Bottom pour pressurized turbine wax mold impression mold

Abstract

A bottom-injection turbocharger turbine wax mold molding die includes: a mold base plate with a first cooling medium channel and a second cooling medium channel; an end insert, one axial end of which has an irregular end structure, and the other axial end of which is fixedly connected to the mold base plate; and a gate insert assembly, including a tubular outer sleeve, which is sealed between the inner hole of the end insert and the mold base plate. An inner tubular component is inserted through the outer sleeve, and the outer wall of the inner tube has a groove. The groove and the inner wall of the outer sleeve enclose a third cooling medium channel, which connects the first and second cooling medium channels. The inner hole of the inner tube serves as a wax injection channel. The cooling medium cools the wax in the wax injection channel to form a wax rod, thereby increasing the cooling speed of the gate insert and ensuring good connection between the wax rod and the wax mold, while improving production cycle time and ensuring production continuity.

Description

Technical Field

[0001] This utility model relates to the field of investment casting technology, and in particular to a bottom-fill type turbocharger turbine wax mold pressing die. Background Technology

[0002] Existing turbocharger turbine wax mold molding dies mainly use two wax injection methods: bottom injection and top injection. In the bottom injection molding process, a relatively long section of wax rod often remains on the product wax part. In actual production, the molten wax (wax temperature 60°C) in the molding die is injected into the mold cavity through the sprue insert. As production continues, the temperature of the sprue insert opening will gradually rise due to the heat conduction of the wax. In order to ensure that the forming tie rod in the sprue insert is well connected to the wax mold and removed from the mold together with the wax mold, the sprue insert needs to be given enough cooling time so that the mold base plate with cooling function can transfer the cold energy to the sprue insert, thereby cooling the sprue insert.

[0003] With the accelerated production pace and insufficient cooling time, the temperature at the injection port of the wax mold can reach 45℃-55℃ during prolonged production. When removing the wax mold, the connection between the wax rod and the wax mold is still in a softened state that has not been completely cooled and solidified (medium-temperature wax begins to soften above 35℃ and is in a molten state at 58℃-68℃). The connection between the wax rod and the wax mold is prone to breakage, resulting in the wax rod remaining in the injection port. If the wax rod breaks in the injection port, it must be removed. Otherwise, the wax rod will block the wax injection channel, preventing the next mold from being injected with wax and causing the wax pressing production to be interrupted. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a bottom-injection turbocharger turbine wax mold forming die, thereby improving the cooling rate of the gate insert, ensuring good connection between the wax rod and the wax mold, increasing the production cycle and ensuring production continuity.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A bottom-injection turbocharger turbine wax molding die includes:

[0007] A mold base plate is provided with a first cooling medium channel and a second cooling medium channel. One end of the first cooling medium channel is a first inlet and the other end is a first outlet. One end of the second cooling medium channel is a second inlet and the other end is a second outlet.

[0008] The end insert is a tubular structure. One axial end of the end insert is an irregularly shaped end structure. The outer surface of the irregularly shaped end structure is the center of the bottom of the mold cavity. The other axial end of the end insert is fixedly connected to the mold base plate.

[0009] A gate insert assembly includes a tubular outer sleeve, which is sealed between the inner hole of the end insert and the mold base plate. A tubular inner tube is inserted inside the outer sleeve. The outer wall of the inner tube has a groove. The groove and the inner wall of the outer sleeve form a third cooling medium channel. One end of the third cooling medium channel is a channel inlet and is connected to a first outlet. The other end of the third cooling medium channel is a channel outlet and is connected to a second inlet. The inner hole of the inner tube is a wax injection channel.

[0010] The cooling medium enters the first cooling medium channel from the first inlet, passes through the third cooling medium channel, enters the second cooling medium channel, and exits from the second outlet. The cooling medium cools the wax in the wax injection channel to form a wax rod.

[0011] As a further improvement to the above technical solution:

[0012] The groove includes a first spiral groove and a second spiral groove, which are arranged side by side along the same spiral direction around the outer wall of the inner tube.

[0013] One end of the first spiral groove and one end of the second spiral groove are connected at the same axial position of the inner tube. The other ends of the first spiral groove and the second spiral groove both penetrate the axial end face of the inner tube in another axial direction and form a first notch and a second notch.

[0014] The first notch is located at the end of the first spiral groove, and the second notch is located at the end of the second spiral groove. The first notch and the inner wall of the outer sleeve form the channel inlet, and the second notch and the inner wall of the outer sleeve form the channel outlet.

[0015] The inner wall of the outer casing has a third notch corresponding to the first notch, and the inner wall of the outer casing has a fourth notch corresponding to the second notch. The first notch and the third notch together form the channel inlet, and the second notch and the fourth notch together form the channel outlet.

[0016] The outer sleeve has a limiting groove at its axial end that passes through the end of the outer sleeve and the inner wall. The inner tube has a slot at its axial end side wall and also includes a positioning block that is detachably connected to the slot. The positioning block engages with the limiting groove.

[0017] The mold base plate has a groove on the side facing the irregular end structure, and the bottom of the groove has the first outlet and the second inlet;

[0018] The end of the outer kit is inserted into the countersunk groove and sealed, and the outer wall of the outer kit is sealed to the inner wall of the end insert.

[0019] The bottom of the settling tank is provided with a through hole that penetrates the bottom plate of the mold. The through hole is coaxial with the wax injection channel and is sealed.

[0020] The sidewall of the settling tank has a first plane, and one side of the end of the outer sleeve has a second plane. When the end of the outer sleeve is inserted into the settling tank, the first plane and the second plane are in contact.

[0021] The inner tubular component is a split structure, including:

[0022] The sleeve has the groove on its outer wall. After the sleeve ends corresponding to the channel inlet and the channel outlet come into contact with the bottom surface of the sink, the first outlet is connected to the channel outlet, the second inlet is connected to the channel outlet, and the other end of the sleeve is sealed to the outer sleeve.

[0023] The shaft tube has an inner hole that serves as the wax injection channel. The shaft tube passes through both the inner hole of the sleeve and the through hole. One end of the shaft tube is located outside the irregular end structure, and the other end is located at the bottom of the mold base plate. A first sealing ring is installed in the middle of the shaft tube to seal the shaft tube to the inner wall of the sleeve. The first sealing ring is located between the outlet of the wax injection channel and the inlet of the channel. The shaft tube is sealed to the through hole.

[0024] It also includes a second sealing ring concentric with the through hole, the first outlet and the second inlet are located in the inner ring of the second sealing ring, and the end of the outer fitting is sealed to the bottom of the sink through the second sealing ring.

[0025] Also includes:

[0026] The lower mold assembly, located on the mold base plate, includes multiple movable modules arranged in a ring, with the irregularly shaped end structure located at the center of the ring;

[0027] The upper mold assembly is connected to the lower mold assembly;

[0028] The cavity is formed by the outer wall of the inner tube between the movable modules, the upper mold assembly, the movable modules, and the irregular end structure.

[0029] The beneficial effects of this utility model are as follows:

[0030] This utility model has a compact and reasonable structure and is easy to operate. By adding a cooling medium channel in the gate insert, the cooling medium is introduced to directly cool the gate insert, thereby increasing the cooling speed of the gate insert, ensuring the cooling effect and cooling rate of the wax rod, making the connection between the wax rod and the wax mold good, improving the production cycle and ensuring production continuity.

[0031] This utility model also has the following advantages:

[0032] (1) The groove is designed as two spiral grooves connected end to end, so that the groove extends along the axial direction of the inner tube and forms a spiral-shaped folding cooling medium channel, which increases the flow path of the cooling medium, improves the fluidity of the cooling medium and improves the heat exchange rate.

[0033] (2) The inner tube is designed as a split structure including a sleeve part with a groove and a shaft tube part with a wax injection channel, which facilitates processing and makes it easy to change and adjust the specifications of the inner tube. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model.

[0035] Figure 2 This is a cross-sectional view of the present invention.

[0036] Figure 3 This is an exploded view of the present invention (the inner tube is a split structure).

[0037] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle.

[0038] Figure 5 This is a schematic diagram of the structure of the mold base plate of this utility model.

[0039] Figure 6 This is a schematic diagram of the combined structure of the end insert, outer sleeve and inner tube of this utility model.

[0040] Figure 7 This is a schematic diagram of the structure of the outer casing of this utility model.

[0041] Figure 8 This is a schematic diagram of the structure of the sleeve of this utility model.

[0042] Figure 9 This is a schematic diagram of the sleeve structure of this utility model (from another perspective).

[0043] in:

[0044] 1. Mold base plate; 11. First cooling medium channel; 111. First inlet; 112. First outlet; 12. Second cooling medium channel; 121. Second inlet; 122. Second outlet; 13. Sump; 131. First plane; 132. Through hole; 14. Base plate cooling channel;

[0045] 2. End inserts; 21. Irregularly shaped end structures;

[0046] 3. Inner tube; 31. Shaft tube; 311. Wax injection channel; 312. First sealing ring; 32. Sleeve; 321. Groove; 3211. First spiral groove; 3212. Second spiral groove; 322. Slot; 323. First notch; 324. Second notch; 33. Channel inlet; 34. Channel outlet;

[0047] 4. Outer casing; 41. Second plane; 42. Limiting groove; 43. Third notch; 44. Fourth notch; 45. Second sealing ring;

[0048] 5. Lower mold assembly; 51. Movable module. Detailed Implementation

[0049] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0050] Example 1:

[0051] like Figures 1-2 As shown, the bottom-injection turbocharger turbine wax molding die of this embodiment includes a die base plate 1, an end insert 2, and a gate insert assembly:

[0052] The mold base plate 1 is provided with a first cooling medium channel 11 and a second cooling medium channel 12. One end of the first cooling medium channel 11 is a first inlet 111 and the other end of the first cooling medium channel 11 is a first outlet 112. One end of the second cooling medium channel 12 is a second inlet 121 and the other end of the second cooling medium channel 12 is a second outlet 122.

[0053] The end insert 2 is a tubular structure. One axial end of the end insert 2 is an irregular end structure 21. The outer surface of the irregular end structure 21 is the center of the bottom of the mold cavity. The other axial end of the end insert 2 is fixedly connected to the mold base plate 1.

[0054] The gate insert assembly includes a tubular outer sleeve 4, which is sealed between the inner hole of the end insert 2 and the mold base plate 1. A tubular inner tube 3 is inserted inside the outer sleeve 4. The outer wall of the inner tube 3 is provided with a groove 321. The groove 321 and the inner wall of the outer sleeve 4 enclose a third cooling medium channel. One end of the third cooling medium channel is a channel inlet 33 and is connected to the first outlet 112. The other end of the third cooling medium channel is a channel outlet 34 and is connected to the second inlet 121. The inner hole of the inner tube 3 is a wax injection channel 311, which is used to connect the cavity and the wax injection machine.

[0055] The cooling medium enters the first cooling medium channel 11 from the first inlet 111, passes through the third cooling medium channel, enters the second cooling medium channel 12, and is discharged from the second outlet 122. The cooling medium cools the wax in the wax injection channel 311 to form a wax rod.

[0056] Bottom-injection turbocharger turbine wax molding molds also include:

[0057] The lower mold assembly 5 is located on the mold base plate 1 and includes multiple movable modules 51 arranged in a ring, with the irregular end structure 21 located at the center of the ring.

[0058] The upper mold assembly is connected to the lower mold assembly 5;

[0059] The inner tube 3 is located between the outer wall surface of the movable module 51, the upper mold assembly, the movable module 51, and the irregular end structure 21 to form a cavity.

[0060] Specifically, the cooling medium is cooling water from an ice water machine, and the water temperature is usually 12°C. The mold base plate 1 is also provided with a base plate cooling channel 14 for cooling the mold base plate 1. The driving method and driving structure of the active module 51 are conventional technologies, which will not be described in detail here.

[0061] In this embodiment, the bottom-injection turbocharger turbine wax mold molding die adds a cooling medium channel in the gate insert, allowing the cooling medium to directly cool the gate insert, thereby increasing the cooling speed of the gate insert, ensuring the cooling effect and cooling rate of the wax rod, making the connection between the wax rod and the wax mold good, improving the production cycle and ensuring production continuity.

[0062] The bottom-injection turbocharger turbine wax molding die of this embodiment can achieve rapid cooling of the gate insert, solving the problem of wax rod breaking inside the gate insert after the temperature rises due to continuous wax pressing, thus ensuring continuous production of the mold.

[0063] Example 2:

[0064] like Figures 2-9As shown, the bottom-injection turbocharger turbine wax mold of this embodiment is based on the first embodiment, with a detailed design of the structure of the third cooling medium channel to further improve the cooling effect of the gate insert.

[0065] The groove 321 includes a first spiral groove 3211 and a second spiral groove 3212, which are arranged side by side along the same spiral direction and surround the outer wall surface of the inner tube 3.

[0066] One end of the first spiral groove 3211 and one end of the second spiral groove 3212 are connected at the same axial position of the inner tube 3. The other ends of the first spiral groove 3211 and the second spiral groove 3212 both penetrate the axial end face of the inner tube 3 in another axial direction and form the first notch 323 and the second notch 324.

[0067] The first notch 323 is located at the end of the first spiral groove 3211, and the second notch 324 is located at the end of the second spiral groove 3212. The first notch 323 and the inner wall of the outer sleeve 4 form a channel inlet 33, and the second notch 324 and the inner wall of the outer sleeve 4 form a channel outlet 34.

[0068] The groove 321 is designed as two spiral grooves connected end to end, so that the groove 321 extends along the axial direction of the inner tube 3, forming a spiral-shaped folding cooling medium channel, which increases the flow path of the cooling medium, improves the fluidity of the cooling medium and improves the heat exchange rate.

[0069] In the prior art, the temperature at the gate of the bottom-injection turbocharger turbine wax mold after continuous operation can reach 45℃-55℃. In this embodiment, the temperature at the gate of the bottom-injection turbocharger turbine wax mold after continuous operation is 25℃-30℃, which is about 20℃-25℃ lower.

[0070] In this embodiment, the bottom-injection turbocharger turbine wax mold pressing die can control the temperature difference between the tie rod and the wax mold after cooling to within 5 degrees Celsius by controlling parameters such as the flow rate of the cooling medium.

[0071] After the gate insert cools down rapidly, the wax rod can also cool quickly, increasing the strength at the connection between the wax rod and the wax mold and eliminating wax rod breakage. After 400 consecutive wax pressing cycles, no wax rod breakage occurred, and the wax mold surface quality was excellent, resulting in a 10% improvement in wax pressing efficiency.

[0072] Furthermore, such as Figures 6-9As shown, the inner wall of the outer casing 4 has a third notch 43 corresponding to the first notch 323, and a fourth notch 44 corresponding to the second notch 324. The first notch 323 and the third notch 43 enclose each other to form a channel inlet 33, and the second notch 324 and the fourth notch 44 enclose each other to form a channel outlet 34. Increasing the cross-sectional area of ​​the channel inlet 33 and the channel outlet 34 facilitates flow control.

[0073] Furthermore, in order to facilitate the assembly of the inner tube 3 and the outer kit 4, the axial end of the outer kit 4 is provided with a limiting groove 42 that passes through the end of the outer kit 4 and the inner wall, the axial end side wall of the inner tube 3 is provided with a slot 322, and also includes a positioning block that is detachably connected to the slot 322, the positioning block being engaged with the limiting groove 42.

[0074] Specifically, such as Figures 6-8 As shown, slot 322 and limiting slot 42 are located at one end of channel inlet 33 and channel outlet 34.

[0075] When the axial cross sections of the outer fitting 4 and the inner tube 3 are both circular, the snap-fit ​​structure of the limiting groove 42 and the positioning block facilitates the positioning and installation of the first notch 323 and the third notch 43, as well as the second notch 324 and the fourth notch 44.

[0076] Example 3:

[0077] like Figures 3-7 As shown, the bottom-injection turbocharger turbine wax molding die of this embodiment is based on the above embodiment. The bottom plate 1 of the die is provided with a groove 13 on the side facing the irregular end structure 21. The bottom of the groove 13 is provided with a first outlet 112 and a second inlet 121.

[0078] The end of the outer sleeve 4 is inserted into the recess 13 and sealed at the same time, and the outer wall of the outer sleeve 4 is sealed to the inner wall of the end insert 2.

[0079] The bottom of the settling tank 13 is provided with a through hole 132 that penetrates the mold base plate 1. The through hole 132 is coaxial with the wax injection channel 311 and is sealed.

[0080] When the inner tube 3 is an integrally formed structure, the end of the inner tube 3 can be flush with the bottom of the sink 13, that is, the axial end faces of the first notch 323 and the second notch 324 are in contact with the bottom of the sink 13, so that the first outlet 112 is connected with the channel outlet 34 and the second inlet 121 is connected with the channel outlet 34.

[0081] The end of the preferred inner tube 3 is inserted into the through hole 132 from the side of the sink 13 and sealed, thereby making the inlet of the wax injection channel 311 face the bottom of the mold base plate 1.

[0082] Furthermore, the sidewall of the sink 13 is provided with a first plane 131, and one end of the outer sleeve 4 is provided with a second plane 41. When the end of the outer sleeve 4 is inserted into the sink 13, the first plane 131 and the second plane 41 come into contact. This facilitates the connection between the third cooling medium channel and the first outlet 112 and the second inlet 121.

[0083] Example 4:

[0084] Unlike the above embodiments, the inner tube 3 of the bottom-injection turbocharger turbine wax molding die in this embodiment is a split structure, including a sleeve 32 and a shaft tube 31.

[0085] The outer wall of the sleeve 32 is provided with a groove 321. After the ends of the sleeve 32 corresponding to the channel inlet 33 and the channel outlet 34 come into contact with the bottom surface of the sink 13, the first outlet 112 is connected to the channel outlet 34, the second inlet 121 is connected to the channel outlet 34, and the other end of the sleeve 32 is sealed to the outer sleeve 4.

[0086] The inner hole of the shaft tube 31 is a wax injection channel 311. The shaft tube 31 is inserted into both the inner hole of the sleeve 32 and the through hole 132. One end of the shaft tube 31 is located outside the irregular end structure 21, and the other end is located at the bottom of the mold base plate 1. A first sealing ring 312 is installed in the middle of the shaft tube 31 to seal the shaft tube 31 to the inner wall of the sleeve 32. The first sealing ring 312 is located between the outlet and the inlet 33 of the wax injection channel 311. The shaft tube 31 is sealed to the through hole 132.

[0087] Specifically, such as Figure 2 As shown, the outer wall of the outer sleeve 4 is sealed to the inner wall of the end insert 2, the end of the outer sleeve 4 is sealed to the groove 13, the shaft tube 31 is sealed to the through hole 132, and the shaft tube 31 is sealed to the inner wall of the sleeve 32. This ensures that the cooling medium is not exposed at the docking points of the channel inlet 33, the channel outlet 34, the first outlet 112, and the second inlet 121, thereby ensuring that the cooling medium does not leak.

[0088] Among them, one end of the sleeve 32 is the axial end face of the inner tube 3 that forms the first notch 323 and the second notch 324.

[0089] The inner tube 3 is designed as a split structure comprising a sleeve 32 part with a groove 321 and a shaft tube 31 part with a wax injection channel 311, which facilitates processing and allows for easy replacement and adjustment of the specifications of the inner tube 3.

[0090] Specifically, it also includes a second sealing ring 45 concentric with the through hole 132, the first outlet 112 and the second inlet 121 are located in the inner ring of the second sealing ring 45, and the end of the outer sleeve 4 is sealed to the bottom of the countersink 13 through the second sealing ring 45.

[0091] like Figure 2 , Figure 3 As shown, the outer circumferential surface of the shaft tube 31 is provided with a multi-stage stepped structure with progressively smaller diameters along the wax injection channel 311 from the inlet to the outlet, which facilitates the positioning and installation of the shaft tube 31.

[0092] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A bottom-injection turbocharger turbine wax molding die, characterized in that: include: A mold base plate (1) is provided with a first cooling medium channel (11) and a second cooling medium channel (12). One end of the first cooling medium channel (11) is a first inlet (111), and the other end of the first cooling medium channel (11) is a first outlet (112). One end of the second cooling medium channel (12) is a second inlet (121), and the other end of the second cooling medium channel (12) is a second outlet (122). The end insert (2) is a tubular structure. One axial end of the end insert (2) is an irregular end structure (21). The outer surface of the irregular end structure (21) is the center of the bottom of the cavity of the mold. The other axial end of the end insert (2) is fixedly connected to the mold base plate (1). The gating insert assembly includes a tubular outer sleeve (4), which is sealed between the inner hole of the end insert (2) and the mold base plate (1). A tubular inner tube (3) is inserted inside the outer sleeve (4). The outer wall of the inner tube (3) is provided with a groove (321). The groove (321) and the inner wall of the outer sleeve (4) enclose a third cooling medium channel. One end of the third cooling medium channel is a channel inlet (33) and is connected to the first outlet (112). The other end of the third cooling medium channel is a channel outlet (34) and is connected to the second inlet (121). The inner hole of the inner tube (3) is a wax injection channel (311). The cooling medium enters the first cooling medium channel (11) from the first inlet (111), passes through the third cooling medium channel, enters the second cooling medium channel (12), and is discharged from the second outlet (122). The cooling medium cools the wax in the wax injection channel (311) to form a wax rod.

2. The bottom-injection turbocharger turbine wax molding die as described in claim 1, characterized in that: The groove (321) includes a first spiral groove (3211) and a second spiral groove (3212), the first spiral groove (3211) and the second spiral groove (3212) are arranged side by side along the same spiral direction and surround the outer wall surface of the inner tube (3); One end of the first spiral groove (3211) and one end of the second spiral groove (3212) are connected at the same axial position of the inner tube (3). The other ends of the first spiral groove (3211) and the second spiral groove (3212) both penetrate the axial end face of the inner tube (3) in another axial direction and form a first notch (323) and a second notch (324). The first notch (323) is located at the end of the first spiral groove (3211), and the second notch (324) is located at the end of the second spiral groove (3212). The first notch (323) and the inner wall of the outer sleeve (4) enclose the channel inlet (33), and the second notch (324) and the inner wall of the outer sleeve (4) enclose the channel outlet (34).

3. The bottom-injection turbocharger turbine wax molding die as described in claim 2, characterized in that: The inner wall of the outer fitting (4) is provided with a third notch (43) corresponding to the first notch (323), and the inner wall of the outer fitting (4) is provided with a fourth notch (44) corresponding to the second notch (324). The first notch (323) and the third notch (43) enclose to form the channel inlet (33), and the second notch (324) and the fourth notch (44) enclose to form the channel outlet (34).

4. The bottom-injection turbocharger turbine wax molding die as described in claim 3, characterized in that: The outer sleeve (4) has a limiting groove (42) that passes through the end of the outer sleeve (4) and the inner wall. The inner tube (3) has a slot (322) on the side wall of the axial end. It also includes a positioning block that is detachably connected to the slot (322). The positioning block is engaged with the limiting groove (42).

5. The bottom-injection turbocharger turbine wax molding die as described in claim 1, characterized in that: The mold base plate (1) is provided with a sink groove (13) on the side facing the irregular end structure (21), and the bottom of the sink groove (13) is provided with the first outlet (112) and the second inlet (121); The end of the outer sleeve (4) is inserted into the recess (13) and sealed together, and the outer wall of the outer sleeve (4) is sealed together with the inner wall of the end insert (2). The bottom of the settling tank (13) is provided with a through hole (132) that penetrates the mold base plate (1). The through hole (132) is coaxial with the wax injection channel (311) and is sealed.

6. The bottom-injection turbocharger turbine wax molding die as described in claim 5, characterized in that: The side wall of the sink (13) is provided with a first plane (131), and the end of the outer sleeve (4) is provided with a second plane (41). When the end of the outer sleeve (4) is inserted into the sink (13), the first plane (131) and the second plane (41) are in contact.

7. The bottom-injection turbocharger turbine wax molding die as described in claim 5, characterized in that: The inner tube (3) is a split structure, including: The sleeve (32) has a groove (321) on its outer wall. After the ends of the sleeve (32) corresponding to the channel inlet (33) and the channel outlet (34) come into contact with the bottom surface of the sink (13), the first outlet (112) is connected to the channel outlet (34), the second inlet (121) is connected to the channel outlet (34), and the other end of the sleeve (32) is sealed to the outer sleeve (4). A shaft tube (31) has an inner hole that serves as the wax injection channel (311). The shaft tube (31) passes through both the inner hole of the sleeve (32) and the through hole (132). One end of the shaft tube (31) is located outside the irregular end structure (21), and the other end is located at the bottom of the mold base plate (1). A first sealing ring (312) is installed in the middle of the shaft tube (31) to seal the shaft tube (31) to the inner wall of the sleeve (32). The first sealing ring (312) is located between the outlet of the wax injection channel (311) and the inlet (33) of the channel. The shaft tube (31) is sealed to the through hole (132).

8. The bottom-injection turbocharger turbine wax molding die as described in claim 5, characterized in that: It also includes a second sealing ring (45) concentric with the through hole (132), the first outlet (112) and the second inlet (121) are located in the inner ring of the second sealing ring (45), and the end of the outer sleeve (4) is sealed to the bottom of the sink (13) through the second sealing ring (45).

9. The bottom-injection turbocharger turbine wax molding die as described in claim 1, characterized in that: Also includes: The lower mold assembly (5) is located on the mold base plate (1) and includes multiple movable modules (51) arranged in a ring, with the irregular end structure (21) located at the center of the ring; The upper mold assembly is connected to the lower mold assembly (5); The inner tube (3) is located on the outer wall between the movable modules (51), the upper mold assembly, the movable modules (51), and the irregular end structure (21) together to form the cavity.

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