CN113523184A - Magnesium alloy sand mold casting method - Google Patents
Magnesium alloy sand mold casting method Download PDFInfo
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- CN113523184A CN113523184A CN202110637312.3A CN202110637312A CN113523184A CN 113523184 A CN113523184 A CN 113523184A CN 202110637312 A CN202110637312 A CN 202110637312A CN 113523184 A CN113523184 A CN 113523184A
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- 238000005266 casting Methods 0.000 title claims abstract description 75
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- 239000000956 alloy Substances 0.000 claims abstract description 63
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 62
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- QRNPTSGPQSOPQK-UHFFFAOYSA-N magnesium zirconium Chemical compound [Mg].[Zr] QRNPTSGPQSOPQK-UHFFFAOYSA-N 0.000 claims description 14
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
Abstract
The invention provides a magnesium alloy sand casting method, which comprises the following steps: after the components of the magnesium alloy are proportioned according to a proportion, the components are sequentially added into a melting crucible to be melted from high to low according to the evaporation heat; placing the mixture in a smelting furnace, starting an ultrasonic generator, and mixing TiB2Adding the powder and the Mg-Zr intermediate alloy into the magnesium alloy melt, and then refining, wherein ultrasonic treatment is carried out in the refining process; fishing out slag in the magnesium alloy melt after refining is finished, and standing the obtained molten metal; designing an alloy casting sand mold according to a target alloy casting, and preparing the alloy casting sand mold by using resin sand; installing ultrasonic generator outside alloy casting sand moldA sand box of the machine; setting parameters of an ultrasonic generator in a sand box, starting the generator, and pouring the obtained molten metal into a sand mold cavity; and after the molten metal is filled and cooled, closing the ultrasonic generator. The invention achieves the purpose of refining alloy grains by combining staged ultrasound and a specific refiner, and has the characteristics of simple operation, wide application range and obvious effect.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a magnesium alloy sand mold casting method.
Background
The magnesium alloy is the most potential high-performance structural material in light alloy materials due to the advantages of low density, good weight reduction effect and the like, has attracted great interest in the fields of aerospace, automobiles, electronics and the like in recent years, and as the lightest common metal structural material, the popularization and application of the magnesium alloy can meet the increasingly severe requirement on light weight targets, and great social, economic and military benefits are created. And part of high-precision field products have the characteristics of small batch size, large size, complex structure and short production time, and sand casting is an economical and practical method capable of quickly responding aiming at the characteristics. However, sand casting has the characteristic of slow cooling, which leads to the increase of the grain size of the alloy and difficult liquid feeding, thereby further deteriorating the mechanical property and the casting property of the alloy.
The magnesium alloy has a close-packed hexagonal structure, and the Hall-Petch constant value is very large (280-320 Mpa.mu m)0.5) And the grain refining is three times higher than that of aluminum alloy, and the potential of improving the mechanical property by grain refining is large. The existing grain refining methods include both grain refiners and physical refining. The grain refiner comprises Zr-containing master alloy, B, Al-C and the like, and has certain grain refining effect. The physical refining method comprises methods such as mechanical vibration, electromagnetic stirring and the like, and is generally limited due to process conditionsThe limitation of use is large. Therefore, it is very important to develop an effective grain refining method suitable for sand casting, especially a method which can be used in combination with a grain refiner and plays a role in refining grains by coupling.
Disclosure of Invention
Aiming at overcoming the defects in the prior art, the inventor of the invention carries out intensive research and provides a sand casting method for magnesium alloy, aiming at the problem that the mechanical property and the casting property of the alloy are deteriorated due to the increase of the grain size of the magnesium alloy, TiB is adopted2Powder and magnesium-zirconium (Mg-Zr) master alloy as grain refiner to obtain grain refined magnesium alloy based on TiB2When the powder and the magnesium-zirconium (Mg-Zr) intermediate alloy are used as grain refiners, the powder and large-size Zr particles are easy to agglomerate in molten liquid, and TiB is dispersed by ultrasonic treatment by combining the advantages of high rigidity, high density and difficult shakeout of resin sand2The method refines the crystal grains by a physical method, has the advantages of wide application range, no damage to melt purity and chemical components, deep refinement of the crystal grains of the magnesium alloy and the like, can be used for preparing the magnesium alloy with excellent performance under industrial production conditions, and has outstanding mechanical properties of the prepared magnesium alloy, thereby completing the method.
The technical scheme provided by the invention is as follows:
a sand casting method for magnesium alloy comprises the following steps:
after the components of the magnesium alloy are proportioned according to a proportion, the components are sequentially added into a melting crucible to be melted from high to low according to the evaporation heat;
placing the mixture in a smelting furnace, starting an ultrasonic generator, and mixing TiB2Adding the powder and the Mg-Zr intermediate alloy into the magnesium alloy melt, and then refining, wherein ultrasonic treatment is carried out in the refining process;
fishing out slag in the magnesium alloy melt after refining is finished, and standing the obtained molten metal;
designing an alloy casting sand mold according to a target alloy casting, and preparing the alloy casting sand mold by using resin sand;
installing a sand box containing an ultrasonic generator outside the alloy casting sand mold;
setting parameters of an ultrasonic generator in a sand box, starting the generator, and pouring the obtained molten metal into a sand mold cavity;
and after the molten metal is filled and cooled, closing the ultrasonic generator, and dismantling the sand box and the sand mould to obtain the magnesium alloy casting.
The magnesium alloy sand casting method provided by the invention has the following beneficial effects:
(1) the invention provides a casting method of a magnesium alloy sand mold, which adopts a dynamic refining method of ultrasonic oscillation and adopts ultrasonic treatment in the processes of adding a refiner, refining magnesium alloy and filling and solidifying the magnesium alloy in a sand mold cavity, thereby effectively solving the problem of TiB2When the powder and the Mg-Zr intermediate alloy are used as grain refiners, the powder and large-size Zr particles are easy to agglomerate in the molten liquid, thus being beneficial to playing the grain refining role;
(2) the invention provides a magnesium alloy sand casting method, which adopts ultrasonic treatment in the filling solidification process of magnesium alloy sand casting, sets a set working frequency, enables the inside of the solidified magnesium alloy melt to generate a 'cavitation effect', can enable liquid metal to generate strong convection in the solidification process, and can promote the propagation of crystal nuclei from the following two aspects: firstly, primary crystals can be broken through ultrasonic oscillation, primary crystal grains become new nucleation cores while being finer, and the number of the nucleation cores is greatly increased, so that the grain refining effect is increased; secondly, ultrasonic oscillation enables molten metal to generate phenomena of energy fluctuation and structure fluctuation, so that the front-edge component supercooling effect of the solidified liquid level is increased, and the grain refining effect is improved;
(3) the invention provides a casting method of a magnesium alloy sand mold, which adopts TiB2The powder and Zr are used as fining agent, which can increase the quantity of nucleation particles and the degree of supercooling of the alloy, and has the effect of coupled fining.
Drawings
FIG. 1 shows a schematic view of a flask in which the mounting position of an ultrasonic generator is reserved;
FIG. 2 shows an as-cast microstructure of Mg-8Gd-3Y cast magnesium alloy in example 1;
FIG. 3 shows an as-cast microstructure of Mg-8Gd-3Y cast magnesium alloy in comparative example 1;
FIG. 4 is a drawing showing a mirror image of a stretch-break of a magnesium alloy cast by clay sand + ultrasonic refining in comparative example 2;
FIG. 5 shows an elemental analysis spectrum of the labeled location of "spectrogram 7" in FIG. 4.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a magnesium alloy sand casting method, which comprises the following steps:
after the components of the magnesium alloy are proportioned according to a proportion, the components are sequentially added into a melting crucible to be melted from high to low according to the evaporation heat;
placing the mixture in a smelting furnace, starting an ultrasonic generator, and mixing TiB2Adding the powder and magnesium-zirconium (Mg-Zr) intermediate alloy into a magnesium alloy melt, and then refining, wherein ultrasonic waves are accompanied in the refining process; in the step, the action of an ultrasonic generator promotes the homogenization and the dispersion of the melt, and simultaneously breaks the agglomerated TiB in the melt2Powder, large-size and agglomerated Zr particles;
fishing out slag in the magnesium alloy melt after refining is finished, and standing the obtained molten metal;
designing an alloy casting sand mold according to a target alloy casting, and preparing the alloy casting sand mold by using resin sand;
installing a special sand box containing an ultrasonic generator outside the alloy casting sand mold;
setting parameters of an ultrasonic generator in a sand box, starting the generator, and pouring the obtained molten metal into a sand mold cavity; as shown in FIG. 1, when pouring, the mixture is pouredUsing special sand box containing ultrasonic generator to continuously break primary crystal and inhibit grain growth in the alloy solidification process, providing nucleation energy required by melt, increasing nucleation core quantity, and continuously dispersing agglomerated TiB2Powdering, crushing large-sized and agglomerated Zr particles, promoting TiB2And dissolving Zr to refine the crystal grains of the magnesium alloy;
and after the molten metal is filled and cooled, closing the ultrasonic generator, and dismantling the sand box and the sand mould to obtain the magnesium alloy casting.
In a preferred embodiment, before the alloy melting step, the melting crucible coated with the heat-resistant coating is placed in a melting furnace for preheating, and the preheating temperature is 700-730 ℃.
In a preferred embodiment, in the step of placing and starting the ultrasonic generator in the smelting furnace, the operating frequency of the ultrasonic generator is 40-60 KHz. The working frequency of the ultrasonic generator is lower than 40KHz and does not meet TiB2The powder is required to be dispersed and melted, the working frequency of the ultrasonic generator is higher than 60KHz, and the melt is easy to generate larger fluctuation and is not beneficial to flame retardance of the melt.
In a preferred embodiment, the TiB is2In the step of adding powder and magnesium-zirconium intermediate alloy into magnesium alloy melt, the TiB2The granularity of the powder is 1-3 mu m, the purity is more than or equal to 99.5 percent, the addition amount mass percent is 0.2-2.0 percent, and the addition amount mass percent of Zr is 0.2-2.5 percent.
The inventor finds that TiB2The grain size of the powder has an important influence on the grain refinement of the final magnesium alloy, and if the grain size of the powder is low and is lower than the minimum value of the above range, it is difficult to completely disperse the agglomerated TiB even in the presence of ultrasound2Powder; if the powder particle size is high and above the maximum of the above range, TiB2The powder has low meltability in metal solution and poor grain refining effect; in the invention, the granularity selection considers the dispersibility of the powder after agglomeration and the meltability of the powder particles by ultrasonic waves, and can effectively improve the grain refinement effect. According to related research, TiB2The particles are easy to precipitate and aggregate in the high-temperature melt, and generate a poisoning phenomenon on the Zr and other element alloys, so that the refiner is usedThe thinning effect is reduced, the invention passes through TiB2The selection of the particle size of the powder is matched with the action of multi-stage ultrasonic action, so that the poisoning effect is eliminated or reduced.
As Zr and Mg belong to a close-packed hexagonal structure, the lattice constant is close, and the Zr and the Mg can generate peritectic crystal, the magnesium alloy crystal grains are refined through the composition supercooling effect and the heterogeneous nucleation effect, and the grain refining effect is excellent. However, the contradiction between melt purification and alloy grain refinement existing in the use of Mg-Zr intermediate alloy as the magnesium alloy grain refiner is difficult to solve.
TiB2The crystal has a hexagonal structure of C32, a-0.30311 nm lattice constant, C-0.3229 nm lattice constant, 5.6% mismatch degree with alpha-Mg, and TiB2Can be used as a heterogeneous nucleation substrate of an a-Mg phase to promote heterogeneous nucleation of the magnesium alloy, so that the TiB2Has good grain refining potential. But in general TiB2The phenomenon of agglomeration exists in the magnesium liquid, and the TiB2 particles are loosely aggregated into a cluster, so that the TiB alone2Have limited effectiveness as a nucleation substrate.
Zr can reduce the melting and TiB2Wetting angle therebetween, while TiB2Considerable amount of Zr can be dissolved, so that the Ti2B is added at the same time in the invention2And Zr can promote the dissolution of the two in the magnesium alloy, so that the coupled refining effect is achieved, and the magnesium alloy refining level is finally improved. Furthermore, TiB2The powder and the Zr are jointly used as a refiner, the supercooling degree of the magnesium alloy can be increased, the diffusion speed of solute atoms is reduced along with the reduction of the temperature in a composition supercooling area, the growth rate of crystal grains is reduced, the refining effect is achieved, a few impurities in a melt are dissociated to the edge of a casting, and the defect of the central part of the casting is reduced.
In a preferred embodiment, in the step of designing an alloy casting sand mold according to a target alloy casting, resin sand is used for preparing the alloy casting sand mold, and sand stones in the resin sand are quartz sand or silica sand; the resin in the resin sand is at least one of furan resin, phenolic resin, phenol urethane resin or epoxy resin, preferably furan resin, and the addition amount of the resin in the resin sand is 0.5-2.5% of the weight of the resin sand; the curing agent in the resin sand is at least one of a sulfonic acid curing agent, dipropylenetriamine, an amidoamine curing agent or dicyandiamide, preferably the sulfonic acid curing agent, and the addition amount of the curing agent is 0.8-1.2% of the weight of the resin sand.
In a preferred embodiment, in the step of designing an alloy casting sand mold according to a target alloy casting, and preparing the alloy casting sand mold by using resin sand, the resin sand mold is prepared, brushed with a special flame retardant coating, kept stand for at least 24 hours and subjected to sand blowing treatment before use.
In a preferred embodiment, in the step of installing a special sand box containing an ultrasonic generator outside the alloy casting sand mold, the installation position of the ultrasonic generator is reserved in the sand box, and preferably, the installation density of the ultrasonic generator in the sand box is 4-8 ultrasonic generators/m3。
In a preferred embodiment, in the step of setting parameters of an ultrasonic generator in a sand box and starting the generator, and pouring the obtained molten metal into a sand mold cavity, the frequency of the ultrasonic generator is 20-30 KHz.
Examples
Example 1
The sand casting method of magnesium alloy Mg-8% Gd-3% Y comprises the following steps:
s1, coating heat-resistant paint on the cast iron crucible, and then placing the cast iron crucible in a resistance furnace for preheating, wherein the preheating temperature is 700 ℃;
s2, mixing the raw materials according to the mass percentage of the alloy components, and sequentially adding the raw materials into a crucible to be melted from high to low according to the evaporation heat;
s3, placing an ultrasonic generator in the smelting furnace and starting the generator, wherein the working frequency of the ultrasonic generator is 50KHz, and the TiB with the granularity of 1-3 mu m is added2Adding powder and magnesium-zirconium intermediate alloy as grain refiner into magnesium alloy melt, wherein the added TiB2The mass percent is 0.8%, and the mass percent of the added Zr in the total alloy is 2.0%;
s4, adding furan resin in 2.2% by weight of sand, and adding a sulfonic acid curing agent in 1.0% by weight of the sand, wherein the sand for sand casting in the resin sand is silica sand; the position of an ultrasonic generator in a special sand box is shown in figure 1, a required sand mold is prepared, and flame-retardant coating is brushed on the surface of the casting mold;
and S5, carrying out sand blowing treatment after the sand mould is kept stand for 24h, and ensuring that the sand mould has a complete structure and no shakeout on the surface.
S6, after the sand mold is placed at the designated pouring position, placing an ultrasonic generator in a special sand box, wherein the installation density of the ultrasonic generator in the sand box is 6/m3；
S7, fishing out the slag in the crucible, and standing the molten metal;
s8, setting the working frequency of an ultrasonic generator to be 25KHz, starting the ultrasonic generator, and pouring the obtained metal solution into a sand mold cavity by adopting a low-pressure casting mode;
and S9, after the molten metal is filled and cooled, closing the ultrasonic generator, and dismantling the sand box and the sand mold to obtain the magnesium alloy casting.
Through detection, as shown in fig. 2, in the embodiment, by adopting an ultrasonic refining method, when the cast magnesium alloy melt with the mass percentage of Mg-8% Gd-3% Y is cast at low pressure, the obtained magnesium alloy casting has fine grains and good mechanical properties, and the sampling of the casting body can stably reach the following steps: the grain size is less than 65 μm, and Rm is more than or equal to 205MPa at room temperature.
Example 2
The sand casting method of magnesium alloy Mg-12% Gd-0.2% Zn comprises the following steps:
s1, coating heat-resistant paint on the cast iron crucible, and then placing the cast iron crucible in a resistance furnace for preheating, wherein the preheating temperature is 720 ℃;
s2, mixing the raw materials according to the mass percentage of the alloy components, and sequentially adding the raw materials into a crucible to be melted from high to low according to the evaporation heat;
s3, placing an ultrasonic generator in the smelting furnace, starting the generator, wherein the working frequency of the ultrasonic generator is 45KHz, and the granularity of the TiB is 1-3 mu m2Adding powder and magnesium-zirconium intermediate alloy as grain refiner into magnesium alloy melt, wherein the added TiB2Quality ofThe percentage is 0.6 percent, and the added Zr accounts for 2.0 percent of the total alloy by mass;
s4, adding furan resin in 2.5% by weight of sand, and adding a sulfonic acid curing agent in 1.2% by weight of the sand, wherein the sand for sand casting in the resin sand is silica sand; the reserved position of an ultrasonic generator in a sand mold is shown in figure 1, the needed sand mold is prepared, and flame retardant coating is brushed on the surface of the casting mold;
and S5, carrying out sand blowing treatment after the sand mould is kept stand for 24h, and ensuring that the sand mould has a complete structure and no shakeout on the surface.
S6, after the sand mold is placed at the designated pouring position, setting and placing an ultrasonic generator at the special position of the sand box, wherein the installation density of the ultrasonic generator in the sand box is 8/m3；
S7, fishing out the slag in the crucible, and standing the molten metal;
s8, setting the working frequency of an ultrasonic generator to be 25KHz, starting the ultrasonic generator, and pouring the obtained metal solution into a sand mold cavity by adopting a differential pressure casting mode;
and S9, after the molten metal is filled and cooled, closing the ultrasonic generator, and dismantling the sand box and the sand mold to obtain the magnesium alloy casting.
Through detection, in the embodiment, by adopting an ultrasonic refining method, when the cast magnesium alloy melt with the mass percentage of Mg-12% Gd-0.2% Zn is subjected to differential pressure casting, the obtained magnesium alloy casting has fine grains and good mechanical properties, and the sampling of the casting body can stably reach the following steps: the grain size is less than 60 mu m, and Rm is more than or equal to 215MPa at room temperature.
Comparative example 1
Comparative example 1 is the same as the scheme of example 1, and is different only in that an ultrasonic refining method is not adopted in the smelting process and the sand mold pouring process.
Through detection, as shown in figure 3, the comparative example does not adopt an ultrasonic thinning method, and when the Mg-8% Gd-3% Y magnesium alloy melt is cast at low pressure, the size of the sampling crystal grain of the magnesium alloy casting body is larger than 80 μm, and Rm is less than or equal to 180MPa at room temperature. The size of the casting grain obtained without adopting the ultrasonic thinning method is larger than that of the casting grain obtained in the embodiment 1, and the mechanical property is lower than that of the casting grain obtained in the embodiment 1.
Comparative example 2
The comparative example 2 is the same as the embodiment 2, and is different from the embodiment in that clay sand is selected to prepare a casting sand mold, and an ultrasonic thinning method is adopted in the solidification process of the magnesium alloy.
As shown in fig. 4 and 5, in the present comparative example, the casting sand mold was prepared by using clay sand, and the sand mold shakeout was severe when ultrasonic refinement was used in the solidification process of the magnesium alloy; through detection, the sand inclusion ratio of the casting obtained after differential pressure casting exceeds 20%, and Rm of the magnesium alloy casting body at a sampling room temperature is less than or equal to 180 MPa.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A method for casting a magnesium alloy sand mold is characterized by comprising the following steps:
after the components of the magnesium alloy are proportioned according to a proportion, the components are sequentially added into a melting crucible to be melted from high to low according to the evaporation heat;
placing the mixture in a smelting furnace, starting an ultrasonic generator, and mixing TiB2Adding the powder and the Mg-Zr intermediate alloy into the magnesium alloy melt, and then refining, wherein ultrasonic treatment is carried out in the refining process;
fishing out slag in the magnesium alloy melt after refining is finished, and standing the obtained molten metal;
designing an alloy casting sand mold according to a target alloy casting, and preparing the alloy casting sand mold by using resin sand;
installing a sand box containing an ultrasonic generator outside the alloy casting sand mold;
setting parameters of an ultrasonic generator in a sand box, starting the generator, and pouring the obtained molten metal into a sand mold cavity;
and after the molten metal is filled and cooled, closing the ultrasonic generator, and dismantling the sand box and the sand mould to obtain the magnesium alloy casting.
2. The magnesium alloy sand mold casting method according to claim 1, wherein in the step of placing and starting the ultrasonic generator in the melting furnace, the operating frequency of the ultrasonic generator is 40 to 60 KHz.
3. The method of casting a magnesium alloy sand mold according to claim 1, wherein the step of forming TiB2In the step of adding powder and magnesium-zirconium intermediate alloy into magnesium alloy melt, the TiB2The granularity of the powder is 1-3 mu m, and the purity is more than or equal to 99.5 percent.
4. The method of casting a magnesium alloy sand mold according to claim 1, wherein the step of forming TiB2In the step of adding powder and magnesium-zirconium intermediate alloy into magnesium alloy melt, the TiB2The addition amount of the Zr is 0.2 to 2.5 percent by mass percent and the mass percent of the addition amount of the Zr is 0.2 to 2.0 percent.
5. The magnesium alloy sand casting method according to claim 1, wherein in the step of designing an alloy casting sand mold according to the target alloy casting, and preparing the alloy casting sand mold using resin sand, the sand in the resin sand is quartz sand or silica sand.
6. The magnesium alloy sand casting method according to claim 1, wherein in the step of designing an alloy casting sand mold according to the target alloy casting and preparing the alloy casting sand mold using resin sand, the resin in the resin sand is at least one of furan resin, phenolic resin, phenol urethane resin, or epoxy resin, and the amount added is 0.5 to 2.5% of the weight of the resin sand.
7. The method for casting a magnesium alloy sand according to claim 1, wherein in the step of designing an alloy casting sand mold according to a target alloy casting and preparing the alloy casting sand mold using resin sand, the curing agent in the resin sand is at least one of a sulfonic acid curing agent, dipropylenetriamine, an amidoamine curing agent, or dicyandiamide, and the amount of the curing agent added is 0.8 to 1.2% of the weight of the resin sand.
8. The magnesium alloy sand casting method according to claim 1, wherein in the step of designing an alloy casting sand mold according to a target alloy casting, and preparing the alloy casting sand mold by using resin sand, the resin sand mold is brushed with a flame retardant coating after preparation, is left for at least 24 hours, and is subjected to sand blowing treatment before use.
9. The method for casting the magnesium alloy sand mold according to claim 1, wherein in the step of installing the sand box containing the ultrasonic generator outside the alloy casting sand mold, an ultrasonic generator installation position is reserved inside the sand box.
10. The magnesium alloy sand mold casting method according to claim 1, wherein in the step of setting parameters of an ultrasonic generator in a sand box and starting the generator to pour the obtained molten metal into the sand mold cavity, the frequency of the ultrasonic generator is 20-30 KHz.
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