A fan-shaped single-crystal structure casting gating system

Abstract

This invention belongs to the field of aero-engine component manufacturing technology, and specifically relates to a gating system for fan-shaped single-crystal structure castings. The system includes a main gating system and several individual wax pattern systems. Conformal anti-crack ribs are provided on both sides of the individual wax pattern systems. Support ribs are provided between the bottom gating and the base, and reinforced risers are provided between adjacent vent risers, improving the overall and local structural strength of the gating system and preventing fire during casting and crystallization. The distribution of components is designed according to the shape and structural characteristics of the fan-shaped single-crystal structure casting to ensure smooth flow of the high-temperature alloy liquid and sufficient feeding during solidification. For a fan-shaped single-crystal structure casting with a length of 108mm, a width of 69mm, and a height of 57mm, the dimensions of each part of the gating system are selected, increasing the product qualification rate from 5% to 50%, reducing the consumption of master alloy and production resources, improving the stability of casting quality, and increasing production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine component manufacturing technology, and specifically relates to a casting system for fan-shaped single-crystal structure castings. Background Technology

[0002] Investment casting technology is widely used in aero engines, especially in the structural components of the low-pressure turbine section. Due to the high operating temperature, complex component structure, and high dimensional accuracy requirements, precision casting is usually the only option. As engine operating temperatures continue to rise, conventional equiaxed crystal castings can no longer meet the performance requirements of engines, and single crystal casting is gradually being adopted for the structural components of the low-pressure turbine section.

[0003] The fan-shaped single-crystal structure casting is formed by single-crystal precision casting. It has a rotating flow channel surface, mounting edge, axial turntable and process hole. The wall thickness change ratio is as high as 30:3 and there are 7 wall thickness change areas. The overall structure is complex. Traditional single-crystal structure casting gating systems are difficult to guarantee the integrity of single crystals in fan-shaped single-crystal structure castings with complex structures. It is impossible to avoid defects such as impurities, shell expansion, fire run, and porosity that are prone to occur during the casting process. The scrap rate of castings is high, which consumes a lot of master alloy and production resources and has high manufacturing costs. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a casting system for fan-shaped single-crystal structure castings, including a main gating system and several individual wax model systems. The main gating system includes a pouring cup, a central column, a accumulator, and a base. The base is a circular disc structure, horizontally positioned at the bottom of the main gating system. The lower end of the central column is fixedly connected to the center of the base, and the central column is arranged perpendicular to the base. The top of the central column is connected to the accumulator, and the upper surface of the accumulator is connected to the pouring cup. The individual wax model systems include a crystallizer, a crystallization stage, and a component wax model connected sequentially from bottom to top. The upper end of each individual wax model system is connected to the pouring cup via a vent riser, and the lower end of the crystallizer is connected to the base.

[0005] The crystallization platform is an irregular inverted triangular structure with rounded corners; the lower end face of the structural component wax model is arranged within the range of the upper end face of the crystallization platform, and the ratio of the area of ​​the upper end face of the crystallization platform to the area of ​​the lower end face of the structural component wax model is 4:1-3:1.

[0006] Below the crystallization stage, there are two conformal anti-crack ribs fixed to the upper surface of the base. Both ends of the conformal anti-crack ribs are connected to the base. The two conformal anti-crack ribs are distributed on both sides of the crystal puller and the crystallization stage. The part of the two conformal anti-crack ribs near the crystal puller and the crystallization stage is bent according to the shape of the crystal puller and the crystallization stage.

[0007] The crystal puller is connected to the accumulator tray via a bottom gating system. The bottom gating system includes an upper straight section and a lower curved section. The upper end of the straight section of the bottom gating system is connected to the lower surface of the accumulator tray, and the lower end of the curved section is connected to the side of the crystal puller, with the connection points arranged perpendicularly to each other. Several individual wax mold systems are evenly arranged around the central column tube. The corner of the lower curved section of the bottom gating system is connected to the upper end of the bottom gating system support rib, and the lower end of the support rib is connected to the base plate.

[0008] The shape of the component wax model is set according to the shape of the casting. The component wax model is equipped with an axial turntable. A small hole is set on the side of the axial turntable facing the central column tube, and a large hole is set on the side of the axial turntable facing away from the central column tube. A vertically centered auxiliary crystal guide riser II is set in the small hole, and the auxiliary crystal guide riser II is connected to the upper and lower inner walls of the small hole. A vertically centered auxiliary crystal guide riser III is set in the large hole, and the auxiliary crystal guide riser III is connected to the upper and lower inner walls of the large hole. An auxiliary crystal guide riser I is set between the axial turntable and the crystallization stage. The auxiliary crystal guide riser I has a cuboid structure. The upper end of the auxiliary crystal guide riser I is connected to the lower surface of the axial turntable, and the lower end of the auxiliary crystal guide riser I is connected to the middle of the top surface of the crystallization stage.

[0009] The upper end face of the wax model of the structural component is connected to a first shrinkage riser, the cross-sectional shape of which matches the upper cross-sectional shape of the wax model. Several anti-expansion protrusions are provided on the surface of the first shrinkage riser facing the central column tube. The end of the anti-expansion protrusion connected to the first shrinkage riser is a cylindrical structure, and the protruding end is a hemispherical structure. The axial turntable is connected to the corresponding first shrinkage riser through a second shrinkage riser with a plate-like structure. The second shrinkage riser is an inverted "L" shape and forms a 90° arc corner at the bend. The lower end of the second shrinkage riser is perpendicularly connected to the upper end of the axial turntable, and the upper end of the second shrinkage riser is perpendicularly connected to the side of the upper end of the first shrinkage riser.

[0010] The feeding riser 1 is connected to the pouring cup 1 through the venting riser. The upper end of the venting riser is connected to the pouring cup, and the lower end is connected to the feeding riser 1 through an S-shaped bend. The S-shaped bends of adjacent venting risers are connected by reinforcing risers. Several reinforcing risers are connected end to end to form a closed loop structure.

[0011] The base has a diameter of 300mm, a central column tube height of 260mm, and an inverted cone top with a large inverted cone diameter of 29mm, a small inverted cone diameter of 25mm, and a height of 10mm. The remaining portion of the central column tube has a diameter of 25mm and a height of 250mm. The material accumulation plate has a diameter of 128mm, a thickness of 8mm, and an inner hole diameter of 49mm. The lower surface of the material accumulation plate is 260mm from the upper surface of the base. The distance between the lower end face contour of the structural wax model and the upper end face contour of the crystallization platform is 1mm-2mm.

[0012] The conformal anti-crack rib has a diameter of 4mm, and a 9mm gap is maintained between the conformal anti-crack rib and the crystal puller and the crystallization stage on both sides.

[0013] The vent riser has a diameter of 10mm, the bottom gating system has a diameter of 6mm, the upper end of the straight section of the bottom gating system is inclined towards the central column tube and the angle between the straight section and the central column tube is 5°, the lower end of the straight section of the bottom gating system is 58mm from the center of the crystal puller, and the support rib has a diameter of 6mm.

[0014] The auxiliary crystal guide riser 2 has a diameter of 3mm; the auxiliary crystal guide riser 3 (11) has a diameter of 4mm; the auxiliary crystal guide riser 1 (13) has a radial length of 16mm along the circumference of the base plate 15, a chordal width of 10mm along the base plate (15), and an axial height of 10mm along the central column tube (8); the reinforcing riser (3) has a diameter of 6mm and a length of 118mm; the shrinkage riser 1 (9) has an axial height of 22mm along the central column tube 8, and several anti-expansion protrusions (4) are evenly arranged at a height of 126mm from the junction of the shrinkage riser 1 (9) and the component wax model 12. The cylinder connecting the anti-expansion protrusion (4) and the shrinkage riser 1 (9) has a height of 0.7mm and a diameter of 3mm, and the diameter of the protruding hemisphere is 3mm; the thickness of the shrinkage riser 2 (7) is 1mm.

[0015] The beneficial effects of this invention are:

[0016] (1) Set mold-type anti-crack ribs on both sides of the lower part of the single wax mold system, set support ribs between the bottom gating channel and the base plate, and set reinforced risers between adjacent vent risers to improve the overall and local structural strength of the gating system, avoid damage to the gating system during shell making, and avoid fire during casting and crystallization.

[0017] (2) Based on the shape and structural characteristics of the fan-shaped single crystal structure casting, the distribution positions of the crystal puller, crystallization stage, feeding riser 1, feeding riser 2, auxiliary crystal puller riser 2, auxiliary crystal puller riser 3, auxiliary crystal puller riser 1, and venting riser are set to ensure smooth flow of high-temperature alloy liquid and sufficient feeding during solidification, avoiding metallurgical defects such as impurities and porosity, while avoiding shell expansion and fire run-out, ensuring the single crystal integrity, metallurgical quality and dimensional stability of the fan-shaped casting;

[0018] (3) The feeding riser is provided with an anti-expansion protrusion on the side facing the central column to improve the local deformation resistance of the shell and prevent the shell from bulging and deforming locally under the action of high temperature alloy liquid;

[0019] (4) For the fan-shaped single crystal structure casting with a length of 108mm, a width of 69mm, and a height of 57mm, the dimensions of each part of the gating system were set, and the product qualification rate was increased from 5% to 50%, which reduced the consumption of master alloy and production resources, improved the stability of casting quality, and increased production efficiency. Attached Figure Description

[0020] Figure 1Schematic diagram of the gating system for a fan-shaped single-crystal structure casting;

[0021] Figure 2 Structural design of the main gating system;

[0022] Figure 3 Front view of a single-piece wax model system;

[0023] Figure 4 Rear view of the single-piece wax model system;

[0024] Figure 5 Schematic diagram of the connection surface between the wax model of the structural component and the crystallization stage;

[0025] Figure 6 Schematic diagram of the combination of the individual wax mold system and the main gating system.

[0026] The attached diagram is labeled as follows: 1. Sprue cup; 2. Accumulator tray; 3. Reinforcing riser; 4. Anti-expansion protrusion; 5. Venting riser; 6. Bottom sprue; 7. Feeding riser II; 8. Central column tube; 9. Feeding riser I; 10. Auxiliary crystal guide riser II; 11. Auxiliary crystal guide riser III; 12. Structural wax model; 13. Auxiliary crystal guide riser I; 14. Crystallization stage; 15. Base plate; 16. Conformal anti-crack rib; 17. Bottom sprue support rib; 18. Crystal guide; 19. Main sprue system; 20. Individual wax model system; 21. Axial turntable; 22. Small hole; 23. Large hole. Detailed Implementation

[0027] The invention will now be fully described using a fan-shaped single-crystal structure casting with a length of 108mm, a width of 69mm, and a height of 57mm as an example.

[0028] See appendix Figure 1 , 6 A fan-shaped single-crystal structure casting system includes a main gating system 19 and five individual wax pattern systems 20. The individual wax pattern systems 20 are connected to the main gating system 19 through vent risers 5 and bottom gating systems 6. The five individual wax pattern systems 20 are evenly arranged around the main gating system 19.

[0029] See appendix Figure 2The main gating system 19 includes a pouring cup 1, a central column tube 8, a sump 2, and a base plate 15. The base plate 15 is a circular disc structure, horizontally positioned at the bottom of the system, with a diameter of 300mm. The lower end of the central column tube 8 is fixedly connected to the center of the base plate 15. The central column tube 8 is arranged perpendicular to the base plate 15 and provides support for the entire gating system. The overall height of the central column tube 8 is 260mm. The central column tube 8 contains an inverted conical apex with a large circle diameter of 29mm, a small circle diameter of 25mm, and a height of 10mm. The remaining part of the column tube 8 has a diameter of 25mm and a height of 250mm; the top of the middle column tube 8 is connected to a material accumulation plate 2 for storing high-temperature alloy liquid and injecting it into the lower gating system. The material accumulation plate 2 is a disc with an inner hole. The material accumulation plate 2 is fixedly connected to the top of the middle column tube 8 through the inner hole. The diameter of the material accumulation plate 2 is 128mm, the thickness is 8mm, and the inner hole diameter is 49mm. The lower surface of the material accumulation plate 2 is 260mm away from the upper surface of the base plate 15. The upper surface of the material accumulation plate 2 is connected to a pouring cup 1, which is used to receive the high-temperature alloy liquid flowing into the gating system.

[0030] See appendix Figure 3 , 4 The individual wax model system 20 includes a crystallizer 18, a crystallization stage 14, a component wax model 12, a first feeding riser 9, and a second feeding riser 7. The upper end of the individual wax model system 20 is connected to the pouring cup 1, and the lower end is connected to the base plate 15. Five individual wax model systems 20 are evenly arranged around the central column tube 8. The shape of the component wax model 12 is set according to the shape of the casting. The component wax model 12 is provided with an axial turntable 21. The side of the axial turntable 21 facing the central column tube 8 has a small hole 22, and the side of the axial turntable 21 facing away from the central column tube 8 has a large hole 23. The small hole 22 of the structural component wax model 12 An auxiliary crystal riser 20, 10, is vertically and centrally arranged. The auxiliary crystal riser 20 is a wax strip with a diameter of 3 mm. The auxiliary crystal riser 20 connects to the upper and lower inner walls of the small hole 22 and is used for single crystal growth. It guides the grain to the upper part of the small hole 22 and also serves as a shrinkage compensation function. An auxiliary crystal riser 31, 11, is vertically and centrally arranged. The auxiliary crystal riser 311 is a wax strip with a diameter of 4 mm. The auxiliary crystal riser 311 connects to the upper and lower inner walls of the large hole 23 and is used for single crystal growth. It guides the grain to the upper part of the large hole 23 and also serves as a shrinkage compensation function.

[0031] See appendix Figure 5The lower end face of the structural wax model 12 is connected to a crystallization platform 14 for single crystal solidification of the casting. The crystallization platform 14 has an irregular inverted triangular structure with rounded corners to reduce the possibility of impurity crystal formation. The lower end face of the structural wax model 12 is located within the upper end face of the crystallization platform 14, and the distance between their edges is 1mm-2mm. This prevents impurities generated in the edge area of ​​the crystallization platform 14 from growing into the casting. At the same time, the local convex and concave structure formed at the connection improves the strength of the shell structure, making it less prone to shell cracks and reducing the risk of shell fire in the transition area between the crystallization platform and the casting. The ratio of the area of ​​the upper end face of the crystallization platform 14 to the area of ​​the lower end face of the structural wax model 12 is 4:1-3:1. If the area ratio is too small, it will increase the possibility of impurity crystal growth into the casting. If the area ratio is too large, it will waste the master alloy.

[0032] See appendix Figure 3 An auxiliary crystal guide riser 13 is provided between the axial turntable 21 and the crystallization stage 14. The auxiliary crystal guide riser 13 has a cuboid structure, with a radial length of 16 mm along the circumference of the base 15, a chordal width of 10 mm along the base 15, and an axial height of 10 mm along the central column tube 8. The upper end of the auxiliary crystal guide riser 13 is connected to the lower surface of the axial turntable 21, and the lower end of the auxiliary crystal guide riser 13 is connected to the middle of the top surface of the crystallization stage 14. It is used for single crystal growth, guiding the grains to the casting body. The lower end of the crystallization stage 14 is connected to the crystal guide 18. The crystal guide 18 adopts an existing technology structure and is used for grain selection. Five crystal guides 18 are evenly arranged around the central column tube 8 on the upper surface of the base 15. The upper end face of the wax model 12 is connected to a shrinkage riser 9. The cross-sectional shape of the shrinkage riser 9 matches the cross-sectional shape of the upper end of the structural wax model 12. The axial height of the shrinkage riser 9 along the central column tube 8 is 22mm. Five anti-expansion protrusions 4 are provided on the surface of the shrinkage riser 9 facing the central column tube 8. One end of the anti-expansion protrusion 4 connected to the shrinkage riser 9 is a cylinder with a height of 0.7mm and a diameter of 3mm, and the other end is a hemisphere with a diameter of 3mm. The five anti-expansion protrusions 4 are evenly arranged at a height of 126mm from the junction of the shrinkage riser 9 and the component wax model 12. The anti-expansion protrusions 4 are used to improve the local deformation resistance of the shell and prevent the shell from bulging and deforming locally under the action of high temperature alloy liquid. The axial turntable 21 is connected to the corresponding feeding riser 9 through a feeding riser 7 with a plate structure of 1mm thickness. The feeding riser 7 has a 90° arc corner and is bent into an inverted "L" shape. The lower end of the feeding riser 7 is vertically connected to the upper end of the axial turntable 21, and the upper end of the feeding riser 7 is vertically connected to the side of the upper end of the feeding riser 9.

[0033] See appendix Figure 1The feeding riser 9 is connected to the pouring cup 1 through the venting riser 5. The venting riser 5 is used to discharge the gas generated or remaining after the high-temperature alloy liquid is injected into the shell. The venting riser 5 is a wax strip with a diameter of 10mm. The upper end of the venting riser 5 is connected to the pouring cup 1, and the lower end is connected to the feeding riser 9 through an S-shaped bend. The S-shaped bends of adjacent venting risers 5 are connected by a reinforcing riser 3 with a diameter of 6mm and a length of 118mm. The five reinforcing risers 3 are connected end to end to form a closed loop structure. The reinforcing risers 3 are used to improve the overall structural strength of the gating system, prevent the gating system from being damaged during the shell making process, and improve the overall strength of the shell.

[0034] See appendix Figure 6 The crystal puller 18 is connected to the accumulation tray 2 via the bottom gating 6. The bottom gating 6 is a wax strip with a diameter of 6 mm. The bottom gating 6 includes an upper straight pipe section and a lower curved pipe section. The upper end of the straight pipe section of the bottom gating 6 is connected to the lower surface of the accumulation tray 2. The upper end of the straight pipe section of the bottom gating 6 is inclined towards the central column tube 8 and the angle between the straight pipe section and the central column tube 8 is 5°. The bottom gating 6 is used as a channel for injecting the high-temperature alloy liquid from the accumulation tray 2 into the crystal puller 18. The lower end of the straight pipe section of the bottom gating 6 is 58 mm away from the center of the crystal puller 18. The lower end of the curved pipe section of the bottom gating 6 is connected to the side of the crystal puller 18 and the connection is perpendicular to each other.

[0035] See appendix Figure 6 The corner of the bend at the lower end of the bottom gating 6 is connected to the upper end of the bottom gating support rib 17. The lower end of the support rib 17 is connected to the base plate 15. The support rib 17 is a wax strip with a diameter of 6mm, which serves to support the bottom gating 6 and prevent fire.

[0036] See appendix Figure 6 Below the crystallization stage 14, there are two conformal anti-crack ribs 16 fixed to the upper surface of the base plate 15. The conformal anti-crack ribs 16 are wax strips with a diameter of 4mm. Both ends of the conformal anti-crack ribs 16 are connected to the base plate 15. The two conformal anti-crack ribs 16 are distributed on both sides of the crystal puller 18 and the crystallization stage 14. The parts of the two conformal anti-crack ribs 16 near the crystal puller 18 and the crystallization stage 14 are bent according to the shape of the crystal puller 18 and the crystallization stage 14 and a 9mm gap is maintained on both sides of the crystal puller 18 and the crystallization stage 14. The conformal anti-crack ribs 16 are used to improve the shell strength of the crystallized part and prevent the shell from escaping.

[0037] The pouring process is as follows:

[0038] Step 1: Press the wax molds according to the above dimensions and shape requirements, including: 1. Sprue cup; 2. Material collection tray; 3. Reinforcing riser; 4. Anti-expansion protrusion; 5. Venting riser; 6. Bottom sprue; 7. Shrinkage riser II; 8. Central column tube; 9. Shrinkage riser I; 10. Auxiliary crystal guide riser II; 11. Auxiliary crystal guide riser III; 12. Structural wax mold; 13. Auxiliary crystal guide riser I; 14. Crystallization stage; 15. Base plate; 16. Conformal anti-crack rib; 17. Bottom sprue support rib; 18. Crystal guide.

[0039] Step 2: Refer to the appendix Figure 3 , 4 The individual wax model system 20 is assembled. From bottom to top, the crystal puller 18 and the crystallization stage 14 are connected. The crystallization stage 14 is connected to the auxiliary crystal puller riser 13 and the structural wax model 12. The structural wax model 12 is connected to the auxiliary crystal puller riser 20 and the auxiliary crystal puller riser 31. The structural wax model 12 is connected to the shrinkage riser 19 and the shrinkage riser 27. Five anti-expansion protrusions 4 are pasted on the smooth side of the shrinkage riser 19.

[0040] Step 3: Refer to the appendix Figure 2 The main gating system 19 is assembled, and the gating cup 1 is connected to the central column tube 8, the central column tube 8 is connected to the material collection tray 2, and the central column tube 8 is connected to the base plate 15 in sequence from top to bottom.

[0041] Step 4: Refer to the appendix Figure 6 The individual wax model system 20 and the main gating system 19 are combined. The bottom gating system 6 is connected to the crystal puller 18 in sequence, the bottom gating system 6 is connected to the bottom gating support rib 17, the bottom gating system 6 is connected to the material accumulation plate 2, the vent riser 5 is connected to the shrinkage riser 9 and the pouring cup 1, and the conformal anti-crack rib 16 is set on both sides of the individual wax model system 20.

[0042] Step 5: Refer to the appendix Figure 1 The overall assembly of the casting system for the single-crystal structure of the fan block is carried out, and all the individual wax mold systems 20 are connected to the main gating system 19 in sequence, and the reinforcing risers 3 are connected between adjacent venting risers 5.

[0043] Step 6: The module is then subjected to shell making, pouring, shell removal, cutting, non-destructive testing, and dimensional inspection to obtain qualified castings.

Claims

1. A casting system for a fan-shaped single-crystal structure casting, comprising a main gating system (19) and several individual wax pattern systems (20), wherein the main gating system (19) comprises a pouring cup (1), a central column tube (8), a material accumulation plate (2), and a base plate (15); the base plate (15) is a circular disk structure, horizontally positioned at the bottom of the main gating system (19); the lower end of the central column tube (8) is fixedly connected to the center of the base plate (15), and the central column tube (8) is arranged perpendicular to the base plate (15); the top end of the central column tube (8) is connected to the material accumulation plate (2), and the upper surface of the material accumulation plate (2) is connected to the pouring cup (1); the individual wax pattern system (20) comprises a crystal puller (18), a crystallization stage (14), and a component wax pattern (12) connected sequentially from bottom to top; the upper end of the individual wax pattern system (20) is connected to the pouring cup (1) through a vent riser (5), and the lower end of the crystal puller (18) is connected to the base plate (15); characterized in that: The crystallization platform (14) is an irregular inverted triangular structure with rounded corners; the lower end face of the structural wax model (12) is arranged within the range of the upper end face of the crystallization platform (14), and the ratio of the area of ​​the upper end face of the crystallization platform (14) to the area of ​​the lower end face of the structural wax model (12) is 4:1-3:1; the shape of the component wax model (12) is set according to the shape of the casting, and the component wax model (12) is provided with an axial turntable (21), the axial turntable (21) facing the central column tube (8) is provided with a small hole (22), and the axial turntable (21) facing away from the central column tube (8) is provided with a large hole (23), and the small hole (22) is provided with a large hole (23). An auxiliary crystal riser 2 (10) is arranged vertically in the center and is connected to the upper and lower inner walls of the small hole (22); an auxiliary crystal riser 3 (11) is arranged vertically in the center of the large hole (23) and is connected to the upper and lower inner walls of the large hole (23); an auxiliary crystal riser 1 (13) is arranged between the axial turntable (21) and the crystallization stage (14). The auxiliary crystal riser 1 (13) is a cuboid structure. The upper end of the auxiliary crystal riser 1 (13) is connected to the lower surface of the axial turntable (21), and the lower end of the auxiliary crystal riser 1 (13) is connected to the middle of the top surface of the crystallization stage (14).

2. The casting system for a sector-type single-crystal structure according to claim 1, characterized in that: Two conformal anti-crack ribs (16) are fixed to the upper surface of the base plate (15) below the crystallization stage (14). Both ends of the conformal anti-crack ribs (16) are connected to the base plate (15). The two conformal anti-crack ribs (16) are distributed on both sides of the crystal puller (18) and the crystallization stage (14). The part of the two conformal anti-crack ribs (16) near the crystal puller (18) and the crystallization stage (14) is bent according to the shape of the crystal puller (18) and the crystallization stage (14).

3. The casting system for a fan-shaped single-crystal structure according to claim 1, characterized in that: The crystal puller (18) is connected to the material accumulation plate (2) through the bottom gating system (6). The bottom gating system (6) includes an upper straight pipe section and a lower curved pipe section. The upper end of the straight pipe section of the bottom gating system (6) is connected to the lower surface of the material accumulation plate (2). The lower end of the curved pipe section of the bottom gating system (6) is connected to the side of the crystal puller (18) and the connection points are arranged perpendicular to each other. Several individual wax mold systems (20) are evenly arranged around the central column tube (8). The corner of the lower curved pipe section of the bottom gating system (6) is connected to the upper end of the bottom gating system support rib (17). The lower end of the support rib (17) is connected to the base plate (15).

4. The casting system for a sector-type single-crystal structure according to claim 1, characterized in that: The upper end face of the structural wax model (12) is connected to a shrinkage riser (9), and the cross-sectional shape of the shrinkage riser (9) matches the cross-sectional shape of the upper end of the structural wax model (12). The surface of the shrinkage riser (9) facing the central column tube (8) is provided with several anti-expansion protrusions (4). The end of the anti-expansion protrusion (4) connected to the shrinkage riser (9) is a cylindrical structure, and the protruding end is a hemispherical structure. The axial turntable (21) is connected to the corresponding shrinkage riser (9) through a plate-shaped shrinkage riser (7). The shrinkage riser (7) is an inverted "L" shaped structure and forms a 90° arc corner at the bend. The lower end of the shrinkage riser (7) is vertically connected to the upper end of the axial turntable (21), and the upper end of the shrinkage riser (7) is vertically connected to the side of the upper end of the shrinkage riser (9).

5. The casting system for a fan-shaped single-crystal structure according to claim 4, characterized in that: The feeding riser 1 (9) is connected to the pouring cup 1 through the venting riser (5). The upper end of the venting riser (5) is connected to the pouring cup (1), and the lower end is connected to the feeding riser 1 (9) through an S-shaped bend. The S-shaped bends of adjacent venting risers (5) are connected by reinforcing risers (3). Several reinforcing risers (3) are connected end to end to form a closed loop structure.

6. The casting system for a sector-type single-crystal structure casting according to claim 1, characterized in that: The base (15) has a diameter of 300mm, the central column (8) has a height of 260mm, the top of the central column (8) is an inverted cone, the large circle of the inverted cone has a diameter of 29mm, the small circle of the inverted cone has a diameter of 25mm, the height of the inverted cone is 10mm, the remaining part of the central column (8) has a diameter of 25mm and a height of 250mm; the material accumulation plate (2) has a diameter of 128mm, a thickness of 8mm, an inner hole diameter of 49mm, and the lower surface of the material accumulation plate (2) is 260mm from the upper surface of the base (15); the distance between the lower end face contour of the structural wax mold (12) and the upper end face contour of the crystallization platform (14) is 1mm-2mm.

7. A casting system for a sector-type single-crystal structure according to claim 2, characterized in that: The conformal anti-crack rib (16) has a diameter of 4 mm, and a 9 mm gap is maintained between the conformal anti-crack rib (16) and both sides of the crystal puller (18) and the crystallization stage (14).

8. The casting system for a fan-shaped single-crystal structure casting according to claim 3, characterized in that: The vent riser (5) has a diameter of 10 mm, the bottom gating channel (6) has a diameter of 6 mm, the upper end of the straight section of the bottom gating channel (6) is inclined towards the central column (8) and the angle between the straight section and the central column (8) is 5°, the lower end of the straight section of the bottom gating channel (6) is 58 mm from the center of the crystal puller (18), and the diameter of the support rib (17) is 6 mm.

9. A casting system for a fan-shaped single-crystal structure according to claim 5, characterized in that: The auxiliary crystal riser 2 (10) has a diameter of 3 mm; the auxiliary crystal riser 3 (11) has a diameter of 4 mm; the auxiliary crystal riser 1 (13) has a radial length of 16 mm along the circumference of the base plate 15, a chordal width of 10 mm along the base plate (15), and an axial height of 10 mm along the central column tube (8); the reinforcing riser (3) has a diameter of 6 mm and a length of 118 mm; the shrinkage riser 1 (9) has an axial height of 22 mm along the central column tube 8, and several anti-expansion protrusions (4) are evenly arranged at a height of 126 mm from the junction of the shrinkage riser 1 (9) and the component wax model 12. The cylinder connecting the anti-expansion protrusion (4) and the shrinkage riser 1 (9) has a height of 0.7 mm and a diameter of 3 mm, and the diameter of the protruding hemisphere is 3 mm; the thickness of the shrinkage riser 2 (7) is 1 mm.

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