CN115815535A - Liquid nitrogen seepage air-blast molding method and device for freeze casting - Google Patents
Liquid nitrogen seepage air-blast molding method and device for freeze casting Download PDFInfo
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- CN115815535A CN115815535A CN202310058848.9A CN202310058848A CN115815535A CN 115815535 A CN115815535 A CN 115815535A CN 202310058848 A CN202310058848 A CN 202310058848A CN 115815535 A CN115815535 A CN 115815535A
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Abstract
The invention belongs to the technical field of casting molding, and particularly relates to a liquid nitrogen seepage air-blast molding method and a device for freezing casting.
Description
Technical Field
The invention relates to the technical field of casting molding, in particular to a liquid nitrogen seepage air-blast molding method and a device for freezing casting.
Background
In recent years, with the rapid development of the world industrialization degree, the demand on the foundry industry is increasing, and the traditional foundry uses resin, bentonite, coal powder and the like as the molding sand binder, so that the working environment is filled with dust, waste gas caused by incomplete combustion of the resin and the like, and a large amount of industrial waste is generated, thereby not only polluting the environment and damaging the health of workers, but also the cost of later recovery treatment is not small.
The traditional freezing casting method adopts a liquid nitrogen cooling method to realize the freezing modeling of the mixture of the molding sand and the water, the casting mold obtained by the freezing casting method only comprises the molding sand and the water, the automatic shakeout can be realized after the pouring, the cleaning process after the pouring is simplified, the process is simple, the environment is protected, and the cost is saved. Although the requirement of green development is met, the freezing speed is low, the compactness of the sand mold is uneven, the quality of castings is influenced, and the method is not suitable for large-scale mass production.
Disclosure of Invention
In order to solve the problems in the prior art, the invention mainly aims to provide a liquid nitrogen seepage air-blast molding method and a device for freezing casting.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a liquid nitrogen seepage air-blast molding method for freezing casting comprises the following steps:
s1, filling sand;
s2, flushing liquid nitrogen into a sand box;
s3, pre-compacting by small air impact; opening the small air blast valve, and allowing the compressed air in the compressed air storage cavity to enter the sand box to finish the small air blast pre-compaction;
s4, compacting by atmosphere; opening the atmospheric flushing valve after closing the small flushing valve, and allowing high-pressure air in the air tank to enter the sand box to finish atmospheric flushing compaction;
and S5, taking out the pattern to obtain a casting mold.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for freezing casting is as follows: in the step S1, a mould is placed in a sand box on a mould bottom plate, moulding sand is spread in the sand box, the moulding sand amount depends on the size of the mould, the general sand filling height is preferably more than 20cm, and the mould is simply tamped to ensure the filling of the moulding sand at the deep concave part of the mould plate and the sand box.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for the freezing casting is as follows: in the step S1, the excessive molding sand above the auxiliary frame is scraped by a scraper.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for the freezing casting is as follows: in the step S1, the molding sand is silica sand, clay is added to increase the adhesiveness of the molding sand, the water content in the molding sand is kept between 3 and 5 weight percent, and the clay content is 3 to 10 weight percent.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for the freezing casting is as follows: in the step S2, a small air flushing valve is opened, liquid nitrogen is flushed into the sand box through a liquid nitrogen flushing inlet, and a heat preservation device is adopted to ensure that the temperature of the flushed liquid nitrogen is less than or equal to-130 ℃; and closing the small air flushing valve, and standing for 2-3min to ensure that the liquid nitrogen fully permeates into the gaps of the molding sand.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for the freezing casting is as follows: in the step S2, the mass ratio of the liquid nitrogen to the molding sand is 0.5-1.0, the flow rate of the liquid nitrogen is controlled to be 20-30mL/S, the liquid nitrogen possibly remains in the small gas flushing valve when being flushed, and the liquid nitrogen can be completely discharged through the small gas flushing compaction.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for the freezing casting is as follows: in the step S3, before the small air impact is pre-compacted, compressed air with the air pressure of 3-15MPa is stored in a compressed air storage cavity; in the small air impact pre-tightening process, the pressure increasing rate of compressed air entering the top of the sand box and contacting with the molding sand is 100-180MPa/s, and the small air impact pre-tightening is completed within 3-5 s.
The preferable scheme of the liquid nitrogen seepage air-blast molding method for the freezing casting is as follows: in the step S4, high-pressure air with the air pressure of 15-30MPa is stored in an air tank before the atmosphere is compacted; in the atmospheric compaction process, the pressure rising rate of the high-pressure air entering the top of the sand box and contacting with the molding sand is 150-230MPa/s, and the atmospheric compaction is completed within 5-10s by air blasting.
In order to solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solutions:
a liquid nitrogen seepage air-blast molding device for freezing casting comprises:
the device comprises a gas tank, an atmospheric flushing valve, a small pneumatic flushing valve, a sand box and a compressed air storage cavity;
the air tank is positioned at the upper part of the sand box and used for storing high-pressure air, and the high-pressure air enters the sand box through the opening and closing of the atmospheric flushing valve to finish atmospheric flushing compaction; the compressed air storage cavity is located at the upper part of the sand box and is not communicated with the air tank and used for storing compressed air, and the compressed air enters the sand box through the opening and closing of the small air flushing valve to complete small air flushing compaction.
As a preferable aspect of the liquid nitrogen seepage air-blast molding device for chill casting according to the present invention, wherein: the small air blast valve is provided with a small hole, and the area ratio of the small hole to the small air blast valve is 1:20-50.
As a preferable aspect of the liquid nitrogen seepage air-blast molding device for chill casting according to the present invention, wherein: the area ratio of the small air flushing valve to the large air flushing valve is 1:8-20.
As a preferable aspect of the liquid nitrogen seepage air-blast molding device for chill casting according to the present invention, wherein: the device further comprises an auxiliary frame, a mold bottom plate, a workbench and a liquid nitrogen flushing port, wherein the auxiliary frame is located at the upper part of the sand box and at the lower part of the gas tank, the mold bottom plate is located at the lower part of the sand box, the workbench is located at the lower parts of the mold bottom plate and the sand box, the liquid nitrogen flushing port is communicated with the compressed air storage cavity, and liquid nitrogen is guided into the sand box through opening and closing of the small gas flushing valve.
The invention has the following beneficial effects:
the invention provides a liquid nitrogen seepage air-blast molding method and a device for freezing casting, wherein liquid nitrogen is blasted above a sand mold before air blast, the liquid nitrogen is compacted by combining small air blast compaction with atmospheric compaction, primary air blast and secondary air flow rebound are fully utilized to enable the liquid nitrogen to uniformly permeate the sand mold, a casting mold with uniform freezing density and excellent freezing effect is favorably obtained after air blast, the molding time is shortened by one time compared with the prior art, the performances of the sand mold such as tensile strength, compressive strength, air permeability and the like are improved by more than 30 percent compared with the prior art, the requirements of large-scale mass production can be met, and the quality of castings is favorably improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of a liquid nitrogen seepage air-blast molding device for chill casting according to the present invention.
The reference numbers illustrate:
1-air tank, 2-liquid nitrogen inlet, 3-atmosphere air flushing valve, 4-auxiliary frame, 5-sand box, 6-workbench, 7-compressed air storage cavity, 8-small air flushing valve and 9-die bottom plate.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
The invention provides a liquid nitrogen seepage air-blast molding method and a device for freezing casting, which have the advantages of short molding time and high quality, can meet the requirements of large-scale mass production, and is more favorable for improving the quality of castings.
According to one aspect of the invention, the invention provides the following technical scheme:
a liquid nitrogen seepage air-blast molding method for freezing casting comprises the following steps:
s1, filling sand;
s2, flushing liquid nitrogen into a sand box 5;
s3, pre-compacting by small air impact; opening the small air blast valve 8, and allowing the compressed air in the compressed air storage cavity 7 to enter the sand box 5 to finish the small air blast pre-compaction;
s4, compacting the atmosphere; after the small air flushing valve 8 is closed, the atmospheric flushing valve 3 is opened, high-pressure air in the air tank 1 enters the sand box 5, and atmospheric flushing compaction is completed;
and S5, taking out the mold to obtain a casting mold.
In the step S1, a pattern is placed in the sand box 5 on the mold bottom plate 9, molding sand is spread in the sand box 5, the amount of the molding sand depends on the size of the mold, the height of the filling sand is preferably more than 20cm, and the filling sand is simply tamped to ensure the filling of the molding sand in the deep concave part of the mold plate and the sand box. And scraping the excessive molding sand above the auxiliary frame 4 by a scraper. The molding sand is silica sand, clay is added to increase the adhesiveness, the water content in the molding sand is kept between 3 and 5 weight percent, and the clay content is 3 to 10 weight percent. Specifically, the moisture in the molding sand should be maintained in a range such as, but not limited to, any one or between any two of 3wt%, 3.5wt%, 4wt%, 4.5wt%, 5 wt%; the clay content is, for example, but not limited to, any one of 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, or a range between any two. Because the molding sand does not adopt resin, bentonite, coal powder and the like as a molding sand binder, waste gas is not generated after casting, the amount of waste sand is reduced to a great extent, and the molding sand is green and environment-friendly.
In the step S2, the small air flushing valve 8 is opened, liquid nitrogen is flushed into the sand box through the liquid nitrogen flushing inlet 2, and a heat preservation device is adopted to ensure that the temperature of the flushed liquid nitrogen is less than or equal to-130 ℃; and closing the small air flushing valve 8, and standing for 2-3min to ensure that the liquid nitrogen fully permeates into the gaps of the molding sand. The mass ratio of the liquid nitrogen to the molding sand is 0.5-1.0, the flow rate of the liquid nitrogen is controlled to be 20-30mL/s, the liquid nitrogen possibly remains in the small air-blast valve 8 when being flushed, and the residual liquid nitrogen in the small air-blast valve 8 can be discharged as much as possible through the small air-blast compaction. Specifically, the standing time is, for example, but not limited to, any one of 2min, 2min10s, 2min20s, 2min30s, 2min40s, 2min50s, and 3min or a range between any two of them; the mass ratio of the liquid nitrogen to the molding sand is, for example, but not limited to, any one of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0 or a range between any two thereof; the flow rate of liquid nitrogen is controlled in a range such as, but not limited to, any one of 20mL/s, 22mL/s, 24mL/s, 26mL/s, 28mL/s, 30mL/s, or any two between them.
In the step S3, before the small air impact is pre-compacted, compressed air with the air pressure of 3-15MPa is stored in a compressed air storage cavity; in the small air impact pre-tightening process, the pressure increasing rate of compressed air entering the top of the sand box and contacting with the molding sand is 100-180MPa/s, and the small air impact pre-tightening is completed within 3-5 s. Specifically, the pressure of the compressed air is, for example, but not limited to, any one of 3MPa, 4MPa, 5MPa, 6MPa, 7MPa, 8MPa, 9MPa, 10MPa, 11MPa, 12MPa, 13MPa, 14MPa, and 15MPa, or a range between any two of them; the boost rate is, for example, but not limited to, any one of 100MPa/s, 110MPa/s, 120MPa/s, 130MPa/s, 140MPa/s, 150MPa/s, 160MPa/s, 170MPa/s, 180MPa/s, or a range between any two; the air-pulse time is, for example, but not limited to, any one of 3s, 3.5s, 4s, 4.5s, 5s or a range between any two.
In the step S4, high-pressure air with the air pressure of 15-30MPa is stored in an air tank before the atmosphere is compacted; in the atmospheric compaction process, the pressure rising rate of the high-pressure air entering the top of the sand box and contacting with the molding sand is 150-230MPa/s, and the atmospheric compaction is completed within 5-10s by air blasting. Specifically, the pressure of the high-pressure air is, for example, but not limited to, any one of 15MPa, 16MPa, 17MPa, 18MPa, 19MPa, 20MPa, 21MPa, 22MPa, 23MPa, 24MPa, 25MPa, 26MPa, 27MPa, 28MPa, 29MPa, and 30MPa, or a range between any two of them; the boost rate is, for example, but not limited to, any one of 150MPa/s, 160MPa/s, 170MPa/s, 180MPa/s, 190MPa/s, 200MPa/s, 210MPa/s, 220MPa/s, 230MPa/s, or a range between any two; the air impingement time is, for example, but not limited to, a range between any one or any two of 5s, 5.5s, 6s, 6.5s, 7s, 7.5s, 8s, 8.5s, 9s, 9.5s, 10 s.
According to another aspect of the invention, the invention provides the following technical scheme:
a liquid nitrogen seepage air-blast molding device for freezing casting, as shown in figure 1, comprises:
the device comprises an air tank 1, an atmospheric flushing valve 3, a small flushing valve 8, a sand box 5 and a compressed air storage cavity 7;
the air tank 1 is positioned at the upper part of the sand box 5 and is used for storing high-pressure air, and the high-pressure air enters the sand box 5 through the opening and closing of the atmospheric flushing valve 3 to finish atmospheric flushing compaction; the compressed air storage cavity 7 is positioned in the air tank 1 and is not communicated with the air tank 1 and is used for storing compressed air, and the compressed air enters the sand box 5 through the opening and closing of the small air flushing valve 8 to complete the small air flushing compaction; set up the aperture on the little air blast valve 8, and aperture area and little air blast valve 8 area ratio are 1:20-50. The area ratio of the small air flushing valve 8 to the large air flushing valve 3 is 1:8-20. Specifically, the orifice area to small gas washout valve 8 area ratio is, for example but not limited to, in the range of any one or both of 1; the area ratio of the small air blast valve 8 to the large air blast valve 3 is 1:8, 1:9, 1.
The device further comprises an auxiliary frame 4, a mold bottom plate 9, a workbench 6 and a liquid nitrogen flushing port 2, wherein the auxiliary frame 4 is located at the upper part of the sand box 5 and at the lower part of the gas tank 1, the mold bottom plate 9 is located at the lower part of the sand box 5, the workbench 6 is located at the lower parts of the mold bottom plate 9 and the sand box 5, the liquid nitrogen flushing port 2 is communicated with the compressed air storage cavity 7, and liquid nitrogen is guided into the sand box through opening and closing of the small gas flushing valve 8.
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
A liquid nitrogen seepage air-blast molding method for freezing casting comprises the following steps:
s1, filling sand; the mould is placed in the upper sand box 5 of the mould bottom plate 9, the moulding sand is spread in the sand box 5, the quantity of the moulding sand depends on the size of the mould, the height of the filling sand is 50cm, the filling sand is simply tamped to ensure the filling of the moulding sand at the deep concave part of the mould plate and the sand box, the tamping time is about 20s, and the tamping frequency is 60Hz. And scraping redundant molding sand above the auxiliary frame 4 by a scraper, and ensuring that the amount deviation of the molding sand filled in each box is less than or equal to 3-5% of the total sand filling volume of the sand box. The molding sand is silica sand, clay is added to increase the adhesiveness, the water content in the molding sand is kept at 3wt%, and the clay content is 5wt%.
S2, flushing liquid nitrogen into a sand box 5; opening a small air flushing valve 8, flushing liquid nitrogen into the sand box through a liquid nitrogen flushing inlet 2, and ensuring that the temperature of flushing liquid nitrogen is less than or equal to-130 ℃ by adopting a heat preservation device; and closing the small air flushing valve 8, and standing for 2min to ensure that the liquid nitrogen fully permeates into the gaps of the molding sand. The mass ratio of the liquid nitrogen to the molding sand was 0.75, and the flow rate of the liquid nitrogen was controlled at 20mL/s.
S3, pre-compacting by small air impact; before the small air impact is compacted in advance, compressed air with the air pressure of 10MPa is stored in a compressed air storage cavity 7; opening the small air blast valve 8, and allowing the compressed air in the compressed air storage cavity 7 to enter the sand box 5 to finish the small air blast pre-compaction; the pressure increasing speed of the compressed air entering the top of the sand box and contacting with the molding sand is 150MPa/s, and the air impact is performed for 3s to finish small air impact pre-compaction.
S4, compacting the atmosphere; before the atmosphere is compacted, high-pressure air with the air pressure of 30MPa is stored in the air tank 1; in the real-time atmospheric compaction, the small air flushing valve 8 is closed, then the atmospheric flushing valve 3 is opened, and high-pressure air in the air tank 1 enters the sand box 5 to finish the atmospheric compaction; the pressure increasing speed of the high-pressure air entering the top of the sand box and contacting with the molding sand is 200MPa/s, and the air impact is completed for 5 s.
And S5, taking out the pattern to obtain a casting mold.
The casting mold of example 1 is used to cast an aluminum alloy casting with a variable wall thickness, a thermal insulation coating is uniformly sprayed in the cavity of the casting mold by a spraying method, molten metal is poured into the casting mold, the molten metal is solidified into a shell in the casting mold, after the shell is formed outside, a coolant is rapidly sprayed on the wall thickness part of the freezing casting mold, and collapse shakeout is rapidly dissolved in the wall thickness part of the freezing casting mold in a dissolving manner.
Example 2
A liquid nitrogen seepage air-blast molding method for freezing casting comprises the following steps:
s1, filling sand; the mould is placed in the upper sand box 5 of the mould bottom plate 9, the moulding sand is spread in the sand box 5, the moulding sand amount depends on the size of the mould, the height of the filled sand is 40cm, the mould is simply tamped to ensure the filling of the moulding sand at the deep concave part of the mould plate and the sand box, the tamping time is about 30s, and the tamping frequency is 100Hz. And scraping redundant molding sand above the auxiliary frame 4 by a scraper, and ensuring that the amount deviation of the molding sand filled in each box is less than or equal to 3-5% of the total sand filling volume of the sand box. The molding sand is silica sand, clay is added to increase the adhesiveness, the water content in the molding sand is kept at 5wt%, and the clay content is 6wt%.
S2, flushing liquid nitrogen into a sand box 5; opening a small air flushing valve 8, flushing liquid nitrogen into the sand box through a liquid nitrogen flushing inlet 2, and ensuring that the temperature of flushing liquid nitrogen is less than or equal to-130 ℃ by adopting a heat preservation device; and closing the small air flushing valve 8, and standing for 2min to ensure that the liquid nitrogen fully permeates into the gaps of the molding sand. The mass ratio of the liquid nitrogen to the molding sand was 0.7, and the flow rate of the liquid nitrogen was controlled at 25mL/s.
S3, pre-compacting by small air impact; before the small air impact is compacted in advance, compressed air with the air pressure of 15MPa is stored in the compressed air storage cavity 7; opening the small air blast valve 8, and allowing the compressed air in the compressed air storage cavity 7 to enter the sand box 5 to finish the small air blast pre-compaction; the pressure increasing rate of the compressed air entering the top of the sand box and contacting with the molding sand is 160MPa/s, and the air impact is 5s to complete small air impact pre-compaction.
S4, compacting the atmosphere; before the atmosphere is compacted, high-pressure air with the air pressure of 30MPa is stored in the air tank 1; in the real-time atmospheric impact, the small air impact valve 8 is closed, then the atmospheric impact valve 3 is opened, and high-pressure air in the air tank 1 enters the sand box 5 to complete the atmospheric impact compaction; the pressure increasing speed of the high-pressure air entering the top of the sand box and contacting with the molding sand is 200MPa/s, and the air impact is carried out for 8s to complete the atmospheric impact compaction.
And S5, taking out the pattern to obtain a casting mold.
The casting mold of example 2 was used to cast nodular cast iron, and molten iron was poured into the casting mold by centrifugal casting, and the nodular cast iron solidified into a shell in the casting mold.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A liquid nitrogen seepage air-blast molding method for freezing casting is characterized by comprising the following steps:
s1, filling sand;
s2, flushing liquid nitrogen into a sand box;
s3, pre-compacting by small air impact; opening the small air blast valve, and allowing the compressed air in the compressed air storage cavity to enter the sand box to finish the small air blast pre-compaction;
s4, compacting by atmosphere; opening the atmospheric flushing valve after closing the small flushing valve, and allowing high-pressure air in the air tank to enter the sand box to finish atmospheric flushing compaction;
and S5, taking out the pattern to obtain a casting mold.
2. The molding method according to claim 1, wherein in step S1, silica sand is used as the molding sand, clay is added to increase the adhesion of the molding sand, the water content of the molding sand is maintained at 3 to 5wt%, and the clay content is 3 to 10wt%.
3. The molding method according to claim 1, wherein in said step S2, the small air blast valve is opened, and after the liquid nitrogen is blown into the flask through the liquid nitrogen blow-in port, the small air blast valve is closed and left to stand for 2 to 3 minutes.
4. The molding method according to claim 1, wherein in said step S2, the mass ratio of the liquid nitrogen to the molding sand is 0.5 to 1.0, and the flow rate of the liquid nitrogen is controlled to 20 to 30mL/S.
5. The molding method according to claim 1, wherein in said step S3, before the small air shot is pre-compacted, compressed air having an air pressure of 3 to 15MPa is stored in the compressed air storage chamber; in the small air impact pre-tightening process, the pressure increasing rate of compressed air entering the top of the sand box and contacting with the molding sand is 100-180MPa/s, and the small air impact pre-tightening is completed within 3-5 s.
6. The molding method according to claim 1, wherein in said step S4, before the atmosphere is compacted, high-pressure air having an air pressure of 15 to 30MPa is stored in an air tank; in the atmospheric compaction process, the pressure rising rate of the high-pressure air entering the top of the sand box and contacting with the molding sand is 150-230MPa/s, and the atmospheric compaction is completed within 5-10s by air blasting.
7. A liquid nitrogen seepage air-blast molding device for freezing casting, which is used for realizing the molding method of claim 1, and is characterized by comprising the following steps:
the device comprises a gas tank, an atmospheric flushing valve, a small pneumatic flushing valve, a sand box and a compressed air storage cavity;
the air tank is positioned at the upper part of the sand box and used for storing high-pressure air, and the high-pressure air enters the sand box through the opening and closing of the atmospheric flushing valve to finish atmospheric flushing compaction; the compressed air storage cavity is positioned at the upper part of the sand box and is not communicated with the air tank and used for storing compressed air, and the compressed air enters the sand box through the opening and closing of the small air flushing valve to complete the small air flushing compaction.
8. The molding machine as claimed in claim 7, wherein the small air blast valve is provided with a small hole, and the ratio of the area of the small hole to the area of the small air blast valve is 1:20-50.
9. The molding machine of claim 7, wherein the area ratio of the small air blast valve to the large air blast valve is 1:8-20.
10. The molding machine according to claim 7, further comprising an auxiliary frame, a die base plate, a table, a liquid nitrogen flushing port; the auxiliary frame is located on the upper portion of the sand box and located on the lower portion of the gas tank, the mold bottom plate is located on the lower portion of the sand box, the workbench is located on the lower portion of the mold bottom plate and the lower portion of the sand box, the liquid nitrogen flushing port is communicated with the compressed air storage cavity, and liquid nitrogen is guided into the sand box through opening and closing of the small gas flushing valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117086264A (en) * | 2023-10-19 | 2023-11-21 | 中北大学 | Casting method combining frozen sand mold and gypsum mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117086264A (en) * | 2023-10-19 | 2023-11-21 | 中北大学 | Casting method combining frozen sand mold and gypsum mold |
| CN117086264B (en) * | 2023-10-19 | 2023-12-19 | 中北大学 | Casting method combining frozen sand mold and gypsum mold |
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