Combined modeling device and method for complex volute part

Abstract

The invention belongs to the technical field of casting, and particularly relates to a combined molding device and method.The combined molding device comprises a sand mold body, a conveying assembly and a transferring assembly, the sand mold body comprises an upper mold, a middle mold and a lower mold, and the conveying assembly comprises a first conveying belt, a second conveying belt and a third conveying belt; the second conveying belt and the third conveying belt are located on the two sides of the first conveying belt respectively and are perpendicular to the first conveying belt, positioning protruding blocks are arranged on the surfaces of the first conveying belt, the second conveying belt and the third conveying belt and used for positioning the upper mold, the middle mold and the lower mold, the first conveying belt is used for conveying the lower mold, and the third conveying belt is used for conveying the lower mold. The second conveying belt is used for conveying medium-sized products, the third conveying belt is used for conveying upper-sized products, and the transferring assembly comprises two manipulators fixed to the two sides of the first conveying belt. Classified machining is adopted, manufacturing of molds is saved, the production cost is reduced, and the assembling efficiency and the positioning precision during assembling are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of casting, and particularly relates to a combined modeling device and method for complex volute parts. Background Art

[0002] Resin sand modeling is a casting process using resin as a binder, widely used in the production of complex castings. Its core is to form a high-strength sand mold through chemical reactions or physical actions between resin and sand grains, suitable for high-precision, thin-walled, complex-structured castings such as volute parts.

[0003] Currently, there are usually three methods for resin sand modeling. The first is the traditional modeling method. First, a mold is made, usually made of a wooden mold or an aluminum mold, and the mold is used to turn over the sand for modeling. The second uses a moldless machining method, without making a mold. The three-dimensional modeling design of the part is carried out through CAD software, and the model is subtracted and split into an upper mold model, a lower mold model, a core model, etc. Finally, the main shaft of the numerical control machining equipment drives the tool for cutting machining to complete the machining of each part of the sand mold. The third directly uses 3D printing to form.

[0004] The existing devices still have the following deficiencies:

[0005] 1. In the above existing resin sand modeling methods, the first method requires mold opening, with a long mold production cycle and high costs. The second method of moldless machining of the sand mold requires considering the parting and draft angles of the 3D model, and cores need to be made at local reverse draft positions. The third method directly uses 3D printing to form, without mold opening and without considering the draft angle of the model, but the molding sand for 3D printing is expensive and the production cost is high.

[0006] 2. In the actual continuous production of the second resin sand modeling method, when assembling the upper mold model, the lower mold model, and the core model, a robotic arm is required to clamp each model to the assembly table for assembly. For example, in a casting sand box automatic positioning and closing device disclosed in Publication No. CN109909484B, through a two-way vision detection device, visual photography is respectively carried out on the upper sand box and the lower sand box to detect the position of the sand box positioning pins, and then the four-axis moving device is moved to realize the positioning and closing of the upper sand box and the lower sand box of the sand box. The positioning method is relatively cumbersome and the equipment cost is high. In addition, usually, the diameter of the pin hole is larger than the diameter of the positioning pin, and there is a gap between the positioning pin and the pin hole after closing the box, so relative displacement can occur between the upper sand box and the lower sand box, resulting in the possibility of misalignment between the upper sand box and the lower sand box. Summary of the Invention

[0007] The purpose of the present invention is to provide a combined modeling device and method for complex volute parts for the problems raised in the above background art.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A combined modeling device for complex volute parts, comprising:

[0009] A sand mold body, the sand mold body includes an upper mold, a middle mold and a lower mold;

[0010] A conveying assembly, the conveying assembly includes a first conveyor belt, a second conveyor belt and a third conveyor belt. The second conveyor belt and the third conveyor belt are respectively located on both sides of the first conveyor belt and perpendicular to the first conveyor belt. Positioning bumps are provided on the surfaces of the first conveyor belt, the second conveyor belt and the third conveyor belt. The positioning bumps are used to position the upper mold, the middle mold and the lower mold. The first conveyor belt is used to convey the lower mold, the second conveyor belt is used to convey the middle mold, and the third conveyor belt is used to convey the upper mold;

[0011] A transfer assembly, the transfer assembly includes two manipulators fixed on both sides of the first conveyor belt. The two manipulators are used to transfer the middle mold and the upper mold above the first conveyor belt and assemble them with the lower mold.

[0012] Further, the manipulator includes a support assembly and a transfer assembly. The support assembly includes support plates fixed on both sides of the first conveyor belt. Support rods are provided below the support plates. The two ends of the support rods are respectively fixed on the bottom of the support plates and the side walls of the first conveyor belt.

[0013] Further, the transfer assembly includes a first electric slide rail fixed on the upper surface of the support plate. A movable seat adapted to it is provided on the first electric slide rail. The transfer assembly further includes a flipping component and a clamping component fixed on the movable seat.

[0014] Further, the flipping component includes a flipping shaft rotatably connected to the movable seat. U-shaped grooves are respectively provided on the first electric slide rail and the support plate. The two U-shaped grooves are of the same size and their central axes are collinear. The flipping shaft passes through the two U-shaped grooves and extends below the support plate. A column gear is provided at the bottom end of the flipping shaft. A rack adapted to the column gear is provided on the support plate.

[0015] Further, the clamping component includes a second electric slide rail fixed on the top end of the flipping shaft. Two symmetrically arranged sliders adapted to it are provided on the second electric slide rail. Electric push rods are provided on both sliders. Claw jaws are provided at the output ends of the electric push rods.

[0016] Further, a plurality of positioning shafts are provided on the upper surface of the lower mold. Positioning through holes corresponding to the positions of the positioning shafts are provided on the middle mold. Positioning circular grooves corresponding to the positions of the positioning shafts are provided on the lower surface of the upper mold. The cross section of the positioning circular groove is convex.

[0017] Further, a fixed ring and a movable ring are provided on the positioning shaft. A spring is provided between the fixed ring and the movable ring. The spring is sleeved on the positioning shaft. A plurality of connecting rods are rotatably fitted on both the fixed ring and the movable ring. One end of the connecting rod away from the positioning shaft is rotatably connected to an arc-shaped plate.

[0018] The present invention also provides a method for applying the combined modeling device for the above-mentioned complex volute parts, including the following steps:

[0019] S1. Subtract the sand mold body and split it into an upper mold, a middle mold, and a lower mold. The main body of the upper mold is a riser, the main body of the middle mold is a part model, and the main body of the lower mold is a bottom gating system;

[0020] S2. Save the STL file of the middle mold model and import it into the sand mold 3D printer for printing and forming. For the upper mold and the lower mold models, prefabricate sand blocks first. When 3D printing, reserve positioning through holes and bottom positioning grooves adapted to the positioning bumps on the middle mold;

[0021] S3. Save the upper mold and the lower mold models as STEP files, program them with programming software, and then input them into a numerical control machine tool to process the prefabricated sand blocks, and process the upper mold and the lower mold into shape. When processing the upper mold, reserve a positioning circular groove and a bottom positioning groove adapted to the positioning bump. When processing the lower mold, reserve a bottom positioning groove adapted to the positioning bump. After the lower mold is processed, install a positioning shaft on its upper surface;

[0022] S4. Place the upper mold, the middle mold, and the lower mold on the corresponding conveyor belts respectively. When placing, make the bottom positioning groove catch on the positioning bumps on the conveyor belts, and convey and assemble the upper mold, the middle mold, and the lower mold through the conveying component and the transfer component.

[0023] Compared with the existing technology, the advantages of the present invention are as follows:

[0024] 1. The present invention splits the sand mold body into an upper mold, a middle mold, and a lower mold. For the middle mold with a complex structure, directly adopt 3D printing and forming, and for the two non-critical parts of the upper mold and the lower mold, adopt moldless machining and forming, saving the production of molds, reducing production costs, and ensuring product quality.

[0025] 2. When assembling the sand mold, the present invention uses two manipulators to be dedicated to the middle mold and the upper mold respectively. When the manipulator transfers, while the turning shaft moves horizontally, it completes a 180° flip, effectively improving the transfer efficiency of the middle mold and the upper mold, and further improving the assembly efficiency of the sand mold.

[0026] 3. When assembling the middle mold in the sand mold assembly, the positioning shaft passes through the positioning through-hole. When assembling the upper mold, the positioning shaft is inserted into the lower section of the positioning circular groove to complete the preliminary positioning. As the upper mold continues to move downward, when the end of the positioning shaft is inserted into the upper section of the convex positioning circular groove, the positioning groove restricts the upward movement of the movable ring, causing the spring to be compressed. As a result, multiple arc-shaped plates expand radially along the positioning shaft. When the arc-shaped plates are in contact with the side wall of the positioning through-hole and the side wall of the lower section of the positioning circular groove, the positioning through-hole and the positioning circular groove are coaxial with the positioning shaft, completing the precise positioning. At this time, there is no relative displacement between the upper mold, the middle mold, and the lower mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a combined modeling device for a complex volute part provided by the present invention;

[0028] Figure 2 FIG. 2 is a schematic diagram of the manipulator structure of a combined modeling device for a complex volute part provided by the present invention;

[0029] Figure 3 FIG. 3 is a schematic diagram of the lower mold structure of a combined modeling device for a complex volute part provided by the present invention;

[0030] Figure 4 FIG. 4 is a schematic diagram of the positioning shaft structure of a combined modeling device for a complex volute part provided by the present invention;

[0031] Figure 5 FIG. Figure 4 is an enlarged view of part A in FIG.

[0032] Figure 6 FIG. 5 is a schematic diagram of the structure during the assembly of the upper mold of a combined modeling device for a complex volute part provided by the present invention;

[0033] Figure 7 FIG. Figure 6 is an enlarged view of part B in FIG.

[0034] Figure 8 FIG. 6 is a flowchart of a combined modeling method for a complex volute part provided by the present invention.

[0035] In the figures, 11 is the upper mold, 12 is the middle mold, 13 is the lower mold, 111 is the positioning circular groove, and 121 is the positioning through-hole;

[0036] 21 is the first conveyor belt, 22 is the second conveyor belt, 23 is the third conveyor belt, and 3 is the positioning convex block;

[0037] 41 is the support plate and 42 is the support rod;

[0038] 51 is the first electric slide rail, 52 is the movable seat, 53 is the turning shaft, 531 is the column gear, 532 is the rack, 54 is the second electric slide rail, 541 is the slider, 542 is the electric push rod, and 543 is the jaw.

[0039] 6 Manipulator, 61 Fixed Ring, 62 Movable Ring, 63 Spring, 64 Connecting Rod, 65 Arc Plate;

[0040] 7 Positioning Shaft. Specific Embodiment

[0041] The following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0042] As Figures 1 - 7 shown, a combined modeling device for a complex volute part includes a sand mold body, a conveying component, and a transfer component. The sand mold body includes an upper mold 11, a middle mold 12, and a lower mold 13. A plurality of positioning shafts 7 are provided on the upper surface of the lower mold 13. Positioning through holes 121 corresponding to the positions of the positioning shafts 7 are provided on the middle mold 12. Positioning circular grooves 111 corresponding to the positions of the positioning shafts 7 are provided on the lower surface of the upper mold 11. The cross-section of the positioning circular groove 111 is convex. A fixed ring 61 and a movable ring 62 are provided on the positioning shaft 7. A spring 63 is provided between the fixed ring 61 and the movable ring 62. The spring 63 is sleeved on the positioning shaft 7. A plurality of connecting rods 64 are rotatably fitted on both the fixed ring 61 and the movable ring 62. One end of the connecting rod 64 away from the positioning shaft 7 is rotatably connected to an arc plate 65;

[0043] Specifically, the diameter of the lower section of the positioning circular groove 111 is the same as the diameter of the positioning through hole 121. In the natural state of the spring 63, the diameter of the positioning through hole 121 is larger than the outer diameter of the arc plate 65. When assembling the middle mold 12, the positioning shaft 7 can easily pass through the positioning through hole 121 to perform preliminary positioning on the middle mold 12 without damaging the middle mold 12. And the diameter of the upper section of the positioning circular groove 111 is larger than the diameter of the positioning shaft 7 and smaller than the diameter of the movable ring 62;

[0044] During specific operation, first assemble the middle mold through the manipulator 6. When assembling, the positioning shaft 7 passes through the positioning through hole 121 to complete the preliminary positioning of the middle mold. When assembling the upper mold 11, the top end of the positioning shaft 7 can be inserted into the upper section of the positioning circular groove 111, while the movable ring 62 is restricted in the lower section of the positioning circular groove 111, that is, the movable ring 62 moves downward relative to the positioning shaft 7. Thus, under the action of the connecting rod 64, the arc plate 65 expands radially along the positioning shaft 7. When the arc plate 65 is in contact with the side wall of the positioning through hole 121 and the side wall of the lower section of the positioning circular groove 111, the positioning through hole 121, the positioning circular groove 111, and the positioning shaft 7 are in a coaxial state, completing the precise positioning of the upper mold 11, the middle mold 12, and the upper mold 11. And at this time, no relative displacement can occur between the upper mold 11, the middle mold 12, and the lower mold 13. The positioning is more accurate and the positioning cost is low;

[0045] The conveying assembly includes a first conveyor belt 21, a second conveyor belt 22 and a third conveyor belt 23. The second conveyor belt 22 and the third conveyor belt 23 are respectively located on both sides of the first conveyor belt 21 and perpendicular to the first conveyor belt 21. The first conveyor belt 21, the second conveyor belt 22 and the third conveyor belt 23 are all intermittently conveyed and have the same conveying frequency. Positioning bumps 3 are provided on the surfaces of the first conveyor belt 21, the second conveyor belt 22 and the third conveyor belt 23. The positioning bumps 3 are used to position the upper mold 11, the middle mold 12 and the lower mold 13. The first conveyor belt 21 is used to convey the lower mold 13, the second conveyor belt 22 is used to convey the middle mold 12, and the third conveyor belt 23 is used to convey the upper mold 11;

[0046] During specific operation, the upper mold 11, the middle mold 12 and the lower mold 13 are respectively placed on the corresponding conveyor belts. When placing, the bottom positioning grooves of the upper mold 11, the middle mold 12 and the lower mold 13 are stuck on the positioning bumps 3. The positioning bumps 3 can ensure that there is no relative displacement between the upper mold 11, the middle mold 12 and the lower mold 13 and the conveyor belts during transportation, so as to ensure that when the manipulator 6 clamps the middle mold 12 and the upper mold 11 above the first conveyor belt 21, the middle mold 12 and the upper mold 11 can be directly installed without the need to adjust the positions of the middle mold 12 and the upper mold 11, effectively improving the assembly efficiency;

[0047] The transfer assembly includes two manipulators 6 fixed on both sides of the first conveyor belt 21. The two manipulators 6 are used to transfer the middle mold 12 and the upper mold 11 above the first conveyor belt 21 and assemble them with the lower mold 13. The manipulator 6 includes a support assembly and a transfer assembly. The support assembly includes support plates 41 fixed on both sides of the first conveyor belt 21. A support rod 42 is provided below the support plate 41. The two ends of the support rod 42 are respectively fixed on the bottom of the support plate 41 and the side wall of the first conveyor belt 21. Specifically, mounting seats are provided on the bottom of the support plate 41 and the side wall of the first conveyor belt 21. The two ends of the support rod 42 are detachably fixed on the bottom of the support plate 41 and the side wall of the first conveyor belt 21 by screws. The transfer assembly includes a first electric slide rail 51 fixed on the upper surface of the support plate 41. A movable seat 52 adapted to it is provided on the first electric slide rail 51. The transfer assembly further includes a flipping component and a clamping component fixed on the movable seat 52;

[0048] The flipping component includes a flipping shaft 53 rotatably connected to the movable seat 52. U-shaped grooves are provided on both the first electric slide rail 51 and the support plate 41. The two U-shaped grooves are of the same size and their central axes are collinear. The flipping shaft 53 passes through the two U-shaped grooves and extends below the support plate 41. A column gear 531 is provided at the bottom end of the flipping shaft 53, and a rack 532 adapted to the column gear 531 is provided on the support plate 41. Specifically, when the movable seat 52 drives the flipping shaft 53 to move along the first electric slide rail 51, under the action of the rack 532 and the column gear 531, the flipping shaft 53 rotates 180°. While the flipping shaft 53 moves horizontally, it also flips, effectively improving the transfer efficiency of the manipulator 6, and thus improving the assembly efficiency of the sand mold. In addition, when the movable seat 52 is stationary, the rack 532 also plays a limiting role on the flipping shaft 53;

[0049] The clamping component includes a second electric slide rail 54 fixed to the top end of the flipping shaft 53. Two symmetrically arranged sliders 541 adapted to the second electric slide rail 54 are provided on the second electric slide rail 54. Electric push rods 542 are provided on both sliders 541, and clamping jaws 543 are provided at the output ends of the electric push rods 542. Specifically, the clamping jaws 543 are flexible clamping jaws to avoid causing secondary damage to the middle mold 12 or the upper mold 11 during clamping;

[0050] As Figure 8 shown, the present invention also provides a method for applying the combined molding device for the above-mentioned complex volute parts, including the following steps:

[0051] S1. Subtract the sand mold body and split it into an upper mold 11, a middle mold 12, and a lower mold 13. The main body of the upper mold 11 is a riser, the main body of the middle mold 12 is a part model, and the main body of the lower mold 13 is a bottom gating system;

[0052] S2. Save the middle mold 12 model as an STL file and import it into the sand mold 3D printer for printing and forming. First, prefabricate sand blocks for the upper mold 11 and lower mold 13 models. When 3D printing, position through holes 121 are reserved on the middle mold, and bottom positioning grooves adapted to the positioning bumps 3 are reserved;

[0053] S3. Save the upper mold 11 and lower mold 13 models as STEP files, program them with programming software, and then input them into a numerical control machine tool to process the prefabricated sand blocks, and process the upper mold 11 and lower mold 13 into shape. When processing the upper mold 11, a positioning circular groove 111 and a bottom positioning groove adapted to the positioning bump 3 are reserved. When processing the lower mold 13, a bottom positioning groove adapted to the positioning bump 3 is reserved. After the lower mold 13 is processed, a positioning shaft 7 is installed on its upper surface;

[0054] S4. Place the upper mold 11, middle mold 12, and lower mold 13 on the corresponding conveyor belts respectively. When placing, make the bottom positioning grooves catch on the positioning bumps 3 on the conveyor belts, and convey and assemble the upper mold 11, middle mold 12, and lower mold 13 through the conveying component and the transfer component.

[0055] The working principle of the present invention is as follows:

[0056] After the upper mold 11, the middle mold 12, and the lower mold 13 are processed and formed, the upper mold 11, the middle mold 12, and the lower mold 13 are respectively placed on the corresponding conveyor belts. When placing, the bottom positioning grooves of the upper mold 11, the middle mold 12, and the lower mold 13 are stuck on the positioning bumps 3. The positioning bumps 3 can ensure that there is no relative displacement between the upper mold 11, the middle mold 12, and the lower mold 13 and the conveyor belts during transportation, so as to ensure that when the manipulator 6 clamps the middle mold 12 and the upper mold 11 above the first conveyor belt 21, the middle mold 12 and the upper mold 11 can be directly installed without the need to adjust the positions of the middle mold 12 and the upper mold 11, effectively improving the assembly efficiency.

[0057] After the conveyor belts transport the upper mold 11, the middle mold 12, and the lower mold 13 to the preset positions, first, the manipulator 6 assembles the middle mold. During assembly, the electric push rod 542 retracts to lower the clamping jaw 543. Subsequently, the second electric slide rail 54 controls the two sliders 541 to move closer to each other, so that the clamping jaw 543 clamps the middle mold 12. Then, the electric push rod 542 extends to lift the middle mold 12. Subsequently, the first electric slide rail 51 controls the movable seat 52 to horizontally move in the direction close to the first conveyor belt 21. The movable seat 52 drives the turning shaft 53 to horizontally move synchronously. At the same time, under the action of the rack 532 and the column gear 531, the turning shaft 53 rotates 180°. The turning shaft 53 flips while horizontally moving, effectively improving the transfer efficiency of the manipulator 6, and thus improving the assembly efficiency of the sand mold. In addition, when the movable seat 52 is stationary, the rack 532 also plays a limiting role on the turning shaft 53. After the middle mold 12 is transferred above the first conveyor belt 21, the electric push rod 542 retracts to lower the middle mold 12 for assembly. During assembly, the positioning shaft 7 passes through the positioning through hole 121 to complete the preliminary positioning of the middle mold 12. Subsequently, the second electric slide rail 54 controls the two sliders 541 to move away from each other to release the middle mold 12. The electric push rod 542 extends so that the clamping jaw is above the middle mold 12. Then, the first electric slide rail 51 controls the movable seat 52 to move away from the first conveyor belt 21 so that the clamping jaw 543 returns to the initial position.

[0058] Subsequently, the upper mold 11 is assembled by the manipulator 6. The transfer process of the upper mold 11 is the same as that of the middle mold 12, which will not be elaborated here. During assembly, as the upper mold 11 moves downward, the top of the positioning shaft 7 passes through the lower section of the positioning circular groove 111 and enters the upper section of the positioning circular groove 111. The movable ring 62 is restricted in the lower section of the positioning circular groove 111, so that the movable ring 62 moves downward relative to the positioning shaft 7. Under the action of the connecting rod 64, the arc-shaped plate 65 expands radially along the positioning shaft 7. When the arc-shaped plate 65 is in contact with the side wall of the positioning hole 121 and the side wall of the lower section of the positioning circular groove 111, the positioning through hole 121, the positioning circular groove 111 and the positioning shaft 7 are in a coaxial state, completing the precise positioning of the upper mold 11, the middle mold 12 and the lower mold 13. And at this time, no relative displacement can occur between the upper mold 11, the middle mold 12 and the lower mold 13, the positioning is more accurate and the positioning cost is low;

[0059] After the assembly of a sand mold is completed, the first conveyor belt 21, the second conveyor belt 22 and the third conveyor belt 23 run simultaneously once, and then the assembly of the next sand mold is carried out. The assembly does not require manual intervention and has a high degree of automation.

[0060] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined modeling device for a complex volute part, characterized in that Including: A sand mold body, which includes an upper mold (11), a middle mold (12), and a lower mold (13); A conveying assembly, which includes a first conveyor belt (21), a second conveyor belt (22), and a third conveyor belt (23). The second conveyor belt (22) and the third conveyor belt (23) are respectively located on both sides of the first conveyor belt (21) and are perpendicular to the first conveyor belt (21). Positioning bumps (3) are provided on the surfaces of the first conveyor belt (21), the second conveyor belt (22), and the third conveyor belt (23). The positioning bumps (3) are used to position the upper mold (11), the middle mold (12), and the lower mold (13). The first conveyor belt (21) is used to convey the lower mold (13), the second conveyor belt (22) is used to convey the middle mold (12), and the third conveyor belt (23) is used to convey the upper mold (11); A transfer assembly, which includes two manipulators (6) fixed on both sides of the first conveyor belt 2. The two manipulators (6) are used to transfer the middle mold (12) and the upper mold (11) above the first conveyor belt (21) and assemble them with the lower mold (13).

2. The combined modeling device for a complex volute part according to claim 1, characterized in that, The manipulator (6) includes a support assembly and a transfer assembly. The support assembly includes support plates (41) fixed on both sides of the first conveyor belt (21). A support rod (42) is provided below the support plates (41). The two ends of the support rod (42) are respectively fixed to the bottom of the support plates (41) and the side wall of the first conveyor belt (21).

3. The combined modeling device for a complex volute part according to claim 2, characterized in that The transfer assembly includes a first electric slide rail (51) fixed on the upper surface of the support plate (41). A movable seat (52) adapted to it is provided on the first electric slide rail (51). The transfer assembly further includes a flipping component and a clamping component fixed on the movable seat (52).

4. The combined modeling device for a complex volute part according to claim 3, characterized in that, The flipping component includes a flipping shaft (53) rotatably connected to the movable seat (52). U-shaped grooves are respectively opened on the first electric slide rail (51) and the support plate (41). The two U-shaped grooves are of the same size and their central axes are collinear. The flipping shaft (53) penetrates through the two U-shaped grooves and extends below the support plate (41). A column gear (531) is provided at the bottom end of the flipping shaft (53). A rack (532) adapted to the column gear (531) is provided on the support plate (41).

5. The combined modeling device for a complex volute part according to claim 3, characterized in that, The clamping component includes a second electric slide rail (54) fixed to the top end of the flipping shaft (53). Two symmetrically arranged sliders (541) adapted to it are provided on the second electric slide rail (54). Electric push rods (542) are provided on the two sliders (541). A clamping jaw (543) is provided at the output end of the electric push rod (542).

6. The combined modeling device for a complex volute part according to claim 1, characterized in that, A plurality of positioning shafts (7) are provided on the upper surface of the lower mold (13). Positioning through holes (121) corresponding to the positions of the positioning shafts (7) are provided on the middle mold (12). Positioning circular grooves (111) corresponding to the positions of the positioning shafts (7) are provided on the lower surface of the upper mold (11). The cross-section of the positioning circular groove (111) is convex.

7. The combined modeling device for a complex volute part according to claim 6, characterized in that, A fixed ring (61) and a movable ring (62) are provided on the positioning shaft (7). A spring (63) is provided between the fixed ring (61) and the movable ring (62). The spring (63) is sleeved on the positioning shaft (7). A plurality of connecting rods (64) are rotatably fitted on both the fixed ring (61) and the movable ring (62). One end of the connecting rod (64) away from the positioning shaft (7) is rotatably connected to an arc-shaped plate (65).

8. A method for a combined modeling device of the complex volute parts described in claims 1-7, characterized in that, It includes the following steps: S1. The sand mold body is subtracted and split into an upper mold (11), a middle mold (12) and a lower mold (13). The main body of the upper mold (11) is a riser, the main body of the middle mold (12) is a part model, and the main body of the lower mold (13) is a bottom gating system; S2. The middle mold (12) model is saved as an STL file and imported into a sand mold 3D printer for printing and forming. The upper mold (11) and lower mold (13) models are first prefabricated with sand blocks. When 3D printing, positioning through holes (121) and bottom positioning grooves adapted to the positioning bumps (3) are reserved on the middle mold; S3. The upper mold (11) and lower mold (13) models are saved as STEP files, programmed with programming software and then input into a numerical control machine tool to process the prefabricated sand blocks, and the upper mold (11) and lower mold (13) are processed and formed. When processing the upper mold (11), a positioning circular groove (111) and a bottom positioning groove adapted to the positioning bump (3) are reserved. When processing the lower mold (13), a bottom positioning groove adapted to the positioning bump (3) is reserved. After the lower mold (13) is processed, a positioning shaft (7) is installed on its upper surface; S4. The upper mold (11), the middle mold (12) and the lower mold (13) are respectively placed on corresponding conveyor belts. When placing, the bottom positioning grooves are stuck on the positioning bumps (3) on the conveyor belts, and the upper mold (11), the middle mold (12) and the lower mold (13) are conveyed and assembled through a conveying component and a transfer component.

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