CN102019353A - Precision casting molding method for complex thin-walled member - Google Patents
Precision casting molding method for complex thin-walled member Download PDFInfo
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- CN102019353A CN102019353A CN2010105937760A CN201010593776A CN102019353A CN 102019353 A CN102019353 A CN 102019353A CN 2010105937760 A CN2010105937760 A CN 2010105937760A CN 201010593776 A CN201010593776 A CN 201010593776A CN 102019353 A CN102019353 A CN 102019353A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005495 investment casting Methods 0.000 title claims abstract description 13
- 238000000465 moulding Methods 0.000 title abstract description 3
- 239000004576 sand Substances 0.000 claims abstract description 42
- 238000005266 casting Methods 0.000 claims abstract description 30
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 230000004907 flux Effects 0.000 claims description 35
- 238000009415 formwork Methods 0.000 claims description 29
- 238000007670 refining Methods 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- 239000004411 aluminium Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 10
- 238000003801 milling Methods 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 5
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000008602 contraction Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a precision casting molding method for a complex thin-walled member. The method comprises the following steps of: 1) manufacturing a wax die; 2) pressing the wax die; 3) designing and manufacturing a pouring system; 4) forming: bonding the wax die pressed in the step 2) and a sprue cup, a cross gate, a sprue and an in-gate pressed in the step 3) by adopting liquid wax to form a whole; 5) coating sand; 6) roasting a die shell: roasting the die shell in a box-type electric resistance furnace, taking out the die shell after the roasting is finished, and cleaning residues in the cavity of the die shell; 7) smelting and casting; 8) clearing a casting; and 9) obtaining a complex thin-walled member product after thermal treatment. A nuclear reactor tube seat close to the required geometric dimension is obtained by adopting a direct casting mode in the method; and the manufacture of the tube seat can be finished only by a little machining operation after the method is adopted, so the manufacturing cost of the tube seat is remarkably reduced.
Description
Technical field
The invention belongs to the metal casting technology, particularly a kind of hot investment casting forming method, especially a kind of hot investment casting forming method that is applicable to the complex thin-wall foundry goods.
Background technology
Its bottom of base has more than 100 a special-shaped discharge orifice and installing hole on the nuclear fuel reactor, wall thickness 2～3mm between any two holes, and the high 18～24mm of hole wall, and the base top has four thick big pins, belongs to typical complex thin-wall member.At present, base generally adopts the monoblock stainless steel to process through accurate digital control on the nuclear reactor, causes that metal material waste is serious, production efficiency is low, yield rate is low, consumes a large amount of energy and man-hour, this not only makes the cost of base high especially, and can not guarantee to produce the difficult problem of urgent need.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of hot investment casting forming method of complex thin-wall spare is provided, this method adopts the directly mode of casting, obtain nuclear reactor base near the physical dimension that requires, through only needing a small amount of machining can finish the base manufacturing after this method, its manufacturing cost is significantly reduced.
The objective of the invention is to solve by the following technical programs:
The hot investment casting forming method of this complex thin-wall spare may further comprise the steps:
1) Wax mold manufacturing:
Structure fabrication metal Wax mold according to complex thin-wall spare;
2) compacting wax-pattern:
The Wax mold that adopts previous step to make utilizes wax injector compacting complex thin-wall spare wax-pattern, 70～80 ℃ of press temperatures, pressing pressure 0.4～0.7MPa;
3) Design of Runner System and making:
Adopt wax injector to suppress cup, cross cross gate, sprue and ingate respectively;
4) group type:
Adopt liquid wax with the 2nd) wax-pattern and the 3rd of step compacting) cup, cross cross gate, sprue and the ingate of step compacting bond, and forms whole;
5) hang sand:
Above integral body is carried out multilayer hang sand, hang and obturage with slurry after sand is finished, form formwork;
6) formwork roasting:
Roasting formwork in chamber type electric resistance furnace takes out formwork cleaning inner chamber residue after roasting is finished;
7) melting and cast:
Remelting stainless steel finished product ingot casting after the fusing is poured molten steel into and is carried out casting pouring in the casting ladle, before the cast with the formwork preheating in order to cast;
8) casting cleaning:
Adopt clear shell of waterpower or the clear shell of dried blast; Adopt sawing machine cutting cast, ingate adopts the milling machine milling to the foundry goods plane, adopts blowing machine to carry out blast;
9) heat treatment:
Foundry goods after the cleaning is heat-treated in heat treatment salt bath or chamber type electric resistance furnace, make complex thin-wall spare finished product after finishing.
Above-mentioned steps 5) in, when multilayer is hung sand, at first carries out hanging first time sand, carry out second to four layer of extension sand with shop sand and slurry on 35 purposes again after dry 8～16 hours, hung behind the sand at least drying 4～8 hours at every turn with 70 order emergies and slurry; Shop sand and slurry are hung and to be put into drying at least 4～8 hour behind the sand on the 5th to eight layer of usefulness 20 order.
Above-mentioned steps 6) in, during the roasting formwork, resistance furnace is warming up to 450～500 ℃, the formwork of preparing roasting is put into stove, continue to be warming up to 800～1100 ℃ of insulations 1～3 hour, the stove that has a power failure then is chilled to 200 ℃.
Above-mentioned steps 7) in, fusing is preceding in mass percent concentration, at first weighing 0.13～0.17% silicon calcium powder is as the diffusion deoxidizer in refining period, 0.08%～0.12% aluminium block is made deoxidier in the stove, 0.08%～0.12% silico-calcium piece is done the ladle deoxidation agent, with R6 is flux, through 850～950 ℃ of baking 3h; Refining is with adding 15%～25% silicon calcium powder in the flux; At first add R6 flux during fusing at furnace bottom, furnace burdening again, ferromanganese and ferrochrome are packed in the stove with the matrix furnace charge during molten alloy; With the peak power fusing, the back of becoming civilized adds flux and covers, and skims after the running down, adds new flux again, treats that new slag forms the back and keeps 10～20min, skims again; Add refining agent after skimming, carry out diffusive deoxidation, refining divides 3～4 times with flux, should stir slag liquid after each the adding, and refining time is controlled in 30～40min; When molten steel temperature reaches 1580～1590 ℃, insert 0.08% aluminium deoxidizer, treat reactive aluminum after, cover the molten steel surface adding flux; When molten steel temperature is raised to 1590～1640 ℃, skim, in the magnesia casting ladle of 15kg, add 0.1% silicon calcium powder.
Above-mentioned steps 9) in, foundry goods is quenched after 30 minutes 1050～1100 ℃ of insulations, cooling medium is a water, and the time of transferring to from stove in the water is not more than 25 seconds.
The present invention has following beneficial effect:
The present invention adopts the method for hot investment casting moulding to substitute the mach method of whole block material and produces the nuclear reactor base, only a small amount of machine cut of need is processed or is only carried out grinding and can finish production, not only save lot of materials, improve work efficiency, and can effectively improve the product price ratio, can produce great economic benefit.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is a Design of Runner System scheme of the present invention.
Among the figure, 1 is cup; 2 is the cross cross gate; 3 is sprue; 4 is ingate.
The specific embodiment
Below in conjunction with embodiment the present invention is done and to describe in further detail:
Embodiment 1
Present embodiment carries out according to process chart shown in Figure 1, step specific as follows:
1) Wax mold design and making: according to base design on the nuclear reactor and make the metal Wax mold, on concrete be determine pattern draft be 3 ', the foundry goods amount of contraction is 1.5%;
2) compacting wax-pattern: the Wax mold and the wax injector that adopt previous step to make are suppressed base wax-pattern on the nuclear reactor, 70 ℃ of press temperatures, pressing pressure 0.4MPa;
3) Design of Runner System and making: the running gate system structure adopts above-mentioned cup 1, cross cross gate 2, sprue 3 and the ingate 4 suppressed respectively of wax injector compacting as shown in Figure 2;
4) group type: adopt liquid wax with the 2nd) cup 1, cross cross gate 2, sprue 3 and the ingate 4 of the wax-pattern of step compacting and the compacting of the 3rd step bond according to structure shown in Figure 2, form whole;
5) hang sand: carry out hanging first time sand with 70 order emergies and slurry, carry out second to four layer of extension sand with shop sand and slurry on 35 purposes again after dry 8 hours, hung behind the sand at least drying 4 hours at every turn; Put into drying at least 4 hours after shop sand and slurry are hung sand on the 5th to eight layer of usefulness 20 order; Obturage with slurry at last;
6) formwork roasting: roasting formwork in chamber type electric resistance furnace, resistance furnace is warming up to 450 ℃, the formwork of preparing roasting is put into stove, continue to be warming up to 800 ℃ of insulations 1 hour, the stove that has a power failure then is chilled to 200 ℃; Take out formwork cleaning inner chamber residue; Before the cast cast is prepared against in the formwork preheating;
7) melting and cast: adopt qualified stainless steel finished product ingot casting to carry out remelting; In mass percent concentration, at first weighing 0.13% silicon calcium powder is as the diffusion deoxidizer in refining period before the fusing, and 0.08% aluminium block is made deoxidier in the stove, and 0.08% silico-calcium piece is done the ladle deoxidation agent.Prepare R6 flux, through 850 ℃ of baking 3h.Refining is with adding 15% silicon calcium powder in the flux.At first add R6 flux during fusing at furnace bottom, furnace burdening again, ferromanganese and ferrochrome are packed in the stove with the matrix furnace charge during molten alloy.With the peak power fusing, the back of becoming civilized adds flux and covers, and skims after the running down, adds new flux again, treats that new slag forms the back and keeps 10min, skims again.Add refining agent after skimming, carry out diffusive deoxidation, refining divides 3 times with flux, should stir slag liquid after each the adding, and refining time is controlled in the 30min.When molten steel temperature reaches 1580 ℃, insert 0.08% aluminium deoxidizer, treat reactive aluminum after, cover the molten steel surface adding flux.When molten steel temperature is raised to 1590 ℃, skim, in the magnesia casting ladle of 15kg, add 0.1% silicon calcium powder, molten steel is poured into carried out casting pouring in the casting ladle;
8) casting cleaning: adopt clear shell of waterpower or the clear shell of dried blast; Adopt sawing machine cutting running gate system, ingate adopts the milling machine milling to the foundry goods plane, adopts blowing machine to carry out blast;
9) heat treatment: the nuclear reactor base after will clearing up is heat-treated in heat treatment salt bath or chamber type electric resistance furnace.The nuclear reactor base quenches after 30 minutes 1050 ℃ of insulations, and cooling medium is a water, and the time of transferring to from stove in the water is not more than 25 seconds; Make complex thin-wall spare finished product after finishing.
After x-ray inspection, internal soundness meets the requirements prescribed to the above casting finished products that makes, and the result is as follows after the Mechanics Performance Testing:
| Test item | Hot strength (σ b) | Yield strength (σ 0.2) | Percentage elongation (δ 4D) |
| 1 #Sample | ?577 | ?286 | 56 |
| 2 #Sample | ?578 | ?307 | 58.1 |
Embodiment 2:
1) Wax mold design and making: according to base design on the nuclear reactor and make the metal Wax mold, be to determine that pattern draft is 1.5 ° on concrete, the foundry goods amount of contraction is 2.3%;
2) compacting wax-pattern: the Wax mold and the wax injector that adopt previous step to make are suppressed base wax-pattern on the nuclear reactor, 75 ℃ of press temperatures, pressing pressure 0.55MPa;
3) Design of Runner System and making: the running gate system structure adopts above-mentioned cup 1, cross cross gate 2, sprue 3 and the ingate 4 suppressed respectively of wax injector compacting as shown in Figure 2;
4) group type: adopt liquid wax with the 2nd) cup 1, cross cross gate 2, sprue 3 and the ingate 4 of the wax-pattern of step compacting and the compacting of the 3rd step bond according to the structure shown in the accompanying drawing 2, form whole;
5) hang sand: carry out hanging first time sand with 70 order emergies and slurry, carry out second to four layer of extension sand with shop sand and slurry on 35 purposes again after dry 12 hours, hung behind the sand at least drying 6 hours at every turn; Put into drying at least 6 hours after shop sand and slurry are hung sand on the 5th to eight layer of usefulness 20 order; Obturage with slurry at last;
6) formwork roasting: roasting formwork in chamber type electric resistance furnace, resistance furnace is warming up to 475 ℃, the formwork of preparing roasting is put into stove, continue to be warming up to 950 ℃ of insulations 2 hours, the stove that has a power failure then is chilled to 200 ℃; Take out formwork cleaning inner chamber residue; Before the cast cast is prepared against in the formwork preheating;
7) melting and cast: adopt qualified stainless steel finished product ingot casting to carry out remelting; At first weighing 0.13～0.17% silicon calcium powder is as the diffusion deoxidizer in refining period before the fusing, and 0.1% aluminium block is made deoxidier in the stove, and 0.1% silico-calcium piece is done the ladle deoxidation agent.Prepare R6 flux, through 900 ℃ of baking 3h.Refining is with adding 20% silicon calcium powder in the flux.At first add R6 flux during fusing at furnace bottom, furnace burdening again, ferromanganese and ferrochrome are packed in the stove with the matrix furnace charge during molten alloy.With the peak power fusing, the back of becoming civilized adds flux and covers, and skims after the running down, adds new flux again, treats that new slag forms the back and keeps 15min, skims again.Add refining agent after skimming, carry out diffusive deoxidation, refining divides 3～4 times with flux, should stir slag liquid after each the adding, and refining time is controlled in the 35min.When molten steel temperature reaches 1585 ℃, insert 0.08% aluminium deoxidizer, treat reactive aluminum after, cover the molten steel surface adding flux.When molten steel temperature is raised to 1610 ℃, skim, in the magnesia casting ladle of 15kg, add 0.1% silicon calcium powder, molten steel is poured into carried out casting pouring in the casting ladle;
8) casting cleaning: adopt clear shell of waterpower or the clear shell of dried blast; Adopt sawing machine cutting running gate system, ingate adopts the milling machine milling to the foundry goods plane, adopts blowing machine to carry out blast;
9) heat treatment: the nuclear reactor base after will clearing up is heat-treated in heat treatment salt bath or chamber type electric resistance furnace.The nuclear reactor base quenches after 30 minutes 1075 ℃ of insulations, and cooling medium is a water, and the time of transferring to from stove in the water is not more than 25 seconds;
After x-ray inspection, internal soundness meets the requirements prescribed with the above finished product cast that makes, and the result is as follows after the Mechanics Performance Testing:
| Test item | Hot strength (σ b) | Yield strength (σ 0.2) | Percentage elongation (δ 4D) |
| 1 #Sample | 610 | 300 | 59 |
| 2 #Sample | 610 | 309 | 63 |
Embodiment 3:
1) Wax mold design and making: according to base design on the nuclear reactor and make the metal Wax mold, be to determine that pattern draft is 3 ° on concrete, the foundry goods amount of contraction is 3%;
2) wax-pattern compacting: the Wax mold and the wax injector that adopt previous step to make are suppressed base wax-pattern on the nuclear reactor, 80 ℃ of press temperatures, pressing pressure 0.7MPa;
3) Design of Runner System and making: the running gate system structure adopts above-mentioned cup 1, cross cross gate 2, sprue 3 and the ingate 4 suppressed respectively of wax injector compacting as shown in Figure 2;
4) group type: adopt liquid wax with the 2nd) cup 1, cross cross gate 2, sprue 3 and the ingate 4 of the wax-pattern of step compacting and the compacting of the 3rd step bond according to the structure shown in the accompanying drawing 2, form whole;
5) hang sand: carry out hanging first time sand with 70 order emergies and slurry, carry out second to four layer of extension sand with shop sand and slurry on 35 purposes again after dry 16 hours, hung behind the sand at least drying 8 hours at every turn; Put into drying at least 8 hours after shop sand and slurry are hung sand on the 5th to eight layer of usefulness 20 order; Obturage with slurry at last;
6) formwork roasting: roasting formwork in chamber type electric resistance furnace, resistance furnace is warming up to 500 ℃, the formwork of preparing roasting is put into stove, continue to be warming up to 1100 ℃ of insulations 3 hours, the stove that has a power failure then is chilled to 200 ℃; Take out formwork cleaning inner chamber residue; Before the cast cast is prepared against in the formwork preheating;
7) melting and cast: adopt qualified stainless steel finished product ingot casting to carry out remelting; At first weighing 0.17% silicon calcium powder is as the diffusion deoxidizer in refining period before the fusing, and 0.12% aluminium block is made deoxidier in the stove, and 0.12% silico-calcium piece is done the ladle deoxidation agent.Prepare R6 flux, through 950 ℃ of baking 3h.Refining is with adding 25% silicon calcium powder in the flux.At first add R6 flux during fusing at furnace bottom, furnace burdening again, ferromanganese and ferrochrome are packed in the stove with the matrix furnace charge during molten alloy.With the peak power fusing, the back of becoming civilized adds flux and covers, and skims after the running down, adds new flux again, treats that new slag forms the back and keeps 20min, skims again.Add refining agent after skimming, carry out diffusive deoxidation, refining divides 3～4 times with flux, should stir slag liquid after each the adding, and refining time is controlled in the 40min.When molten steel temperature reaches 1590 ℃, insert 0.08% aluminium deoxidizer, treat reactive aluminum after, cover the molten steel surface adding flux.When molten steel temperature is raised to 1640 ℃, skim, in the magnesia casting ladle of 15kg, add 0.1% silicon calcium powder, molten steel is poured into carried out casting pouring in the casting ladle;
8) casting cleaning: adopt clear shell of waterpower or the clear shell of dried blast; Adopt sawing machine cutting running gate system, ingate adopts the milling machine milling to the foundry goods plane, adopts blowing machine to carry out blast;
9) heat treatment: the nuclear reactor base after will clearing up is heat-treated in heat treatment salt bath or chamber type electric resistance furnace.The nuclear reactor base quenches after 30 minutes 1100 ℃ of insulations, and cooling medium is a water, and the time of transferring to from stove in the water is not more than 25 seconds;
10) foundry goods is after x-ray inspection, and internal soundness meets the requirements prescribed, and the result is as follows after the Mechanics Performance Testing:
| Test item | Hot strength (σ | Yield strength (σ 0.2) | Percentage elongation (δ 4D) |
| 1 #Sample | 585 | 294 | 64 |
| 2 #Sample | 570 | 303 | 65 |
Claims (5)
1. the hot investment casting forming method of a complex thin-wall spare is characterized in that, may further comprise the steps:
1) Wax mold manufacturing:
Structure fabrication metal Wax mold according to complex thin-wall spare;
2) compacting wax-pattern:
The Wax mold that adopts previous step to make utilizes wax injector compacting complex thin-wall spare wax-pattern, 70～80 ℃ of press temperatures, pressing pressure 0.4～0.7MPa;
3) Design of Runner System and making:
Adopt wax injector to suppress cup (1), cross cross gate (2), sprue (3) and ingate (4) respectively;
4) group type:
Adopt liquid wax with the 2nd) wax-pattern and the 3rd of step compacting) cup (1), cross cross gate (2), sprue (3) and the ingate (4) of step compacting bond, and forms whole;
5) hang sand:
Above integral body is carried out multilayer hang sand, hang and obturage with slurry after sand is finished, form formwork;
6) formwork roasting:
Roasting formwork in chamber type electric resistance furnace takes out formwork cleaning inner chamber residue after roasting is finished;
7) melting and cast:
Remelting stainless steel finished product ingot casting after the fusing is poured molten steel into and is carried out casting pouring in the casting ladle, before the cast with the formwork preheating in order to cast;
8) casting cleaning:
Adopt clear shell of waterpower or the clear shell of dried blast; Adopt sawing machine cutting cast, ingate adopts the milling machine milling to the foundry goods plane, adopts blowing machine to carry out blast;
9) heat treatment:
Foundry goods after the cleaning is heat-treated in heat treatment salt bath or chamber type electric resistance furnace, make complex thin-wall spare finished product after finishing.
2. according to the hot investment casting forming method of the described complex thin-wall spare of claim 1, it is characterized in that, in the step 5), when multilayer is hung sand, at first carry out hanging the first time sand with 70 order emergies and slurry, carry out second to four layer with shop sand and slurry on 35 purposes again after dry 8～16 hours and hang sand, hung behind the sand at least drying 4～8 hours at every turn; Shop sand and slurry are hung and to be put into drying at least 4～8 hour behind the sand on the 5th to eight layer of usefulness 20 order.
3. according to the hot investment casting forming method of the described complex thin-wall spare of claim 1, it is characterized in that, in the step 6), during the roasting formwork, resistance furnace is warming up to 450～500 ℃, the formwork of preparing roasting is put into stove, continue to be warming up to 800～1100 ℃ of insulations 1～3 hour, the stove that has a power failure then is chilled to 200 ℃.
4. according to the hot investment casting forming method of the described complex thin-wall spare of claim 1, it is characterized in that, in the step 7), fusing is preceding in mass percent concentration, at first weighing 0.13～0.17% silicon calcium powder is as the diffusion deoxidizer in refining period, and 0.08%～0.12% aluminium block is made deoxidier in the stove, and 0.08%～0.12% silico-calcium piece is done the ladle deoxidation agent, with R6 is flux, through 850～950 ℃ of baking 3h; Refining is with adding 15%～25% silicon calcium powder in the flux; At first add R6 flux during fusing at furnace bottom, furnace burdening again, ferromanganese and ferrochrome are packed in the stove with the matrix furnace charge during molten alloy; With the peak power fusing, the back of becoming civilized adds flux and covers, and skims after the running down, adds new flux again, treats that new slag forms the back and keeps 10～20min, skims again; Add refining agent after skimming, carry out diffusive deoxidation, refining divides 3～4 times with flux, should stir slag liquid after each the adding, and refining time is controlled in 30～40min; When molten steel temperature reaches 1580～1590 ℃, insert 0.08% aluminium deoxidizer, treat reactive aluminum after, cover the molten steel surface adding flux; When molten steel temperature is raised to 1590～1640 ℃, skim, in the magnesia casting ladle of 15kg, add 0.1% silicon calcium powder.
5. according to the hot investment casting forming method of the described complex thin-wall spare of claim 1, it is characterized in that in the step 9), foundry goods is quenched after 30 minutes 1050～1100 ℃ of insulations, cooling medium is a water, the time of transferring to from stove in the water is not more than 25 seconds.
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| CN102717029A (en) * | 2012-06-14 | 2012-10-10 | 西安西工大超晶科技发展有限责任公司 | Casting method for large thin-wall shell aluminium alloy casting |
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| CN104353784A (en) * | 2014-10-31 | 2015-02-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Precision casting method for complex thin-wall structural member framework of high-temperature alloy cavity |
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| CN106736292A (en) * | 2016-12-28 | 2017-05-31 | 中核北方核燃料元件有限公司 | A kind of advanced pressurized water reactor fuel element base machining process |
| CN108057844A (en) * | 2017-12-20 | 2018-05-22 | 西安西工大超晶科技发展有限责任公司 | A kind of manufacturing method of fuel assembly for nuclear reactor bottom nozzle |
| CN108213394A (en) * | 2017-12-28 | 2018-06-29 | 中核北方核燃料元件有限公司 | A kind of fuel element tube socket casting method |
| CN109590436A (en) * | 2018-12-13 | 2019-04-09 | 中核北方核燃料元件有限公司 | A kind of nuclear fuel tube socket precision mold and casting method |
| CN110918887A (en) * | 2019-11-28 | 2020-03-27 | 鹰普机械（宜兴）有限公司 | Investment casting method of automobile parts based on components of duplex stainless steel and heat treatment process |
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