CN1063365C - 'Continuous directional solidifying precision casting process and appts. for shaped cylinder-shape thin wall piece - Google Patents
'Continuous directional solidifying precision casting process and appts. for shaped cylinder-shape thin wall piece Download PDFInfo
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Abstract
The present invention relates to a continuous directional solidifying precision casting process and equipment for large special shaped cylindrical thin wall pieces. The process is characterized in that a process method of continuous directional solidification or continuous casting with an electromagnetic crystallizer is used for the outer surface of a casting piece, and a process method of directional solidifying precision casting is used for the inner surface of the casting piece. A thin-shell ceramic mould core forms the inner surface of the casting piece. The equipment is characterized in that a heater, a heat shielding device (a radiation baffle plate) and a cooling device are arranged in the thin-shell ceramic mould core, and the equipment is basically same with the process device for directional solidifying precision casting. The equipment has the different point that the equipment is applied to the interior of the core, and besides, the equipment uses the rotary heater and the rotary cooling device so as to ensure that the circumference, the inner surface and the outer surface of a large thin wall piece have uniform and consistent temperature in the same horizontal surface.
Description
The invention provides a kind of continuous directional solidification precision casting technology and equipment of special-shaped tubular large thin-wall element, be particularly useful for making the missile bay body.
Tub also claims the missile bay body, is thin and long cylindrical part, and the general tactics missile diameter is about 300mm～1000mm, reaches 7～8 meters.In order to install and some cabins section that often it is decomposed into easy to make, some cabin section is cast with high-strength aluminum alloy, general cabin segment length 800mm (maximum reach 3000mm), thick 2～3mm, outer surface is the face of cylinder, inner surface has reinforcement and boss chess piece etc. anyhow, and they highly may be above several times or tens times of general wall thickness.The missile bay body will bear thrust of air-flow externally applied forces, inertia force, jet pipe or the like as the main body of spacecraft in addition, thereby requires it must have very high mechanical performance and metallurgical quality, and each cabin section all will be passed through the x-ray fluoroscopy inspection.To crackle, shrinkage porosite, pore, the casting flaw restriction such as to be mingled with very strict.Therefore the casting of missile bay is that very difficult, general casting method is inefficient.All adopt the difference casting to produce it both at home and abroad,,, remain: 1. fillibility deficiency in the some shortcomings part from the production effect for many years and the angle of further improving the quality of products though this method is the effective technology of production large thin-wall element of generally acknowledging.The cabin section that it is cast, when length was 800mm, its thickness was 8mm, failed to satisfy the requirement of the longer thinner cabin of casting section far away.2. feeding deficiency.Shrinkage defect often occurs, percent defective reaches 50%.Its longest cabin segment length 3000mm of tactical missile that a kind of advanced person is abroad arranged at present, thickness 2.5mm.Long but also thin so not only cabin Duan Shang does not find effective casting production process.
Since Chalmers at first adopts directional solidification studying plane and born of the same parents' shape to solidify in nineteen fifty-two, directional solidification technique is developed rapidly, since 60～seventies directional solidification precision casting have ever made huge contribution for production and the performance that improves aviation combustion gas whirlpool engine blade.Someone claims that be the age of directional solidification blade the eighties of turbo blade, and then be the age [1] of single crystal blade the nineties.As everyone knows, the fundamental prerequisite of directional solidification is exactly to make the temperature ladder G that the liquid maintenance is enough on the solid liquid interface
L, surplus in the of 20 year over the significant improvement of relevant directional solidification technique all carry out basically around above-mentioned problem, see document [1], [2], [3], [4].Wherein outstanding process is:
(1) high speed freezing method (abbreviating H, R, S as), its main points are that the finish cast die shell is fixed on the water-cooled copper base (also claiming crystallizer), rise up in the heat tracing stove, make the copper pedestal and the width of cloth penetrate baffle plate at sustained height, are cooling device below.During work earlier top heat tracing stove be heated to predetermined temperature, cast article, to copper pedestal spray cooling water, then copper pedestal descend, just high temperature (more than the melting point metal) formwork drops to the cooling zone gradually.
(2) liquid metal cooling method (L, M, C method), with the difference of last method mainly below the cooling zone change a pond liquid metal tin into, after the foundry goods casting, copper pedestal (or claiming crystallizer) and formwork are fallen into Xi Chizhong with certain speed, can further improve thermograde G like this
LAlthough directional solidification technique has been made huge contribution on the sheet when development, but its type of cooling is by copper pedestal and the heat radiation downwards of the foundry goods in formwork itself, and outwards dispel the heat by formwork, these heat radiation approach all are slow, this has just determined its productivity ratio and casting dimension to be subjected to certain limitation, so far the length of blade of being produced has only mm more than 100, and other small-sized foundry goods.
Famous scholars such as Kerr, M.C.flemings and big wild sincere U.S. have been developed this technology, continuous directional solidification technology [5], [6] have been proposed, its the frozen metal part expose in atmosphere or cooling medium (not in formwork) fully, this has just improved cooling velocity greatly, produced the various small-cross section profiles (about diameter 10mm) of endless, but it is just impossible to produce irregularly-shaped castings with it.This method becomes the effective way of producing small bore high-grade section bar now.As seen directional solidification and continuous directional solidification still are in theoretical research, produce small-sized foundry goods and small-cross section profiles stage now, with the production of its theoretical solution heavy castings and the work of quality problems finding are not arranged as yet.In addition, electromagnetic crystallizer is cast casting continuously and was formally put into production in the Soviet Union then in 1969, and the U.S. also put into production after 8 years.See [7], [8], [9], [10].This technology has many superiority, generally acknowledged by countries in the world that its main feature is that foundry goods is not molded before not solidifying, do not contact and only under electromagnetic force and surface tension effects, form bright and clean surface, treat that it solidifies rear surface fineness and can reach with any solid matter
6[7].
The so-called special-shaped tubular large thin-wall element of the present invention means the used large tube-like of space flight and aviation cabin body and wallboard, most typical product is exactly the missile bay section, it is that diameter is 300～1000mm, surfaces externally and internally is the face of cylinder, but be distributed with different reinforcements anyhow, round platform chess piece etc. on the inner surface, thickness is 2.5mm, length 800～1000mm.Treat such foundry goods, space flight and aircraft industry are used very wide, still do not have desirable casting method at present.Directional solidification or continuous directional solidification or electromagnetic crystallizer continuous casting all can not be finished this mission.But the high-quality of three's product that is to say high density (derive from high trousers contract performance), and three high filling capacities (document [6] is said the little rod that can cast out φ 0.5mm) then be the foundation that the present invention proposes.
The objective of the invention is to propose a kind of continuous directional solidification precision casting technology and equipment of making the high-quality missile bay body of growing not only but also approaching that is applicable to.
A kind of special-shaped tubular Large Scale and Continuous directional solidification precision casting technology is as follows: at first the calandria 12 of heat tracing stove, the calandria 18 and the core internally heated oven of core preheating furnace send electrical heating, make the heat tracing stove all reach predetermined temperature everywhere, the good liquid metals of refining is cast in the crucible 10, enter by crystallizer, core, in the die cavity that the top three of extraction catheter 3 is formed, start cooling device this moment, liquid aluminum alloy bottom in extraction catheter 3 and the die cavity is cooled, solidified the layer of aluminum alloy on the top of extraction catheter 3, after the measured millivolt of thermocouple number reaches certain numerical value, start and draw base 1 traction extraction catheter 3 and foundry goods bottom 5 gradually by drawing in the crystallizer 7, be further cooled, it is characterized in that: crystallizer is an electromagnetic crystallizer 45, the moulding of continuous casting process is adopted on the surface outside foundry goods, heating, the type of cooling, and the moulding of the directional solidification precision casting of surface employing within it method, heating, the type of cooling.
A kind of special-shaped tubular large thin-wall element continuous directional solidification precision casting equipment, mainly form by the calandria 12 of crystallizer 7, crucible 10, heat tracing stove, the core in the crystallizer, the heating furnace in the core, the outer cooler around the foundry goods, it is characterized in that electromagnetic crystallizer 45 is arranged below crucible 10, the core of crystallizer is a shell ceramic core 21, an intercooler 2 is arranged in shell ceramic core 21, in intercooler 2, a central vertical shaft 39 is arranged, supporting intercooler 2 and other parts.
Good effect of the present invention:
1. can stop shrinkage defect
2. can cast the thick cabin section of 2.5mm, not be subjected to the restriction of length and alloy species.
3. can realize hot investment casting for large-scale cabin section, its outer surface is by finish turning graphite crystallizer or electromagnetic crystallizer moulding, and its inner surface is by the ceramic core moulding, so the foundry goods surfaces externally and internally is bright and clean, size accurate, can realize not having surplus or few surplus casting.
4. can produce high comprehensive mechanical performance missile bay body, especially fatigue behaviour, decay resistance, heat resistance, percentage elongation will be greatly improved.
When thereby the sand mold of 5. having cancelled former technology has been saved sandbox, model, molding mixture, moulder etc., reduced cost.
Fig. 1, be the vertical section schematic diagram of the embodiment of the invention one equipment;
Fig. 2, be the vertical section schematic diagram of the embodiment of the invention two equipment;
Fig. 3, be the A-A profile of Fig. 1;
Dovetail groove schematic diagram among Fig. 4, the embodiment one on the core;
Fig. 5, core print 33 structural representations;
The vertical section schematic diagram of Fig. 6, the general embodiment of the invention three equipment.
Embodiment one
The concrete practice of the present invention is moulding, heating and the type of cooling that the outer surface (external cylindrical surface) at foundry goods adopts continuous directional solidification, and for example its cylindrical outer surface is by crystallizer 7 moulding.On crystallizer 7,12 heating of the calandria of aluminum alloy melt 11 usefulness heat tracing stoves, under crystallizer 7, the surface is with 6 coolings of inner rotary cooler outside the foundry goods.And its inner surface is an inner cylinder face, be distributed with reinforcement and boss chess piece etc. anyhow on it, adopt directional solidification precision casting [1], the moulding of [3], heating, the type of cooling: adopt 21 moulding of shell ceramic core, near liquid-solid boundary 34, be provided with the width of cloth and penetrate baffle plate 32, rotary funace 20 in being provided with thereon is provided with intercooler 2 under it.
The core print 33 of shell ceramic core 21 by heat-resisting steel is assemblied in draws on the base 1, with interior hexagonal counter-sunk screw locking, around both, refill and mix extraction catheter 3 again, with screw lock it.Before the work beginning, draw base 1 and drive shell ceramic core 21 and extraction catheter 3, from bottom to top enter in the crystallizer 7, stop at the top that makes extraction catheter 3 and enter 20mm place in crystallizer 7 end openings.
General continuous directional solidification method, the problem of research is a little bar about φ 1Omm, draw out from graphite crystallizer, obtain a quality product, governing factor is also fewer: 1. liquid metals temperature, 2. graphite crystallization actuator temperature, 3. cooling medium amount and kind, 4. cooling medium and crystallizer distance.The present invention than last method complexity many, its special being:
1. product is special-shaped tubular large thin-wall element, though the very little casting dimension in its cross section very big (it is long to reach 3000mm, and diameter phi can reach 1000mm).Thereby on same horizontal cross-section, along the circumferential direction might produce the even phenomenon of temperature distributing disproportionation, and cause the technology failure.In order to address this problem, the present invention has adopted the heating and the cooling device of rotation, has for example adopted interior rotary funace (20) and inner rotary cooler 6 and intercooler 2.
2. shell ceramic mould 21 must be moved simultaneously with foundry goods, and is simultaneously static, promptly keep static relatively, otherwise just can not casting inner surface has the missile bay section of reinforcement and round platform chess piece etc. anyhow, so be referred to as " servo-actuated core ".
3. the temperature field influence as 21 pairs of foundry goods of shell ceramic core of " servo-actuated core " is very big, thereby its thermophysical property (as thermal conductivity, heating cooling time stability) is very important.General turbine is sent out but the machine blades oriented and is solidified hot investment casting and stubbornly resist with ceramic shell mould (being mixed with the oar material and aluminium vanadine granulated aggregate is made by silicate hydrolyzate liquid and aluminium vanadine powder), belongs to heat-insulating material, falls far short with the thermal conductivity of aluminium alloy.The present invention then require more thermal conductivity, when preparing the slurry of shell ceramic core 21, except that silicate hydrolyzate liquid and aluminium vanadine powder, increased graphite powder for this reason, in aggregate, except that aluminium vanadine particle, also increased a graphite material or wire netting fragment etc.
4. the present invention has different processing processing modes to the surfaces externally and internally of product: the heating, moulding, the type of cooling that its surface are adopted continuous directional solidification method (for example O, C, C method) or electromagnetic crystallizer continuous casting process.Its inner surface is then adopted heating, moulding, the type of cooling of directional solidification precision casting method.But these two kinds of technologies all have certain liquid-solid boundary position, for example the liquid-solid boundary position of directional solidification method is near the width of cloth is penetrated baffle plate, and the liquid-solid boundary of continuous directional solidification method exit under crystallizer, therefore should guarantee when this equipment is installed: the width of cloth in the shell ceramic core 21 is penetrated baffle plate 32 should be in same level height with the following outlet of crystallizer 7.The type of cooling of these two kinds of worker's cores has very big difference in addition: outer surface directly contacts cooling medium, and its inner surface is surrounded by shell ceramic core 21, cooling medium is sprayed on the shell ceramic core 21, can not directly contact the inner surface of foundry goods, therefore cause foundry goods surfaces externally and internally non-uniform temperature easily, cause the failure of worker's core.For surfaces externally and internally temperature evenly (being that the surfaces externally and internally thermograde is little) and thermograde that enough big vertical direction is arranged, just need control several factors (except four factors that the above general continuous directional solidification will be controlled) as the calandria 12 of heat tracing stove and the heating intensity and the geometric height of interior rotary funace 20.The intensity of cooling (quantity, the kind that comprise cooling medium) of intercooler 2 and inner rotary cooler 6, and inner rotary cooler 6 must be lower than intercooler 2 certain distances.
Fig. 1 is the equipment schematic diagram of embodiments of the invention one, and Fig. 3 is the A-A generalized section of Fig. 1, below in conjunction with Fig. 1 and Fig. 3 device structure of the present invention is described.Present device is made up of following four parts:
Bottom is " drawing and cooling segment ", comprises the parts of sequence number 1-6.
The centre is " a heat tracing stove ", comprises the parts of sequence number 7-15.
Be " core preheating furnace " topmost, comprise that sequence number is the parts of 16-19.
The side is that " aluminium water stores and filters stove, comprises the parts of sequence number 22-29.
Wherein:
The disk of drawing base 2 and be a heat-resisting steel has a hollow filament thick stick, can move up and down along vertical axis in order to guarantee it, and it also is locked on the base plate 35 with nut, and base plate 35 has four axis holes to be through on four vertical pillars 36.Draw base and also have a centre bore, wherein running through central vertical shaft 39.
Intercooler 2 is red copper pipeloops, there are one or two row's apertures in the outside, be installed on the central vertical shaft 39, square certain distance under crystallizer 7, when center vertical axis 39 when its injects cooling medium, cooling medium then sprays side within shell ceramic core 21 equably by aperture, if central vertical shaft 39, when rotating slowly, it is and then rotation also, and sprays and cool off more evenly.Cooling medium can adopt water or frozen water or cooling agent (water+ice cube+salt is formulated).
Dovetail groove 4 shapes such as Fig. 4 show, have 16, are evenly distributed on the top of extraction catheter 3, enter wherein when first strand of aluminium liquid contacts with extraction catheter 3, after solidify foundry goods bottom 5, link together by solid aluminum in the dovetail groove 4 and extraction catheter 3.
Foundry goods bottom 5
Inner rotary cooler 6 is red copper pipeloops, the side is lower than intercooler 2 certain distances under the following outlet of crystallizer 7, with to draw base coaxial by dress, can slowly back and forth rotate, there are one or two row's apertures the inboard, can spray cold ground medium equably in cast(ing) surface, cooling medium can adopt water or frozen water or cold ground agent (formulated as water+ice cube+salt).
Crystallizer 7 is the graphite cylinders that internal diameter is identical with the foundry goods external diameter, and certain thickness is arranged, and also useful ceramics or stainless steel are made.Be installed on the deceitful plate 8 of stove, under the crucible 10, the coaxial installation in hole within its endoporus and crucible 10 and the drop-bottom 8.
Drop-bottom 8 is ring dress plates that steel plate is made, and its diameter of bore is slightly larger than the foundry goods external diameter, and it is being supported by four columns 36, is carrying again that heat tracing stove, core give hot stove, aluminium water is stored and filter the stove total weight.
Crystallizer heating furnace 9 is the cloudy silk of electricity stoves (or annular silicon carbon resistor) that turn around outside crystallizer 7.
The similar large-scale laundry basin of crucible 10 shapes, but the porose foundry goods that is slightly larger than in center makes with graphite or carborundum, is installed on the crystallizer 7.
Aluminum alloy melt 11 splendid attires are in crucible 10.
The calandria 12 of heat tracing stove is resistance wire (an also available silicon carbon-point), is installed in side within the insulation material 13.
Insulation material 13 is installed in side within the heat tracing stove furnace shell 14.
Heat tracing furnace shell 14 is the tubular spares with sheet metal system.Be installed on the drop-bottom 8 side outside the insulation material 13.
Upper cover plate 15 is the big steel plates of ring-type, and middle macropore is greater than shell ceramic core 21 external diameters, installation coaxial with it.And be on the heat tracing stove furnace shell 14.
It is cylindrical member made from sheet metal that core gives hot stove furnace shell 16, is installed on the upper cover plate 15, keeps coaxial with shell ceramic core 21.
Insulation material 17 is installed in core and gives side within the hot stove furnace shell 16.
The calandria 18 of core preheating furnace is installed in side within the insulation material 17 for resistance wire (or silicon carbon-point).
It is big ring-type steel plates that core gives hot stove bell 19, and internal diameter is greater than shell ceramic core 21, and coaxial with it installation is in the top that core gives hot stove furnace shell 16.
Shell porcelain core 21 have relatively thin wall thickness and stronger thermal conductivity in case under the cooling medium effect fast cooling.In aluminium barium soil powder, increased graphite powder or in aggregate, increased clipped wire when the coremaking for reaching this purpose.Or adopt wire netting so that increased thermal conductivity and intensity.Shell ceramic core 21 outer surfaces have geometries such as horizontal, vertical groove and round pool so that make various special-shaped tubular large thin-wall elements in addition.
Stick harness bar 22 is poles that refractory material is made.Storage aluminium crucible 23 is installed in aluminium water and stores and filter on the stove.
Wherein a certain amount of aluminum alloy melt to be filtered 24 of contain is placed in and filters on the crucible 26.Calandria 25 is a resistance wire, is centered around around storage aluminium crucible 23 and the filtration crucible 26.
Aluminium vanadine particle 27 is contained in and filters in the crucible 26
The width of cloth is penetrated baffle plate 32 and is made by insulating refractory, for example makes with the waterglass bonding with alumina silicate fibre and glass fiber etc.Shape such as plectane, middle porose, be installed on the central vertical shaft 39, be on the same horizontal plane with liquid-solid boundary 34, between interior rotary funace 20 and intercooler 2.The heat width of cloth in the heat tracing stove that its role is to avoid top is penetrated and is transmitted to following cooling zone, to obtain bigger thermograde.
Liquid-solid boundary 34
Central vertical shaft 39 reaches 8 meters, vertically be installed in the center of shell ceramic core 21,, be installed in two sliding bearings up and down of base (being reduction box) of its lower end by drawing the centre bore of base 1, two bearings are at a distance of about 2 meters, and purpose is to keep this stabilizer shaft degree and perpendicularity.This top is installed in the bearing on the horizontal cover plate 38.On inner this axle of base, be equipped with and practice wheel, drive, make it back and forth to rotate lentamente with practicing bar.Be equipped with on this axle of mid portion: interior rotary funace 20, the width of cloth are penetrated baffle plate 32, intercooler 2.This center is porose, can import the interior in succession rotary funace 20 of power line from top to down, and from bottom to top imports cooling medium supply intercooler 2.
The effect of horizontal cover plate 38 and support 37 is last spindle nose positions of fixed center vertical axis 39, to guarantee this perpendicularity.Horizontal cover plate 38 is discoid, and there is sliding bearing at its center, so that assemble mutually with central vertical shaft 39, support 37 is foundry goods, and its structure is for respectively there being a large circle up and down, and the centre has three plates that they are bound up.With screw and shop bolt they and drop-bottom 8 are linked together, become a space frame.
Method of operating
(1) above-mentioned various firing equipments are all started, the equipment each several part of making all reaches the temperature of regulation.(2) mention stick harness bar 22, make aluminium close liquid 24 and after filtering, enter in crucible 10 and the crystallizer 7, go forward side by side in the dovetail groove 4 with end in contact on the extraction catheter 3.(3) start intercooler 2 and inner rotary cooler 6, extraction catheter 3 and shell ceramic core 21 all are cooled, end and enter aluminium alloy in the dovetail groove and also be cooled and solidify one deck on extraction catheter 3.The aluminium that this moment, this one deck solidified has been fixed on the extraction catheter 3 by the aluminium in the dovetail groove.When the aluminium that solidifies when this one deck further was increased to certain thickness, when the maximum temperature of indication reached a certain numerical value among the thermocouple group 30, electronic computer started the draw-gear of drawing base 1 by degree.It is together downward to draw base 1, extraction catheter 3, shell ceramic core 21, foundry goods bottom 5 under the drive of draw-gear, shifts to outside the crystallizer 7, and the device that continues to be cooled cools off.Electronic computer is gathered the highest millivolt number among the thermocouple group 30 at any time, and follow procedure is regulated heater of the present invention (supply voltage), cooling device (kind of cooling medium and quantity), the speed of drawing and is treated factor, just can reach the purpose that successfully realizes missile bay body continuous directional solidification precision casting this highest millivolt numerical control in a certain scope.
Embodiment two as shown in Figure 2.Comparison diagram 2 and Fig. 1 are visible, and both are similar.Difference is that the crystallizer of embodiment two is made up of promptly two parts: top graphite crystallizer 7 and following ceramic crystallizer 42, crystallizer heating furnace 9 also changes high-frequency heating in addition.So drop-bottom 8, heat tracing stove furnace shell 14, upper cover plate 15, core give hot stove furnace shell 16, core and give that hot stove bell 19, horizontal cover plate 38, support 37 are all corresponding takes anti-eddy current measure on the basis of embodiment one, promptly be riveted together with barium plate and bakelite plate, make above-mentioned part, for example for heat tracing stove furnace shell 14, in embodiment one, system is welded into tubular spare with monoblock sheet metal volume and gets final product, handy in the present embodiment several sheet metals and several thin bakelite plates are riveted together, and rivet into tubular more.For fear of the generation of eddy current, the calandria 12 of interior rotary funace 20, heat tracing stove, the calandria 18 of core preheating furnace all need be used the carbon silicon rod heating instead in addition.In addition, inner rotary cooler 6 is changed into pond rotation cooling upgrading, its rotary power is mainly from rotating spoon 43, intercooler is made up of three parts: pond shape cooler 40, cooling medium replensiher 41, it installs purpose is constantly to replenish cooling medium to pond shape cooling 40 rotatably, in order to avoid shell ceramic core 21 internal temperatures rise, cooling effect descends.And interior cold ground device 2, it is still a red copper pipeloop and makes, and there is 1～2 row's aperture in the outside, so that spray cooling medium to shell ceramic core 21.Cooling medium can adopt water or frozen water or cooling agent (water+ice cube+salt) or tin liquor.
Embodiment three
Its equipment as shown in Figure 6, it is to make on the basis of embodiment two (seeing the 2nd figure) as seen from the figure, the difference of it and embodiment two is the graphite crystallizer 7 on embodiment two equipment, ceramic crystallizer 42 and crystallizer heating furnace 9 are taken off, crucible 10 is reduced, and rotate on the drop-bottom 8, below it, install electromagnetic crystallizer 45 (electromagne tic mold) [9] [7] and shielding device 44.Cast(ing) surface is cooled off by inner rotary cooler 6 when this equipment work, the surface is cooled off by intercooler 2 within the shell ceramic core 21, has solidified foundry goods bottom 5, and on it some liquid aluminium alloy under the effect of electromagnetic force moulding but ot-yet-hardened, the liquid aluminium alloy that can be referred to as foundry goods under the effect of electromagnetic force moulding but ot-yet-hardened, can be referred to as the liquid part 46 of foundry goods, it does not contact with any other solids, just under electromagnetic force and surface tension effects, keeping the bright and clean face of cylinder, solidifying back fineness and can reach
6
List of references
[1] new development () of directional solidification and single crystal casting technology
﹠amp; #60 Cai Liaogongcheng ﹠amp; The new development (two) of #621990 the 6th phase [2] directional solidification and single crystal casting technology
﹠amp; #60 Cai Liaogongcheng ﹠amp; #621991 [3] ﹠amp; The #60 foundry goods forms Li Lun ﹠amp; The peace pavilion English chief editor of #62 Harbin Institute of Technology
[the 4] ﹠amp of China Machine Press; #60Solidification techniligy﹠amp; #62
JJ Burke Ohio1974[5] a kind of continuous casting process (O, C, C method) of novelty
Xing builds build ﹠amp; #60 Zhu Zaojishu ﹠amp; #621985.6[6] employing OCC process exploitation new product
Big wild sincere Mei ﹠amp; #60 light-alloy Jia Gongjishu ﹠amp; #621991 Vo19No3[7] electromagnetic forming casting is to the influence of aluminium alloy casting surface quality and cast sturcture
Zhao Binan [8] patent US 3646988[9] US 4,567,936[10] SU 438490
Claims (5)
1. a special-shaped tubular Large Scale and Continuous directional solidification precision casting technology is as follows: at first the calandria of heat tracing stove (12), calandria of core preheating furnace (18) and core internally heated oven send electrical heating, make the heat tracing stove all reach predetermined temperature everywhere, the good liquid metals of refining is cast in the crucible (10), enter by crystallizer, core, in the die cavity that the top three of extraction catheter (3) is formed, start cooling device this moment, liquid aluminum alloy bottom in extraction catheter (3) and the die cavity is cooled, the layer of aluminum alloy has been solidified on top at extraction catheter (3), after the measured millivolt of thermocouple number reaches certain numerical value, start and draw base (1) traction extraction catheter (3) and foundry goods bottom (5) gradually by drawing in the crystallizer (7), be further cooled, it is characterized in that: crystallizer is electromagnetic crystallizer (45), the moulding of continuous casting process is adopted on the surface outside foundry goods, heating, the type of cooling, and the moulding of the directional solidification precision casting of surface employing within it method, heating, the type of cooling.
2. special-shaped tubular large thin-wall element continuous directional solidification precision casting equipment, mainly by crystallizer (7), crucible (10), the calandria of heat tracing stove (12), core in the crystallizer, heating furnace in the core, outer cooler around the foundry goods is formed, it is characterized in that electromagnetic crystallizer (45) is arranged below crucible (10), the core of crystallizer is a shell ceramic core (21), an intercooler (2) is arranged in shell ceramic core (21), in intercooler (2), a central vertical shaft (39) is arranged, supporting intercooler (2) and other parts.
3. equipment according to claim 2 is characterized in that intercooler (2) is with speed rotation slowly.
4. equipment according to claim 2 is characterized in that intercooler (2) fixes.
5. equipment according to claim 2 is characterized in that the temperature data by the thermocouple group of computer acquisition electromagnetic crystallizer (45).
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| CN95103050A CN1063365C (en) | 1995-03-30 | 1995-03-30 | 'Continuous directional solidifying precision casting process and appts. for shaped cylinder-shape thin wall piece |
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| CN95103050A CN1063365C (en) | 1995-03-30 | 1995-03-30 | 'Continuous directional solidifying precision casting process and appts. for shaped cylinder-shape thin wall piece |
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| CN1063365C true CN1063365C (en) | 2001-03-21 |
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| CN102463322A (en) * | 2010-11-15 | 2012-05-23 | 贵州安吉航空精密铸造有限责任公司 | Method for improving quality of investment precision cast shuttering |
| CN103433431B (en) * | 2013-09-06 | 2016-08-31 | 安徽应流集团霍山铸造有限公司 | The ceramic core of cylinder head inner chamber |
| CN104668683A (en) * | 2015-01-13 | 2015-06-03 | 哈尔滨东安实业发展有限公司 | Vertical indexing mechanism and thin wall special-shaped part machining method through same |
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| GB2056342A (en) * | 1979-08-16 | 1981-03-18 | Sulzer Ag | Process for the production of castings solidifying in a required orientation |
| CN1069434A (en) * | 1991-08-15 | 1993-03-03 | 李忠炎 | A kind of casting technique of large thin-wall element and equipment |
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- 1995-03-30 CN CN95103050A patent/CN1063365C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2056342A (en) * | 1979-08-16 | 1981-03-18 | Sulzer Ag | Process for the production of castings solidifying in a required orientation |
| CN1069434A (en) * | 1991-08-15 | 1993-03-03 | 李忠炎 | A kind of casting technique of large thin-wall element and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1132127A (en) | 1996-10-02 |
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