Riser positioning seat mold and riser collaborative feeding process

Abstract

This invention belongs to the field of mold technology, specifically a riser positioning seat mold and a riser collaborative feeding process. The mold includes a mold structure. In this invention, a motor is started, which drives the connecting shaft connected to its output shaft to rotate the active bevel gear. This, in conjunction with the driven bevel gear, controls the synchronous rotation of four threaded rods, which in turn drives the outer slide block to move the lower mold. This causes the four lower molds to separate simultaneously, facilitating separation from the riser positioning seat produced by casting. Furthermore, by adjusting the extension of the first hydraulic telescopic rod, the push ring connected to its output end moves downward, making it easy to remove the cast riser positioning seat from the outside of the mold core, facilitating demolding. By designing the lower mold into four equal parts, damage and missing corners of the riser positioning seat can be effectively avoided, reducing the scrap rate. This invention is suitable for automated production in intelligent casting islands and improves the production efficiency of riser positioning seats.

Description

Technical Field

[0001] This invention belongs to the field of mold technology, specifically a riser positioning seat mold and a riser collaborative feeding process. Background Technology

[0002] Intelligent casting islands are integrated, highly efficient casting production units that combine automated pouring, intelligent mold closing, online inspection, and digital twin control. They enable continuous, unmanned production of castings from core making and forming to post-processing, and have become the mainstream manufacturing mode for high-end cast steel parts. A riser is a supplementary part added to the top or side of a casting to prevent defects. Functionally, in the mold, the riser cavity is a cavity that stores molten metal. It replenishes metal during casting formation, preventing shrinkage cavities and porosity, venting, and slag accumulation. The main function of a riser is feeding. The riser positioning seat is a core auxiliary component that forms the riser sleeve positioning groove in the mold, ensuring precise riser alignment and preventing misalignment and failure. It is a crucial foundation for stable production on intelligent casting islands.

[0003] Currently, the riser positioning seat molds used in intelligent casting islands still use traditional structures. The molds are mostly integral or large segmented, which makes it easy for the positioning seat to stick to the cavity after molding, making demolding difficult. This can easily cause product damage, missing corners, and a high scrap rate, thus failing to meet the requirements of automated and high-efficiency production in intelligent casting islands and reducing the production efficiency of riser positioning seats. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention proposes a riser positioning seat mold and a riser collaborative feeding process to solve the problems mentioned in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A riser positioning seat mold includes: a support structure including a base plate; a mold structure including an upper mold and four lower molds, the upper mold being disposed between the four lower molds, the bottom of each lower mold contacting the base plate; a demolding structure including a first demolding component and a second demolding component, the second demolding component being disposed on the base plate for controlling the opening and closing of the four lower molds; the first demolding component being disposed on the upper mold for assisting the second demolding component in demolding; a fixing structure disposed on the second demolding component for reinforcing the four lower molds; and an opening and closing structure disposed on the support structure for controlling the opening and closing between the upper mold and the lower molds.

[0007] According to the riser positioning seat mold provided by the present invention, the support structure further includes a support plate and a plurality of legs, each of the legs being connected to the base plate, and the base plate being connected to the support plate.

[0008] According to the present invention, a riser positioning seat mold is provided, wherein the opening and closing structure includes a second hydraulic telescopic rod and two guide plates. The second hydraulic telescopic rod is connected to the support plate, and the output end of the second hydraulic telescopic rod is connected to the upper mold. The upper mold is connected to the guide plates, and the guide plates are slidably connected to the support plate.

[0009] According to a riser positioning seat mold provided by the present invention, the first demolding assembly includes a push ring, two first hydraulic telescopic rods and an annular groove. Each first hydraulic telescopic rod is fixed inside the upper mold, and the output end of the first hydraulic telescopic rod is connected to the push ring. The push ring is located inside the annular groove, and the annular groove is formed on the upper mold.

[0010] According to the riser positioning seat mold provided by the present invention, the mold structure further includes multiple protrusions, a mold core, four sealing protrusions, four mating grooves, four sealing recesses, a connector, a liquid inlet, and a vent. The liquid inlet and the vent are both opened on the upper mold. The protrusions and the mold core are both connected to the upper mold. The connector is inserted into the mating groove. The mating groove is opened on the lower mold. The lower mold is connected to the sealing protrusions. The sealing protrusions engage with the sealing recesses. The sealing recesses are opened on the lower mold.

[0011] According to a riser positioning seat mold provided by the present invention, the second demolding assembly includes four slide rails, four slide blocks, four threaded rods, a motor, a connecting shaft, a lower bracket, a driving bevel gear, four driven bevel gears, and a receiving groove. The output shaft of the motor is connected to the connecting shaft, the connecting shaft is connected to the driving bevel gear, the driving bevel gear meshes with the driven bevel gear, the driven bevel gear is connected to the threaded rod, the threaded rod is rotatably connected to the slide rail, the slide rail is opened on the base plate, the threaded rod is screwed to the slide block, the slide block is connected to the lower mold, the driving bevel gear and the driven bevel gear are both disposed in the receiving groove, the receiving groove is opened on the base plate, and the base plate is connected to the motor through the lower bracket.

[0012] According to the present invention, a riser positioning seat mold is provided, wherein the fixing component includes a positioning boss, a locking block and a third hydraulic telescopic rod, the lower bracket is connected to the third hydraulic telescopic rod, the output end of the third hydraulic telescopic rod is connected to the locking block, the locking block is connected to the positioning boss, and the positioning boss is connected to the connecting shaft.

[0013] A riser-assisted feeding process includes the following steps:

[0014] S1. Setting the riser position: Precisely place the riser at the highest and thickest point of the casting to ensure that the feeding channel directly covers the key areas that are prone to porosity.

[0015] S2. Determine the riser size;

[0016] S3. Design riser spacing.

[0017] According to the riser-assisted feeding process provided by the present invention, step S2 further includes: based on the maximum wall thickness of the casting, using a calculation method combining the modulus method, the proportional method and the feeding liquid volume method, the riser diameter is determined by a coefficient of 1.45, with the diameter of the hot spot circle at the thickest part of the casting as the benchmark; this avoids the riser diameter being too small, which would cause looseness at the connection between the casting and the riser, while also preventing the riser from being too large, which would reduce the yield and increase the cost.

[0018] According to the riser-assisted feeding process provided by the present invention, step S3 further includes the following steps:

[0019] S31. Clearly define the riser placement area as riser zone, intermediate zone and end zone. When calculating riser spacing, deduct the distance of the intermediate zone to ensure the effectiveness of feeding.

[0020] S32. Rod-type castings: when chills are not available When placing a chill between two risers, For plate castings: without chills, the feeding distance = riser area + end area = 4 × casting wall thickness; when chills are placed between two risers, the feeding distance = riser area + end area = 10 × casting wall thickness.

[0021] S33. Multiple risers are used for coordinated feeding, and the distribution of risers is precisely controlled by the spacing formula to achieve uniform feeding of the entire casting.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. This invention starts a motor, which drives the connecting shaft connected to its output shaft to rotate the active bevel gear. In conjunction with the driven bevel gear, it controls the synchronous rotation of four threaded rods, which in turn drives the outer slide to move the lower mold. This causes the four lower molds to separate simultaneously, facilitating separation from the riser positioning seat produced by casting. Furthermore, by adjusting the extension of the first hydraulic telescopic rod, the push ring connected to its output end moves downward, making it easy to remove the riser positioning seat from the outside of the mold core, facilitating demolding. By designing the lower mold into four equal parts, damage and missing corners of the riser positioning seat can be effectively avoided, reducing the scrap rate. It is suitable for automated production in intelligent casting islands and improves the production efficiency of riser positioning seats.

[0024] 2. This invention fills the theoretical gap in the process guidance for CB2, supercritical, and ordinary supercritical high-chromium alloy heat-resistant steel castings, providing a scientific basis for the production of similar special material castings; it effectively controls the axial porosity defect of castings, significantly improves the density of castings, and ensures that no porosity defects are detected by non-destructive testing, reducing the risk of crack formation; it optimizes the riser size design, avoids material waste, improves the casting yield, and reduces production costs; it enhances the load-bearing capacity of castings under high temperature and high pressure environments, ensuring the operational stability and service life of key components such as the high-pressure outer cylinder and intermediate-pressure inner cylinder of steam turbines. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is an overall perspective view of a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the first angle of the connection between the lower mold and the base plate in a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of a second angle of connection between the lower mold and the base plate in a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention.

[0029] Figure 4 This is a three-dimensional structural diagram of the connection between the slide and the base plate in a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention.

[0030] Figure 5 This is a three-dimensional structural diagram of the connection between the riser positioning seat mold and the riser collaborative feeding process provided in an embodiment of the present invention, showing the connection between the connecting shaft and the clamping block.

[0031] Figure 6 This is a perspective view of a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention, including a positioning boss and a locking block;

[0032] Figure 7 This is a three-dimensional structural diagram of the connection between the upper mold, mold core, and lower mold of a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention;

[0033] Figure 8 This is a three-dimensional structural diagram of the connection between two lower molds in a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention.

[0034] Figure 9This is a schematic diagram of the first angle of the connection between the mold core and the upper mold in a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention.

[0035] Figure 10 This is a schematic diagram of a second angle of connection between the mold core and the upper mold in a riser positioning seat mold and a riser collaborative feeding process provided in an embodiment of the present invention.

[0036] In the diagram: 1. Support leg; 2. Base plate; 3. Support plate; 4. First hydraulic telescopic rod; 5. Guide plate; 6. Second hydraulic telescopic rod; 7. Lower mold; 8. Slide rail; 9. Slide seat; 10. Threaded rod; 11. Push ring; 12. Motor; 13. Connecting shaft; 14. Lower support; 15. Driving bevel gear; 16. Driven bevel gear; 17. Receiving groove; 18. Positioning boss; 19. Locking block; 20. Third hydraulic telescopic rod; 21. Upper mold; 22. Liquid inlet; 23. Protrusion; 24. Mold core; 25. Sealing protrusion; 26. Butt joint groove; 27. Sealing groove; 28. Annular groove; 29. ​​Joint; 30. Vent hole. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] Example 1:

[0039] like Figures 1 to 10 As shown, an embodiment of the present invention provides a riser positioning seat mold, comprising: a support structure including a base plate 2; a mold structure including an upper mold 21 and four lower molds 7, the upper mold 21 being disposed between the four lower molds 7, the bottom of each lower mold 7 being in contact with the base plate 2; a demolding structure including a first demolding component and a second demolding component, the second demolding component being disposed on the base plate 2 for controlling the opening and closing of the four lower molds 7; the first demolding component being disposed on the upper mold 21 for assisting the second demolding component in demolding; a fixing structure disposed on the second demolding component for reinforcing the four lower molds 7; and an opening and closing structure disposed on the support structure for controlling the opening and closing between the upper mold 21 and the lower molds 7.

[0040] In this embodiment, by starting the motor 12, the connecting shaft 13 connected to its output shaft drives the active bevel gear 15 to rotate, which works in conjunction with the driven bevel gear 16 to control the synchronous rotation of the four threaded rods 10. This, in turn, drives the outer slide block 9 to move the lower mold 7, thereby causing the four lower molds 7 to separate and disperse simultaneously, facilitating separation from the riser positioning seat generated by casting. Furthermore, by adjusting the extension of the first hydraulic telescopic rod 4, the push ring 11 connected to its output end moves downward, making it easy to remove the riser positioning seat generated by casting from the outside of the mold core 24, facilitating demolding. Moreover, by designing the lower mold 7 into four equal parts, damage and missing corners of the riser positioning seat can be effectively avoided, reducing the scrap rate. This is suitable for automated production in intelligent casting islands and improves the production efficiency of the riser positioning seat.

[0041] like Figure 1 As shown in this embodiment, preferably, the support structure also includes a support plate 3 and multiple legs 1. Each leg 1 is connected to the base plate 2. The support legs 1 can be used to support the mold to the required height. The base plate 2 is connected to the support plate 3.

[0042] like Figure 1 As shown, in this embodiment, preferably, the opening and closing structure includes a second hydraulic telescopic rod 6 and two guide plates 5. The second hydraulic telescopic rod 6 is connected to the support plate 3, and the output end of the second hydraulic telescopic rod 6 is connected to the upper mold 21. The upper mold 21 is connected to the guide plates 5, and the guide plates 5 are slidably connected to the support plate 3. By activating the second hydraulic telescopic rod 6, the upper mold 21 connected to its output end is driven to rise and fall, and the opening and closing state between the upper mold 21 and the lower mold 7 can be controlled. The sliding connection between the guide plates 5 and the support plate 3 can enhance the stability of the moving upper mold 21.

[0043] like Figure 7 and Figure 10 As shown, in this embodiment, preferably, the first demolding assembly includes a push ring 11, two first hydraulic telescopic rods 4, and an annular groove 28. Each first hydraulic telescopic rod 4 is fixed inside the upper mold 21, and the output end of the first hydraulic telescopic rod 4 is connected to the push ring 11. The push ring 11 is located inside the annular groove 28, which is opened on the upper mold 21. The first demolding assembly can assist the second demolding assembly in demolding. By activating the first hydraulic telescopic rod 4, the push ring 11 connected to its output end is driven to move downward, thereby pushing the riser positioning seat away from the outside of the mold core 24 and the connector 29.

[0044] like Figure 7 and Figure 9As shown, in this embodiment, preferably, the mold structure further includes multiple protrusions 23, a mold core 24, four sealing protrusions 25, four mating grooves 26, four sealing recesses 27, a connector 29, a liquid inlet 22, and a vent 30. The liquid inlet 22 and the vent 30 are both located on the upper mold 21. The multiple protrusions 23 can form fixing holes to fix themselves when the riser positioning seat is processed. The protrusions 23 and the mold core 24 are both connected to the upper mold 21. The connector 29 is inserted into the mating groove 26. The mating groove 26 is located on the lower mold 7. The lower mold 7 is connected to the sealing protrusions 25. The sealing protrusions 25 engage with the sealing recesses 27. The sealing recesses 27 are located on the lower mold 7. The sealing protrusions 25 and the sealing recesses 27 can enhance the sealing performance of the connection between the four lower molds 7.

[0045] like Figure 3 As shown, in this embodiment, preferably, the second demolding assembly includes four slide rails 8, four slide blocks 9, four threaded rods 10, a motor 12, a connecting shaft 13, a lower bracket 14, a driving bevel gear 15, four driven bevel gears 16, and a receiving groove 17. The output shaft of the motor 12 is connected to the connecting shaft 13, the connecting shaft 13 is connected to the driving bevel gear 15, the driving bevel gear 15 meshes with the driven bevel gear 16, the driven bevel gear 16 is connected to the threaded rods 10, the threaded rods 10 are rotatably connected to the slide rails 8, the slide rails 8 are opened on the base plate 2, the threaded rods 10 are screwed to the slide blocks 9, the slide blocks 9 are connected to the lower mold 7, the driving bevel gears 15 and the driven bevel gears 16 are both set in the receiving grooves 17, the receiving grooves 17 are opened on the base plate 2, the base plate 2 is connected to the motor 12 through the lower bracket 14, and the motor 12 can be installed and fixed using the lower bracket 14.

[0046] like Figure 5 As shown, in this embodiment, preferably, the fixing component includes a positioning boss 18, a locking block 19, and a third hydraulic telescopic rod 20. The lower bracket 14 is connected to the third hydraulic telescopic rod 20, the output end of the third hydraulic telescopic rod 20 is connected to the locking block 19, the locking block 19 is connected to the positioning boss 18, and the positioning boss 18 is connected to the connecting shaft 13. By activating the third hydraulic telescopic rod 20, the locking block 19 connected to its output end is engaged with the positioning boss 18, thereby fixing the connecting shaft 13, preventing it from rotating, and enhancing the firmness of the connection between the four lower molds 7.

[0047] Example 2:

[0048] An embodiment of the present invention provides a riser-assisted feeding process, comprising the following steps:

[0049] S1. Setting the riser position: Precisely place the riser at the highest and thickest point of the casting to ensure that the feeding channel directly covers the key areas that are prone to porosity.

[0050] S2. Determine the riser size: Based on the maximum wall thickness of the casting, a calculation method combining the modulus method, the proportional method, and the feeding liquid volume method is adopted. The diameter of the hot spot circle at the thickest part of the casting is used as the benchmark, and the riser diameter is determined by a factor of 1.45. This avoids the riser diameter being too small, which would cause looseness at the connection between the casting and the riser, while also preventing the riser from being too large, which would reduce the yield and increase the cost.

[0051] S3. Design riser spacing:

[0052] S31. Clearly define the riser placement area as riser zone, intermediate zone and end zone. When calculating riser spacing, deduct the distance of the intermediate zone to ensure the effectiveness of feeding.

[0053] S32. Rod-type castings: when chills are not available When placing a chill between two risers, For plate castings: without chills, the feeding distance = riser area + end area = 4 × casting wall thickness; when chills are placed between two risers, the feeding distance = riser area + end area = 10 × casting wall thickness.

[0054] S33. Multiple risers are used for coordinated feeding. The distribution of risers is precisely controlled by the above spacing formula to achieve uniform feeding of the entire casting.

[0055] This embodiment fills the theoretical gap in the process guidance for CB2, supercritical, and ordinary supercritical high-chromium alloy heat-resistant steel castings, providing a scientific basis for the production of similar special material castings; it effectively controls the axial porosity defect of castings, significantly improves the density of castings, and shows no porosity defects after non-destructive testing, reducing the risk of crack formation; it optimizes the riser size design, avoids material waste, improves casting yield, and reduces production costs; it enhances the load-bearing capacity of castings under high temperature and high pressure environments, ensuring the operational stability and service life of key components such as the high-pressure outer cylinder and intermediate-pressure inner cylinder of steam turbines.

[0056] The working principle of this invention is as follows:

[0057] In use, firstly, the insulating liquid material for the casting riser positioning seat is added to the gap between the upper mold 21, the lower mold 7, and the mold core 24 through the liquid inlet 22. The mold is then tapped to promote the discharge of gas from the liquid through the vent 30. After the liquid solidifies, the motor 12 is started according to the preset timing sequence of the intelligent casting island. This drives the connecting shaft 13 connected to its output shaft to rotate the driving bevel gear 15, which in turn drives the threaded rod 10 connected through the driven bevel gear 16 to rotate. This causes the outer slide 9 to move the lower mold 7, separating the four lower molds 7 and allowing the lower mold 7 to be separated from the casting core. The generated riser positioning seat separates, and then the intelligent casting island control system commands the second hydraulic telescopic rod 6 to move the upper mold 21 connected to its output end upward, causing the mold core 24 to move upward. At this time, the joint 29 connected to the mold core 24 disengages from the inside of the docking groove 26, and the cast riser positioning seat is raised to a certain height. Finally, under intelligent linkage control, the first hydraulic telescopic rod 4 is activated to extend it, causing the push ring 11 connected to its output end to push the cast riser positioning seat away from the upper mold 21 and away from the outside of the mold core 24, completing the fully automatic demolding process of the intelligent casting island and realizing unmanned continuous production.

[0058] In the riser-assisted feeding process, the riser is first placed at the highest and thickest point of the casting (hot spot zone). The gravity of the molten metal forms a natural feeding channel, prioritizing the replenishment of molten metal to the hot spot zone where solidification is slowest and most prone to porosity. This prevents the formation of voids in this area due to metal shrinkage during solidification. The riser diameter is then designed to be 1.45 times the diameter of the hot spot circle in the casting. This ensures a precise match between the riser's molten metal storage capacity and solidification rate and the shrinkage requirements of the hot spot zone. This guarantees that the riser solidifies later than the casting, continuously providing feeding molten metal, while avoiding excessively large risers that would waste material. This achieves a balance between feeding effectiveness and production efficiency. To balance efficiency, the final step is to control the distance between risers to avoid areas prone to porosity: the riser arrangement area is divided into riser zone, intermediate porosity zone, and end zone. When calculating the riser spacing, the intermediate zone, which is prone to porosity, is deducted. At the same time, the effective feeding distance is quantitatively designed according to the casting type (rod / plate) and whether chills are placed. By using multiple risers (≥2) in a coordinated layout, the effective feeding range of each riser is connected to each other, covering the entire casting, avoiding axial porosity caused by insufficient feeding distance. Meanwhile, the setting of chills can accelerate the local solidification speed, forming an artificial end zone, further expanding the effective feeding range and improving the density of the casting.

[0059] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A riser positioning seat mold, characterized in that, include: The support structure includes a base plate (2); The mold structure includes an upper mold (21) and four lower molds (7), wherein the upper mold (21) is disposed between the four lower molds (7), and the bottom of each lower mold (7) is in contact with the base plate (2); The demolding structure includes a first demolding component and a second demolding component. The second demolding component is disposed on the base plate (2) and is used to control the opening and closing of the four lower molds (7). The first demolding component is disposed on the upper mold (21) and is used to assist the second demolding component in demolding. A fixing structure is provided on the second demolding assembly to reinforce the four lower molds (7); An opening and closing structure is provided on the support structure to control the opening and closing between the upper mold (21) and the lower mold (7).

2. The riser positioning seat mold according to claim 1, characterized in that, The support structure also includes a support plate (3) and multiple legs (1), each of the legs (1) being connected to the base plate (2), and the base plate (2) being connected to the support plate (3).

3. The riser positioning seat mold according to claim 2, characterized in that, The opening and closing structure includes a second hydraulic telescopic rod (6) and two guide plates (5). The second hydraulic telescopic rod (6) is connected to the support plate (3), and the output end of the second hydraulic telescopic rod (6) is connected to the upper mold (21). The upper mold (21) is connected to the guide plate (5), and the guide plate (5) is slidably connected to the support plate (3).

4. The riser positioning seat mold according to claim 1, characterized in that, The first demolding assembly includes a push ring (11), two first hydraulic telescopic rods (4) and an annular groove (28). Each first hydraulic telescopic rod (4) is fixed inside the upper mold (21), and the output end of the first hydraulic telescopic rod (4) is connected to the push ring (11). The push ring (11) is located inside the annular groove (28), which is opened on the upper mold (21).

5. A riser positioning seat mold according to claim 1, characterized in that, The mold structure also includes multiple protrusions (23), mold core (24), four sealing protrusions (25), four docking grooves (26), four sealing recesses (27), connectors (29), liquid inlet (22), and vent (30). The liquid inlet (22) and the vent (30) are both located on the upper mold (21). The protrusions (23) and the mold core (24) are both connected to the upper mold (21). The connector (29) is inserted into the docking groove (26). The docking groove (26) is located on the lower mold (7). The lower mold (7) is connected to the sealing protrusions (25). The sealing protrusions (25) engage with the sealing recesses (27). The sealing recesses (27) are located on the lower mold (7).

6. A riser positioning seat mold according to claim 1, characterized in that, The second demolding assembly includes four slide rails (8), four slide blocks (9), four threaded rods (10), a motor (12), a connecting shaft (13), a lower bracket (14), a driving bevel gear (15), four driven bevel gears (16), and a receiving groove (17). The output shaft of the motor (12) is connected to the connecting shaft (13), the connecting shaft (13) is connected to the driving bevel gear (15), the driving bevel gear (15) meshes with the driven bevel gears (16), and the driven bevel gears (16) mesh with the threaded rods (17). The threaded rod (10) is rotatably connected to the slide rail (8), which is located on the base plate (2). The threaded rod (10) is screwed to the slide block (9), which is connected to the lower mold (7). The driving bevel gear (15) and the driven bevel gear (16) are both located in the receiving groove (17), which is located on the base plate (2). The base plate (2) is connected to the motor (12) via the lower bracket (14).

7. A riser positioning seat mold according to claim 6, characterized in that, The fixing assembly includes a positioning boss (18), a locking block (19), and a third hydraulic telescopic rod (20). The lower bracket (14) is connected to the third hydraulic telescopic rod (20). The output end of the third hydraulic telescopic rod (20) is connected to the locking block (19). The locking block (19) is connected to the positioning boss (18). The positioning boss (18) is connected to the connecting shaft (13).

8. A riser-assisted feeding process, applied to a riser positioning seat mold as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Setting the riser position: Precisely place the riser at the highest and thickest point of the casting to ensure that the feeding channel directly covers the key areas that are prone to porosity. S2. Determine the riser size; S3. Design riser spacing.

9. The riser-assisted feeding process according to claim 8, characterized in that, The S2 step also includes: based on the maximum wall thickness of the casting, a calculation method combining the modulus method, the proportional method and the feeding liquid volume method is used to determine the riser diameter with the diameter of the hot spot circle at the thickest part of the casting as the benchmark, and a coefficient of 1.45 is applied; this avoids the riser diameter being too small, which would cause the connection between the casting and the riser to be loose, while also preventing the riser from being too large, which would reduce the yield and increase the cost.

10. The riser-assisted feeding process according to claim 8, characterized in that, Step S3 also includes the following steps: S31. Clearly define the riser placement area as riser zone, intermediate zone and end zone. When calculating riser spacing, deduct the distance of the intermediate zone to ensure the effectiveness of feeding. S32. Rod-type castings: when chills are not available When placing a chill between two risers, For plate castings: without chills, the feeding distance = riser area + end area = 4 × casting wall thickness; when chills are placed between two risers, the feeding distance = riser area + end area = 10 × casting wall thickness. S33. Multiple risers are used for coordinated feeding, and the distribution of risers is precisely controlled by the spacing formula to achieve uniform feeding of the entire casting.

Images