CN110180994A - A kind of preparation method of the elongated blind hole investment-casting shell of band - Google Patents
A kind of preparation method of the elongated blind hole investment-casting shell of band Download PDFInfo
- Publication number
- CN110180994A CN110180994A CN201910551439.6A CN201910551439A CN110180994A CN 110180994 A CN110180994 A CN 110180994A CN 201910551439 A CN201910551439 A CN 201910551439A CN 110180994 A CN110180994 A CN 110180994A
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- Prior art keywords
- wax
- coated
- blind hole
- pattern
- shell
- Prior art date
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- 238000005495 investment casting Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005266 casting Methods 0.000 claims abstract description 50
- 238000001035 drying Methods 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- 238000007605 air drying Methods 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052726 zirconium Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 6
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 6
- 238000004321 preservation Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of preparation methods of the elongated blind hole investment-casting shell of band, include the following steps；1. making the wax-pattern of wax-pattern thin stick and ontology casting, the thin stick diameter of wax-pattern is less than ontology casting blind hole diameter, and length is greater than ontology casting blind hole length；2. the thin stick of pair wax-pattern is coated with shell；3. injecting plastic refractory in the gap of blind hole and the thin stick of wax-pattern in the blind hole of the thin stick insertion ontology wax-pattern of the wax-pattern for being coated with shell；4. carrying out whole shell after plastic refractory natural drying and being coated with；5. after the completion of whole shell is coated with, the thin stick part mill of the wax-pattern for stretching out blind hole part being opened, exposes internal wax-pattern, then whole wax-pattern and the thin stick of wax-pattern are dewaxed；6. the whole shell for having taken off wax is roasted, investment-casting shell is obtained.It solves the problems, such as prepared by shell of the casting with elongated blind hole investment-casting, ensure that the investment shell intensity in blind hole, phenomenon of " running away " does not occur for casting when casting, eliminates the incompleteness defect in blind hole.
Description
Technical field
The invention belongs to precision-investment casting fields, are related to a kind of preparation method of elongated blind hole investment-casting shell of band.
Background technique
Model casting is also known as " lost-wax casting ", it is that fusible pattern simultaneously combination die group is made with soluble material, then mould again
Group surface applies multiple layer refractory, forms shell after solidification to be dried, shell heating is melted out mould material, then after high-temperature roasting
Molten metal is poured into up to investment-casting.
In model casting, shell preparation is important one of process, and the quality of quality of investment shell will directly affect casting
Quality.Shell is generally produced with the method for being coated at present.It is coated with fire resisting slurry in wax-pattern group, then removes excessive paste,
Fire-resistant sand grains are sprinkled, then by the dry hardening of coating, make to form first layer shell outside mould group.Repetitive operation is multiple, in mould group shape
At the shell that multilayer is firm.According to the difference of part shape size, usual smallclothes need to make 4~5 stratotype shells, and big part needs to make
7~8 stratotype shells can just obtain required investment shell intensity, that is to say, that 4 stratotype shells is typically at least needed just to can guarantee that shell has
Enough intensity avoids being unlikely to that " runout " phenomenon occurs after molten metal enters shell, casting is caused to form incompleteness defect,
Casting is even resulted in scrap.
For having the casting of elongated blind hole, due to elongated blind chamber, it is difficult to be coated with fire resisting slurry, also be more difficult to clear
It manages and floats sand in hole, when so that being coated with about 2 layers, blocked in hole to be coated with repeatedly, and cause local investment shell intensity in hole insufficient,
" runout " phenomenon occurs when casting, so that casting is formed incompleteness defect, even results in casting and scrap.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of elongated blind hole investment-casting shell of band is provided
Preparation method, improve the intensity with elongated blind hole investment-casting shell, it is useless to reduce part for the throwing amount of repairing after reducing casting pouring
Product loss.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of preparation method of the elongated blind hole investment-casting shell of band, includes the following steps；
Step 1 makes the wax-pattern of wax-pattern thin stick and ontology casting, and the thin stick diameter of wax-pattern is less than ontology casting blind hole diameter,
Length is greater than ontology casting blind hole length；
Step 2, is coated with technique using identical as ontology casting, is coated with 3~5 stratotype shells to the thin stick of wax-pattern；
Step 3, by the blind hole of the wax-pattern for being coated with shell thin stick insertion ontology wax-pattern, in blind hole and the thin stick of wax-pattern
Plastic refractory is injected in gap；
Step 4 carries out whole shell and is coated with after plastic refractory natural drying；
Step 5 after the completion of whole shell is coated with, the thin stick part mill of the wax-pattern for stretching out blind hole part is opened, internal wax is exposed
Mould, then whole wax-pattern and the thin stick of wax-pattern are dewaxed；
The whole shell for having taken off wax is roasted, obtains investment-casting shell by step 6.
Preferably, in step 1, the thin stick diameter of wax-pattern is less than ontology casting blind hole diameter 3mm~5mm, and length is greater than ontology
Casting blind hole length 8mm~10mm.
Further, the thin stick diameter of wax-pattern is less than ontology casting blind hole diameter 5mm, and length is greater than ontology casting blind hole length
10mm。
Preferably, in step 2,4 stratotype shells are coated with to the thin stick of wax-pattern.
Further, in step 2, the silica solution-for being coated with shell first layer and using viscosity first as 40s~50s of the thin stick of wax-pattern
Zirconium English powder is coated with, then carries out stucco using 70# emergy, after airdrying time is more than or equal to 12 hours, carries out the second layer
It is coated with；The second layer first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 37s~42s and is coated with, then using shop on 36#
Sand progress stucco, is more than or equal to 20 minutes to airdrying time, and ammonia does the time after ten minutes, to carry out third to four layers of painting
It hangs；Every layer of third to four layers first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 13s~15s and is coated with, then adopts
Stucco is carried out with shop sand on 24#, is more than or equal to 20 minutes to airdrying time, and ammonia does the time after ten minutes, to complete wax-pattern
Thin stick is coated with.
Preferably, in step 3, plastic refractory uses silica solution-zirconium English powder.
Preferably, in step 4, the plastic refractory natural drying time is at least 12 hours.
Preferably, in step 4, it is 8~10 layers that whole shell, which is coated with the number of plies,.
Further, it is 10 layers that whole shell, which is coated with the number of plies, and whole shell is coated with first layer and first uses viscosity for 40s~50s
Silica solution-zirconium English powder be coated with, then using 70# emergy carry out stucco, after airdrying time be more than or equal to 12 hours after, into
The row second layer is coated with；The second layer first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 37s~42s, then using shop on 36#
Sand progress stucco, is more than or equal to 20 minutes to airdrying time, and ammonia does the time after ten minutes, to carry out third to nine layers of painting
It hangs；Every layer of third to nine layers first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 13s~15s and is coated with, then adopts
Stucco is carried out with shop sand on 24#, is more than or equal to 20 minutes to airdrying time, and ammonia does the time after ten minutes, to be obturaged
Layer is coated with；It obturages layer phosphoric acid is first used to go up shop powder for the silicate hydrolyzate liquid-of 13s~15s and be coated with, when from dry
Between be more than or equal to 12 hours after, complete whole is coated with.
Preferably, in step 5, the shell for having taken off wax is put into roaster and is roasted, maturing temperature is 840~860
DEG C, heat preservation is come out of the stove after 1~1.5 hour.
Compared with prior art, the invention has the following advantages:
The method of the invention is to prepare the thin stick of wax-pattern in advance before whole wax-pattern prepares shell, to the thin stick of wax-pattern into
Row shell is coated with, and is then put the thin rod type shell prepared in the elongated blind hole of wax-pattern into, and in elongated blind hole and thin rod type shell
Between gap in inject fire resisting slurry, after fire resisting slurry is dry, then carries out shell and be coated with, solve casting with elongated blind
The shell of hole investment-casting prepares problem, ensure that the investment shell intensity in blind hole, and phenomenon of " running away " does not occur for casting when casting, disappears
In addition to the incompleteness defect in blind hole.
Detailed description of the invention
Fig. 1 is the wax-pattern schematic diagram of ontology casting of the invention；
Fig. 2 is the thin stick schematic diagram of wax-pattern of the invention；
Fig. 3 is the schematic diagram that the thin stick of wax-pattern of the invention is coated with shell；
Fig. 4 is the schematic diagram that the thin stick of wax-pattern of the invention is inserted into ontology wax-pattern；
Fig. 5 is the schematic diagram of injection plastic refractory of the invention；
Fig. 6 is the schematic diagram that whole shell of the invention is coated with.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
As shown in Figure 1, the preparation method of the elongated blind hole investment-casting shell of band of the present invention the following steps are included:
Step 1, makes the wax-pattern of wax-pattern thin stick and ontology casting, and the thin stick diameter of wax-pattern is less than ontology casting blind hole diameter
3mm~5mm, length are greater than ontology casting blind hole length 8mm~10mm.
Step 2, is coated with technique using identical as ontology casting, is coated with 3~5 stratotype shells to the thin stick of wax-pattern.
Step 3, by the blind hole of the wax-pattern for being coated with shell thin stick insertion ontology wax-pattern, in blind hole and the thin stick of wax-pattern
Plastic refractory is injected in gap.
Step 4 carries out whole shell and is coated with, it is 8~10 that whole shell, which is coated with the number of plies, after plastic refractory natural drying
Layer.
Step 5 after the completion of whole shell is coated with, the thin stick part mill of the wax-pattern for stretching out blind hole part is opened, internal wax is exposed
Mould, then whole wax-pattern and the thin stick of wax-pattern are dewaxed.
The shell for having taken off wax is put into roaster and roasts by step 6, and maturing temperature is 840~860 DEG C, heat preservation 1
It comes out of the stove after~1.5 hours, obtains investment-casting shell.
Specific implementation process is；Using casting material as austenitic stainless steel ZG1Cr18Ni9Ti, casting contains a diameter
For Φ 15mm, for length is the blind hole of 20mm.Due to elongated blind hole, it is difficult to be coated with fire resisting slurry, also be more difficult to clear
It manages and floats sand in hole, when so that being coated with about 2 layers, blocked in hole to be coated with repeatedly, and cause local investment shell intensity in hole insufficient,
" runout " phenomenon occurs when casting, so that casting is formed incompleteness defect, casting blind hole repair rate is caused to be up to 95%.
Preparation process are as follows: step 1: piece diameter of compacting is Φ 10mm, length is the thin stick of wax-pattern of 30mm.
Step 2: being coated with technique according to the shell of ontology casting to the thin stick of the wax-pattern of compression moulding, it is coated with 4 stratotype shells.It applies
It hangs parameter and is shown in Table 1.
Table 1
Step 3: by the elongated blind hole of the wax-pattern for being coated with 4 stratotype shells thin stick insertion ontology wax-pattern, in elongated blind hole and
Suitable surface layer fire resisting slurry (i.e. the silica solution of first layer-zirconium English powder) is injected in gap between thin rod type shell.
It is coated with step 4: normal shell can be carried out after fire resisting slurry spontaneously dries 12 hours.Parameter is coated with to be shown in Table
2。
Table 2
Step 5: after the completion of shell is coated with, elongated blind hole part will be exposed using grinding wheel the thin rod type shell end head of wax-pattern
Divide mill to open, exposes wax-pattern, then entire wax-pattern is put into high pressure dewaxing kettle and is dewaxed.
Step 6: the shell for having taken off wax is put into roaster, maturing temperature is 850 ± 10 DEG C, is gone out after heat preservation 1 hour
Furnace to get arrive investment-casting shell.
After the present embodiment is using the process for making shell of prefabricated blind hole shell, solves casting with elongated blind hole investment-casting
Shell prepares problem, ensure that the investment shell intensity in blind hole, and phenomenon of " running away " does not occur for casting when casting, eliminates in blind hole
Incompleteness defect, casting blind hole internal surface quality pass rate 100%.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (10)
1. a kind of preparation method of the elongated blind hole investment-casting shell of band, which is characterized in that include the following steps；
Step 1, makes the wax-pattern of wax-pattern thin stick and ontology casting, and the thin stick diameter of wax-pattern is less than ontology casting blind hole diameter, length
Greater than ontology casting blind hole length；
Step 2, is coated with technique using identical as ontology casting, is coated with 3~5 stratotype shells to the thin stick of wax-pattern；
The thin stick of the wax-pattern for being coated with shell is inserted into the blind hole of ontology wax-pattern, in the gap of blind hole and the thin stick of wax-pattern by step 3
Middle injection plastic refractory；
Step 4 carries out whole shell and is coated with after plastic refractory natural drying；
Step 5 after the completion of whole shell is coated with, the thin stick part mill of the wax-pattern for stretching out blind hole part is opened, internal wax-pattern is exposed,
Whole wax-pattern and the thin stick of wax-pattern are dewaxed again；
The whole shell for having taken off wax is roasted, obtains investment-casting shell by step 6.
2. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 1, which is characterized in that step
In one, the thin stick diameter of wax-pattern be less than ontology casting blind hole diameter 3mm~5mm, length be greater than ontology casting blind hole length 8mm~
10mm。
3. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 2, which is characterized in that wax-pattern
Thin stick diameter is less than ontology casting blind hole diameter 5mm, and length is greater than ontology casting blind hole length 10mm.
4. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 1, which is characterized in that step
In two, 4 stratotype shells are coated with to the thin stick of wax-pattern.
5. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 4, which is characterized in that step
In two, the shell first layer that is coated with of the thin stick of wax-pattern first uses viscosity to be coated with for the silica solution of 40s~50s-zirconium English powder, then adopted
Stucco is carried out with 70# emergy, after airdrying time is more than or equal to 12 hours, the second layer is carried out and is coated with；The second layer is first using viscous
Degree is gone up shop powder for the silicate hydrolyzate liquid-of 37s~42s and is coated with, then carries out stucco using shop sand on 36#, when from dry
Between be more than or equal to 20 minutes, and it is after ten minutes, to carry out third and be coated with to four layers that ammonia, which does the time,；Every layer of third to four layers is
It first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 13s~15s to be coated with, then stucco is carried out using shop sand on 24#,
It is more than or equal to 20 minutes to airdrying time, and ammonia does the time after ten minutes, to complete being coated with for the thin stick of wax-pattern.
6. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 1, which is characterized in that step
In three, plastic refractory uses silica solution-zirconium English powder.
7. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 1, which is characterized in that step
In four, the plastic refractory natural drying time is at least 12 hours.
8. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 1, which is characterized in that step
In four, it is 8~10 layers that whole shell, which is coated with the number of plies,.
9. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 8, which is characterized in that whole
It is 10 layers that shell, which is coated with the number of plies, and whole shell is coated with first layer and viscosity is first used to carry out for the silica solution of 40s~50s-zirconium English powder
It is coated with, then stucco is carried out using 70# emergy, after airdrying time is more than or equal to 12 hours, carries out the second layer and be coated with；The second layer
It first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 37s~42s, then stucco is carried out using shop sand on 36#, when from dry
Between be more than or equal to 20 minutes, and it is after ten minutes, to carry out third and be coated with to nine layers that ammonia, which does the time,；Every layer of third to nine layers is
It first uses viscosity to go up shop powder for the silicate hydrolyzate liquid-of 13s~15s to be coated with, then stucco is carried out using shop sand on 24#,
It is more than or equal to 20 minutes to airdrying time, and it is after ten minutes, to carry out obturaging layer being coated with that ammonia, which does the time,；Layer is obturaged first using material
Slurry viscosity is gone up shop powder for the silicate hydrolyzate liquid-of 13s~15s and is coated with, complete after airdrying time is more than or equal to 12 hours
It is integral to be coated with.
10. a kind of preparation method of the elongated blind hole investment-casting shell of band according to claim 1, which is characterized in that step
In rapid five, the shell for having taken off wax is put into roaster and is roasted, maturing temperature is 840~860 DEG C, keeps the temperature 1~1.5 hour
After come out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910551439.6A CN110180994B (en) | 2019-06-24 | 2019-06-24 | Preparation method of investment casting shell with long and thin blind holes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910551439.6A CN110180994B (en) | 2019-06-24 | 2019-06-24 | Preparation method of investment casting shell with long and thin blind holes |
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| CN110180994A true CN110180994A (en) | 2019-08-30 |
| CN110180994B CN110180994B (en) | 2020-09-25 |
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ID=67723170
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| Country | Link |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110640085A (en) * | 2019-10-29 | 2020-01-03 | 贵州安吉航空精密铸造有限责任公司 | Investment casting process for hollow casting |
| CN111001759A (en) * | 2019-11-11 | 2020-04-14 | 湖州南丰机械制造有限公司 | Shell making method for improving sand removing efficiency of casting |
| CN111992679A (en) * | 2020-08-24 | 2020-11-27 | 贵州安吉航空精密铸造有限责任公司 | Coating method for thin-wall hollow casting shell |
| CN112620580A (en) * | 2020-12-23 | 2021-04-09 | 安徽应流铸业有限公司 | Shell making process for long-hole castings |
| CN113695517A (en) * | 2021-08-25 | 2021-11-26 | 贵州安吉航空精密铸造有限责任公司 | Preparation method of shell of titanium alloy investment casting with long and narrow through hole |
| CN114406190A (en) * | 2021-12-28 | 2022-04-29 | 东营一诚精密金属有限公司 | Process method for ensuring coaxiality of investment casting blind holes |
| CN115319029A (en) * | 2022-08-12 | 2022-11-11 | 衡阳市嘉励运动器材有限公司 | Sand core for casting and casting process for thin-walled parts |
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| CN104493091A (en) * | 2014-12-15 | 2015-04-08 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method of aluminum alloy pores |
| CN107520406A (en) * | 2017-09-12 | 2017-12-29 | 东方电气集团东方汽轮机有限公司 | A kind of long tube shape component casting method |
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| JPH0716700A (en) * | 1993-06-30 | 1995-01-20 | Daido Steel Co Ltd | Wax pattern used to manufacture of mold and method for coating refractory sand |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110640085A (en) * | 2019-10-29 | 2020-01-03 | 贵州安吉航空精密铸造有限责任公司 | Investment casting process for hollow casting |
| CN111001759A (en) * | 2019-11-11 | 2020-04-14 | 湖州南丰机械制造有限公司 | Shell making method for improving sand removing efficiency of casting |
| CN111992679A (en) * | 2020-08-24 | 2020-11-27 | 贵州安吉航空精密铸造有限责任公司 | Coating method for thin-wall hollow casting shell |
| CN112620580A (en) * | 2020-12-23 | 2021-04-09 | 安徽应流铸业有限公司 | Shell making process for long-hole castings |
| CN112620580B (en) * | 2020-12-23 | 2023-05-26 | 安徽应流铸业有限公司 | Shell making process for long hole castings |
| CN113695517A (en) * | 2021-08-25 | 2021-11-26 | 贵州安吉航空精密铸造有限责任公司 | Preparation method of shell of titanium alloy investment casting with long and narrow through hole |
| CN114406190A (en) * | 2021-12-28 | 2022-04-29 | 东营一诚精密金属有限公司 | Process method for ensuring coaxiality of investment casting blind holes |
| CN115319029A (en) * | 2022-08-12 | 2022-11-11 | 衡阳市嘉励运动器材有限公司 | Sand core for casting and casting process for thin-walled parts |
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| Publication number | Publication date |
|---|---|
| CN110180994B (en) | 2020-09-25 |
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