CN101708538B - High-performance magnesium alloy parison continuous casting production line - Google Patents
High-performance magnesium alloy parison continuous casting production line Download PDFInfo
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Abstract
The invention discloses a high-performance magnesium alloy parison continuous casting production line and relates to the technical fields of vacuum magnesium alloy metallurgy and material preparation. The production line is used for producing high-strength deformation magnesium alloy parison materials by whole-course vacuum protection. Equipment for the production line is provided with two vertical melting furnaces used for melting magnesium medium alloy or working alloy, wherein each melting furnace is divided into the two following parts in space: a hermetic melting chamber and a hermetic furnace body; and the pressure of the furnace body is lower than that of the melting chamber so as to form a vacuum barrier and double vacuum protection melting. Feeding cabins are arranged above furnace covers of the melting furnaces, and the opening and closing of doors of the cabins is matched with the conversion of pressure in the cabins so as to eradicate oxidization and burning of magnesium during feeding materials into hot furnaces. A heat insulation and homogenization furnace is arranged between the two melting furnaces to mix liquid coming from the melting furnaces and prepare magnesium alloy containing target components, and then the heat insulation and homogenization furnace stand still to preserve heat. An inoculation agent and leavening agent flowing addition mechanism is arranged on a gap bridge so as to effectively increase cores and prevent recession. Magnetic stirring is carried out in a crystallization process to control the pressing force and the traction speed of a tractor in real time. The equipment has compact structure, safe production and no pollution.
Description
Technical field:
The present invention relates to vacuum magnesium alloy metallurgical technology field and technical field of material, the integrated complete equipment that specifically a kind of high-strength deforming magnesium alloy parison continuous casting is produced.
Background technology:
In the fields such as automobile and motorcycle, using high-strength high-tractility magnesium alloy forging to be subjected to widely payes attention to, in the face of the demand of the parison material of large quantities of a large amount of magnesium alloy forging, wish magnesium alloy fusing, liquid modified, solidify the integrated advanced technologies of process such as middle refinement and continuous casting.But because the vapour pressure of magnesium is high, cause in magnesium alloy fusing inflammable and explosive oxidizable problem outstanding especially, so the protection of magnesium alloy fused mass is subject to the attention of people's height always.
For solving the Melting Problem of magnesium alloy; people's research and development a series of new technical measures; be included in the resist technology of weld pool surface covering flux, the gas shield technology of starvation and add alloy material to form interface tech of dense oxidation film etc. in magnesium alloy liquid pressure; effectively protected magnesium melt, but be much at the cost of the environment.Vacuum protection is the most rational technical measures in alloy material metallurgy, and vacuum, in magnesium alloy smelting practical application, is a kind of means of displaced air at present, but not real vacuum metallurgy.
Horizontal continuous-casting is widely used in steel billet material and aluminum alloy blank, occurs in recent years the patent report of magnesium alloy horizontal caster and special alloy vacuum continuous casting, Chinese patent: CN1317383, CN1943911, CN101462156A.CN1317383 is traditional enforceable continuous casting scheme, CN1943911 is the redaction of same unit, fusing and continuous casting are integrated, system is simplified, undercurrent technology effectively prevents that magnesium alloy is at oxidation and the combustion problem of casting process, and CN101462156A is the continuous casting scheme of vacuum metling special alloy.In above patent report, do not show, how hot stove is reinforced prevents magnesium alloy oxidation and burns; Remaining magnesium alloy Disposal Measures after blowing out; The melting operation that how to solve separate unit melting furnace and continuous casting operation conflicting in time.
Summary of the invention:
The present invention seeks to develop a kind of continuous casting product line of producing high-strength deforming magnesium alloy parison material, guarantee that magnesium alloy materials fusing, preparation and continuous casting production overall process are safe and pollution-free.
Another object of the present invention is that minimum energy resource consumption obtains largest production efficiency.
Technical scheme and embodiment:
For above object is taked following measure; it is whole process using vacuum protection; comprise in hot stove that raw material add, the fusing of magnesium alloy materials guarantees fusing operation with the buffering of preparation, insulation homogenizing furnace and continuous casting operation synchronize in time, liquid material modification breed with rotten, crystallization process in the links such as cooling and stirring refinement; under the closed environment without external interference, work, reached the free of contamination design object of overall process.In addition, the present invention does not refer to intermediate alloy and work alloy for conventional cast with raw material, but selects the stock of least significant end as far as possible, as pure magnesium, a small amount of and micro-additional simple metal or alloy material, reduces energy resource consumption, reduces each link polluting.
The invention is characterized in, 1. feeding chamber (Fig. 1-1), raw material enter the spatial transition of melting furnace, and the hot crucible of avoiding remaining magnesium alloy fused mass directly communicates with atmosphere when reinforced, also completes in addition dehydration, deoils, except floating dust and warm-up operation task.Feeding chamber is provided with 3 road hermatic doors and adds trolley, and warehouse entry door (Fig. 2-1.1), goes out door (Fig. 2-1.2), and molten metal samples or spies on door (Fig. 2-1.3), adds trolley (Fig. 2-1.4).T
1, p
1represent respectively room temperature and atmospheric pressure outside feeding chamber; T
2, p
2represent respectively temperature and pressure in feeding chamber; T
3, p
3represent respectively temperature and pressure in fusion crucible.P
2water, oil, press (common 1～100Pa pollutes depending on outward appearance) except the evaporation of floating dust; p
3magnesium alloy do not evaporate pressure (5～80KPa, depending on material composition).T
3temperature in crucible, is greater than the current intermediate alloy fusing point of founding, and is not less than the fusing point of pure magnesium.Add trolley two station alternations, i.e. feed position and go out material level.Raw material warehouse entry initial conditions is, reinforced moving of car is to feed position, goes out door, spies on door, warehouse entry door is closed, vacuum p
2=p
3.Reinforced operating process is to discharge vacuum p
2=p
1, open warehouse entry door, pack raw material into adding trolley, close warehouse entry door, set up vacuum p
2, keep p
2, complete surface evaporation water, oil and remove floating dust operation, set up vacuum p
2=p
3, open out door, remain to T
2, reinforced moving of car is to going out material level, reinforced complete, adds trolley and returns to feed position, closes out door, completes a circulation.Molten metal sampling or spy on door, spies on the used time need not operate, and during sampling, with sampling mechanism, replaces adding trolley, its operation with feed in raw material similar.2. melting furnace (Fig. 1-2), configures 2 vertical induction furnaces in present device, is used for respectively melting intermediate alloy or the work alloy of different melting points; By induction heating power (Fig. 1-2 .1), interlayer crucible (Fig. 1-2 .2), ceramic insulation circle (Fig. 1-2 .3), cold-crucible lid (Fig. 1-2 .4) and airtight furnace shell (Fig. 1-2 .5), formed.Furnace shell comprises shaft and furnace bottom, shaft open top, and opening size is less than interlayer crucible flange, and shaft and furnace bottom be according to flange standard seal, nonmagnetic stainless steel manufacture for furnace shell.The flange of interlayer crucible has adopted water-cooled, placing ceramic insulating collar on flange, between flange-porcelain ring-furnace shell, adopt end face seal standard seal, furnace shell inner surface/ceramic insulation circle outer surface/interlayer crucible outer surface forms airtight body of heater thus, is placed with the furnace building material that produces the induction coil of thermal source and the yoke of armoured magnetic field and the heat insulation use of thermal insulating in airtight body of heater.At the remaining space build-up pressure of airtight body of heater, require lower than the pressure in interlayer crucible, form vacuum barrier, increased the security of fusion process; In addition, be operated in the airtight body of heater under vacuum condition, can make the radiation heat loss of interlayer crucible outer surface reduce, saved energy.Induction heating power principle is three-phase (friendship)-single-phase (friendship) series resonance, not only can heat but also can stir.Interlayer crucible, internal layer is low-carbon (LC) pot body, and skin is non-magnetic high-temperature steel, and centre vacuumizes.Ceramic insulation circle, is arranged between crucible body and crucible cover, reduces interlayer crucible body heat conduction loss, alleviates the thermic load of crucible cover.Cold-crucible lid seals with the outer surface of furnace shell opening part, consists of the melting space of magnesium alloy materials cold-crucible interior surface/ceramic insulation circle inner surface/interlayer inner surface of crucible.Cold-crucible interior surface is arched top, reduces interlayer crucible and melt thermal radiation loss; Water-cooled is arranged near sealing medium, solves the lasting sealing problem of crucible cover.Pressure in airtight body of heater is less than p
3, reduce interlayer crucible radial radiation on the one hand, form on the other hand oxidation and evaporation that vacuum barrier reduces magnesium alloy solution.Between interlayer crucible and induction coil, adopt nanometer heat insulation material to fill, during 800 ℃ of hot-face temperatures, thermal conductivity factor is 0.038W/ (m.k), more than can save energy 30-50%.3. mozzle (Fig. 1-3), imports to the metal liquid in melting furnace in holding furnace, differential pressure conveying principle.Comprise molten metal entrance and molten metal outlet, entrance, in fusing furnace side, is deep in magnesium alloy fused mass, and outlet is above insulation furnace side.At mozzle two ends, set up pressure reduction, Δ p=γ Δ h is p
4-p
3=γ (h
3-h
4), metal liquid just flows.In formula, be p
3pressure in fusion crucible, h
4liquid outlet height can not change in actual production; p
4holding furnace internal pressure is differential pressure controlled quentity controlled variable; h
3the height of metal bath surface, flows out gradually and reduces with liquid, is variable quantity; γ magnesium alloy proportion is a constant after material composition and temperature are determined.Rewrite above formula and obtain p
4=γ h
3+ C, can control water conservancy diversion by two kinds of modes.Constant speed method, with the height h of metal bath surface
3reduce p
4pressure reduces; Constant-voltage method, refers to constant pressure p
4, this pressure and h
3minimum of a value corresponding.Constant-voltage method is controlled simple, and constant speed method liquid flow is steady.4. be incubated homogenizing furnace (Fig. 1-4), by molten metal intake, supervision and gathering hole (Fig. 1-4.1), molten metal export mouth (Fig. 1-4.2) and electromagnetic agitation and attemperator (Fig. 1-4.3), formed.Carry independently eddy-current heating source, between insulation crucible and heater, adopt nanometer heat insulation material to fill, improve the utilization rate of the energy, under vacuum protection, complete homogenizing and insulation, accomplish safety non-pollution.Structural form is, homogenizing furnace is horizontal is placed on 2 melting furnace axial symmetry faces in insulation, axis and 3 ° of inclination angles of horizontal plane of insulation homogenizing furnace.Insulation homogenizing furnace task be by from 2 melting furnace molten metal mixed preparing to target component, standing through being incubated, by gaps bridge, export to crystallizer, gathering hole is used for sample analysis and treats supplementary alloy material with adding.Molten metal intake is draft tube outlets, is setting up p
4after pressure, melting furnace metal bath is introduced in insulation homogenizing furnace; Electromagnetic agitation is mixed magnesium intermediate alloy or the work alloy of 2 melting furnaces with attemperator, complete temperature and homogenization of composition.Insulation homogenizing furnace adopts two electromagnetic agitation, and the form of the composition is that 2 induction stirring coils are separately positioned on to insulation crucible front and rear part, and the middle part of insulation crucible is provided with water cooling plant, is conducive to the adjustment of magnesium alloy fused mass temperature and stirring.5. pass a bridge (Fig. 1-5), connect insulation crucible and crystallizer passage, on passing a bridge, arranged emergency closure (Fig. 1-5.1), inovulant adds mechanism (Fig. 1-5.2) with stream.Gap bridge is opened in the side of insulation crucible, and minimum point, higher than at the bottom of insulation crucible, is not incubated not remaining liquid in crucible while guaranteeing prepurging, and hydrostatic head is the highest herein, is dangerous section, and emergency closure is used for processing emergency episode.Emergency closure is gate valve aufbauprinciple, manual-lock when chance failure appears in crystallizer, and sealing is passed a bridge and is guaranteed not outward leakage of magnesium liquid, and in normal production, emergency closure does not participate in any operation.Emergency closure is arranged on nearly insulation crucible one side of gap bridge, emergency closure is in the thermal treatment zone of holding furnace to the magnesium alloy in insulation crucible gap bridge, once run into during accidental power failure closing gate, after incoming call, utilize the heating source heating of insulation homogenizing furnace, even if condense also can melt again, guarantee that continuous casting proceeds.Current-following inoculation, the important means of raising magnesium alloy strength, hardness and toughness.Carrying inovulant pipe extend into gap bridge from gap bridge side, pipe center overlaps with gap bridge central horizontal face, the sealing of pipe front end, inovulant outlet distribution pipe radially with liquid flow in the same way, adopt screw feeder mode that inovulant pressurization is sent to outlet, the magnesium alloy liquid pressure flowing is brought inovulant into.Inovulant pipe moves forward and backward together with screw(-type) feeder under linear electric motors drive, and displacement is not more than 2/3 of gap bridge diameter.Inovulant pipe just inserts after draw bar leaves, and the speed of screw feeder is being controlled the addition of inovulant.Inovulant adds being arranged between insulation homogenizing furnace and crystallizer of mechanism with stream.6. crystallizer (Fig. 1-6), to be solid material through the magnesium alloy fused mass crystallization of breeding or go bad after processing, in order to improve material metallographic structure in crystallization process, Gu to being in liquid phase and liquid/two-phase section material applies the further crystal grain thinning of mixing power, having built rotating excitation field and produced mixing power.Crystallizer is comprised of crystallizer inner sleeve, crystallizer water-cooling jacket (Fig. 1-6.1), rotating magnetic field generator (Fig. 1-6.2), the outer cooler (Fig. 1-6.3) of crystallizer, front and back seal cover and travel(l)ing rest.The frequency of rotating excitation field and amplitude change by the control system of three phase variable frequency; Cooling water flow regulates by the measured value real-time tracking of cooling water outlet temperature; Travel(l)ing rest has two frees degree, a translation and a rotation, and translation solves the installation matching problem of crystallizer and gap bridge, and rotary freedom is rotated in a clockwise direction crystallizer to leave gap bridge, is convenient to the maintenance of passing a bridge.7. hauling machine (Fig. 1-7), two Horizontal weld type mode of traction, upper and lower carry-over pinch rolls shape forms the part envelope of magnesium alloy parison profile.Lower carry-over pinch rolls are main driving, adopt three-phase frequency-conversion speed-regulation mode, form closed-loop control system regulate in real time with crystallizer port of export continuously cast temperature, and continuously cast temperature has adopted contact-free measurement of temperature method.Upper carry-over pinch rolls are moved up and down by the control of three phase variable frequency spiral lift, set up adjustable thrust; The power that strain transducer is measured and spiral lift motion form real-time regulation scheme, guarantee that hauling speed is steady.Two tractions, can flexible combination be " draw-push away-stop " various modes of operation, also can be aspect " single action-interlock " independent assortment.By above-mentioned controlling unit, the uniformity of continuous casting magnesium alloy base material axial property is better.The advantage having and beneficial effect:
1. the application of feeding chamber has changed the reinforced operating type of the hot stove of conventional cast, and magnesium alloy is not directly communicated with atmosphere, there is no the radiation of burning and crucible high temperature, obtains good working environment.
2. vacuum whole process protection, oxide inclusion reduces, and dissolved gas reduces, and magnesium alloy materials is significantly purified, and improves magnesium alloy strength and deformability.
3. melting furnace is directly prepared intermediate alloy or work alloy, and insulation homogenizing furnace mixed preparing target alloy, cuts down the number of intermediate links, simple to operate, energy conservation, and material composition uniformity is better.
Melting furnace shell and sealed crucible and in the vacuum barrier that forms and crucible vacuum form the melting mode of two vacuum, both looked after the high objective fact of vapour pressure of magnesium, stoped again the direct effect of airborne oxygen to high temperature magnesium melt, production process is safer, and material property is better.
5. inovulant adds mechanism with stream, is conducive to inovulant, alterant adds and play one's part to the full, and increases core, prevents inoculation fade, reduces inovulant, alterant consumption.
6. rotary magnetic field stirring in crystallization process, the broken main shaft perpendicular to the growth of heat transfer direction is brilliant, and refinement microstructure, improves magnesium alloy materials obdurability.
7. real-time temperature and thrust are controlled, and guarantee that the running under power speed of hauling machine is steady, make the uniformity of continuous casting magnesium alloy parison axial property better.
8. the magnesium alloy parison of the as cast condition diameter 100mm producing at present, more than tensile strength is stabilized in 400MPa, extends and is greater than 18%.
Accompanying drawing explanation:
Fig. 1 high-performance magnesium alloy parison continuous casting production line capital equipment structural design cutaway view
Fig. 2 feeding chamber structural design cutaway view
Fig. 3 production line capital equipment layout drawing
Claims (8)
1. a high-performance magnesium alloy parison continuous casting device, comprises feeding chamber (1), melting furnace (2), and mozzle (3), insulation homogenizing furnace (4), passes a bridge (5), crystallizer (6), hauling machine (7), is characterized in that:
2 vertical eddy-current heating fusing stoves, for Melting Magnesium intermediate alloy, or the work alloy of Melting Magnesium, bell top, every melting furnace top is placed with feeding chamber (1), the keying of reinforced door matches with the conversion of storehouse internal pressure, when packing hot stove into, raw material there is no magnesium oxidizing fire, 1 Horizontal thermal insulation homogenizing furnace, be placed in the middle of 2 melting furnaces, three's vertical central plane alignment, liquid in melting furnace enters insulation homogenizing furnace by mozzle, insulation homogenizing furnace liquid outlet, pass a bridge, crystallizer and the traction horizontal center of roll shaft conllinear, insulation homogenizing furnace liquid outlet and gap bridge are welded to connect, insulation homogenizing furnace shell and crystallizer, pass a bridge and adopt dismountable mechanical connection with crystallizer, magnesium raw material enter omnidistance vacuum protection after described device, described feeding chamber (1), by warehouse entry door (1.1), be communicated with surrounding environment, go out door (1.2) and be communicated with melting furnace, spy on door (1.3) sampling molten metal, add trolley (1.4) transhipment raw material, under 1～100Pa pressure, evaporate water, the oil on raw material and absorb tiny floating dust.
2. according to the high-performance magnesium alloy parison continuous casting device described in right 1, it is characterized in that: described melting furnace (2), by cold-crucible lid (2.4) and airtight body of heater, created, the inner wall space of cold-crucible lid, interlayer crucible (2.2), ceramic insulation circle (2.3) forms airtight melting chamber.
3. according to the high-performance magnesium alloy parison continuous casting device described in right 2, it is characterized in that: described airtight body of heater is created by flat seal mode by interlayer crucible, ceramic insulation circle and airtight furnace shell (2.5), the water flowing of interlayer crucible flange is cooling, airtight body of heater vacuumizes, pressure is less than airtight melting chamber, forms vacuum barrier.
4. according to the high-performance magnesium alloy parison continuous casting device described in right 1, it is characterized in that: described insulation homogenizing furnace (4) comprises electromagnetic agitation and attemperator (4.3), stir and be incubated based on electromagnetic induction principle, be arranged in the front and back of insulation crucible, form two electromagnetic switching devices.
5. according to the high-performance magnesium alloy parison continuous casting device described in right 1, it is characterized in that: described gap bridge (5) disposes emergency closure (5.1) and inovulant adds mechanism (5.2) with stream.
6. according to the high-performance magnesium alloy parison continuous casting device described in right 5, it is characterized in that: described inovulant adds arrangement of mechanism between insulation homogenizing furnace and crystallizer with stream, by carrying inovulant pipe and screw(-type) feeder, form, from gap bridge side, extend into gap bridge, the sealing of pipe front end, discharging direction on inovulant pipe and magnesium alloy liquid pressure flow in the same way, inovulant pipe can move forward and backward together with screw(-type) feeder under linear electric motors drive, and changes inovulant discharging opening in gap bridge Zhong position.
7. according to the high-performance magnesium alloy parison continuous casting device described in right 1, it is characterized in that: described crystallizer (6) is an overall structure of according to axle static seal standard, graphite inner sleeve, crystallizer water-cooling jacket (6.1), rotating magnetic field generator (6.2), the outer cooler of crystallizer being set up by front and back seal cover, and rear seal cover adopts dismountable mechanical system to be connected with gap bridge.
8. according to the high-performance magnesium alloy parison continuous casting device described in right 1, it is characterized in that: described hauling machine (7) is two Horizontal weld type tractions, hauling machine is adjustable to crystallizer distance, between two hauling machines, distance is adjustable in 0-1m scope, by three-phase frequency-conversion speed-regulation mode, drive carry-over pinch rolls, with three-phase frequency-conversion speed-regulation spiral lift, thrust is delivered to parison by pressure roller, parison outlet temperature and parison hauling speed form closed-loop control system.
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|---|---|---|---|
| CN200910222345.0A CN101708538B (en) | 2009-11-16 | 2009-11-16 | High-performance magnesium alloy parison continuous casting production line |
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|---|---|---|---|
| CN200910222345.0A CN101708538B (en) | 2009-11-16 | 2009-11-16 | High-performance magnesium alloy parison continuous casting production line |
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| CN104209486B (en) * | 2014-07-10 | 2016-04-20 | 中国重型机械研究院股份公司 | A kind of magnesium alloy circle base continuous casting apparatus and technique |
| CN105880495A (en) * | 2016-04-18 | 2016-08-24 | 江苏江海机床集团有限公司 | Aluminum magnesium alloy production line |
| CN105689671A (en) * | 2016-04-19 | 2016-06-22 | 江苏中科亚美新材料有限公司 | Magnesium alloy production operation line |
| CN105689670A (en) * | 2016-04-19 | 2016-06-22 | 江苏中科亚美新材料有限公司 | Magnesium alloy production operation line |
| CN111872335A (en) * | 2020-08-04 | 2020-11-03 | 天津宏镁科技有限公司 | Horizontal continuous casting production line |
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| DE10156034A1 (en) * | 2001-11-15 | 2003-06-05 | Peter Stolfig | Production of profiles or shaped sheets, of magnesium or magnesium alloys, in a continuous production line coupled to the smelting furnace with continuous casting and cutting and shaping in protective gas/vacuum zone |
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| CN1759955A (en) * | 2005-09-11 | 2006-04-19 | 大连理工大学 | Horizontal electromagnetism method and equipment for casting sheet and strip made from copper alloy continuously |
| CN101024243A (en) * | 2006-02-24 | 2007-08-29 | 山东理工大学 | Heat type continuous casting method for making large-cube non-crystal alloy and apparatus thereof |
| CN101121980A (en) * | 2007-09-20 | 2008-02-13 | 王仁辉 | Technique for processing high-strength high-tractility magnesium alloy member |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10156034A1 (en) * | 2001-11-15 | 2003-06-05 | Peter Stolfig | Production of profiles or shaped sheets, of magnesium or magnesium alloys, in a continuous production line coupled to the smelting furnace with continuous casting and cutting and shaping in protective gas/vacuum zone |
| CN1676239A (en) * | 2005-04-28 | 2005-10-05 | 加西贝拉压缩机有限公司 | Flashboard type throttling current-following inoculation device |
| CN1730200A (en) * | 2005-08-15 | 2006-02-08 | 西安理工大学 | Equipment for horizontal continuous casting magnesium alloy wire material and horizontal continuous casting method thereof |
| CN1759955A (en) * | 2005-09-11 | 2006-04-19 | 大连理工大学 | Horizontal electromagnetism method and equipment for casting sheet and strip made from copper alloy continuously |
| CN101024243A (en) * | 2006-02-24 | 2007-08-29 | 山东理工大学 | Heat type continuous casting method for making large-cube non-crystal alloy and apparatus thereof |
| CN101121980A (en) * | 2007-09-20 | 2008-02-13 | 王仁辉 | Technique for processing high-strength high-tractility magnesium alloy member |
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| CN101708538A (en) | 2010-05-19 |
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