CN108889924A - Ferromagnetic alloy vacuum casting short route casting method - Google Patents
Ferromagnetic alloy vacuum casting short route casting method Download PDFInfo
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- CN108889924A CN108889924A CN201810842573.7A CN201810842573A CN108889924A CN 108889924 A CN108889924 A CN 108889924A CN 201810842573 A CN201810842573 A CN 201810842573A CN 108889924 A CN108889924 A CN 108889924A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
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- 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
Abstract
The present invention provides one kind for improving in casting in metallurgical quality, shorten the ferromagnetic alloy vacuum casting short route casting method of full form casting process process, without dewaxing, without casting process, it is compound with fusion cast process and alloy casting is the same as the moulding integrated process combined of casting using shell preparation, by making melt cast alloys crucible with prepared shell, casting is obtained using high-frequency vacuum electric induction furnace induction heating fusing ferromagnetic alloy fusion cast process in shell, reduce traditional model casting production process, shorten technical process for casting and castings production period, not only improve production efficiency, it is energy-saving to subtract material, and improve casting quality, improve casting yield.
Description
Technical field
The invention belongs to precision casting technology fields, and in particular to shell preparation, alloy melting and mold filling and solidification it is ferromagnetic
Property alloy vacuum casting short route casting method, be a kind of for improving in casting in metallurgical quality, shortening model casting
Process flow, shell preparation is compound with fusion cast process and alloy casting is the same as the moulding integrated casting technique side combined of casting
Method.
Background technique
Model casting is that a kind of near-net-shape technique and precision casting produce most common casting method.Model casting
It is to manufacture apperance with fusible material, in meltable apperance coated with multiple layer refractory material, after its dry through, apperance is melted and is removed
And shell is made, shell is poured after high-temperature roasting, to obtain the casting method of casting.Model casting is also known as lost
Wax casting, wax-pattern manufacture and fusible pattern dewaxing are the essential production processes of model casting, and wax-pattern is due to intensity is low in demoulding, fortune
It easily deforms in defeated, group weldering and formwork preparation process, fusible pattern dewaxing easily causes shell to crack, and directly affects casting matter
Amount even causes shell to scrap when serious.
The precision castings such as nickel-base alloy impeller are produced using investment casting method, and technical process for casting is long, and production process is more,
Be related to manufacture wax-pattern, coat with stucco manufacture formwork, formwork hardening and drying, fusible pattern dewaxing, Baking, alloy melting and
The processes such as type, cooled and solidified, shelling cleaning and casting finish are filled in casting, and shell must carry out casting at high temperature and fill type, otherwise, high
Shell is also easy to produce cracking or even bursts under warm molten metal high wind-warm syndrome, and casting is caused to generate misrun defect, and alloy
Type is filled in melting and casting has oxidization burning loss and air-breathing, directly affects in casting in metallurgical quality, casting is caused to press from both sides
Miscellaneous and stomata class defect, causes casting to scrap.
Casting is the basis of equipment manufacture and the basic industry of national economy.In recent years, with equipment manufacture
Development and science and technology progress, China hot investment casting new process, new technology development and in terms of also achieve it is considerable
Progress.ZL200310103188.4 discloses a kind of precision casting process side that high-strength rigid formwork is molded as using foamed plastic
Method, producing foamed the modern designs of plastics after foamed plastic polystyrene is foamed, curing, cleared up through shell processed, roasting, High Strength Shell Mould,
Casting fills the processes such as type and completes castings production, simplifies production routine, shortens the period for manufacturing shell, reduce and be produced into
This；1 0274926.X of ZL2014 discloses a kind of method for preparing whole shell mould using formwork roasting apperance gasification, and combustion, uses
The plastics apperance substitution wax-pattern of injection molding forming method manufacture prepares formwork, then roasts gained formwork, obtains whole shell
Gained shell mould is finally cleared up and is poured by type, obtains casting, penetrating odor and casting when solving shell moulded casting casting
The problems such as subcutaneous blowhole, the defects of avoiding the carburetting of lost foam casting steel-casting and ironcasting elephant skin.
Although above two Precision Method preferably combines model casting and lost foam casting, in technique
Model casting dewaxing process is saved, but formwork or shell mould must inject molten metal at high temperature, otherwise, under high-temperature metal thermal shock
Easily there is cracking and even burst in formwork or shell mould, and can not solve oxidization burning loss and air-breathing in alloy melting and casting process and ask
Topic, casting fill type and there are problems that liquid alloy temperature loss, not can effectively improve in casting in metallurgical quality.Therefore, for nickel
It is urgently excavated in the precision castings such as based alloy impeller in the demanding casting technique of metallurgical quality.
Summary of the invention
It is an object of that present invention to provide a kind of for improving in casting in metallurgical quality, shortening full form casting process process
Ferromagnetic alloy casting method, it is intended to be prepared by shell and fusion cast process technology is compound and alloy casting is formed with casting
The casting technique that integration combines, using high-frequency vacuum electric induction furnace can induction heating melt ferromagnetic alloy, use institute
It prepares casting molding shell and makees crucible, melted alloy fusion cast process in shell is heated by high-frequency vacuum electric induction furnace and is obtained
Casting, no conventional cast are poured process, avoid casting and fill Shell cracking caused by type and liquid alloy temperature loss problem, solve
It has determined oxidization burning loss and air-breathing problem in alloy melting and casting process, has reduced model casting production process, it is energy-saving to subtract
Material, misrun are mingled with and are substantially reduced with stomata class defect, improve in casting in metallurgical quality.
Improve to realize in metallurgical quality, the purpose of shortening full form casting process process in accurate kind casting, the present invention mentions
For a kind of without dewaxing, the ferromagnetic alloy vacuum casting short route casting method without casting process, include the following steps：
Step 1, according to casting process scheme and the easy gasification, and combustion model material of selection, manufacture and design pattern molding processing
Mold；
Step 2, plastics apperance is manufactured with easy gasification, and combustion material using injection molding method；
Step 3, it is required according to casting Technology Design, step 2 gained plastics apperance is assembled into whole apperance；
Step 4, suitable binder and refractory material are selected according to technical conditions such as cast shape structure and casting alloys
Equal die casing materials, prepare surface layer slurry and backing layer slurry, whole mould obtained by the Conventional processing methods step 3 with model casting
Sample substitution wax-pattern prepares formwork, i.e., by coating, stucco, dry hardening obtain formwork；
Step 5, heat temperature raising speed, maturing temperature and time and type are determined according to model material and casting structure shape
Shell cooling velocity and the type of cooling, maturing temperature control are 5min~10min in 1100 DEG C~1200 DEG C, calcining time, will be walked
Rapid 4 gained formwork is roasted in resistance furnace, disappears to obtain shell mould using apperance gasification, and combustion；
Step 6, step 5 gained shell is cleared up and is examined, ensuring to require to claim after the assay was approved according to technique
Measured casting molding is packed into shell with alloy；
Step 7, induction heating founding will be carried out to get casting in the shell merging high-frequency vacuum induction furnace equipped with alloy.
Ferromagnetic alloy casting method provided by the invention, remarkable advantage be using shell preparation and founding at
Type technology is compound and alloy casting is with the moulding integrated casting technique combined of casting, no to dewax, without casting process, contracting
Short technical process for casting, it is energy-saving to subtract material, improve casting quality, improves casting yield.During castings production, a side
Face substitutes wax-pattern with plastics apperance using the Conventional processing methods of model casting and prepares formwork, obtains shell by roasting mold shell,
Apperance problem on deformation in demoulding, transport, assembly and formwork preparation process can be effectively solved, shell caused by avoiding fusible pattern from dewaxing
Crack problem；On the other hand using high-frequency vacuum electric induction furnace can induction heating melt ferromagnetic alloy, with prepared casting at
Type shell makees crucible, heats melted alloy fusion cast process in shell by high-frequency vacuum electric induction furnace and obtains casting, no biography
System casting and pouring process, avoids casting and fills Shell cracking caused by type and liquid alloy temperature loss problem, solve alloy
Oxidization burning loss and air-breathing problem in melting and casting process.
Casting method provided by the invention is a kind of without dewaxing, the ferromagnetic alloy vacuum casting short route without casting process
Casting method.This new casting technique can improve in casting in metallurgical quality, and reduce model casting production work
Sequence shortens the castings production period, avoids that model casting wax-pattern is easily-deformable and pouring liquid alloy temperature loses problem, solves
Shell cracking problem caused by type is filled in oxidization burning loss and air-breathing and casting in alloy melting and casting process, energy-saving to subtract
Material improves casting quality, and misrun is mingled with and is substantially reduced with stomata class defect, is particularly suitable in production part in metallurgical quality
The ferromagnetic alloys precision castings such as demanding nickel-base alloy impeller.
Detailed description of the invention
Fig. 1 is the flow diagram of ferromagnetic alloy vacuum casting short route casting method of the invention.
Specific embodiment
In order to be best understood from technology contents of the invention, the present invention is carried out furtherly below with reference to specific example
It is bright.
As shown in connection with fig. 1, it the present invention is directed to improve in metallurgical quality, shortening full form casting process process in casting, and mentions
A kind of new ferromagnetic alloy casting method out, is generally prepared by shell and fusion cast process technology is compound and alloy is molten
Casting with the moulding integrated casting technique combined of casting, using high-frequency vacuum electric induction furnace can induction heating fusing it is ferromagnetic
Property alloy, make crucible with prepared casting molding shell, by high-frequency vacuum electric induction furnace heat melted alloy in shell
Fusion cast process obtains casting.
Example as shown in Figure 1, it is proposed by the present invention without dewaxing, the short stream of ferromagnetic alloy vacuum casting without casting process
Journey casting method, includes the following steps：
Step 1, according to casting process scheme and the easy gasification, and combustion model material of selection, manufacture and design pattern molding processing
Mold；
Step 2, plastics apperance is manufactured with easy gasification, and combustion material using injection molding method；
Step 3, it is required according to casting Technology Design, step 2 gained plastics apperance is assembled into whole apperance；
Step 4, suitable binder and refractory material are selected according to technical conditions such as cast shape structure and casting alloys
Equal die casing materials, prepare surface layer slurry and backing layer slurry, whole mould obtained by the Conventional processing methods step 3 with model casting
Sample substitution wax-pattern prepares formwork, i.e., by coating, stucco, dry hardening obtain formwork；
Step 5, heat temperature raising speed, maturing temperature and time and type are determined according to model material and casting structure shape
Shell cooling velocity and the type of cooling, maturing temperature control are 5min~10min in 1100 DEG C~1200 DEG C, calcining time, will be walked
Rapid 4 gained formwork is roasted in resistance furnace, disappears to obtain shell mould using apperance gasification, and combustion；
Step 6, step 5 gained shell is cleared up and is examined, ensuring to require to claim after the assay was approved according to technique
Measured casting molding is packed into shell with alloy；
Step 7, induction heating founding will be carried out to get casting in the shell merging high-frequency vacuum induction furnace equipped with alloy.
Above scheme is preparing ferromagnetic alloy casting with significant advantage, is poured in technical process without conventional cast
Process avoids casting and fills Shell cracking caused by type and liquid alloy temperature loss problem, solves alloy melting and casting
Oxidization burning loss and air-breathing problem in the process, reduce model casting production process, energy-saving to subtract material, misrun, be mingled with it is gentle
Hole class defect is substantially reduced, and is improved in casting in metallurgical quality.
Each embodiment of the invention is more specifically introduced above-mentioned by taking automobile turbocharger turbine wheel as an example below
The specific implementation of technical process, but casting type is without being limited thereto, and summary of the invention is without being limited thereto, and specific implementation can be cast according to precision
Part size and shape structure and the difference of casting alloy use corresponding production technology.
【Embodiment one】
Using ferromagnetic alloy vacuum casting short route casting method of the invention, automobile turbocharger whirlpool is manufactured experimently
Impeller, such as J130B turbine wheel are taken turns, is included the following steps：
Step 1, according to impeller shape structure determination casting process scheme, 3, a type is in 120 ° in same horizontal plane position
It is uniformly distributed, model material uses polystyrene, manufactures and designs pattern molding processing mold.
Step 2, cylindrical charge swaging die sample is manufactured with polystyrene by injection molding method, casting forms inlet
Apperance and impeller casting apperance, charging swaging die sample and inlet apperance are integrated injection molding.
Step 3, cylindrical charge swaging die sample, casting molding inlet apperance and impeller casting apperance are set according to technique
Meter is required to assemble integral apperance and be modified.
Step 4, dip-coating surface layer slurry is successively carried out after whole apperance being assembled, and is got rid of slurry, is spread facing sand, is dry 26~28 small
When, so make surface layer；Surface layer carries out dip-coating backing layer slurry, stucco, drying 6~8 hours after the drying, and is repeated 2 times, and makes
Two layers of one layer of back and back；Then slurry seal, slurry seal slurry use backing layer slurry, spread vermiculite power after dipping, time control 2min~
Then 3min is dried 36~40 hours.Wherein, surface layer slurry refractory material uses zirconium English powder and fused quartz powder in mass ratio 5:
2 are matched, binder is silica solution, and surfactant uses paper pulp, and defoaming agent is silicone resin；Facing sand is selected and surface layer slurry
Refractory material is identical；Backing layer slurry refractory material is mullite powder, and binder is diluted using silica solution, the suitable distilled water of addition,
Stirred in being stained with pulp grinder 24 hours it is spare；Floor sand is selected consistent with backing layer slurry refractory material.
Step 5, after the sufficiently dry hardening of formwork, formwork is put into resistance furnace and carries out roasting and prepares shell, roasting plus
For the control of hot heating rate in 60 DEG C~80 DEG C/h, maturing temperature is 1150 DEG C, calcining time control after 8min, roasting shell with
Be furnace-cooled to 600 DEG C come out of the stove it is air-cooled.
Step 6, to shell carry out type chamber cleaning and quality inspection, after ensuring flawless, the cleaning of type chamber and noresidue
Load weighted nickel-base alloy is packed into shell.
Step 7, charging shell merging high-frequency vacuum induction furnace is subjected to heating founding, is cast after alloy cooled and solidified
Part.
Finally, we successively carry out the inspection of the casting qualities such as shake shell, abrasive jet cleaning and fluorescent penetrating inspection.
【Embodiment two】
Model casting produces automobile turbocharger turbine wheel J130B by the way of traditional, includes the following steps：
Step 1, according to impeller shape structure determination casting process scheme, 3, a type is in 120 ° in same horizontal plane position
It is uniformly distributed, designs running gate system, wax-pattern uses the waxed work of medium temperature, manufactures and designs forming die for wax pattern.
Step 2, make sprue cup, sprue, ingate and casting wax mould with medium temperature is waxed.
Step 3, it is required according to casting Technology Design, sprue cup, sprue, ingate and impeller casting apperance group is welded into
Whole wax-pattern group is simultaneously modified.
Step 3, the whole wax-pattern that group welds successively is subjected to dip-coating surface layer slurry, gets rid of slurry, spread facing sand, dry 26~28 small
When, make surface layer；Surface layer carries out dip-coating backing layer slurry, stucco, drying 6~8 hours after the drying, and is repeated 2 times, production back
One, two layers are carried on the back；Slurry seal slurry uses backing layer slurry, and vermiculite power is spread after dipping, and the time controls in 2min~3min, then dries 36
~40 hours.Wherein, surface layer slurry refractory material uses zirconium English powder and fused quartz powder in mass ratio 5:2 are matched, are bonded
Agent is that silica solution, surfactant use paper pulp, defoaming agent for silicone resin；Facing sand is selected identical as surface layer slurry refractory material；
Backing layer slurry refractory material is mullite powder, binder using silica solution, the suitable distilled water dilution of addition, is stirred in being stained with pulp grinder
24 hours spare；Floor sand is selected consistent with backing layer slurry refractory material.
Step 5, after the sufficiently dry hardening of formwork, formwork is put into dewaxing kettle and carries out fusible pattern dewaxing acquisition silica solution type
Shell, dewaxing temperature are 170 DEG C, soaking time 15min.
Step 6, shell is put into resistance furnace after dewaxing to roast, baking heat heating rate is controlled 60 DEG C~80
DEG C/h, maturing temperature be 1150 DEG C, calcining time control after 8min, roasting shell be furnace-cooled to 600 DEG C come out of the stove it is air-cooled.
Step 7, to shell carry out type chamber cleaning and quality inspection, it is ensured that shell flawless, the cleaning of type chamber and noresidue.
Step 8, Baking is ensured to be poured at high temperature to 1150 DEG C~1200 DEG C by molten alloy, to be poured
Enter after alloy cooled and solidified up to casting, then successively carries out the inspection of the casting qualities such as shake shell, abrasive jet cleaning and fluorescent penetrating inspection.
【Embodiment three】
Using ferromagnetic alloy vacuum casting short route casting method of the invention, automobile turbocharger whirlpool is manufactured experimently
Impeller, such as K418superalloy SJ50 turbine wheel are taken turns, is included the following steps：
Step 1, according to impeller shape structure determination casting process scheme, 6, a type is distributed in two different level positions
It sets, each horizontal plane position 3 are uniformly distributed in 120 °, and casting is in 60 ° of cross arrangements, mould on two different level positions
Sample material uses polyethylene, manufactures and designs pattern molding processing mold.
Step 2, cylindrical charge swaging die sample, casting molding injection mouth mold are manufactured with polyethylene by injection molding method
Sample and impeller casting apperance, charging swaging die sample and inlet apperance are integrated injection molding.
Step 3, cylindrical charge swaging die sample, casting molding inlet apperance and impeller casting apperance are set according to technique
Meter is required to assemble integral apperance and be modified.
Step 4, dip-coating surface layer slurry is successively carried out after whole apperance being assembled, and is got rid of slurry, is spread facing sand, is dry 22~25 small
When, make surface layer；Surface layer carries out dip-coating backing layer slurry, stucco, drying 5~7 hours after the drying, and is repeated 2 times, production back
One, two layers are carried on the back；Slurry seal slurry uses backing layer slurry, and vermiculite power is spread after dipping, and the time controls in 2min~3min, then dries 32
~36 hours.Wherein, surface layer slurry refractory material uses zirconium English powder and fused quartz powder in mass ratio 6:3 are matched, are bonded
Agent is that silica solution, surfactant use paper pulp, defoaming agent for silicone resin；Facing sand is selected identical as surface layer slurry refractory material；
Backing layer slurry refractory material is mullite powder, binder using silica solution, the suitable distilled water dilution of addition, is stirred in being stained with pulp grinder
24 hours spare；Floor sand is selected consistent with backing layer slurry refractory material.
Step 5, after the sufficiently dry hardening of formwork, formwork is put into resistance furnace and carries out roasting and prepares shell, roasting plus
For the control of hot heating rate in 60 DEG C~80 DEG C/h, maturing temperature is 1100 DEG C, calcining time control after 6min, roasting shell with
Be furnace-cooled to 600 DEG C come out of the stove it is air-cooled.
Step 6, to shell carry out type chamber cleaning and quality inspection, after ensuring flawless, the cleaning of type chamber and noresidue
Load weighted K418superalloy alloy is packed into shell.
Step 7, charging shell merging high-frequency vacuum induction furnace is subjected to heating founding, is cast after alloy cooled and solidified
Part.
Finally, we can also successively carry out the quality inspections such as shake shell, abrasive jet cleaning and fluorescent penetrating inspection.
【Example IV】
Using traditional approach model casting automobile turbocharger turbine wheel K418superalloy SJ50, including with
Lower step：
Step 1, according to impeller shape structure determination casting process scheme, 6, a type is distributed in two different level positions
It sets, each horizontal plane position 3 are uniformly distributed in 120 °, and casting is in 60 ° of cross arrangements on two different level positions, if
Running gate system is counted, wax-pattern uses the waxed work of medium temperature, manufactures and designs forming die for wax pattern.
Step 2, make sprue cup, sprue, ingate and casting wax mould with medium temperature is waxed.
Step 3, it is required according to casting Technology Design, sprue cup, sprue, ingate and impeller casting apperance group is welded into
Whole wax-pattern group is simultaneously modified.
Step 4, formwork just is prepared with the Conventional processing methods of model casting after whole apperance being assembled, is successively carried out
Dip-coating surface layer slurry gets rid of slurry, spreads facing sand, is 22~25 hours dry, makes surface layer；Surface layer carries out dip-coating backing layer material after the drying
Slurry, stucco, drying 5~7 hours, and be repeated 2 times, production back one, two layers of back；Slurry seal slurry uses backing layer slurry, spreads after dipping
Vermiculite power, time control in 2min~3min, then dry 32~36 hours.Wherein, surface layer slurry refractory material uses zirconium English
Powder and fused quartz powder in mass ratio 6:3 are matched, binder be silica solution, surfactant use paper pulp, defoaming agent for
Silicone resin；Facing sand is selected identical as surface layer slurry refractory material；Backing layer slurry refractory material is mullite powder, binder is molten using silicon
Glue, addition suitable distilled water dilution, stirred in being stained with pulp grinder 24 hours it is spare；Floor sand is selected and backing layer slurry refractory material one
It causes.
Step 5, after the sufficiently dry hardening of formwork, formwork is put into dewaxing kettle and carries out fusible pattern dewaxing acquisition silica solution type
Shell, dewaxing temperature are 170 DEG C, soaking time 15min.
Step 6, shell is put into resistance furnace after dewaxing to roast, baking heat heating rate is controlled 60 DEG C~80
DEG C/h, maturing temperature be 1100 DEG C, calcining time control after 6min, roasting shell be furnace-cooled to 600 DEG C come out of the stove it is air-cooled.
Step 7, to shell carry out type chamber cleaning and quality inspection, it is ensured that shell flawless, the cleaning of type chamber and noresidue.
Step 8, Baking is ensured to be poured at high temperature to 1150 DEG C~1200 DEG C by molten alloy, to be poured
Enter after alloy cooled and solidified up to casting, then successively carries out the inspection of the casting qualities such as shake shell, abrasive jet cleaning and fluorescent penetrating inspection.
In above-mentioned specific example, ferromagnetic alloy vacuum casting short route casting method of the invention is respectively adopted
Two kinds of car model turbocharger turbine wheels have been produced in batches with investment casting method, and production comparing result shows this hair
Bright process not only simplifies production operation compared with model casting, and is obviously improved casting quality.Although casting master
Want casting flaw be all deformation, misrun, be mingled with stomata class defect, but it is useless using the casting that process of the invention produces
Product rate is substantially reduced.Table 1 is impeller casting rejection rate statistical result in specific implementation.
The comparison of 1 impeller casting rejection rate of table
It can be seen in table 1 that more real than traditional model casting using the embodiment of the present invention one and three rate of wasted casting product of embodiment
It applies example two and example IV is substantially reduced, embodiment one impeller J130B rate of wasted casting product reduces by 5.1%, only embodiment two
40.7%, embodiment trilobed wheel SJ50 rate of wasted casting product only has the 40.2% of example IV, and rate of wasted casting product reduces by 5.5%.
It is also seen that embodiment one and three rate of wasted casting product of embodiment are more significant than embodiment two and example IV from table 1
Reduction is due to casting deformation, misrun, is mingled with and is greatly reduced with stomata class defect.Casting deformation is mainly and apperance is de-
It deforms in mould, transport, assembly and formwork preparation process related, misrun is caused by Shell cracking as a result, and implementing real
Example one and three casting of embodiment are mingled with, embodiment two mainly of low quality related with base material alloy metallurgy with stomata class waste product
Be mingled with four casting of embodiment with stomata class waste product is then mainly that alloy melting oxidization burning loss and casting are filled caused by type air-breathing.
The above results show compound shell provided by the invention preparation and fusion cast process technology and alloy casting and casting at
The casting technique that type integration combines has apparent technical advantage, and good technology effect is achieved in production application
Fruit and economic benefit.Since plastics apperance is hardly damaged and deforms in demoulding, assembly and formwork preparation process, wax-pattern is avoided
Deformation leads to casting scrap problem, alloy casting and casting is moulding integrated solves alloy melting oxidization burning loss and type is filled in casting
The problems such as caused Shell cracking and air-breathing, improves in metallurgical quality in casting, and casting yield is high.
Illustrated by above technical scheme and comparative example as it can be seen that the present invention is compound using shell preparation and fusion cast process technology
Casting technique, it is no to dewax, without casting production operation, shorten technical process for casting, is applicable in nickel-base alloy nickel-base alloy impeller
Deng the demanding ferromagnetic alloy precision casting production of inherent metallurgical quality, casting structure complexity is unrestricted, avoids
Traditional model casting wax-pattern deforms in demoulding, transport, assembly and formwork preparation process and is poured liquid alloy in cavity filling process
Temperature loss problem solves model casting alloy melting oxidization burning loss, fusible pattern dewaxing and casting and fills Shell cracking caused by type
And the problems such as air-breathing, defect significantly reduce, casting yield is high.
Moreover, being formed and being used using prepared casting using alloy casting and the moulding integrated casting technique of casting
Shell makees crucible, is cast by melting ferromagnetic alloy fusion cast process in shell with high-frequency vacuum electric induction furnace induction heating
Part solves the problems, such as that model casting is also easy to produce oxidization burning loss and air-breathing in alloy melting and casting process, and casting is mingled with gentle
Hole class defect significantly reduces, and improves in casting in metallurgical quality.
Meanwhile using high-frequency vacuum electric induction furnace can induction heating melt ferromagnetic alloy, using shell preparation and founding
Compound and alloy casting is formed with the moulding integrated casting technique combined of casting, simplifies production process, it is energy-saving
Subtract material, improve casting quality, is suitable in production part in the demanding ferromagnetic alloy precision casting of metallurgical quality.
Misrun is mingled with and significantly reduces with stomata class defect, and casting dimension accuracy, inherent metallurgical quality and surface quality are equal
It is significantly improved than traditional model casting.
Claims (6)
1. a kind of ferromagnetic alloy vacuum casting short route casting method, which is characterized in that include the following steps：
Step 1, according to the easy gasification, and combustion model material of casting process scheme and selection, determine manufacture pattern molding processing mould
Tool；
Step 2 manufactures plastics apperance with easy gasification, and combustion material using injection molding method；
Step 2 gained plastics apperance is assembled into whole apperance by step 3；
Step 4 determines die casing material according to cast shape structure and casting alloy, surface layer and backing layer is prepared, with model casting
Conventional processing methods steps 3 obtained by whole apperance substitution wax-pattern prepare formwork, i.e., by coating, stucco, dry hardening
Obtain formwork；
Step 5 determines that heat temperature raising speed, maturing temperature and time and shell are cold according to model material and casting structure shape
But speed and the type of cooling roast step 4 gained formwork in resistance furnace, disappear to obtain shell using apperance gasification, and combustion
Type；
Step 6 is cleared up and is examined to step 5 gained shell, is ensuring to require to weigh according to technique after the assay was approved
Casting molding with alloy be packed into shell；
Step 7 will carry out induction heating founding in the shell merging high-frequency vacuum induction furnace equipped with alloy to get casting.
2. ferromagnetic alloy vacuum casting short route casting method according to claim 1, which is characterized in that described
In step 5, maturing temperature control is 5min~10min in 1100 DEG C~1200 DEG C, calcining time.
3. ferromagnetic alloy vacuum casting short route casting method according to claim 1, which is characterized in that described
During step 4 makes formwork, the die casing material of surface layer and backing layer includes：Surface layer slurry refractory material uses zirconium English powder and melting
Silica flour in mass ratio 6:3 are matched, and binder is silica solution, and surfactant uses paper pulp, and defoaming agent is silicone resin, face
Sand is selected identical as surface layer slurry refractory material；Backing layer slurry refractory material is mullite powder, and binder is suitable using silica solution, addition
The distilled water of amount dilutes, stirred in being stained with pulp grinder 24 hours it is spare；Floor sand is selected consistent with backing layer slurry refractory material.
4. ferromagnetic alloy vacuum casting short route casting method described in any one of -3 according to claim 1,
It is characterized in that, the casting is automobile turbocharger turbine wheel.
5. ferromagnetic alloy vacuum casting short route casting method according to claim 4, which is characterized in that described
In step 2, cylindrical charge swaging die sample is manufactured with polyethylene by injection molding method, casting forms inlet apperance and leaf
Casting form is taken turns, charging swaging die sample and inlet apperance are integrated injection molding.
6. ferromagnetic alloy vacuum casting short route casting method according to claim 5, which is characterized in that in step
In rapid 3, cylindrical charge swaging die sample, casting molding inlet apperance and impeller casting apperance are assembled into integral apperance and gone forward side by side
Row finishing.
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| CN201810842573.7A CN108889924B (en) | 2018-07-27 | 2018-07-27 | Short-flow precision casting method for ferromagnetic alloy vacuum casting |
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| CN108889924B CN108889924B (en) | 2020-07-10 |
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| CN111545710A (en) * | 2020-05-13 | 2020-08-18 | 南京工程学院 | Technological method and system for precisely casting refined grains and tissues of nickel-based superalloy |
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| CN108889924B (en) | 2020-07-10 |
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