CN110819124A - Mold material for precision casting mold and preparation method thereof - Google Patents
Mold material for precision casting mold and preparation method thereof Download PDFInfo
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- CN110819124A CN110819124A CN201810914449.7A CN201810914449A CN110819124A CN 110819124 A CN110819124 A CN 110819124A CN 201810914449 A CN201810914449 A CN 201810914449A CN 110819124 A CN110819124 A CN 110819124A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Oil, Petroleum & Natural Gas (AREA)
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- Medicinal Chemistry (AREA)
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of precision casting, and particularly relates to a mold material for a precision casting mold and a preparation method thereof, wherein the mold material for the precision casting mold is prepared by sequentially adding lignite wax, polyethylene wax, candelilla wax, ethylene-vinyl acetate copolymer and stearic acid according to step communication, and has high strength and difficult deformation; 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 mold material for a precision casting mold and a preparation method thereof.
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 sodium dodecyl benzene sulfonate, stearic acid and polyethylene wax, and 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 requirement 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 mold material for a precision casting mold and a preparation method thereof, and the prepared mold material for the precision casting mold has good dimensional stability, high strength, low ash content and easy demolding.
The invention is realized by adopting the following technical scheme:
the mold material for the precision casting mold comprises the following raw materials in parts by mass: 44-46 parts of montan wax, 2.5-3.5 parts of polyethylene wax, 34-36 parts of candelilla wax, 3.5-4.5 parts of ethylene-vinyl acetate copolymer and 12-14 parts of stearic acid.
The invention also provides a method for preparing the mould material for the precision casting mould, which comprises the following steps:
(1) dividing candelilla wax into two parts, heating one part at 120 deg.C, stirring continuously to melt, adding another part of candelilla wax, heating continuously, and stirring continuously to melt to obtain molten candelilla wax A;
(2) continuously heating the molten candelilla wax A obtained in the step (1) at 100-120 ℃, adding polyethylene wax, and continuously stirring until the molten candelilla wax A 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 stearic acid, and continuously stirring until the mixture C 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) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring, adding montan wax at the temperature of 90-100 ℃, and heating and stirring until the montan 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 die material for the precision casting die.
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 invention has the beneficial effects that:
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 montan wax, 2.5 parts of polyethylene wax, 34 parts of candelilla wax, 3.5 parts of ethylene-vinyl acetate copolymer and 12 parts of stearic acid, and the mold material for the precision casting mold is prepared according to the following steps:
(1) dividing candelilla wax into two parts, heating one part at 120 deg.C, stirring continuously to melt, adding another part of candelilla wax, heating continuously, and stirring continuously to melt to obtain molten candelilla wax A;
(2) continuously heating the molten candelilla wax A obtained in the step (1) at 100 ℃ for 1 minute, adding polyethylene wax, and continuously stirring until the molten candelilla wax A 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 stearic acid, and continuously stirring until the mixture C is completely melted 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) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 30 minutes, adding montan wax at 90 ℃, and heating and stirring until the montan 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 granulating to obtain the die material for the precision casting die.
Example 2
Weighing the following components in parts by weight: 46 parts of montan wax, 3.5 parts of polyethylene wax, 36 parts of candelilla wax, 4.5 parts of ethylene-vinyl acetate copolymer and 14 parts of stearic acid, and preparing the mould material for the precision casting mould according to the following steps:
(1) dividing candelilla wax into two parts, heating one part at 120 deg.C, stirring continuously to melt, adding another part of candelilla wax, heating continuously, and stirring continuously to melt to obtain molten candelilla wax A;
(2) continuously heating the molten candelilla wax A obtained in the step (1) at 120 ℃ for 2 minutes, adding polyethylene wax, and continuously stirring until the molten candelilla wax A 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 stearic acid, and continuously stirring until the mixture C is completely melted 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) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 60 minutes, adding montan wax at the temperature of 100 ℃, and heating and stirring until the montan 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 die material for the precision casting die.
Example 3
Weighing the following components in parts by weight: 45 parts of montan wax, 3 parts of polyethylene wax, 35 parts of candelilla wax, 4 parts of ethylene-vinyl acetate copolymer and 13 parts of stearic acid, and preparing the mould material for the precision casting mould according to the following steps:
(1) dividing candelilla wax into two parts, heating one part at 120 deg.C, stirring continuously to melt, adding another part of candelilla wax, heating continuously, and stirring continuously to melt to obtain molten candelilla wax A;
(2) continuously heating the molten candelilla wax A obtained in the step (1) at 110 ℃ for 1.5 minutes, adding polyethylene wax, and continuously stirring until the molten candelilla wax A 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 stearic acid, and continuously stirring until the mixture C 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) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring for 45 minutes, adding montan wax at the temperature of 95 ℃, and heating and stirring until the montan 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 die material for the precision casting die.
In the embodiment, the montan wax and the candelilla wax are matched in parts by mass, so that the strength and the stability of the casting wax are improved, and the precision and the production efficiency of castings are further improved.
Comparative example
The mold materials for precision casting molds prepared in examples 1, 2 and 3 of the present invention were respectively used to measure various technical indexes, and three general mold materials for precision casting molds 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 mold material for precision casting mold and the mold material for general precision casting mold prepared in the embodiment of the invention
| Detecting items | Penetration/ddm | Softening point/. degree.C | Ash content | Shrinkage rate |
| Example 1 | 5.6 | 77 | 0.011 | 0.82 |
| Example 2 | 5.4 | 75 | 0.011 | 0.84 |
| Example 3 | 5.7 | 77 | 0.012 | 0.83 |
| Common mould material | 7.9 | 60 | 0.044 | 0.97 |
As can be seen from the detection results in Table 1, the mold material for the precision casting mold manufactured according to the invention has the cone penetration always kept within the range of 5-6 dmm, so that the mold material for the precision casting mold 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 (5)
1. The mold material for the precision casting mold is characterized by comprising the following raw materials in parts by mass: 44-46 parts of montan wax, 2.5-3.5 parts of polyethylene wax, 34-36 parts of candelilla wax, 3.5-4.5 parts of ethylene-vinyl acetate copolymer and 12-14 parts of stearic acid.
2. A method for producing a molding material for precision casting molds according to claim 1, comprising the steps of:
(1) dividing candelilla wax into two parts, heating one part at 120 deg.C, stirring continuously to melt, adding another part of candelilla wax, heating continuously, and stirring continuously to melt to obtain molten candelilla wax A;
(2) continuously heating the molten candelilla wax A obtained in the step (1) at 100-120 ℃, adding polyethylene wax, and continuously stirring until the molten candelilla wax A 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 stearic acid, and continuously stirring until the mixture C 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) reducing the temperature of the mixture D processed in the step (5) to 100 ℃, continuing heating and stirring, adding montan wax at the temperature of 90-100 ℃, and heating and stirring until the montan 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 die material for the precision casting die.
3. The method for producing a molding material for precision casting molds according to claim 2, wherein the heating time in each of the step (2), the step (3) and the step (4) is 1 to 2 minutes.
4. The method for producing a molding material for precision molds according to claim 2, wherein the heating time in step (5) and the heating time in step (7) are both 3 to 4 hours.
5. The method of producing a molding material for precision molds according to claim 2, wherein the heating time in the step (6) is 30 to 60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914449.7A CN110819124A (en) | 2018-08-13 | 2018-08-13 | Mold material for precision casting mold and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914449.7A CN110819124A (en) | 2018-08-13 | 2018-08-13 | Mold material for precision casting mold and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110819124A true CN110819124A (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810914449.7A Withdrawn CN110819124A (en) | 2018-08-13 | 2018-08-13 | Mold material for precision casting mold and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110819124A (en) |
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2018
- 2018-08-13 CN CN201810914449.7A patent/CN110819124A/en not_active Withdrawn
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Application publication date: 20200221 |