CN110814278A - Preparation method of precision casting modulated wax - Google Patents
Preparation method of precision casting modulated wax Download PDFInfo
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- CN110814278A CN110814278A CN201810914696.7A CN201810914696A CN110814278A CN 110814278 A CN110814278 A CN 110814278A CN 201810914696 A CN201810914696 A CN 201810914696A CN 110814278 A CN110814278 A CN 110814278A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
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Abstract
The invention belongs to the technical field of precision casting, and particularly relates to a preparation method of precision casting blended wax, which is characterized in that microcrystalline wax, candelilla wax, carnauba wax, ethylene-vinyl acetate copolymer and pure monomer resin are sequentially added according to steps to prepare the blended wax, so that the strength is high, and the blended wax is not easy to deform; the gray level is low, and the pollution to metal casting is reduced; the mold is easy to demould, and the wax mold is easy to melt and flow out of the shell during demoulding; in the precision casting process, the production efficiency can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of precision casting, and particularly relates to a preparation method of precision casting modulation wax.
Background
With the development of society, precision castings have been widely used in the aviation, weapon, and other industrial sectors, particularly in electronics, petroleum, chemical, transportation, light industry, textile, pharmaceutical, medical, pump, and valve components.
The mould material commonly used at present is two or three of paraffin, stearic acid and rosin for use in a matching way, has good plasticity and filling property, but the mould material has poor thermal stability, low strength, high ash content, unfixed demoulding time, generates a large amount of waste products, has low quality and high cost, seriously influences the improvement of casting quality, has small competitiveness in the international market of the produced casting, and cannot meet the requirements of the precision casting industry.
However, many investment casting enterprises in China want to produce castings for export, and the quality of the castings is required to be improved for export. Therefore, advanced investment casting equipment and high quality mold material are required in the production process.
Disclosure of Invention
The invention aims to solve the problems and provides a preparation method of precision casting prepared wax, and the prepared wax has good dimensional stability, high strength, low ash content and easy demoulding.
The invention is realized by adopting the following technical scheme:
the precision casting modulating wax comprises the following raw materials in parts by weight: 44-46 parts of microcrystalline wax, 2.5-3.5 parts of candelilla wax, 34-36 parts of carnauba wax, 3.5-4.5 parts of ethylene-vinyl acetate copolymer and 12-14 parts of pure monomer resin.
Further, the precision casting modulated wax comprises the following raw materials in parts by weight: 44 parts of microcrystalline wax, 2.5 parts of candelilla wax, 34 parts of carnauba wax, 3.5 parts of ethylene-vinyl acetate copolymer and 12 parts of pure monomer resin.
Further, the precision casting modulated wax comprises the following raw materials in parts by weight: 46 parts of microcrystalline wax, 3.5 parts of candelilla wax, 36 parts of carnauba wax, 4.5 parts of ethylene-vinyl acetate copolymer and 14 parts of pure monomer resin.
Further, the precision casting modulated wax comprises the following raw materials in parts by weight: 45 parts of microcrystalline wax, 3 parts of candelilla wax, 35 parts of carnauba wax, 4 parts of ethylene-vinyl acetate copolymer and 13 parts of pure monomer resin.
The invention also provides a method for preparing the precision casting preparation wax, which comprises the following steps:
(1) dividing carnauba wax into two parts, heating one part at 120 ℃, continuously stirring until the carnauba wax is melted, adding the other part of carnauba wax, continuously heating, and continuously stirring until the carnauba wax is melted to obtain melted carnauba wax A;
(2) continuously heating the molten carnauba wax A obtained in the step (1) at 100-120 ℃, adding candelilla wax, and continuously stirring until the candelilla wax is completely molten to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 110-120 ℃, adding an ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃, adding pure monomer resin, and continuously stirring until the pure monomer resin is completely melted to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 110-120 ℃, and continuously stirring;
(6) cooling the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring, adding microcrystalline wax at 90-100 ℃, and heating and stirring until the microcrystalline wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6), cooling to 80-90 ℃ and preparing into particles to obtain the precision casting blending wax.
Further, in the step (2), the step (3) and the step (4), the heating time is 1-2 minutes.
Further, the heating time in the step (5) and the heating time in the step (7) are both 3-4 hours.
Further, the heating time in the step (6) is 30-60 minutes.
The beneficial effects of the invention include:
1. the linear shrinkage rate and the sinking rate are low, so that the product has strong dimensional stability;
2. the penetration is within the range of 5-6 dmm, so that the product has high strength;
3. the gray level is low, so that the surface smoothness of the casting is good, the metal cannot be polluted, and the casting quality is high;
4. the softening point and the dropping point are in the ideal range, so that the die is easy to be removed in the casting process, and the production efficiency is higher.
Detailed Description
The technical solutions in the examples will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
Weighing the following components in parts by weight: 44 parts of microcrystalline wax, 2.5 parts of candelilla wax, 34 parts of carnauba wax, 3.5 parts of ethylene-vinyl acetate copolymer and 12 parts of pure monomer resin, and preparing the prepared wax according to the following steps:
(1) dividing carnauba wax into two parts, heating one part at 120 ℃, continuously stirring until the carnauba wax is melted, adding the other part of carnauba wax, continuously heating, and continuously stirring until the carnauba wax is melted to obtain melted carnauba wax A;
(2) continuously heating the molten carnauba wax A obtained in the step (1) at 100 ℃ for 1 minute, adding candelilla wax, and continuously stirring until the carnauba wax is completely molten to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 110 ℃ for 1 minute, adding ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃ for 1 minute, adding pure monomer resin, and continuously stirring until the pure monomer resin is completely molten to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 110 ℃, and continuously stirring for 3 hours;
(6) cooling the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 30 minutes, adding microcrystalline wax at 90 ℃, and heating and stirring until the microcrystalline wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6) for 3 hours, cooling to 80 ℃, and preparing into particles to obtain the precision casting blending wax.
Example 2
Weighing the following components in parts by weight: 46 parts of microcrystalline wax, 3.5 parts of candelilla wax, 36 parts of carnauba wax, 4.5 parts of ethylene-vinyl acetate copolymer and 14 parts of pure monomer resin, and preparing the prepared wax according to the following steps:
(1) dividing carnauba wax into two parts, heating one part at 120 ℃, continuously stirring until the carnauba wax is melted, adding the other part of carnauba wax, continuously heating, and continuously stirring until the carnauba wax is melted to obtain melted carnauba wax A;
(2) continuously heating the molten carnauba wax A obtained in the step (1) at 120 ℃ for 2 minutes, adding candelilla wax, and continuously stirring until the carnauba wax is completely molten to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 120 ℃ for 2 minutes, adding ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃ for 2 minutes, adding pure monomer resin, and continuously stirring until the pure monomer resin is completely molten to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 120 ℃, and continuously stirring for 4 hours;
(6) cooling the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 60 minutes, adding microcrystalline wax at 100 ℃, and heating and stirring until the microcrystalline wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6) for 4 hours, cooling to 90 ℃, and preparing into particles to obtain the precision casting blending wax.
Example 3
Weighing the following components in parts by weight: 45 parts of microcrystalline wax, 3 parts of candelilla wax, 35 parts of carnauba wax, 4 parts of ethylene-vinyl acetate copolymer and 13 parts of pure monomer resin, and preparing the prepared wax according to the following steps:
(1) dividing carnauba wax into two parts, heating one part at 120 ℃, continuously stirring until the carnauba wax is melted, adding the other part of carnauba wax, continuously heating, and continuously stirring until the carnauba wax is melted to obtain melted carnauba wax A;
(2) continuously heating the molten carnauba wax A obtained in the step (1) at 110 ℃ for 1.5 minutes, adding candelilla wax, and continuously stirring until the mixture is completely molten to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 115 ℃ for 1.5 minutes, adding ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃ for 1.5 minutes, adding pure monomer resin, and continuously stirring until the pure monomer resin is completely molten to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 115 ℃, and continuously stirring for 3.5 hours;
(6) cooling the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 45 minutes, adding microcrystalline wax at 95 ℃, and heating and stirring until the microcrystalline wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6) for 3-4 hours, cooling to 85 ℃, and preparing into particles to obtain the precision casting blending wax.
In this embodiment, the microcrystalline wax and the carnauba wax are mixed in the above-mentioned mass parts, which is helpful for improving the strength and stability of the casting wax, and further improving the precision and production efficiency of the casting.
Comparative example
The prepared waxes prepared in examples 1, 2 and 3 of the present invention were respectively used to measure various technical indexes, and three common prepared waxes were used to perform the above technical index measurements, and the obtained experimental data are shown in table 1:
table 1: detection results of the prepared wax and the common prepared wax in the embodiment of the invention
| Detecting items | Penetration/ddm | Softening point/. degree.C | Ash content | Shrinkage rate |
| Examples1 | 5.3 | 74 | 0.012 | 0.85 |
| Example 2 | 5.6 | 76 | 0.013 | 0.84 |
| Example 3 | 5.1 | 75 | 0.012 | 0.85 |
| Common mixed wax | 7.9 | 60 | 0.044 | 0.97 |
As can be seen from the detection results in Table 1, the cone penetration of the precision casting modulated wax manufactured according to the invention is always kept within the range of 5-6 dmm, so that the modulated wax has high strength; the softening point and the dropping point are kept within the range of 70-80 ℃, so that the easy demoulding in the casting process is ensured; the ash content is low, so that the surface smoothness of the casting is good, the metal cannot be polluted, and the casting quality is high; the shrinkage rate is kept at a low value, and the product has good dimensional stability.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (4)
1. A preparation method of precision casting modulated wax is characterized by comprising the following steps:
(1) dividing carnauba wax into two parts, heating one part at 120 ℃, continuously stirring until the carnauba wax is melted, adding the other part of carnauba wax, continuously heating, and continuously stirring until the carnauba wax is melted to obtain melted carnauba wax A;
(2) continuously heating the molten carnauba wax A obtained in the step (1) at 100-120 ℃, adding candelilla wax, and continuously stirring until the candelilla wax is completely molten to obtain a mixture B;
(3) continuously heating the mixture B obtained in the step (2) at 110-120 ℃, adding an ethylene-vinyl acetate copolymer, and continuously stirring until the mixture is completely molten to obtain a mixture C;
(4) continuously heating the mixture C obtained in the step (3) at 120 ℃, adding pure monomer resin, and continuously stirring until the pure monomer resin is completely melted to obtain a mixture D;
(5) continuously heating the mixture D obtained in the step (4) at 110-120 ℃, and continuously stirring;
(6) cooling the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring, adding microcrystalline wax at 90-100 ℃, and heating and stirring until the microcrystalline wax is molten to obtain a mixture E;
(7) and (4) continuously stirring and heating the mixture E obtained in the step (6), cooling to 80-90 ℃ and preparing into particles to obtain the precision casting blending wax.
2. The method for preparing the precision casting preparation wax according to claim 1, wherein the heating time in the step (2), the step (3) and the step (4) is 1-2 minutes.
3. The method for preparing precision casting preparation wax according to claim 1, wherein the heating time in the step (5) and the heating time in the step (7) are both 3 to 4 hours.
4. The method of claim 1, wherein the heating time in the step (6) is 30 to 60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914696.7A CN110814278A (en) | 2018-08-13 | 2018-08-13 | Preparation method of precision casting modulated wax |
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| CN201810914696.7A CN110814278A (en) | 2018-08-13 | 2018-08-13 | Preparation method of precision casting modulated wax |
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| CN110814278A true CN110814278A (en) | 2020-02-21 |
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| CN201810914696.7A Withdrawn CN110814278A (en) | 2018-08-13 | 2018-08-13 | Preparation method of precision casting modulated wax |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112341829A (en) * | 2020-11-10 | 2021-02-09 | 青岛新诺科新材料科技发展有限公司 | Modulated wax for precision casting wax mold and preparation method thereof |
| CN115975387A (en) * | 2023-02-10 | 2023-04-18 | 科米诺新材料科技(浙江)有限公司 | Preparation method of modulated wax for precision casting |
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2018
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112341829A (en) * | 2020-11-10 | 2021-02-09 | 青岛新诺科新材料科技发展有限公司 | Modulated wax for precision casting wax mold and preparation method thereof |
| CN115975387A (en) * | 2023-02-10 | 2023-04-18 | 科米诺新材料科技(浙江)有限公司 | Preparation method of modulated wax for precision casting |
| CN115975387B (en) * | 2023-02-10 | 2023-07-11 | 科米诺新材料科技(浙江)有限公司 | Preparation method of modulated wax for precision casting |
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Application publication date: 20200221 |
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