CN105665669A - Preparation device and method for aluminum alloy composite pipe base - Google Patents
Preparation device and method for aluminum alloy composite pipe base Download PDFInfo
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- CN105665669A CN105665669A CN201610206273.0A CN201610206273A CN105665669A CN 105665669 A CN105665669 A CN 105665669A CN 201610206273 A CN201610206273 A CN 201610206273A CN 105665669 A CN105665669 A CN 105665669A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
- B22D11/141—Plants for continuous casting for vertical casting
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Abstract
The invention relates to a preparation device and method for an aluminum alloy composite pipe base, belonging to the technical field of metal material preparation. The device comprises an outer crystallizer, an inner crystallizer, a core mold, a support, a dummy ingot and a casting machine. The preparation method comprises the steps (1) a core material melt flows to an inner cavity when the water pressure and oil pressure in the outer crystallizer, the inner crystallizer and the core mold are stable; (2) a composite layer melt flows to an outer cavity through a splitting plate of the outer crystallizer when a core material solidification shell is formed in an outer layer, and the casting machine is started; and (3) the composite pipe base is prepared when the composite layer melt and the core material solidification shell form a composite interface, and flow supply is stopped when the composite pipe base reaches a preset length. By adopting the preparation device and method, the problems of nonuniform distribution of interface circumferential temperature and excessive and insufficient compounding are solved, the segregation and clustering phenomena are eliminated, the friction force between the core material solidification shell and the core mold is reduced, and direct composite casting forming is realized; and the device and method are simple in equipment, short in process, low in energy consumption and high in production efficiency.
Description
Technical field
The invention belongs to technical field of metal material preparation, in particular to preparation facilities and the method for a kind of aluminum alloy composite pipe base.
Background technology
The stratified composite that aluminium alloy compound tubing is two or more aluminium alloy compound a kind of and becomes, the feature of unit is respectively organized owing to multiple-unit tube can be given full play to, so matrix material can realize the combination of multiple performance, as high-strength wearable, high strength anti-corrosion, high-strength can soldering, high-strength highly-conductive, anti-corrosion can soldering etc. So the application quantity of aluminium alloy compound tubing significantly increases. Extensively for automobile, boats and ships, machinery, petrochemical complex, power electronics and space flight, aircraft industry.
The production method of traditional aluminium alloy compound tubing is extrusion cladding method, and the method is the pipe base that will be squeezed into, and after surface treatment, is set to together, extrudes after heating, utilizes high temperature when extruding, high pressure, two or more aluminium alloy compound are become composite pipe. The problem of this kind of method is that compound working procedure is long, and often there is pore at the interface of multiple-unit tube and is mingled with, and compound interface is not straight. So it is uneconomical.
In addition, also there is people by table material aluminum alloy strip, outside to core aluminium alloy pipe through the coated material of bend tension, then high frequency weldering is adopted table material to be welded into pipe, the composite pipe that this kind of method is produced, owing to table material and core do not have metallurgical binding, so not being real composite pipe, just coated tubing.
The production method of modern composite pipe is all first cast composite pipe blank, then extrudes or is rolled into composite pipe.
The method of manufacture bimetal clad pipe blank mainly contains: centrifugation technique method, disappearance mould vacuum suction casting technique and plastic process etc. Centrifugal casting is that the metal liquid being used as base pipe is first put into the metal pattern of rotation, making it be subject to rotating the centrifuge field caused, condensation becomes base pipe, when temperature decrease is to a certain degree by the time, add the metal liquid of internal lining pipe, form internal lining pipe with same principle. Due to its forming principle, it is only applicable to multiple-unit tube shaping of inner liner metal fusing point lower than outer layer metal fusing point, and this kind of method production efficiency is low, cost height. Disappearance mould vacuum suction casting technique essence is sand mold casting, using one tubing as outer tube, foam materials is as the mold of lining pipe, put into sand mold together, pour into another kind of material substitution foam, although this kind of method can do the bimetal tubing of special shape, but complex procedures, labour intensity height, it is difficult to realize suitability for industrialized production. The combination of the composite pipe that plastic process obtains is mechanical bond, it is difficult to ensure interface quality and bonding strength.
Patent 200610112817 (patent document 1) proposes the horizontal casting straight forming equipment and process of a kind of matrix material, its technique is: composite-layer metal is incubated by composite-layer metal temperature control crucible, after flowing through composite-layer metal incubation cavity, inject the casting mold formed by composite-layer metal crystallizer and core metal liquid gate spool and it is frozen into composite-layer metal pipe;Core metal is solidified in the composite-layer metal pipe solidified, and forms composite ingot with composite-layer metal pipe; Composite ingot is drawn continuously by traction mechanism after secondary cooling apparatus cools, and is sawed disconnected after reaching certain length by saw cutting device. Although the method has relative to traditional method, equipment is simple, short route, energy-conservation advantage, but also there is obvious weak point, and such as the method is only suitable for producing the composite ingot of outer layer metal fusing point higher than inner layer metal, otherwise then cannot be suitable for; Inner layer metal liquid also needs to add attemperator after flowing out, and consumes a large amount of energy; And the method can only produce composite bar, if producing composite pipe also need follow-up a series of processing, which adds operation and cost.
Patent 201010587350 (patent document 2) proposes casting device and the castmethod of a kind of composite pipe blank, and this method technological process and equipment are all fairly simple, are easy to realize large scale continuous prod, reduce the production cost of composite pipe blank. But the method outer sphere molten metal to be subject to the second-heating of inner layer metal liquid in casting process so that the difficult control of temperature of composite-layer metal and core metal compound tense, it is easy to cause the excessive compound of internal layer and outer layer metal, even mixed flow. Meanwhile, in castingprocesses, the cooled and solidified of inner layer metal liquid is wanted dispersed heat mainly by the transmission of outer layer metal, is difficult to the intensity of controlled cooling model, easily causes the excessive compound of interior outer layer metal in actually operating.
Patent 201210021134 (patent document 3) proposes preparation method and the device of a kind of bimetal plied timber, and the method equipment is simple, short route, energy consumption are low, production efficiency height, and is possible to prevent interior outer field excessive compound. But also there is obvious deficiency in the method, first the device in the method has the independent refrigerating unit of two covers, and the cooling of inner layer metal is difficult to reach perfect condition, cooling deficiency easily makes inner layer metal water fashionable remelting at outer layer metal, even melt and wear, during undercooling, then to water fashionable interface temperature too low and make it ftracture in later stage process of cooling for outer layer metal; Secondly, device structure is comparatively complicated, is unfavorable for realizing scale operation.
The method preparing composite pipe blank that patent 201010587350 (patent document 2) and patent 201210021134 (patent document 3) relate to all belongs to horizontal continuous-casting method, due to the feature of horizontal continuous-casting method, both are made to there is the bigger limitation in alloy species, tube blank size etc. when preparing composite pipe blank. First, when watering the inner layer metal tube-surface solidified when outer sphere molten metal, the interface being positioned at cast gate place, top is easily destroyed because of washing away of outer sphere molten metal, and even whole inner tube is fused. And away from below cast gate, can because cooling effect and inevitable heat scatter and disappear, can make like this outer sphere molten metal also underfill exocoel time just solidify, the alloy that particularly two-phase region is wider, when not solidifying completely, mobility has become very poor or has substantially lost mobility. Secondly, due to action of gravity, the method extremely easily produces component segregation, particularly for large-sized composite pipe blank. In addition, in these two kinds of methods, the cooling apparatus cooling intensity of device is less, is easy to cause segregation and the segregation of primary phase for hypereutectic alloy.
Producing in composite pipe blank DC castingprocesses the main problem existed is that the melt flow of core and table material circumference is uneven, causes the temperature distributing disproportionation of circumference, makes tubing compound interface not straight, or cause core to burn, castingprocesses failure;Next is embraced core at multiple-unit tube inwall and draws leakage. When composite ingot is extracted crystallizer, after its internal surface contact secondary cooling water, quick solidification shrinks, or tightly embraces core, makes ingot casting can not be drawn out crystallizer, otherwise the solidified shell that formed of the ingot casting internal surface frictional force bigger with core generation and be pulled off. The former makes castingprocesses not proceed, and this problem mainly occurs in the bigger alloy of solidification shrinkage (such as 2XXX system, 7XXX line aluminium alloy); The latter can cause the aluminium liquid in interior crystallizer molten bath to be revealed, and this problem mostly occurs at the less alloy (such as aluminum silicon alloy) of solidification shrinkage. These two major issues are all cause creating bigger frictional force between ingot casting and core due to core alloy solidification shrinkage.
Summary of the invention
For prior art Problems existing, the present invention provides a kind of preparation facilities and the method for aluminum alloy composite pipe base, this device adopts ring-type multithread shunting disk, and table material alloy liquid, when completely cutting off with air, contacts core solidified shell, and the core without secondary cooling water, successfully solving prior art Problems existing, the method is a kind of production alloy composite pipe material DC castmethod, and operation is few, productivity height, can obtain the composite pipe blank of high metallurgical quality.
The preparation facilities of the aluminum alloy composite pipe base of the present invention, comprises outer crystallizer, interior crystallizer, core, support, draws ingot and casting machine; Wherein interior crystallizer is positioned at inside outer crystallizer, outside directly over crystallizer and with one heart; Core is concentric with interior crystallizer, and through the center of interior crystallizer and outer crystallizer; Support is fixed on outer crystallizer water chamber, draws ingot and is arranged on core bottom, draws ingot and be connected with casting machine;
Described outer crystallizer, comprise outer crystallizer graphite annulus inner sleeve, water-cooling aluminum cover, water chamber and outer crystallizer heat top, water-cooling aluminum cover is arranged on water chamber, outer crystallizer graphite annulus inner sleeve is embedded in water-cooling aluminum cover, the water-cooling aluminum cover lower end of inwall is provided with and with vertical direction be two groups of 45 ° and 60 ° and cool hydrophthalmias, outer crystallizer heat top is fixed on above water-cooling aluminum cover and outer crystallizer graphite annulus inner sleeve, is made up of outer crystallizer liquid-storing box and outer crystallizer shunting disk;
Described interior crystallizer, comprise interior crystallizer graphite annulus inner sleeve, water-cooled copper cover and interior crystallizer heat top, interior crystallizer graphite annulus inner sleeve is embedded in water-cooled copper cover, interior crystallizer heat top is in back taper, it is fixed in interior crystallizer, puts in interior crystallizer graphite annulus, be made up of interior crystallizer liquid-storing box and interior crystallizer shunting disk;
Described core, comprises cooling system, oiling system and core heat top; Cooling system includes water pipe, rising pipe, interconnecting device, core water chamber, water channel and water-cooled copper film, and wherein, inhalent siphon is connected core water chamber through water-cooled copper film, and core water chamber connects logical interconnecting device by water channel, and interconnecting device is connected rising pipe; Oiling system includes oil pipe, oil chamber, oil lid and oilhole, wherein, enters oil pipe and is connected to oil chamber, oil chamber is provided with oil lid, and oil is provided with oilhole in chamber; Core heat top is positioned at above the oily chamber of oiling system and is in contact with it;
Described support, is connected with outer crystallizer, interior crystallizer and core, for supporting outer crystallizer, interior crystallizer and core;
Described ingot-guiding head, in trapezoidal, forms exocoel with the graphite annulus inner sleeve of outer crystallizer, forms inner chamber with the graphite annulus inner sleeve of interior crystallizer.
Wherein:
Described outer crystallizer shunting disk comprises 3 layers of flow dividing structure, and outermost layer is provided with 1 inflow port, and secondary skin is provided with 2～3 shunting mouths, and internal layer is provided with 4～6 shunting mouths;Shunting mouth is provided with block; Outer crystallizer shunting disk is provided with the tap hole leading to outer crystallizer graphite annulus inner sleeve;
Described interior crystallizer shunting disk comprises 3 layers of flow dividing structure, and outermost layer is provided with 1 inflow port, and secondary skin is provided with 2～3 shunting mouths, and internal layer is provided with 4～6 shunting mouths; Shunting mouth is provided with block; Interior crystallizer shunting disk is provided with the tap hole leading to interior crystallizer graphite annulus inner sleeve;
Described outer crystallizer liquid-storing box and interior crystallizer liquid-storing box are made up of lagging material;
Described core heat top is made up of lagging material.
Adopting the preparation facilities of above-mentioned aluminum alloy composite pipe base, the method preparing aluminum alloy composite pipe base is, core alloy liquid flows into through table material heat top shunting disk, contacts with interior crystallizer internal surface, forms thin solidified shell. Table material alloy liquid flows into through the bottom of interior crystallizer, contacts with core solidified shell, wetting, and part Hui Rong, under the secondary cooling water of crystallizer cools outside, solidifies, and forms composite pipe. This kind of decoration form can ensure solidified shell that core formed not with air contact, avoid oxidation and gas entrains into, it is ensured that compound interface is without pore and oxide inclusion, thus ensure that the metallurgical binding of compound interface.
Specifically comprise the steps:
Step 1:
(1) by outer crystallizer, interior crystallizer and core water flowing, the logical oil of core; Core melt is injected interior crystallizer liquid-storing box; Composite bed melt is injected outer crystallizer liquid-storing box;
(2) when hydraulic pressure and oil pressure are stablized, make core melt by interior crystallizer shunting disk, flow in inner chamber;
Step 2:
(1) when core melt, under the cooling of interior crystallizer graphite inner sleeve, core water-cooled copper cover and ingot-guiding head, during outer formation core solidified shell, opening outer crystallizer liquid-storing box, composite bed melt flows into exocoel by outer crystallizer shunting disk;
(2) when composite bed melt contacts with ingot-guiding head, casting machine is started;
Step 3: composite casting:
(1) composite bed melt contacts with core solidified shell, forms the compound interface with metallurgical binding, obtained aluminum alloy composite pipe base;
(2) when aluminum alloy composite pipe base arrives predetermined length, stop for stream.
Wherein:
In described step 1 (2), melt adopts same level cast multiply mode by interior crystallizer shunting disk; When core melt enters the heat top of back taper by runner, melt circumferentially enters evenly inner chamber after being blocked by block;
In described step 2 (1), composite bed melt adopts same level cast multiply mode by outer crystallizer shunting disk; Composite bed melt, by outer crystallizer shunting disk, enters exocoel vertically after being shunted by tap hole;
In described step 3, when composite bed melt when contacting with the core solidified shell being in high temperature, will form the interface with metallurgical binding by the mutual diffusion of alloying element;
The described method preparing aluminum alloy composite pipe base, composite casting technology condition is: teeming temperature 710～760 DEG C, casting speed 50～200mm/min, outer crystallizer cooling water inflow 60～200L/min m, interior crystallizer cooling water inflow 10～30L/min m, core cooling water inflow 30～80L/min m, core oil amount 5～20ml/min; The concrete numerical value of every processing condition can be determined according to the different-alloy of the alloy composite pipe base of different size.
The preparation facilities of the aluminum alloy composite pipe base of the present invention and method, solve the problem of interface circumference temperature distributing disproportionation and excessive and deficient compound, eliminate segregation, segregation phenomenon, reduce the frictional force between core solidified shell and core, realize the direct combination cast form of composite pipe blank, propose that a kind of equipment is simple, short route, energy consumption are low, production efficiency height, make two kinds of aluminium alloys realize the equipment of composite pipe blank and the method for metallurgical binding.Compared with current technology, feature and the useful effect thereof of the present invention be:
(1) apparatus of the present invention and method is utilized to carry out composite casting, two kinds of metals can be made all to be in liquid state, directly obtain the operations such as composite pipe blank carries out extruding again, drawing, compared with the technique of traditional mode of production composite pipe blank, both be conducive to forming metallurgical diffusion layer in interface, improve the bonding strength at interface, greatly reduce operation, it is to increase production efficiency.
(2) when carrying out composite casting, in inside and outside crystallizer, the structure on heat top makes two kinds of metal melts all realize same level shunting, melt flow is more stable, and the temperature fluctuation produced is impacted at interface by basic melt flow of eliminating, and the same height in interface circumference temperature is more even; The contact position of composite bed melt and core solidified shell exists without air, can not be oxidized when core solidified shell is extracted from interior crystallizer, avoids interface to produce oxidation, be mingled with, contributes to obtaining the composite pipe blank that interface is clean, metallurgical binding is good.
(3) the copper cover outer wall of core is designed to tapering, and up big and down small structure, and oiling system makes copper mold by oil continuous lubrication, effectively reduces the frictional force between core solidified shell and core, prevents embracing core and drawing leakage phenomenon in castingprocesses.
(4) contact height by control composite bed melt and core solidified shell is 30～60mm, makes two kinds, interface aluminium alloy occur effectively to spread. Contact height is the vertical distances of two kinds of firm contact positions of alloy to graphite annulus upper limb, this segment distance is that two kinds of alloys, by diffusion, the main phase of metallurgical binding occur, contact height is excessively little, and two kinds of alloys diffusion fully also do not occur or do not occur just to be cooled to by the secondary cooling water of outer crystallizer during diffusion to solidify; When contact height is excessive, composite bed melt is excessive to the backheat effect of core solidified shell, so that excessive remelting even mixed flow occurs in interface.
(5) by control core liquid level at 50～100mm, it is in comparatively high temps when two kinds of alloys are contacted, and core surfaces is in solid-state. When two kinds of alloys contact, core solidified shell hull-skin temperature (i.e. Contact Temperature) is the key of compound success or failure and composite effect. The present invention provides a kind of novel method, controls Contact Temperature, and its control method is: control the cooling distance of core melt in interior crystallizer by the height on control interior crystallizer heat top so that it is distance is between 50～100mm. When core liquid level exceedes this scope, can not there is metallurgical binding in two kinds of alloys; When core liquid level is less than this scope, excessive remelting or mixed flow will be there is in interface.
(6) when utilizing apparatus of the present invention and method to carry out composite casting, both can select aluminium alloy that solidus curve is higher as the lower aluminium alloy of core alloy, solidus curve as composite bed alloy, aluminium alloy that solidus curve is lower can have been selected again as the higher aluminium alloy of core alloy, solidus curve as composite bed alloy. When core alloy solidus curve is lower, composite bed alloy solidus curve is higher, can suitably heighten core liquid level or strengthen the interior crystallizer water coolant water yield, when making core be extracted interior crystallizer, core solidified shell has enough thickness and intensity to support the inner melt not solidified of core, keeps out the impact of composite bed melt; When core alloy solidus curve is higher, composite bed solidus curve is lower, can suitably reduce core liquid level or reduce the interior crystallizer water coolant water yield, when making core be extracted interior crystallizer, core solidified shell outside surface has higher temperature, when such two kinds of alloys contact, alloying element can fully spread, it is achieved metallurgical binding.
(7) apparatus of the present invention and method are vertical semicontinuous composite casting, level semicontinuous composite casting segregation segregation phenomenon greatly reduces relatively, and the selection of tube blank size, compound ratio, alloy species is comparatively flexible, the design (holding structure is substantially constant) of crystallizer size can be carried out according to actual needs, optimize processing condition and produce.
Accompanying drawing explanation
The preparation facilities structural representation of the aluminum alloy composite pipe base of Fig. 1 embodiment of the present invention, wherein: (a) is front view; B () is vertical view;
The interior crystallizer heat top shunting disk structure iron of Fig. 2 embodiment of the present invention;
The outer crystallizer heat top shunting disk structure iron of Fig. 3 embodiment of the present invention;
The core mold structure figure of Fig. 4 embodiment of the present invention;
The core solidified shell schematic diagram of Fig. 5 embodiment of the present invention;
In figure: 1 outer crystallizer water inlet pipe, 2 water inlet pipes, 3 supports, 4 interior crystallizers, 5 interior crystallizer heat top shunting disks, 6 rising pipes, 7 outer crystallizer heat top shunting disks, 8, outer crystallizer, 9 casting platforms, 10 compound interfaces, 11 table material alloy liquid, 12 cores, 13 core alloy liquid, 14 composite pipes, 15 draw ingot, 51 interior crystallizer heat top shunting disk entrances, 52 interior crystallizer heat top one-level runners, 53 interior crystallizer branching blocks, the 54 three grades of runners in interior crystallizer heat top, 55 interior crystallizer stream holes, 71 outer crystallizer heat top shunting disk entrances, 72 outer crystallizer heat top shunting disk one-level chutes, 73 outer crystallizer heat top shunting disk one-level blocks, 74 outer crystallizer heat top shunting disk secondary streams grooves, 75 outer crystallizer heat top shunting disk two grades of blocks, 121 core water inlets, 122 oil pipes, 123 core heat tops, 124 core copper covers, 125 core water outlets, 126 oilholes.
Embodiment
The present invention will be described in further detail by embodiment by means of example, with reference below. It is appreciated that embodiments of the invention are for illustration of the present invention instead of limitation of the present invention. The simple modifications that the present invention is carried out by the essence according to the present invention all belongs to the scope of protection of present invention.
The preparation facilities of aluminum alloy composite pipe base, as shown in Figure 1, comprises outer crystallizer 8, interior crystallizer 4, core 12, support 3, draws ingot 15 and casting machine; Wherein interior crystallizer 4 is positioned at inside outer crystallizer 8, outside directly over crystallizer 8 and with one heart; Core 12 is concentric with interior crystallizer 4, and through the center of interior crystallizer 4 and outer crystallizer 8; Support 3 is fixed on outer crystallizer 8 water chamber, draws ingot 15 and is arranged on core 12 bottom, draws ingot 15 and be connected with casting machine;
Described outer crystallizer 8 comprises outer crystallizer graphite annulus inner sleeve, water-cooling aluminum cover, water chamber and outer crystallizer heat top, water-cooling aluminum cover is arranged on water chamber, outer crystallizer graphite annulus inner sleeve is embedded in water-cooling aluminum cover, the water-cooling aluminum cover lower end of inwall is provided with and with vertical direction be two groups of 45 ° and 60 ° and cool hydrophthalmias, outer crystallizer heat top is fixed on above water-cooling aluminum cover and outer crystallizer graphite annulus inner sleeve, is made up of outer crystallizer liquid-storing box and outer crystallizer shunting disk;
Described liquid-storing box is made up of lagging material;
Described interior crystallizer comprises interior crystallizer graphite annulus inner sleeve, water-cooled copper cover and interior crystallizer heat top, interior crystallizer graphite annulus inner sleeve is embedded in water-cooled copper cover, interior crystallizer heat top is in back taper, it is fixed in interior crystallizer, puts in interior crystallizer graphite annulus, be made up of interior crystallizer liquid-storing box and interior crystallizer shunting disk;
Described core, as shown in Figure 4, comprises cooling system, oiling system and core heat top 123;Cooling system includes water pipe 121, rising pipe, interconnecting device, core water chamber, water channel and water-cooled copper film, and wherein, inhalent siphon is connected core water chamber through water-cooled copper film, and core water chamber connects logical interconnecting device by water channel, and interconnecting device is connected rising pipe; Oiling system includes oil pipe 122, oil chamber, oil lid and oilhole 126, wherein, enters oil pipe and is connected to oil chamber, oil chamber is provided with oil lid, and oil is provided with oilhole 126 in chamber; Core heat top 123 is positioned at above the oily chamber of oiling system and is in contact with it;
Described support 3, is connected with outer crystallizer 8, interior crystallizer 4 and core 12, for supporting outer crystallizer 8, interior crystallizer 4 and core 12;
Described ingot-guiding head, in trapezoidal, forms exocoel with the graphite annulus inner sleeve of outer crystallizer, forms inner chamber with the graphite annulus inner sleeve of interior crystallizer;
Wherein:
Described interior crystallizer shunting disk comprises 3 layers of flow dividing structure, and as shown in Figure 2, outermost layer is provided with 1 inflow port, and secondary skin is provided with 2 shunting mouths, and internal layer is provided with 4 shunting mouths; Shunting mouth is provided with block; Interior crystallizer shunting disk is provided with the tap hole leading to interior crystallizer graphite annulus inner sleeve;
Described outer crystallizer shunting disk comprises 3 layers of flow dividing structure, and as shown in Figure 3, outermost layer is provided with 1 inflow port, and secondary skin is provided with 2 shunting mouths, and internal layer is provided with 4 shunting mouths; Shunting mouth is provided with block; Outer crystallizer shunting disk is provided with the tap hole leading to outer crystallizer graphite annulus inner sleeve;
Described liquid-storing box is made up of lagging material;
Described core heat top is made up of lagging material.
Adopt the preparation facilities of above-mentioned aluminum alloy composite pipe base, prepare the method for aluminum alloy composite pipe base, specifically comprise the steps:
Get the raw materials ready: the melting of aluminium alloy
With two resistance furnace meltings, two kinds of aluminium alloys respectively, and as the molten metal of composite bed and core, refining, degasification, take off slag after leave standstill 20 minutes, heat preservation for standby use.
Step 1:
(1) by outer crystallizer, interior crystallizer and core water flowing, the logical oil of core; Core melt is injected interior crystallizer liquid-storing box; Composite bed melt is injected outer crystallizer liquid-storing box;
(2) when hydraulic pressure and oil pressure are stablized, make core melt 13 by interior crystallizer shunting disk 5, flow in inner chamber; Wherein, melt 13 adopts same level cast multiply mode by interior crystallizer shunting disk; When core melt enters the heat top of back taper by runner, melt circumferentially evenly enters ground inner chamber after being blocked by block;
Step 2:
(1) when core melt, under the cooling of interior crystallizer graphite inner sleeve, core water-cooled copper cover and ingot-guiding head, during outer formation core solidified shell A, opening outer crystallizer liquid-storing box, composite bed melt 11 flows into exocoel by outer crystallizer shunting disk 7; Wherein, composite bed melt 11 adopts same level cast multiply mode by outer crystallizer shunting disk; Composite bed melt, by outer crystallizer shunting disk, enters exocoel vertically after being shunted by tap hole;
(2) when composite bed melt contacts with ingot-guiding head, casting machine is started;
Step 3: composite casting:
(1) composite bed melt contacts with core solidified shell, when composite bed melt is by when contacting with the core solidified shell being in high temperature, the latter is had backheat effect by the former, make between the two at this moment between keep comparatively high temps in section, formed the compound interface with metallurgical binding by the mutual diffusion of alloying element, the secondary cooling water of outer crystallizer 8 waters its surface, and table material alloy liquid 11 and core alloy liquid 13 cool rapidly, solidify, obtained composite pipe blank;
(2) when composite pipe blank arrives predetermined length, stop for stream; Then close water coolant, suspend casting machine, prepare to pour into a mould next time.
The method preparing aluminum alloy composite pipe base of the present embodiment, core solidified shell schematic diagram, as shown in Figure 5; Composite casting technology condition is: teeming temperature 710 DEG C, casting speed 100mm/min, outer crystallizer cooling water inflow 100/min m, interior crystallizer cooling water inflow 20L/min m, core cooling water inflow 50L/min m, core oil amount 10ml/min.
Cut cross section and vertical section sample in composite pipe blank process stabilizing section, observe macroscopic view and microtexture, energy spectrum analysis research circle surface element spread condition by after its polishing, corrosion. Intercept processing sample again, test its mechanical property.
The embodiment of the present invention devises core heat top shunting disk 5 and table material heat top shunting disk 7, it is ensured that managing each portion alloy aluminum liquid and be evenly distributed, when especially table material thickness is less, composite bed is even. Have employed the copper of the hot top cover of band and oil lubrication cover core 12, it is ensured that when hole is less in composite pipe blank, prevent the leakage aluminium in multiple-unit tube castingprocesses, embrace the accidents such as fuse simultaneously. Adopting the method cast aluminium alloy composite pipe generation that can avoid interface pore, be mingled with of the present invention, interface is straight, stable, it is achieved good metallurgical binding.
Claims (7)
1. the preparation facilities of an aluminum alloy composite pipe base, it is characterised in that, comprise outer crystallizer, interior crystallizer, core, support, draw ingot and casting machine; Wherein interior crystallizer is positioned at inside outer crystallizer, outside directly over crystallizer and with one heart; Core is concentric with interior crystallizer, and through the center of interior crystallizer and outer crystallizer; Support is fixed on outer crystallizer water chamber, draws ingot and is arranged on core bottom, draws ingot and be connected with casting machine;
Described outer crystallizer, comprise outer crystallizer graphite annulus inner sleeve, water-cooling aluminum cover, water chamber and outer crystallizer heat top, water-cooling aluminum cover is arranged on water chamber, outer crystallizer graphite annulus inner sleeve is embedded in water-cooling aluminum cover, the water-cooling aluminum cover lower end of inwall is provided with and with vertical direction be two groups of 45 ° and 60 ° and cool hydrophthalmias, outer crystallizer heat top is fixed on above water-cooling aluminum cover and outer crystallizer graphite annulus inner sleeve, is made up of outer crystallizer liquid-storing box and outer crystallizer shunting disk;
Described interior crystallizer, comprise interior crystallizer graphite annulus inner sleeve, water-cooled copper cover and interior crystallizer heat top, interior crystallizer graphite annulus inner sleeve is embedded in water-cooled copper cover, interior crystallizer heat top is in back taper, it is fixed in interior crystallizer, puts in interior crystallizer graphite annulus, be made up of interior crystallizer liquid-storing box and interior crystallizer shunting disk;
Described core, comprises cooling system, oiling system and core heat top; Cooling system includes water pipe, rising pipe, interconnecting device, core water chamber, water channel and water-cooled copper film, and wherein, inhalent siphon is connected core water chamber through water-cooled copper film, and core water chamber connects logical interconnecting device by water channel, and interconnecting device is connected rising pipe; Oiling system includes oil pipe, oil chamber, oil lid and oilhole, wherein, enters oil pipe and is connected to oil chamber, oil chamber is provided with oil lid, and oil is provided with oilhole in chamber; Core heat top is positioned at above the oily chamber of oiling system and is in contact with it;
Described support, is connected with outer crystallizer, interior crystallizer and core;
Described ingot-guiding head, in trapezoidal, forms exocoel with the graphite annulus inner sleeve of outer crystallizer, forms inner chamber with the graphite annulus inner sleeve of interior crystallizer.
2. the preparation facilities of aluminum alloy composite pipe base according to claim 1, it is characterized in that, described outer crystallizer shunting disk comprises 3 layers of flow dividing structure, and outermost layer is provided with 1 inflow port, secondary skin is provided with 2～3 shunting mouths, and internal layer is provided with 4～6 shunting mouths;Shunting mouth is provided with block; Outer crystallizer shunting disk is provided with the tap hole leading to outer crystallizer graphite annulus inner sleeve.
3. the preparation facilities of aluminum alloy composite pipe base according to claim 1, it is characterized in that, described interior crystallizer shunting disk comprises 3 layers of flow dividing structure, and outermost layer is provided with 1 inflow port, secondary skin is provided with 2～3 shunting mouths, and internal layer is provided with 4～6 shunting mouths; Shunting mouth is provided with block; Interior crystallizer shunting disk is provided with the tap hole leading to interior crystallizer graphite annulus inner sleeve.
4. adopt the preparation facilities of aluminum alloy composite pipe base according to claim 1, prepare the method for alloy composite pipe base, it is characterised in that, comprise the steps:
Step 1:
(1) by outer crystallizer, interior crystallizer and core water flowing, the logical oil of core; Core melt is injected interior crystallizer liquid-storing box; Composite bed melt is injected outer crystallizer liquid-storing box;
(2) when hydraulic pressure and oil pressure are stablized, make core melt by interior crystallizer shunting disk, flow in inner chamber;
Step 2:
(1) when core melt, under the cooling of interior crystallizer graphite inner sleeve, core water-cooled copper cover and ingot-guiding head, during outer formation core solidified shell, opening outer crystallizer liquid-storing box, composite bed melt flows into exocoel by outer crystallizer shunting disk;
(2) when composite bed melt contacts with ingot-guiding head, casting machine is started;
Step 3: composite casting:
(1) composite bed melt contacts with core solidified shell, forms the compound interface with metallurgical binding, obtained aluminum alloy composite pipe base;
(2) when aluminum alloy composite pipe base arrives predetermined length, stop for stream.
5. the method preparing aluminum alloy composite pipe base according to claim 4, it is characterised in that, in described step 1 (2), melt adopts same level cast multiply mode by interior crystallizer shunting disk; When core melt enters the heat top of back taper by runner, melt circumferentially evenly enters ground inner chamber after being blocked by block.
6. the method preparing aluminum alloy composite pipe base according to claim 4, it is characterised in that, in described step 2 (1), composite bed melt adopts same level cast multiply mode by outer crystallizer shunting disk; Composite bed melt, by outer crystallizer shunting disk, enters exocoel vertically after being shunted by tap hole.
7. the method preparing aluminum alloy composite pipe base according to claim 4, it is characterized in that, the described method preparing alloy composite pipe base, composite casting technology condition is: teeming temperature 710～760 DEG C, casting speed 50～200mm/min, outer crystallizer cooling water inflow 60～200L/min m, interior crystallizer cooling water inflow 10～30L/min m, core cooling water inflow 30～80L/min m, core oil amount 5～20ml/min.
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| CN113441696A (en) * | 2021-06-09 | 2021-09-28 | 佛山市三水凤铝铝业有限公司 | Casting equipment and casting method for bimetallic pipe |
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| WO2015018543A1 (en) * | 2013-08-05 | 2015-02-12 | Refractory Intellectual Property Gmbh & Co. Kg | Refractory ceramic nozzle |
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| CN102179494A (en) * | 2011-04-21 | 2011-09-14 | 东北大学 | Continuous casting method and device for aluminum alloy compounded ingot |
| CN102416448A (en) * | 2011-11-28 | 2012-04-18 | 苏州有色金属研究院有限公司 | Split plate for casting aluminum alloy composite round ingot blank |
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