CN116532614A - Mold core for precision casting and preparation method thereof - Google Patents
Mold core for precision casting and preparation method thereof Download PDFInfo
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- CN116532614A CN116532614A CN202310386791.5A CN202310386791A CN116532614A CN 116532614 A CN116532614 A CN 116532614A CN 202310386791 A CN202310386791 A CN 202310386791A CN 116532614 A CN116532614 A CN 116532614A
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- 238000005495 investment casting Methods 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 29
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000945 filler Substances 0.000 claims abstract description 26
- 239000000701 coagulant Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 239000006004 Quartz sand Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 229910052845 zircon Inorganic materials 0.000 claims description 14
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 14
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 claims description 10
- 235000011092 calcium acetate Nutrition 0.000 claims description 10
- 239000001639 calcium acetate Substances 0.000 claims description 10
- 229960005147 calcium acetate Drugs 0.000 claims description 10
- OPSXJNAGCGVGOG-DKWTVANSSA-L Calcium L-aspartate Chemical compound [Ca+2].[O-]C(=O)[C@@H](N)CC([O-])=O OPSXJNAGCGVGOG-DKWTVANSSA-L 0.000 claims description 7
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052863 mullite Inorganic materials 0.000 claims description 6
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 5
- 229940034055 calcium aspartate Drugs 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- 235000011010 calcium phosphates Nutrition 0.000 claims description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229960005069 calcium Drugs 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 235000001465 calcium Nutrition 0.000 claims description 2
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 claims description 2
- MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical compound [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 claims description 2
- 239000001527 calcium lactate Substances 0.000 claims description 2
- 229960002401 calcium lactate Drugs 0.000 claims description 2
- 235000011086 calcium lactate Nutrition 0.000 claims description 2
- 229960001714 calcium phosphate Drugs 0.000 claims description 2
- 235000019691 monocalcium phosphate Nutrition 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 46
- 239000011162 core material Substances 0.000 description 64
- 230000000052 comparative effect Effects 0.000 description 16
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 9
- 235000019353 potassium silicate Nutrition 0.000 description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 9
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 239000000378 calcium silicate Substances 0.000 description 7
- 229910052918 calcium silicate Inorganic materials 0.000 description 7
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 5
- -1 Polyoxyethylene Polymers 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 150000002191 fatty alcohols Chemical class 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- 239000000080 wetting agent Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000002518 antifoaming agent Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application casting technical field specifically discloses a core for precision casting and a preparation method thereof. The core for precision casting consists of the following raw materials in parts by weight: 100 parts of silica sol, 4-8 parts of coagulant containing free calcium ions and 400-550 parts of refractory filler; the preparation method of the core for precision casting comprises the following steps: uniformly mixing silica sol and refractory filler to prepare a mixture; adding the coagulant containing free calcium ions into the mixture, and uniformly stirring to obtain slurry; and pouring the slurry into a wax mould, and hardening and forming to obtain the core for precision casting. The core for precision casting, which is manufactured by the method, can solve the problem that pollution can be generated during core manufacturing.
Description
Technical Field
The application relates to the technical field of casting, in particular to a core for precision casting and a preparation method thereof.
Background
Precision casting is an excellent technique in the casting industry, and can produce castings with complex structures. The casting cast by the casting machine has high dimensional accuracy and good surface quality. The precision casting has wide application range and has unique advantages in the aspect of manufacturing high-end castings.
For a long time, a wax pattern is manufactured by adopting a mould, and sand spraying and hardening are performed while coating the outside of the wax pattern layer by layer to manufacture the mould shell. And then the wax mould is removed, the mould shell is roasted, and molten steel is poured into the mould shell to prepare the casting. However, for castings with relatively complex cavities, it is also necessary to form the cores in wax molds, the raw materials of which typically include binders and refractory fillers.
In the related art, water glass is generally used as a binder in a core raw material, however, a chlorine salt is required to be used in the hardening process, which generates a large amount of acid mist of hydrogen chloride, and the acid mist of hydrogen chloride causes environmental pollution.
Therefore, there is a need to develop a mold core for precision casting that meets the environmental requirements.
Disclosure of Invention
In order to solve the problem of environmental pollution during core manufacture, the application provides a core for precision casting.
In a first aspect, the present application provides a core for precision casting, which adopts the following technical scheme:
a core for precision casting, which is composed of the following raw materials in parts by weight: 100 parts of silica sol, 4-8 parts of coagulant containing free calcium ions and 400-550 parts of refractory filler.
By adopting the technical scheme, the silica sol is adopted as the binder, silicate in the silica sol can adsorb calcium ions in the coagulant containing free calcium ions and combine with the calcium ions to generate calcium silicate gel, the refractory filler is bonded together, the coagulant containing free calcium ions promotes the hardening of the silica sol, and the hardening time is reduced; compared with the traditional binder water glass, on one hand, the application does not need to add chloride as a hardener, does not generate a large amount of acid mist of hydrogen chloride, and meets the requirement of environmental protection; on the other hand, the strength of the calcium silicate gel generated by the silica sol and the coagulant containing free calcium ions is higher, so that the core with excellent mechanical property can be prepared, and the problem of pollution during manufacturing the core is solved.
Preferably, the weight part of the coagulant containing free calcium ions is 5-7 parts.
By adopting the technical scheme, when the weight part of the accelerator containing free calcium ions is 5-7 parts, the mass ratio of the accelerator to the silica sol is moderate, the hardening speed of the silica sol is moderate, and the core with uniform thickness and higher precision is generated in a relatively short time.
Preferably, the coagulant containing free calcium ions is one or more of calcium acetate, calcium phosphate, calcium superphosphate, calcium hydrophosphate, calcium lactate and calcium L-aspartate.
Preferably, the coagulant containing free calcium ions is calcium acetate and/or calcium L-aspartate.
By adopting the technical scheme, the calcium acetate and the L-calcium aspartate are synergistic in promoting the silica sol to generate gel, and the strength of the calcium silicate gel is improved together by the cooperation of the calcium acetate and the L-calcium aspartate.
Preferably, the refractory filler is one or more of quartz sand, mullite, zircon powder and white corundum powder.
Preferably, the refractory filler is quartz sand and/or zircon powder.
By adopting the technical scheme, the main components of the quartz sand and the zircon powder do not contain alumina, and after the casting is obtained by casting molding through the core, the sand cleaning process for the surface of the casting is simpler. The quartz sand and the zircon powder are synergistic in reducing the sand cleaning difficulty of the casting surface.
In a second aspect, the present application provides a method for preparing a core for precision casting, which adopts the following technical scheme:
the preparation method of the core for precision casting comprises the following steps:
uniformly mixing the silica sol and the refractory filler to prepare a mixture;
adding the coagulant containing free calcium ions into the mixture, and uniformly stirring to obtain slurry;
and pouring the slurry into a wax mould, and hardening and forming to obtain the core for precision casting.
Preferably, the temperature in the hardening and shaping step is 28-38 ℃.
By adopting the technical scheme, when the temperature in the hardening and forming step is 28-38 ℃, the temperature is moderate, the hardening speed of silica sol is moderate, the hardness of the wax mould at the temperature is higher, the shape is not easy to deform, and finally the precision of the prepared core and casting is higher.
In summary, the present application has the following beneficial effects:
1. the application adopts silica sol to replace the traditional binder water glass, and the silica sol reacts with the coagulant containing free calcium ions to generate calcium silicate gel, so that the refractory filler is bonded together. Compared with the traditional binder water glass, the method has the advantages that on one hand, chloride is not needed to be added as a hardener, and the environment-friendly requirement is met; on the other hand, the strength of the calcium silicate gel is higher, so that the core with excellent mechanical property can be prepared, and the problem that pollution is generated during manufacturing of the core is solved.
2. In the application, 5-7 parts by weight of the accelerator containing free calcium ions is preferably added, and when the accelerator is mixed with the silica sol according to the parts by weight, the mass ratio of the accelerator to the silica sol is moderate, the hardening speed of the silica sol is moderate, and the core with uniform thickness and high precision is generated in a relatively short time.
3. According to the method, quartz sand and/or zircon powder are preferably used as refractory fillers, the main components of the quartz sand and the zircon powder do not contain alumina, and after a casting is obtained by casting molding through a core, sand cleaning is carried out on the surface of the casting.
Detailed Description
Currently, in the precision casting industry, when making castings with relatively complex cavities, cores are required to be made inside the wax pattern, the core materials typically including binders and refractory fillers. The binder is mostly water glass, and chloride is needed in the hardening process, so that a large amount of acid mist of hydrogen chloride is generated, and serious pollution is caused to the environment;
in addition, the refractory filler used in the core raw material generally contains alumina, and it is difficult to clean the surface of the casting later, which results in a decrease in quality of the casting and a decrease in yield.
Based on the above situation, the applicant has conducted a great deal of research on the preparation process of the core and the formulation of the raw materials, so as to find a preparation method of the core, which has the advantages of simple process, convenient sand cleaning and environment protection. Through extensive research and experiments, the applicant has found that the above problems can be solved by using silica sol instead of water glass as an adhesive, using a coagulant containing free calcium ions instead of chloride salt, and using quartz sand and zircon powder as refractory filler.
The silicate radical in the silica sol reacts with calcium ions in the coagulant containing free calcium ions to generate calcium silicate gel with higher strength; the hardening treatment by adding chloride salt in the later stage is not needed, the environment is not polluted, and the environment protection requirement is met; when the quartz sand and the zircon powder are used as refractory fillers, because the main components of the quartz sand and the zircon powder do not contain alumina, after a casting is obtained by using a core casting molding, sand cleaning is simpler on the surface of the casting. Through a large amount of researches and experiments of the applicant, the mold core for precision casting, which is simple in process, simple in sand removal and meets the environmental protection requirement, is finally prepared, so that the technical problem of the application is solved.
The present application is described in further detail below with reference to examples.
The raw material specifications used in the following examples and comparative examples are detailed in Table 1 unless otherwise specified.
TABLE 1 raw materials specification information
| Raw materials | Specification of specification |
| Silica sol | Cargo number: 483493 |
| Quartz sand | 20-40 mesh |
| Polyoxyethylene fatty alcohol ether | Model: AEO-3 |
| Mullite | 20-40 mesh |
| Zircon powder | 20-40 mesh |
Examples
Example 1
A mold core for precision casting comprises the following components:
100kg of silica sol, 4kg of coagulant calcium acetate containing free calcium ions, 400kg of fire-resistant filler quartz sand, 150g of wetting agent polyoxyethylene fatty alcohol ether and 150g of defoamer n-octanol;
the core for precision casting is prepared according to the following steps:
uniformly mixing silica sol, refractory filler, polyoxyethylene fatty alcohol ether serving as a wetting agent and n-octanol serving as a defoaming agent to prepare a mixture;
adding the coagulant containing free calcium ions into the mixture, and uniformly stirring to obtain slurry;
and (3) pouring the slurry into a wax mould at 28 ℃, and hardening and forming to obtain the core for precision casting, wherein the hardening and forming process is kept at 28 ℃ all the time.
Examples 2 to 5
The core for precision casting is different from example 1 in that: the core for precision casting was different in the raw material composition, and the specific composition is shown in the following table 2:
TABLE 2 raw material composition of core for precision casting
Example 6
The core for precision casting is different from example 1 in that: the choice of accelerator containing free calcium ions was varied, and calcium L-aspartate was chosen in this example.
Example 7
The core for precision casting is different from example 1 in that: the accelerator containing free calcium ions was chosen differently, in this example 2kg of calcium acetate and 2kg of calcium L-aspartate were chosen.
Example 8
The core for precision casting is different from example 1 in that: the free calcium ion-containing accelerator was chosen differently, and calcium phosphate was chosen in this example.
Example 9
The core for precision casting is different from example 1 in that: the refractory filler is selected differently, and mullite is selected in this example.
Example 10
The core for precision casting is different from example 1 in that: the choice of refractory filler is different, and zircon powder is chosen in this example.
Example 11
The core for precision casting is different from example 1 in that: the refractory filler was selected differently, and in this example 200kg of quartz sand and 200kg of zircon powder were selected.
Example 12
The core for precision casting is different from example 1 in that: the temperatures in the coating and hardening process are different, in this case 38 ℃.
Example 13
The core for precision casting is different from example 1 in that: the temperatures in the coating and hardening process are different, in this case 26 ℃.
Example 14
The core for precision casting is different from example 1 in that: the temperatures in the coating and hardening process are different, in this case 45 ℃.
Comparative example
Comparative examples 1 to 2
The core for precision casting is different from example 1 in that: the core for precision casting was different in the raw material composition, and the specific composition is shown in the following table 3:
TABLE 3 raw material composition of core for precision casting
Comparative example 3
A mold core for precision casting comprises the following components:
100kg of water glass, 4kg of ammonium chloride, 400kg of fire-resistant filler quartz sand, 150g of wetting agent polyoxyethylene fatty alcohol ether and 150g of defoaming agent n-octanol;
the core for precision casting is prepared according to the following steps:
uniformly mixing water glass, refractory filler, polyoxyethylene fatty alcohol ether serving as a wetting agent and n-octanol serving as a defoaming agent to prepare a mixture;
adding ammonium chloride into the mixture, and uniformly stirring to obtain slurry;
and (3) pouring the slurry into a wax mould at 28 ℃, and hardening and forming to obtain the core for precision casting, wherein the hardening and forming process is kept at 28 ℃ all the time.
Application examples and application comparative examples
A casting is prepared according to the following steps:
coating shell raw materials on a wax mould on the surface of a core, hardening, preparing a shell on the surface of the wax mould, forming a core, the wax mould and the shell into a three-layer structure, removing the wax mould, storing a cavity between the core and the shell, preheating the core and the shell, smelting alloy materials, pouring the smelted alloy materials into the cavity, cooling, removing the core and the shell, cleaning and polishing to obtain the casting.
Cores were prepared from examples and comparative examples, respectively, with specific sources as shown in table 4 below:
TABLE 4 Source of cores for precision casting
Detection method
According to GB/T39638-2020 casting X-ray digital imaging detection, nondestructive inspection is carried out on castings prepared in application examples 1-14 and application comparative examples 1-3, 100 castings are selected for each application example to be detected, the qualification rate of the castings is calculated according to a formula 1, the quality of the castings and cores for precision casting is characterized, and specific detection results are shown in the following table 5.
Yield = number of accepted castings/100 (1)
Detection result
TABLE 5 performance test of castings
| Project | Yield (%) | Project | Yield (%) |
| Application example 1 | 94 | Application example 10 | 95 |
| Application example 2 | 93 | Application example 11 | 97 |
| Application example 3 | 95 | Application example 12 | 95 |
| Application example 4 | 95 | Application example 13 | 91 |
| Application example 5 | 96 | Application example 14 | 90 |
| Application example 6 | 95 | Comparative example 1 was used | 72 |
| Application example 7 | 97 | Comparative example 2 was used | 65 |
| Application example 8 | 93 | Comparative example 3 was used | 78 |
| Application example 9 | 92 |
As can be seen from Table 5, the casting qualification rate of the casting prepared by the application example of the present application is not less than 90%, and the casting qualification rate is higher, which indicates that the quality of the core for precision casting prepared by the application example of the present application is higher.
As can be seen in connection with application example 1 and application comparative example 2 and in connection with table 5, the yield of castings produced in application example 1 was 94% much greater than in application comparative example 2, probably because: in comparative example 2, the accelerator mass in the core stock was higher than 8kg, which may result in a silica sol hardening rate that is too high, resulting in a lower precision core, and thus a lower quality cast, and a lower yield.
As can be seen in connection with application example 1 and application comparative example 3 and in connection with table 5, the yield of castings produced in application example 1 was 94% much greater than in application comparative example 3, probably because: in comparative example 3, water glass was used as a binder instead of silica sol, and the produced cores were inferior in quality and dimensional accuracy, resulting in poor quality castings and low yield.
As can be seen from the combination of application examples 1 and application examples 6 to 7 and the combination of table 5, the yield of the castings produced in application example 7 was 97% greater than that in application examples 1 and 6, which indicates that: the coagulant containing free calcium ions selected in example 7 is 2kg of calcium acetate and 2kg of calcium L-aspartate, and the calcium acetate and the calcium L-aspartate are synergistic in promoting silica sol to generate gel, and the two are matched to jointly improve the strength of calcium silicate gel, so that the quality of the core and the casting is improved.
As can be seen by combining application example 1 and application example 9 and combining table 5, the yield of castings produced by application example 1 was 94% greater than application example 9, which indicates that: the refractory filler selected in example 9 is mullite, alumina is contained in the mullite, and the casting prepared by using the core in example 9 has difficult surface sand removal, so that the qualification rate of the casting is reduced.
As can be seen in combination with application example 1 and application examples 12 to 14 and with table 5, the casting yield of application example 1 and application example 12 was higher than that of application examples 13 to 14, which indicates that: in examples 13 and 14, the temperatures in the coating and hardening crust-making steps were 26℃and 45℃respectively. The temperatures in the examples 1 and 12 are in the range of 28-38 ℃, the temperatures are moderate, the hardening speed of the silica sol is moderate, the hardness of the wax mould is high, the shape is not easy to deform, the precision of the finally prepared core and casting is high, and the rate of the casting is high.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (8)
1. A core for precision casting, characterized in that: the mold core is composed of the following raw materials in parts by weight: 100 parts of silica sol, 4-8 parts of coagulant containing free calcium ions and 400-550 parts of refractory filler.
2. A core for precision casting according to claim 1, characterized in that: the weight part of the coagulant containing free calcium ions is 5-7 parts.
3. A core for precision casting according to claim 1, characterized in that: the coagulant containing free calcium ions is one or more of calcium acetate, calcium phosphate, calcium superphosphate, calcium hydrophosphate, calcium lactate and L-calcium aspartate.
4. A core for precision casting according to claim 3, characterized in that: the coagulant containing free calcium ions is calcium acetate and/or calcium L-aspartate.
5. A core for precision casting according to claim 1, characterized in that: the refractory filler is one or more of quartz sand, mullite and zircon powder.
6. A precision casting core as defined in claim 5, wherein: the refractory filler is quartz sand and/or zircon powder.
7. A method for producing a core for precision casting according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
uniformly mixing the silica sol and the refractory filler to prepare a mixture;
adding the coagulant containing free calcium ions into the mixture, and uniformly stirring to obtain slurry;
and pouring the slurry into a wax mould, and hardening and forming to obtain the core for precision casting.
8. The method for producing a core for precision casting according to claim 7, characterized in that: the temperature in the hardening and forming step is 28-38 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310386791.5A CN116532614B (en) | 2023-04-12 | 2023-04-12 | Mold core for precision casting and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310386791.5A CN116532614B (en) | 2023-04-12 | 2023-04-12 | Mold core for precision casting and preparation method thereof |
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| CN116532614A true CN116532614A (en) | 2023-08-04 |
| CN116532614B CN116532614B (en) | 2024-04-05 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110342914A (en) * | 2019-07-03 | 2019-10-18 | 金永和精工制造股份有限公司 | A kind of ceramic core and preparation method |
| CN113020544A (en) * | 2021-03-08 | 2021-06-25 | 洛阳航辉新材料有限公司 | Preparation method of ceramic core for titanium alloy cast characters |
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| US4093017A (en) * | 1975-12-29 | 1978-06-06 | Sherwood Refractories, Inc. | Cores for investment casting process |
| CN1827256A (en) * | 2006-04-14 | 2006-09-06 | 清华大学 | Method for direct production of core in narrow groove and blind hole of wax mould |
| CN103958432A (en) * | 2011-12-23 | 2014-07-30 | Sika技术股份公司 | Accelerator |
| CN103396126A (en) * | 2013-07-16 | 2013-11-20 | 安徽瑞泰新材料科技有限公司 | Refractory castable and using method thereof |
| CN109732036A (en) * | 2019-02-28 | 2019-05-10 | 上海万泽精密铸造有限公司 | Moltening mold castings fill core material and preparation method |
| CN110342914A (en) * | 2019-07-03 | 2019-10-18 | 金永和精工制造股份有限公司 | A kind of ceramic core and preparation method |
| CN113020544A (en) * | 2021-03-08 | 2021-06-25 | 洛阳航辉新材料有限公司 | Preparation method of ceramic core for titanium alloy cast characters |
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