Molding sand and casting tool using same

Abstract

The invention discloses molding sand and a casting tool using the molding sand. The molding sand comprises the following raw materials in parts by mass: 70-80 parts of quartz sand; 5 to 10 parts of petroleum coke; 3 to 5 parts of mica; 3-5 parts of molybdenum disulfide; and 2-3 parts of white carbon black. Molybdenum disulfide, mica, white carbon black and petroleum coke are adopted for composite modification of quartz sand, the heat stability and air permeability of the quartz sand can be improved, the reliability of a high-temperature casting in the casting process is guaranteed, bubbles cannot be generated in the molding sand, the exterior is smooth, and appearance defects such as burrs are basically not generated.

Description

Technical Field

[0001] The present application relates to molding sand and a casting tool using the molding sand. Background Art

[0002] Casting is a metal heat heating process, which refers to the method of pouring liquid metal into a casting cavity that is adapted to the shape of the part, and then cooling and solidifying it to obtain a part or blank. The current casting methods mainly include ordinary sand casting and special casting. For the properties of the molding sand, it is mainly necessary to consider mechanical strength, thermal stability, air permeability, etc., so that after the molten metal enters the mold, the air can be quickly squeezed out and formed in the stable shape of the molding sand to complete the casting process. The existing molding sand cannot meet the requirements in terms of air permeability and thermal stability at the same time. In some casting environments, the surface properties and overall stability of the molding sand are prone to problems. Summary of the invention

[0003] In order to solve the above problems, the present application proposes a molding sand, comprising the following raw materials in parts by weight:

[0004] Quartz sand: 70-80 parts;

[0005] Petroleum coke: 5-10 parts;

[0006] Mica: 3-5 parts;

[0007] Molybdenum disulfide: 3-5 parts;

[0008] White carbon black: 2-3 parts. The present application adopts molybdenum disulfide, mica, white carbon black, petroleum coke composite modified quartz sand, which can improve the thermal stability and air permeability of the quartz sand itself, ensure the reliability of the high-temperature casting process during the casting process, and no bubbles will be generated inside the molding sand. The outside is smooth and basically does not produce surface defects such as burrs.

[0009] Preferably, quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon are sieved separately, and the sieve under the 100-mesh sieve is taken;

[0010] The sieve material is placed in a ball mill and ball-milled for 1-2 hours;

[0011] The polished product is calcined at a high temperature of 1000-1200°C for 0.5-1h;

[0012] The calcined product was placed in a ball mill for secondary ball milling for 1-2 hours;

[0013] The product after the secondary ball milling is passed through a 200-mesh sieve, and the material under the sieve is used as the final molding sand.

[0014] Preferably, after the second ball milling, if the overall mass of the sieve material exceeds 10wt%, the sieve material is further placed in the ball mill for ball milling for 0.5-1h, and then passed through a 200-mesh sieve, and the sieve material obtained this time and the sieve material of the previous time are taken as the final molding sand;

[0015] This process is repeated until the final 200-mesh sieve has a sieve-surface mass of less than 5wt%. The present invention ball-mills the raw materials, performs high-temperature roasting and secondary ball-milling to ensure the uniformity of the mixing of the components. Molybdenum disulfide can form a more compact structure with quartz sand through the composite effect of mica and petroleum coke, thereby ensuring the structural strength and stability.

[0016] On the other hand, a casting tool is also proposed, including a sand mold, a bottom support platform is arranged at the bottom of the sand mold, a top positioning platform is arranged at the top of the sand mold, and a plurality of connecting parts are arranged between the bottom support platform and the top positioning platform; an introduction channel is arranged at the top of the sand mold;

[0017] The sand mold is formed by sand stamping. The present application adopts a bottom support platform and a top positioning platform to form an overall fixed structure, fixes the sand mold therein, and uses an introduction channel to introduce molten metal to complete its molding in the sand mold, and finally achieves the purpose of casting molding, and the overall structural stability and safety are good.

[0018] Preferably, an introduction funnel is arranged at the top of the introduction channel; the introduction funnel is in the shape of a hollow, inverted frustum.

[0019] Preferably, the bottom support platform comprises a bottom support plate, on which a plurality of bottom hanging rings are arranged;

[0020] The top positioning platform comprises an annular plate arranged in an annular shape, a clamping plate is arranged on the outer side of the annular plate at a position corresponding to the bottom hanging ring, and at least one outward strip hole is arranged on the outward side of the clamping plate;

[0021] The connector includes a hook that is hooked with the bottom hook ring, a connecting rod is arranged on the hook, the connecting rod passes through the clamping plate through the outward bar hole, and a crimping force block is connected to the connecting rod above the clamping plate. The bottom of the connector of the present application adopts a hook for fixed hooking, and the top adopts a crimping force block composed of a locking nut, a rectangular plate, and a circular plate to obtain an overall crimping fixed structure. The fixed structure has good stability and locking effect, and will not be separated.

[0022] Preferably, the crimping force block includes a rectangular plate abutting against the clamping plate, a circular plate is arranged on the rectangular plate, the rectangular plate and the circular plate are sleeved on a connecting rod, and a threaded locking nut is arranged on the connecting rod above the circular plate; the rectangular plate and the circular plate are integrated.

[0023] Preferably, the molding sand mold comprises a plurality of stacked mold units; the mold unit comprises a lower mold and an upper mold matched with the lower mold, an upper pouring hole is arranged on the upper mold, and a lower outlet hole connected to the upper mold of the lower mold unit is arranged on the lower mold; the lower outlet hole at the bottom of the lower mold at the bottom layer is closed.

[0024] Preferably, side handles are provided on both sides of the upper mold and the lower mold respectively.

[0025] Preferably, an upper protruding rectangular frame is provided above the upper mold, and a lower protruding rectangular frame is provided below the lower mold. The upper protruding rectangular frame of the upper mold located at the top is abutted against the annular plate, and the lower protruding rectangular frame of the lower mold located at the bottom is supported by the bottom support plate; the upper protruding rectangular frame of the upper mold abutting against the lower protruding rectangular frame of the lower mold abuts against each other. The upper mold and the lower mold of the present application avoid structural failure by providing a rectangular frame as the mold force receiving part, thereby ensuring the reliability of the entire structure.

[0026] This application can bring the following beneficial effects:

[0027] 1. This application uses a composite modified quartz sand of molybdenum disulfide, mica, white carbon black, and petroleum coke, which can improve the thermal stability and air permeability of the quartz sand itself, ensure the reliability of the high-temperature casting process during the casting process, and no bubbles will be generated inside the molding sand. The outside is smooth and basically no surface defects such as burrs will be generated.

[0028] 2. The present application ball-mills, high-temperature roasts and performs secondary ball-milling on the raw materials to ensure the uniformity of mixing among the components. Molybdenum disulfide can form a tighter structural form with quartz sand through the composite effect of mica and petroleum coke, thereby ensuring structural strength and stability.

[0029] 3. The present application adopts a bottom supporting platform and a top positioning platform to form an overall fixed structure, fixes the sand mold therein, and uses an introduction channel to introduce molten metal, thereby completing its molding in the sand mold and ultimately achieving the purpose of casting. The overall structure has good stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of this application.

[0032] Figure 2 It is a side view schematic diagram of the present application. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of the present solution, the present application is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0034] For the molding sand part, the raw materials include the following mass parts:

[0035] Quartz sand: 70-80 parts;

[0036] Petroleum coke: 5-10 parts;

[0037] Mica: 3-5 parts;

[0038] Molybdenum disulfide: 3-5 parts;

[0039] White carbon black: 2-3 parts.

[0040] Quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon black are sieved respectively, and the sieve-through 100-mesh sieve is taken;

[0041] The sieve material is placed in a ball mill and ball-milled for 1-2 hours;

[0042] The polished product is calcined at a high temperature of 1000-1200°C for 0.5-1h;

[0043] The calcined product was placed in a ball mill for secondary ball milling for 1-2 hours;

[0044] The product after the secondary ball milling is passed through a 200-mesh sieve, and the material under the sieve is used as the final molding sand.

[0045] After the second ball milling, if the total mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 0.5-1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material from the previous time as the final molding sand;

[0046] This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

[0047] For casting tooling, such as Figure 1-2As shown, it includes a sand mold 1, a bottom supporting platform 2 is arranged at the bottom of the sand mold 1, a top positioning platform 3 is arranged at the top of the sand mold 1, and a plurality of connecting parts 4 are arranged between the bottom supporting platform 2 and the top positioning platform 3; an introduction channel 5 is arranged at the top of the sand mold 1; the sand mold 1 is formed by sand stamping.

[0048] An introduction funnel 6 is arranged at the top of the introduction channel 5; the introduction funnel 6 is in the shape of a hollow, inverted frustum. The bottom support platform 2 includes a bottom support plate 7, on which a plurality of bottom hanging rings 8 are arranged; the top positioning platform 3 includes an annular plate 9 arranged in an annular manner, on the outer side of the annular plate 9 corresponding to the position of the bottom hanging ring 8, a clamping plate 10 is arranged, and on the outward side of the clamping plate 10, at least one outward strip hole 11 is arranged. The connecting member 4 includes a hook 12 that is hooked with the bottom hanging ring 8, and a connecting rod 13 is arranged on the hook 12, and the connecting rod 13 is arranged through the outward strip hole 11 and passes through the clamping plate 10, and a crimping force block 14 is connected to the connecting rod 13 above the clamping plate 10. The crimping force block 14 includes a rectangular plate 15 that is abutted against the clamping plate 10, and a circular plate 16 is arranged on the rectangular plate 15. The rectangular plate 15 and the circular plate 16 are sleeved on the connecting rod 13, and a threaded locking nut 17 is arranged on the connecting rod 13 above the circular plate 16; the rectangular plate 15 and the circular plate 16 are arranged in an integrated manner.

[0049] The molding sand mold 1 includes a plurality of mold units 18 arranged in a stacked manner; the mold unit 18 includes a lower mold 19 and an upper mold 20 arranged in cooperation with the lower mold 19, an upper pouring hole 21 is arranged on the upper mold 20, and a lower outlet hole 22 of the upper mold 20 of the lower mold unit 18 is arranged on the lower mold 19; the lower outlet hole 22 at the bottom of the lower mold 19 at the bottom is closed. Side handles 23 are respectively arranged on both sides of the upper mold 20 and the lower mold 19. An upper protruding rectangular frame 24 is arranged above the upper mold 20, and a lower protruding rectangular frame 25 is arranged below the lower mold 19. The upper protruding rectangular frame 24 of the upper mold 20 located at the top is abutted against the annular plate 9, and the lower protruding rectangular frame 25 of the lower mold 19 located at the bottom is supported by the bottom support plate 7; the upper protruding rectangular frame 24 of the upper mold 20 and the lower protruding rectangular frame 25 of the lower mold 19 abutted against each other.

[0050] When in use, the sand mold 1 is placed on the bottom supporting platform 2, and the upper part is compacted by the top positioning platform 3. When in use, the lower protruding rectangular frame 25 of the lower mold 19 at the bottom abuts against the bottom supporting platform 2, and then accumulated, the upper protruding rectangular frame 24 of the upper mold 20 abuts against the top positioning platform 3, and then the bottom supporting platform 2 and the top positioning platform 3 are connected by the connecting piece 4, that is, the bottom hanging ring 8 is hung by the hanging hook 12, and the top is a crimping force block 14 composed of a locking nut, a rectangular plate 15, and a circular plate to obtain an overall crimping fixing structure; finally, the molten metal is introduced through the introduction channel, and the sand mold 1 can be used for casting.

[0051] In order to characterize the effectiveness of the present application, an experiment was conducted in the following manner to prove that the molding sand obtained by the method can have an effective treatment effect in spherical cast iron casting.

[0052] Embodiment 1:

[0053] S101. The quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon are sieved separately, and the sieve under the 100 mesh sieve is taken, wherein the mass fraction of quartz sand is 70 parts, the mass fraction of petroleum coke is 5 parts, the mass fraction of mica is 3 parts, the mass fraction of molybdenum disulfide is 3 parts and the mass fraction of white carbon is 2 parts;

[0054] S102. The mixed sieves are placed in a ball mill and ball-milled for 1 h;

[0055] S103. The polished product is placed in a muffle furnace for high-temperature calcination, the temperature is increased from room temperature at a rate of 5°C / min to a calcination temperature of 1000°C, and then calcined at the calcination temperature for 1h;

[0056] S104. The calcined product is placed in a ball mill for secondary ball milling for 1 h;

[0057] S105. Pass the product after the secondary ball milling through a 200-mesh sieve, and use the sieve-less material as the final molding sand.

[0058] S106. After the second ball milling and screening, if the overall mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 0.5-1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material obtained last time as the final molding sand;

[0059] This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

[0060] S107. The molding sand obtained in S106 is punched to obtain a molding sand mold, wherein the molding sand mold consists of two rectangular cavities, which are arranged opposite to each other, and the rectangular cavities form an internal cavity of 200mm*200mm*20mm. The casting is performed according to the operating method of the casting tool to obtain a No. 1 solid block of 200mm*200mm*20mm.

[0061] After casting, the number of external surface defects produced on the surface of the solid block is tested, and its tensile strength and elongation are tested.

[0062] The number of surface defects of solid block No. 1 is 3, the tensile strength is 850 MPa, and the elongation is 2.1%.

[0063] Embodiment 2:

[0064] S201. The quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon were sieved, and the sieve under the 100 mesh sieve was taken, wherein the mass fraction of quartz sand was 80 parts, the mass fraction of petroleum coke was 10 parts, the mass fraction of mica was 5 parts, the mass fraction of molybdenum disulfide was 5 parts and the mass fraction of white carbon was 3 parts;

[0065] S202. The mixed sieves are placed in a ball mill and ball-milled for 2 h;

[0066] S203. The polished product is placed in a muffle furnace for high-temperature calcination, the temperature is increased from room temperature at a rate of 5°C / min to a calcination temperature of 1200°C, and then calcined at the calcination temperature for 0.5h;

[0067] S204. The calcined product is placed in a ball mill for secondary ball milling for 2 h;

[0068] S205. Pass the product after the secondary ball milling through a 200-mesh sieve, and use the sieve-less material as the final molding sand.

[0069] S206. After the second ball milling and screening, if the overall mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material obtained last time as the final molding sand;

[0070] This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

[0071] S207. The molding sand obtained in S206 is punched to obtain a molding sand mold, wherein the molding sand mold consists of two rectangular cavities, which are arranged opposite to each other, and the rectangular cavities form an internal cavity of 200mm*200mm*20mm. The casting is performed according to the operating method of the casting tool to obtain a No. 2 solid block of 200mm*200mm*20mm.

[0072] After casting, the number of external surface defects produced on the surface of the solid block is tested, and its tensile strength and elongation are tested.

[0073] The number of surface defects of solid block No. 2 is 4, the tensile strength is 880 MPa, and the elongation is 2.4%.

[0074] Comparative Example 1:

[0075] S301. The quartz sand, petroleum coke, mica and white carbon black were sieved separately, and the sieve under the 100-mesh sieve was taken, wherein the mass fraction of quartz sand was 70 parts, the mass fraction of petroleum coke was 5 parts, the mass fraction of mica was 3 parts and the mass fraction of white carbon black was 2 parts;

[0076] S302. The mixed sieves are placed in a ball mill and ball-milled for 1 hour;

[0077] S303. The polished product is placed in a muffle furnace for high-temperature calcination, the temperature is raised from room temperature at a rate of 5°C / min to a calcination temperature of 1000°C, and then calcined at the calcination temperature for 1h;

[0078] S304. The calcined product is placed in a ball mill for secondary ball milling for 1 h;

[0079] S305. Pass the product after the secondary ball milling through a 200-mesh sieve, and use the sieve-less material as the final molding sand.

[0080] S306. After the second ball milling and screening, if the overall mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 0.5-1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material obtained last time as the final molding sand;

[0081] This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

[0082] S307. The molding sand obtained in S306 is punched to obtain a molding sand mold, wherein the molding sand mold consists of two rectangular cavities, which are arranged opposite to each other, and the rectangular cavities form an internal cavity of 200mm*200mm*20mm. The casting is performed according to the operating method of the casting tool to obtain a No. 3 solid block of 200mm*200mm*20mm.

[0083] After casting, the number of external surface defects produced on the surface of the solid block is tested, and its tensile strength and elongation are tested.

[0084] The number of surface defects of solid block No. 3 is 12, the tensile strength is 800 MPa, and the elongation is 1.8%.

[0085] Comparative Example 2:

[0086] S401. The quartz sand, mica, molybdenum disulfide and white carbon are sieved separately, and the sieve under the 100 mesh sieve is taken, wherein the mass fraction of quartz sand is 70 parts, the mass fraction of mica is 3 parts, the mass fraction of molybdenum disulfide is 3 parts and the mass fraction of white carbon is 2 parts;

[0087] S402. The mixed sieves are placed in a ball mill and ball-milled for 1 hour;

[0088] S403. The polished product is placed in a muffle furnace for high-temperature calcination, the temperature is raised from room temperature at a rate of 5°C / min to a calcination temperature of 1000°C, and then calcined at the calcination temperature for 1h;

[0089] S404. The calcined product is placed in a ball mill for secondary ball milling for 1 h;

[0090] S405. Pass the product after the secondary ball milling through a 200-mesh sieve, and use the sieve-less material as the final molding sand.

[0091] S406. After the second ball milling and screening, if the overall mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 0.5-1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material obtained last time as the final molding sand;

[0092] This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

[0093] S407. The molding sand obtained in S406 is punched to obtain a molding sand mold, wherein the molding sand mold consists of two rectangular cavities, which are arranged opposite to each other, and the rectangular cavities form an internal cavity of 200mm*200mm*20mm. The casting is performed according to the operating method of the casting tool to obtain a No. 4 solid block of 200mm*200mm*20mm.

[0094] After casting, the number of external surface defects produced on the surface of the solid block is tested, and its tensile strength and elongation are tested.

[0095] The number of surface defects of solid block No. 4 is 15, the tensile strength is 780 MPa, and the elongation is 1.9%.

[0096] Comparative Example 3:

[0097] S501. The quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon are sieved separately, and the sieve under the 200 mesh sieve is taken, wherein the mass fraction of quartz sand is 70 parts, the mass fraction of petroleum coke is 5 parts, the mass fraction of mica is 3 parts, the mass fraction of molybdenum disulfide is 3 parts and the mass fraction of white carbon is 2 parts;

[0098] S502. The molding sand obtained in S501 is punched to obtain a molding sand mold, wherein the molding sand mold consists of two rectangular cavities, the two rectangular cavities are arranged opposite to each other, and the rectangular cavities form an internal cavity of 200mm*200mm*20mm. The casting is performed according to the operating method of the casting tool to obtain a No. 5 solid block of 200mm*200mm*20mm.

[0099] After casting, the number of external surface defects produced on the surface of the solid block is tested, and its tensile strength and elongation are tested.

[0100] The number of surface defects of solid block No. 5 is 23, the tensile strength is 770 MPa, and the elongation is 1.7%.

[0101] Comparative Example 4:

[0102] S601. The quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon are sieved separately, and the sieve under the 100 mesh sieve is taken, wherein the mass fraction of quartz sand is 70 parts, the mass fraction of petroleum coke is 5 parts, the mass fraction of mica is 3 parts, the mass fraction of molybdenum disulfide is 3 parts and the mass fraction of white carbon is 2 parts;

[0103] S602. Stir and mix the sieve material;

[0104] S603. The mixed product is placed in a muffle furnace for high-temperature calcination, the temperature is increased from room temperature at a rate of 5°C / min to a calcination temperature of 1000°C, and then calcined at the calcination temperature for 1h;

[0105] S604. The calcined product is placed in a ball mill for ball milling for 1 h;

[0106] S605. The ball-milled product is passed through a 200-mesh sieve, and the sieve-less material is used as the final molding sand.

[0107] S606. After ball milling and sieving, if the total mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 0.5-1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material obtained last time as the final molding sand;

[0108] This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

[0109] S607. The molding sand obtained in S606 is punched to obtain a molding sand mold, wherein the molding sand mold consists of two rectangular cavities, which are arranged opposite to each other, and the rectangular cavities form an internal cavity of 200mm*200mm*20mm. The casting is performed according to the operating method of the casting tool to obtain a No. 6 solid block of 200mm*200mm*20mm.

[0110] After casting, the number of external surface defects produced on the surface of the solid block is tested, and its tensile strength and elongation are tested.

[0111] The number of surface defects of solid block No. 6 is 17, the tensile strength is 775 MPa, and the elongation is 1.8%.

[0112] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A molding sand, characterized in that: Including the following raw materials by mass: Quartz sand: 70-80 parts; Petroleum coke: 5-10 parts; Mica: 3-5 parts; Molybdenum disulfide: 3-5 parts; White carbon black: 2-3 parts.

2. A molding sand as claimed in claim 1, characterized in that: Quartz sand, petroleum coke, mica, molybdenum disulfide and white carbon black are sieved respectively, and the sieve-through 100-mesh sieve is taken; The sieve material is placed in a ball mill and ball-milled for 1-2 hours; The polished product is calcined at a high temperature of 1000-1200°C for 0.5-1h; The calcined product was placed in a ball mill for secondary ball milling for 1-2 hours; The product after the secondary ball milling is passed through a 200-mesh sieve, and the material under the sieve is used as the final molding sand.

3. A molding sand as claimed in claim 2, characterized in that: After the second ball milling, if the total mass of the sieve material exceeds 10wt%, continue to place it in the ball mill for 0.5-1h, then pass it through a 200-mesh sieve, and take the sieve material obtained this time and the sieve material from the previous time as the final molding sand; This process is repeated until the final 200-mesh sieve oversize accounts for less than 5 wt% of the total mass.

4. A casting tool using the molding sand according to any one of claims 1 to 3, characterized in that: The invention comprises a sand molding mold, a bottom supporting platform is arranged at the bottom of the sand molding mold, a top positioning platform is arranged at the top of the sand molding mold, a plurality of connecting parts are arranged between the bottom supporting platform and the top positioning platform; an introduction channel is arranged at the top of the sand molding mold; The molding sand mold is formed by molding sand by stamping and pressing.

5. A casting tool as claimed in claim 4, characterized in that: An introduction funnel is arranged on the top of the introduction channel; the introduction funnel is in the shape of a hollow, inverted frustum.

6. A casting tool as claimed in claim 4, characterized in that: The bottom support platform comprises a bottom support plate, on which a plurality of bottom hanging rings are arranged; The top positioning platform comprises an annular plate arranged in an annular shape, a clamping plate is arranged on the outer side of the annular plate at a position corresponding to the bottom hanging ring, and at least one outward strip hole is arranged on the outward side of the clamping plate; The connecting piece includes a hook connected to the bottom hanging ring, a connecting rod is arranged on the hook, the connecting rod passes through the clamping plate through the outward strip hole, and a crimping force block is connected to the connecting rod above the clamping plate.

7. A casting tool as claimed in claim 6, characterized in that: The crimping force block includes a rectangular plate that is abutted against the clamping plate, a circular plate is arranged on the rectangular plate, the rectangular plate and the circular plate are sleeved on a connecting rod, and a threaded locking nut is arranged on the connecting rod above the circular plate; the rectangular plate and the circular plate are integrated.

8. A casting tool as claimed in claim 6, characterized in that: The molding sand mold comprises a plurality of stacked mold units; the mold unit comprises a lower mold and an upper mold matched with the lower mold, an upper pouring hole is arranged on the upper mold, and a lower outlet hole connected to the upper mold of the lower mold unit is arranged on the lower mold; the lower outlet hole at the bottom of the lower mold at the bottom layer is closed.

9. A casting tool as claimed in claim 8, characterized in that: Side handles are respectively arranged on both sides of the upper mold and the lower mold.

10. A casting tool as claimed in claim 8, characterized in that: An upper protruding rectangular frame is arranged above the upper mold, and a lower protruding rectangular frame is arranged below the lower mold. The upper protruding rectangular frame of the upper mold located at the top is abutted against the annular plate, and the lower protruding rectangular frame of the lower mold located at the bottom is supported by the bottom support plate; the upper protruding rectangular frame of the upper mold and the lower protruding rectangular frame of the lower mold abutting up and down are abutted against each other.

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