CN102909324A - Short crystallizer for casting hollow aluminum ingots - Google Patents
Short crystallizer for casting hollow aluminum ingots Download PDFInfo
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- CN102909324A CN102909324A CN2012104737376A CN201210473737A CN102909324A CN 102909324 A CN102909324 A CN 102909324A CN 2012104737376 A CN2012104737376 A CN 2012104737376A CN 201210473737 A CN201210473737 A CN 201210473737A CN 102909324 A CN102909324 A CN 102909324A
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Abstract
The invention discloses a short crystallizer for casting hollow aluminum ingots. The short crystallizer comprises a crystallizer housing, wherein a triangular support is clamped inside an annular groove of the housing and can rotate on the housing; an internal sleeve and an liner are fixedly arranged inside the housing; a core is placed inside the liner; a water inlet is formed above the core, is connected with a core water inlet pipe and is arranged on the triangular support; a water outlet and a water outlet hole are formed below the core; and an aluminum liquid inlet is formed between the core and the liner. The short crystallizer is characterized in that the core (4) is internally hollow and conical, and the height of the core is 80mm-120mm; the height of the upper part of the core (4) is 65%-70% of that of the core, and the conical degree of the upper part of the core (4) is 1: (30-50); the height of the lower part of the core (4) is 30%-35% of that of the core, and the conical degree of the lower part of the core (4) is 1: (15-17); the internal sleeve is made of aluminum alloy; and the liner is made of copper and can be pulled out from the internal sleeve to be and replaced. By shortening the length of the crystallizer, the crystal grains of the hollow ingots are relatively thin, and the surface quality of finished tubes is good; and through the improvement that the upper and lower parts of the core of the crystallizer have two different conical degrees, the remelting and cracking of crystal membranes are avoided.
Description
Technical field
The present invention relates to technical field in the aluminium processing, more specifically to a kind of short crystallizer for the cast aluminum-molykote composite material hollow ingot.
Background technology
The blank pipe mode of production of aluminum current alloy seamless aluminum pipe mainly contains three kinds: 1, solid ingot perforation hot extrusion method; 2, hollow ingot hot extrusion method; 3, thin-walled hollow ingot three roller hot rolling methods.The first solid ingot perforation extruding is main in these three kinds of modes of production is fit to the soft aluminium-alloy pipe of production, and generally is the less aluminium alloy seamless pipe of internal diameter; For intensity higher alloy pipe and large size pipe, solid ingot perforation extruding can't be produced, and accommodation is very little, generally adopts all the other two kinds of mode of production hollow ingot hot extrusion methods, thin-walled hollow ingot three roller hot rolling methods.
The aluminium alloy hollow ingot is mainly by direct casting hollow ingot with adopt the solid ingot acquisition of holing.For the larger aluminum pipe of internal diameter size, must adopt the casting hollow ingot, because the endoporus of hollow ingot is equal to the internal diameter size of blank pipe substantially, adopt solid ingot boring to produce hollow ingot, need to bore a larger endoporus, the part that boring is removed is occupied very large ratio, and major part becomes the aluminium bits, need again complexification regeneration aluminium ingot, work efficiency is low, waste is very big.
The casting hollow ingot, the hollow ingot surfaces externally and internally has fatal impact to the quality of tubing, and the casting hollow ingot is squeezed into the blank pipe through heating, and generally obtains the finished product aluminum pipe of appropriate size after the blank pipe production completion by the operation such as stretch, cold rolling.Hollow ingot requires the hollow ingot surfaces externally and internally smooth in extrusion process, organizes crystal grain fine and closely woven, and without defectives such as drawing crack, pore, slag inclusions, hollow ingot generally needed the hollow ingot of defectiveness and demanding product is carried out machining before extruding.Therefore, the casting hollow ingot is the most basic with the crucial processing step of aluminium-alloy pipe that manufactures a finished product.
The casting frock of hollow ingot is made of crystallizer shell, fuse, tripod, drawing bar etc., in the casting process, the crystallizer frock is evenly distributed on the water diversion disk outer ring, give each shell and fuse cooling water supply by water diversion disk, divide the aluminium dish to be positioned at the water diversion disk center, aluminium liquid flows into a minute aluminium dish in the stove, is assigned to each crystallizer by a minute aluminium dish again, injects the annulus that is formed by shell and fuse.
During the casting beginning, lift rises, drawing bar enters in the crystallizer annulus, open cooling water, aluminium liquid is injected by minute aluminium dish, at first is subjected to the i.e. once cooling of cooling of shell and fuse, begins to be frozen into crystalline film and is attached on the drawing bar, drawing bar descends, the hollow ingot that drives crystallization descends and also pulls out gradually crystallizer, and it is the secondary cooling that the water knot of shell and the ejection of fuse lower edge touches hollow ingot, drawing bar decline, aluminium liquid injects, by the temperature of aluminium liquid, the speed of decline, the adjusting of the size of cooling water makes whole casting process form flow equilibrium and energy balance, and forming stable solidus line in the crystallizer is the liquid cave, casting continues to carry out, and finishes a casting inferior.
In present hollow ingot foundry production, once cooling generate crystalline film because and the heating of the friction of shell and fuse, aluminium liquid, crystalline film remelting or attenuation, intensity descends, and easily causes the surfaces externally and internally drawing crack, runs flow phenomenon and often occur; In process of setting, owing to transferring solid-state appearance to, liquid state shrinks, the necessary machined surface taper of fuse, the hollow ingot of avoiding solidifying is embraced on fuse, after tapering appears in fuse, because the effect of secondary cooling, inner at crystallizer, there is from top to bottom the impact of thermograde and solidification shrinkage, interior hole dimension diminishes gradually, the fuse that adopts is single tapering, and crystallizer fuse length one regularly, and the tapering of fuse is too small, easily embraces core, tapering is excessive, to form the air-gap of one deck thermal insulation between hollow ingot and the fuse, hinder further cooling, will cause the crystalline film remelting and aluminium liquid is additional endlessly, occur leaking, the aluminium liquid that leaks is met the intermediate water cooling, forms the segregation knurl, is attached to the hollow ingot inner surface.
And casting hollow ingot crystallizer fuse, in process of setting, because most of metal at the crystallizer intercrystalline, is followed the remelting recrystallization process simultaneously, crystal grain has the sufficient time to grow up, the crystallization coarse grains, and processing characteristics is relatively poor.
In sum, casting hollow ingot crystallizer fuse length and single tapering of existing manufacturing technique requirent, the hollow ingot face crack that obtains, the segregation knurl is more, because metal is at the crystallizer intercrystalline, grain size is also relatively poor, in subsequent production, except hollow ingot is carried out machining, part needs that also the blank pipe of extruding is carried out rossing to be processed, and is difficult to satisfy the product to the structure property high requirement, consumes large, quality is difficult to control, and yield rate is low.
Summary of the invention
The objective of the invention is in order to overcome the defective of prior art existence, a kind of short crystallizer for the cast aluminum-molykote composite material hollow ingot is provided, by shortening length of mould, avoided grain growth, hollow ingot crystal grain is thinner, processing characteristics and finished product tubing excellent surface quality improve hollow ingot quality and the yield rate of producing; Be double tapered by improving the crystallizer fuse, part is divided into two taperings with the bottom on the fuse, satisfies manufacturing technique requirent, prevents crystalline film remelting and drawing crack, avoids hollow ingot face crack, segregation knurl, improves work efficiency.
Another object of the present invention provides a kind of copper aluminium graphite mold of replaceable liner, applies mechanically aluminium alloy in the copper aluminium graphite mold, and the liner red copper is convenient to more changeable liner, and high lubricating effect in the pipe casting process has guaranteed the pipe surface quality.
The technical solution used in the present invention: the short crystallizer of a kind of double tapered for the cast aluminum-molykote composite material hollow ingot, comprise the crystallizer shell, the shell water inlet pipe, tripod snaps in the cannelure of shell, and can rotate at shell, be fixed with inner sleeve and liner in the shell, fuse is placed in the liner, there is water inlet the fuse top, water inlet connects the fuse water inlet pipe, the fuse water inlet pipe is installed on the tripod, and the fuse below is provided with delivery port and apopore, and aluminium liquid entrance is arranged between fuse and the liner, mainly be that described fuse is that interior sky is coniform, be 80 ~ 120 mm highly, Partial Height is the 65-70% of fuse height on the fuse, and tapering is 1:30 ~ 50, Partial Height is the 30-35% of fuse height under the fuse, and tapering is 1:15 ~ 17.
Further technical scheme is on the technique scheme basis:
And described inner sleeve is aluminium alloy, and being provided with liner in the inner sleeve is copper material, and liner is that interference fit connects with inner sleeve, and liner can be extracted replacing out from inner sleeve.
And described inner sleeve below is provided with apopore.
Beneficial effect of the present invention is:
1, because the crystallizer of cast aluminum-molykote composite material hollow ingot of the present invention adopts the structure of improving traditional fuse, reduce the fuse height, shell also need reduce simultaneously, become short crystallizer fuse, reduce the time of meeting intermediate water, make crystallization mainly rely on the secondary cooling to carry out, avoided grain growth, hollow ingot crystal grain is thinner, processing characteristics and finished product tubing excellent surface quality.
2, the tapering owing to part on the fuse of the present invention's employing is little, the scull that forms in the contraction process and plug are in conjunction with tight, continuation is cooled off by fuse, between hollow ingot and the fuse, be not easy to form the air-gap of one deck thermal insulation, crystalline film continues cooling, crystalline film is difficult for attenuation, intensity is high, prevents crystalline film remelting and drawing crack, avoids the segregation knurl to occur; The bottom divides tapering large, and hollow ingot frictional force when breaking away from fuse is less, is convenient to hollow ingot and breaks away from crystallizer, has avoided simultaneously the appearance of drawing crack and armful core phenomenon.
3, because the hollow ingot that adopts crystallizer fuse of the present invention to produce, surfaces externally and internally is smooth, grain size is thin, properties for follow is good, the hollow ingot product can directly use, for the thin-wall pipes of having relatively high expectations, also greatly reduce the hollow ingot machining amount, save a large amount of artificial material costs and make finished product tubing have excellent performance.
4, because the present invention adopts copper aluminium graphite mold, and it adopts aluminium alloy by inner sleeve, liner adopts red copper, liner diameters is slightly larger than the inner sleeve diameter, and copper liner and aluminium inner sleeve are interference fit, adopts the hot charge practice assembling to connect, after the use, the copper liner can be extracted out from the aluminium inner sleeve and be convenient to change, and the red copper fusing point is high, and the crystallizer copper inner lining surface is that the working face self-lubricating effect is better, polish smooth, guaranteed the pipe surface quality that casts out, be convenient to frequent maintenance, increased the service life.
5, because the present invention adopts copper aluminium graphite mold, adopt the aluminium alloy inner sleeve in the crystallizer, the red copper liner, heat transfer rate is lower than full copper, the crystallization of aluminium liquid is relatively slow in the crystallizer, whole crystallizations during the secondary cooling, when aluminium liquid entrance, crystallization is less, and the section port crystallization is more under liner, cooling water at crystallizer end opening inner sleeve, fuse apopore cools off fast, form aluminium liquid cave, liquid aluminium becomes solid aluminum gradually, is particularly suitable for the thin-walled hollow pipe and forms, its good physical performance, grain structure is better.
Description of drawings
Fig. 1 is a kind of short mold structure schematic diagram for the cast aluminum-molykote composite material hollow ingot of the present invention.
Fig. 2 is a kind of short crystallizer core structures schematic diagram for the cast aluminum-molykote composite material hollow ingot of the present invention.
Fig. 3 is a kind of short crystallizer aluminium inner sleeve, copper inner lining structure schematic diagram for the cast aluminum-molykote composite material hollow ingot of the present invention.
Shell (1), shell water inlet pipe (2), tripod (3), fuse (4), fuse (4-1), fuse (4-2), fuse water inlet (5), fuse water inlet pipe (6), fuse delivery port (7), apopore (8), inner sleeve (9), liner (10), aluminium liquid entrance (11), contract piece (12), cannelure (13), drawing bar (14).
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, 2, 3, a kind of short crystallizer for the cast aluminum-molykote composite material hollow ingot, the casting frock of hollow ingot is by formations such as crystallizer shell (1), inner sleeve (7), liner (8), fuse, tripods.Crystallizer shell (1) is provided with shell water inlet pipe (2), tripod (3) snaps in the cannelure (13) of shell (1), the contract piece (12) of available tripod (3) snaps in the cannelure (13), tripod (3) can rotate at shell (1), and guarantee shell (1) and fuse (4) with one heart, be fixed with inner sleeve (9) and liner (10) in the shell (1), with bolt that inner sleeve (9) and shell (1) is fastening, liner (10) is nested with in inner sleeve (9), and liner (10) connects with inner sleeve (9) interference fit.
Fuse (4) is placed in the liner (10), fuse (4) top is provided with fuse water inlet (5), water inlet (5) is connected to fuse water inlet pipe (6), fuse water inlet pipe (5) is installed on tripod (3) top end face, fuse water inlet pipe (6) can be made of hollow screw mandrel, with fuse water inlet (5) thread connection and be fixed on the tripod (3), fuse (4) below is provided with delivery port (7) and apopore (8).
It is coniform that fuse (4) can be made interior sky, because fuse (4) is made short fuse, corresponding shell (1) is also made supporting short shell (1), when the fuse height was 100 mm, part (4-1) highly was 70% of fuse height, i.e. 70 mm on the fuse, tapering is 1:30, part (4-2) highly is 30% of fuse height under the fuse, i.e. 30 mm, and tapering is 1:17.
Be fixed with aluminium inner sleeve (9) in the shell (1), with bolt that aluminium inner sleeve (9) and shell (1) is fastening, inner sleeve (9) below is provided with apopore (8), is provided with copper liner (10) in the inner sleeve (9), i.e. the red copper liner, copper liner (10) diameter is greater than aluminium inner sleeve (9) diameter, copper liner (10) is interference fit with aluminium inner sleeve (9), adopts the hot charge practice assembling to connect, after the cooling, during use, copper liner (10) can be extracted out from aluminium inner sleeve (9) and be convenient to change.
Between fuse (4) and the liner (10) aluminium liquid entrance (11) is arranged, aluminium liquid in certain composition ratio preparation, temperature requirement enters from aluminium liquid entrance (11), liner (10) is as working face, fuse water inlet pipe (6) is inputted cooling water in fuse, shell water inlet pipe (2) is inputted cooling water from shell to aluminium inner sleeve (9).
During the casting beginning, water diversion disk is in place, chute and screen pack are installed, crystallizer shell (1) and drawing bar (14) contraposition, starting lift rises, drawing bar (14) is suitable for reading to be contained in tripod (3) pin in the upper cannelure (13) of shell (1) to shell (1) low 2 ~ 3cm place suitable for reading, and fuse (4) enters drawing bar (14) inner ring simultaneously; Minute aluminium dish is installed to the distribution spoon of crystallizer, be coated with lubricating oil at crystallizer liner (10) and fuse (4), open cooling water, open large head piece, aluminium liquid flows into a minute aluminium dish through chute, reach minute aluminium dish three/two to aluminium liquid and o'clock open minute little head piece of aluminium dish, aluminium liquid is by distributing spoon inflow crystallizer, and aluminium liquid is subjected to shell (1) and fuse (4) cooling, begins to solidify, form crystalline film at surfaces externally and internally, the middle liquid cave that forms, the bottom wraps on the drawing bar (14), and solidified aluminum shrinks, inner ring is close on the tapering fuse (4), continue once cooling, prevent the crystalline film remelting, start lift and descend, drawing bar (14) descends, and the aluminium that has solidified is subjected to traction to begin to descend; Enter lower tapering, crystalline film and fuse form the space between (4), reduce contact area, prevent drawing crack and embrace core, cooling dies down, along with drawing bar (14) descends, because crystallization is very short, it is cold by force that surfaces externally and internally is met the hydrophthalmia injection water very soon, enters the secondary cooling, coagulation forming.Adjust large head piece, rill mouth aluminium flow quantity and decrease speed and make and reach flow equilibrium, adjust temperature of aluminum liquid, cooling water flow makes energy balance.Keep process of setting not too fast excessively slow, too fast solidifying shunk greatly, and Yi Baoxin crosses and throws off crystallizer when not solidifying slowly, and will cause running stream is that aluminium liquid leaks.
Claim protection domain of the present invention is not limited to above-described embodiment.
Claims (3)
1. short crystallizer that is used for the cast aluminum-molykote composite material hollow ingot, comprise crystallizer shell (1), shell water inlet pipe (2), tripod (3) snaps in the cannelure (13) of shell (1), and can rotate at shell (1), be fixed with inner sleeve (9) and liner (10) in the shell (1), fuse (4) is placed in the liner (10), there is water inlet (5) fuse (4) top, water inlet (5) is connected to fuse water inlet pipe (6), fuse water inlet pipe (6) is installed on the tripod (3), fuse (4) below is provided with delivery port (7) and apopore (8), between fuse (4) and the liner (10) aluminium liquid entrance (11) is arranged, it is characterized in that: described fuse (4) is coniform for interior sky, highly be 80 ~ 120 mm, the upper Partial Height of fuse (4) is the 65-70% of fuse height, and tapering is 1:30 ~ 50, the lower Partial Height of fuse (4) is the 30-35% of fuse height, and tapering is 1:15 ~ 17.
2. a kind of short crystallizer for the cast aluminum-molykote composite material hollow ingot according to claim 1, it is characterized in that: described inner sleeve (9) is aluminium alloy, being provided with liner (10) in the inner sleeve (9) is copper material, liner (10) and inner sleeve (9) are for interference fit connects, and liner (10) can be extracted replacing out from inner sleeve (9).
3. a kind of short crystallizer for the cast aluminum-molykote composite material hollow ingot according to claim 1 is characterized in that: be provided with apopore (8) below the described inner sleeve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012104737376A CN102909324A (en) | 2012-11-21 | 2012-11-21 | Short crystallizer for casting hollow aluminum ingots |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104737376A CN102909324A (en) | 2012-11-21 | 2012-11-21 | Short crystallizer for casting hollow aluminum ingots |
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| CN102909324A true CN102909324A (en) | 2013-02-06 |
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| CN2012104737376A Pending CN102909324A (en) | 2012-11-21 | 2012-11-21 | Short crystallizer for casting hollow aluminum ingots |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109570459A (en) * | 2019-02-13 | 2019-04-05 | 济南东方结晶器有限公司 | A kind of continuous cast mold for continuous casting copper pipes |
| CN113061742A (en) * | 2021-03-23 | 2021-07-02 | 攀枝花学院 | Equipment and method for casting thick-wall titanium metal and titanium alloy pipe by electron beam |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3342252A (en) * | 1964-09-15 | 1967-09-19 | Kennecott Copper Corp | Mandrel for continuous casting mold |
| CN101161371A (en) * | 2007-11-22 | 2008-04-16 | 台山市金桥铝型材厂有限公司 | Method for cooling cast hollow core clava blank with endoporus water as well as its apparatus |
| CN101745627A (en) * | 2008-12-18 | 2010-06-23 | 苏州有色金属研究院有限公司 | Multilayer heterogeneity aluminum alloy synchronous compound casting device |
| CN201889398U (en) * | 2010-12-01 | 2011-07-06 | 金川集团有限公司 | Casting device of vertical copper and copper alloy thick-wall hollow casting ingot |
-
2012
- 2012-11-21 CN CN2012104737376A patent/CN102909324A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3342252A (en) * | 1964-09-15 | 1967-09-19 | Kennecott Copper Corp | Mandrel for continuous casting mold |
| CN101161371A (en) * | 2007-11-22 | 2008-04-16 | 台山市金桥铝型材厂有限公司 | Method for cooling cast hollow core clava blank with endoporus water as well as its apparatus |
| CN101745627A (en) * | 2008-12-18 | 2010-06-23 | 苏州有色金属研究院有限公司 | Multilayer heterogeneity aluminum alloy synchronous compound casting device |
| CN201889398U (en) * | 2010-12-01 | 2011-07-06 | 金川集团有限公司 | Casting device of vertical copper and copper alloy thick-wall hollow casting ingot |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109570459A (en) * | 2019-02-13 | 2019-04-05 | 济南东方结晶器有限公司 | A kind of continuous cast mold for continuous casting copper pipes |
| CN109570459B (en) * | 2019-02-13 | 2024-04-09 | 济南东方结晶器有限公司 | Continuous casting crystallizer for continuous casting copper pipe |
| CN113061742A (en) * | 2021-03-23 | 2021-07-02 | 攀枝花学院 | Equipment and method for casting thick-wall titanium metal and titanium alloy pipe by electron beam |
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Application publication date: 20130206 |