CN114951556A - Preparation method of low-cost water-soluble core material for compression molding process - Google Patents
Preparation method of low-cost water-soluble core material for compression molding process Download PDFInfo
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- CN114951556A CN114951556A CN202210610156.6A CN202210610156A CN114951556A CN 114951556 A CN114951556 A CN 114951556A CN 202210610156 A CN202210610156 A CN 202210610156A CN 114951556 A CN114951556 A CN 114951556A
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- 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
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Abstract
The invention discloses a preparation method of a low-cost water-soluble core material for a compression molding process, which comprises the following steps: preparation of Na + ‑K + ‑Cl ‑ ‑CO 3 2‑ Is a mixed salt melt, and the temperature of the mixed salt melt is controlled to be within 5 to 25 ℃ higher than the liquidus temperature of the salt mixture; preheating a core material mold; and (3) pouring a specified amount of mixed salt melt into the preheated core material mold at a high flow rate and limited pressure by using a melt pouring device, taking out the core material after cooling and solidification, and cooling to room temperature to obtain the low-cost water-soluble core material for the compression molding process. The low-cost water-soluble core material prepared by the invention has the performances of higher surface quality, dimensional accuracy, mechanical strength, environmental protection and the like, can bear high temperature and high pressure and is easy to remove. The salt used may be recovered by a desalination process for further use.
Description
Technical Field
The invention relates to the technical field of compression molding, in particular to a preparation method of a low-cost water-soluble core material for molding a molded product with an irregular and special-shaped hollow structure.
Background
In the molding of a molded part having an irregular and special-shaped hollow structure, it is necessary to use a core material that can be taken out of the part without damaging the part.
The core material with irregular and special shapes made of the traditional metal mold material has the problems of difficult demolding and high cost. The pouring amount and the pouring temperature of the water-soluble core material developed by the prior art are difficult to accurately control, the solidification shrinkage is easy to crack, the strength change is large, and the requirements of high surface quality and mechanical strength of a mould pressing process can not be met.
Therefore, the compression molding process for manufacturing parts with irregular and special-shaped hollow structures faces the challenge of finding a core material which has the properties of high surface quality, dimensional accuracy, mechanical strength, environmental protection and the like, can bear high temperature and high pressure, is easy to remove and has low cost.
Disclosure of Invention
In view of the above, the invention provides a low-cost water-soluble core material which has high surface quality, dimensional accuracy, mechanical strength, environmental protection and other properties, can bear high temperature and high pressure and is easy to remove, and a preparation method thereof, in order to solve the problems of difficult demoulding and high cost in the process of manufacturing parts with irregular and special-shaped hollow structures by a compression molding process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a low-cost water-soluble core material for a compression molding process comprises the following steps:
(1) preparation of Na + -K + -Cl - -CO 3 2- Is a mixed salt melt, and the temperature of the mixed salt melt is controlled to be within the range of 5-25 ℃ higher than the liquidus temperature (Tm) of the salt mixture;
(2) preheating a core material mold, and controlling the temperature of the mold to be 140-200 ℃;
(3) and (3) pouring a mixed salt melt with the volume of 1.05-1.25 times of the cavity volume of the core material mold into the preheated core material mold at 3-10MPa by using a melt pouring device, taking out the core material after cooling and solidification, and cooling to room temperature to obtain the low-cost water-soluble core material for the compression molding process.
Further, in the present invention,na as described in step (1) + -K + -Cl--CO 3 2- Is K in the melt of mixed salt + With Na + The molar ratio is 20: 80-30: 70; CO2-3 with Cl - The molar ratio is 70: 30-50: 50.
Further, the core material mold structure of the core material mold in the step (2) comprises a cavity, a flow channel and a temperature control structure;
the flow channel of the core material mould is a circular section, and the diameter of the flow channel is 4-10 mm; the interface of the runner and the cavity is positioned on the side surface or the lower surface of the cavity; the feed inlet of the flow channel is of a 30-50-degree inverted cone structure;
the temperature control structure is a circular section, and the diameter of the temperature control structure is 4-10 mm; the distance between the temperature control structure and the cavity is 5-25 mm.
Preferably, the diameter of the flow channel is 6 mm-8 mm, and the angle of the feed port of the flow channel is 35-45 degrees.
The beneficial effect of adopting the further scheme is that: in the scheme of the invention, the interface of the runner and the cavity is positioned on the side surface or the lower surface of the cavity, so that the melt sputtering and the turbulent flow generation can be avoided; the temperature control structure and the cavity are arranged at a distance so as to avoid rapid solidification of the core material and the outer skin.
Further, in the step (3), the melt pouring device comprises a material cylinder and a nozzle, the material cylinder has volume identification and heat preservation functions, the nozzle is of a conical structure, the tip of the nozzle is matched with the feed inlet of the runner, and the other end of the nozzle is communicated with the bottom of the material cylinder.
Further, the low-cost water-soluble core material for compression molding process prepared in the step (3) is packaged with a sealing bag during storage and then placed into a dryer.
The invention has the beneficial effects that:
1. the low-cost water-soluble core material has the properties of high surface quality, high dimensional accuracy, high mechanical strength, environmental protection and the like, can bear high temperature and high pressure, and is easy to remove. The salt used may be recovered by a desalination process for further use.
2. The core material mold structure and the melt pouring device structure have universality, can be suitable for preparing the core material with a complex structure, are simple and convenient to operate, and have small injection pressure, so that the salt core is favorably dissolved.
3. The preparation method of the low-cost water-soluble core material has the characteristics of wide applicability, low cost, simple and convenient operation and convenience for batch production.
4. The low-cost water-soluble core material can be used for manufacturing parts with complex structures, in particular to hollow structure mould pressing parts with irregular and special shapes.
Drawings
FIG. 1 is a flow chart of a method for preparing a low cost water soluble core material for use in a compression molding process according to the present invention;
FIG. 2 shows Na provided by the present invention + -K + -Cl--CO 3 2- Is a schematic illustration of a mixed salt melt;
FIG. 3 is a schematic view of a core mold structure provided by the present invention;
fig. 4 is a schematic view of a melt caster according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a low-cost water-soluble core material for a compression molding process comprises the following steps:
(1) preparation of Na + -K + -Cl - CO 3 2- Is a mixed salt melt, and the temperature of the mixed salt melt is controlled to be higher than the liquidus temperature (T) of the salt mixture m ) In the range of 5-25 ℃;
(2) preheating a core material mold, and controlling the temperature of the mold to be 170 ℃;
(3) and (3) pouring the mixed salt melt with the volume of 1.15 times of the cavity volume of the core material mold into the preheated core material mold at 7MPa by using a melt pouring device, taking out the core material after cooling and solidification, and cooling to room temperature to obtain the low-cost water-soluble core material for the compression molding process.
In one embodiment, the core material mold structure in the step (2) comprises a cavity, a runner and a temperature control structure;
the flow channel of the core material mould is a circular section, and the diameter of the flow channel is 4-10 mm; the interface of the runner and the cavity is positioned on the side surface or the lower surface of the cavity; the feed inlet of the flow channel is of a 30-50-degree inverted cone structure;
the temperature control structure is a circular section, and the diameter of the temperature control structure is 4-10 mm; the distance between the temperature control structure and the cavity is 5-25 mm.
In another embodiment, the diameter of the flow channel is 6 mm-8 mm, and the angle of the feed port of the flow channel is 35-45 degrees.
In one embodiment, the melt pouring device in the step (3) comprises a material barrel and a nozzle, wherein the material barrel has the functions of volume identification and heat preservation, the nozzle is in a conical structure, the tip of the nozzle is matched with the feed port of the runner, and the other end of the nozzle is communicated with the bottom of the material barrel.
In one embodiment, the low-cost water-soluble core material for compression molding process prepared in step (3) is placed in a dryer after being sealed with a sealing bag at the time of storage.
Example 2
According to the scheme of example 1, a mixed salt melt is prepared by using the raw materials shown in the table 1;
TABLE 1 Mixed salt composition materials
And melting the mixed salt, controlling the temperature of the melt at 642 ℃, pouring the melt into a preheated bending strength sample mold (the temperature of the mold is 150 ℃) by using a melt pouring device, cooling for 2min, and taking out. Three specimens were prepared for each component and the specimens were tested for flexural strength after cooling to room temperature, with the results shown in table 2:
TABLE 2 bending Strength of Mixed salts
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. A preparation method of a low-cost water-soluble core material for a compression molding process is characterized by comprising the following steps:
(1) preparation of Na + -K + -Cl - -CO 3 2- The temperature of the mixed salt melt is controlled to be higher than the liquidus temperature of the salt mixture by 5-25 ℃;
(2) preheating a core material mold, and controlling the temperature of the mold to be 140-200 ℃;
(3) and (3) pouring the mixed salt melt which is 1.05-1.25 times of the volume of the cavity of the core material mold into the preheated core material mold at 3-10MPa by using a melt pouring device, taking out the core material after cooling and solidification, and cooling to room temperature to obtain the low-cost water-soluble core material for the compression molding process.
2. A method of producing a low cost water soluble core material for use in a compression moulding process as claimed in claim 1 wherein the Na in step (1) + -K + -Cl - -CO 3 2- Is K in the melt of mixed salt + With Na + The molar ratio is 20: 80-30: 70; CO2 3 2- With Cl - The molar ratio is 70: 30-50: 50.
3. The method for preparing a low-cost water-soluble core material for compression molding process according to claim 1, wherein the core material mold structure in the step (2) comprises a cavity, a flow passage and a temperature control structure;
the flow channel of the core material mould is a circular section, and the diameter of the flow channel is 4-10 mm; the interface of the runner and the cavity is positioned on the side surface or the lower surface of the cavity; the feed inlet of the flow channel is of a 30-50-degree inverted cone structure;
the temperature control structure is a circular section, and the diameter of the temperature control structure is 4-10 mm; the distance between the temperature control structure and the cavity is 5-25 mm.
4. The method of claim 3, wherein the melt caster in step (3) comprises a barrel and a nozzle, the barrel has the functions of volume marking and heat preservation, the nozzle is in a conical structure, the tip of the nozzle is matched with the feed inlet of the runner, and the other end of the nozzle is communicated with the bottom of the barrel.
5. The method of preparing a low-cost water-soluble core material for a compression molding process according to claim 1, wherein the low-cost water-soluble core material for a compression molding process prepared in the step (3) is sealed with a sealing bag and put into a dryer at the time of storage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210610156.6A CN114951556A (en) | 2022-05-31 | 2022-05-31 | Preparation method of low-cost water-soluble core material for compression molding process |
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| CN202210610156.6A CN114951556A (en) | 2022-05-31 | 2022-05-31 | Preparation method of low-cost water-soluble core material for compression molding process |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5303761A (en) * | 1993-03-05 | 1994-04-19 | Puget Corporation | Die casting using casting salt cores |
| US20090205801A1 (en) * | 2006-05-18 | 2009-08-20 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing expendable salt core for casting and expendable salt core for casting |
| US20110062624A1 (en) * | 2008-05-09 | 2011-03-17 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing expendable salt core for casting |
| US20120048502A1 (en) * | 2009-05-01 | 2012-03-01 | Yamaha Hatsudoki Kabushiki Kaisha | Method for producing salt core for casting |
| JP2013099768A (en) * | 2011-11-09 | 2013-05-23 | Tohoku Univ | Method for manufacturing salt core for casting |
| WO2014108419A1 (en) * | 2013-01-09 | 2014-07-17 | Emil Müller GmbH | Salt cores infiltrated with molten salt, preferably for diecasting applications |
| JP2016064436A (en) * | 2014-09-25 | 2016-04-28 | スズキ株式会社 | Manufacturing method of casting salt core and casting salt core |
| CN105798308A (en) * | 2016-03-29 | 2016-07-27 | 齐鲁工业大学 | Water-soluble salt core type metal powder injection molding technology |
-
2022
- 2022-05-31 CN CN202210610156.6A patent/CN114951556A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5303761A (en) * | 1993-03-05 | 1994-04-19 | Puget Corporation | Die casting using casting salt cores |
| US20090205801A1 (en) * | 2006-05-18 | 2009-08-20 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing expendable salt core for casting and expendable salt core for casting |
| US20110062624A1 (en) * | 2008-05-09 | 2011-03-17 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing expendable salt core for casting |
| US20120048502A1 (en) * | 2009-05-01 | 2012-03-01 | Yamaha Hatsudoki Kabushiki Kaisha | Method for producing salt core for casting |
| JP2013099768A (en) * | 2011-11-09 | 2013-05-23 | Tohoku Univ | Method for manufacturing salt core for casting |
| WO2014108419A1 (en) * | 2013-01-09 | 2014-07-17 | Emil Müller GmbH | Salt cores infiltrated with molten salt, preferably for diecasting applications |
| JP2016064436A (en) * | 2014-09-25 | 2016-04-28 | スズキ株式会社 | Manufacturing method of casting salt core and casting salt core |
| CN105798308A (en) * | 2016-03-29 | 2016-07-27 | 齐鲁工业大学 | Water-soluble salt core type metal powder injection molding technology |
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