Sand core structure for casting through hole of casting

Abstract

The utility model discloses a sand core structure for casting a casting through hole, which belongs to the technical field of casting processing, and is technically characterized by comprising a first casting box and a second casting box arranged above the first casting box, and the first casting box is connected with the second casting box through bolts; the flowing path of a metal solution is prolonged through the design of the snakelike groove, the flowing speed is remarkably reduced, the gas entrainment risk caused by turbulent flow is reduced, the angle of the first positioning shell and the position of the discharging hopper can be rapidly adjusted through the arrangement of the sliding rail, the adjustable first supporting rod and the adjustable second supporting rod and the linkage design of the multiple clamping grooves, and the working efficiency is improved. The feeding port of the sand core body is accurately matched, gas in a cavity can be efficiently exhausted through the exhaust hole with the inclined angle and an active exhaust and multi-stage exhaust system of the exhaust fan, air holes are prevented from being formed, and therefore the surface smoothness and the internal compactness of a casting are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of casting processing technology, specifically relating to the sand core structure for through-hole casting of castings. Background Technology

[0002] Sand casting is a casting method that produces castings in sand molds. Steel, iron, and most non-ferrous alloy castings can be obtained using sand casting. Because the molding materials used in sand casting are inexpensive and readily available, and the mold manufacturing is simple, it can adapt to single-piece production, batch production, and mass production of castings. For a long time, it has been a basic process in casting production. The sand core structure is mainly used to form the structure of the casting during the casting process. Therefore, the overall structure of the sand core structure has a great influence on the performance of the casting.

[0003] A search revealed Chinese patent CN221695191U, which discloses a sand core structure for through-hole casting of castings. However, it still has the following drawbacks: when the solution is poured into the sand core, the molten metal flows directly into the sand core cavity at high speed, which easily generates turbulence and gas entrainment. After cooling, this forms pores, affecting the density and surface quality of the casting. Utility Model Content

[0004] The purpose of this invention is to provide a sand core structure for through-hole casting of castings, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sand core structure for through-hole casting of castings, including a first casting box and a second casting box disposed above the first casting box. The first casting box and the second casting box are bolted together. A sand core body is disposed inside the first casting box and the second casting box. A first positioning shell is disposed above the sand core body. A first heat-resistant ceramic is disposed inside the first positioning shell. A second positioning shell is disposed above the first positioning shell. A second heat-resistant ceramic is disposed inside the second positioning shell. A serpentine groove is formed on one side of both the first heat-resistant ceramic and the second heat-resistant ceramic.

[0006] Preferably, a feeding hopper is fixedly connected to one side of the first positioning shell. The vertical cross-section of the feeding hopper is semi-arc, and the horizontal cross-section of the feeding hopper is conical. The feeding hopper communicates with the interior of the serpentine groove. A discharging hopper is fixedly connected to the side of the first positioning shell away from the feeding hopper. The discharging hopper communicates with the interior of the serpentine groove.

[0007] Preferably, the second heat-resistant ceramic has a plurality of vent holes on the side away from the serpentine groove, each vent hole having a certain inclination angle, and the second positioning shell is fixedly connected to the vent holes at positions corresponding to each other with an vent pipe.

[0008] Preferably, two slide rails are symmetrically installed on the surface of the first casting box, and a first support rod is slidably connected to the surface of each slide rail. The first support rod is rotatably connected to the first positioning shell. Two second support rods are symmetrically rotatably connected to the bottom surface of the first positioning shell. A positioning rod is fixedly connected to the end of each second support rod away from the first positioning shell. Two clamping plates are symmetrically fixedly connected to the surface of the first casting box. A clamping groove is opened inside the clamping plate. The positioning rod is inserted into the groove and slidably connected to the clamping plate.

[0009] Preferably, each of the first support rods is internally threaded with a positioning bolt, one end of which is in contact with the first casting box.

[0010] Preferably, a connecting column is bolted to the surface of the first casting box, and a support frame is rotatably connected to one end of the connecting column via a bearing. An exhaust fan is installed at the end of the support frame away from the connecting column, and the exhaust fan is located above the sand core body.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model extends the flow path of the metal solution by using a serpentine groove design, which significantly reduces the flow velocity and reduces the risk of gas entrainment caused by turbulence.

[0013] 2. This utility model, through its sliding rail, adjustable first and second support rods, and multi-slot linkage design, allows for rapid adjustment of the angle of the first positioning shell and the position of the discharge hopper, precisely matching the inlet of the sand core body.

[0014] 3. This utility model, through the active exhaust of the vent holes with inclined angles and the exhaust fan, has a multi-stage exhaust system that can efficiently discharge the gas in the mold cavity, avoid the formation of air holes, and thus greatly improve the surface smoothness and internal density of the casting. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the card plate and positioning rod structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the second heat-resistant ceramic and the serpentine groove structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the serpentine groove and exhaust hole structure of this utility model.

[0019] In the diagram: 1. First casting box; 2. Second casting box; 3. Sand core body; 4. First positioning shell; 5. Second positioning shell; 6. First heat-resistant ceramic; 7. Second heat-resistant ceramic; 8. Serpentine groove; 9. Feed hopper; 10. Discharge hopper; 11. Vent hole; 12. Vent pipe; 13. Slide rail; 14. First support rod; 15. Clamping plate; 16. Clamping slot; 17. Positioning rod; 18. Second support rod; 19. Connecting column; 20. Support frame; 21. Exhaust fan; 22. Positioning bolt. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-4This utility model provides a sand core structure for through-hole casting of castings. The sand core structure includes a first casting box 1 and a second casting box 2 located above the first casting box 1. The first casting box 1 and the second casting box 2 are bolted together. A sand core body 3 is arranged inside the first casting box 1 and the second casting box 2. A first positioning shell 4 is arranged above the sand core body 3. A first heat-resistant ceramic 6 is arranged inside the first positioning shell 4. A second positioning shell 5 is arranged above the first positioning shell 4. A second heat-resistant ceramic 7 is arranged inside the second positioning shell 5. A serpentine groove 8 is opened on one side of both the first heat-resistant ceramic 6 and the second heat-resistant ceramic 7. A feed hopper 9 is fixedly connected to one side of the first positioning shell 4. The feed hopper 9 has a semi-arc vertical section and a conical horizontal section. The feed hopper 9 and the serpentine groove 8 are interconnected. A discharge hopper 10 is fixedly connected to the side of the first positioning shell 4 away from the feed hopper 9. The discharge hopper 10 and the serpentine groove 8 are interconnected. When casting is required, the sand core body 3 is placed inside the first casting box 1 and the second casting box 2 respectively. Then, the two sand core bodies 3 are shaped into the required shape using a mold. The second casting box 2 is then placed on top of the first casting box 1 and connected by threads. The first heat-resistant ceramic 6 and the second heat-resistant ceramic 7 are then placed inside the first positioning shell 4 and the second positioning shell 5 respectively, with the two serpentine grooves 8 located on adjacent sides. The second positioning shell 5 is then placed on top of the first positioning shell 4, so that the first heat-resistant ceramic 6 and the second heat-resistant ceramic 7 fit together, making the two serpentine grooves 8 a whole. Then, the discharge hopper 10 is aligned with the inlet of the sand core body 3. When slurry is needed, the slurry is poured into the inside of the inlet hopper 9. The solution flows into the inside of the serpentine grooves 8. Due to the shape of the serpentine grooves 8, the distance of solution flow is increased, thus slowing down the flow rate of the solution and greatly reducing the speed at which the solution enters the inside of the sand core body 3. This avoids the generation of more gas due to the fast flow rate of the solution, which would cause porosity on the surface of the casting.

[0022] In this embodiment, the second heat-resistant ceramic 7 has several vent holes 11 on the side away from the serpentine groove 8. Each vent hole 11 has a certain inclination angle. The second positioning shell 5 is fixedly connected to the vent pipe 12 at the corresponding positions of the vent holes 11. When the solution enters the interior of the first heat-resistant ceramic 6, the gas generated by the solution will be discharged through the vent holes 11 and the vent pipe 12, further reducing the presence of gas. The inclination angle of the vent holes 11 ensures that the solution inside the serpentine groove 8 will be discharged through the vent holes 11.

[0023] In this embodiment, two slide rails 13 are symmetrically installed on the surface of the first casting box 1. A first support rod 14 is slidably connected to the surface of each slide rail 13. The first support rod 14 is rotatably connected to the first positioning shell 4. Two second support rods 18 are symmetrically rotatably connected to the bottom surface of the first positioning shell 4. A positioning rod 17 is fixedly connected to the end of each second support rod 18 away from the first positioning shell 4. Two clamping plates 15 are symmetrically fixedly connected to the surface of the first casting box 1. A clamping groove 16 is opened inside each clamping plate 15. The positioning rod 17 is inserted into the inside of the clamping groove 16 and slidably connected to the clamping plate 15. To accommodate different inlets at various locations on the core body 3, the first positioning shell 4 can be pushed to slide on the surface of the slide rail 13 via the first support rod 14. When the flow rate needs to be adjusted, the first positioning shell 4 is rotated around the axis connected to the first support rod 14 until it reaches a suitable angle. Then, the second support rod 18 is rotated until the positioning rod 17 is inserted into the appropriate slot 16 and limited by the locking plate 15. This allows the flow rate of the solution to be adjusted by changing the rotation angle of the first positioning shell 4.

[0024] In this embodiment, each first support rod 14 is internally threaded with a positioning bolt 22, one end of which is in contact with the first casting box 1. When the discharge hopper 10 is adjusted to be above the inlet of the sand core body 3, force is applied to the positioning bolt 22, causing the positioning bolt 22 to rotate inside the first support rod 14 and to be in contact with the first casting box 1. The position of the discharge hopper 10 is positioned by the friction between the positioning bolt 22 and the first casting box 1.

[0025] In this embodiment, a connecting column 19 is bolted to the surface of the first casting box 1. One end of the connecting column 19 is rotatably connected to a support frame 20 via a bearing. An exhaust fan 21 is installed at the end of the support frame 20 away from the connecting column 19, and the exhaust fan 21 is located above the sand core body 3. When the solution is poured into the sand core body 3, the exhaust fan 21 is connected to an external power source and started. The exhaust fan 21 extracts the gas generated inside the sand core body 3 when the solution is poured in, further reducing the presence of gas. When the exhaust fan 21 is not in use, the support frame 20 can be rotated at the top of the connecting column 19, facilitating the disassembly and installation of the sand core body 3.

[0026] The use of this utility model involves the following steps:

[0027] S1: When casting is required, the sand core body 3 is placed inside the first casting box 1 and the second casting box 2 respectively. Then, the two sand core bodies 3 are shaped into the required shape using a mold. The second casting box 2 is then placed on top of the first casting box 1 and connected by threads. The first heat-resistant ceramic 6 and the second heat-resistant ceramic 7 are then placed inside the first positioning shell 4 and the second positioning shell 5 respectively, with the two serpentine grooves 8 located on adjacent sides. The second positioning shell 5 is then placed on top of the first positioning shell 4, so that the first heat-resistant ceramic 6 and the second heat-resistant ceramic 7 fit together, and the two serpentine grooves 8 are integrated into a whole. Then, the discharge hopper 10 is aligned with the inlet of the sand core body 3. When material needs to be injected, the material is poured into the inside of the inlet hopper 9. The solution will flow into the inside of the serpentine groove 8. Due to the shape of the serpentine groove 8, the distance of solution flow is increased, thus slowing down the flow rate of the solution and greatly reducing the speed at which the solution enters the inside of the sand core body 3.

[0028] S2: When the solution enters the interior of the first heat-resistant ceramic 6, the gas generated by the solution will be discharged through the vent hole 11 and the vent pipe 12, further reducing the presence of gas. The inclined angle of the vent hole 11 allows the solution inside the serpentine groove 8 to be discharged through the vent hole 11.

[0029] S3: In order to accommodate the feed inlets at different positions of the sand core body 3, the first positioning shell 4 can be pushed to slide on the surface of the slide rail 13 via the first support rod 14. When the flow rate needs to be adjusted, the first positioning shell 4 is rotated around the axis connected to the first support rod 14 until it is rotated to a suitable angle. Then the second support rod 18 is rotated until the positioning rod 17 is inserted into the appropriate slot 16 and limited by the card plate 15.

[0030] S4: After the discharge hopper 10 is adjusted to be above the inlet of the sand core body 3, force is applied to the positioning bolt 22 so that the positioning bolt 22 rotates inside the first support rod 14 and fits against the first casting box 1. The position of the discharge hopper 10 is positioned by the friction between the positioning bolt 22 and the first casting box 1.

[0031] S5: When the solution is poured into the interior of the sand core body 3, the exhaust fan 21 is connected to an external power source and started. The exhaust fan 21 extracts the gas generated inside the sand core body 3 when the solution is poured in, further reducing the presence of gas. When the exhaust fan 21 is not in use, it can be rotated on the top of the connecting column 19 via the support frame 20.

[0032] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0033] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sand core structure for through-hole casting of castings, comprising a first casting box (1) and a second casting box (2) disposed above the first casting box (1), characterized in that: The first casting box (1) and the second casting box (2) are bolted together. The first casting box (1) and the second casting box (2) are provided with a sand core body (3). The sand core body (3) is provided with a first positioning shell (4) above it. The first positioning shell (4) is provided with a first heat-resistant ceramic (6) inside it. The first positioning shell (4) is provided with a second positioning shell (5) above it. The second positioning shell (5) is provided with a second heat-resistant ceramic (7) inside it. One side of the first heat-resistant ceramic (6) and the second heat-resistant ceramic (7) is provided with a serpentine groove (8).

2. The sand core structure for through-hole casting of castings according to claim 1, characterized in that: A feeding hopper (9) is fixedly connected to one side of the first positioning shell (4). The vertical cross-section of the feeding hopper (9) is semi-arc, and the horizontal cross-section of the feeding hopper (9) is conical. The feeding hopper (9) communicates with the interior of the serpentine groove (8). A discharging hopper (10) is fixedly connected to the side of the first positioning shell (4) away from the feeding hopper (9). The discharging hopper (10) communicates with the interior of the serpentine groove (8).

3. The sand core structure for through-hole casting of castings according to claim 2, characterized in that: The second heat-resistant ceramic (7) has several exhaust holes (11) on the side away from the serpentine groove (8). Each exhaust hole (11) has a certain inclination angle. The second positioning shell (5) is fixedly connected to an exhaust pipe (12) at a position corresponding to the exhaust hole (11).

4. The sand core structure for through-hole casting of castings according to claim 1, characterized in that: Two slide rails (13) are symmetrically installed on the surface of the first casting box (1). A first support rod (14) is slidably connected to the surface of each slide rail (13). The first support rod (14) and the first positioning shell (4) are rotatably connected. Two second support rods (18) are symmetrically rotatably connected to the bottom surface of the first positioning shell (4). A positioning rod (17) is fixedly connected to the end of each second support rod (18) away from the first positioning shell (4). Two clamping plates (15) are symmetrically fixedly connected to the surface of the first casting box (1). A clamping groove (16) is opened inside each clamping plate (15). The positioning rod (17) is inserted into the inside of the clamping groove (16) and slidably connected to the clamping plate (15).

5. The sand core structure for through-hole casting of castings according to claim 4, characterized in that: Each of the first support rods (14) has an internal threaded connection to a positioning bolt (22), one end of which is in contact with the first casting box (1).

6. The sand core structure for through-hole casting of castings according to claim 1, characterized in that: The surface of the first casting box (1) is bolted with a connecting column (19). One end of the connecting column (19) is rotatably connected to a support frame (20) via a bearing. An exhaust fan (21) is installed at the end of the support frame (20) away from the connecting column (19). The exhaust fan (21) is located above the sand core body (3).

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