Sand core mold and casting mold for preparing the sand core mold

Abstract

The present invention is applicable to the technical field of mold equipment, and provides a sand core mold and a casting mold for preparing the sand core mold. The sand core mold includes a base, a pouring port and a molding groove respectively opened on the base; the casting mold includes a support frame, a fixed mold installed on the support frame, a movable mold enclosed with the fixed mold to form a cavity for preparing the above-mentioned sand core mold, and a pouring assembly installed on the movable mold. The present invention can prepare a sand core mold through a casting mold, and then prepare a salt core through the sand core mold. Compared with the traditional method of sand core molding to prepare a casting oil channel or water channel, the room temperature flexural strength range of the salt core is 12Mpa-30Mpa. Therefore, when the salt core is molded to prepare a casting oil channel or water channel, the salt core has a small loss when the slender molding core is broken; the casting molded by the salt core only needs to use water to flush the salt core, the salt core can be dissolved in water, there is no salt residue in the casting, and the product quality is high; the sand removal process step is eliminated, and the operation is convenient and fast.

Description

Technical Field

[0001] The invention belongs to the technical field of mold equipment, and more specifically, relates to a sand core mold and a casting mold for preparing the sand core mold. Background Art

[0002] The salt core is formed by cooling a salt solution. The salt core has many advantages such as being soluble in water and not easily remaining in oil or water channels. It is the first choice for preparing oil or water channels for castings.

[0003] However, in the casting process of aluminum alloy parts, sand core molding is often used to prepare the oil channel or water channel of the casting. However, the room temperature flexural strength of the sand core is only in the range of 3Mpa-8Mpa, which makes the slender sand core easy to break and lose; moreover, sand is easy to remain in the oil channel or water channel of the casting. Due to the high rigidity of the sand particles, it is easy to fall off the casting and flow into the oil channel or water channel, and the sand particles will cause great wear on the moving parts, affecting the product quality; if necessary, sand blasting operation is required to remove the sticky sand, so the sand removal process is demanding and the operation is complicated. Summary of the invention

[0004] An object of the present invention is to provide a sand core mold to solve the problems in the prior art of large breakage loss of the sand core and easy generation of sand residue in the oil channel or water channel when the sand core is used to prepare the oil channel or water channel of the casting.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a sand core mold, comprising:

[0006] Pedestal;

[0007] A boss, mounted on the base;

[0008] A pouring port is provided on the boss and is used for injecting salt solution;

[0009] A forming groove is provided on the boss and communicated with the pouring port, and is used for the salt solution injected from the pouring port to flow in and be cooled and formed into a salt core;

[0010] Cooling channels are respectively arranged through the base and the boss, and are used to cool the salt solution in the molding tank.

[0011] Furthermore, the cooling channel has a liquid inlet and a liquid outlet, the liquid inlet is opened on the base, the liquid outlet is opened on the boss, and the number of the liquid inlets is less than the number of the liquid outlets, and the diameter of the liquid inlet is greater than the diameter of the liquid outlet.

[0012] Another object of the present invention is to provide a casting mold for preparing the above-mentioned sand core mold, comprising:

[0013] Support frame;

[0014] A fixed mold, mounted on the support frame;

[0015] A movable mold, which, together with the fixed mold, forms a cavity for preparing the sand core mold;

[0016] A pouring assembly is installed on the movable mold and is used for injecting sand into the mold cavity.

[0017] Furthermore, the fixed mold includes a lower mold core and lower fixed plates supporting both ends of the lower mold core, and each of the lower fixed plates is installed on the support frame; the movable mold includes an upper mold core that cooperates with the lower mold core to form the cavity and an upper fixed plate supporting both ends of the upper mold core, and the casting assembly is installed in the upper mold core.

[0018] Furthermore, a plurality of upper positioning blocks are installed on the upper die core, and a corresponding lower positioning block is installed on the lower die core for positioning in cooperation with each of the upper positioning blocks.

[0019] Furthermore, the fixed mold also includes a plurality of lower ejector rods installed on the lower mold core and a lower support plate supporting each of the lower ejector rods; one end of each of the lower ejector rods passes through the lower mold core and extends into the cavity, and the lower support plate is installed between the two lower fixed plates.

[0020] Furthermore, the movable mold also includes a plurality of upper ejector rods installed on the upper mold core and an upper support plate supporting each of the upper ejector rods; one end of each of the upper ejector rods passes through the upper mold core and extends into the cavity, and the upper support plate is installed between the two upper fixed plates.

[0021] Furthermore, the movable mold also includes a guide rod with one end mounted on the upper support plate and the other end extending into the upper mold core, and a spring sleeved on the guide rod, wherein the spring is located between the upper support plate and the upper mold core.

[0022] Furthermore, an upper limit block is installed on the side of the upper support plate facing the lower support plate, and a lower limit block cooperating with the upper limit block for limiting position is correspondingly installed on the lower support plate.

[0023] Furthermore, the movable mold also includes a plurality of upper stops for resisting the upper support plate, and the plurality of upper stops are divided into two groups, and each group of upper stops is installed on the corresponding upper fixed plate; the fixed mold also includes a plurality of lower stops for resisting the lower support plate, and the plurality of lower stops are divided into two groups, and each group of lower stops is installed on the corresponding lower fixed plate.

[0024] The beneficial effects of the sand core mold and the casting mold for preparing the sand core mold provided by the present invention are: compared with the prior art, the present invention can prepare a sand core mold through a casting mold, and then prepare a salt core through the sand core mold. Compared with the traditional method of sand core molding to prepare oil channels or water channels of castings, the room temperature flexural strength range of the salt core prepared by the sand core mold is 12Mpa-30Mpa. Therefore, when the oil channels or water channels of castings are prepared by salt core molding, the fracture loss of the salt core is small in the slender molding core; moreover, the casting formed by the salt core only needs to use water to flush away the salt core, the salt core can be dissolved in water, there is no salt residue in the casting, and the product quality is high; the sand removal process step is eliminated, and the operation is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a sand core mold provided by an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a casting mold for preparing a sand core mold provided by an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Explosion diagram of

[0029] Figure 4 An exploded schematic diagram of a movable mold provided by an embodiment of the present invention;

[0030] Figure 5 An exploded schematic diagram of a fixed mold provided by an embodiment of the present invention;

[0031] Figure 6 A schematic structural diagram of a support frame provided in an embodiment of the present invention.

[0032] Among them, the reference numerals in the figure are:

[0033] 1-sand core mold; 11-base; 12-pouring port; 13-molding groove; 14-boss; 15-cooling channel; 151-liquid inlet; 152-liquid outlet; 16-positioning column; 17-step portion; 18-drainage groove;

[0034] 2-fixed mold; 21-lower mold core; 210-installation groove; 211-lower positioning block; 212-convex portion; 22-lower fixing plate; 23-lower ejector rod; 24-lower support plate; 25-lower limit block; 26-lower stop block; 27-positioning strip;

[0035] 3-movable mold; 31-upper mold core; 310-accommodating groove; 311-upper positioning block; 312-recess; 32-upper fixing plate; 33-upper ejector rod; 34-upper support plate; 35-guide rod; 36-spring; 37-upper limit block; 38-upper stop block;

[0036] 4-support frame; 41-guide plate; 411-first section; 412-second section. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Please also read Figure 1 , the sand core mold provided by the embodiment of the present invention is now described. The sand core mold 1 includes a base 11, a boss 14 installed on the base 11, a pouring port 12 and a molding groove 13 opened on the boss 14, and the molding groove 13 is connected with the pouring port 12; it also includes a cooling channel 15 for cooling the salt solution in the molding groove 13, and the cooling channel 15 is respectively set through the base 11 and the boss 14. When the salt solution is poured into the pouring port 12, the salt solution fills the entire molding groove 13 along the trajectory of the molding groove 13. After the salt solution is cooled, the formed salt core is taken out from the sand core mold 1, and the salt core can be used to prepare the oil channel or water channel of the aluminum alloy component casting.

[0043] Optionally, the cross section of the molding groove 13 is consistent with the cross section of the salt core. In this structure, when the salt solution fills the entire molding groove 13, the salt solution in the molding groove 13 forms a salt core after condensation. Therefore, the shape, size, structure, etc. of the salt core correspond to the molding groove 13 to ensure that the salt core made by the sand core mold 1 meets the standard. Of course, the size, structure, etc. of the salt core and the molding groove 13 can be adjusted according to actual needs, and are not limited here.

[0044] Optionally, a plurality of positioning posts 16 are provided on the same side of the base 11 of the sand core mold 1 to facilitate accurate processing and molding of the sand core mold 1. The number of the positioning posts 16 can be three, which is not limited here.

[0045] Please also refer to Figure 1As a specific implementation of the sand core mold provided by an embodiment of the present invention, the cooling channel 15 has a liquid inlet 151 and a liquid outlet 152. The liquid inlet 151 is opened on the base 11, and the liquid outlet 152 is opened on the boss 14. The number of the liquid inlets 151 is less than the number of the liquid outlets 152, and the diameter of the liquid inlet 151 is greater than the diameter of the liquid outlet 152. In this structure, cooling water can be injected into the cooling channel 15, and the cooling water enters the cooling channel 15 from the low-positioned liquid inlet 151. The cooling water flows into the cooling channel 15 set in the boss 14, and the salt solution in the molding groove 13 can be cooled and molded. The cooling water is then discharged through a plurality of liquid outlets 152. The diameter of the liquid inlet 151 is larger than the diameter of the liquid outlet 152, which can achieve wide in and narrow out, thereby improving the cooling efficiency of the molding groove 13.

[0046] Optionally, the length of the cooling channel in the boss 14 is greater than the length of the cooling channel in the base 11, which can effectively extend the cooling length of the molding groove 13. The number of the liquid inlet 151 can be one, and the liquid outlet 152 can be provided on the four sides of the boss 14 to improve the circulation efficiency of the cooling water, which is not limited here.

[0047] Optionally, a step portion 17 is formed between the boss 14 and the base 11, and a circle of drainage grooves 18 are provided on the step portion 17. The drainage grooves 18 can store cooling water discharged from a plurality of liquid outlets 152. A drainage port (not shown) connected to the drainage grooves 18 is provided on the base 11, and the cooling water is discharged and collected through the drainage port for reuse.

[0048] Please also read Figures 2 to 6 , the casting mold for preparing the sand core mold provided by the embodiment of the present invention is now described. The casting mold includes a support frame 4, a fixed mold 2 installed on the support frame 4, a movable mold 3 which encloses a cavity for preparing the above-mentioned sand core mold 1 with the fixed mold 2, and a casting assembly (not shown) installed on the movable mold 3 and used to inject sand into the cavity. The size of the cavity formed by the fixed mold 2 and the movable mold 3 is adapted to the size of the sand core mold 1, and the cavity has inserts that respectively form the pouring port 12, the molding groove 13, the positioning column 16 and the cooling channel 15 in the sand core mold. With this structure, when sand is injected into the cavity enclosed by the fixed mold 2 and the movable mold 3 through the casting assembly, the sand in the cavity is solidified and formed to form the above-mentioned sand core mold 1.

[0049] When the salt core is used as an oil channel or water channel for casting aluminum alloy parts, the operation process is as follows:

[0050] S1, preparing a sand core mold 1 by using the above casting mold;

[0051] S2, preparing a salt core by using a sand core mold 1;

[0052] S3. Prepare aluminum alloy parts by combining an aluminum alloy part casting mold with a salt core.

[0053] Among them, in step S1, the specific steps are as follows:

[0054] S11, closing the fixed mold 2 and the movable mold 3, and heating the cavity enclosed by the fixed mold 2 and the movable mold 3 to 220°C-280°C.

[0055] S12, injecting sand into the mold cavity through the pouring assembly. Optionally, to improve the efficiency of sand injection, a core shooter can be used to inject sand into the mold cavity. The pressure of the core shooter can be 0.4 MPa, and the core shooter can inject sand for about 3 seconds.

[0056] S13, flipping the casting mold to implement the sand vibration operation, so that the sand completely fills the mold cavity, and the sand filled in each part of the mold cavity is uniform, thereby ensuring the quality of the sand core mold 1. Optionally, the time for flipping the casting mold is about 10 seconds.

[0057] S14, solidification and molding. After the cavity is filled with sand, it is solidified and molded, and the solidification time is about 10 seconds.

[0058] S15, opening the fixed mold 2 and the movable mold 3, and ejecting the solidified sand core mold 1.

[0059] Among them, in step S2, the specific steps are as follows:

[0060] S21. Mix the salt containing Na, K and Mg in a certain proportion to form a salt solution, and melt it at high temperature in a crucible furnace, and the melting temperature is controlled at 780°C-900°C. Optionally, the Na ions in the salt solution are provided by sodium chloride (chemical formula NaCl) and sodium carbonate (chemical formula Na2CO3); the K ions in the salt solution are provided by potassium chloride (chemical formula KCl); and the Mg ions in the salt solution are provided by magnesium chloride (chemical formula MgCl). In the salt solution, the content of sodium chloride is 70%, the content of sodium carbonate is 10%, the content of potassium chloride is 5%-10%, and the content of magnesium chloride is 2.5%. After stirring and mixing with water, a salt solution is formed. In other embodiments, the salt solution may also be composed of other components, and the proportional relationship between the components may also be adjusted according to actual needs, and is not limited here.

[0061] S22, pouring the high-temperature salt solution into the molding groove 13 through the pouring port 12 of the sand core mold 1 with the help of external equipment. This process lasts for about 10 seconds.

[0062] S23, the salt solution in the forming tank 13 is taken out after solidification to form a salt core, and after grinding and trimming, it is packed and stored in a moisture-proof box. The solidification duration of the salt solution is about 30s-50s.

[0063] Among them, in step S3, the specific steps are as follows:

[0064] S31, opening a casting mold for an aluminum alloy component, placing a salt core into a mold cavity of the casting mold, and then closing the mold.

[0065] S32, injecting salt solution into the mold cavity, and after cooling and solidification, opening the mold to eject the aluminum alloy casting.

[0066] S33. Shatter the salt core in the aluminum alloy casting to accelerate the melting of the salt core.

[0067] S34, using high-pressure clean water to melt and remove the salt core in the aluminum alloy casting, wherein the temperature range of the clean water is 50°C-60°C, and the pressure range of the flushing water is 0.2Mpa-0.6Mpa, which is not limited here.

[0068] The sand core mold and the casting mold for preparing the sand core mold provided in the embodiments of the present invention, compared with the prior art, the present invention can prepare the sand core mold 1 through the casting mold, and then prepare the salt core through the sand core mold 1. Compared with the traditional method of forming the sand core to prepare the oil channel or water channel of the casting, the room temperature flexural strength range of the salt core is 12Mpa-30Mpa. Therefore, when the salt core is formed to prepare the oil channel or water channel of the casting, the salt core has little loss when the slender formed core breaks; moreover, the casting formed by the salt core only needs to use water to flush away the salt core, the salt core can be dissolved in water, there is no salt residue in the casting, and the product quality is high; the sand removal process step is eliminated, and the operation is convenient and quick.

[0069] The present invention uses salt core molding to prepare oil channels or water channels of aluminum alloy parts, which has the advantages of high strength, high workmanship, and high quality. It can achieve high efficiency and high quality of oil channels or water channels of aluminum alloy castings, and meet the high requirements of precision components such as gearboxes for high precision, high cleanliness, etc.

[0070] Please also refer to Figure 3 As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, the fixed mold 2 includes a lower mold core 21 and lower fixed plates 22 supporting the two ends of the lower mold core 21, and each lower fixed plate 22 is installed on the support frame 4; the movable mold 3 includes an upper mold core 31 that cooperates with the lower mold core 21 to form a cavity and an upper fixed plate 32 that supports the two ends of the upper mold core 31, and the casting assembly is installed in the upper mold core 31. In this structure, the lower mold core 21 can be effectively supported and fixed by the lower fixed plate 22, and the upper mold core 31 can be effectively supported and fixed by the upper fixed plate 32, so that the fixed mold 2 and the movable mold 3 can be effectively opened and closed with high precision. Optionally, the casting mold also includes a cooling component for cooling the cavity to improve the cooling rate of the aluminum alloy casting.

[0071] Optionally, please also refer to Figure 6A plurality of guide plates 41 are arranged on the bottom surface of the support frame 4, and each guide plate 41 includes a first section 411 arranged vertically and a second section 412 extending outwardly at a free end of the first section 411 in a direction inclined to the first section 411. The space enclosed by each first section 411 can effectively position and support the two lower fixing plates 22, and each inclined second section 412 can allow the two lower fixing plates 22 to extend into the space enclosed by each first section 411, playing a certain role in limiting and guiding.

[0072] Please also refer to Figures 3 to 5 As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, a plurality of upper positioning blocks 311 are installed on the upper mold core 31, and a corresponding lower positioning block 211 cooperating with each upper positioning block 311 is installed on the lower mold core 21. This structure can improve the alignment accuracy of the opening and closing of the upper mold core 31 and the lower mold core 21 through the cooperating positioning of each upper positioning block 311 with the corresponding lower positioning block 211, thereby improving the accuracy of the casting mold. Optionally, a plurality of accommodating grooves 310 for accommodating each upper positioning block 311 are provided along the periphery of the upper mold core 31, and each upper positioning block 311 is provided with a concave portion 312 with an opening facing downward; a plurality of installation grooves 210 for accommodating each lower positioning block 211 are correspondingly provided on the periphery of the lower mold core 21, and each lower positioning block 211 is provided with a convex portion 212 extending into the concave portion 312 of the corresponding upper positioning block 311. By aligning and cooperating each convex portion 212 with the corresponding concave portion 312 , the alignment accuracy of the upper mold core 31 and the lower mold core 21 is improved.

[0073] Please also refer to Figure 5 As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, the fixed mold 2 also includes a plurality of lower ejector pins 23 installed on the lower mold core 21 and a lower support plate 24 supporting each lower ejector pin 23; one end of each lower ejector pin 23 is installed on the lower support plate 24, and the other end of each lower ejector pin 23 extends into the lower mold core 21, and the lower support plate 24 is installed between the two lower fixed plates 22. In this structure, by extending a plurality of lower ejector pins 23 into the mold cavity, the position and length of each lower ejector pin 23 can be adjusted according to the configuration of the prepared aluminum alloy component casting, so as to meet the size requirements of different aluminum alloy component castings when pouring and filling the mold cavity.

[0074] Please also refer to Figure 4As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, the movable mold 3 also includes a plurality of upper ejector pins 33 installed on the upper mold core 31 and an upper support plate 34 supporting each upper ejector pin 33; one end of each upper ejector pin 33 is installed on the upper support plate 34, and the other end of each upper ejector pin 33 extends into the upper mold core 31, and the upper support plate 34 is installed between two upper fixed plates 32. In this structure, by extending a plurality of upper ejector pins 33 into the mold cavity, the position and length of each upper ejector pin 33 can be adjusted according to the configuration of the prepared aluminum alloy component casting, so as to meet the size requirements of different aluminum alloy component castings when the mold cavity is poured and filled; moreover, after the fixed mold 2 and the movable mold 3 are opened, each upper ejector pin 33 can eject the aluminum alloy component casting in the mold cavity.

[0075] Please also refer to Figure 4 As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, the movable mold 3 also includes a guide rod 35 with one end mounted on the upper support plate 34 and the other end extending into the upper mold core 31, and a spring 36 sleeved on the guide rod 35, and the spring 36 is located between the upper support plate 34 and the upper mold core 31. In this structure, when each upper ejector rod 33 ejects the aluminum alloy component casting, the guide rod 35 can play a certain positioning and guiding role, and the spring 36 can play a certain buffering protection and reset role.

[0076] Please also refer to Figure 3 As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, an upper limit block 37 is installed on the side of the upper support plate 34 facing the lower support plate 24, and a lower limit block 25 is correspondingly installed on the lower support plate 24 to cooperate with the upper limit block 37. Through the cooperation between the upper limit block 37 and the lower limit block 25, the alignment accuracy between the movable mold 3 and the fixed mold 2 can be improved, and a certain limiting effect can also be played, thereby improving the reliability of the opening and closing of the casting mold.

[0077] Optionally, a plurality of positioning strips 27 are arranged at intervals on the outer surface of the lower limit block 25, and a plurality of positioning strips 27 are also arranged at intervals on the outer surface of the lower mold core 21. The plurality of positioning strips 27 enclose and form an accommodating space for accommodating the upper mold core 31 and the upper limit plate, and each positioning strip 27 can also play a certain positioning role.

[0078] Please also refer to Figure 4 and Figure 5As a specific implementation of the casting mold for preparing the sand core mold provided by the embodiment of the present invention, the movable mold 3 also includes a plurality of upper blocks 38 for resisting the upper support plate 34, the plurality of upper blocks 38 are divided into two groups, and each group of upper blocks 38 is installed on the corresponding upper fixed plate 32; the fixed mold 2 also includes a plurality of lower blocks 26 for resisting the lower support plate 24, the plurality of lower blocks 26 are divided into two groups, and each group of lower blocks 26 is installed on the corresponding lower fixed plate 22. In this structure, when the upper support plate 34 drives the upper push rods 33 to reset, the upper blocks 38 can resist the upper support plate 34 to prevent the upper support plate 34 from exceeding the stroke; similarly, when the lower support plate 24 drives the lower push rods 23 to reset, the lower blocks 26 can resist the lower support plate 24 to prevent the lower support plate 24 from exceeding the stroke.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A casting mold for preparing a sand core mold, characterized in that: include: Support frame; A fixed mold, mounted on the support frame; A movable mold, which, together with the fixed mold, forms a cavity for preparing a sand core mold; A pouring assembly, mounted on the movable mold, for injecting sand into the mold cavity; The fixed mold includes a lower mold core and lower fixed plates supporting the two ends of the lower mold core, and each of the lower fixed plates is installed on the support frame; the movable mold includes an upper mold core that cooperates with the lower mold core to form the cavity and an upper fixed plate supporting the two ends of the upper mold core, and the casting assembly is installed in the upper mold core; The fixed die also includes a plurality of lower ejector rods mounted on the lower die core and a lower support plate supporting each of the lower ejector rods; The movable mold further comprises a plurality of upper ejector rods mounted on the upper mold core and an upper support plate supporting each of the upper ejector rods; one end of each of the upper ejector rods passes through the upper mold core and extends into the mold cavity, and the upper support plate is mounted between the two upper fixed plates; An upper limit block is installed on the side of the upper support plate facing the lower support plate, and a lower limit block is correspondingly installed on the lower support plate to cooperate with the upper limit block; wherein, a plurality of positioning strips are arranged at intervals on the outer surface of the lower limit block, and a plurality of positioning strips are also arranged at intervals on the outer surface of the lower mold core, and a plurality of positioning strips are enclosed to form an accommodating space for accommodating the upper mold core and the upper limit plate; The movable mold further comprises a plurality of upper stoppers for resisting the upper support plate, the plurality of upper stoppers are divided into two groups, and each group of upper stoppers is mounted on the corresponding upper fixed plate; the fixed mold further comprises a plurality of lower stoppers for resisting the lower support plate, the plurality of lower stoppers are divided into two groups, and each group of lower stoppers is mounted on the corresponding lower fixed plate; Wherein, the sand core mold comprises: A base; wherein a plurality of positioning columns are arranged on the same side of the base; A boss, mounted on the base; A pouring port is provided on the boss and is used for injecting salt solution; A forming groove is provided on the boss and communicated with the pouring port, and is used for the salt solution injected from the pouring port to flow in and be cooled and formed into a salt core; A cooling channel is respectively provided through the base and the boss, and is used to cool the salt solution in the molding tank; The cooling channel has a liquid inlet and a liquid outlet, the liquid inlet is opened on the base, and the liquid outlet is opened on the boss, the number of the liquid inlets is less than the number of the liquid outlets, and the diameter of the liquid inlet is larger than the diameter of the liquid outlet; a step portion is formed between the boss and the base, a drainage groove for storing the coolant discharged from the liquid outlet is opened on the step portion, a drainage outlet connected to the drainage groove is opened on the base, and the length of the cooling channel in the boss is larger than the length of the cooling channel in the base; wherein the number of the liquid inlet is one, and liquid outlets are arranged on the four sides of the boss.

2. The casting mold for preparing a sand core mold according to claim 1, characterized in that: A plurality of upper positioning blocks are installed on the upper die core, and a lower positioning block which cooperates with each of the upper positioning blocks for positioning is correspondingly installed on the lower die core.

3. The casting mold for preparing a sand core mold according to claim 1, characterized in that: One end of each lower ejector rod passes through the lower mold core and extends into the mold cavity, and the lower support plate is installed between the two lower fixing plates.

4. The casting mold for preparing a sand core mold according to claim 1, characterized in that: The movable mold also includes a guide rod with one end mounted on the upper support plate and the other end extending into the upper mold core, and a spring sleeved on the guide rod, wherein the spring is located between the upper support plate and the upper mold core.

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