollow cast tubes. An L-shaped continuous casting holding furnace, a rotary magnetic field generator and a crystallizer are connected in series to form a U-shaped channel allowing molten iron to flow in, and by means of the rotary magnetic field generator, molten iron can rotate in the crystallizer to enable the appearance of the produced hollow cast tubes to be neat and regular. The wall surface of the inner hole has no tension band and is smooth, internal organization is dense and fine, dimensional accuracy is greatly improved, interference with radial growth of primary dendritic crystals is achieved, the proportion of isometric crystal zones is increased, and mechanical performance of the hollow cast tubes is improved. Therefore, the device special for performing perpendicular continuous casting on hollow cast tubes is high in practical value.
Description
Technical field
The utility model relates to the special equipment of the hollow cast tube of a kind of vertical continuous casting.
Background technology
Up to now, the relevant patented technology that draws the hollow cast tube of cast iron is open, and its technical characterictic divides two classes: the first kind is horizontal casting scheme: the one, and horizontal casting method is produced device and the production technology thereof of cast iron pipe, publication number: CN1410188; The 2nd, hollow cast iron section bar and horizontal continuous casting apparatus, publication number: CN2589125; The 3rd, a kind of continuous casting production device of hollow cast iron section bar, publication number: CN102228963A.The common trait of technique scheme is on the basis of horizontal casting, in the middle of original jacket-type crystallizer, increase an inner core crystallizer, inner core crystallizer is made up of water-cooled core and graphite cannula, two crystallizers are installed with one heart, form an annular spaces, molten iron in holding furnace enters after this annular spaces continuously, is constantly condensed into ring-type shell, is more continuously pulled out.The potential risk of this type of scheme is, when molten iron is after on inner core crystallizer, condensation goes out shell, just produce huge convergent force, wale tightly graphite cannula, when shell is during by drawing, graphite cannula can be pulled off, and therefore, this type of scheme does not in theory especially have reasonability and possibility in practice.Equations of The Second Kind is vertical continuous casting scheme, disclosed patent is mainly with KR9001324(Continous Casting Line of a Cast Iron Tube, Priority number:FR1984001808419841126.) and US4236571(Process and Installation for the Continuous Casting of Tubular.) be representative, the essential characteristic one of this type of technical scheme is vertical drawing, the 2nd, adopt hot core crystallizer.For the graphite that prevents cold core crystallizer is pulled off, this class technical scheme adopts hot core crystallizer, with built-in sensitive circle heating graphite core, or allow molten iron enter the inside of graphite core, when molten iron enters after the annulus between overcoat crystallizer and hot core, only rely on the condensation of overcoat crystallizer to go out tubing, and can not wale hot core graphite cannula, there is significant deficiency in this type of technical scheme, reason is: 1, since the hot core in patent KR9001324 is surrounded by molten iron, its operating temperature is the temperature of molten iron namely, concerning plain cast iron, this temperature must be 1300 ℃ of left and right, patent US4236571 uses induction coil heating graphite core, and temperature must be higher, and we know, in the molten iron of graphite more than 1250 ℃, can, by etch rapidly, cannot continue more than 10 minutes, if 2 adopt the material (as Sialon material beta-sialon, α-sialon) that can resist molten iron etch, will rub with solidifying pipe material inner wall again, cause being pulled off.In practice, molten iron temperature fluctuation to some extent, cannot guarantee that tubing process of setting can finish just in the terminal of annulus, if finished early, solidifying tubing will be waled hot core, if end is more late, molten iron will leak; 3, in jacket-type crystallizer, place inner core again, place induction coil in inner core again, the pipe internal diameter size that must enable to draw is restricted, in fact, the tubing that this scheme can draw, internal diameter can not be less than 150mm.
The applicant applies for a patent before this (CN100479948C and CN201371225Y) and discloses a kind of new technical scheme---draw centreless continuous casting on vertical.By jacket-type crystallizer at right angle setting, utilize the condensation process time difference that ecto-entad carries out in crystallizer, and the feature progressively thickening from bottom to top, in the time that going out certain thickness tubing, condensation just it is upwards pulled out length by length.The other end of holding furnace pours into molten iron constantly, is full of all the time with the molten iron maintaining in crystallizer, and liquid level remains near the height of upper flange plate, and the condensation process of ecto-entad is carried out incessantly.There is following defect in this class scheme: the one, and the molten iron temperature in crystallizer from bottom to top reduces gradually, and on the end face of topmost, temperature is minimum, molten iron flow variation, the tube core inner wall coarse injustice forming; The 2nd, due to casting process be " drawing-pause-drawing-pause-... " hocket, and the dead time is greater than several times of drawing times and even tens times, when pause, molten iron level is relatively static in tube core, and radial solidification speed is very large, therefore at this height and position, tube wall thickness obviously thickens, and causes the annular boss (or title " cranse ") that has Bamboo-shaped on pipe material inner wall in macroscopic view.The stack of above-mentioned two defects, declines the endoporus dimensional accuracy of the hollow cast tube of continuous casting greatly, and through actual verification, on the continuous casting tubing of external diameter 100-200mm, wall thickness 10-20mm, cranse height 3-8mm, makes internal diameter size error up to 6-16mm; And on continuous casting tubing more than external diameter 200mm, more than wall thickness 20mm, cranse height 5-10mm, makes internal diameter size error at 10-20mm, so serious scale error, obviously declines the market using value of the hollow cast tube of continuous casting.The 3rd, because the cooling velocity of water mold is very high (under same size of pipe and tubing prerequisite, its cooling rate is on average 4-5 times of centrifugal casting, it is approximately 30 times that sand is cast), cause the radial symmetry gradient in the interior molten iron fluid column of crystallizer very large, thereby make a dendrite very flourishing, almost can run through whole tube wall, what accompany with it is, crystal boundary in cast sturcture and graphite flake are also parallel to radially mostly, and this distribution reduces the tangential intensity of hollow cast tube greatly; The 4th, in the molten iron fluid column in crystallizer, there is no strong convection current, solute Distribution gradient is larger, causes tube wall ectonexine component difference larger, tissue and performance uniformity variation.The existence of above four defects shows, although use vertical continuous casting method can draw out the hollow cast tube of cast iron, from tubing profile, the scale error of its endoporus is too large, reaches far away the technical merit of " near-net-shape "; From microstructure, a nascent dendrite is too flourishing, and very little, the tangential intensity of material is lower for the ratio of equiaxed grain structure; From composition and performance, tube wall ectonexine is inconsistent.Above-mentioned defect, becomes the bottleneck that vertical continuous casting method develops, and is therefore necessary to improve.
Summary of the invention
The technical problem that the present invention solves: the special equipment that the hollow cast tube of a kind of vertical continuous casting is provided, L-type continuous casting holding furnace, rotating magnetic field generator and crystallizer are connected in series, form a U-shaped passage for molten iron flow, molten iron continuously injects from U-shaped passage one end, flow through the refractory tube of rotating magnetic field generator inside, enter and in the graphite cannula of crystallizer, start ecto-entad and solidify, the steel pipe finally drawing by mechanical traction roller vertically upward drawing goes out hollow cast iron section bar.
The technical solution used in the present invention: the special equipment that the hollow cast tube of a kind of vertical continuous casting is provided, there is crystallizer, rotating magnetic field generator and L-type continuous casting holding furnace, described L-type continuous casting holding furnace left end is placed in molten iron pouring ladle lower end, described rotating magnetic field generator is fixed on L-type continuous casting holding furnace right-hand member upper surface, described crystallizer is fixed on rotating magnetic field generator upper surface, jointly forms the U-shaped passage for molten iron circulation with L-type continuous casting holding furnace left end.
Wherein, described crystallizer comprises graphite cannula and steel water collar, described graphite cannula is pressed in steel water collar, and described graphite cannula and steel water collar upper surface are provided with crystallizer upper flange, and steel water collar lower surface is provided with crystallizer lower flange and crystallizer lower flange is stretched out in graphite cannula lower end, described rotating magnetic field generator comprises water collar, refractory tube and magnet exciting coil, described water collar inserts in magnet exciting coil endoporus, described refractory tube inserts in water collar endoporus and between the two to be filled in and establishes fire-resistant cotton, described water collar and magnet exciting coil upper surface are provided with magnetic field generator upper flange, and water collar and magnet exciting coil lower surface are provided with magnetic field generator lower flange and magnetic field generator lower flange is stretched out in refractory tube lower end, described L-type continuous casting holding furnace comprises L-type pedestal, on described L-type pedestal, be shaped with passage, described graphite cannula lower end is communicated with refractory tube upper port through magnetic field generator upper flange, described refractory tube lower end is communicated with the U-shaped passage forming for molten iron circulation with channel end mouth, connecting bolt is through crystallizer lower flange, magnetic field generator upper flange and magnetic field generator lower flange, crystallizer and rotating magnetic field generator are connected as one, described magnetic field generator lower flange is connected to one by stainless steel connecting plate and L-type pedestal right-hand member, described L-type pedestal right-hand member sidepiece is shaped with to be let out iron hole and uses stopper jam-pack.
Further, described water collar is made by polytetrafluoroethylene (PTFE) material; Described refractory tube is made by corundum-mullite material.
Further, described water collar is screw type water collar, comprise that band spiral fluted body and cylindrical outer wall and both interference fits are integrated, described cylindrical outer wall is from being inserted in the spiral channel that forms sealing with spiral fluted body one end, and the upper and lower of described cylindrical outer wall is all shaped with screw.
Further, on the upper and lower two terminal circle perisporium of described magnet exciting coil, be all shaped with through hole, the water inlet pipe of described water collar and outlet pipe insert and are tightened in the screw of cylindrical outer wall excircle from through hole.
The present invention is compared with prior art connected in series L-type continuous casting holding furnace, rotating magnetic field generator and crystallizer, form the U-shaped passage for molten iron flow, and utilize rotating magnetic field generator that molten iron is rotated in crystallizer, the hollow cast iron tubing neat appearance of producing, on endoporus wall, there is no cranse, level and smooth and the inherence of wall is organized fine and closely woven, dimensional accuracy improves greatly, disturb again the radial growth of a dendrite, increase the ratio in equiax crystal district, improve the mechanical performance of hollow cast tube, there is very high practical value.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is rotating magnetic field generator structural representation of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing 1,2, a kind of embodiment of the present invention is described.
The vertical continuous casting method of hollow cast iron tubing, the U-shaped passage 5 that adopts L-type continuous casting holding furnace 3 and rotating magnetic field generator 2 and the common formation of crystallizer 1 to circulate for molten iron 6, molten iron 6 in molten iron pouring ladle 4 injects continuously from the U-shaped passage 5 left end porch of L-type continuous casting holding furnace 3, the rotating magnetic field generator 2 of flowing through enters crystallizer 1 again, the rotating excitation field that rotating magnetic field generator 2 produces is ordered about molten iron 6 High Rotation Speeds that magnetic field surrounds, drive the molten iron 6 in crystallizer 1 to rotate, the condensation from outside to inside in crystallizer 1 of the molten iron 6 of High Rotation Speed, then the steel pipe 8 drawing by mechanical traction roller 7 draws vertically upward transfers to hollow cast iron tubing.
Concrete steps are as follows:
Preparation: graphite cannula 9 is pressed in steel water collar 10 to composition crystallizer 1; Graphite cannula 9, than the long 30mm of steel water collar 10 left and right, stretches out from the dish hole of crystallizer lower flange 12, and prefabricated refractory tube 14 is injected in polytetrafluoroethylene (PTFE) water collar 13, uses fire-resistant cotton 22 jam-packs between the two; Refractory tube 14 upper surfaces are lower than magnet exciting coil 15 and the shared about 30mm of magnetic field generator upper flange 16 left and right of polytetrafluoroethylene (PTFE) water collar 13, suitable with the length of graphite cannula 9 external parts; Refractory tube 14 lower surfaces grow about 50-60mm left and right than magnetic field generator lower flange 17 end faces, also form an external part.Between end face, be coated with resistant to elevated temperatures zirconium English powder mud docking of graphite cannula 9 external parts and refractory tube 14, be inverted crystallizer 1, rotating magnetic field generator 2 is enclosed within on graphite cannula 9 external parts, again magnetic field generator lower flange 17 is enclosed within on refractory tube 14, finally with four stainless steel connecting bolts 20, crystallizer lower flange 12 is connected to compression with magnetic field generator upper flange 16, magnetic field generator lower flange 17, forms an entirety.Simultaneously in the right-hand member plane of L-type continuous casting holding furnace 3 (on a low transverse plane), take the circular hole on the stainless steel connecting plate 21 connecting with L-type pedestal 18 in advance as external diameter, repair stepped hole downwards, its center is exactly the outlet of the passage 19 on L-type continuous casting holding furnace 3, step hole depth 50-60mm; Seat clay mud is twisted into strip, and dish is at stepped hole bottom end face; Sling crystallizer 1 and rotating magnetic field generator 3, insert stepped hole the external part of refractory tube 14, and magnetic field generator lower flange 17 is fastened on stainless steel connecting plate 21; Remove U-shaped passage 5 internal causes and compress the unnecessary fire clay operating and extrude; Fall into the foreign material in U-shaped passage 5 from letting out 23 cleanings of iron hole, solid with stopper 24 shutoff; Install the inlet and outlet pipe lines of crystallizer 1 and rotating magnetic field generator, connect the electric wire of rotating magnetic field generator 3 and electric current regulator cubicle, after above-mentioned preparation completes, this special equipment just can formally come into operation:
1) the U-shaped passage 5 of flame preheating, makes its lower surface temperature be greater than 800 ℃;
2) clamp external diameter and be slightly smaller than steel pipe 8 upper ends of graphite cannula 9 internal diameters with being positioned at mechanical traction roller 7 directly over crystallizer 1, and graphite cannulas 9 are inserted in steel pipe 8 lower ends arrive crystallizer 1 medium position; On described steel pipe 8 bottom diameter walls, be shaped with helicla flute, so that molten iron 6 freezes after immersing, become one with steel pipe 8;
3) melt and configure the molten iron that composition is suitable, coming out of the stove in 1500 ℃ of left and right, pours bull ladle into, carries out inoculation, then pour in molten iron pouring ladle 4, and hydraulic cylinder 25 work are tilted molten iron pouring ladle 4, and molten iron 6 is injected in U-shaped passage 5 gradually; Specifically, before the molten iron 6 in molten iron pouring ladle 4 closes on and is finished down, pour into again next iron clad water by bull ladle to it, watering fashionable hydraulic cylinder 25 push rods falls after rise, but still must be to U-shaped passage 5 arrival end pouring molten iron 6, guarantee that the molten iron level height in U-shaped passage 5 is constant, bull ladle is to 1/2 of effective acting time that is less than inovulant used and nodulizer interval time of molten iron pouring ladle 4 pouring molten iron 6;
4) in the time of a little higher than crystallizer 1 medium position of the molten iron level height in U-shaped passage 5 submergence steel pipe 8 lower end helicla flute, stop cast, the hollow cast tube diameter drawing according to need is determined the dead time, and the time of pause rule of thumb can be determined as follows: determine according to the caliber that will draw (Φ) size the time t pausing
0, (when Φ ≈ 100mm, t
0≈ 10 seconds; When Φ ≈ 200mm, t
0≈ 15 seconds; When Φ ≈ 300mm, t
0≈ 20 seconds, by that analogy), now molten iron 6 certainly starts to solidify outside to inside in crystallizer 1, the precooling dead time finishes the mechanical carry-over pinch rolls 7 of rear startup and starts drawing, drawing step pitch initial alignment 40mm, and after drawing starts, the molten iron pouring ladle 4 of being controlled by hydraulic cylinder 25 continues to the interior pouring molten iron of U-shaped passage 5, make the interior liquid level of crystallizer 1 remain the above height of portion therein, by bull ladle batch (-type) to the interior supplementary molten iron 6 of molten iron pouring ladle 4, the intermittent time is less than the molten steel preparation half of effective time;
5) when drawing goes out after the hollow cast tube of 1-2 rice, start rotating magnetic field generator 2, the molten iron 6 in crystallizer 1 is rotated.The hollow cast tube of 1-2 rice that initial stage draws contains the defects such as impurity, cold shut and pore, can not use, and follow-up hollow cast tube does not have defect, becomes high fine and close hollow cast tube;
6) steel pipe 8 of using when seeding rises, and its lower end cuts off hollow cast tube while exceeding the shut-off mechanism of mechanical traction roller 7 and top thereof; When the lower end of steel pipe 8 rises to after the height and position of mechanical traction roller 7, newly-generated hollow cast tube itself just replaces steel pipe 8, becomes the guide rod of drawing, the Duan Qu mechanism of mechanical traction roller 7 tops, by desired length, hollow cast tube is cut off, and unload to get and be placed into ground location;
7) in drawing process, according to pipe thickness and the internal face finish of the hollow cast tube of observing after disconnected getting, adjust at any time the intensity of drawing parameter and rotating excitation field, to obtain desired pipe thickness and most measured finish.Pipe thickness is adjusted by drawing parameter, and drawing parameter comprises: " account for stop than " (being the drawing time and the ratio of dead time), adjustable range 1.2～0.1; Drawing step pitch, adjustable range 30～50mm; Molten iron tapping temperature, 1520～1450 ℃ of adjustable ranges (magnesium iron), 1460～1400 ℃ (gray iron); Crystallizer inflow size, take leaving water temperature as reference, 40 ℃～70 ℃ of adjustable ranges. if thickening tube wall, can take respectively to reduce account for stop than, reduce drawing step pitch, reduce molten iron tapping temperature, strengthen the measures such as crystallizer inflow, also above-mentioned four kinds of measures can be combined to employing.If attenuate tube wall is just taked measure contrary to the above.Finish regulates by the size of rotating excitation field intensity, in the scope of 250Gs-500Gs, changes.According to cast tube internal diameter size, rotating excitation field can produce the V font liquid level of differing heights, and washing away liquid/liquid/solid interface in various degree.Guaranteeing to eliminate under the prerequisite of Bamboo-shaped cranse and internal face flatness≤2mm, reduce magnetic field intensity, to reduce the impact of washing away liquid-solid boundary fltting speed as far as possible.
8) when drawing finishes, after the molten iron 6 in molten iron pouring ladle 4 is all poured out, open the stopper 24 of letting out iron hole 23, release whole molten iron, close rotating magnetic field generator 2 and hauling machine power supply simultaneously.
9) in the time that L-type continuous casting holding furnace 3 temperature are reduced to room temperature, close the water inlet pipe of crystallizer 1 and rotating magnetic field generator 2, finish drawing.
Certainly dial in process specifically drawing, because graphite cannula 9 and refractory tube 14 be consumable accessory, when using after one-period, just need to more renew, special equipment need consider that the readily removable of graphite cannula 9 and refractory tube 14 removes property and be convenient to installation property.
The hollow cast iron tubing that adopts said method to prepare, the inherence of body is organized fine and closely woven, and inboard wall of tube body is the finish side without Bamboo-shaped cranse, and the flatness error of finish side is less than 2mm.
The special equipment of the hollow cast tube of a kind of vertical continuous casting is provided, there is crystallizer 1, rotating magnetic field generator 2 and L-type continuous casting holding furnace 3, described L-type continuous casting holding furnace 3 left ends are placed in molten iron pouring ladle 4 lower ends, described rotating magnetic field generator 2 is fixed on L-type continuous casting holding furnace 3 right-hand member end faces, described crystallizer 1 is fixed on rotating magnetic field generator 2 upper surfaces, jointly forms with L-type continuous casting holding furnace 3 left ends the U-shaped passage 5 circulating for molten iron 6.
Above-mentioned crystallizer 1 comprises graphite cannula 9 and steel water collar 10, described graphite cannula 9 is pressed in steel water collar 10, described graphite cannula 9 and steel water collar 10 upper surfaces are provided with crystallizer upper flange 11, and steel water collar 10 lower surfaces are provided with crystallizer lower flange 12 and crystallizer lower flange 12 is stretched out in graphite cannula 9 lower ends; Described rotating magnetic field generator 2 comprises water collar 13, refractory tube 14 and magnet exciting coil 15, and water collar 13 preferably polytetrafluoroethylene materials are made and water collar 13 is screw type water collar, and the preferred corundum-mullite material of refractory tube 14 is made; Described water collar 13 inserts in magnet exciting coil 15 endoporus, described refractory tube 14 inserts in water collar 13 endoporus and between the two to be filled in and establishes fire-resistant cotton 22, described water collar 13 and magnet exciting coil 15 upper surfaces are provided with magnetic field generator upper flange 16, and water collar 13 and magnet exciting coil 15 lower surfaces are provided with magnetic field generator lower flange 17 and magnetic field generator lower flange 17 is stretched out in refractory tube 14 lower ends; Above-mentioned water collar 13 is screw type water collar, comprise that band spiral fluted body 28 and cylindrical outer wall 29 and both interference fits are integrated, described cylindrical outer wall 29 is from being inserted in the spiral channel that forms sealing with spiral fluted body 28 one end, the upper and lower of described cylindrical outer wall 29 is all shaped with screw, described magnet exciting coil is all shaped with through hole on two terminal circle perisporium Shang Xia 15, the water inlet pipe 26 of described water collar 13 and outlet pipe 27 insert and be tightened in the screw of cylindrical outer wall 29 excircles from through hole.Refractory tube 14 is as circulation molten iron 6; water collar 13 is protected magnet exciting coil 15 to avoid high temperature and is damaged; magnet exciting coil 15 wants guarantee effect to be greater than 500Gs in the magnetic field intensity of molten iron heart portion; to can drive molten iron rotation; draw magnetic field intensity difference required while dialling different hollow cast tube, can be by regulating size of current to control.Rotating excitation field makes molten iron 6 High Rotation Speeds in crystallizer 1, when rotary speed reaches the desired value of centrifugal force formula of vertical centrifugal casting, just in crystallizer 1, forms V font liquid level.
After rotating magnetic field generator 2 starts, rotating excitation field drives the molten iron 6 in rotating magnetic field generator 2 to rotate, and drives again subsequently the molten iron 6 in crystallizer 1 to rotate, and this rotatablely moves and produces following effect:
1, make molten iron 6 solidify required convection current, diabatic process morphs, reduced molten iron fluid column footpath upwards and axially on thermograde, strengthened the feature that stratiform is solidified, be conducive to equiax crystal nucleation, existence and growth;
2, the Fast Growth that has interrupted a dendrite is washed away in the rotation of molten iron 6, has expanded the ratio of equiaxed grain structure; Disturb mass transport process, homogenizing component distributing in molten iron, avoid component segregation, reduced the difference of tube wall ectonexine metallographic structure;
3, for the drawing of every step pitch, in the time that drawing just finishes, molten iron 6 in graphite cannula 9 is highly minimum, but the amount of molten iron 6 is now also minimum, under fixing rotary speed, the difference in height maximum of V font liquid level, along with drawing the continuous injection of dialling pause molten iron 6, molten iron 6 increases, and V font liquid level is poor to be reduced gradually.The fluctuation that this liquid level is poor, has eliminated drawing pause liquid level top layer and has been set in the Bamboo-shaped annular boss (cranse) forming on pipe material inner wall; And washing away continuously that molten iron fluid column rotation forms liquid-solid boundary makes pipe material inner wall level and smooth, week upwards uniformity, internal diameter size precision greatly improves.
Above-mentioned L-type continuous casting holding furnace 3 comprises L-type pedestal 18, on described L-type pedestal 18, be shaped with passage 19, described graphite cannula 9 lower ends are communicated with refractory tube 14 upper port through magnetic field generator upper flange 16, described refractory tube 14 lower ends are communicated with the U-shaped passage 5 that formation is circulated for molten iron 6 with passage 19 end ports, connecting bolt 20 is through crystallizer lower flange 12, magnetic field generator upper flange 16 and lower flange 17, crystallizer 1 and rotating magnetic field generator 2 are connected as one, described magnetic field generator lower flange 17 is connected to one by stainless steel connecting plate 21 and L-type pedestal 18 right-hand members, described L-type pedestal 18 right-hand member sidepieces are shaped with to be let out iron hole 23 and uses stopper 24 jam-packs.
Above-described embodiment, is preferred embodiment of the present invention, is not used for limiting the scope of the present invention, and the equivalence of being done with content described in the claims in the present invention therefore all changes, within all should being included in the claims in the present invention scope.
Claims (5)
1. the special equipment of the hollow cast tube of vertical continuous casting, it is characterized in that: there is crystallizer (1), rotating magnetic field generator (2) and L-type continuous casting holding furnace (3), described L-type continuous casting holding furnace (3) left end is placed in molten iron pouring ladle (4) lower end, described rotating magnetic field generator (2) is fixed on L-type continuous casting holding furnace (3) right-hand member end face, described crystallizer (1) is fixed on rotating magnetic field generator (2) upper surface, jointly forms the U-shaped passage (5) for molten iron (6) circulation with L-type continuous casting holding furnace (3) left end.
2. the special equipment of the hollow cast tube of vertical continuous casting according to claim 1, it is characterized in that: described crystallizer (1) comprises graphite cannula (9) and steel water collar (10), described graphite cannula (9) is pressed in steel water collar (10), described graphite cannula (9) and steel water collar (10) upper surface are provided with crystallizer upper flange (11), and steel water collar (10) lower surface is provided with crystallizer lower flange (12) and crystallizer lower flange (12) is stretched out in graphite cannula (9) lower end, described rotating magnetic field generator (2) comprises water collar (13), refractory tube (14) and magnet exciting coil (15), described water collar (13) inserts in magnet exciting coil (15) endoporus, described refractory tube (14) inserts in water collar (13) endoporus and between the two to be filled in and establishes fire-resistant cotton (22), described water collar (13) and magnet exciting coil (15) upper surface are provided with magnetic field generator upper flange (16), water collar (13) and magnet exciting coil (15) lower surface are provided with magnetic field generator lower flange (17) and magnetic field generator lower flange (17) is stretched out in refractory tube (14) lower end, described L-type continuous casting holding furnace (3) comprises L-type pedestal (18), on described L-type pedestal (18), be shaped with passage (19), described graphite cannula (9) lower end is communicated with refractory tube (14) upper port through magnetic field generator upper flange (16), described refractory tube (14) lower end is communicated with the U-shaped passage (5) forming for molten iron (6) circulation with passage (19) end port, connecting bolt (20) is through crystallizer lower flange (12), magnetic field generator upper flange (16) and magnetic field generator lower flange (17), crystallizer (1) and rotating magnetic field generator (2) are connected as one, described magnetic field generator lower flange (17) is connected to one by stainless steel connecting plate (21) and L-type pedestal (18) right-hand member, described L-type pedestal (18) right-hand member sidepiece is shaped with to be let out iron hole (23) and uses stopper (24) jam-pack.
3. the special equipment of the hollow cast tube of vertical continuous casting according to claim 2, is characterized in that: described water collar (13) polytetrafluoroethylene (PTFE) material is made; Described refractory tube (14) is made by corundum-mullite material.
4. according to the special equipment of the hollow cast tube of vertical continuous casting described in claim 2 or 3, it is characterized in that: described water collar (13) is screw type water collar, comprise that band spiral fluted body (28) and cylindrical outer wall (29) and both interference fits are integrated, described cylindrical outer wall (29) is inserted in from band spiral fluted body (28) one end, the spiral channel that forms sealing, the upper and lower of described cylindrical outer wall (29) is all shaped with screw.
5. the special equipment of the hollow cast tube of vertical continuous casting according to claim 4, it is characterized in that: on the upper and lower two terminal circle perisporium of described magnet exciting coil (15), be all shaped with through hole, water inlet pipe (26) and the outlet pipe (27) of described water collar (13) insert and are tightened in the screw of cylindrical outer wall (29) excircle from through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320837519.6U CN203599494U (en) | 2013-12-18 | 2013-12-18 | Device special for performing perpendicular continuous casting on hollow cast tubes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320837519.6U CN203599494U (en) | 2013-12-18 | 2013-12-18 | Device special for performing perpendicular continuous casting on hollow cast tubes |
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| Publication Number | Publication Date |
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| CN203599494U true CN203599494U (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320837519.6U Expired - Lifetime CN203599494U (en) | 2013-12-18 | 2013-12-18 | Device special for performing perpendicular continuous casting on hollow cast tubes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015089959A1 (en) * | 2013-12-18 | 2015-06-25 | 陕西同心连铸管业科技有限公司 | Hollow cast iron pipe, and vertical continuous casting method and special equipment for same |
| CN105834386A (en) * | 2016-06-15 | 2016-08-10 | 江苏华龙铸铁型材有限公司 | Continuous casting device of high temperature alloy tubes and continuous casting method of high temperature alloy tubes |
| CN111889639A (en) * | 2020-08-04 | 2020-11-06 | 镇江尚恩工程机械制造有限公司 | Production line for vertically and continuously casting ultra-long pipe and use method thereof |
-
2013
- 2013-12-18 CN CN201320837519.6U patent/CN203599494U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015089959A1 (en) * | 2013-12-18 | 2015-06-25 | 陕西同心连铸管业科技有限公司 | Hollow cast iron pipe, and vertical continuous casting method and special equipment for same |
| CN105834386A (en) * | 2016-06-15 | 2016-08-10 | 江苏华龙铸铁型材有限公司 | Continuous casting device of high temperature alloy tubes and continuous casting method of high temperature alloy tubes |
| CN111889639A (en) * | 2020-08-04 | 2020-11-06 | 镇江尚恩工程机械制造有限公司 | Production line for vertically and continuously casting ultra-long pipe and use method thereof |
| CN111889639B (en) * | 2020-08-04 | 2021-11-16 | 江苏华龙铸铁型材有限公司 | Production line for vertically and continuously casting ultra-long pipe and use method thereof |
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Denomination of utility model: Device special for performing perpendicular continuous casting on hollow cast tubes Effective date of registration: 20190829 Granted publication date: 20140521 Pledgee: Qianxian County rural credit cooperatives Pledgor: SHAN XI TONGXIN LIANZHU PIPE INDUSTRY Co.,Ltd. Registration number: Y2019980000080 |
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Date of cancellation: 20231227 Granted publication date: 20140521 Pledgee: Qianxian County rural credit cooperatives Pledgor: SHAN XI TONGXIN LIANZHU PIPE INDUSTRY Co.,Ltd. Registration number: Y2019980000080 |
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