CN116393655A - Instant mold core and preparation method thereof - Google Patents
Instant mold core and preparation method thereof Download PDFInfo
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- CN116393655A CN116393655A CN202310662073.6A CN202310662073A CN116393655A CN 116393655 A CN116393655 A CN 116393655A CN 202310662073 A CN202310662073 A CN 202310662073A CN 116393655 A CN116393655 A CN 116393655A
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- instant
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- polyethylene glycol
- talcum powder
- wax
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 54
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 31
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 30
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 27
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 27
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 15
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 15
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 239000012943 hotmelt Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000009966 trimming Methods 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 4
- 229920001030 Polyethylene Glycol 4000 Polymers 0.000 claims description 4
- 241000572533 Bombycillidae Species 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims 2
- 235000012222 talc Nutrition 0.000 claims 2
- 239000000454 talc Substances 0.000 claims 2
- 238000005495 investment casting Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000005266 casting Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000001746 injection moulding Methods 0.000 abstract description 7
- 238000004090 dissolution Methods 0.000 abstract description 6
- 238000011049 filling Methods 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 44
- 239000002994 raw material Substances 0.000 description 21
- 239000000126 substance Substances 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000012847 fine chemical Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012738 dissolution medium Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to an instant mold core and a preparation method thereof, and belongs to the technical field of precision casting. The instant core comprises the following components in percentage by weight: 37-44wt% of baking soda, 28-35wt% of polyethylene glycol, 15-20wt% of talcum powder and 8-13wt% of citric acid; through reasonable proportion, the mold has good fluidity and mold filling capability after hot melting, is suitable for the manufacture of complex inner cavities, has stable mold filling and good mechanical property of the mold core, can meet the requirements of most wax injection molding shells on the market, greatly accelerates the dissolution rate of the mold core in water after compounding citric acid, has no pollution to the environment, and can greatly reduce the pollution source of the traditional casting industry.
Description
Technical Field
The invention belongs to the technical field of precision casting production, and particularly relates to an instant mold core and a preparation method thereof.
Background
The lost wax precision casting is now called investment precision casting, is a precision casting process with little or no cutting, is an excellent process technology in the precision casting industry, and has very wide application. The casting method is not only suitable for precision casting of various types and various alloys, but also can produce castings with dimensional accuracy and surface quality higher than those of other precision casting methods, even complex castings which are difficult to cast by other precision casting methods, high temperature resistant and difficult to process, and can be cast by investment precision casting.
At present, two main types of cores for complex cavity structures are adopted, namely urea casting is adopted, urea is heated to 110 ℃, urea begins to melt, and melted liquid is poured into a mold cavity for casting; the core prepared by the method has the following defects: a. when urea is melted, a large amount of ammonia gas is released to pollute the environment, and splash burn skin is easy to generate; b. the molding technology does not adopt a wax injection machine, only adopts gravity casting, and the surface of the product can generate the defects of under casting, meat deficiency, poor surface finish and the like; c. a large amount of gas is generated in the cooling process of the poured liquid, and the air holes on the surface of the product are serious; d. the operation is complex, the efficiency is extremely low, and the method is not suitable for mass production. Secondly, polyethylene glycol, sodium bicarbonate, talcum powder and glass fiber are adopted for heating and stirring to prepare water-soluble wax, a wax injection machine is adopted for injection molding, the prepared wax mould has the advantages of flat and smooth surface, no air holes, no defects and the like, however, the core has a slow dissolution speed and a long preparation period, mass production cannot be satisfied, hydrochloric acid is generally required to be used for soaking in mass production, and the dissolved hydrochloric acid aqueous solution is harmful to the environment and causes serious pollution to water and soil. Accordingly, the present invention is directed to a core material having a high rate of water dissolution.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the invention provides an instant mold core and a preparation method thereof.
The aim of the invention can be achieved by the following technical scheme:
an instant core comprising, in weight percent:
37-44wt% of baking soda, 28-35wt% of polyethylene glycol, 15-20wt% of talcum powder and 8-13wt% of citric acid.
As a preferred embodiment of the invention, the instant cores comprise the following components: 40wt% of baking soda, 33wt% of polyethylene glycol, 17wt% of talcum powder and 10wt% of citric acid.
As a preferred scheme of the invention, the talcum powder is prepared by grading talcum powder with fineness of 1500 meshes, 2000 meshes and 6000 meshes.
As a preferred embodiment of the present invention, the polyethylene glycol is selected from one of PEG-4000 and PEG-5000.
The preparation method of the instant mold core specifically comprises the following steps:
step S1: adding sodium bicarbonate and polyethylene glycol, heating, stirring, melting and mixing, sequentially adding talcum powder and citric acid, and mixing to obtain hot melt;
step S2: injecting the hot melt into a mold cavity through a wax injection machine for cooling and solidifying to obtain a core blank;
step S3: trimming the core blank, and removing flash and wax wings to obtain the instant core.
As a preferred embodiment of the present invention, the melt mixing temperature of the hot melt is 70-80 ℃.
As a preferable scheme of the invention, the wax injection temperature of the hot melt is 60-65 ℃, the wax injection pressure is 2.5-3.0MPa, and the wax injection time is 40-45s.
The invention has the beneficial effects that:
polyethylene glycol with good water solubility is used as an adhesive material, and good fluidity and filling capacity of the hot melt are ensured through reasonable dosage proportion and shape selection, so that the method is suitable for manufacturing of complex inner cavities; talcum powder is used as a filler, has good suspension property and easy dispersibility, ensures the filling stability and mechanical property of hot melt materials through grading use, and can meet the requirements of most wax injection shell making in the market; most importantly, long-term experimental researches show that the citric acid with the weight of 8-13wt% is compounded in the formula, so that the dissolution rate of the core in water can be greatly accelerated, the citric acid has no pollution to the environment, and the pollution source of the traditional casting industry can be greatly reduced.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
Example 1
The instant core with the complex cavity structure in the embodiment specifically comprises the following steps:
1. metering raw materials:
sodium bicarbonate accounting for 37 weight percent, the dosage is 111kg, and commercial industrial grade raw materials are provided by Jiangsu certain chemical industry Co., ltd;
polyethylene glycol, the model is PEG-4000, the weight ratio is 35 percent, the dosage is 105kg, and the polyethylene glycol is purchased in a petrochemical plant in Jiangsu province;
talcum powder, which is prepared from 1500 mesh talcum powder, 2000 mesh talcum powder and 6000 mesh talcum powder according to the weight ratio of 3:1:1, wherein the total weight ratio is 20wt%, and the dosage is 60kg, which is provided by Guangzhou chemical industry Co., ltd;
citric acid, 8wt%, in an amount of 24kg, is commercially available as an industrial grade raw material, and is provided by certain fine chemical industry Co., ltd.
2. Raw material hot melting
Adding the above metering raw materials into a stirring kettle, adding sodium bicarbonate and polyethylene glycol, stirring at 60rpm, heating to 70deg.C, maintaining the temperature, stirring for 4 hr to completely melt polyethylene glycol, adding pulvis Talci, stirring and mixing for 3 hr, and adding citric acid and mixing for 3 hr to obtain hot melt.
3. Wax injection molding
And (3) transferring the hot melt into a wax injection machine, controlling the wax injection temperature to be 60 ℃, the wax injection pressure to be 2.5MPa, the wax injection time to be 40s, injecting the hot melt into a die cavity, cooling, solidifying and shaping, and demoulding to obtain a core blank.
4. Fine finishing
And (5) trimming excessive structures such as flash, wax fins and the like in the core blank to obtain the instant core.
Example 2
The instant core with the complex cavity structure in the embodiment specifically comprises the following steps:
1. metering raw materials:
sodium bicarbonate accounting for 44wt% and used in 132kg, which is commercially available industrial grade raw material provided by Jiangsu certain chemical industry Co., ltd;
polyethylene glycol, the model is PEG-4000, the weight ratio is 28wt%, the dosage is 84kg, and the polyethylene glycol is purchased from a petrochemical plant in Jiangsu province;
talcum powder, which is prepared from 1500 mesh talcum powder, 2000 mesh talcum powder and 6000 mesh talcum powder according to the weight ratio of 3:1:1, wherein the total weight ratio is 15wt%, and the dosage is 45kg, which is provided by Guangzhou chemical industry Co., ltd;
citric acid, 13wt%, was used in an amount of 39kg, commercially available as an industrial grade raw material, supplied by some fine chemical company, inc. of Wujiang.
2. Raw material hot melting
Adding the above metering raw materials into a stirring kettle, adding sodium bicarbonate and polyethylene glycol, stirring at 60rpm, heating to 70deg.C, maintaining the temperature, stirring for 4 hr to completely melt polyethylene glycol, adding pulvis Talci, stirring and mixing for 3 hr, and adding citric acid and mixing for 3 hr to obtain hot melt.
3. Wax injection molding
And (3) transferring the hot melt into a wax injection machine, controlling the wax injection temperature to 65 ℃, the wax injection pressure to 3.0MPa, the wax injection time to 45s, injecting the hot melt into a mold cavity, cooling, solidifying and shaping, and demolding to obtain a core blank.
4. Fine finishing
And (5) trimming excessive structures such as flash, wax fins and the like in the core blank to obtain the instant core.
Example 3
The instant core with the complex cavity structure in the embodiment specifically comprises the following steps:
1. metering raw materials:
sodium bicarbonate accounting for 40wt% and used in an amount of 120kg, which is commercially available industrial grade raw materials provided by Jiangsu certain chemical industry Co., ltd;
polyethylene glycol, the model is PEG-5000, the weight ratio is 33wt%, the dosage is 99kg, and the polyethylene glycol is purchased in a petrochemical plant in Jiangsu province;
talcum powder, which is prepared from 1500 mesh talcum powder, 2000 mesh talcum powder and 6000 mesh talcum powder according to the weight ratio of 3:1:1, the total weight ratio is 17wt percent, the dosage is 51kg, and the mixture is provided by Guangzhou chemical industry Co., ltd;
citric acid, 10wt%, in an amount of 30kg, is commercially available as an industrial grade raw material, and is provided by some fine chemical company of Wujiang.
2. Raw material hot melting
Adding the above metering raw materials into a stirring kettle, adding sodium bicarbonate and polyethylene glycol, stirring at 80rpm, heating to 80deg.C, maintaining the temperature, stirring for 5 hr to completely melt polyethylene glycol, adding pulvis Talci, stirring and mixing for 3 hr, and adding citric acid and mixing for 2 hr to obtain hot melt.
3. Wax injection molding
And (3) transferring the hot melt into a wax injection machine, controlling the wax injection temperature to 65 ℃, the wax injection pressure to 2.5MPa, the wax injection time to 45s, injecting the hot melt into a mold cavity, cooling, solidifying and shaping, and demolding to obtain a core blank.
4. Fine finishing
And (5) trimming excessive structures such as flash, wax fins and the like in the core blank to obtain the instant core.
Example 4
The instant core with the complex cavity structure in the embodiment specifically comprises the following steps:
1. metering raw materials:
the baking soda accounts for 41 weight percent, the dosage is 123kg, and commercial industrial grade raw materials are provided by Jiangsu certain chemical industry Co., ltd;
polyethylene glycol, the model is PEG-5000, the weight ratio is 30wt%, the dosage is 90kg, and the polyethylene glycol is purchased in a petrochemical plant in Jiangsu province;
talcum powder, which is prepared from 1500 mesh talcum powder, 2000 mesh talcum powder and 6000 mesh talcum powder according to the weight ratio of 3:1:1, wherein the total weight ratio is 18wt%, and the dosage is 54kg, which is provided by Guangzhou chemical industry Co., ltd;
citric acid, 11wt%, was used in an amount of 33kg, and was commercially available as an industrial grade raw material, supplied by some fine chemical Co., ltd.
2. Raw material hot melting
Adding the above metering raw materials into a stirring kettle, adding sodium bicarbonate and polyethylene glycol, stirring at 80rpm, heating to 80deg.C, maintaining the temperature, stirring for 5 hr to completely melt polyethylene glycol, adding pulvis Talci, stirring and mixing for 3 hr, and adding citric acid and mixing for 2 hr to obtain hot melt.
3. Wax injection molding
And (3) transferring the hot melt into a wax injection machine, controlling the wax injection temperature to 65 ℃, the wax injection pressure to 3.0MPa, the wax injection time to 40s, injecting the hot melt into a mold cavity, cooling, solidifying and shaping, and demolding to obtain a core blank.
4. Fine finishing
And (5) trimming excessive structures such as flash, wax fins and the like in the core blank to obtain the instant core.
Comparative example
The comparative example is selected from commercial water-soluble wax preparation cores, and the specific raw material is water-soluble wax SW63F, and the specific implementation process is that the water-soluble wax SW63F is placed in a heating kettle, heated to 85 ℃ and stirred until the water-soluble wax is completely melted, the wax injection temperature is controlled to be 70 ℃, the wax injection pressure is controlled to be 3.0MPa, the wax injection time is 60s, and the water-soluble wax SW63F is subjected to wax injection molding, so that the cores with the same specification as the examples are obtained.
Taking cores prepared in examples 1-4 and comparative examples, respectively taking pure water and 10% hydrochloric acid solution with mass fraction as dissolution media, setting standing dissolution and circulating water dissolution, observing and recording the complete collapse time of the cores, wherein specific test data are shown in table 1:
TABLE 1
As can be seen from the data in Table 1, the instant core prepared by the invention has a collapsibility time of 8 hours in still water, which is far lower than that of the comparative example, and the collapsibility time can be reduced to 5 hours under the circulating water condition, thus the instant core has excellent water-soluble collapsibility characteristics.
In order to detect the mechanical strength of the core prepared in the process of wax injection and shell making, the hot melt in the implementation process is injected into a die cavity with the diameter of 50mm and the height of 20mm according to the setting of the technological parameters of wax irradiation and is made into a sample after die opening, and compression test is carried out by referring to GB 1039-1992 standard, and specific test data are shown in Table 2:
TABLE 2
As can be seen from the data in Table 2, the compressive strength of the core prepared by the method is 4.9-5.3MPa, and the core can meet the requirements of most wax injection shell manufacturing.
Example 5
The feasibility of the core prepared by the method in the production process is verified, and the core is wax-molded into a shell, and the specific process is as follows:
the cores prepared in examples 1 to 4 were mounted in a mold and positioned, the wax injection temperature was controlled to 60 ℃, the wax injection pressure was controlled to 3.0MPa, the wax injection time was 40s, the dwell time was 90s, and the mold was released after cooling and dissolved in water until the cores were completely removed, to obtain a wax mold.
The characteristic dimensions of the wax patterns prepared above were measured, and the linear shrinkage was calculated, and specific test data are shown in table 3:
TABLE 3 Table 3
As can be seen from the data in Table 3, the wax pattern produced by the core prepared according to the present invention has a linear shrinkage of less than 0.05% and a high dimensional stability.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (7)
1. An instant insert characterized by comprising, in weight percent:
37-44wt% of baking soda, 28-35wt% of polyethylene glycol, 15-20wt% of talcum powder and 8-13wt% of citric acid.
2. An instant core according to claim 1, characterized in that the composition of the instant core comprises: 40wt% of baking soda, 33wt% of polyethylene glycol, 17wt% of talcum powder and 10wt% of citric acid.
3. An instant core according to claim 1, characterized in that the talc is prepared by grading talc having a fineness of 1500 mesh, 2000 mesh and 6000 mesh.
4. An instant core according to claim 1, characterized in that the polyethylene glycol is selected from one of PEG-4000 and PEG-5000.
5. A method of preparing an instant core according to claim 1, comprising the specific steps of:
step S1: adding sodium bicarbonate and polyethylene glycol, heating, stirring, melting and mixing, sequentially adding talcum powder and citric acid, and mixing to obtain hot melt;
step S2: injecting the hot melt into a mold cavity through a wax injection machine for cooling and solidifying to obtain a core blank;
step S3: trimming the core blank, and removing flash and wax wings to obtain the instant core.
6. A method of preparing an instant core according to claim 5, characterized in that the melt mixing temperature of the hot melt is 70-80 ℃.
7. A method of preparing an instant core according to claim 5, wherein the hot melt is injected at a temperature of 60-65 ℃, a pressure of 2.5-3.0MPa, and a time of 40-45s.
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| CN202310662073.6A CN116393655A (en) | 2023-06-06 | 2023-06-06 | Instant mold core and preparation method thereof |
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| CN202310662073.6A CN116393655A (en) | 2023-06-06 | 2023-06-06 | Instant mold core and preparation method thereof |
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