CN111558692A - Composite investment casting shell making process - Google Patents
Composite investment casting shell making process Download PDFInfo
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- CN111558692A CN111558692A CN202010391862.7A CN202010391862A CN111558692A CN 111558692 A CN111558692 A CN 111558692A CN 202010391862 A CN202010391862 A CN 202010391862A CN 111558692 A CN111558692 A CN 111558692A
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- layer
- coating
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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
-
- 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
-
- 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
Abstract
The invention discloses a composite investment casting shell making process, which comprises the following steps: preparing a surface layer shell, preparing a middle layer shell and preparing a reinforcing layer shell; according to the invention, the surface layer shell, the middle layer shell and the reinforcing layer shell are prepared layer by adopting unique process, parameters and coating, so that the composite melting model shell with good stability and high qualification rate is obtained.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a shell making process for composite investment casting.
Background
Investment casting, also known as lost-wax casting, generally refers to a casting scheme in which a fusible material is made into a pattern, a plurality of layers of refractory materials are coated on the surface of the pattern to make a shell, the pattern is melted and discharged from the shell, so that a casting mold without a parting surface is obtained, and the casting mold is roasted at a high temperature and then filled with sand for pouring. Investment casting is often referred to as "lost wax casting" because patterns are widely made from waxy materials. In the prior art, the composite shell made of the water glass and the silica sol can be combined with the advantages of the water glass and the silica sol to overcome the defects of the water glass and the silica sol, and the application is wider and wider, but the shell made by the existing composite shell making process has poor stability and low percent of pass. Therefore, a composite investment casting shell making process is provided.
Disclosure of Invention
The invention mainly aims to provide a composite investment casting shell making process, the prepared shell has good stability and high qualification rate, and the problems in the background technology can be effectively solved.
In order to achieve the purpose, the invention adopts the technical scheme that: a composite investment casting shell making process is characterized in that: the method comprises the following steps:
silica sol shell preparation
1) Preparation of the facing layer
After the surface layer coating is prepared, uniformly stirring to check the viscosity of the coating;
ii, if the fine part on the surface of the module has a character part, brushing the fine part uniformly by using a brush arrangement slurry in advance;
tilting the die set to slowly intrude the surface layer coating until the coating is flush with the lower edge of the flange of the riser cup of the die set, and repeatedly infiltrating up and down;
iv, lifting the module at a slight speed, slightly turning, dripping redundant paint, and brushing the part without the paint by using a pen to dip slurry;
blowing out air bubbles by using low-pressure compressed air to blow away the fonts and the coatings accumulated at other parts;
the module is used for spraying sand or manually spreading sand to prepare a shell through a mesh screen, and a sand leakage position needs to be supplemented in time;
placing the module on a frame, leaving a certain gap between the modules, and naturally drying the surface layer for 6-12 hours;
blowing away floating sand on the surface layer by using soft wind, and repairing and brushing surface layer paint at the damaged position of the surface layer shell;
2) two-layer preparation
Slightly obliquely immersing the module into the two layers of coatings until the coatings are flush with the lower edge of the flanging of the riser cup of the module;
taking out the module, slightly turning, dripping redundant paint, and blowing off the paint accumulated at the holes and other places by compressed air or brushing the paint;
uniformly sanding the second layer of manual work, lightly placing the modules on a rack or a production line, and keeping a certain gap between the modules, wherein the deep long hole holes of the modules are opposite to the wind direction of a fan;
3) three-layer preparation: the three-layer preparation method is the same as the two-layer preparation method;
preparation of water glass shell
1) Preparation of four layers
Before coating, checking that the viscosity of the coating meets the requirement, immersing the module into a fourth layer of coating bucket until the coating is flush with the lower edge of a flange of a riser cup of the module, and slightly rotating;
uniformly sanding manually, slowly putting the sanded module into a hardening pool, slightly rotating obliquely, preliminarily hardening, slightly dropping the module on the bottom of the pool, and stably putting;
iii, after hardening for 15-30 minutes, lifting the module out, stably placing the module at the side of the pool, and air-drying for 30-40 minutes;
2) five-layer preparation: the preparation method of the five layers is the same as that of the four layers;
3) preparing a reinforcing layer: the preparation method of the reinforcing layer is the same as that of the four layers;
preferably, the dewaxing is performed 12 hours after the reinforcement shell is hardened.
Preferably, the surface layer coating is white corundum slurry powder, and specifically comprises 390 parts of corundum powder of 330-.
Preferably, the preparation process of the surface coating comprises the following specific steps:
adding silica sol for a surface layer into a slurry dipping machine, and starting the slurry dipping machine to operate;
II, adding JFC slowly according to the proportion, and mixing uniformly;
III, slowly adding the white corundum powder into the barrel, and scraping off the powder scattered on the barrel wall and the blades by using a scraper;
iv, stirring for 1-2 hours after the powder is added, adding n-octanol, stirring for 10 minutes, detecting the viscosity by using a flow cup, adjusting the viscosity by using the powder or silica sol, and determining a viscosity parameter according to the environmental temperature and the coating performance;
and v, after the viscosity is properly adjusted, continuing stirring for 6-8 hours for later use.
Preferably, the two-layer coating and the three-layer coating are both mullite slurry powder, and specifically comprise 130-160 parts of mullite powder and 100 parts of silica sol for a back layer.
Preferably, the preparation process of the two-layer coating and the three-layer coating comprises the following specific steps:
adding silica sol for a back layer into a slurry dipping machine, and starting the slurry dipping machine to operate;
II, slowly adding mullite powder into the barrel, and scraping the powder scattered on the barrel wall and the blades by a scraper;
stirring for 1-2 hours after the powder is added, detecting the viscosity by using a flow cup, adjusting the viscosity by using the powder, and determining a viscosity parameter according to the environmental temperature and the coating performance;
iv, after the viscosity is properly adjusted, stirring is continued for 6-8 hours for later use.
Preferably, the four-layer coating comprises 110-140 parts of mullite powder and 100 parts of water glass, the five-layer coating comprises 120-160 parts of mullite powder and 100 parts of water glass, and the reinforcing layer coating comprises 130-180 parts of mullite powder and 100 parts of water glass.
Preferably, the preparation process of the three-layer four-layer and reinforcing layer coating comprises the following specific steps: adding water into water glass in a plastic barrel, stirring for 1-2 minutes, diluting until the density is 1.32-1.35g/cm3, and pouring the diluted water glass into a batching barrel; slowly adding mullite powder into the barrel under mechanical stirring, and stirring at high speed for 30-60 minutes until the coating is uniform; the viscosity was measured with a flow cup and the formulation viscosity was slightly lower than the calculated value.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the surface layer shell, the middle layer shell and the reinforcing layer shell are prepared layer by adopting unique process, parameters and coating, so that the composite melting model shell with good stability and high qualification rate is obtained.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
A composite investment casting shell making process is characterized in that: the method comprises the following steps:
silica sol shell preparation
1) Preparation of the facing layer
After the surface layer coating is prepared, uniformly stirring to check the viscosity of the coating;
ii, if the fine part on the surface of the module has a character part, brushing the fine part uniformly by using a brush arrangement slurry in advance;
tilting the die set to slowly intrude the surface layer coating until the coating is flush with the lower edge of the flange of the riser cup of the die set, and repeatedly infiltrating up and down;
iv, lifting the module at a slight speed, slightly turning, dripping redundant paint, and brushing the part without the paint by using a pen to dip slurry;
blowing out air bubbles by using low-pressure compressed air to blow away the fonts and the coatings accumulated at other parts;
the module is used for spraying sand or manually spreading sand to prepare a shell through a mesh screen, and a sand leakage position needs to be supplemented in time;
placing the module on a frame, leaving a certain gap between the modules, and naturally drying the surface layer for 6-12 hours;
blowing away floating sand on the surface layer by using soft wind, and repairing and brushing surface layer paint at the damaged position of the surface layer shell;
2) two-layer preparation
Slightly obliquely immersing the module into the two layers of coatings until the coatings are flush with the lower edge of the flanging of the riser cup of the module;
taking out the module, slightly turning, dripping redundant paint, and blowing off the paint accumulated at the holes and other places by compressed air or brushing the paint;
uniformly sanding the second layer of manual work, lightly placing the modules on a rack or a production line, and keeping a certain gap between the modules, wherein the deep long hole holes of the modules are opposite to the wind direction of a fan;
3) three-layer preparation: the three-layer preparation method is the same as the two-layer preparation method;
preparation of water glass shell
1) Preparation of four layers
Before coating, checking that the viscosity of the coating meets the requirement, immersing the module into a fourth layer of coating bucket until the coating is flush with the lower edge of a flange of a riser cup of the module, and slightly rotating;
uniformly sanding manually, slowly putting the sanded module into a hardening pool, slightly rotating obliquely, preliminarily hardening, slightly dropping the module on the bottom of the pool, and stably putting;
iii, after hardening for 15-30 minutes, lifting the module out, stably placing the module at the side of the pool, and air-drying for 30-40 minutes;
2) five-layer preparation: the preparation method of the five layers is the same as that of the four layers;
3) preparing a reinforcing layer: the preparation method of the reinforcing layer is the same as that of the four layers;
in this embodiment, the dewaxing is performed 12 hours after the reinforcement shell is cured.
In this embodiment, the surface layer coating is white corundum slurry powder, and specifically includes 330-390 parts of corundum powder, 100 parts of silica sol for the surface layer, 0.1% of JFC and 0.03-0.05% of n-octanol.
In this embodiment, the preparation process of the top coating specifically comprises the following steps:
adding silica sol for a surface layer into a slurry dipping machine, and starting the slurry dipping machine to operate;
II, adding JFC slowly according to the proportion, and mixing uniformly;
III, slowly adding the white corundum powder into the barrel, and scraping off the powder scattered on the barrel wall and the blades by using a scraper;
iv, stirring for 1-2 hours after the powder is added, adding n-octanol, stirring for 10 minutes, detecting the viscosity by using a flow cup, adjusting the viscosity by using the powder or silica sol, and determining a viscosity parameter according to the environmental temperature and the coating performance;
and v, after the viscosity is properly adjusted, continuing stirring for 6-8 hours for later use.
In this embodiment, the two-layer coating and the three-layer coating are both mullite slurry powder, and specifically include 160 parts of mullite powder and 100 parts of silica sol for the back layer.
In this embodiment, the preparation process of the two-layer coating and the three-layer coating specifically comprises the following steps:
adding silica sol for a back layer into a slurry dipping machine, and starting the slurry dipping machine to operate;
II, slowly adding mullite powder into the barrel, and scraping the powder scattered on the barrel wall and the blades by a scraper;
stirring for 1-2 hours after the powder is added, detecting the viscosity by using a flow cup, adjusting the viscosity by using the powder, and determining a viscosity parameter according to the environmental temperature and the coating performance;
iv, after the viscosity is properly adjusted, stirring is continued for 6-8 hours for later use.
In this embodiment, the four-layer coating comprises 140 parts of mullite powder and 100 parts of water glass by weight, the five-layer coating comprises 160 parts of mullite powder and 100 parts of water glass by weight, and the reinforcing layer coating comprises 180 parts of mullite powder and 130 parts of water glass by weight
Mullite powder and 100 parts of water glass.
In this embodiment, the preparation process of the three-layer four-layer and reinforced layer coating specifically comprises the following steps: adding water into water glass in a plastic barrel, stirring for 1-2 minutes, diluting until the density is 1.32-1.35g/cm3, and pouring the diluted water glass into a batching barrel; slowly adding mullite powder into the barrel under mechanical stirring, and stirring at high speed for 30-60 minutes until the coating is uniform; the viscosity was measured with a flow cup and the formulation viscosity was slightly lower than the calculated value.
The surface layer shell, the middle layer shell and the reinforcing layer shell are prepared layer by combining the process parameters of the following table 1-1 with the process flow and the method, and the preparation of the composite investment shell is completed.
TABLE 1-1
Preparation of hardening liquid: according to the ratio of water to crystalline aluminum chloride of 1: weighing raw materials according to the proportion of 0.45-0.55, pouring water into a hardening tank, adding crystalline aluminum chloride, and continuously stirring to dissolve the crystalline aluminum chloride to obtain the required crystalline aluminum chloride hardening liquid.
The hardening liquid in the crystalline aluminum chloride hardening liquid has the specific weight of 1.17-1.22 and the content of ALO of 6-7.5 percent.
Tables 1-2 show the preparation parameters of the coatings
Tables 1 to 2
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the foregoing description is illustrative in nature and is not to be construed as limiting the scope of the invention as claimed.
Claims (8)
1. A composite investment casting shell making process is characterized in that: the method comprises the following steps:
silica sol shell preparation
1) Preparation of the facing layer
After the surface layer coating is prepared, uniformly stirring to check the viscosity of the coating;
ii, if the fine part on the surface of the module has a character part, brushing the fine part uniformly by using a brush arrangement slurry in advance;
tilting the die set to slowly intrude the surface layer coating until the coating is flush with the lower edge of the flange of the riser cup of the die set, and repeatedly infiltrating up and down;
iv, lifting the module at a slight speed, slightly turning, dripping redundant paint, and brushing the part without the paint by using a pen to dip slurry;
blowing out air bubbles by using low-pressure compressed air to blow away the fonts and the coatings accumulated at other parts;
the module is used for spraying sand or manually spreading sand to prepare a shell through a mesh screen, and a sand leakage position needs to be supplemented in time;
placing the module on a frame, leaving a certain gap between the modules, and naturally drying the surface layer for 6-12 hours;
blowing away floating sand on the surface layer by using soft wind, and repairing and brushing surface layer paint at the damaged position of the surface layer shell;
2) two-layer preparation
Slightly obliquely immersing the module into the two layers of coatings until the coatings are flush with the lower edge of the flanging of the riser cup of the module;
taking out the module, slightly turning, dripping redundant paint, and blowing off the paint accumulated at the holes and other places by compressed air or brushing the paint;
uniformly sanding the second layer of manual work, lightly placing the modules on a rack or a production line, and keeping a certain gap between the modules, wherein the deep long hole holes of the modules are opposite to the wind direction of a fan;
3) three-layer preparation: the three-layer preparation method is the same as the two-layer preparation method;
preparation of water glass shell
1) Preparation of four layers
Before coating, checking that the viscosity of the coating meets the requirement, immersing the module into a fourth layer of coating bucket until the coating is flush with the lower edge of a flange of a riser cup of the module, and slightly rotating;
uniformly sanding manually, slowly putting the sanded module into a hardening pool, slightly rotating obliquely, preliminarily hardening, slightly dropping the module on the bottom of the pool, and stably putting;
iii, after hardening for 15-30 minutes, lifting the module out, stably placing the module at the side of the pool, and air-drying for 30-40 minutes;
2) five-layer preparation: the preparation method of the five layers is the same as that of the four layers;
3) preparing a reinforcing layer: the reinforcing layer is prepared in the same way as the four layers.
2. The composite investment casting shell-making process according to claim 1, wherein: and dewaxing is carried out after the reinforcing layer shell is hardened for 12 hours.
3. The composite investment casting shell-making process according to claim 1, wherein: the surface layer coating is white corundum slurry powder, and specifically comprises 390 portions of 330-corundum powder, 100 portions of silica sol for the surface layer, 0.1% of JFC and 0.03-0.05% of n-octanol.
4. The composite investment casting shell-making process according to claim 3, wherein: the preparation process of the surface coating comprises the following specific steps:
adding silica sol for a surface layer into a slurry dipping machine, and starting the slurry dipping machine to operate;
II, adding JFC slowly according to the proportion, and mixing uniformly;
III, slowly adding the white corundum powder into the barrel, and scraping off the powder scattered on the barrel wall and the blades by using a scraper;
iv, stirring for 1-2 hours after the powder is added, adding n-octanol, stirring for 10 minutes, detecting the viscosity by using a flow cup, adjusting the viscosity by using the powder or silica sol, and determining a viscosity parameter according to the environmental temperature and the coating performance;
and v, after the viscosity is properly adjusted, continuing stirring for 6-8 hours for later use.
5. The composite investment casting shell-making process according to claim 1, wherein: the two-layer coating and the three-layer coating are both mullite slurry powder, and specifically comprise 160 parts of mullite powder of 130 and 100 parts of silica sol for a back layer.
6. The composite investment casting shell-making process according to claim 5, wherein: the preparation process of the two-layer coating and the three-layer coating comprises the following specific steps:
adding silica sol for a back layer into a slurry dipping machine, and starting the slurry dipping machine to operate;
II, slowly adding mullite powder into the barrel, and scraping the powder scattered on the barrel wall and the blades by a scraper;
stirring for 1-2 hours after the powder is added, detecting the viscosity by using a flow cup, adjusting the viscosity by using the powder, and determining a viscosity parameter according to the environmental temperature and the coating performance;
iv, after the viscosity is properly adjusted, stirring is continued for 6-8 hours for later use.
7. The composite investment casting shell-making process according to claim 1, wherein: the four-layer coating comprises 140 parts of mullite powder and 100 parts of water glass 110-.
8. The composite investment casting shell-making process according to claim 7, wherein: the preparation process of the three-layer four-layer and reinforcing layer coating comprises the following specific steps: adding water into water glass in a plastic barrel, stirring for 1-2 minutes, diluting until the density is 1.32-1.35g/cm3, and pouring the diluted water glass into a batching barrel; slowly adding mullite powder into the barrel under mechanical stirring, and stirring at high speed for 30-60 minutes until the coating is uniform; the viscosity was measured with a flow cup and the formulation viscosity was slightly lower than the calculated value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391862.7A CN111558692A (en) | 2020-05-11 | 2020-05-11 | Composite investment casting shell making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391862.7A CN111558692A (en) | 2020-05-11 | 2020-05-11 | Composite investment casting shell making process |
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| CN111558692A true CN111558692A (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010391862.7A Withdrawn CN111558692A (en) | 2020-05-11 | 2020-05-11 | Composite investment casting shell making process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178486A (en) * | 2021-12-14 | 2022-03-15 | 贵阳航发精密铸造有限公司 | Shell for improving sand adhesion on surface of cast high-temperature alloy and preparation method thereof |
| CN115178708A (en) * | 2022-06-27 | 2022-10-14 | 惠州市棣华科技有限公司 | Precision casting shell and manufacturing process thereof |
-
2020
- 2020-05-11 CN CN202010391862.7A patent/CN111558692A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178486A (en) * | 2021-12-14 | 2022-03-15 | 贵阳航发精密铸造有限公司 | Shell for improving sand adhesion on surface of cast high-temperature alloy and preparation method thereof |
| CN114178486B (en) * | 2021-12-14 | 2024-04-09 | 贵阳航发精密铸造有限公司 | Shell for improving sand sticking on surface of high-temperature alloy after casting and preparation method thereof |
| CN115178708A (en) * | 2022-06-27 | 2022-10-14 | 惠州市棣华科技有限公司 | Precision casting shell and manufacturing process thereof |
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Application publication date: 20200821 |