CN113442265A - Drainage groove investment casting forming method - Google Patents
Drainage groove investment casting forming method Download PDFInfo
- Publication number
- CN113442265A CN113442265A CN202110731810.4A CN202110731810A CN113442265A CN 113442265 A CN113442265 A CN 113442265A CN 202110731810 A CN202110731810 A CN 202110731810A CN 113442265 A CN113442265 A CN 113442265A
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- CN
- China
- Prior art keywords
- fire
- coating
- refractory
- resistant
- investment casting
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/54—Producing shaped prefabricated articles from the material specially adapted for producing articles from molten material, e.g. slag refractory ceramic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
Abstract
The invention provides a drainage groove investment casting forming method, which comprises the following steps: preparing a wax mould; coating the fire-resistant coating A on the outer surface of the wax mould, and naturally drying to form a fire-resistant layer A; coating the fire-resistant coating B on the outer surface of the fire-resistant layer A, and naturally drying to form a fire-resistant layer B; coating the fire-resistant coating C on the outer surface of the fire-resistant layer B, and naturally drying to form a fire-resistant layer C; and heating to remove the wax pattern, and then roasting to enable the refractory layer A, the refractory layer B and the refractory layer C to be fused and shaped to form the drainage groove. By adopting the technical scheme of the invention, a plurality of layers of refractory coatings are coated and hung in the manufacturing process, and the main components in the refractory coatings are a large amount of white corundum powder and mullite powder, so that compared with bauxite commonly used in the prior art, the structural strength and the high-temperature resistance of the drainage groove are improved, and the refractory coatings are integrated after high-temperature roasting, so that the drainage groove material can be prevented from falling off, and a foundation is laid for improving the molding quality of castings.
Description
Technical Field
The invention relates to the technical field of casting processes, in particular to a drainage groove investment casting forming method.
Background
At present, a gravity pouring mode is widely adopted in an investment casting molding process of alloy materials, a large amount of molten metal is needed for smelting and pouring of large castings, the flow rate is large, in order to avoid the phenomenon that a formwork is broken in the pouring process due to the fact that large-flow molten metal directly impacts a shell, a drainage groove is used for transition in production, so that the impact of the molten metal on the formwork is relieved, and the molten metal stably and orderly enters the formwork to fill the formwork. The existing drainage grooves are generally made of bauxite and silica sol which belong to flexible materials, the strength of the prepared drainage grooves is poor, and after the drainage grooves are repeatedly used for many times, the bauxite in the materials is easy to fall off and is injected into a shell along with an alloy material, so that the finally obtained casting has inclusion defects and the molding quality of the casting is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a drainage groove investment casting forming method.
The invention is realized by the following technical scheme.
The invention provides a drainage groove investment casting forming method, which comprises the following steps:
the method comprises the following steps: preparing a wax mould;
step two: preparing a fire-resistant coating A, coating the fire-resistant coating A on the outer surface of the wax mould in the step one, and naturally drying to form a fire-resistant layer A;
step three; preparing a fire-resistant coating B, coating the fire-resistant coating B on the outer surface of the fire-resistant layer A in the step two, and naturally drying to form a fire-resistant layer B;
step four; preparing a fire-resistant coating C, coating the fire-resistant coating C on the outer surface of the fire-resistant layer B in the third step, and naturally drying to form a fire-resistant layer C;
step five: and heating to remove the wax pattern, and then roasting to fuse and shape the refractory layer A, the refractory layer B and the refractory layer C to form the drainage groove.
In the second step, the refractory coating A is prepared by uniformly mixing white corundum powder with the fine particle size of 320 meshes and silica sol according to the mass ratio of 1: 3.
And in the second step, the drying time of the fire-resistant coating A is not less than 4 hours.
And in the second step, before the refractory coating A is dried, a proper amount of white corundum sand powder with the fine particle size of 100 meshes is sprayed on the surface of the refractory coating A.
And step three, the refractory coating B is prepared by uniformly mixing mullite powder and silica sol according to the mass ratio of 1: 6.
And in the third step, the drying time of the fire-resistant coating B is not less than 6 hours.
Before the refractory coating B is dried in the third step, a proper amount of mullite powder with the fine particle size of 30-60 meshes is also sprayed on the surface of the refractory coating B.
And step four, the refractory coating C is prepared by uniformly mixing mullite powder and silica sol according to the mass ratio of 1: 2.
In the fourth step, the drying time of the fire-resistant coating C is not less than 6 hours.
Before the refractory coating C is dried in the third step, a proper amount of mullite powder with the fine particle size of 10-20 meshes is sprayed on the surface of the refractory coating C.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the drainage groove is prepared by adopting an investment casting process, and a plurality of layers of refractory coatings are coated and hung in the manufacturing process, and the main components in the refractory coatings are a large amount of white corundum powder and mullite powder.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention after step four.
In the figure: 1-wax pattern, 2-flame retardant coating A, 3-flame retardant coating B, 4-flame retardant coating C, 11-leading-in section, 12-transition section and 13-leading-out section.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1 and 2, the invention provides a drainage groove investment casting forming method, which comprises the following steps:
the method comprises the following steps: preparing a wax mould 1;
step two: preparing a fire-resistant coating A, coating the fire-resistant coating A on the outer surface of the wax mould 1 in the first step, and naturally drying to form a fire-resistant layer A2; further, in the second step, the refractory coating A is prepared by uniformly mixing the white corundum powder with the fine particle size of 320 meshes and the silica sol according to the mass ratio of 1: 3. In the second step, the drying time of the refractory coating A is not less than 4 hours. Before the refractory coating A is dried in the second step, a proper amount of white corundum sand powder with the fine particle size of 100 meshes is sprayed on the surface of the refractory coating A.
Step three; preparing a fire-resistant coating B, coating the fire-resistant coating B on the outer surface of the fire-resistant layer A2 in the step two, and naturally drying to form a fire-resistant layer B3; further, the refractory coating B in the third step is prepared by uniformly mixing mullite powder and silica sol according to the mass ratio of 1: 6. In the third step, the drying time of the fire-resistant coating B is not less than 6 hours. Before the refractory coating B is dried in the third step, a proper amount of mullite powder with the fine particle size of 30-60 meshes is also sprayed on the surface of the refractory coating B.
Step four; preparing a fire-resistant coating C, coating the fire-resistant coating C on the outer surface of the fire-resistant layer B3 in the step three, and naturally drying to form a fire-resistant layer C4; further, the refractory coating C in the fourth step is prepared by uniformly mixing mullite powder and silica sol according to the mass ratio of 1: 2. In the fourth step, the drying time of the fire-resistant coating C is not less than 6 hours. Before the refractory coating C is dried in the third step, a proper amount of mullite powder with the fine particle size of 10-20 meshes is also sprayed on the surface of the refractory coating C.
Step five: and heating to remove the wax mold 1, and then roasting to fuse and shape the fire-resistant layer A2, the fire-resistant layer B3 and the fire-resistant layer C4 to form the drainage groove.
In addition, the drainage groove investment casting forming method further comprises the following steps: repeating step two at least twice before step three. The drainage groove investment casting forming method further comprises the following steps: repeating step four at least three times before performing step five. By repeatedly coating the fire-resistant coating A and the fire-resistant coating C for multiple times, the structural strength of the formed drainage groove is improved.
In addition, the wax mould 1 comprises an introduction section 11, a transition section 12 and a derivation section 13 which are sequentially arranged from top to bottom, wherein the introduction section 11 and the derivation section 13 are both in a cylindrical shape, and the outer diameter of the introduction section 11 is larger than that of the derivation section 13. The wax pattern 1 is in a funnel shape with a large upper part and a small lower part as a whole.
By adopting the technical scheme of the invention, the drainage groove is prepared by adopting an investment casting process, and a plurality of layers of refractory coatings are coated and hung in the manufacturing process, and the main components in the refractory coatings are a large amount of white corundum powder and mullite powder.
Claims (10)
1. The drainage groove investment casting molding method is characterized in that: the method comprises the following steps:
the method comprises the following steps: preparing a wax mould (1);
step two: preparing a fire-resistant coating A, coating the fire-resistant coating A on the outer surface of the wax mould (1) in the step one, and naturally drying to form a fire-resistant layer A (2);
step three; preparing a fire-resistant coating B, coating the fire-resistant coating B on the outer surface of the fire-resistant layer A (2) in the step two, and naturally drying to form a fire-resistant layer B (3);
step four; preparing a fire-resistant coating C, coating the fire-resistant coating C on the outer surface of the fire-resistant layer B (3) in the step three, and naturally drying to form a fire-resistant layer C (4);
step five: and heating to remove the wax mold (1), and then roasting to fuse and shape the refractory layer A (2), the refractory layer B (3) and the refractory layer C (4) to form a drainage groove.
2. The method of investment casting drainage duct of claim 1, wherein: in the second step, the refractory coating A is prepared by uniformly mixing white corundum powder with the fine particle size of 320 meshes and silica sol according to the mass ratio of 1: 3.
3. The method of investment casting drainage duct of claim 1, wherein: and in the second step, the drying time of the fire-resistant coating A is not less than 4 hours.
4. The method of investment casting drainage duct of claim 3, wherein: and in the second step, before the refractory coating A is dried, a proper amount of white corundum sand powder with the fine particle size of 100 meshes is sprayed on the surface of the refractory coating A.
5. The method of investment casting drainage duct of claim 1, wherein: and step three, the refractory coating B is prepared by uniformly mixing mullite powder and silica sol according to the mass ratio of 1: 6.
6. The method of investment casting drainage duct of claim 1, wherein: and in the third step, the drying time of the fire-resistant coating B is not less than 6 hours.
7. The method of investment casting drainage duct of claim 1, wherein: before the refractory coating B is dried in the third step, a proper amount of mullite powder with the fine particle size of 30-60 meshes is also sprayed on the surface of the refractory coating B.
8. The method of investment casting drainage duct of claim 1, wherein: and step four, the refractory coating C is prepared by uniformly mixing mullite powder and silica sol according to the mass ratio of 1: 2.
9. The method of investment casting drainage duct of claim 1, wherein: in the fourth step, the drying time of the fire-resistant coating C is not less than 6 hours.
10. The method of investment casting drainage duct of claim 1, wherein: before the refractory coating C is dried in the third step, a proper amount of mullite powder with the fine particle size of 10-20 meshes is sprayed on the surface of the refractory coating C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731810.4A CN113442265A (en) | 2021-06-29 | 2021-06-29 | Drainage groove investment casting forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731810.4A CN113442265A (en) | 2021-06-29 | 2021-06-29 | Drainage groove investment casting forming method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113442265A true CN113442265A (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110731810.4A Pending CN113442265A (en) | 2021-06-29 | 2021-06-29 | Drainage groove investment casting forming method |
Country Status (1)
| Country | Link |
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| CN (1) | CN113442265A (en) |
Cited By (1)
| 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 |
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2021
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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 |
| 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 |
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Application publication date: 20210928 |
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