Sand casting 3D printer printing method

Abstract

The present application relates to the printing method of sand casting 3D printer, including the following steps: first, the sand layer is sprayed on the bottom surface of the sand mold bearing disc, then the glue layer is sprayed on the upper surface of the glue layer; after solidification, the sand mold bearing disc is turned over, and the monitoring equipment detects whether the sand layer on the sand mold bearing disc is loose; then the loose sand layer is adsorbed, then the sand layer is sprayed, and the glue is sprayed after the sand layer is sprayed, or the sand layer is not loose, and the sand layer is sprayed, then the glue is sprayed again; finally, the above steps are repeated until the sand mold is completed, and the sand mold is produced by the method, which greatly reduces the generation of sand mold waste rate, so that the cast sand mold is firm and reliable.

Description

Technical Field

[0001] This invention belongs to the technical field of sand mold 3D casting equipment, specifically relating to a printing method for a sand mold casting 3D printer. Background Technology

[0002] Currently, there are two main types of sand-cast 3D printers on the market: one with a closed-cavity gantry structure and the other with an open robotic arm structure. Both types operate on the same molding principle. Before the printer starts, casting sand and catalyst are mixed in a specific ratio and added to the hopper. The host computer's slicing software slices the CAD model into layers. When printing begins, the nozzle moves to the hopper's outlet, and the feed valve automatically delivers material to the print head. After feeding, the print head moves to the upper left of the printing platform, maintaining a fixed height. It moves from left to right, laying the first layer of casting sand. Since the surface is not smooth after laying the sand, the robotic arm moves the print head from the rightmost end to the left. During this process, the scraper below the nozzle smooths the sand surface. The resin nozzle sprays resin at the areas requiring bonding and curing. The resin reacts with the catalyst in the sand to cure, completing the first layer of printing. This process repeats itself, with each layer printed and the robotic arm driving the nozzle to rise to the next layer to continue printing until the entire model is printed. Using a sand mold 3D printer to make sand molds is efficient and the steps are simple, but there is a problem: if the resin and casting sand are not cured and stabilized, the entire sand mold will be scrapped, making it impossible to cast qualified castings. In view of this, this solution was developed. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a printing method for a sand casting 3D printer, which can detect whether the sand layer and the adhesive layer have been cured. If the curing is not qualified, the sand and adhesive can be sprayed again.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a printing method for a sand casting 3D printer, comprising the following steps:

[0005] S1. Sandblast the bottom surface of the sand mold bearing plate, and then spray adhesive on the upper surface of the adhesive layer;

[0006] S2. After curing, flip the sand mold support plate and use monitoring equipment to check whether the sand layer on the sand mold support plate is loose.

[0007] S3. If the sand layer is loose and shifted, the loose sand layer is sucked away, and then sandblasting is performed on the loose area. After sandblasting, adhesive is sprayed to cure. Alternatively, if the sand layer is not loose, sandblasting is performed on the bonded sand layer, and then adhesive is sprayed again.

[0008] S4. Repeat steps S2-S3 until the sand mold is formed.

[0009] Furthermore, steps S1-S4 are performed using a sand casting 3D printer, which includes a glue spraying and sandblasting device, a detection component, and a sand suction component.

[0010] Furthermore, the adhesive spraying and sandblasting equipment includes a front-to-back moving assembly, a left-to-right moving assembly, a top-to-bottom moving assembly, a sandblasting head, an adhesive spraying head, and a rotating support platform. The sandblasting head and the adhesive spraying head are connected to the outward-facing side of the top-to-bottom moving assembly, with their output ends facing downwards. The top-to-bottom moving assembly drives the sandblasting head and the adhesive spraying head to move up and down, the left-to-right moving assembly drives the top-to-bottom moving assembly to move left and right, and the front-to-back moving assembly drives the left-to-right moving assembly to move back and forth. The rotating support platform is located below the output ends of the sandblasting head and the adhesive spraying head.

[0011] Furthermore, the front and rear moving assembly includes a support frame, front and rear drive screws, and a front and rear moving seat. The front and rear drive screws are rotatably connected to the support frame, and the front and rear moving seat is provided with a first threaded hole, which is adapted to the front and rear drive screws.

[0012] Furthermore, the left and right moving assembly includes a left and right moving seat and a left and right driving screw. The left and right moving seat is provided with a second threaded hole, which is adapted to the left and right driving screw.

[0013] Furthermore, the up-and-down moving assembly includes an up-and-down moving base and an up-and-down driving screw. The up-and-down moving base is provided with a third threaded hole, which is adapted to the up-and-down driving screw.

[0014] Furthermore, the rotating bearing platform includes a rotating disk, a connecting platform, and a rotating column. The rotating disk is rotatably connected to the surface of the connecting platform, and the rotating column is fixed to the side of the connecting platform and drives the connecting platform to rotate. The axis of the rotating disk and the axis of the rotating column are perpendicular to each other.

[0015] Furthermore, the detection component includes a camera, a first lifting body, a first telescopic body, and an integrated infrared scanner. The camera is located on one side of the glue spraying and sandblasting equipment with its imaging end facing the working end of the glue spraying and sandblasting equipment. The first lifting body drives the first telescopic body to move up and down. The integrated infrared scanner is connected to the output end of the first telescopic body. The first telescopic body drives the integrated infrared scanner to scan the working end of the glue spraying and sandblasting equipment.

[0016] Furthermore, the sand suction assembly includes a suction head, a second telescopic body, and a rotating body. The first lifting body drives the rotating body to move up and down. The first telescopic body and the second telescopic body are connected to the side wall of the rotating body. The suction head is connected to the output end of the second telescopic body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention involves sandblasting and then applying adhesive to a sand mold support plate for curing. Once curing is complete, the vertical surface is rotated at a small angle (15°-30°). Monitoring equipment is used to observe whether the sand layer has loosened or shifted. If the sand layer has loosened or shifted, a suction head (similar to a vacuum cleaner) is used to remove the loose sand. Then, sandblasting and adhesive application are repeated until the sand layer is no longer loose. The next layer of sand is then sandblasted, adhesive applied, and cured. This process of sandblasting, adhesive application, and inspection is repeated until the entire sand mold is formed. This method greatly reduces the scrap rate of sand molds, resulting in a robust and reliable cast sand mold.

[0019] 2. In this solution's sand casting 3D printer printing method, the detection of sand layer looseness is achieved through the cooperation of a rotating disk, connecting platform, rotating column, and camera. The rotating column causes the connecting platform and rotating disk to flip. If there is any loosely solidified sand layer, it will tilt to one side under the action of gravity, causing pits on the sand layer surface. The camera identifies whether the sand layer is loose by comparing images before and after the flip. Once looseness is confirmed, the rotating body switches to the position where the suction head faces the sand mold support disk, and the second telescopic body extends, with the suction head positioned above the sand layer to suction the sand. After suction is completed, the rotating body switches to the position where the integrated infrared scanner faces the sand mold support disk, and the first telescopic body extends. The integrated infrared scanner scans for defects in the sand layer on the surface of the sand mold support disk. Then, the first telescopic body resets, and the adhesive spraying and sandblasting equipment repairs and solidifies the defects. Attached Figure Description

[0020] Figure 1 This is a top view of the structure of a sand casting 3D printer according to the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the adhesive spraying and sandblasting equipment of the present invention;

[0022] Figure 3 This is a partial three-dimensional structural diagram of the rotating bearing platform in this invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the sand mold bearing plate and the sand mold limiting frame in this invention;

[0024] Figure 5 This is a cross-sectional view of the sand mold bearing plate and the sand mold limiting frame in this invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the sand suction component and the integrated infrared scanner for scanning and receiving in this invention.

[0026] The diagram shows the following components: 1. Glue spraying and sandblasting equipment; 11. Up-down moving component; 12. Left-right moving component; 13. Front-back moving component; 14. Sandblasting head; 15. Glue spraying head; 16. Rotating support platform; 161. Rotating disk; 162. Connecting platform; 163. Rotating column; 2. Detection component; 21. Camera; 22. First lifting body; 221. Lower base; 222. Mounting moving plate; 223. Upper fixed plate; 224. Fourth screw; 225. Guide column; 23. First telescopic body; 24. Integrated infrared scanner; 3. Sand suction component; 31. Suction head; 32. Second telescopic body; 33. Rotating body; 4. Sand mold support disk; 41. First limiting groove; 42. Mounting hole; 5. Sand mold limiting frame; 51. Second limiting groove; 52. Protrusion; 6. Magnet; 7. Ferromagnetic metal. Detailed Implementation

[0027] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0028] like Figure 1-6 As shown, this embodiment provides a sand casting 3D printer, which includes a glue spraying and sandblasting device 1, a detection component 2, a sand suction component 3, a control system, a sand mold support plate 4, and a sand mold limiting frame 5.

[0029] The adhesive spraying and sandblasting equipment 1 includes a front-to-back moving component 13, a left-to-right moving component 12, a top-to-bottom moving component 11, a sandblasting head 14, an adhesive spraying head 15, and a rotating support platform 16. The sandblasting head 14 and the adhesive spraying head 15 are connected to the outward-facing side of the top-to-bottom moving component 11, with the output ends of the sandblasting head 14 and the adhesive spraying head 15 facing downwards. The top-to-bottom moving component 11 is used to drive the sandblasting head 14 and the adhesive spraying head 15 to move up and down. The left-to-right moving component 12 is used to drive the top-to-bottom moving component 11 to move left and right. The front-to-back moving component 13 is used to drive the left-to-right moving component 12 to move back and forth. The rotating support platform 16 is located below the output ends of the sandblasting head 14 and the adhesive spraying head 15. Specifically, the front-to-back moving assembly 13 includes a support frame, front-to-back drive screws, and front-to-back moving seats. The front-to-back drive screws are rotatably connected to the support frame. The front-to-back moving seats are provided with a first threaded hole that is adapted to the front-to-back drive screws. The left-to-right moving assembly 12 includes a left-to-right moving seat and a left-to-right drive screw. The left-to-right moving seat is provided with a second threaded hole that is adapted to the left-to-right drive screws. The up-and-down moving assembly 11 includes an up-and-down moving seat and an up-and-down drive screw. The up-and-down moving seat is provided with a third threaded hole that is adapted to the up-and-down drive screws.

[0030] All rotating components in this design are driven by a motor. The rotating support platform 16 includes a rotating disk 161, a connecting platform 162, and a rotating column 163. The rotating disk 161 is rotatably connected to the surface of the connecting platform 162, and the rotating column 163 is fixed to the side of the connecting platform 162 and drives the connecting platform 162 to rotate. The axis of the rotating disk 161 and the axis of the rotating column 163 are perpendicular to each other.

[0031] The detection component 2 includes a camera 21, a first lifting body 22, a first telescopic body 23, and an integrated infrared scanner 24. The first telescopic body 23 is a cylinder. The camera 21 is located on one side of the glue spraying and sandblasting equipment 1 with its imaging end facing the working end of the equipment. The integrated infrared scanner 24 is connected to the output end of the first telescopic body 23. The first telescopic body 23 drives the integrated infrared scanner 24 to scan the working end of the glue spraying and sandblasting equipment 1. The sand suction component 3 includes a suction head 31, a second telescopic body 32, and a rotating body 33. The second telescopic body 32 is a cylinder. The first lifting body 22 drives the rotating body 33 to rise and fall. The first telescopic body 23 and the second telescopic body 32 are connected to the rotating body 33. The suction head 31 is connected to the output end of the second telescopic body 32 on the side wall. Specifically, the first lifting body 22 includes a lower base 221, an upper fixed plate 223, a mounting moving plate 222, a fourth screw 224, and a guide post 225. There are two fourth screws 224 and two guide posts 225. The fourth screws 224 and guide posts 225 are arranged in a matrix on the upper surface of the lower base 221. The upper ends of the fourth screws 224 and guide posts 225 are connected to the upper fixed plate 223. The mounting moving plate 222 has a guide hole for the guide post 225 to pass through. The mounting moving plate 222 has a fourth threaded hole that is adapted to the fourth screw 224. The rotating body 33 is fixedly arranged on the upper surface of the mounting moving plate 222.

[0032] The sand mold support plate 4 is provided with multiple mounting holes 42 for bolt connection with the rotating plate 161. The sand mold support plate 4 is provided with multiple first limiting grooves 41, and a magnet 6 is fixed at the bottom of the first limiting groove 41. The sand mold limiting frame 5 is an annular frame made of plastic ring. The lower surface of the sand mold limiting frame 5 is provided with multiple protrusions 52, and the bottom surface of the protrusions 52 is connected to a ferromagnetic metal 7, such as iron. The protrusions 52 of the sand mold limiting frame 5 are adapted to the first limiting grooves 41. The upper surface of the sand mold limiting frame 5 is provided with multiple second limiting grooves 51, and a magnet 6 is fixed at the bottom of the second limiting grooves 51. The protrusions 52 and second limiting grooves 51 between adjacent sand mold limiting frames 5 are adapted to each other. The sand mold limiting frame 5 is mainly used to limit the sand mold with a certain height to prevent the sand mold from breaking due to excessive height when the rotating column 163 drives the connecting platform 162 and the rotating plate 161 to rotate.

[0033] This embodiment also provides a printing method for a sand casting 3D printer, including the following steps:

[0034] S1. Sandblast the bottom surface of the sand mold bearing plate 4, and then spray adhesive on the upper surface of the adhesive layer;

[0035] S2. After curing, flip the sand mold support plate 4 over and use monitoring equipment to check whether the sand layer on the sand mold support plate 4 is loose.

[0036] S3. If the sand layer is loose and shifted, the loose sand layer is sucked away, and then sandblasting is performed on the loose area. After sandblasting, adhesive is sprayed to cure. Alternatively, if the sand layer is not loose, sandblasting is performed on the bonded sand layer, and then adhesive is sprayed again.

[0037] S4. Repeat steps S2-S3 until the sand mold is formed.

[0038] The specific steps of S1 are as follows: First, install the sand mold support plate 4 onto the rotating plate 161. The up and down moving component 11 is calibrated and zeroed. With the cooperation of the front and back moving component 13 and the left and right moving component 12, the sandblasting head 14 moves above the sand mold support plate 4 and cooperates with the rotating plate 161 to perform sandblasting. Then, the left and right moving component 12 moves to switch the glue spraying head 15 to the sand mold support plate 4 and cooperates with the rotating plate 161 to perform glue spraying and curing.

[0039] The specific steps of S2 are as follows: the up-down moving component 11 moves upward, the camera 21 takes a picture of the first layer of sand mold after curing, and then the rotating column 163 drives the connecting table 162 and the rotating disk 161 to achieve a left-right rotation of 15°-30°. The camera 21 takes another picture of the first layer of sand mold after the rotation. The control system compares the two pictures to identify whether the sand mold is loose.

[0040] The specific steps of S3 are as follows: If loosening occurs, the rotating body 33 switches to the dust suction mode, the suction head 31 faces the sand mold support plate 4, the second telescopic body 32 extends, the suction head 31 absorbs the loose sand, and then resets. The rotating body 33 switches to the infrared scanning mode, the first telescopic body 23 extends, and the integrated infrared scanner 24 scans the defects in the sand layer on the surface of the sand mold support plate 4. Then the first telescopic body 23 resets, transmits the scanning information to the control system, and then controls the glue spraying and sandblasting equipment 1 to repair it. Then a loosening detection is performed again. If no loosening occurs, the second layer of sand mold sandblasting and glue spraying curing begins.

[0041] The specific steps of S4 are as follows: the sandblasting head 14 and the glue spraying head 15 perform sandblasting and glue spraying curing in cooperation with the front and rear moving component 13, the left and right moving component 12 and the up and down moving component 11. The suction head 31 and the integrated infrared scanner 24 perform sand suction and scanning in cooperation with the first lifting body 22, the first telescopic body 23 and the second telescopic body 32. The above cycle is repeated until the sand mold is formed.

[0042] Using the method described in this scheme to cast sand molds greatly reduces the scrap rate of sand molds, resulting in strong and reliable sand molds.

[0043] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A printing method for a sand casting 3D printer, characterized in that: Includes the following steps: S1. Sandblast the bottom surface of the sand mold bearing plate, and then spray adhesive on the upper surface of the adhesive layer; S2. After curing, rotate the sand mold support plate 15°-30° and use monitoring equipment to check whether the sand layer on the sand mold support plate is loose. S3. If the sand layer is loose and shifted, the loose sand layer will be sucked away, and then the loose area will be sandblasted. After sandblasting, the adhesive will be sprayed and cured. Alternatively, if the sand layer is not loose, sandblasting can be performed on the already bonded sand layer, followed by re-application of adhesive. S4. Repeat steps S2-S3 until the sand mold is formed.

2. The printing method of a sand mold casting 3D printer according to claim 1, characterized by: Steps S1-S4 are performed using a sand casting 3D printer, which includes a glue spraying and sandblasting device, a detection component, and a sand suction component.

3. The sand cast 3D printer printing method according to claim 1, characterized in that: The adhesive spraying and sandblasting equipment includes a front-back moving assembly, a left-right moving assembly, a top-down moving assembly, a sandblasting head, an adhesive spraying head, and a rotating support platform. The sandblasting head and the adhesive spraying head are connected to the outward-facing side of the top-down moving assembly, with their output ends facing downwards. The top-down moving assembly drives the sandblasting head and the adhesive spraying head to move up and down, the left-right moving assembly drives the top-down moving assembly to move left and right, and the front-back moving assembly drives the left-right moving assembly to move back and forth. The rotating support platform is located below the output ends of the sandblasting head and the adhesive spraying head.

4. The sand mold 3D printer printing method according to claim 3, characterized by: The forward and backward moving assembly includes a support frame, forward and backward drive screws, and forward and backward moving seats. The forward and backward drive screws are rotatably connected to the support frame, and the forward and backward moving seats are provided with a first threaded hole, which is adapted to the forward and backward drive screws.

5. The sand mold 3D printer printing method of claim 3, wherein: The left and right moving assembly includes a left and right moving seat and a left and right driving screw. The left and right moving seat is provided with a second threaded hole, which is adapted to the left and right driving screw.

6. The printing method of the sand casting 3D printer according to claim 3, characterized in that: The up-and-down moving assembly includes an up-and-down moving base and an up-and-down driving screw. The up-and-down moving base is provided with a third threaded hole, which is adapted to the up-and-down driving screw.

7. The method of printing of a sand mold 3D printer according to claim 3, characterized in that: The rotating bearing platform includes a rotating disk, a connecting platform, and a rotating column. The rotating disk is rotatably connected to the surface of the connecting platform, and the rotating column is fixed to the side of the connecting platform and drives the connecting platform to rotate. The axis of the rotating disk and the axis of the rotating column are perpendicular to each other.

8. The method of printing of a sand mold 3D printer according to claim 2, characterized in that: The detection component includes a camera, a first lifting body, a first telescopic body, and an integrated infrared scanner. The camera is located on one side of the glue spraying and sandblasting equipment with its imaging end facing the working end of the equipment. The first lifting body drives the first telescopic body to move up and down. The integrated infrared scanner is connected to the output end of the first telescopic body, and the first telescopic body drives the integrated infrared scanner to scan the working end of the glue spraying and sandblasting equipment.

9. The method of printing of a sand mould 3D printer according to claim 8, characterized in that: The sand suction assembly includes a suction head, a second telescopic body, and a rotating body. The first lifting body drives the rotating body to move up and down. The first telescopic body and the second telescopic body are connected to the side wall of the rotating body. The suction head is connected to the output end of the second telescopic body.

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