CN105215303B - A kind of device and method of magnesium alloy slab DC castings - Google Patents
A kind of device and method of magnesium alloy slab DC castings Download PDFInfo
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- CN105215303B CN105215303B CN201510721105.0A CN201510721105A CN105215303B CN 105215303 B CN105215303 B CN 105215303B CN 201510721105 A CN201510721105 A CN 201510721105A CN 105215303 B CN105215303 B CN 105215303B
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Abstract
The present invention provides a kind of device and method of magnesium alloy slab DC castings, and described device includes level gauging system, cloth streaming system and casting system, and level gauging system includes laser liquid-level analyzer, metal case and feeler lever；Cloth streaming system includes mozzle, Shang Cang, lower storehouse and shunting disk；Casting system includes crystallizer and dummy ingot block.The method that DC castings are carried out using described device, processing step is：（1）Each part of device is assembled in order, is moved in crystallizer on adjustment dummy ingot block；（2）Upper storehouse is vacuumized, magnesium alloy fused mass is introduced to crystallizer, protective gas is passed through, starts casting；（3）Kind and cast ingot dimension control casting speed according to magnesium alloy, when ingot casting is close to predetermined length, stops casting；（4）According to step（1）Assembling process take each part apart.The magnesium alloy ingot any surface finish prepared using apparatus of the present invention and method, flawless and cold shut, inside ingot even tissue, alloying element gross segregation rate are low.
Description
Technical field
The present invention relates to the device and method of magnesium alloy DC castings, and in particular to a kind of device of magnesium alloy slab DC castings
And method.
Background technology
Magnesium alloy is due to oxidizable and burning, so the difficulty of its DC castings is larger, especially large scale ingot blank, such as big chi
Very little slab.The magnesium alloy ingot blank casting method that uses industrial at present is magnesium alloy in smelting furnace or stands furnace purge, quiet
Postpone, the head piece that furnace bottom is incorporated into crystallizer or opened by mozzle is flowed in crystallizer.Shunting is provided with crystallizer
Disk, melt is flowed in crystallizer by shunting disk.Crystallizer top is provided with protective gas pipe, can be to liquid level eductor protective gas.
Because crystallizer is not closed, so protective gas consumption is big, and during casting large scale ingot blank, gas shield imprecision, melt
Oxidizable, oxide is mingled with and wherein entrains into, and causes inclusion defect, reduces the metallurgical quality of ingot casting, and melt can be caused to fire when serious
Burn, make casting operation extremely dangerous.Conventional shunting disk is made of sheet metal, is lifted on bath surface, unstable
Also easily attachment oxide is mingled with and burns simultaneously.
In recent years, magnesium alloy DC castings develop some new methods.Patent CN03133390.7 casts in magnesium alloy DC
When apply low frequency magnetic field, significantly refined ingot structure, and improve the gross segregation of alloying element；Patent
CN200710010641.5 and CN200710010640.0 magnesium alloy is vertical and during horizontal casting, while apply low frequency magnetic field and
Ultrasonic field, homogenizes while tissue is significantly refined；Patent CN200810010647.7 applies oil lubrication in crystallizer wall, significantly
Improve ingot surface quality；Patent CN201110236278.5 applies low frequency pulsed magnetic fields, also achieves similar applying low frequency
The effect in magnetic field.But these inventions all do not disclose magnesium alloy DC casting flow distribution device and method.
When DC casts, cloth stream is the first pass, the flow field of melt in cloth stream influence crystallizer, therefore also be have impact in crystallizer
The temperature field of melt, and then influence tissue, Elemental redistribution and the casting internal stress of ingot casting.When in cloth adfluxion, liquid cave depth, ingot casting
Easy to crack, alloying element gross segregation is also serious；When head piece is too near away from crystallizer wall, melt will be back to casting by approach more long
Ingot middle part, is difficult to converge at middle part with the carrying out of solidification, easily forms ingot casting middle part cold shut and crackle, and middle part is opened when serious
Split, and face crack is easily formed in the side of ingot casting.When stream is spread more, due to both sides flow, the easy hot tearing of ingot casting, and stream
The low side of amount easily forms cold shut and crackle., in slab casting, problem is more aobvious tight when especially large scale slab DC casts for this
Weight.
When aluminium alloy DC casts, people start to note the influence of cloth stream.In recent years some new cloth stream methods have been invented.But
Cloth stream when being magnesium alloy DC castings is not paid attention to also.
The content of the invention
For the various problems that prior art is present, and the characteristics of combination magnesium alloy cast, the present invention provides a kind of magnesium and closes
The device and method of golden plate base DC castings.Technical scheme is as follows：
A kind of device of magnesium alloy slab DC castings, including level gauging system, cloth streaming system and casting system, liquid level are surveyed
Determining system includes laser liquid-level analyzer, metal case and feeler lever；Cloth streaming system includes mozzle, Shang Cang, lower storehouse and shunting disk；
Casting system includes crystallizer and dummy ingot block；
In metal case, laser liquid-level analyzer and feeler lever are by imbedding the wire in feeler lever for laser liquid-level analyzer
It is connected, feeler lever is from upper silo roof shell by the upper storehouse chamber of crystallizer edge insertion, the distance away from ingot casting longitudinal centre line is thick ingot casting
The 1/3~1/4 of degree, it is 10~30mm that feeler lever enters upper storehouse depth；The mozzle insert port that mozzle is set by upper silo roof shell
It is inserted into the chamber of storehouse, away from 20~30mm of shunting tray bottom；Lower storehouse is seated in crystallizer top, and its top is held with upper orlop portion
Flat, Xia Cang upper ends are connected with upper storehouse by adding the seal groove of graphite packing, and lower storehouse is fixed, and positioning is welded with the top shell in upper storehouse
Plate, position adjustable board is equipped with adjustment bolt, and upper storehouse can move left and right 10~20mm by adjustment bolt；Under crystallizer is located at lower storehouse just
Side, both realize fit sealing by being arranged on the fastener and sealing gasket in lower orlop portion；By shunting disk and knot in upper storehouse chamber
Communicated in brilliant device chamber；Crystallizer is arranged right below dummy ingot block, and dummy ingot block is fixed on the mobile platform of casting machine, mobile platform
Can be according to predetermined speed vertical downward movement.
Filter disc is flowed through including top shell, housing and cloth in the upper storehouse；Top shell is protruded than housing, top shell sealing, and tune is welded with thereon
Position plate, and it is provided with the branch chamber observation of laser liquid-level analyzer insert port, mozzle insert port, vacuum tube, installation high temp glass
Window；Wherein branch chamber observation window is located at top shell two ends at housing upper end, and quantity is 2；Housing upper end is provided with installation high temperature glass
The crystallizer observation window of glass, quantity is 2；Metal standing ring is housed, using close between high temp glass and observation window on high temp glass
Packing is sealed；The upper storehouse is made up of A3 steel plates.
The cloth flows through underface of the filter disc loaded on shunting disk conduit, is cylindrical structure, including base plate, is welded on base plate
On stainless steel cloth, the plumb post of firm stainless steel cloth and fixed steel wire upper end upper ring, wherein stainless steel wire
The size of net determines that mesh number is 20~100 mesh according to ingot casting size；Plumb post is welded on stainless steel wire on the net, and quantity is 4,
The distance of neighboring vertical pillar is 1/4 circular arc；Cloth flows through filter disc with shunting disk by penetrating filtering table mesh and shunting disk conduit
The steel wire connection of circular hole, the distance that 2 cloth flows through filter disc center line to upper storehouse center line is equal, and cloth flows through filter disc for magnesium to be closed
Golden melt level is distributed in crystallizer, filters the field trash remained from the melt that Shang Cang is flowed into, and reduce from the inflow of upper storehouse
Impact of the melt to melt in crystallizer.
The lower storehouse includes square casing and lower edge, and square casing upper end is provided with rectangular seal groove, and built-in graphite packing is real
Existing Shang Cang is tightly connected with lower storehouse, and lower edge bores 4 holes, for crystallizer connection and sealing；Square casing is long to be provided with to wall
Protective gas pipe, transverse wall both sides are provided with thermocouple insert port, the setting of insert port inserted with 2 thermocouples after with crystallizer
Heart line is that axial symmetry and 40~80mm of head distance crystallizer wall are defined, and lower storehouse is used to support storehouse, and applies protective gas,
Prevent melt oxidation；The lower storehouse is made up of A3 steel plates.
The shunting disk section is rectangular, and sealing and fixed, bottom are realized in its upper end and upper storehouse by sealing gasket and fastener
Portion is provided with 2 conduits with circular hole, and 2 catheter center's lines should be on the center line in The ingot casting thickness direction, and distance is that ingot casting is wide
The 60~80% of degree, catheter length is 50~80mm, and shunting disk is made by 304 stainless sheet steels, and thickness is 1~2mm, for magnesium
The purification and shunting of aluminium alloy.
Water tank is welded with the crystallizer, crystallizer lower edge is uniformly distributed hole for water spraying, and water tank material is stainless steel, water flowing
Shi Shuixian cooler crystallizers, are then sprayed onto in the solidified shell of ingot casting from hole for water spraying, realize quick Quench, and crystallizer is by aluminium alloy
It is made.
Sealing gasket between the high temp glass and observation window, between shunting disk and upper storehouse and between lower storehouse and crystallizer
It is made up of heat-resistant seal material.
The fastener is bolt, rivet, nut, screw or stud.
The method that the device cast using the magnesium alloy slab DC is cast, is carried out according to following processing step：
(1) cloth is first flowed through into filter disc and shunting disk conduit lower end, and lower storehouse and crystallizer is attached to by sealing by steel wire
Pad and fastener are assembled；The shunting disk that will be assembled is assembled with upper storehouse by sealing gasket and fastener；It is upper by what is assembled
Storehouse is placed on lower storehouse, adjusts adjustment bolt, Shang Cang is overlapped with the center line in lower storehouse；Insertion thermocouple, laser liquid-level analyzer,
Mozzle；The position of dummy ingot block is adjusted, makes to be moved in crystallizer on dummy ingot block；
(2) upper storehouse is vacuumized, controls vacuum for 0.01~0.05MPa, by the temperature after melting, purification for 680~
750 °C of magnesium alloy fused mass flows through filter disc and enters in crystallizer by mozzle through shunting disk, cloth, treats that magnesium alloy liquid level rises to
Shunting disk height 2/3 when, adjustment vacuum maintains liquid level stabilizing height herein, and downward storehouse is passed through protection gas, protects atmospheric pressure
It is 0.1Mpa, is passed through cooling water, start casting machine, dummy ingot block is moved down, start casting, and adjust adjustment bolt, moves left and right
Storehouse and the position of shunting disk, to keep two temperature difference of thermocouple to be less than 2 DEG C；
(3) kind according to magnesium alloy and cast ingot dimension control casting speed, when ingot casting is close to predetermined length, stop to
Enter melt；When the melt flow in upper storehouse is net, stop vacuumizing；When 1/2 height of crystallizer is down in the upper surface of ingot casting, stop
Casting machine and stopping are passed through cooling water；After after ingot casting all solidification, stopping is passed through protective gas, starts casting machine, and ingot casting departs from
Crystallizer, casting terminates；
(4) after casting terminates, upper and lower storehouse is dismantled, disk to be shunted is cooled to room temperature, according to the assembling process of step (1)
Take each part apart, and clear up cloth and flow through filter disc.
The protective gas of the step (2) is argon gas.
In casting process, if there is flue gas in crystallizer, the high temp glass on upper storehouse observation window can be carried open, treat flue gas
Put back to after disappearance.
Beneficial effects of the present invention are：
1st, the flow distribution device and cloth stream method cast magnesium alloy slab cast using magnesium alloy slab DC of the present invention, especially
During large scale slab, melt can be protected not oxidized and burnt, it is safe operation, easy to control, and ingot casting does not produce hot tearing, surface
Quality is good.
2nd, it is that the melt level of magnesium alloy is distributed in crystallizer that the cloth in apparatus of the present invention flows through filter disc effect, and is kept away
Exempt from impact of the melt to the place that becomes a mandarin too big, and the vacuum in branch chamber can further reduce the impact of melt, it is ensured that melt water
Square to full of crystallizer, so as to reduce turbulent flow, it is to avoid be mingled with and entrain into, more importantly can effectively prevent liquid cave too deep and cause
Ingot casting hot tearing and alloying elements distribution it is uneven.
3rd, the magnesium alloy ingot any surface finish prepared using flow distribution device of the invention and cloth stream method, flawless and cold
Every inside ingot even tissue, alloying element gross segregation rate is low.
Brief description of the drawings
Fig. 1 is the overall structure figure of apparatus of the present invention.
Fig. 2 is the top view of apparatus of the present invention.
Fig. 3 is the structure chart in upper storehouse in apparatus of the present invention structure.
Fig. 4 is the top view in upper storehouse in apparatus of the present invention structure.
Fig. 5 is the structure chart in lower storehouse in apparatus of the present invention structure.
Fig. 6 is the top view in lower storehouse in apparatus of the present invention structure.
Fig. 7 is the structure chart of shunting disk in apparatus of the present invention structure.
Fig. 8 is the top view of shunting disk in apparatus of the present invention structure.
Fig. 9 is that cloth flows through the structure chart of filter disc in apparatus of the present invention structure.
Figure 10 is that cloth flows through the top view of filter disc in apparatus of the present invention structure.
Specific embodiment
The present invention is further illustrated below by embodiment.It should be understood that embodiments of the invention are for illustrating
The present invention is rather than limitation of the present invention.Essence of the invention belongs to the present invention to the simple modifications that the present invention is carried out
Claimed scope.
Embodiment 1
A kind of device of magnesium alloy slab DC casting, as depicted in figs. 1 and 2, wherein 1, mozzle, 2, fastening mozzle
Bolt, 3, upper storehouse, 4, vacuum tube, 5, install high temp glass upper storehouse 3 branch chamber observation window, 6, branch chamber observation window and Qi Gao
Sealing gasket between warm glass, the sealing gasket between 7, upper storehouse 3 and shunting disk 17, the fastening spiral shell between 8, upper storehouse 3 and shunting disk 17
Bolt, 9, install high temp glass 10 upper storehouse 3 crystallizer observation window, 10, high temp glass, it is close between 11, upper storehouse 3 and lower storehouse 15
Packing, 12, protective gas pipe, the fastening bolt between 13, lower storehouse 15 and crystallizer 18,14, temperature thermocouple, 15, lower storehouse,
16th, the sealing gasket between lower storehouse 15 and crystallizer 18,17, shunting disk, 18, crystallizer, 19, connection shunting disk 17 flow through filter with cloth
The steel wire of disk 20,20, cloth flow through filter disc, 21, liquid magnesium alloy, 22, ingot casting, 23, dummy ingot block, 24, laser liquid-level analyzer, 25,
The metal standing ring of observation window high temp glass, 26, bolt of transposing on upper silo roof shell, 27, position adjustable board on upper silo roof shell, 28, metal
Box body, 29, feeler lever, 30, the water tank of crystallizer 18,31, the hole for water spraying of crystallizer 18.
Described device includes level gauging system, cloth streaming system and casting system, and level gauging system includes laser liquid-level
Analyzer 24, metal case 28 and feeler lever 29；Cloth streaming system includes mozzle 1, upper storehouse 3, lower storehouse 15 and shunting disk 17；Casting system
System includes crystallizer 18 and dummy ingot block 23；Fig. 3~8 sets forth the structure chart and top view of Shang Cang, lower storehouse, shunting disk, Fig. 3
In：32nd, the insert port of mozzle 1,36, upper silo roof shell, 37, upper storehouse housing；In Fig. 5：41st, thermocouple insert port, 42, upper and lower storehouse it
Between seal groove, 44, lower storehouse square casing, 45, lower storehouse lower edge；In Fig. 6：43rd, the connecting bolt of lower storehouse and crystallizer；In Fig. 7：
51st, tray bottom conduit, 52, supravasal circular hole are shunted；In Fig. 8：53rd, the connecting bolt in shunting disk and upper storehouse；Laser liquid-level is surveyed
Instrument 24 is determined in metal case 28, and laser liquid-level analyzer 24 is connected with feeler lever 29 by imbedding the wire in feeler lever, feeler lever
29 insert in upper storehouse chamber from upper silo roof shell 36 by the edge of crystallizer 18, and the distance away from ingot casting longitudinal centre line is The ingot casting thickness
1/3, it is 30mm that feeler lever enters upper storehouse depth；Mozzle 1 is inserted into by the mozzle insert port 32 that upper silo roof shell 36 is set
In the chamber of storehouse, away from the bottom 20mm of shunting disk 17；Lower storehouse 15 is seated in the top of crystallizer 18, and its top maintains an equal level with upper orlop portion, lower storehouse
15 upper ends are connected with upper storehouse 3 by adding the seal groove 42 of graphite packing, and lower storehouse is fixed, and position adjustable board is welded with the top shell in upper storehouse 3
27, equipped with positioning bolt 26, upper storehouse 3 can move left and right 10~20mm to position adjustable board 27 by bolt 26 of transposing；Crystallizer 18 is located at
Immediately below lower storehouse 15, both realize fit sealing by being arranged on the bolt 43 and silicic acid aluminium paper in lower orlop portion；Lead in upper storehouse chamber
Shunting disk 17 is crossed to be communicated with crystallizer chamber；Crystallizer 18 is arranged right below dummy ingot block 23, and dummy ingot block 23 is fixed on casting machine
Mobile platform on, mobile platform can be according to predetermined speed vertical downward movement.
Filter disc 20 is flowed through including top shell 36, housing 37 and cloth in the upper storehouse 3；Top shell 36 is protruded than housing 37, and top shell 36 is close
Envelope, is welded with position adjustable board 27, and be provided with the insert port of laser liquid-level analyzer 24, the insert port 32 of mozzle 1, vacuum tube 4, installation thereon
The branch chamber observation window 5 of high temp glass；Wherein branch chamber observation window 5 is located at the two ends of top shell 36 and is close at the upper end of housing 37, quantity
It is 2；The upper end of housing 37 is provided with the crystallizer observation window 9 for installing high temp glass, and quantity is 2；Lift equipped with metal on high temp glass
Ring 25, is sealed between high temp glass and observation window using micarex；And A, B, C face in upper storehouse 3 are smooth, to ensure to divide
The sealing when high temp glass and shunting disk of stream chamber observation window 5 and crystallizer observation window 9 are installed, as shown in Figure 3；The upper storehouse 3
It is made up of A3 steel plates.
The lower storehouse 15 includes square casing 44 and lower along 45, and the upper end of square casing 44 is provided with rectangular seal groove 42, built-in
Graphite packing, storehouse 15 and lower storehouse 3 are tightly connected in realization, lower bore 4 holes along 45, for the connection and sealing of crystallizer 18；
Square casing 45 is grown and is provided with protective gas pipe 12 to wall, and transverse wall both sides are provided with thermocouple insert port 41, and the setting of insert port is with 2
With crystallizer center line as axial symmetry and 40~80mm of head distance crystallizer wall is defined after the insertion of thermocouple, lower storehouse 15 is used for
Storehouse 3 in support, and apply protective gas, prevent melt oxidation；And the D faces and E faces in lower storehouse will ensure straight, with guarantee
Sealing when storehouse is assembled with crystallizer and upper storehouse, as shown in Figure 5；The lower storehouse is made up of A3 steel plates.
The section of the shunting disk 17 is rectangular, and its upper end and upper storehouse 3 are realized sealing and fixed by micarex and bolt 53,
Bottom is provided with 2 conduits with circular hole 52,51,2 catheter center's lines should be on the center line in The ingot casting thickness direction, and distance is
The 60~80% of ingot casting width, catheter length is 50mm；And the F faces of shunting disk will keep straight, to ensure to be assembled with upper storehouse
When sealing, as shown in Figure 7；The shunting disk 17 is made by 304 stainless sheet steels, and thickness is 1~2mm, for liquid magnesium alloy
Purification and shunting；
The cloth flows through underface of the filter disc 20 loaded on the conduit 51 of shunting disk 17, and Fig. 9 and 10 gives cloth and flows through filter disc
Structure chart and top view, wherein 61, upper ring, 62, stainless steel cloth, 63, plumb post, 64, base plate, 65, breach；Cloth flows through filter
Disk 20 is cylindrical structure, including base plate 64, the stainless steel cloth 62, the vertical branch of firm stainless steel cloth that are welded on base plate
Post 63 and the upper ring 61 of fixed steel wire upper end, the wherein mesh number of stainless steel cloth 62 are 80 mesh；Plumb post 63 is welded on
Stainless steel wire is online, and quantity is 4, and the distance of neighboring vertical pillar is 1/4 circular arc；Cloth flows through filter disc 20 with shunting disk 17 by wearing
Enter the steel wire connection of filtering table breach 65 and shunting disk conduit circular hole 52,2 cloth flow through filter disc center line to upper storehouse center line
Apart from equal, cloth flow through filter disc 20 for will in magnesium alloy fused mass horizontal distribution to crystallizer 18, filter from Shang Cang flow into it is molten
The field trash remained in body, and reduce impact of the melt flowed into from upper storehouse to melt in crystallizer.
Water tank 30 is welded with the crystallizer 18, crystallizer lower edge is uniformly distributed hole for water spraying 31, and water tank material is stainless
Steel, water elder generation cooler crystallizer, is then sprayed onto in the solidified shell of ingot casting from hole for water spraying during water flowing, realizes quick Quench, crystallizer
It is made up of aluminium alloy.
Gasket material between the high temp glass and observation window, between shunting disk and upper storehouse is micarex, lower storehouse and
Gasket material between crystallizer is silicic acid aluminium paper.
The method that magnesium alloy slab DC castings are carried out using described device, is comprised the following steps that：
(1) cloth is first flowed through into filter disc and shunting disk conduit lower end, and lower storehouse and crystallizer is attached to by sealing by steel wire
Pad and fastener are assembled；The shunting disk that will be assembled is assembled with upper storehouse by sealing gasket and fastener；It is upper by what is assembled
Storehouse is placed on lower storehouse, adjusts adjustment bolt, Shang Cang is overlapped with the center line in lower storehouse；Insertion thermocouple, laser liquid-level analyzer,
Mozzle；The position of dummy ingot block is adjusted, makes to be moved in crystallizer on dummy ingot block；
(2) upper storehouse is vacuumized, controls vacuum for 0.01~0.05MPa, be 700 DEG C by the temperature after melting, purification
AZ80 magnesium alloy fused mass filter disc is flowed through into crystallizer through shunting disk, cloth by mozzle, treat that magnesium alloy liquid level rises to
Shunting disk height 2/3 when, adjustment vacuum maintains liquid level stabilizing height herein, and downward storehouse is passed through protection gas, protects atmospheric pressure
It is 0.1Mpa, is passed through cooling water, start casting machine, dummy ingot block is moved down, start casting, and adjust adjustment bolt, moves left and right
Storehouse and the position of shunting disk, to keep two temperature difference of thermocouple to be less than 2 DEG C；
(3) cast ingot dimension is thickness 300mm × 1000mm wide × 5000mm long, control casting speed 70mm/ as requested
Min, when ingot casting is close to predetermined length, stopping feeds melt；When the melt flow in upper storehouse is net, stop vacuumizing；Ingot casting
When 1/2 height of crystallizer is down in upper surface, stops casting machine and stopping is passed through cooling water；After after ingot casting all solidification, stop
Protective gas is passed through, casting machine is started, ingot casting departs from crystallizer, and casting terminates；
(4) after casting terminates, upper and lower storehouse is dismantled, disk to be shunted is cooled to room temperature, according to the assembling process of step (1)
Take each part apart, and clear up cloth and flow through filter disc.
In casting process, if there is flue gas in crystallizer, the high temp glass on upper storehouse observation window can be carried open, treat flue gas
Put back to after disappearance.
The AZ80 magnesium alloy ingot flawlesses of preparation, without cold shut, bright and clean, ingot casting is mingled with after ultrasonic inspection and reaches A on surface
Level, inside ingot even tissue, average grain size is 200 μm, and alloying element gross segregation rate is 8%.
Embodiment 2
A kind of device of magnesium alloy slab DC casting, apparatus structure is with embodiment 1, distinctive points：Catheter length is
60mm, the mesh number that cloth flows through filter disc stainless steel cloth is 50 mesh；The fastener for being used is stud.
The method that magnesium alloy slab DC castings are carried out using described device, is comprised the following steps that：
(1) cloth is first flowed through into filter disc and shunting disk conduit lower end, and lower storehouse and crystallizer is attached to by sealing by steel wire
Pad and fastener are assembled；The shunting disk that will be assembled is assembled with upper storehouse by sealing gasket and fastener；It is upper by what is assembled
Storehouse is placed on lower storehouse, adjusts adjustment bolt, Shang Cang is overlapped with the center line in lower storehouse；Insertion thermocouple, laser liquid-level analyzer,
Mozzle；The position of dummy ingot block is adjusted, makes to be moved in crystallizer on dummy ingot block；
(2) upper storehouse is vacuumized, controls vacuum for 0.01~0.05MPa, be 720 DEG C by the temperature after melting, purification
AZ31 magnesium alloy fused mass filter disc is flowed through into crystallizer through shunting disk, cloth by mozzle, treat that magnesium alloy liquid level rises to
Shunting disk height 2/3 when, adjustment vacuum maintains liquid level stabilizing height herein, and downward storehouse is passed through protection gas, protects atmospheric pressure
It is 0.1Mpa, is passed through cooling water, start casting machine, dummy ingot block is moved down, start casting, and adjust adjustment bolt, moves left and right
Storehouse and the position of shunting disk, to keep two temperature difference of thermocouple to be less than 2 DEG C；
(3) cast ingot dimension is thickness 400mm × 1400mm wide × 3000mm long, control casting speed 50mm/ as requested
Min, when ingot casting is close to predetermined length, stopping feeds melt；When the melt flow in upper storehouse is net, stop vacuumizing；Ingot casting
When 1/2 height of crystallizer is down in upper surface, stops casting machine and stopping is passed through cooling water；After after ingot casting all solidification, stop
Protective gas is passed through, casting machine is started, ingot casting departs from crystallizer, and casting terminates；
(4) after casting terminates, upper and lower storehouse is dismantled, disk to be shunted is cooled to room temperature, according to the assembling process of step (1)
Take each part apart, and clear up cloth and flow through filter disc.
In casting process, if there is flue gas in crystallizer, the high temp glass on upper storehouse observation window can be carried open, treat flue gas
Put back to after disappearance.
The AZ31 magnesium alloy ingot flawlesses of preparation, without cold shut, bright and clean, ingot casting is mingled with after ultrasonic inspection and reaches A on surface
Level, inside ingot even tissue, average grain size is 500 μm, and alloying element gross segregation rate is 9%.
Claims (10)
1. the device that a kind of magnesium alloy slab DC casts, it is characterised in that including level gauging system, cloth streaming system and casting system
System, level gauging system includes laser liquid-level analyzer, metal case and feeler lever；Cloth streaming system includes mozzle, Shang Cang, lower storehouse
And shunting disk；Casting system includes crystallizer and dummy ingot block；
In metal case, laser liquid-level analyzer and feeler lever are by imbedding the wire phase in feeler lever for laser liquid-level analyzer
Even, feeler lever is inserted in upper storehouse chamber from upper silo roof shell by crystallizer edge, and the distance away from ingot casting longitudinal centre line is The ingot casting thickness
1/3~1/4, feeler lever enter upper storehouse depth be 10~30mm；Mozzle is inserted by the mozzle insert port that upper silo roof shell is set
Enter in upper storehouse chamber, away from 20~30mm of shunting tray bottom；Lower storehouse is seated in crystallizer top, and its top maintains an equal level with upper orlop portion,
Xia Cang upper ends are connected with upper storehouse by adding the seal groove of graphite packing, and lower storehouse is fixed, and position adjustable board is welded with the top shell in upper storehouse, are adjusted
Position plate is equipped with adjustment bolt, and upper storehouse can move left and right 10~20mm by adjustment bolt；Crystallizer is located at immediately below lower storehouse, both
Fit sealing is realized by the fastener and sealing gasket that are arranged on lower orlop portion；By in shunting disk and crystallizer chamber in upper storehouse chamber
Communicate；Crystallizer is arranged right below dummy ingot block, and dummy ingot block is fixed on the mobile platform of casting machine, and mobile platform can be according to
Predetermined speed vertical downward movement.
2. the device that a kind of magnesium alloy slab DC according to claim 1 casts, it is characterised in that the upper storehouse includes top
Shell, housing and cloth flow through filter disc；Top shell is protruded than housing, top shell sealing, position adjustable board is welded with thereon, and be provided with laser liquid-level measure
Instrument insert port, mozzle insert port, vacuum tube, the branch chamber observation window of installation high temp glass；Wherein branch chamber observation window is located at
At housing upper end, quantity is 2 at top shell two ends；Housing upper end is provided with the crystallizer observation window for installing high temp glass, and quantity is
2；Metal standing ring is housed on high temp glass, is sealed using sealing gasket between high temp glass and observation window；The upper storehouse by
A3 steel plates are made.
3. the device that a kind of magnesium alloy slab DC according to claim 2 casts, it is characterised in that the cloth flows through filter disc
Underface loaded on shunting disk conduit, is cylindrical structure, including base plate, the stainless steel cloth being welded on base plate, it is firm not
Become rusty the plumb post of steel wire and the upper ring of fixed steel wire upper end, and the wherein size of stainless steel cloth is determined according to ingot casting size
Fixed, mesh number is 20~100 mesh；Plumb post is welded on stainless steel wire on the net, and quantity is 4, and the distance of neighboring vertical pillar is 1/4
Circular arc；Cloth flows through filter disc and is connected by penetrating the steel wire of filtering table mesh and shunting disk conduit circular hole with shunting disk, and 2 cloth flow through
The distance of filter disc center line to upper storehouse center line is equal.
4. the device that a kind of magnesium alloy slab DC according to claim 1 casts, it is characterised in that the lower storehouse includes side
Shape housing and lower edge, square casing upper end are provided with rectangular seal groove, and built-in graphite packing realizes that Shang Cang connects with the sealing in lower storehouse
Connect, lower edge bore 4 holes, for crystallizer connection and sealing；Square casing is long to be provided with protective gas pipe, transverse wall both sides to wall
Be provided with thermocouple insert port, the setting of insert port with after 2 thermocouples insertions with crystallizer center line as axial symmetry and head away from
It is defined from 40~80mm of crystallizer wall；The lower storehouse is made up of A3 steel plates.
5. the device that a kind of magnesium alloy slab DC according to claim 1 casts, it is characterised in that the shunting disk section
Rectangular, sealing is realized and fixes that bottom is provided with 2 conduits with circular hole, 2 in its upper end and upper storehouse by sealing gasket and fastener
Root catheter center line should be on the center line in The ingot casting thickness direction, and distance is the 60~80% of ingot casting width, and catheter length is
50~80mm, shunting disk is made by 304 stainless sheet steels, and thickness is 1~2mm.
6. the device that a kind of magnesium alloy slab DC according to claim 1 casts, it is characterised in that weldering in the crystallizer
Water tank is connected to, crystallizer lower edge is uniformly distributed hole for water spraying, and water tank material is stainless steel, and crystallizer is made up of aluminium alloy.
7. the device that a kind of magnesium alloy slab DC according to claim 1,2 or 5 casts, it is characterised in that the sealing gasket
It is made up of heat-resistant seal material.
8. the device of a kind of magnesium alloy slab DC casting according to claim 1 or 5, it is characterised in that the fastener is
Bolt, rivet, nut, screw or stud.
9. the method that the device for being cast using a kind of magnesium alloy slab DC described in claim 1 is cast, it is characterised in that
Carried out according to following processing step：
(1) cloth is first flowed through into filter disc and shunting disk conduit lower end is attached to by steel wire, and lower storehouse and crystallizer by sealing gasket and
Fastener is assembled；The shunting disk that will be assembled is assembled with upper storehouse by sealing gasket and fastener；Put in the upper storehouse that will be assembled
On lower storehouse, adjustment bolt is adjusted, Shang Cang is overlapped with the center line in lower storehouse；Insertion thermocouple, laser liquid-level analyzer, water conservancy diversion
Pipe；The position of dummy ingot block is adjusted, makes to be moved in crystallizer on dummy ingot block；
(2) upper storehouse is vacuumized, controls vacuum for 0.01~0.05MPa, be 680~750 °C by the temperature after melting, purification
Magnesium alloy fused mass filter disc is flowed through into crystallizer through shunting disk, cloth by mozzle, treat that magnesium alloy liquid level rises to shunting
Disk height 2/3 when, adjustment vacuum maintains liquid level stabilizing height herein, and downward storehouse is passed through protection gas, and protection atmospheric pressure is
0.1Mpa, is passed through cooling water, starts casting machine, and dummy ingot block is moved down, and starts casting, and adjusts adjustment bolt, moves left and right storehouse
With the position of shunting disk, with keep two temperature difference of thermocouple be less than 2 DEG C；
(3) kind and cast ingot dimension control casting speed according to magnesium alloy, when ingot casting is close to predetermined length, stopping feeds molten
Body；When the melt flow in upper storehouse is net, stop vacuumizing；When 1/2 height of crystallizer is down in the upper surface of ingot casting, stop casting
Machine and stopping are passed through cooling water；After after ingot casting all solidification, stopping is passed through protective gas, starts casting machine, and ingot casting departs from crystallization
Device, casting terminates；
(4) after casting terminates, upper and lower storehouse is dismantled, disk to be shunted is cooled to room temperature, and the assembling process according to step (1) is taken apart
Each part, and clear up cloth and flow through filter disc.
10. the method that the device of use magnesium alloy slab DC castings according to claim 9 is cast, it is characterised in that
The protective gas of the step (2) is argon gas.
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| CN108405821B (en) * | 2018-04-03 | 2019-09-03 | 东北大学 | The casting device and method of the big specification magnesium alloy slab ingot of flawless |
| CN109261914B (en) * | 2018-11-05 | 2020-11-06 | 东北大学 | Device and method for hot-top continuous casting of aluminum-lithium alloy |
| CN110238356B (en) * | 2019-07-10 | 2020-10-23 | 东北大学 | Melt pouring device and method for aluminum-lithium alloy DC casting |
| CN112517864A (en) * | 2020-08-26 | 2021-03-19 | 陕西绥德臻梦镁合金材料有限公司 | DC casting double-flow pouring method and device for large-size magnesium alloy plate blank |
| CN113857446B (en) * | 2021-09-28 | 2023-07-21 | 张明 | Metal casting and rolling method and equipment for crystallizer melt distribution and heat exchange separation |
| CN114727531B (en) * | 2022-04-29 | 2024-02-27 | 江苏华能节能科技有限公司 | Manufacturing method of silicon-aluminum alloy packaging box body |
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