CN114042858B - Method for self-collapsing high-strength lost foam cavity carbonless casting mold along with casting cooling - Google Patents
Method for self-collapsing high-strength lost foam cavity carbonless casting mold along with casting cooling Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000006260 foam Substances 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 title claims abstract description 13
- 239000010410 layer Substances 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 40
- 239000002344 surface layer Substances 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 238000005345 coagulation Methods 0.000 claims abstract description 11
- 230000015271 coagulation Effects 0.000 claims abstract description 11
- 238000002309 gasification Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 22
- 239000004567 concrete Substances 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 15
- 241000196324 Embryophyta Species 0.000 claims description 14
- 238000011049 filling Methods 0.000 claims description 14
- 244000035744 Hura crepitans Species 0.000 claims description 13
- 238000010114 lost-foam casting Methods 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 235000019353 potassium silicate Nutrition 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 4
- 238000007527 glass casting Methods 0.000 claims description 4
- 229910052850 kyanite Inorganic materials 0.000 claims description 4
- 239000010443 kyanite Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005495 investment casting Methods 0.000 abstract description 8
- 239000012188 paraffin wax Substances 0.000 abstract description 2
- 239000004794 expanded polystyrene Substances 0.000 description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011821 neutral refractory Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
-
- 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)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a method for automatically collapsing a high-strength lost foam cavity carbonless casting mold along with casting cooling, which comprises the following steps: preparing and coating a fluid or wet coagulation material: the aggregate is divided into a surface layer material and a back layer material which are respectively prepared by different components; EPS pattern and aggregate composite modeling; initial setting of casting mold; drying the casting mould and gasifying the EPS pattern to form a carbon-free cavity, thereby obtaining a cavity casting mould; pouring molten metal to obtain the casting. The method can simplify the working procedure, improve the working efficiency and the operation reliability, is environment-friendly, has little pollution, and breaks through the limitation that the gasification empty shell method for coating the multi-layer coating on the paraffin wax investment casting and the lost foam EPS pattern can only be suitable for producing small castings.
Description
Technical Field
The invention relates to the technical field of lost foam casting, in particular to a method for automatically collapsing a high-strength lost foam cavity carbonless casting mold along with casting cooling.
Background
The lost foam casting is an advanced process technology with high efficiency in 21 st century, more than 4000 lost foam casting enterprises exist in China, wherein more than 1500 lost foam casting adopts a process of burning out oxygen-enriched air under negative pressure of dry sand and then pouring molten metal, such as the lost foam casting disclosed in China patent publication No. CN101690976A adopts a method of cold eliminating carbon defects by adopting high-performance coating negative pressure burning air-injection flow rate, the method has great breakthrough and advancement compared with the traditional solid casting, the carburetion defect of the steel lost foam casting is well eliminated and controlled, but due to the limitations of burning-out time and different casting structures and sizes, the polystyrene foam (Expanded Polystyrene, EPS) in the lost foam is difficult to burn completely in the lost foam generally, the burning-out air is in the range of 80-95%, namely more than 5% of residual carbon is still present, that is to say, the threat of micro carburetion is still present, and the special castings of high-requirement castings such as armatures, high iron, aviation equipment and the like cannot meet the requirement, and the full vaporization of the lost foam can not realize the complete vaporization of the residual carbon in the lost foam at 500 ℃ at the temperature. If the investment casting imitation shell method is implemented, the investment casting water glass or silica sol paint is adopted, the process is complex, the production period is long, the pollution in the process of solidifying and roasting the coating is serious, the energy consumption is remarkable, the ventilation of the shell can be ensured only by roasting the coating for a long time at the temperature of more than 1000 ℃, and the paint is not easy to remove sand and clean, so that the investment casting water glass or silica sol paint belongs to a 'low-slow-difference cost' lag process. In 4000 lost foam casting plants in the whole country, almost all the plants usually need to produce castings with high quality requirements and strict control of carbon components, in particular castings of low carbon steel, low carbon alloy steel and the like, in single or small batches or large batches. Therefore, the EPS gasification empty shell carbonless casting technology is a real problem which is forced to be solved by national and international lost foam casting.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a method for automatically collapsing a high-strength lost foam cavity carbonless casting mold along with casting cooling. The method can simplify the working procedure, improve the working efficiency and the operation reliability, is environment-friendly, has little pollution, and breaks through the limitation that the gasification empty shell method for coating the multi-layer coating on the paraffin wax investment casting and the lost foam EPS pattern can only be suitable for producing small castings.
The technical scheme for realizing the purpose of the invention is as follows:
a method for automatically collapsing a high-strength lost foam cavity carbonless casting mold along with casting cooling comprises the following steps:
S1, preparing and coating a fluid or wet coagulation material:
The aggregate is divided into a surface layer material and a back layer material, which are respectively prepared by different components:
s1-1, preparing a surface layer fluid state aggregate, wherein the components in percentage by weight are as follows:
15-25% of ordinary cement, 71-81% of kyanite, 1% of polyacrylamide, 1% of plant powder and 2% of alpha starch, sieving the raw materials with a 150-200 mesh sieve, mixing, adding water accounting for 50-80% of the total weight ratio of the 5 materials, and stirring for 15-25 min to form a fluid or toothpaste-like aggregate;
s1-2, preparing a backing layer wet state aggregate, wherein the backing layer wet state aggregate comprises the following components in percentage by weight:
20-30% of ordinary cement, 69-79% of 20-100 mesh filling sand material and 1% of plant powder, wherein the granularity of the plant powder is 0.5-3 mm, and after mixing, water accounting for 15-25% of the total weight of the 3 materials is added, and stirring is carried out for 8-12 min to form wet coagulation material;
s2, EPS pattern and aggregate composite modeling:
brushing or scraping (similar to putty) the surface layer aggregate on the surface of the EPS model, and transferring to the next procedure when the thickness of the surface layer aggregate reaches 3-4 mm in a wet state without creep:
Placing the EPS model attached with the surface layer concrete material into a sand box to fill the back layer concrete material for modeling;
s3, initial setting of casting mold:
After the composite molding process is finished, the composite molding process is placed for more than 6 hours for natural solidification, a solid mold with better strength is formed, and the composite molding process is placed at normal temperature for more than 24 hours;
S4, drying the casting mould and gasifying an EPS pattern to form a carbon-free cavity:
placing the solid mould in a gasification furnace with controllable temperature of 600-650 ℃, quickly gasifying and pyrolyzing an EPS pattern, and obtaining a cavity mould after full gasification;
S5, pouring molten metal:
Pouring molten metal after the cavity casting mold is taken out of the furnace to obtain a casting.
Further, in S1-2, the filling sand material is one or more of waste slag, waste refractory bricks, waste water glass casting sand and reused lost foam casting filling dry sand.
Further, in S2, during molding, the sand box is placed on a flat plate, a layer of backing layer concrete with the thickness of 4-5 cm is padded on the inner bottom surface of the sand box, and then the EPS pattern is placed on a backing layer concrete cushion layer, so that wet and fluid backing layer concrete sand box composite molding can be filled.
In S4, the gasification time in the furnace is more than 30 min.
The present invention uses ordinary silicate cement as cement for casting mould, and prepares two different kinds of aggregate in fluid state and wet state, one kind of aggregate is coated on the surface of EPS mould, then another kind of aggregate is used for filling and forming, after solidifying for a certain time, the EPS mould is baked at 600-650 deg.C, so that the EPS mould can be fully gasified, and the high-strength casting mould with no carbon in cavity can be formed.
The invention has the characteristics, effects and advantages that:
1. The main components of the ordinary silicate cement are silicate, including dicalcium silicate, tricalcium silicate and tetracalcium aluminoferrite, wherein the tetracalcium aluminoferrite contains Al 2O3 and Fe 2O3, has an anti-sand effect, has a high melting point (2130 ℃) of dicalcium silicate, always accompanies the crystal transformation from beta-2 CaO.SiO 2 to gamma-2 CaO.SiO 2 in the process of cooling from high temperature to 675 ℃ to complete cooling, has a strong reaction, has a volume expansion rate of 10%, is beneficial to eliminating shrinkage crack defects of castings due to self-collapse of casting mold, is very easy to clean and remove sand, has little free SO 2 silicon dust, and is a casting material with excellent performance and little use before the casting production field;
2. The Polyacrylamide (PAM) in the surface layer coagulation material has good flocculation property, thickening property, adhesiveness and resistance to degradation, is neutral and nontoxic, and the PAM and alpha starch are matched to be favorable for improving the adhesiveness and the coverage uniformity of the surface layer slurry coagulation material on the surface of an EPS model; the addition of the plant powder is beneficial to improving the air permeability and the crack resistance; is a neutral refractory material with strong steel liquid infiltration resistance, small expansion coefficient and good stability;
3. The back layer concrete material plays a role of protecting the surface layer, is suitable for filling sand materials with small thermal expansion and cold contraction deformation in principle, and is suitable for casting moulds with large structures, and waste slag, waste refractory bricks, waste water glass casting sand and lost foam casting filling dry sand which is reused for a long time are preferably fully utilized, so that waste resources are fully utilized, and the crack resistance and the deformation resistance of the back layer concrete material are far superior to those of the cheapest quartz raw sand;
4. Good compounding of cast face and backing layers: according to the invention, 15-25% of ordinary cement is added to the surface layer of the casting material, 20-30% of ordinary cement is added to the back layer, so that the difference of the cement content of the surface layer and the back layer is reduced, the self-hardening property of the surface layer is close, the surface layer and the back layer are fused into a whole, and the interface separation phenomenon of the surface layer and the back layer is avoided;
5. Compared with the methods of wax investment casting, vanishing imitation investment casting brush coating gasifying empty shell and the like, the method has the advantages of simplified working procedures, improved work efficiency and operation reliability, environmental protection, less environmental protection and no pollution, and breaks through the limitation that the gasifying empty shell method of coating multi-layer coating on wax investment casting and vanishing EPS patterns can only be suitable for producing small castings.
Drawings
FIG. 1 is a schematic view showing how an EPS pattern of a lost foam casting is placed in a flask in the embodiment.
In the figure, an EPS pattern 2, a surface layer aggregate 3, a back layer aggregate 4, a sand box 5, a pouring gate 6, a riser 7 and a hanging hook.
Detailed Description
The technical solutions of the present invention will be fully described below with reference to the accompanying drawings and examples, and it is apparent that the described examples are only some, but not all, examples of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
As shown in fig. 1, a method for self-collapsing a high-strength lost foam cavity carbonless casting mold along with casting cooling comprises the following steps:
S1, preparing and coating a fluid or wet coagulation material:
in order to obtain the casting mold with high strength, high air permeability and smooth inner cavity wall surface, the aggregate is divided into a surface layer material and a back layer material, which are respectively prepared by different components:
s1-1, preparing a surface layer fluid state aggregate, wherein the components in percentage by weight are as follows:
sieving 20% of common cement, 76% of kyanite, 1% of polyacrylamide, 1% of plant powder and 2% of alpha starch with a 200-mesh sieve, mixing, adding water accounting for 65% of the total weight of 5 materials, and stirring for 20min to form a fluid or toothpaste-like aggregate;
s1-2, preparing a backing layer wet state aggregate, wherein the backing layer wet state aggregate comprises the following components in percentage by weight:
25% of ordinary cement, 74% of 20-100 mesh filling sand material and 1% of plant powder, wherein the granularity of the plant powder is 0.5-3 mm, and after mixing, water accounting for 20% of the total weight of the 3 materials is added and stirred for 10min to form wet coagulation material;
The filling sand material is one or more of waste slag particles, waste refractory brick particles, waste water glass casting sand and reused lost foam casting filling dry sand;
s2, EPS pattern and aggregate composite modeling:
brushing or scraping the surface layer aggregate 2 on the surface of the EPS pattern 1 to a thickness of about 4mm, and transferring to the following working procedure when the wet state is free from creep:
Placing the EPS pattern 1 attached with the surface layer concrete 2 in a sand box 4 to fill the backing layer concrete 3 for molding, placing the sand box 4 on a flat plate by using a movable detachable or fixed iron structure, filling a layer of backing layer concrete with the thickness of 4-5 cm on the bottom surface in the sand box, and placing the EPS pattern 1 on a backing layer concrete cushion layer to fill the wet and fluid backing layer concrete sand box for composite molding; one end of the EPS pattern 1 is communicated with the pouring gate 5, and the other end is communicated with the riser 7;
s3, initial setting of casting mold:
after the composite molding process is finished, the composite molding process is placed at normal pressure for more than 6 hours for natural solidification, a solid mold with better strength is formed, and the composite molding process is placed at normal temperature for more than 24 hours;
S4, drying the casting mould and gasifying an EPS pattern to form a carbon-free cavity:
Placing the solid mold in a gasification furnace with controllable temperature of 600-650 ℃, quickly gasifying and pyrolyzing an EPS pattern, obtaining a cavity mold after full gasification, discharging and pouring molten metal, wherein the time required by gasification in the furnace is changed according to factors such as EPS pattern density, structure, temperature condition in the furnace, capacity of the mold and the like, and is generally more than 30 minutes;
S5, pouring molten metal:
And after the cavity casting mold is taken out of the furnace, the cavity casting mold is hung to a casting pit paved with dry sand through a hanging hook 7, and molten metal is cast according to the production convention, so that a high-grade precise high-quality casting without carbon defects is obtained.
The preferred embodiments of the invention disclosed above are merely to aid in the description of the invention and are not intended to limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention.
Claims (4)
1. The method for automatically collapsing the high-strength lost foam cavity carbonless casting mold along with the cooling of the casting is characterized by comprising the following steps of:
S1, preparing and coating a fluid state and wet state aggregate:
The aggregate is divided into a surface layer material and a back layer material, which are respectively prepared by different components:
s1-1, preparing a surface layer fluid state aggregate, wherein the components in percentage by weight are as follows:
15-25% of ordinary cement, 71-81% of kyanite, 1% of polyacrylamide, 1% of plant powder and 2% of alpha starch, sieving the raw materials with a 150-200 mesh sieve, mixing, adding water accounting for 50-80% of the total weight ratio of the five raw materials, and stirring for 15-25 min to form a fluidized aggregate;
s1-2, preparing a backing layer wet state aggregate, wherein the backing layer wet state aggregate comprises the following components in percentage by weight:
20-30% of ordinary cement, 69-79% of 20-100 mesh filling sand material and 1% of plant powder, wherein the granularity of the plant powder is 0.5-3 mm, and after mixing, water accounting for 15-25% of the total weight ratio of the three raw materials is added, and stirring is carried out for 8-12 min to form wet coagulation material;
S1-2, the filling sand material is one or more of waste slag, waste refractory bricks, waste water glass casting sand and reused lost foam casting filling dry sand;
s2, EPS pattern and aggregate composite modeling:
Brushing or scraping the surface layer coagulation material on the surface of the EPS pattern, and transferring the thickness of the surface layer coagulation material to the next procedure when the surface layer coagulation material has no creep in a wet state of 3-4 mm:
Placing the EPS model attached with the surface layer concrete material into a sand box to fill the back layer concrete material for modeling;
s3, initial setting of casting mold:
after the composite molding process is finished, the composite molding process is placed at normal temperature for more than 6 hours for natural solidification, a solid mold with better strength is formed, and the composite molding process is placed at normal temperature for more than 24 hours;
S4, drying the casting mould and gasifying an EPS pattern to form a carbon-free cavity:
placing the solid mould in a gasification furnace with controllable temperature of 600-650 ℃, quickly gasifying and pyrolyzing an EPS pattern, and obtaining a cavity mould after full gasification;
S4, gasifying in the furnace for more than 30 min;
S5, pouring molten metal:
Pouring molten metal after the cavity casting mold is taken out of the furnace to obtain a casting.
2. The method for self-collapsing the high-strength lost foam cavity carbonless casting mold with casting cooling according to claim 1, wherein in S2, the sand box is placed on a flat plate during molding, a layer of backing layer concrete with the thickness of 4-5 cm is filled on the inner bottom surface of the sand box, and then the EPS pattern is placed on the backing layer concrete cushion layer to fill the wet backing layer concrete sand box for composite molding.
3. The method for self-collapsing the high-strength lost foam cavity carbonless casting mold with casting cooling according to claim 1, wherein in S1-1, the surface layer fluid state aggregate is prepared, and the components are as follows by weight percent:
20% of ordinary cement, 76% of kyanite, 1% of polyacrylamide, 1% of plant powder and 2% of alpha starch.
4. The method for self-collapsing the high-strength lost foam cavity carbonless casting mold with casting cooling according to claim 1, wherein in S1-2, the backing layer wet state aggregate is prepared, and the components are as follows by weight percent:
25% of ordinary cement, 74% of 20-100 mesh filling sand material and 1% of plant powder.
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| CN202111384129.3A CN114042858B (en) | 2021-11-19 | 2021-11-19 | Method for self-collapsing high-strength lost foam cavity carbonless casting mold along with casting cooling |
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