CN110421144A - A kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect - Google Patents
A kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect Download PDFInfo
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- CN110421144A CN110421144A CN201910773212.6A CN201910773212A CN110421144A CN 110421144 A CN110421144 A CN 110421144A CN 201910773212 A CN201910773212 A CN 201910773212A CN 110421144 A CN110421144 A CN 110421144A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 51
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- 238000007667 floating Methods 0.000 title claims abstract description 28
- 230000000694 effects Effects 0.000 title claims abstract description 27
- 238000005495 investment casting Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 125
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000011049 filling Methods 0.000 claims abstract description 16
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- 238000007711 solidification Methods 0.000 claims abstract description 13
- 230000008023 solidification Effects 0.000 claims abstract description 13
- 230000033228 biological regulation Effects 0.000 claims abstract description 9
- 238000000889 atomisation Methods 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000010146 3D printing Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 244000035744 Hura crepitans Species 0.000 claims description 20
- 238000005192 partition Methods 0.000 claims description 17
- 238000002425 crystallisation Methods 0.000 claims description 16
- 230000008025 crystallization Effects 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 239000003110 molding sand Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
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- 239000000428 dust Substances 0.000 claims description 3
- 229910001651 emery Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- 238000005429 filling process Methods 0.000 abstract description 6
- 238000013019 agitation Methods 0.000 abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 16
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
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- -1 C 0.05% Substances 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Continuous Casting (AREA)
Abstract
The present invention provides a kind of high temperature alloy floating wall tile precision casting under adjustable pressure methods of additional electromagnetic field effect, comprising: prints to obtain the wax-pattern of running gate system using 3D printing technique；Atomization polishing grinding is carried out to wax-pattern, removes the surface laminated striation of wax-pattern；Multilayer shell is prepared on wax-pattern；Shell is demoulded later；High temperature alloy melt is poured into the shell of shell using the pressure regulation of vacuum anti-gravity and forms casting, outer plus alternating electromagnetic field during cast casting, make to play stirring action to high temperature alloy melt in the electromagnetic body force of filling and solidification processess, it generates forced convertion and changes the temperature field of high temperature alloy melt, concentration field, refined crystal grain.The present invention cooperates adjustable pressure casting device, is applied with alternating electromagnetic field in Filling Processes of Castings and process of setting, realizes the effect of electromagnetic agitation forced convertion, improves metallurgical quality of cast, reduces internal flaw, improves consistency.
Description
Technical field
The present invention relates to casting method fields, and in particular, to a kind of high temperature alloy of additional electromagnetic field effect is floating
Dynamic wall tile precision casting under adjustable pressure method.
Background technique
With flourishing for China's Aviation Industry, the design of aviation cast member has tended to " high quality ", " light weight
Change ", " precise treatment ", " being thinning ", " complication ".Adjustable pressure casting technique is a kind of novel anti-gravity accurate forming method, it
The advantages of combining suction pouring, low pressure casting and counter-pressure casting technology is that one kind of production high quality complex thin wall castings is normal
Use method.
Thrust ratio is the mostly important performance indicator of aero-engine performance, and improves the work of engine chamber floating wall
It is to improve an important measures of thrust ratio as temperature.Since floating wall tile is the high shape of typical thin-walled, dimensional accuracy
Complicated high-temperature alloy casting, so conventional articulated gravity full form casting process or the production of anti-gravity full form casting process are generallyd use,
To reach the control requirement of shape, dimensional accuracy.But even with antigravity casting technique, casting segregation is improved, is brilliant
The effect of grain refinement is also all limited, and the metallurgical quality and product qualification rate of floating wall casting are still lower.
It is found through retrieval, the Chinese patent of 103302242 A of Publication No., discloses a kind of typical high temperature alloy floating
Wall tile pressure-adjusting casting method is joined by adjusting the techniques such as vacuum degree, mold filling pressure, pressing speed, crystallization pressure, dwell time
Number, improves the mold-filling capacity of melted metal and the consistency of solidified structure.But the patent is only by adusting technological parameter,
It is very limited to the component segregation improvement of aluminium alloy, type, which is filled, in particular by gas pressure control is difficult to disappear with process of setting
Except the center segregation of casting, also it is not easy to interrupt or be crushed dendrite wall and then refines crystal grain.
It is found through retrieval, the Chinese patent of 105583366 A of Publication No., discloses a kind of accurate casting of floating wall tile
Method is made, improving the mobility of liquid metal by way of promoting the preheating temperature of shell.But above-mentioned patent exist with
Lower deficiency, due to the raising of shell temperature, shell wall declines the tolerance of high-temperature liquid metal washed away, flowed, and is easy in liquid
Impurity is introduced in state metal, shell wall weakens the super cooling effect of liquid metal crystal grain, to reduce crystal grain refinement
Effect.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of high temperature alloy of additional electromagnetic field effect is floating
Dynamic wall tile precision casting under adjustable pressure method.
A kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect, packet are provided according to the present invention
It includes:
It prints to obtain the wax-pattern of running gate system using 3D printing technique；
Atomization polishing grinding is carried out to the wax-pattern, removes the surface laminated striation of the wax-pattern；
The shell of multilayer is prepared on the wax-pattern；
The shell is demoulded；
High temperature alloy melt is poured into the shell of the shell using the pressure regulation of vacuum anti-gravity and forms casting, in the casting
Additional alternating electromagnetic field during part is cast, makes in the electromagnetic body force of filling and solidification processess to the high temperature alloy melt
Stirring action is played, forced convertion is generated and changes the temperature field of high temperature alloy melt, concentration field, refined crystal grain.
Further, the method executes according to the following steps:
S1: it in conjunction with casting Technology Design principle and casting emulation CAE technology, is reasonably poured for the floating wall tile design
Injection system and casting process scheme；
S2: it prints to obtain the photosensitive resin wax mould of solid of the running gate system using 3D printing technique；
S3: carrying out atomization polishing grinding to the wax-pattern, removes desurfacing line and ensures its surface quality；
S4: the manipulator by housing apparatus processed automatically is that the resin wax-pattern carries out repeated multiple times serous infiltration, emery dust
Spray, dry, obtained multilayer fine casting shell；
S5: roasting the shell and remove its internal resin, cleans the shell removal residual impurity；
S6: the shell and stalk are preheated；High temperature alloy ingot casting is placed under adjustable pressure casting device in the crucible of tank, and
In the case where vacuum degree is -30KPa~-50KPa negative pressure, melting is carried out to the high temperature alloy ingot casting；
S7: the shell and the stalk are placed in the adjustable pressure casting device, using sandbox, the fixed type of weight
Shell and the stalk, seal upper tank body, the lower tank of the adjustable pressure casting device；
S8: electromagnetic generator is arranged in the sandbox outer layer, starts the electromagnetic generator, adjusts the alternation in induction coil
Electric current；
S9: pressing preset differential pressure curve, start-up frequency control system, be sequentially completed the vacuumizing of casting, fill type, boosting,
The electromagnetic generator, cooling casting are closed in pressure maintaining, stress-relief process after high temperature alloy liquid is back to crucible from the stalk
Part is to room temperature.
Preferably, in S4, be made multilayer fine casting shell, every layer of shell with a thickness of 8~10mm.
Preferably, in S6, shell and stalk are preheated, comprising: superscribe one layer in the outer wall of the shell and play thermal insulation separation
The refractory cotton of heat effect coats one layer of anti-oxidant alumina powder film in the stalk inside and outside wall, and by the type
Shell is put into resistance-heated furnace together with the stalk, with the heating of constant heating rate, after being heated to certain temperature, and is carried out
Heat preservation.
Preferably, in S7, shell and stalk are fixed with sandbox, weight, is referred to the shell and the stalk is quick
It is transferred on the middle partition of adjustable pressure casting device, the adjustable pressure casting device is divided into upper tank body, lower tank, institute by the middle partition
Shell back-off is stated on the stalk, the stalk passes through the crucible of the lower tank of the middle partition and adjustable pressure casting device
Connection；The gap between the lower tank and middle partition of the adjustable pressure casting device is isolated with weight and sealing ring, will tip upside down on described
The sandbox for the induction coil that the shell on stalk is wound with electromagnetic generator with outer layer covers, then molding sand is filled up the sand
The sandbox and the middle partition are fixed together by the internal layer of case, then seal upper tank body described in the adjustable pressure casting device
With the lower tank.
Preferably, in S6, the material of the high temperature alloy ingot casting is M951 alloy, by the element of following mass percentage
Composition, C 0.05%, Cr 9.00%, Co 5.00%, W 3.50%, Mo 3.00%, Nb 2.20%, Al are
5.90%, Y 0.02%, B 0.024%, Ni surplus.
Preferably, in S8, the size of alternating current is 10A.
Preferably, in S9, crystallization pressure 200KPa~300KPa, the dwell time is 5min~25min.Crystallization pressure and guarantor
The pressure time has a significant impact consistency, the secondary dendrite spacing of casting.Crystallization pressure refer in pressure curve lower pressure tank with
Difference of the upper pressure tank in crystallization pressure maintaining section.There are consistency, the secondary dendrite spacing of casting in crystallization pressure and dwell time aobvious
Writing influences.
Compared with prior art, the present invention have it is following at least one the utility model has the advantages that
In the above method of the present invention it is creative by antigravity casting in conjunction with additional electromagnetic field, metal fill type and
Apply alternating electromagnetic field in process of setting, plays forced convertion, inhibits the effects of segregation, refinement crystal grain, improve cast(ing) surface
Quality and inherent quality, promote casting service performance at refinement crystal grain.The control of liquid metal filling and solidification processess is to improve casting
The key of the important channel of part institutional framework, raising mechanical performance.
The above method of the present invention can be effectively prevent melt contamination and be introduced gas using vacuum anti-gravity adjustable pressure casting mode
Body is mingled with, to reduce the oxide inclusion and stomata in casting.
Further, the above method of the present invention, filling the parameters such as type pressing speed and mold filling pressure by control can guarantee casting
The liquid level of part cavity filling process is steady, reduces fluid spills and washes away erosion to shell inner wall, to reduce slag；Pass through control
Crust pressure, crystallization pressurization, effective feeding of dwell time certifiable casting solidification process, promote the consistency of casting；Pass through
The segregation of casting solidification process can be effectively suppressed in additional alternating electromagnetic field, reduces loose, shrinkage cavity, refines crystal grain, promotes casting
Mechanical property.
Further, the above method of the present invention, the sandbox acted on using couple electromagnetic generator, cooperation adjustable pressure casting dress
It sets, is applied with alternating electromagnetic field in Filling Processes of Castings and process of setting, realize the effect of electromagnetic agitation forced convertion, improve casting
Part metallurgical quality reduces internal flaw, improves consistency, while further refinement is also obtained in the grain size of solidified structure,
Also it is effectively reduced the generation of casting solidification segregation, the appearance profile of casting is more clear, and surface quality is high.
Further, the vacuum degree that is good and sealing before filling type of the above method of the present invention, adjustable pressure casting device effectively avoids
The generation of stomata and oxide inclusion；Pressure difference between upper tank body, lower tank is conducive to improve feeding a casting and melt flows
The defects of driving force realizes consecutive solidification, reduces shrinkage porosite, shrinkage cavity and misrun.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of adjustable pressure casting device in one embodiment of the present invention；
Fig. 2 is IGBT intermediate frequency furnace smelting technology curve in one embodiment of the present invention；
Fig. 3 is adjustable pressure casting process curve in one embodiment of the present invention；
Fig. 4 is the wall part drawing to float in one embodiment of the present invention；
Figure acceptance of the bid note is expressed as: upper tank body 1, lower tank 2, middle partition 3, sandbox 4, molding sand 5, heat preservation asbestos 6, electromagnetism
Generator 7, stalk 8, high temperature alloy melt 9, crucible 10, pedestal 11, air-path control system 12, shell 13.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
High temperature alloy floating wall tile is the important thermal component of aero-engine high temperature combustors.Implement below the present invention
Example provides a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect, and this method includes being beaten using 3D
Print technology prints to obtain the wax-pattern of running gate system；Atomization polishing grinding is carried out to wax-pattern, removes the surface laminated striation of wax-pattern；In wax-pattern
The shell 13 of upper preparation multilayer；Shell 13 is demoulded later；High temperature alloy melt 9 is poured using the pressure regulation of vacuum anti-gravity
Casting is formed in the shell of shell 13, outer plus alternating electromagnetic field during cast casting, in the specific implementation, by air pressure
An electromagnetic generator 7 is mounted with outside upper tank sandbox 4 on the vacuum adjustable pressure casting device of control, thus in the mistake of cast casting
Additional alternating electromagnetic field, makes to play electromagnetism to high temperature alloy melt 9 in the electromagnetic body force of filling and solidification processess in journey
Stirring action generates forced convertion and changes the temperature field of high temperature alloy melt 9, concentration field, mitigates casting aliquation, refined crystalline substance
Grain.
In the above method, stirring action is played to high temperature alloy melt 9 in the electromagnetic body force of filling and solidification processess,
Specifically, electromagnetic agitation reduces the constitutional supercooling of melt temperature gradient and liquid/solid interface, effectively in mitigation or elimination
Heart segregation, promotes non-spontaneous forming core, thus thinning solidification structure.Electromagnetic agitation makes the crystal grain of fusing be easier to enter simultaneously
Interdendritic regions, so that loose, the shrinkage cavity defect of casting are further reduced.
In another specific embodiment, a kind of high temperature alloy of additional electromagnetic action is further illustrated in conjunction with adjustable pressure casting device
Floating wall tile precision casting under adjustable pressure method, the material used is M951 alloy.M951 high temperature alloy is a kind of nickel base cast high temperature conjunction
Gold, not only antioxygenic property is good, anti-fatigue performance is good, also has many advantages, such as low-density, good casting property.
It, can be using the adjustable pressure casting device of additional electromagnetic field effect, the pressure regulation in the embodiment of the present invention shown in referring to Fig.1
Casting device discloses in the prior art, and specific structural features can be found in the Chinese patent of Publication No. 102717051A.This
Embodiment is improved for above-mentioned adjustable pressure casting device, i.e., is mounted with outside the sandbox 4 of the upper tank body 1 of adjustable pressure casting device
One electromagnetic generator 7.Based on the structure feature of above-mentioned adjustable pressure casting device, additional electromagnetic field employed in the present embodiment is acted on
Adjustable pressure casting device include tank body, air-channel system, pedestal 11, crucible 10, electromagnetic generator 7 etc., wherein tank body is located at pedestal
11 top, tank body is interior to be equipped with middle partition 3, and cavity is divided into upper tank body 1, lower tank 2 by middle partition 3, and electromagnetic generator 7 is mounted on
Outside the sandbox 4 of upper tank body 1, crucible 10 is located in lower tank 2, and air-channel system distinguishes connection upper tank body 1, lower tank 2.Due to electricity
The presence of magnetic flux generator 7, during so that aluminium alloy fills type and solidification in shell 13, in addition to receiving upper tank body 1, lower tank
The differential pressure action of body 2 also extraly receives the function composite by electromagnetic stirring generated by induction coil.This electromagnetic field effect exists
Mechanical essence on microcosmic is a kind of electromagnetic force --- Lorentz force.In negative pressure cavity filling process, pressure is played to aluminium alloy
The effect of convection current reduces the component difference of different location inside aluminium alloy, accelerates heat dissipation of the aluminium alloy to casting shell molds 13,
And in positive pressure process of setting, it reduces the constitutional supercooling at liquid/solid interface, is effectively reduced the center segregation of casting, is crushed
Or dendritic arm is interrupted, refine crystal grain.
Using above-mentioned Fig. 1 shown device, the high temperature alloy floating wall of the additional electromagnetic field effect in one embodiment of the invention
Tile precision casting under adjustable pressure method, the specific steps are as follows:
S1: design floating wall casting program: being floating wall in conjunction with casting Technology Design principle and casting emulation CAE technology
It designs reasonable casting program and simulative optimization is carried out to casting process parameters.
S2:3D prints wax-pattern: printing to obtain the three-dimensional photosensitive resin of running gate system using photocuring 3D printing (SLA) technology
Wax-pattern.
S3: atomization polishing wax-pattern: atomization polishing grinding is carried out to wax-pattern, to remove desurfacing line and ensure its surface matter
Amount.
S4: prepare shell 13: the manipulator by housing apparatus processed automatically is that resin wax-pattern carries out repeated multiple times slurries leaching
Profit, emery dust spray, dry, the fine casting shell 13 with a thickness of 10mm of obtained multilayer.
S5: roasting is with cleaning shell 13: shell 13 being placed in high-temperature roasting furnace and removes the most photosensitive of its inside
Resin rinses cleaning shell 13 and removes residual impurity.
S6: one layer of insulation stone for playing function of heat insulation preheating shell 13 and stalk 8: is superscribed in the outer wall of shell 13
Cotton 6 coats one layer of anti-oxidant alumina powder film in 8 inside and outside wall of stalk, and by shell 13 and stalk 8 together its
It is put into resistance-heated furnace, is heated to 1000 DEG C with the constant heating rate of 5 DEG C/min, and keep the temperature 1h.
S6: fusing M951 alloy cast ingot: the upper tank body 1 of adjustable pressure casting device, lower tank 2 are sealed, start pressure regulation later
The air-path control system 12 of setting carries out vacuum pumping, keep adjustable pressure casting device 2 vacuum degree of lower tank be -30KPa~-
50KPa opens IGBT medium frequency induction power supply, and the fusing of M951 alloy cast ingot is heated to 1580 DEG C using common heating process.
It is intermediate frequency furnace smelting technology curve used by Binding experiment experience, this implementation in the present embodiment referring to shown in Fig. 2
Medium frequency induction power supply in example acts directly in lower tank crucible 10, and the biggest quality for the aluminium alloy that crucible 10 can accommodate is
10kg.The power that the melting of high temperature alloy needs is very big, and intermediate frequency heating power is bigger, and the aluminium alloy overheat time is longer, alloy
The scaling loss of element can be more serious.The mode for generalling use gradually incremental intermediate frequency furnace power carries out being heated to being completely melt to aluminium alloy
And have certain degree of superheat, while considering that casting shell molds 13 and stalk 8 shift the process being fixed in adjustable pressure casting device, have
Heat scatters and disappears, therefore the heating power of 25Kw and 30Kw are extended to 10min from 5min, to make up the heat damage of above procedure
It loses.
S7: fixed shell 13 and stalk 8: shell 13 and stalk 8 are cast by resistance-heated furnace fast transfer to pressure regulation
It makes on the middle partition 3 of device, on stalk 8, stalk 8 passes through under middle partition 3 and adjustable pressure casting device the back-off of shell 13
10 connection of crucible of tank body 2.The gap between good tune lower tank 2 and middle partition 3 is isolated with weight and sealing ring, liter will be tipped upside down on
The sandbox 4 for the induction coil that shell 13 in liquid pipe 8 is wound with electromagnetic generator 7 with outer layer covers, molding sand 5 is filled up sandbox 4
Sandbox 4 and the retaining ring of middle partition 3 are fixed together by internal layer with buckle and lock plunger, are then sealed on adjustable pressure casting device
Tank body 1, lower tank 2.The vacuum degree that is good and sealing before filling type of adjustable pressure casting device effectively prevents stomata and oxide inclusion
Generation；Pressure difference between upper tank body 1, lower tank 2 is conducive to improve the driving force of feeding a casting and melt flows, realization sequence
The defects of solidifying, reducing shrinkage porosite, shrinkage cavity and misrun.
S8, starting electromagnetic generator 7: the electromagnetic generator 7 for being located at 4 outer layer of sandbox is connected, the friendship in induction coil is adjusted
The virtual value of time-dependent current is to 10A.
S9, preset differential pressure curve is pressed, start-up frequency control system 12 is sequentially completed vacuumizing, filling type, rise for casting
Pressure, pressure maintaining, stress-relief process close electromagnetic generator 7, cooling casting to room after molten metal is back to crucible 10 from stalk 8
Temperature.As a preferred embodiment, crystallization pressure is 250KPa, dwell time 20min in S9.Crystallization pressure is finger pressure song
Lower pressure tank and upper pressure tank are in the difference for crystallizing pressure maintaining section in line.Crystallization pressure and dwell time are to the consistency of casting, two
Secondary interdendritic is away from having a significant impact.
Referring to shown in Fig. 3, start pressure regulation air-path control system 12, according to the vacuum level requirements of M951 alloy adjustable pressure casting,
Upper tank body and lower tank to adjustable pressure casting device are evacuated to setting value, usually -50KPa simultaneously.Adjustable pressure casting control at this time
System meeting automatic trigger processed is sequentially completed a liter liquid, fills type, crust pressurization, crust pressure maintaining, crystallization pressurization, synchronous boost, crystallizes and protect
Pressure, intercommunication, exhaust.From liter liquid stage up to crystallize pressurization stages, upper pressure tank be all it is invariable, equal to vacuumize terminate
The setting value in stage, and lower pressure tank is continuously increased in this process, but upper pressure tank and lower pressure tank are in this process
In all remain negative pressure.Specifically, the setting for rising the lower tank rate of rise and boost pressure that flow container rises the liquid stage will guarantee to rise
The flow regime of the molten metal of 8 cavity filling process of liquid pipe is laminar condition.And for tank mold filling pressure size under mold filling process of casting
Setting to be determined in conjunction with the thermal physical property parameter of the complex-shaped degree of casting, shape height, wall thickness and aluminium alloy, and fill type pressurization
The selection of speed will guarantee that aluminium alloy fills the steady of type in cast-internal.And in liter liquid and the whole process for filling type, electromagnetism occurs
Device 7 plays the role of forced convertion to aluminium alloy.This forced convertion effect reduces the temperature of different location inside aluminium alloy
Difference and component difference are spent, heat dissipation of the aluminium alloy to casting shell molds 13 is but accelerated, increases aluminium alloy at casting shell molds 13
Degree of supercooling.Thus fill type it is complete when, the molten metal that is contacted with casting shell molds 13 can earliest crystallization and freezing, lower tank is continued
Crust is pressurized and crusts pressure maintaining for a period of time, then can take the lead in bearing one layer tiny closely knit solidified shell near casting shell molds 13
Layer.But at this point, the aluminium alloy from solidification shell to cast-internal does not solidify but completely, there is still a need for further crystallizations to increase for lower tank
Pressure, this is conducive to casting and obtains better feeding in process of setting.Then the difference of lower pressure tank and upper pressure tank is kept (to tie
Brilliant pressure) it is constant, carry out upper tank body 1,2 synchronous boost of lower tank to barotropic state, then keep pressure tank up and down at this time into
Row crystallization.Direct draught crystallization pressure maintaining can guarantee the surface quality of casting for a period of time until aluminium alloy solidifies completely, and solidifying
Gu electromagnetic agitation during reduces the constitutional supercooling at liquid/solid interface, is effectively reduced the center segregation of casting.In addition, electric
Magnetic stirring not only makes the crystal grain of fusing be easier to enter interdendritic regions, reduces rarefaction defect, and it can be crushed or
Dendritic arm is interrupted, non-spontaneous forming core is promoted, refines crystal grain.Finally, intercommunication upper tank body 1, the pressure of lower tank 2 and exhaust.
The floating wall tile structure prepared through the foregoing embodiment is complicated, ultra-thin, precision is high.Referring to shown in Fig. 4, in wall thickness
It is distributed with 5 big holes, 9 big boss on about 1.5mm, 150mm × 50mm tile, 90 small boss, 90 small through hole, with
And several hundred air holes of a diameter less than 1mm.
The present embodiment combines adjustable pressure casting and electromagnetic field and applies upper advantage in casting, promotes casting molding to further
Quality, improvement cast structure and performance play a significant role.
It is one embodiment of the present of invention above, the present invention can also have other embodiments, for example change pressure regulation casting
The design structure of device couple electromagnetic generator 7 is made, parameter such as electric current, voltage, frequency in couple electromagnetic generator 7 are changed
Deng.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (8)
1. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect, it is characterised in that: include:
It prints to obtain the wax-pattern of running gate system using 3D printing technique；
Atomization polishing grinding is carried out to the wax-pattern, removes the surface laminated striation of the wax-pattern；
Multilayer shell is prepared on the wax-pattern；
The shell is demoulded；
High temperature alloy melt is poured into the shell of the shell using the pressure regulation of vacuum anti-gravity and forms casting, is cast in the casting
Additional alternating electromagnetic field during making makes to play the high temperature alloy melt in the electromagnetic body force of filling and solidification processess
Stirring action generates forced convertion and changes the temperature field of the high temperature alloy melt, concentration field, refines crystal grain.
2. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 1,
It is characterized by: the method executes according to the following steps:
S1: being floating wall tile design running gate system and founder in conjunction with casting Technology Design principle and casting emulation CAE technology
Skill scheme；
S2: it prints to obtain the photosensitive resin wax mould of solid of the running gate system using 3D printing technique；
S3: carrying out atomization polishing grinding to the wax-pattern, removes desurfacing line and ensures its surface quality；
S4: by housing apparatus processed automatically manipulator be the resin wax-pattern carry out repeated multiple times serous infiltration, emery dust spray,
It is dry, multilayer fine casting shell is made；
S5: roasting the shell and remove its internal resin, cleans the shell removal residual impurity；
S6: the shell and stalk are preheated；High temperature alloy ingot casting is placed in the crucible of adjustable pressure casting device lower tank, and
Vacuum degree is to carry out melting to the high temperature alloy ingot casting under -30KPa~-50KPa negative pressure；
S7: the shell and the stalk are placed in the adjustable pressure casting device, using sandbox, the fixed shell of weight
With the stalk, the upper tank body and the lower tank of the adjustable pressure casting device are sealed；
S8: being arranged electromagnetic generator in the sandbox outer layer, start the electromagnetic generator, adjusts the alternation electricity in induction coil
Stream；
S9: pressing preset differential pressure curve, start-up frequency control system, be sequentially completed the vacuumizing of casting, fill type, boosting, pressure maintaining,
Stress-relief process closes the electromagnetic generator after the high temperature alloy liquid is back to the crucible from the stalk, cold
The casting is to room temperature.
3. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 2,
It is characterized by: in S4, be made multilayer fine casting shell, every layer of shell with a thickness of 8~10mm.
4. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 2,
It is characterized by: preheating shell and stalk in S6, comprising:
One layer of refractory cotton for playing function of heat insulation is superscribed in the outer wall of the shell, coats one in the stalk inside and outside wall
The anti-oxidant alumina powder film of layer；
The shell is put into resistance-heated furnace together with the stalk, with the heating of constant heating rate, is heated to make a reservation for
After temperature, and kept the temperature.
5. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 2,
It is characterized by: fixing shell and stalk with sandbox, weight in S7, comprising:
By on the shell and the stalk fast transfer to the middle partition of the adjustable pressure casting device, the middle partition is by institute
It states adjustable pressure casting device and is divided into the upper tank body, the lower tank, the shell back-off is on the stalk, the stalk
Across the crucible connection of the middle partition and the lower tank of the adjustable pressure casting device；
The gap between the lower tank of the adjustable pressure casting device and the middle partition is isolated with the weight and sealing ring,
The shell tipped upside down on the stalk is wound with to the sandbox cover of the induction coil of the electromagnetic generator with outer layer
The sandbox and the middle partition are fixed together, then seal the tune by the internal layer for firmly, then by molding sand filling up the sandbox
Press upper tank body and the lower tank described in casting device.
6. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 2,
It is characterized by: the material of the high temperature alloy ingot casting is M951 alloy, by the element group of following mass percentage in S6
At: C 0.05%, Cr 9.00%, Co 5.00%, W 3.50%, Mo 3.00%, Nb 2.20%, Al are
5.90%, Y 0.02%, B 0.024%, Ni surplus.
7. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 2,
It is characterized by: the size of alternating current is 10A in S8.
8. a kind of high temperature alloy floating wall tile precision casting under adjustable pressure method of additional electromagnetic field effect according to claim 2,
It is characterized by: crystallization pressure is 200KPa~300KPa in S9, the dwell time is 5min~25min.
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| CN112317723A (en) * | 2020-11-02 | 2021-02-05 | 东南大学 | Metal casting method and equipment based on photocuring printing and casting mold differential pressure pouring |
| CN113802030A (en) * | 2021-10-14 | 2021-12-17 | 上海交通大学 | Rare earth high-temperature alloy construction material and ultralimit precision casting method thereof |
| CN115815570A (en) * | 2023-02-15 | 2023-03-21 | 中北大学 | Vacuum electromagnetic low-pressure mold filling device and process for preparing heterogeneous composite structure by adopting same |
| CN117816929A (en) * | 2024-03-06 | 2024-04-05 | 北京航空航天大学 | Vacuum pressure regulating extrusion die casting machine based on electromagnetic stirring |
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