3D printing sand core gravity casting device capable of achieving rapid forming

Abstract

The utility model relates to the technical field of 3D printing, in particular to a 3D printing sand core gravity casting device capable of achieving rapid prototyping, which comprises a sand mold box, a bottom die is arranged in a square groove of the sand mold box in a sliding mode, the square groove of the sand mold box is provided with a machining area and a movable area through the bottom die, and a plurality of groups of sand cores are movably connected in the movable area. The printing spray head and the powder spreading device are integrated in the same movable module, the module has an intelligent switching mechanism, in the powder spreading stage, the module can spray powder according to a set program, it is ensured that the thickness of a powder bed is consistent, in the printing stage, the module rapidly switches working modes, the spray head is started, and the spraying efficiency is improved. According to the two-dimensional section data of the sand core, the adhesive is sprayed in a high-precision mode, the product quality is improved, the requirement for high-precision casting in the high-end manufacturing industry is met, the formed mold can be recycled after being separated from the sand core, and waste of sand materials is reduced.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, specifically a 3D printing sand core gravity casting device that can rapidly produce 3D cores. Background Technology

[0002] A 3D printing sand core gravity casting device generally includes a printing nozzle, a powder bed, a powder supply device, and a powder spreading device. The printing nozzle can accurately spray resin binder, the powder bed is used to hold the mixture of molding sand and curing agent, and the powder supply device and the powder spreading device work together to achieve uniform spreading of molding sand.

[0003] In existing 3D printing sand core gravity casting devices, the printing nozzle is responsible for spraying the binder, while the powder spreading device is responsible for laying the powder bed. The two operate independently and require multiple driving devices. This mode results in a complex equipment structure and a large footprint. When the nozzle and powder spreading device work alternately, there are many idle strokes, which makes the printing cycle longer. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, the printing nozzle and powder spreading device operate independently, requiring multiple driving devices. This mode leads to problems such as complex equipment structure and large footprint. This utility model proposes a 3D printing sand core gravity casting device that can rapidly form.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a 3D printing sand core gravity casting device that can be rapidly formed, including a sand mold box, a bottom mold sliding inside the square groove of the sand mold box, and a processing area and an active area respectively set in the square groove of the sand mold box through the bottom mold, and a number of sand cores are movably connected inside the active area.

[0006] A spraying assembly is provided on the outside of the sand mold box. The spraying assembly includes a support frame. Two sets of support frames are provided and fixed to the beginning and end of the sand mold box respectively. A first motor is fixedly connected to one end of the support frame. The output end of the first motor passes through the support frame and is fixedly connected to a first lead screw. A support rod is threaded to the outside of the first lead screw. A second motor and a powder spreading device are fixedly connected to the surface of the support rod respectively. The bottom end of the powder spreading device has a discharge port. The output end of the second motor is fixedly connected to a belt-type sand conveyor. The discharge port is located above the conveying surface of the belt-type sand conveyor. A scraper is fixedly connected to the surface of the powder spreading device. The scraper slides back and forth on the sand core on the surface of the processing area. A baffle is fixedly connected to the bottom end of the powder spreading device. The baffle is set on the same horizontal line as the processing area.

[0007] Preferably, the powder spreading device includes several sets of sand cores to be crushed inside. A dust cover is fixedly connected to the top of the powder spreading device. A transverse sliding groove is opened on the surface of the powder spreading device. A second lead screw is fixedly connected inside the transverse sliding groove of the powder spreading device. A glue spray gun head is threadedly connected to the outer side of the second lead screw. The glue spray gun head, baffle, and scraper are set on the surface of the sand core.

[0008] Preferably, the surface of the scraper is provided with a vibration assembly, which includes a fixed frame. One side of the fixed frame is fixedly connected to the scraper, and a support cylinder is fixedly connected to one side of the fixed frame. The surface of the support cylinder is provided with a movable groove, and a sliding block is slidably connected to the movable groove on the surface of the support cylinder. A spring is fixedly connected to the surface of the sliding block, and an extension rod is fixedly connected to the other end of the spring. The bottom end of the extension rod is fixed to the top end of the support cylinder.

[0009] Preferably, a telescopic head is fixedly connected to the surface of the sliding block. The telescopic head penetrates the interior of the support cylinder and slides within the support cylinder. The other end of the telescopic head is movably connected to the outside of the powder spreading device.

[0010] Preferably, a third motor is fixedly connected to the top of the scraper, a gear is fixedly connected to the output end of the third motor, a cam is fixed to the output end of the gear, and the surface of the cam slides on the surface of the movable groove.

[0011] Preferably, the outlet of the powder spreading device faces downwards, and the powder spreading device, scraper and glue spray gun head slide on the surface of the sand core. The glue spray gun head and scraper are respectively arranged on both sides of the powder spreading device.

[0012] Preferably, the nozzle of the glue spray gun is oriented toward the surface of the sand core, which is located inside the processing area.

[0013] The advantages of this utility model are:

[0014] This invention integrates powder spreading and adhesive spraying into a single unit, replacing the previous method that required two separate drive devices for adhesive spraying and powder spreading. A single drive device controls the synchronous movement of both spraying and dispensing, reducing space requirements. The uniformly mixed sand core and curing agent are evenly spread on the powder bed, ensuring consistent thickness. Upon entering the printing stage, the module quickly switches operating modes, the nozzle activates, and precisely sprays the binder based on the two-dimensional cross-sectional data of the sand core, binding the sand particles into shape. This integrated design not only reduces the physical space requirements of the equipment but also significantly shortens the idle travel time. A vibration device is added to the outside of the powder spreading device to prevent the uniformly mixed sand core from adhering to the inner wall, which could lead to unstable material discharge at the powder spreading device's outlet and affect mold formation during later casting. Furthermore, the mold and sand core can be separated after forming for recycling, reducing sand waste. This invention solves the problem of existing 3D printing sand core gravity casting devices where the printing nozzle handles binder spraying and the powder spreading device handles powder bed laying, requiring multiple drive devices and resulting in complex equipment structures. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the powder spreading device of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the vibration component of this utility model;

[0019] Figure 4 This is a schematic diagram of the exploded view of the spraying assembly of this utility model;

[0020] Figure 5 This is a structural schematic diagram of the cross-sectional view of the sand mold box of this utility model.

[0021] In the diagram: 1. Sand mold box; 11. Bottom mold; 12. Processing area; 13. Moving area; 14. Quartz sand; 2. Spraying assembly; 21. Support frame; 22. First motor; 23. First lead screw; 24. Support rod; 25. Second motor; 26. Belt-type sand conveyor; 27. Discharge port; 28. Powder spreading device; 29. ​​Second lead screw; 210. Spray gun head; 211. Baffle; 212. Scraper; 213. Dust cover; 3. Vibration assembly; 31. Support cylinder; 32. Fixed frame; 33. Moving groove; 34. Sliding block; 35. Telescopic head; 36. Extension rod; 37. Spring; 38. Cam; 39. Gear; 310. Third motor. Detailed Implementation

[0022] 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 scope of protection of the present utility model.

[0023] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0024] This application discloses a rapid prototyping 3D-printed sand core gravity casting device. (Refer to...) Figure 1 and Figure 4 A 3D printing sand core gravity casting device for rapid prototyping includes a sand mold box 1, a bottom mold 11 sliding inside the square groove of the sand mold box 1, and a processing area 12 and an active area 13 respectively set in the square groove of the sand mold box 1 through the bottom mold 11. Several sets of quartz sand 14 are movably connected inside the active area 13.

[0025] A spraying assembly 2 is provided on the outside of the sand mold box 1. The spraying assembly 2 includes a support frame 21. Two sets of support frames 21 are provided and fixed to the beginning and end of the sand mold box 1 respectively. A first motor 22 is fixedly connected to one end of the support frame 21. The output end of the first motor 22 passes through the support frame 21 and is fixedly connected to a first lead screw 23. A support rod 24 is threaded to the outside of the first lead screw 23. A second motor 25 and a powder spreading device 28 are fixedly connected to the surface of the support rod 24 respectively. The bottom end of the powder spreading device 28 has a discharge port 27 to facilitate the overflow of the sand core from the outlet of the discharge port 27. The output end of the second motor 25 is fixedly connected to a belt-type sand conveyor belt 26. The discharge port 27 is located above the conveying surface of the belt-type sand conveyor belt 26 to facilitate the conveying of sand cores by the belt-type sand conveyor belt 26. A scraper 212 is fixedly connected to the surface of the powder spreading device 28. The scraper 212 slides back and forth on the quartz sand 14 on the surface of the processing area 12 to spread the sand cores and spray glue simultaneously. A baffle 211 is fixedly connected to the bottom end of the powder spreading device 28 to isolate the discharge port 27 and the glue spray nozzle 210 to prevent the glue from the discharge port 27 from entering dust.

[0026] Reference Figure 2 and Figure 4 The powder spreading device 28 houses the sand core, and a dust cover 213 is fixedly connected to the top of the powder spreading device 28 to prevent dust from entering the quartz stone inside the powder spreading device 28. A transverse sliding groove is opened on the surface of the powder spreading device 28, and a second lead screw 29 is fixedly connected inside the transverse sliding groove of the powder spreading device 28. A glue spraying gun head 210 is threadedly connected to the outside of the second lead screw 29. After the second lead screw 29 is rotated, it is used to control the movement of the glue spraying gun head 210. The glue spraying gun head 210, the baffle 211, and the scraper 212 are set on the surface of the quartz sand 14. By setting the molding and reasonably arranging the time of material discharge, hanging material, and glue spraying, the waiting time is reduced. There is no need for two sets of drive devices. It is sufficient to connect the glue spraying gun head 210 to the drive device of the powder spreading device 28.

[0027] Reference Figure 1 and Figure 2 The surface of the scraper 212 is provided with a vibration component 3. The vibration component 3 includes a fixed frame 32. One side of the fixed frame 32 is fixedly connected to the scraper 212. A support cylinder 31 is fixedly connected to one side of the fixed frame 32. A movable groove 33 is opened on the surface of the support cylinder 31. A sliding block 34 is slidably connected to the movable groove 33 on the surface of the support cylinder 31. A spring 37 is fixedly connected to the surface of the sliding block 34. An extension rod 36 is fixedly connected to the other end of the spring 37. The bottom end of the extension rod 36 is fixed to the top end of the support cylinder 31.

[0028] Reference Figure 1 and Figure 3The sliding block 34 is fixedly connected to a telescopic head 35, which penetrates the interior of the support cylinder 31 and slides within the support cylinder 31. The other end of the telescopic head 35 is movably connected to the outside of the powder spreading device 28 for pressing against the powder spreading device 28.

[0029] Reference Figure 3 and Figure 4 The top of the scraper 212 is fixedly connected to a third motor 310. The output end of the third motor 310 is fixedly connected to a gear 39. The output end of the gear 39 is fixedly connected to a cam 38. The surface of the cam 38 slides on the surface of the movable sliding block 34. The cam 38 is used to control the rotation of the cam 38.

[0030] Reference Figure 2 and Figure 4 The outlet 27 of the powder spreading device 28 faces downward. The powder spreading device 28, scraper 212 and spray gun head 210 slide on the surface of quartz sand 14. The spray gun head 210 and scraper 212 are respectively set on both sides of the powder spreading device 28. This design avoids a lot of idle stroke when the spray gun head 210 and the powder spreading device 28 work alternately. Through the integrated design, the structure is simplified. The spraying range of the spray gun head 210 is limited to the sliding coverage of the scraper 212 to prevent the scraping range from not covering the spraying range.

[0031] Reference Figure 2 and Figure 4 The nozzle of the glue spray gun 210 faces the surface of the quartz sand 14. When the nozzle is activated, the glue spray gun 210 sprays adhesive with high precision according to the two-dimensional cross-sectional data of the sand core inside, and binds the sand particles into shape. The quartz sand 14 is set inside the processing area 12 to reduce the occupancy of the internal space.

[0032] Working principle: First, the operator adjusts the position of the bottom mold 11 in the sand mold box 1 square groove according to the shape and size of the mold to be made in the processing area 12 of the sand mold box 1 square groove. Then, the first motor 22 is started. The output end of the first motor 22 drives the first lead screw 23 to rotate inside the support frame 21. During the rotation, the support rod 24 is also rotated. Before this, the second motor 25 is also started synchronously with the first motor 22. The support rod 24 drives the powder spreading device 28 and related structures such as scraper 212 to move synchronously on the surface of the quartz sand 14. During the movement, the quartz sand 14 inside the powder spreading device 28 is dropped from the discharge port 27 and falls above the bearing surface of the belt sand conveyor 26. The belt sand conveyor 26 receives the powder from the first motor 22. The force generated by the rotation of the output end of the two motors 25 then conveys the quartz sand 14 to the surface of the processing area 12 via the belt-type sand conveyor 26, and performs initial powder spreading. During the powder spreading stage, it can spread the uniformly mixed molding sand and curing agent evenly on the powder bed at a stable and precise speed according to the set program. The scraper 212 on one side of the powder spreading device 28 is used to scrape the quartz sand 14 in the processing area 12 to ensure that the powder bed thickness is consistent. After entering the printing stage, the module quickly switches the working mode. The second lead screw 29 on the side of the powder spreading device 28 controls the glue spraying gun head 210 to spray glue on the surface of the quartz sand 14. The nozzle starts and sprays the binder with high precision according to the two-dimensional cross-sectional data of the sand core to bond the sand particles into shape. After the glue spraying is completed, the same process is repeated to perform secondary powder spreading.

[0033] During the powder spreading process, new quartz sand 14 needs to be added to the powder spreading device 28, and a mixer is added. This causes blockage when the powder spreading device 28 discharges material. The third motor 310 drives the gear component 39 to rotate. By setting different gear ratios for the gear component 39, better torque is generated during rotation, which in turn drives the cam 38 to rotate. During the rotation, the protruding part of the cam 38 pushes the sliding block 34 to slide in the movable groove 33 on the side of the support cylinder 31. At the same time as sliding, the movable groove 33 drives the spring 37 fixedly connected to the side to move towards the gear. The component 39 moves in the direction of rotation. At the same time, the extension rod 36 undergoes elastic deformation after being subjected to traction force and accumulates a certain amount of kinetic energy. When the recess of the cam 38 slides to the surface of the movable groove 33 and contacts it, the reaction force of the spring 37 drives the sliding block 34 to slide along the side of the movable groove 33 along the support cylinder 31. During the sliding process, the sliding block 34 drives the telescopic head 35 to violently impact the surface of the powder spreading device 28. During the impact, the quartz sand 14 mixed with the fixing agent inside the powder spreading device 28 is crushed to ensure that the quartz sand 14 flowing out from the discharge port 27 is uniform and full.

[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.

Claims

1. A rapid prototyping 3D printed sand core gravity casting device, comprising a sand mold box (1), characterized in that: The sand mold box (1) has a bottom mold (11) sliding inside the square groove. The sand mold box (1) has a processing area (12) and an active area (13) respectively set through the bottom mold (11). The active area (13) is connected to several groups of quartz sand (14). A spraying assembly (2) is provided on the outside of the sand mold box (1). The spraying assembly (2) includes a support frame (21). Two sets of support frames (21) are provided and fixed to the beginning and end of the sand mold box (1). A first motor (22) is fixedly connected to one end of the support frame (21). The output end of the first motor (22) passes through the support frame (21) and is fixedly connected to a first lead screw (23). A support rod (24) is threadedly connected to the outside of the first lead screw (23). A second motor (25) and a powder spreading device (28) are fixedly connected to the surface of the support rod (24). The bottom end of the powder spreading device (28) is provided with a discharge port (27). The output end of the second motor (25) is fixedly connected to a belt-type sand conveyor (26). The discharge port (27) is located above the conveying surface of the belt-type sand conveyor (26). A scraper (212) is fixedly connected to the surface of the powder spreading device (28). The scraper (212) slides back and forth on the quartz sand (14) on the surface of the processing area (12). A baffle (211) is fixedly connected to the bottom end of the powder spreading device (28). The baffle (211) and the processing area (12) are set on the same horizontal line.

2. The 3D-printed sand core gravity casting device for rapid prototyping according to claim 1, characterized in that: The powder spreading device (28) contains several sets of quartz sand (14) to be crushed. A dust cover (213) is fixedly connected to the top of the powder spreading device (28). A transverse groove is opened on the surface of the powder spreading device (28). A second lead screw (29) is fixedly connected inside the transverse groove of the powder spreading device (28). A glue spray gun head (210) is threadedly connected to the outside of the second lead screw (29). The glue spray gun head (210), baffle (211), and scraper (212) are set on the surface of the quartz sand (14).

3. The 3D printing sand core gravity casting device for rapid prototyping according to claim 2, characterized in that: The surface of the scraper (212) is provided with a vibration component (3). The vibration component (3) includes a fixed frame (32). One side of the fixed frame (32) is fixedly connected to the scraper (212). A support cylinder (31) is fixedly connected to one side of the fixed frame (32). A movable groove (33) is opened on the surface of the support cylinder (31). A sliding block (34) is slidably connected to the movable groove (33) on the surface of the support cylinder (31). A spring (37) is fixedly connected to the surface of the sliding block (34). An extension rod (36) is fixedly connected to the other end of the spring (37). The bottom end of the extension rod (36) is fixed to the top end of the support cylinder (31).

4. The 3D printing sand core gravity casting device for rapid prototyping according to claim 3, characterized in that: The sliding block (34) has a telescopic head (35) fixedly connected to its surface. The telescopic head (35) penetrates the interior of the support cylinder (31) and slides within the support cylinder (31). The other end of the telescopic head (35) is movably connected to the outside of the powder spreading device (28).

5. The 3D printing sand core gravity casting device for rapid prototyping according to claim 3, characterized in that: The top end of the scraper (212) is fixedly connected to a third motor (310), the output end of the third motor (310) is fixedly connected to a gear (39), the output end of the gear (39) is fixedly connected to a cam (38), and the surface of the cam (38) slides on the surface of the movable groove (33).

6. The 3D-printed sand core gravity casting device for rapid prototyping according to claim 4, characterized in that: The outlet (27) of the powder spreading device (28) faces downward. The powder spreading device (28), the scraper (212) and the glue spray gun head (210) slide on the surface of the quartz sand (14). The glue spray gun head (210) and the scraper (212) are respectively arranged on both sides of the powder spreading device (28).

7. The 3D-printed sand core gravity casting device for rapid prototyping according to claim 6, characterized in that: The nozzle of the glue spray gun (210) is directed toward the surface of the quartz sand (14), which is disposed inside the processing area (12).

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