CN107520405B - A kind of high-performance investment casting shell - Google Patents
A kind of high-performance investment casting shell Download PDFInfo
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- CN107520405B CN107520405B CN201710646429.1A CN201710646429A CN107520405B CN 107520405 B CN107520405 B CN 107520405B CN 201710646429 A CN201710646429 A CN 201710646429A CN 107520405 B CN107520405 B CN 107520405B
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- shell
- layer slurry
- wax
- silester
- pattern
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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 shells, it is related to casting technology field, it include: (1) by 500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite by uniformly admixed together, it is added in high-speed mixer, is stirred, obtains shell internal layer slurry, 200 mesh quartz sands, silester-rosin complexing agent, activated bentonite is admixed together, it is added in high-speed mixer, 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, obtain cladding wax-pattern；(3) cladding wax pattern surface is uniformly tied up using iron wire；(4) cladding wax-pattern is put into high temperature progress dewaxing processing, wax-pattern be completely melt after to get required casting shell.Investment casting shell prepared by the present invention can cast the casting of higher precision and surface roughness, high temperature strength itself is high, and retained strength is low.
Description
Technical field
The invention belongs to casting technology fields, and in particular to a kind of high-performance investment casting shell.
Background technique
Model casting typically refers to fusible material and apperance is made, and on apperance surface, shell is made in cladding refractory material, then will
Apperance melt discharge shell, thus obtain the casting without die joint, after high-temperature roasting can back-up sand pouring plan, existing skill
Art generallys use wax material to manufacture, in recent years, with the development of melted module precise casting technology, to the surface quality of precision castings
It is higher and higher with dimension precision requirement, therefore more stringent requirements are proposed to the quality of coating and shell mould, in model casting often
It is waterglass with binder, because containing Na2O, and investment shell intensity is low under high temperature, deformation is big, cause casting accuracy reduce and
Surface roughness increases, therefore is suitable for the production of Surface Quality investment-casting of less demanding.Silica solution is in model casting
A kind of binder, silica solution is to evaporate by moisture and realize solidification in silicasol case, and environmental condition requires harsh, and type
The shell room temperature intensity low shell period processed is long, extreme influence production efficiency.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of high-performance investment casting shell is provided.
The present invention is achieved by the following technical solutions:
A kind of high-performance investment casting shell, comprising the following steps:
(1) 500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed into 100:0.15-0.18:
The mass ratio of 6-8:10-15 is uniformly admixed together, is added in high-speed mixer, is stirred, and obtains shell internal layer slurry
Material, 200 mesh quartz sands, silester-rosin complexing agent, activated bentonite is uniform by the mass ratio of 100:8-10:12-14
It is admixed together, it is added in high-speed mixer, is stirred, obtains shell outer layer slurry；
(2) slurry in the shell prepared in step (1) is uniformly applied to wax pattern surface, after drying, then is uniformly applied
Shell outer layer slurry is smeared, is then dried again, cladding wax-pattern is obtained；
(3) the cladding wax pattern surface in step (2) is uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
(4) by step (3), treated that cladding wax-pattern is put into high temperature progress dewaxing processing, after wax-pattern is completely melt, i.e.,
Shell is cast needed for obtaining.
Further, rare earth is lanthanum chloride in the step (1).
Further, after silester-rosin complexing agent is the preparation method comprises the following steps: rosin is melted in the step (1), addition
The silester of 20 times of its quality, with 3500r/min revolving speed stirring 2 hours, then, then with 500r/min revolving speed stir 30min,
Then add silester quality 50% water, then with 1500r/min revolving speed stirring 40min to get.
Further, in the step (1) activated bentonite the preparation method comprises the following steps: bentonite is calcined at 500 DEG C
40min, then after cooled to room temperature, grinding is distributed in deionized water, mass concentration, which is made, is after crossing 800 meshes
10% bentonite suspension adds the sulfuric acid solution that mass fraction is 10% into bentonite suspension, adjusts bentonite and suspends
Liquid pH to 4.0 is heated to 60 DEG C, keeps the temperature 40min, and mass fraction is then used to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension is to neutrality, filtering, drying to constant weight to get.
Further, shell internal layer slurry is smeared in the step (2), smearing thickness 2-4mm smears shell outer layer slurry
Material, smearing thickness 3-5mm.
Further, No. 30 iron wires of iron wire model in the step (3).
The present invention has the advantage that investment casting shell prepared by the present invention using different meshes compared with prior art
Double shells made of quartz sand, the lower 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, pass through the shell of outer layer, use
Compared with the quartz sand of low mesh number, closer combination can be formed between silester-rosin complexing agent, bond strength is higher,
Internal layer shell can be firmly wrapped, the intensity of casting shell entirety is further improved, while not influencing interior stratotype again
The surface quality of shell can be improved the elevated temperature strength and anti-deforming of internal layer shell by adding rare earth in interior stratotype shell
Ability especially can reduce the residual strength of investment casting shell, can remove casting inner hole, inner cavity convenient for the later period, avoid
Subsequent secondary treatment, saves process and time, while can ensure the accuracy of casting, prepares by using the present invention
Silester-rosin complexing agent, fire resistance is good, deforms when high temperature and the taxis of cracking is small, good thermal shock stability, so that
The investment casting shell of preparation can satisfy the production of dystectic alloy precision casting.
Specific embodiment
Embodiment 1
A kind of high-performance investment casting shell, comprising the following steps:
(1) by 500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite by 100:0.15:6:10's
Mass ratio is uniformly admixed together, is added in high-speed mixer, is stirred, and obtains shell internal layer slurry, by 200 mesh stones
Sand, silester-rosin complexing agent, activated bentonite are uniformly admixed together by the mass ratio of 100:8:12, are added to
It in high-speed mixer, is stirred, obtains shell outer layer slurry；
(2) slurry in the shell prepared in step (1) is uniformly applied to wax pattern surface, after drying, then is uniformly applied
Shell outer layer slurry is smeared, is then dried again, cladding wax-pattern is obtained；
(3) the cladding wax pattern surface in step (2) is uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
(4) by step (3), treated that cladding wax-pattern is put into high temperature progress dewaxing processing, after wax-pattern is completely melt, i.e.,
Shell is cast needed for obtaining.
Further, rare earth is lanthanum chloride in the step (1).
Further, after silester-rosin complexing agent is the preparation method comprises the following steps: rosin is melted in the step (1), addition
The silester of 20 times of its quality, with 3500r/min revolving speed stirring 2 hours, then, then with 500r/min revolving speed stir 30min,
Then add silester quality 50% water, then with 1500r/min revolving speed stirring 40min to get.
Further, in the step (1) activated bentonite the preparation method comprises the following steps: bentonite is calcined at 500 DEG C
40min, then after cooled to room temperature, grinding is distributed in deionized water, mass concentration, which is made, is after crossing 800 meshes
10% bentonite suspension adds the sulfuric acid solution that mass fraction is 10% into bentonite suspension, adjusts bentonite and suspends
Liquid pH to 4.0 is heated to 60 DEG C, keeps the temperature 40min, and mass fraction is then used to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension is to neutrality, filtering, drying to constant weight to get.
Further, shell internal layer slurry is smeared in the step (2), smearing thickness 2mm smears shell outer layer slurry
Material, smearing thickness 3mm.
Further, No. 30 iron wires of iron wire model in the step (3).
Embodiment 2
A kind of high-performance investment casting shell, comprising the following steps:
(1) 500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed into 100:0.18:8:
15 mass ratio is uniformly admixed together, is added in high-speed mixer, is stirred, and shell internal layer slurry is obtained, by 200
Mesh quartz sand, silester-rosin complexing agent, activated bentonite are uniformly admixed together by the mass ratio of 100:10:14,
It is added in high-speed mixer, is stirred, obtains shell outer layer slurry；
(2) slurry in the shell prepared in step (1) is uniformly applied to wax pattern surface, after drying, then is uniformly applied
Shell outer layer slurry is smeared, is then dried again, cladding wax-pattern is obtained；
(3) the cladding wax pattern surface in step (2) is uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
(4) by step (3), treated that cladding wax-pattern is put into high temperature progress dewaxing processing, after wax-pattern is completely melt, i.e.,
Shell is cast needed for obtaining.
Further, rare earth is lanthanum chloride in the step (1).
Further, after silester-rosin complexing agent is the preparation method comprises the following steps: rosin is melted in the step (1), addition
The silester of 20 times of its quality, with 3500r/min revolving speed stirring 2 hours, then, then with 500r/min revolving speed stir 30min,
Then add silester quality 50% water, then with 1500r/min revolving speed stirring 40min to get.
Further, in the step (1) activated bentonite the preparation method comprises the following steps: bentonite is calcined at 500 DEG C
40min, then after cooled to room temperature, grinding is distributed in deionized water, mass concentration, which is made, is after crossing 800 meshes
10% bentonite suspension adds the sulfuric acid solution that mass fraction is 10% into bentonite suspension, adjusts bentonite and suspends
Liquid pH to 4.0 is heated to 60 DEG C, keeps the temperature 40min, and mass fraction is then used to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension is to neutrality, filtering, drying to constant weight to get.
Further, shell internal layer slurry is smeared in the step (2), smearing thickness 4mm smears shell outer layer slurry
Material, smearing thickness 5mm.
Further, No. 30 iron wires of iron wire model in the step (3).
Embodiment 3
A kind of high-performance investment casting shell, comprising the following steps:
(1) by 500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite by 100:0.16:7:12's
Mass ratio is uniformly admixed together, is added in high-speed mixer, is stirred, and obtains shell internal layer slurry, by 200 mesh stones
Sand, silester-rosin complexing agent, activated bentonite are uniformly admixed together by the mass ratio of 100:9:13, are added to
It in high-speed mixer, is stirred, obtains shell outer layer slurry；
(2) slurry in the shell prepared in step (1) is uniformly applied to wax pattern surface, after drying, then is uniformly applied
Shell outer layer slurry is smeared, is then dried again, cladding wax-pattern is obtained；
(3) the cladding wax pattern surface in step (2) is uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
(4) by step (3), treated that cladding wax-pattern is put into high temperature progress dewaxing processing, after wax-pattern is completely melt, i.e.,
Shell is cast needed for obtaining.
Further, rare earth is lanthanum chloride in the step (1).
Further, after silester-rosin complexing agent is the preparation method comprises the following steps: rosin is melted in the step (1), addition
The silester of 20 times of its quality, with 3500r/min revolving speed stirring 2 hours, then, then with 500r/min revolving speed stir 30min,
Then add silester quality 50% water, then with 1500r/min revolving speed stirring 40min to get.
Further, in the step (1) activated bentonite the preparation method comprises the following steps: bentonite is calcined at 500 DEG C
40min, then after cooled to room temperature, grinding is distributed in deionized water, mass concentration, which is made, is after crossing 800 meshes
10% bentonite suspension adds the sulfuric acid solution that mass fraction is 10% into bentonite suspension, adjusts bentonite and suspends
Liquid pH to 4.0 is heated to 60 DEG C, keeps the temperature 40min, and mass fraction is then used to adjust bentonite for 5% sodium hydroxide solution again
PH of suspension is to neutrality, filtering, drying to constant weight to get.
Further, shell internal layer slurry is smeared in the step (2), smearing thickness 3mm smears shell outer layer slurry
Material, smearing thickness 4mm.
Further, No. 30 iron wires of iron wire model in the step (3).
Comparative example 1: it is only that with the difference of embodiment 1 and shell outer layer slurry is replaced with into shell internal layer slurry, smearing thickness
It is constant.
Comparative example 2: it is only that with the difference of embodiment 1 and shell internal layer slurry is replaced with into shell outer layer slurry, smearing thickness
It is constant.
Comparative example 3: it is only that with the difference of embodiment 1 and silester-rosin complexing agent is replaced with into silica solution.
Comparative example 4: it is only that in shell internal layer slurry with the difference of embodiment 1 and does not add rare earth.
Test
The molten iron for pour to the investment casting shell of embodiment and the preparation of comparative example method identical equivalent, is made phase
The casting of same specification compares 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 of investment casting shell casting prepared by the present invention significantly improves.
It is prepared according to HB5352.1-86 " investment casting shell bending strength measurement method " measurement embodiment and comparative example
The residual strength of investment casting shell；Residual strength is that shell is entered furnace in 300 DEG C of conditions, is gradually heated to 1500 DEG C, is protected
Temperature 2 hours, is cooled to 300 DEG C or less 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, it is low to participate in intensity for investment casting shell prepared by the present invention.
Claims (1)
1. a kind of high-performance investment casting shell, which comprises the following steps:
(1) 500 mesh quartz sands, rare earth, silester-rosin complexing agent, activated bentonite are pressed into 100:0.15-0.18:6-8:
The mass ratio of 10-15 is uniformly admixed together, is added in high-speed mixer, is stirred, and obtains shell internal layer slurry, will
200 mesh quartz sands, silester-rosin complexing agent, activated bentonite are uniformly mixed by the mass ratio of 100:8-10:12-14
To together, it is added in high-speed mixer, is stirred, obtains shell outer layer slurry；
(2) the shell internal layer slurry prepared in step (1) is uniformly applied to wax pattern surface, after drying, then is uniformly smeared
Shell outer layer slurry, is then dried again, obtains cladding wax-pattern；
(3) the cladding wax pattern surface in step (2) is uniformly tied up using iron wire, it is fixed, then, stand 2 hours；
(4) by step (3) treated cladding wax-pattern is put into high temperature progress dewaxing processing, wax-pattern be completely melt after to get institute
Shell need to be cast；Rare earth is lanthanum chloride in the step (1)；Silester-rosin complexing agent preparation method in the step (1)
Are as follows: after melting rosin, the silester of 20 times of its quality is added, with 3500r/min revolving speed stirring 2 hours, then, then with
500r/min revolving speed stirs 30min, then adds the water of silester quality 50%, then stir 40min with 1500r/min revolving speed,
To obtain the final product；Activated bentonite in the step (1) is then naturally cold the preparation method comprises the following steps: bentonite is calcined 40min at 500 DEG C
But to after room temperature, grinding is distributed in deionized water after crossing 800 meshes, and the bentonite suspension that mass concentration is 10% is made,
The sulfuric acid solution that mass fraction is 10% is added into bentonite suspension, is adjusted bentonite suspension pH to 4.0, is heated to 60
DEG C, 40min is kept the temperature, mass fraction is then used to adjust bentonite suspension pH to neutrality, mistake for 5% sodium hydroxide solution again
Filter, drying to constant weight to get；Shell internal layer slurry is smeared in the step (2), smearing thickness 2-4mm smears shell outer layer
Slurry, smearing thickness 3-5mm；No. 30 iron wires of iron wire model in the step (3).
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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 true CN107520405B (en) | 2019-07-16 |
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Cited By (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 |
Families Citing this family (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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088495A (en) * | 1993-11-06 | 1994-06-29 | 南昌航空工业学院 | Rare-earth oxidate sodium silicate precision investment casting mould case and making thereof |
| CN1182655A (en) * | 1997-10-08 | 1998-05-27 | 冶金工业部钢铁研究总院 | Coating for casting thin foundry goods |
| CN103008546A (en) * | 2012-12-17 | 2013-04-03 | 遵义洪棣机械设备制造有限公司 | Manufacturing process of husking wheel |
| CN103044013A (en) * | 2011-10-13 | 2013-04-17 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation method of alumina ceramic shell for monocrystal blades |
| CN103286269A (en) * | 2013-06-17 | 2013-09-11 | 沈阳飞机工业（集团）有限公司 | Long rod type investment shell manufacturing process |
| JP2016002572A (en) * | 2014-06-18 | 2016-01-12 | 伊藤忠セラテック株式会社 | Slurry composition for manufacturing precision casting mold and manufacturing method of the same |
-
2017
- 2017-08-01 CN CN201710646429.1A patent/CN107520405B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088495A (en) * | 1993-11-06 | 1994-06-29 | 南昌航空工业学院 | Rare-earth oxidate sodium silicate precision investment casting mould case and making thereof |
| CN1182655A (en) * | 1997-10-08 | 1998-05-27 | 冶金工业部钢铁研究总院 | Coating for casting thin foundry goods |
| CN103044013A (en) * | 2011-10-13 | 2013-04-17 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation method of alumina ceramic shell for monocrystal blades |
| CN103008546A (en) * | 2012-12-17 | 2013-04-03 | 遵义洪棣机械设备制造有限公司 | Manufacturing process of husking wheel |
| CN103286269A (en) * | 2013-06-17 | 2013-09-11 | 沈阳飞机工业（集团）有限公司 | Long rod type investment shell manufacturing process |
| JP2016002572A (en) * | 2014-06-18 | 2016-01-12 | 伊藤忠セラテック株式会社 | Slurry composition for manufacturing precision casting mold and manufacturing method of the same |
Cited By (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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