A gating system and casting method for producing a titanium-aluminum alloy double-ring panel member

Abstract

The application discloses a gating system and a casting method for preparing a titanium-aluminum alloy double-ring support plate component, and relates to the technical field of titanium-aluminum alloy casting. The horizontal gate of the embodiment of the application has a notch, the notch is first pulled off during the cooling process to release stress, and the stress level of the whole component is reduced. The horizontal gate has a thick area, the thick area forms a tensile stress on both sides of the horizontal gate, and the root cracking of the support plate is avoided. A chill directly contacting the casting is arranged at the position where the support plate is connected with the inner ring and the outer ring, the cooling rate of the local thick area at the position where the support plate is connected with the inner ring and the outer ring is accelerated, the solidification sequence from top to bottom at the position where the support plate is connected with the inner ring and the outer ring is ensured, and the shrinkage cavity defect of the local thick area is significantly reduced. Finally, the precise casting forming of the titanium-aluminum alloy double-ring support plate component is realized, the casting cracking of the component is avoided, and the local shrinkage cavity defect is reduced, so that the titanium-aluminum alloy double-ring support plate component meets the use requirements of an advanced aero-engine.

Description

Technical Field

[0001] This application relates to the field of titanium-aluminum alloy casting technology, and in particular to a gating system and casting method for preparing titanium-aluminum alloy double-ring support plate components. Background Technology

[0002] Titanium-aluminum alloy (TiAl alloy) is an intermetallic compound structural material with low density and high specific strength. It also has good creep resistance and oxidation resistance. Double-ring support plate components made of titanium-aluminum alloy, such as exhaust frames and diffusers, can be applied to advanced aero engines, with significant structural weight reduction effect.

[0003] However, double-ring support members made of titanium-aluminum alloy with low plasticity and large solidification shrinkage rate are prone to cracking at the base of the support plate because the joints between the support plate and the inner and outer rings are locally thick areas. During solidification, these joints solidify later than the support plate and the inner and outer rings, resulting in opposite shrinkage tensile stress at the base of the support plate. Furthermore, the presence of thermal bottlenecks at the joints inevitably leads to shrinkage cavities.

[0004] Therefore, how to achieve precision casting of titanium-aluminum alloy thin-walled double-ring support plate components, avoid casting cracks and reduce local shrinkage defects, so that the titanium-aluminum alloy thin-walled double-ring support plate components can meet the requirements of advanced aero-engines, has become an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a gating system and casting method for preparing titanium-aluminum alloy double-ring support plate components; this method enables precision casting of titanium-aluminum alloy thin-walled double-ring support plate components, avoids casting cracks, reduces local shrinkage defects, and ensures that the titanium-aluminum alloy thin-walled double-ring support plate components meet the requirements of advanced aero-engines.

[0006] In a first aspect, embodiments of this application disclose a casting system for preparing a titanium-aluminum alloy double-ring support plate component. The casting system includes a double-ring support plate module, which is used to prepare a double-ring support plate module shell. The double-ring support plate module shell is used to prepare the titanium-aluminum alloy double-ring support plate component after filling with the titanium-aluminum alloy. The double-ring support plate module includes a gating system and a double-ring support plate assembly.

[0007] The gating system includes a vertical gating system and multiple horizontal gating systems; the multiple horizontal gating systems are distributed on the horizontal plane where the end face of one end of the vertical gating system is located, with the vertical gating system as the center; in the direction away from the vertical gating system, the horizontal gating systems are provided with a notch, an inner ring bottom gating, a thick area and an outer ring bottom gating in sequence.

[0008] The double-ring support plate assembly includes an inner ring, an outer ring, multiple support plates, and multiple chills. The chills include an inner ring chill and an outer ring chill. The inner ring chill is located at the intersection of the support plate and the inner ring, and is in contact with the inner wall of the inner ring and the upper edge of the inner ring. The outer ring chill is located at the intersection of the support plate and the outer ring, and is in contact with the outer wall of the outer ring and the upper edge of the outer ring. The chills are located within chill cavities, which are obtained by shelling a pre-made wax block and then dewaxing it.

[0009] The double-ring support plate assembly is perpendicularly connected to the gating assembly; the inner ring bottom gate is located directly below the intersection of the support plate and the inner ring; the outer ring bottom gate is located directly below the intersection of the support plate and the outer ring.

[0010] Optionally, the notch is filled with a ceramic core; the notch is located on the back side of the runner; the cross-sectional area of ​​the notch is 60% to 90% of the cross-sectional area of ​​the runner.

[0011] Optionally, the thick area is arc-shaped, and the cross-sectional area of ​​the thick area is 1.1 to 2 times the cross-sectional area of ​​the horizontal gating.

[0012] Optionally, the inner ring bottom gate is a frustum-shaped cone, narrower at the top and wider at the bottom; the outer ring bottom gate is also a frustum-shaped cone; the upper surface area of ​​the inner ring bottom gate is 2 to 20 times the first area, where the first area is the cross-sectional area where the support plate intersects with the inner ring; the upper surface area of ​​the outer ring bottom gate is 2 to 20 times the second area, where the second area is the cross-sectional area where the support plate intersects with the outer ring.

[0013] Optionally, the lower edge of the chill is located between a first horizontal plane and a second horizontal plane; the first horizontal plane is the horizontal plane where the center point of the support plate is located, and the second horizontal plane is the horizontal plane where the upper edge of the support plate is located.

[0014] The circumferential length of the chill is 1 to 10 times the circumferential length of the support plate; the circumferential length of the chill is the length of the chill along the inner ring direction; the circumferential length of the support plate is the length of the support plate along the inner ring direction.

[0015] The radial thickness of the chill is divided into the radial thickness of the inner ring chill and the radial thickness of the outer ring chill; the radial thickness of the inner ring chill is 1 to 10 times the radial thickness of the inner ring chill; the radial thickness of the outer ring chill is 1 to 10 times the radial thickness of the outer ring chill; the radial thickness of the chill is the length of the chill in the direction of the support plate; the radial thickness of the outer ring chill is the length of the outer ring in the direction of the support plate; the radial thickness of the inner ring chill is the length of the inner ring in the direction of the support plate.

[0016] Optionally, the system further includes a sand box, a preheating furnace, and a casting furnace; the top cover of the sand box is provided with an opening and a fastening device;

[0017] The double-ring support plate module is used to prepare the double-ring support plate module shell;

[0018] The double-ring support plate module shell is used to prepare the titanium-aluminum alloy double-ring support plate component after filling with the titanium-aluminum alloy; the double-ring support plate module shell includes a non-removable chill cavity, which is used to place chills.

[0019] The sand box is used to allow the chill cavity to extend from the opening after the double-ring support plate module shell is placed inside the sand box; and after the chill is placed in the chill cavity, the chill is fixed by the fastening device.

[0020] The preheating furnace is used to preheat the sand box containing the double-ring support plate module shell;

[0021] The casting furnace is used to perform centrifugal casting on the preheated sand box containing the double-ring support plate module shell.

[0022] Secondly, embodiments of this application disclose a casting method for preparing a titanium-aluminum alloy double-ring support plate component. The method is implemented using the gating system described in the first aspect, and includes:

[0023] The double-ring support plate module shell is prepared using the double-ring support plate module, and the double-ring support plate module shell includes a non-removable chilled iron cavity; the chilled iron cavity is obtained by shelling a pre-made wax block and then dewaxing it.

[0024] The double-ring support plate module shell is placed in the sand box, with the chill cavity extending from the opening, serving as the first operation object. The first operation object is preheated and kept warm in the preheating furnace to obtain the second operation object. The chill is placed into the chill cavity of the second operation object and fixed to obtain the third operation object. The size of the chill is the same as the size of the pre-made wax block. The third operation object is placed in the casting furnace, and the master alloy remelting and centrifugal casting operations are performed on the third operation object in the casting furnace to obtain the titanium-aluminum alloy double-ring support plate component.

[0025] Optionally, the manufacturing steps of the chill cavity include: obtaining a pre-made wax block, the size of which is the same as the size of the chill; placing the pre-made wax block at the same position as the chill cavity and welding it onto the double-ring support plate module;

[0026] The bottom and sides of the pre-made wax block are coated to obtain a coated pre-made wax block;

[0027] The pre-coated wax block is dewaxed and baked to obtain the chilled iron cavity.

[0028] Optionally, the preheating temperature of the preheating operation is any temperature between 400°C and 1000°C.

[0029] Optionally, the centrifugal casting speed can be any speed between 100 rpm and 600 rpm. Compared with the prior art, this application has the following advantages:

[0030] This application discloses a titanium-aluminum alloy double-ring support plate component. A notch is provided in the horizontal runner between the vertical runner and the inner ring bottom gate, so that the runner at the notch only serves to fill the mold and is first broken during cooling to release stress, reducing the overall stress level of the component. A thick zone is formed in the horizontal runner between the inner and outer ring bottom gates. During solidification and cooling, this thick zone generates tensile stress on the horizontal runners on both sides, thereby reducing the tensile stress at the root of the support plate and preventing cracking at the root. Chills that directly contact the casting are provided at the junctions of the support plate with the inner and outer rings, accelerating the cooling rate of the locally thick zone at these junctions, enhancing the top-to-bottom solidification sequence at these junctions, and significantly reducing shrinkage cavities in the locally thick zone. Ultimately, the precision casting of the titanium-aluminum alloy thin-walled double-ring support plate component was achieved, avoiding casting cracks and reducing local shrinkage defects, thus enabling the titanium-aluminum alloy thin-walled double-ring support plate component to meet the requirements of advanced aero-engines. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a gating structure for preparing a titanium-aluminum alloy double-ring support plate component, provided in an embodiment of this application.

[0033] Figure 2 This is a schematic diagram of the structure of a module shell for fabricating a titanium-aluminum alloy double-ring support plate component, provided in an embodiment of this application.

[0034] Figure 3 A flowchart of a casting method for preparing a titanium-aluminum alloy double-ring support plate component is provided for embodiments of this application;

[0035] Figure 4A schematic diagram of a titanium-aluminum alloy exhaust frame provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the test results for a titanium-aluminum alloy exhaust frame provided in an embodiment of this application. Detailed Implementation

[0037] As described earlier, double-ring support plate components currently made of titanium-aluminum alloy, which has low plasticity and a large solidification shrinkage rate, exhibit localized thick areas at the junctions between the support plate and the inner and outer rings. During solidification, these junctions solidify later than the support plate and the inner and outer rings themselves, resulting in opposite-direction shrinkage tensile stress at the support plate root, which easily leads to cracking at the support plate root. Furthermore, the presence of thermal bottlenecks at the junctions between the support plate and the inner and outer rings during solidification inevitably produces shrinkage cavities. Therefore, double-ring support plate components made of titanium-aluminum alloy, such as exhaust frames and diffusers, are difficult to meet the practical requirements of advanced aero-engines.

[0038] This application discloses a casting system for preparing a titanium-aluminum alloy double-ring support plate component. A notch is provided in the horizontal runner between the vertical runner and the inner ring bottom gate, so that the runner at the notch only serves to fill the mold and is first broken during cooling to release stress, reducing the overall stress level of the component. A thick zone is set in the horizontal runner between the inner and outer ring bottom gates. During solidification and cooling, the thick zone forms tensile stress on the horizontal runners on both sides, thereby reducing the tensile stress at the root of the support plate and preventing cracking at the root. Chills that are in direct contact with the casting are provided at the junction of the support plate with the inner and outer rings, accelerating the cooling rate of the locally thick zone at the junction of the support plate with the inner and outer rings, enhancing the top-to-bottom solidification sequence at the junction of the support plate with the inner and outer rings, and significantly reducing shrinkage defects in the locally thick zone. The chill cavity is obtained by processing pre-made wax blocks. The chill can be placed in the chill cavity after the shell of the double-ring support plate module is preheated and before furnace pouring, avoiding the high-temperature oxidation failure problem that occurs when the chill is preheated with the sand box, and ensuring that the chill has a good cooling effect. Ultimately, the precision casting of the titanium-aluminum alloy thin-walled double-ring support plate component is achieved, avoiding casting cracks and reducing local shrinkage defects, so that the titanium-aluminum alloy thin-walled double-ring support plate component meets the requirements of advanced aero-engines.

[0039] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0040] Figure 1 This is a schematic diagram of a gating structure for fabricating a titanium-aluminum alloy double-ring support plate component, provided as an embodiment of this application. Figure 1 As shown, the gating structure of the titanium-aluminum alloy double-ring support plate component includes a vertical gating 1 and multiple horizontal gatings 2. The multiple horizontal gatings 2 are distributed on the horizontal plane where the end face of one end of the vertical gating 1 is located, with the vertical gating 1 as the center. In the direction away from the vertical gating 1, the horizontal gatings 2 are sequentially provided with a notch 5, an inner ring bottom gating 3, a thickened area 6, and an outer ring bottom gating 4; and an extension area 7. It should be noted that the horizontal gatings 2 have a non-uniform cross-section.

[0041] Specifically, the extension zone 7 is the area where the horizontal gating 2 extends outward from the outer ring bottom gating 4, and the length of the extension zone is 20-50mm. Among them, the notch 5 is located between the vertical gating 1 and the inner ring bottom gating 3, and the thick zone 6 is located between the inner ring bottom gating 3 and the outer ring bottom gating 4.

[0042] Optionally, the notch 5 can be filled with a ceramic core; when the notch 5 is located on the back flow side of the horizontal runner 2; when the cross-sectional area of ​​the notch 5 is 60%-90% of the cross-sectional area of ​​the horizontal runner 2, the notch only plays the role of filling the mold. During the cooling process of the titanium-aluminum alloy double ring support plate component, it is first broken to release stress and reduce the overall stress level of the titanium-aluminum alloy double ring support plate component.

[0043] Optionally, the thick section 6 is arc-shaped, and its cross-sectional area is 1.1-2 times that of the horizontal runner 2. Therefore, the thick section can accelerate the cooling rate of the local thick section at the junction of the support plate and the inner and outer rings, enhance the top-to-bottom solidification sequence at the junction of the support plate and the inner and outer rings, and significantly reduce shrinkage defects in the local thick section.

[0044] Optionally, both the inner ring bottom gate 3 and the outer ring bottom gate 4 are frustoconical shapes that are narrower at the top and wider at the bottom; the upper surface area of ​​the inner ring bottom gate 3 is 2 to 20 times the first area, which is the cross-sectional area of ​​the intersection 11 of the support plate 8 and the inner ring 9; the upper surface area of ​​the outer ring bottom gate 4 is 2 to 20 times the second area, which is the cross-sectional area of ​​the intersection 12 of the support plate 8 and the outer ring 10.

[0045] Figure 2 This is a schematic diagram of a module shell for fabricating a titanium-aluminum alloy double-ring support plate component, provided as an embodiment of this application. Figure 2 As shown, the modular shell for fabricating the titanium-aluminum alloy double-ring support plate component includes multiple support plate components 8, an inner ring 9, an outer ring 10, an intersection 11 of the support plate 8 and the inner ring 9, an intersection 12 of the support plate 8 and the outer ring 10, an inner ring chill 13, and an outer ring chill 14. The double-ring support plate assembly is perpendicularly connected to the gating assembly; the bottom gate 3 of the inner ring is located directly below the intersection 11 of the support plate 8 and the inner ring 9; the bottom gate 4 of the outer ring is located directly below the intersection 12 of the support plate 8 and the outer ring 10.

[0046] Specifically, the inner ring chill 13 is located at the intersection 11 of the support plate 8 and the inner ring 9; the inner ring chill 13 is connected to the inner wall of the inner ring 9 and to the upper edge of the inner ring 9; the outer ring chill 14 is located at the intersection 12 of the support plate 8 and the outer ring 10, is connected to the outer wall of the outer ring 10 and to the upper edge of the outer ring 10; the chill is located in the chill cavity, which is obtained by processing the pre-made wax block; the process of obtaining the chill cavity by processing the pre-made wax block will be described in detail in the subsequent embodiments of this application.

[0047] Optionally, the lower edge of the chill, including the lower edge of the inner ring chill 13 and the lower edge of the outer ring chill 14, is located between the first horizontal plane and the second horizontal plane; the first horizontal plane is the horizontal plane where the center point of the support plate is located, and the second horizontal plane is the horizontal plane where the upper edge of the support plate is located; the circumferential length of the chill is 1 to 10 times the circumferential length of the support plate.

[0048] The circumferential length of the chill is the length of the chill along the inner ring direction; the circumferential length of the support plate is the length of the support plate along the inner ring direction.

[0049] The radial thickness of the chill is divided into the radial thickness of the inner ring chill and the radial thickness of the outer ring chill; the radial thickness of the inner ring chill is 1 to 10 times the radial thickness of the inner ring chill; the radial thickness of the outer ring chill is 1 to 10 times the radial thickness of the outer ring chill.

[0050] The radial thickness of the chill is the length of the chill in the direction of the support plate; the radial thickness of the outer ring is the length of the outer ring in the direction of the support plate; the radial thickness of the inner ring is the length of the inner ring in the direction of the support plate.

[0051] Specifically, the vertical length of the chill is called the height of the chill; the length of the sidewall where the chill connects to the inner ring 9 is called the circumferential length of the chill; and the length of the chill in the direction of the support plate 8 is called the radial length of the chill. In the height of the chill, the lower edge of the chill lies between the horizontal plane where the center point of the support plate 8 is located and the horizontal plane where the upper edge of the support plate 8 is located; the upper edge of the chill is not lower than the upper edge of the inner ring 9 or the outer ring 10; the circumferential length of the chill is 1 to 10 times the circumferential length of the support plate 8; and the radial length of the chill is 1 to 10 times the radial thickness of the inner ring 9 or the outer ring 10.

[0052] It should be noted that the chills are placed inside chill cavities. These cavities are obtained by shelling pre-made wax blocks and then dewaxing them. The chills can be placed inside the chill cavities after the double-ring support plate module shell is preheated and before furnace pouring, avoiding the high-temperature oxidation failure problem that occurs when the chills are preheated together with the sand box, thus ensuring good cooling performance. The process of placing the chills into the chill cavities will be described in detail in subsequent embodiments of this application.

[0053] In summary, in this embodiment, a notch is provided in the horizontal runner between the vertical runner and the inner ring bottom gate, so that the runner at the notch only serves the purpose of filling the mold. During the cooling process, it is first broken to release stress, thus reducing the overall stress level of the component. A thick area is set in the horizontal runner between the inner ring bottom gate and the outer ring bottom gate. During solidification and cooling, the thick area forms tensile stress on the horizontal runners on both sides, thereby reducing the tensile stress at the root of the support plate and avoiding cracking at the root of the support plate. A chill is provided at the junction of the support plate with the inner and outer rings, which is in direct contact with the casting. This accelerates the cooling rate of the local thick area at the junction of the support plate with the inner and outer rings, enhances the top-to-bottom solidification sequence at the junction of the support plate with the inner and outer rings, and significantly reduces shrinkage defects in the local thick area. The chill cavity is obtained by processing a pre-made wax block. Ultimately, the precision casting of the titanium-aluminum alloy thin-walled double-ring support plate component was achieved, avoiding casting cracks and reducing local shrinkage defects, thus enabling the titanium-aluminum alloy thin-walled double-ring support plate component to meet the requirements of advanced aero-engines.

[0054] This application also provides a casting system and tooling for preparing titanium-aluminum alloy double-ring support plate components, including a double-ring support plate module, a double-ring support plate module shell, a sand box, a preheating furnace, and a casting furnace; the double-ring support plate module shell includes a non-removable chill cavity for placing chills; the upper cover of the sand box is provided with an opening and a fastening device.

[0055] The double-ring support plate module is used to prepare the double-ring support plate module shell;

[0056] The double-ring support plate module shell is used to prepare the titanium-aluminum alloy double-ring support plate component after filling with the titanium-aluminum alloy.

[0057] The sand box is used to allow the chill cavity to extend from the opening after the double-ring support plate module shell is placed inside the sand box; and after the chill is placed in the chill cavity, the chill is fixed by the fastening device.

[0058] The preheating furnace is used to preheat the sand box containing the double-ring support plate module shell;

[0059] The casting furnace is used to perform centrifugal casting on the preheated sand box containing the double-ring support plate module shell.

[0060] This application also provides a casting method for a titanium-aluminum alloy double-ring support plate component, which is implemented using the gating system described in this application.

[0061] Figure 3 This is a flowchart illustrating a casting method for preparing a titanium-aluminum alloy double-ring support plate component, provided as an embodiment of this application. Figure 3 As shown, the casting method includes:

[0062] S301: Prepare the shell of the double-ring support plate module.

[0063] As mentioned above, the function of the double-ring support plate module shell is to prepare the titanium-aluminum alloy double-ring support plate component after filling with the titanium-aluminum alloy. Since the technology for preparing the double-ring support plate module shell using double-ring module support plates is relatively mature, the specific technology for preparing the double-ring support plate module shell will not be described in detail in this embodiment.

[0064] It should be noted that the double-ring support plate module shell includes a non-removable chilled iron cavity.

[0065] Optionally, the step of obtaining the chill cavity by processing the pre-made wax block is as follows: First, obtain a pre-made wax block with the same dimensions as the chill in question; place the pre-made wax block at the same location as the chill cavity and weld it to the double-ring support plate module. Then, coat the bottom and sides of the pre-made wax block to obtain a coated pre-made wax block, i.e., do not coat the top of the pre-made wax block, the purpose of which is to leave an opening for the subsequent insertion of the chill. Finally, perform a dewaxing and baking operation on the coated pre-made wax block to obtain the chill cavity. Since the coating and dewaxing and baking techniques are relatively mature, this application will not describe the above process in more detail.

[0066] S302: Place the double-ring support plate module shell into the sand box, so that the chilled iron cavity extends out from the opening, as the first operation object.

[0067] Specifically, the sand box's top cover has an opening and a fastening device. The first operation involves the chill cavity, integrally formed with the double-ring support plate module shell and inseparable from it, extending from the opening on the top cover after the double-ring support plate module shell is placed into the sand box. It should be noted that the chill cavity in the double-ring support plate module shell protrudes 5mm to 50mm above the top cover of the sand box; this facilitates subsequent fixation of the chill after it is placed into the chill cavity.

[0068] S303: Perform preheating and heat preservation operations on the first object of operation through the preheating furnace to obtain the second object of operation.

[0069] After obtaining the first object to be operated on, it is placed in a preheating furnace to perform preheating and heat preservation operations, thereby obtaining the second object to be operated on. The preheating temperature is between 400℃ and 1000℃, and the heat preservation time is between 2 hours and 8 hours.

[0070] S304: Place the chill into the chill cavity of the second operating object, fix the chill, and obtain the third operating object;

[0071] After obtaining the second object of operation, the chill is placed into the chill cavity and fixed using the fixing device on the top cover of the sand box; then the third object of operation is obtained.

[0072] It should be noted that the advantage of placing the chill into the chill cavity after the double-ring support plate module shell has been preheated and insulated and before casting is that it avoids the problem of high-temperature oxidation failure caused by the chill being preheated together with the sand box, and also ensures that the chill has a good cooling effect.

[0073] S305: The third operation object is placed in the casting furnace, and the master alloy remelting and centrifugal casting operations are performed on the third operation object through the casting furnace to obtain the titanium-aluminum alloy double ring support plate component.

[0074] Finally, the third workpiece is placed in a casting furnace, where the master alloy is remelted and centrifugally cast to obtain the titanium-aluminum alloy double-ring support plate component. The centrifugal casting speed is between 100 rpm and 600 rpm.

[0075] This application also provides an exhaust frame with a titanium-aluminum alloy double-ring support plate structure prepared using the above-described method and system. Figure 4 This is a schematic diagram of a titanium-aluminum alloy exhaust frame provided in an embodiment of this application. Figure 4 As shown, the radial thickness of the inner ring of the exhaust frame is 3mm, meaning the thickness of the inner ring in the direction of the support plate is 3mm; the radial thickness of the outer ring of the exhaust frame is 4mm, meaning the thickness of the outer ring in the direction of the support plate is 4mm; the circumferential length of the exhaust frame support plate is 5mm, meaning the length of the sidewall where the support plate meets the inner ring is 5mm; the cross-sectional area at the junction of the support plate and the inner ring is 15mm². 2 The cross-sectional area at the junction of the support plate and the outer ring is 20mm². 2 .

[0076] It should be noted that the preparation Figure 4The specific parameters of the titanium-aluminum alloy exhaust frame are as follows: the notch is filled with a ceramic core, located on the back flow side, and its cross-sectional area accounts for 80% of the cross-sectional area of ​​the horizontal runner. The thick section is arc-shaped, and its cross-sectional area is 1.8 times that of the horizontal runner. The horizontal runner extends outward by 30mm at the bottom gate of the outer ring. The upper surface area of ​​the bottom gate of the inner ring is 200mm². 2 The upper surface area of ​​the outer ring bottom gate is 300mm². 2 The lower edge of the chill is located at the middle of the support plate. The radial thickness of the inner ring chill is 20mm, and the circumferential length of the outer ring chill is 30mm. The radial thickness of the outer ring chill is 30mm, and the circumferential length of the outer ring chill is 40mm. The exhaust frame module shell is placed in the sand box, and the shell sidewall of the chill cavity extends from the opening of the sand box cover, 10mm higher than the sand box cover.

[0077] It should be noted that the preparation Figure 4 The detailed steps for the titanium-aluminum alloy exhaust frame are as follows: The exhaust frame module shell is placed in a sand box, with the shell sidewall of the chill cavity extending from the opening in the sand box cover. The sand box containing the exhaust frame module shell is placed in a preheating furnace. After preheating to 800℃ and holding at that temperature for 4 hours, the sand box is removed from the preheating furnace. A chill of the same size as the pre-made wax block is placed in the chill cavity and secured using the fastening device on the sand box cover. The sand box is placed in a casting furnace, and a vacuum is immediately activated for remelting of the master alloy under vacuum. The titanium-aluminum alloy exhaust frame is then cast at a centrifugal casting speed of 300 rpm.

[0078] Figure 5 This is a schematic diagram illustrating the test results of a titanium-aluminum alloy exhaust frame provided in an embodiment of this application. Figure 5 As shown, X-ray inspection revealed no cracks at the root of the exhaust frame support plate, and no shrinkage defects were found in the local thick areas where the exhaust frame support plate connects with the inner and outer rings of the exhaust frame.

[0079] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The system embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Those skilled in the art can understand and implement this without creative effort.

[0080] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A casting system for preparing titanium-aluminum alloy double-ring support plate components, characterized in that, The gating system includes a double-ring support plate module; the double-ring support plate module is used to prepare a double-ring support plate module shell; the double-ring support plate module shell is used to prepare the titanium-aluminum alloy double-ring support plate component after filling with the titanium-aluminum alloy; the double-ring support plate module includes a gating system and a double-ring support plate component; The gating system assembly includes a vertical gating system and multiple horizontal gating systems. The multiple horizontal gating systems are distributed around the vertical gating system on a horizontal plane containing the end face of one end of the vertical gating system. In a direction away from the vertical gating system, each horizontal gating system sequentially has a notch, an inner ring bottom gating, a thickened area, and an outer ring bottom gating. The notch is filled with a ceramic core. The notch is located on the backflow side of the horizontal gating system. The cross-sectional area of ​​the notch is 60% to 90% of the cross-sectional area of ​​the horizontal gating system. The double-ring support plate assembly includes an inner ring, an outer ring, multiple support plates, and multiple chills. The chills include an inner ring chill and an outer ring chill. The inner ring chill is located at the intersection of the support plate and the inner ring, and is in contact with the inner wall of the inner ring and the upper edge of the inner ring. The outer ring chill is located at the intersection of the support plate and the outer ring, and is in contact with the outer wall of the outer ring and the upper edge of the outer ring. The chills are located within chill cavities, which are obtained by shelling a pre-made wax block and then dewaxing it. The double-ring support plate assembly is perpendicularly connected to the gating assembly; the inner ring bottom gate is located directly below the intersection of the support plate and the inner ring; the outer ring bottom gate is located directly below the intersection of the support plate and the outer ring.

2. The casting system according to claim 1, characterized in that, The thick section is arc-shaped, and its cross-sectional area is 1.1 to 2 times the cross-sectional area of ​​the horizontal gating.

3. The casting system according to claim 1, characterized in that, The inner ring bottom gate is a frustum-shaped cone, narrower at the top and wider at the bottom; the outer ring bottom gate is also a frustum-shaped cone. The area of ​​the upper end face of the bottom gate of the inner ring is 2 to 20 times the first area, where the first area is the cross-sectional area at the intersection of the support plate and the inner ring. The upper surface area of ​​the bottom gate of the outer ring is 2 to 20 times the second area, which is the cross-sectional area at the intersection of the support plate and the outer ring.

4. The casting system according to claim 1, characterized in that, The lower edge of the chill is located between the first horizontal plane and the second horizontal plane; the first horizontal plane is the horizontal plane where the center point of the support plate is located, and the second horizontal plane is the horizontal plane where the upper edge of the support plate is located. The circumferential length of the chill is 1 to 10 times the circumferential length of the support plate; the circumferential length of the chill is the length of the chill along the inner ring direction; the circumferential length of the support plate is the length of the support plate along the inner ring direction. The radial thickness of the chill is divided into the radial thickness of the inner ring chill and the radial thickness of the outer ring chill; the radial thickness of the inner ring chill is 1 to 10 times the radial thickness of the inner ring chill; the radial thickness of the outer ring chill is 1 to 10 times the radial thickness of the outer ring chill; the radial thickness of the chill is the length of the chill in the direction of the support plate; the radial thickness of the outer ring chill is the length of the outer ring in the direction of the support plate; the radial thickness of the inner ring chill is the length of the inner ring in the direction of the support plate.

5. The gating system according to any one of claims 1-4, characterized in that, The system also includes a sand box, a preheating furnace, and a casting furnace; the top cover of the sand box is provided with an opening and a fastening device; The double-ring support plate module is used to prepare the double-ring support plate module shell; The double-ring support plate module shell is used to prepare the titanium-aluminum alloy double-ring support plate component after filling with the titanium-aluminum alloy; the double-ring support plate module shell includes a non-removable chill cavity, which is used to place chills. The sand box is used to allow the chill cavity to extend from the opening after the double-ring support plate module shell is placed inside the sand box; and after the chill is placed in the chill cavity, the chill is fixed by the fastening device. The preheating furnace is used to preheat the sand box containing the double-ring support plate module shell; The casting furnace is used to perform centrifugal casting on the preheated sand box containing the double-ring support plate module shell.

6. A casting method for preparing a titanium-aluminum alloy double-ring support plate component, characterized in that, The method is implemented using the casting system of claim 5, and the method includes: The double-ring support plate module shell is prepared using the double-ring support plate module, and the double-ring support plate module shell includes a non-removable chilled iron cavity; the chilled iron cavity is obtained by shelling a pre-made wax block and then dewaxing it. The double-ring support plate module shell is placed in the sand box, so that the chilled iron cavity extends out from the opening, serving as the first operation object; The first object to be operated on is preheated and kept warm in the preheating furnace to obtain the second object to be operated on. The chill is placed into the chill cavity of the second operating object, and after the chill is fixed, a third operating object is obtained; the size of the chill is the same as the size of the pre-made wax block. The third workpiece is placed in the casting furnace, and the casting furnace is used to perform master alloy remelting and centrifugal casting operations on the third workpiece to obtain the titanium-aluminum alloy double-ring support plate component.

7. The method according to claim 6, characterized in that, The fabrication steps of the chill cavity include: Obtain a pre-made wax block, the size of which is the same as that of the chill; the pre-made wax block is placed in the same position as the cavity of the chill, and is welded onto the double-ring support plate module; The bottom and sides of the pre-made wax block are coated to obtain a coated pre-made wax block; The pre-coated wax block is dewaxed and baked to obtain the chilled iron cavity.

8. The method according to claim 6, characterized in that, The preheating temperature for the preheating operation is any temperature between 400℃ and 1000℃.

9. The method according to claim 6, characterized in that, The centrifugal casting speed is any speed between 100 rpm and 600 rpm.

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