CN107520405A - A kind of high-performance investment casting shell - Google Patents
A kind of high-performance investment casting shell Download PDFInfo
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- CN107520405A CN107520405A CN201710646429.1A CN201710646429A CN107520405A CN 107520405 A CN107520405 A CN 107520405A CN 201710646429 A CN201710646429 A CN 201710646429A CN 107520405 A CN107520405 A CN 107520405A
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- shell
- wax
- bentonite
- layer slurry
- pattern
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Classifications
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- 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
- B22C9/043—Removing the consumable pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of high-performance investment casting shell, it is related to casting technology field, including：（1）By 500 mesh quartz sands, rare earth, silester rosin complexing agent, activated bentonite by uniformly admixed together, it is added in homogenizer, it is stirred, obtain shell internal layer slurry, 200 mesh quartz sands, silester rosin complexing agent, activated bentonite is admixed together, it is added in homogenizer, is stirred, obtains shell outer layer slurry；（2）Slurry in shell is uniformly applied to wax pattern surface, after drying, then carries out uniformly smearing shell outer layer slurry, obtains coating wax-pattern；（3）Cladding wax pattern surface is uniformly tied up using iron wire；（4）Cladding wax-pattern is put into progress dewaxing processing in high temperature, after wax-pattern is completely melt, produces required casting shell.Investment casting shell prepared by the present invention can cast the casting of higher precision and surface roughness, and high temperature strength itself is high, and retained strength is low.
Description
Technical field
The invention belongs to casting technology field, and in particular to a kind of high-performance investment casting shell.
Background technology
Model casting typically refers to fusible material and apperance is made, and shell is made in apperance Surface coating refractory material, then will
Apperance melt discharge shell, so as to obtain the casting of no die joint, after high-temperature roasting can back-up sand pouring plan, existing skill
Art generally use wax material manufactures, in recent years, with the development of melted module precise casting technology, to the surface quality of precision castings
With dimension precision requirement more and more higher, therefore higher requirement is proposed to the quality of coating and shell mould, in model casting often
It is waterglass with binding agent, because containing Na2O, and investment shell intensity is low under high temperature, deformation is big, cause casting accuracy reduce and
Surface roughness increase, therefore suitable for the production of the less demanding investment-casting of Surface Quality.Ludox is in model casting
A kind of binding agent, Ludox is to depend on moisture evaporation to realize solidification in silicasol case, and environmental condition requires harsh, and type
The housing chamber temperature low intensity shell cycle is grown, extreme influence production efficiency.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of high-performance investment casting shell.
The present invention is achieved by the following technical solutions：
A kind of high-performance investment casting shell, comprises the following steps：
（1）500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed 100:0.15-0.18:6-8:
10-15 mass ratio is uniformly admixed together, is added in homogenizer, is stirred, and obtains shell internal layer slurry, will
200 mesh quartz sands, silester-rosin complexing agent, activated bentonite press 100:8-10:12-14 mass ratio uniformly mixes
To together, it is added in homogenizer, is stirred, obtains shell outer layer slurry；
（2）By step（1）Slurry is uniformly applied to wax pattern surface in the shell of middle preparation, after drying, then carries out uniform smear type
Shell outer layer slurry, is then dried again, obtains coating wax-pattern；
（3）By step（2）In cladding wax pattern surface uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
（4）By step（3）Cladding wax-pattern after processing is put into progress dewaxing processing in high temperature, after wax-pattern is completely melt, produces institute
Shell need to be cast.
Further, the step（1）Middle rare earth is lanthanum chloride.
Further, the step（1）Middle silester-rosin complexing agent preparation method is：After rosin is melted, addition
The silester of 20 times of its quality, with 3500r/min rotating speeds stir 2 hours, then, then with 500r/min rotating speeds stir 30min,
Then the water of silester quality 50% is added, then 40min is stirred with 1500r/min rotating speeds, is produced.
Further, the step（1）Middle activated bentonite preparation method is：Bentonite is calcined at 500 DEG C
40min, after then naturally cooling to room temperature, grinding, after crossing 800 mesh sieves, it is distributed in deionized water, mass concentration, which is made, is
10% bentonite suspension, the sulfuric acid solution that mass fraction is 10% is added into bentonite suspension, and regulation bentonite suspends
Liquid pH to 4.0,60 DEG C are heated to, are incubated 40min, then use mass fraction to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension filtering, is dried to constant weight, produced to neutrality.
Further, the step（2）Middle smearing shell internal layer slurry, smearing thickness 2-4mm, smears shell outer layer slurry
Material, smearing thickness 3-5mm.
Further, the step（3）Middle No. 30 iron wires of iron wire model.
The present invention has advantages below compared with prior art：Investment casting shell prepared by the present invention is using different meshes
Double shells made of quartz sand, the relatively low surface roughness having by the shell of internal layer, surface is smooth, at high temperature shell
Intensity is high, and deformation is small, can significantly reduce surface roughness and improve the precision of casting, by the shell of outer layer, use
Compared with the quartz sand of low mesh number, more close combination can be formed between silester-rosin complexing agent, bond strength is higher,
Internal layer shell can be firmly wrapped, further improves the overall intensity of casting shell, while do not influence interior stratotype again
The surface quality of shell, by adding rare earth in interior stratotype shell, it is possible to increase the elevated temperature strength and anti-deforming of internal layer shell
Ability, the residual strength of investment casting shell can be especially reduced, the later stage can be easy to remove casting endoporus, inner chamber, avoided
Follow-up after-treatment, saves process and time, while can ensure the accuracy of casting, is prepared by using the present invention
Silester-rosin complexing agent, its fire resistance is good, deforms during high temperature and the taxis of cracking is small, good thermal shock stability so that
The investment casting shell of preparation disclosure satisfy that the production of dystectic alloy precision casting.
Embodiment
Embodiment 1
A kind of high-performance investment casting shell, comprises the following steps：
（1）500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed 100:0.15:6:10 quality
Ratio uniform is admixed together, is added in homogenizer, is stirred, and obtains shell internal layer slurry, by 200 mesh quartz
Sand, silester-rosin complexing agent, activated bentonite press 100:8:12 mass ratio is uniformly admixed together, is added to height
In fast mixer, it is stirred, obtains shell outer layer slurry；
（2）By step（1）Slurry is uniformly applied to wax pattern surface in the shell of middle preparation, after drying, then carries out uniform smear type
Shell outer layer slurry, is then dried again, obtains coating wax-pattern；
（3）By step（2）In cladding wax pattern surface uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
（4）By step（3）Cladding wax-pattern after processing is put into progress dewaxing processing in high temperature, after wax-pattern is completely melt, produces institute
Shell need to be cast.
Further, the step（1）Middle rare earth is lanthanum chloride.
Further, the step（1）Middle silester-rosin complexing agent preparation method is：After rosin is melted, addition
The silester of 20 times of its quality, with 3500r/min rotating speeds stir 2 hours, then, then with 500r/min rotating speeds stir 30min,
Then the water of silester quality 50% is added, then 40min is stirred with 1500r/min rotating speeds, is produced.
Further, the step（1）Middle activated bentonite preparation method is：Bentonite is calcined at 500 DEG C
40min, after then naturally cooling to room temperature, grinding, after crossing 800 mesh sieves, it is distributed in deionized water, mass concentration, which is made, is
10% bentonite suspension, the sulfuric acid solution that mass fraction is 10% is added into bentonite suspension, and regulation bentonite suspends
Liquid pH to 4.0,60 DEG C are heated to, are incubated 40min, then use mass fraction to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension filtering, is dried to constant weight, produced to neutrality.
Further, the step（2）Middle smearing shell internal layer slurry, smearing thickness 2mm, smears shell outer layer slurry
Material, smearing thickness 3mm.
Further, the step（3）Middle No. 30 iron wires of iron wire model.
Embodiment 2
A kind of high-performance investment casting shell, comprises the following steps：
（1）500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed 100: 0.18: 8:15
Mass ratio is uniformly admixed together, is added in homogenizer, is stirred, and obtains shell internal layer slurry, by 200 mesh stones
Sand, silester-rosin complexing agent, activated bentonite press 100: 10:14 mass ratio is uniformly admixed together, addition
Into homogenizer, it is stirred, obtains shell outer layer slurry；
（2）By step（1）Slurry is uniformly applied to wax pattern surface in the shell of middle preparation, after drying, then carries out uniform smear type
Shell outer layer slurry, is then dried again, obtains coating wax-pattern；
（3）By step（2）In cladding wax pattern surface uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
（4）By step（3）Cladding wax-pattern after processing is put into progress dewaxing processing in high temperature, after wax-pattern is completely melt, produces institute
Shell need to be cast.
Further, the step（1）Middle rare earth is lanthanum chloride.
Further, the step（1）Middle silester-rosin complexing agent preparation method is：After rosin is melted, addition
The silester of 20 times of its quality, with 3500r/min rotating speeds stir 2 hours, then, then with 500r/min rotating speeds stir 30min,
Then the water of silester quality 50% is added, then 40min is stirred with 1500r/min rotating speeds, is produced.
Further, the step（1）Middle activated bentonite preparation method is：Bentonite is calcined at 500 DEG C
40min, after then naturally cooling to room temperature, grinding, after crossing 800 mesh sieves, it is distributed in deionized water, mass concentration, which is made, is
10% bentonite suspension, the sulfuric acid solution that mass fraction is 10% is added into bentonite suspension, and regulation bentonite suspends
Liquid pH to 4.0,60 DEG C are heated to, are incubated 40min, then use mass fraction to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension filtering, is dried to constant weight, produced to neutrality.
Further, the step（2）Middle smearing shell internal layer slurry, smearing thickness 4mm, smears shell outer layer slurry
Material, smearing thickness 5mm.
Further, the step（3）Middle No. 30 iron wires of iron wire model.
Embodiment 3
A kind of high-performance investment casting shell, comprises the following steps：
（1）500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed 100:0.16:7:12 quality
Ratio uniform is admixed together, is added in homogenizer, is stirred, and obtains shell internal layer slurry, by 200 mesh quartz
Sand, silester-rosin complexing agent, activated bentonite press 100:9:13 mass ratio is uniformly admixed together, is added to height
In fast mixer, it is stirred, obtains shell outer layer slurry；
（2）By step（1）Slurry is uniformly applied to wax pattern surface in the shell of middle preparation, after drying, then carries out uniform smear type
Shell outer layer slurry, is then dried again, obtains coating wax-pattern；
（3）By step（2）In cladding wax pattern surface uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
（4）By step（3）Cladding wax-pattern after processing is put into progress dewaxing processing in high temperature, after wax-pattern is completely melt, produces institute
Shell need to be cast.
Further, the step（1）Middle rare earth is lanthanum chloride.
Further, the step（1）Middle silester-rosin complexing agent preparation method is：After rosin is melted, addition
The silester of 20 times of its quality, with 3500r/min rotating speeds stir 2 hours, then, then with 500r/min rotating speeds stir 30min,
Then the water of silester quality 50% is added, then 40min is stirred with 1500r/min rotating speeds, is produced.
Further, the step（1）Middle activated bentonite preparation method is：Bentonite is calcined at 500 DEG C
40min, after then naturally cooling to room temperature, grinding, after crossing 800 mesh sieves, it is distributed in deionized water, mass concentration, which is made, is
10% bentonite suspension, the sulfuric acid solution that mass fraction is 10% is added into bentonite suspension, and regulation bentonite suspends
Liquid pH to 4.0,60 DEG C are heated to, are incubated 40min, then use mass fraction to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension filtering, is dried to constant weight, produced to neutrality.
Further, the step（2）Middle smearing shell internal layer slurry, smearing thickness 3mm, smears shell outer layer slurry
Material, smearing thickness 4mm.
Further, the step（3）Middle No. 30 iron wires of iron wire model.
Comparative example 1：Differed only in embodiment 1 and shell outer layer slurry is replaced with into shell internal layer slurry, smearing thickness
It is constant.
Comparative example 2：Differed only in embodiment 1 and shell internal layer slurry is replaced with into shell outer layer slurry, smearing thickness
It is constant.
Comparative example 3：Differed only in embodiment 1 and silester-rosin complexing agent is replaced with into Ludox.
Comparative example 4：Differed only in embodiment 1 in shell internal layer slurry and do not add rare earth.
Experiment
The investment casting shell prepared to embodiment and comparative example method pour the molten iron of identical equivalent, and identical rule are made
The casting of lattice, contrast the cast(ing) surface precision and surface roughness of each investment casting shell casting：
Table 1
| Precision | Surface roughness μm | |
| Embodiment 1 | CT4 | Ra0.6 |
| Embodiment 2 | CT4 | Ra0.6 |
| Embodiment 3 | CT4 | Ra0.6 |
| Comparative example 1 | CT5 | Ra1.8 |
| Comparative example 2 | CT7 | Ra0.8 |
| Comparative example 3 | CT6 | Ra1.2 |
| Comparative example 4 | CT5 | Ra0.7 |
As can be seen from Table 1, the surface quality of continuous castings for the investment casting shell casting that prepared by the present invention significantly improves.
According to HB5352.1-86《Investment casting shell bending strength measuring method》Measure what embodiment was prepared with comparative example
The residual strength of investment casting shell；Residual strength is that shell is entered into stove in 300 DEG C of conditions, is gradually heating to 1500 DEG C, is protected
Temperature 2 hours, is cooled to less than 300 DEG C and comes out of the stove, and detects；
Table 2
| Residual strength MPa | |
| Embodiment 1 | 3.62 |
| Embodiment 2 | 3.68 |
| Embodiment 3 | 3.65 |
| Comparative example 1 | 4.39 |
| Comparative example 2 | 5.15 |
| Comparative example 3 | 5.38 |
| Comparative example 4 | 4.69 |
As can be seen from Table 2, the investment casting shell that prepared by the present invention participates in low intensity.
Claims (6)
1. a kind of high-performance investment casting shell, it is characterised in that comprise the following steps：
（1）500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed 100:0.15-0.18:6-8:
10-15 mass ratio is uniformly admixed together, is added in homogenizer, is stirred, and obtains shell internal layer slurry, will
200 mesh quartz sands, silester-rosin complexing agent, activated bentonite press 100:8-10:12-14 mass ratio uniformly mixes
To together, it is added in homogenizer, is stirred, obtains shell outer layer slurry；
（2）By step（1）Slurry is uniformly applied to wax pattern surface in the shell of middle preparation, after drying, then carries out uniform smear type
Shell outer layer slurry, is then dried again, obtains coating wax-pattern；
（3）By step（2）In cladding wax pattern surface uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
（4）By step（3）Cladding wax-pattern after processing is put into progress dewaxing processing in high temperature, after wax-pattern is completely melt, produces institute
Shell need to be cast.
A kind of 2. high-performance investment casting shell according to claim 1, it is characterised in that the step（1）Middle rare earth
For lanthanum chloride.
A kind of 3. high-performance investment casting shell according to claim 1, it is characterised in that the step（1）Middle silicic acid
Ethyl ester-rosin complexing agent preparation method is：After rosin is melted, the silester of 20 times of its quality is added, is turned with 3500r/min
Speed stirring 2 hours, then, then 30min stirred with 500r/min rotating speeds, then add the water of silester quality 50%, then with
1500r/min rotating speeds stir 40min, produce.
A kind of 4. high-performance investment casting shell according to claim 1, it is characterised in that the step（1）Middle activation
Bentonite preparation method is：Bentonite is calcined into 40min at 500 DEG C, after then naturally cooling to room temperature, grinding, crosses 800 mesh
After sieve, it is distributed in deionized water, the bentonite suspension that mass concentration is 10% is made, matter is added into bentonite suspension
The sulfuric acid solution that fraction is 10% is measured, adjusts bentonite suspension pH to 4.0, is heated to 60 DEG C, 40min is incubated, then uses again
The sodium hydroxide solution that mass fraction is 5% adjusts bentonite suspension pH to neutrality, filtering, is dried to constant weight, produces.
A kind of 5. high-performance investment casting shell according to claim 1, it is characterised in that the step（2）Middle smearing
Shell internal layer slurry, smearing thickness 2-4mm, smear shell outer layer slurry, smearing thickness 3-5mm.
A kind of 6. high-performance investment casting shell according to claim 1, it is characterised in that the step（3）Middle iron wire
No. 30 iron wires of model.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710646429.1A CN107520405B (en) | 2017-08-01 | 2017-08-01 | A kind of high-performance investment casting shell |
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| CN201710646429.1A CN107520405B (en) | 2017-08-01 | 2017-08-01 | A kind of high-performance investment casting shell |
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| CN107520405B CN107520405B (en) | 2019-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110523921A (en) * | 2019-09-27 | 2019-12-03 | 广船国际有限公司 | A kind of casting method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2742096C1 (en) * | 2020-07-02 | 2021-02-02 | Владимир Михайлович Волков | Method of making casting molds in investment pattern |
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