A casting device and casting method for an aluminum alloy turbine valve body

Abstract

The present invention discloses a casting device and method for an aluminum alloy turbine valve body, belonging to the field of valve body casting. A casting device for an aluminum alloy turbine valve body comprises a barrel body, and further comprises: a casting table, detachably connected to the upper end of the barrel body, wherein the upper end of the casting table is fixedly connected to a top plate via a bracket, a lifting device is fixedly mounted on the top plate, the telescopic end of the lifting device is fixedly connected to a pressure plate, and a feed port and a pressurizing pipe are respectively provided on both sides of the upper end of the barrel body; a lower mold frame is arranged on the casting table, wherein an upper mold frame cooperating therewith is provided on the lower mold frame; a bottom plate is fixedly connected to the inner bottom of the barrel body, wherein a molten iron ladle is detachably connected to the bottom plate, and the inner bottom of the barrel body is provided with a driving part for driving the bottom plate to rotate; the present invention can significantly improve the quality of the cast aluminum alloy turbine valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of valve body casting, and in particular to a casting device and a casting method for an aluminum alloy turbine valve body. Background Art

[0002] Al-Si aluminum alloy is a kind of casting aluminum alloy with high comprehensive mechanical properties and good volume stability. It is currently widely used in aerospace and important civil key parts.

[0003] ZL114A alloy is a typical high-performance Al-Si aluminum alloy. In the T5 heat-treated state, the tensile strength of sand molds and test bars can reach 290 MPa, and the elongation can reach 2%, significantly higher than other Al-Si alloys. Therefore, ZL114A alloy is primarily used in the aerospace industry to manufacture complex castings that withstand medium loads, such as aircraft engine turbine valve bodies, pump bodies, and large aircraft structures.

[0004] As the requirements for aluminum alloy castings shift towards large, complex, thin-walled, turbine and high-strength, higher requirements are placed on the internal metallurgical quality of ZL114A castings, especially turbine valve body castings, requiring no looseness (including dispersed looseness), no pinholes, dense structure, high performance, and no air holes. The current process methods are difficult to meet the technical index requirements of some aerospace castings. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the current process methods are difficult to meet the technical index requirements of some aerospace castings, and to propose a casting device and casting method for an aluminum alloy turbine valve body.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A casting device for an aluminum alloy turbine valve body comprises a barrel body and also includes: a casting table, which is detachably connected to the upper end of the barrel body, wherein the upper end of the casting table is fixedly connected to a top plate through a bracket, a lifting device is fixedly installed on the top plate, and the telescopic end of the lifting device is fixedly connected to a pressure plate, and a feed port and a pressure pipe are respectively provided on both sides of the upper end of the barrel body; a lower mold frame, which is arranged on the casting table, wherein an upper mold frame matching the lower mold frame is provided on the lower mold frame; a bottom plate, which is fixedly connected to the inner bottom of the barrel body, wherein a molten iron ladle is detachably connected to the bottom plate, and the inner bottom of the barrel body is provided with a driving part for driving the bottom plate to rotate, and an anti-gravity tube extending into the molten iron ladle is fixedly connected to the barrel body, and the upper end of the anti-gravity tube extends into the upper mold frame and the lower mold frame.

[0008] In order to rotate the molten iron ladle, preferably, the driving part includes a driving motor fixedly mounted on the lower end of the casting table, and the output shaft of the driving motor is fixedly mounted with a driving gear, wherein the lower end of the base plate is fixedly connected with a rotating shaft extending to the lower end of the barrel body, and the rotating shaft is fixedly connected with a driven gear meshing with the driving gear.

[0009] In order to facilitate the accumulation of impurities in the ladle on the inner wall of the storage tank, preferably, the storage tank of the ladle is in the shape of a pointed cone, and the inner bottom area of ​​the storage tank is smaller than the area of ​​its upper port.

[0010] In order to make the ladle vibrate, further, a plurality of circumferentially distributed protrusions are fixedly connected to the lower end of the bottom plate, and a knocking component for intermittently knocking the protrusions is provided on the inner top of the barrel body.

[0011] In order to intermittently knock the bump, further, the knocking component includes a plurality of longitudinal grooves arranged at the inner bottom of the barrel body, and the plurality of longitudinal grooves are longitudinally slidably connected with a lifting block, wherein the lifting block is elastically connected to the inner bottom of the longitudinal groove through a reset spring.

[0012] In order to facilitate the heat dissipation of the casting, further, the outer walls of the lower mold frame and the upper mold frame are fixedly connected with a heat dissipation cover, and spiral ventilation pipes are fixedly installed in the two heat dissipation covers. The lower end of the barrel body is fixedly installed with a gas storage tank, and the gas storage tank is fixedly connected with an air supply pipe, and the air supply pipe is connected to the spiral ventilation pipe through a hose.

[0013] In order to automatically inflate the gas tank, further, the outer wall of the lifting block is provided with a sealing ring that is in contact with the inner wall of the longitudinal groove, and the lower end of the barrel body is fixedly connected to an intake pipe and an exhaust pipe that are connected to the longitudinal groove, wherein the lower end of the barrel body is fixedly connected to an annular pipe, the exhaust pipe is connected to the annular pipe, and the annular pipe is connected to the input end of the gas tank through a connecting pipe.

[0014] In order to preheat the inert gas entering the barrel body, preferably, the outer wall of the barrel body is fixedly connected to a heat insulation cover, a spiral heat pipe is fixedly installed in the heat insulation cover, and the output end of the spiral heat pipe is fixedly connected to the input end of the pressurized pipe.

[0015] In order to facilitate positioning of the ladle, preferably, a positioning post is fixedly connected to the bottom plate, and a positioning hole cooperating with the positioning post is provided at the lower end of the ladle.

[0016] A method for casting an aluminum alloy turbine valve body, the operating steps are as follows:

[0017] Step 1: Draw the three-dimensional high-pressure turbine valve body casting;

[0018] Step 2: Design the casting gating system and make the mold;

[0019] Step 3: Prepare the sand core. The pipe core of the high-pressure turbine valve body is prepared by mixing ordinary scrubbing sand and chromite sand in a ratio of 1:1. An exhaust rope is added to the pipe sand mold of the high-pressure turbine valve body.

[0020] Step 4: Prepare the outer mold and place chromite sand at the corners of each pressure-bearing pipeline of the high-pressure turbine valve body according to 5 times the thickness of the pipeline;

[0021] Step 5: Assemble the sand core and outer mold in steps 3 and 4 to obtain a sand mold;

[0022] Step 6: Pouring the sand mold in step 5 under counter-gravity low pressure to obtain a casting;

[0023] Step 7: Clean the sand mold in step 6;

[0024] Step 8: heat treating the casting in step 7;

[0025] Step 9: Perform X-ray and fluorescence inspection on the castings in step 8, cut the pipeline to make test rods and inspect them.

[0026] Compared with the prior art, the present invention provides a casting device and method for an aluminum alloy turbine valve body, which has the following beneficial effects:

[0027] 1. The casting device for the aluminum alloy turbine valve body rotates the molten iron ladle by driving the motor. The aluminum alloy molten iron impurities in the molten iron ladle are subjected to centrifugal force. Under the action of centrifugal force, the impurities move toward the inner wall of the molten iron ladle, thereby keeping the impurities away from the anti-gravity tube. As a result, the anti-gravity tube is less likely to absorb impurities in the aluminum alloy molten iron, which can significantly improve the quality of the cast aluminum alloy turbine valve body.

[0028] 2. The aluminum alloy turbine valve body casting device uses a base plate to drive multiple protrusions to sweep in a circular motion, causing the base plate and the molten iron ladle to vibrate. The vibrating ladle automatically discharges bubbles from the aluminum alloy molten iron and allows impurities in the aluminum alloy molten iron to more easily move to the inner wall of the storage tank, making the cast aluminum alloy turbine valve body less prone to bubbles and further improving the final quality of the aluminum alloy turbine valve body casting.

[0029] 3. The casting device for the aluminum alloy turbine valve body opens the valve in the air delivery pipe, allowing the air stored in the air tank to be delivered to the spiral ventilation pipe. As the air passes through the spiral ventilation pipe, it can carry away the heat from the upper and lower mold frames, thereby faster cooling of the castings in the upper and lower mold frames and improving the casting speed.

[0030] 4. This aluminum alloy turbine valve body casting method uses a 1:1 ratio of ordinary scouring sand and chromite sand to prepare the pipe core of the high-pressure turbine valve body. This avoids the problems of weak chilling effect and grain refinement caused by using only ordinary scouring sand. It also reduces the problem of core sinking caused by the high density of chromite sand. Ultimately, it achieves both a chilling effect on the pipe of the high-pressure turbine valve body casting and the dimensional accuracy of the casting.

[0031] 5. This aluminum alloy turbine valve body casting method solves the problem of poor exhaust from the pipeline core by adding an exhaust rope to the pipeline of the high-pressure turbine valve body, reduces the gas content in the casting, and further improves the mechanical properties of the casting pipeline;

[0032] 6. This aluminum alloy turbine valve body casting method uses chromite sand molding on the outside to refine the grain size at that location, improve the density of the structure, and achieve high performance requirements. This effectively solves the problem that the corners of the pressure-bearing pipelines of the high-pressure turbine valve body are relatively thick and large. Conventional sand casting easily produces a non-dense structure, but it can pass X-ray and fluorescence inspections.

[0033] 7. The aluminum alloy turbine valve body casting method can produce high-pressure turbine valve body castings with 7 / 10 / 16mm pipelines that can withstand hydraulic tests of 8MPa / 19MPa / 35MPa. After sectioning the pipeline position of the casting body and testing the room temperature tensile properties, the tensile strength can be controlled within 300MPa~330MPa, and the elongation can reach 2.8~4.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the axonometric structure of a casting device for an aluminum alloy turbine valve body proposed in the present invention from a first perspective;

[0035] Figure 2 This is a schematic diagram of the axonometric structure of a casting device for an aluminum alloy turbine valve body proposed in the present invention from a second perspective;

[0036] Figure 3 This is a schematic diagram of the main cross-sectional structure of a casting device for an aluminum alloy turbine valve body proposed in the present invention;

[0037] Figure 4 The present invention proposes a casting device for an aluminum alloy turbine valve body Figure 3 Schematic diagram of the local structure;

[0038] Figure 5 The present invention proposes a casting device for an aluminum alloy turbine valve body Figure 4 Schematic diagram of the structure of part A;

[0039] Figure 6This is a partial axonometric structural diagram of a casting device for an aluminum alloy turbine valve body proposed in the present invention.

[0040] In the figure: 1. barrel; 2. casting table; 3. top plate; 4. lifting device; 5. pressure plate; 6. upper mold frame; 7. lower mold frame; 8. molten iron ladle; 9. feed port; 10. pressurizing pipe; 11. anti-gravity pipe; 12. bottom plate; 13. driving motor; 14. driving gear; 15. rotating shaft; 16. driven gear; 17. positioning column; 18. positioning hole; 19. longitudinal groove; 20. lifting block; 21. return spring; 22. bump; 23. storage tank; 24. spiral heat pipe; 25. insulation cover; 26. heat dissipation cover; 27. spiral ventilation pipe; 28. gas storage tank; 29. ​​gas pipeline; 30. hose; 31. sealing ring; 32. suction pipe; 33. exhaust pipe; 34. annular pipe; 35. connecting pipe. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention. Example 1:

[0043] Reference Figures 1-6, a casting device for an aluminum alloy turbine valve body, comprising a barrel body 1 for heat-insulating aluminum alloy molten iron, and also comprising: a casting table 2, which is detachably connected to the upper end of the barrel body 1, wherein the upper end of the casting table 2 is fixedly connected to a top plate 3 through a bracket, and a lifting device 4 is fixedly installed on the top plate 3, and the lifting device 4 is an electric telescopic rod, and the telescopic end of the lifting device 4 is fixedly connected to a pressing plate 5, and a feed port 9 for adding molten iron and a pressure pipe 10 for increasing the air pressure in the barrel body 1 are respectively provided on both sides of the upper end of the barrel body 1; a lower mold frame 7 is provided on the casting On the building platform 2, the lower mold frame 7 is provided with an upper mold frame 6 that cooperates with it; the bottom plate 12 is fixedly connected to the inner bottom of the barrel body 1, wherein the bottom plate 12 is detachably connected to the molten iron ladle 8, and the inner bottom of the barrel body 1 is provided with a driving part for driving the bottom plate 12 to rotate, and an anti-gravity pipe 11 extending into the molten iron ladle 8 is fixedly connected to the barrel body 1, and the anti-gravity pipe 11 is used to transport aluminum alloy molten iron into the mold. The anti-gravity pipe 11 is arranged in the middle of the molten iron ladle 8, and the upper end of the anti-gravity pipe 11 extends to the upper mold frame 6 and the lower mold frame 7.

[0044] The sand mold is filled into the upper mold frame 6 and the lower mold frame 7, and the pressure plate 5 is driven by the lifting device 4 to press on the upper mold frame 6. Then, the aluminum alloy molten iron is poured into the storage tank 23 of the iron ladle 8 through the feed port 9. The inert gas is pressurized into the barrel body 1 through the pressure pipe 10. The aluminum alloy molten iron in the storage tank 23 is transported to the mold through the anti-gravity pipe 11 under the action of pressure. When the molten iron in the upper mold frame 6 and the lower mold frame 7 cools down, the casting work of the aluminum alloy turbine valve body is completed. After the casting is completed, the pressure plate 5 can be driven away from the upper mold frame 6 by the lifting device 4. Before pressurizing the barrel body 1, the bottom plate 12 and the molten iron ladle 8 can be driven to rotate by the driving part. The aluminum alloy molten iron impurities in the molten iron ladle 8 will be affected by the centrifugal force. Under the action of centrifugal force, the impurities will approach the inner wall of the molten iron ladle 8, thereby keeping the impurities away from the anti-gravity tube 11. Therefore, the anti-gravity tube 11 is not easy to absorb the impurities in the aluminum alloy molten iron, which can significantly improve the quality of the cast aluminum alloy turbine valve body.

[0045] Furthermore, the outer wall of the barrel body 1 is fixedly connected with a heat-insulating cover 25, and a copper spiral heat-conducting pipe 24 is fixedly installed in the heat-insulating cover 25. The output end of the spiral heat-conducting pipe 24 is fixedly connected to the input end of the pressurized pipe 10;

[0046] When pressurizing the barrel body 1, the pressurized inert gas is transported to the spiral heat pipe 24, and the spiral heat pipe 24 is discharged into the barrel body 1 through the pressurizing pipe 10. When the inert gas passes through the spiral heat pipe 24, the temperature inside the barrel body 1 will heat the spiral heat pipe 24, thereby heating the inert gas inside, preventing the lower temperature inert gas from suddenly entering the barrel body 1, causing the aluminum alloy molten iron to undergo quality changes, and indirectly ensuring the casting quality of the aluminum alloy turbine valve body.

[0047] Furthermore, a positioning column 17 is fixedly connected to the bottom plate 12, and a positioning hole 18 is provided at the lower end of the ladle 8 to cooperate with the positioning column 17. When the ladle 8 is placed on the bottom plate 12, the positioning column 17 is just inserted into the positioning hole 18, thereby facilitating the positioning of the ladle 8. Example 2:

[0048] Reference Figure 3 and Figure 4 , which is basically the same as the first embodiment, furthermore, specifically discloses a specific implementation scheme of the driving part.

[0049] The driving unit includes a driving motor 13 fixedly mounted on the lower end of the casting table 2. The output shaft of the driving motor 13 is fixedly mounted with a driving gear 14. The lower end of the bottom plate 12 is fixedly connected to a rotating shaft 15 extending to the lower end of the barrel 1. The rotating shaft 15 is fixedly connected to a driven gear 16 meshing with the driving gear 14.

[0050] Before applying pressure to the barrel body 1, the drive motor 13 is started, and the drive motor 13 will drive the driving gear 14 to rotate, and the driving gear 14 will drive the rotating shaft 15 to rotate through the driven gear 16, and the rotating shaft 15 will drive the bottom plate 12 and the molten iron ladle 8 to rotate. The aluminum alloy molten iron impurities in the molten iron ladle 8 will be affected by centrifugal force, and the impurities will approach the inner wall of the molten iron ladle 8 under the action of centrifugal force, thereby keeping the impurities away from the anti-gravity tube 11. As a result, the anti-gravity tube 11 is not easily absorbed by the impurities in the aluminum alloy molten iron, and the quality of the cast aluminum alloy turbine valve body can be significantly improved.

[0051] The storage tank 23 of the molten iron ladle 8 is in the shape of a pointed cone, and the inner bottom area of ​​the storage tank 23 is smaller than the area of ​​its upper end, so that impurities in the molten iron can be stably accumulated on the inner wall of the storage tank 23. Example 3:

[0052] Reference Figure 3-Figure 5 , which is basically the same as the second embodiment, and further, a specific implementation scheme for causing the molten iron ladle 8 to vibrate is specifically added.

[0053] The lower end of the bottom plate 12 is fixedly connected to a plurality of circumferentially distributed protrusions 22. The inner top of the barrel body 1 is provided with a striking component for intermittently striking the protrusions 22. The striking component includes a plurality of longitudinal grooves 19 provided on the inner bottom of the barrel body 1. The plurality of longitudinal grooves 19 are longitudinally slidably connected to lifting blocks 20. The lifting blocks 20 are elastically connected to the inner bottom of the longitudinal grooves 19 via return springs 21.

[0054] During the period when the bottom plate 12 drives the molten iron ladle 8 to rotate continuously, the bottom plate 12 will drive multiple protrusions 22 to sweep in a circle, and the multiple protrusions 22 will slide over the multiple lifting blocks 20 in turn, and the multiple lifting blocks 20 will be pressed in turn by the multiple protrusions 22. When pressed, the lifting block 20 will slide into the longitudinal groove 19. When not pressed, the return spring 21 will drive the lifting block 20 to slide upward and reset. When the protrusion 22 collides with the lifting block 20, the knocked protrusion 22 will cause the bottom plate 12 and the molten iron ladle 8 to vibrate. The vibrating molten iron ladle 8 will automatically discharge the bubbles in the aluminum alloy molten iron, and make the impurities in the aluminum alloy molten iron more likely to approach the inner wall of the storage tank 23, making it less likely for bubbles to appear in the cast aluminum alloy turbine valve body casting, further realizing the final quality of the aluminum alloy turbine valve body casting. Example 4:

[0055] Reference Figures 1-6 , which is basically the same as the third embodiment, and further, a specific implementation scheme for dissipating heat for the lower mold frame 7 and the upper mold frame 6 is specifically added.

[0056] The outer walls of the lower mold frame 7 and the upper mold frame 6 are fixedly connected with a heat dissipation cover 26, and the two heat dissipation covers 26 are fixedly installed with a spiral ventilation pipe 27. Among them, the lower end of the barrel body 1 is fixedly installed with a gas storage tank 28, and the gas storage tank 28 is fixedly connected to the gas supply pipe 29. The gas supply pipe 29 is connected to the spiral ventilation pipe 27 through a hose 30;

[0057] When it is necessary to dissipate heat for the castings in the lower mold frame 7 and the upper mold frame 6, the valve in the air supply pipe 29 is opened, and the air stored in the air tank 28 is transported to the spiral ventilation pipe 27, and then finally discharged from the end of the spiral ventilation pipe 27. When the air passes through the spiral ventilation pipe 27, the air can take away the temperature of the upper part of the upper mold frame 6 and the lower mold frame 7, so that the castings in the upper mold frame 6 and the lower mold frame 7 can be cooled faster, thereby improving the molding speed of the castings.

[0058] Furthermore, the outer wall of the lifting block 20 is provided with a sealing ring 31 in contact with the inner wall of the longitudinal groove 19. The lower end of the barrel body 1 is fixedly connected to an intake pipe 32 and an exhaust pipe 33 in communication with the longitudinal groove 19. A one-way valve is fixedly installed in the intake pipe 32 and the exhaust pipe 33. The lower end of the barrel body 1 is fixedly connected to an annular pipe 34, and the exhaust pipe 33 is connected to the annular pipe 34. The annular pipe 34 is connected to the input end of the gas storage tank 28 through a connecting pipe 35.

[0059] When the lifting block 20 slides downward, the lifting block 20 squeezes the air in the longitudinal groove 19 , and the longitudinal groove 19 blows air to the annular tube 34 through the exhaust pipe 33 , and the annular tube 34 inflates the air storage tank 28 through the connecting pipe 35 .

[0060] A method for casting an aluminum alloy turbine valve body, the operating steps are as follows:

[0061] Step 1: Draw the three-dimensional high-pressure turbine valve body casting;

[0062] Step 2: Design the casting gating system and make the mold;

[0063] Step 3: Prepare the sand core. The pipe core of the high-pressure turbine valve body is prepared by mixing ordinary scrubbing sand and chromite sand in a ratio of 1:1. An exhaust rope is added to the pipe sand mold of the high-pressure turbine valve body.

[0064] Step 4: Prepare the outer mold and place chromite sand at the corners of each pressure-bearing pipeline of the high-pressure turbine valve body according to 5 times the thickness of the pipeline;

[0065] Step 5: Assemble the sand core and outer mold in steps 3 and 4 to obtain a sand mold;

[0066] Step 6: Pouring the sand mold in step 5 under counter-gravity low pressure to obtain a casting;

[0067] Step 7: Clean the sand mold in step 6;

[0068] Step 8: heat treating the casting in step 7;

[0069] Step 9: Perform X-ray and fluorescence inspection on the castings in step 8, cut the pipeline to make test rods and inspect them.

[0070] The casting device of the aluminum alloy turbine valve body is as follows: the sand mold is filled into the upper mold frame 6 and the lower mold frame 7, the lifting device 4 drives the pressure plate 5 to press on the upper mold frame 6, and then the aluminum alloy molten iron is poured into the storage tank 23 of the iron ladle 8 through the feed port 9. The inert gas is pressurized into the barrel body 1 through the pressure pipe 10. The aluminum alloy molten iron in the storage tank 23 is transported to the mold through the anti-gravity pipe 11 under the action of pressure. When the molten iron in the upper mold frame 6 and the lower mold frame 7 is cooled, the casting work of the aluminum alloy turbine valve body is completed. After the casting is completed, the lifting device 4 drives the pressure plate 5 away from the upper mold frame 6.

[0071] Before pressurizing the barrel 1, the drive motor 13 is started, and the drive motor 13 drives the driving gear 14 to rotate. The driving gear 14 drives the rotating shaft 15 to rotate through the driven gear 16. The rotating shaft 15 drives the bottom plate 12 and the ladle 8 to rotate. The aluminum alloy molten iron impurities in the ladle 8 will be affected by centrifugal force. Under the action of centrifugal force, the impurities will move toward the inner wall of the ladle 8, thereby keeping the impurities away from the anti-gravity tube 11. As a result, the anti-gravity tube 11 is less likely to absorb impurities in the aluminum alloy molten iron, which can significantly improve the quality of the cast aluminum alloy turbine valve body.

[0072] During the period when the bottom plate 12 drives the molten iron ladle 8 to rotate continuously, the bottom plate 12 will drive multiple protrusions 22 to sweep in a circle, and the multiple protrusions 22 will slide over the multiple lifting blocks 20 in turn, and the multiple lifting blocks 20 will be pressed in turn by the multiple protrusions 22. When pressed, the lifting block 20 will slide into the longitudinal groove 19. When not pressed, the return spring 21 will drive the lifting block 20 to slide upward and reset. When the protrusion 22 collides with the lifting block 20, the knocked protrusion 22 will cause the bottom plate 12 and the molten iron ladle 8 to vibrate. The vibrating molten iron ladle 8 will automatically discharge the bubbles in the aluminum alloy molten iron, and make the impurities in the aluminum alloy molten iron more likely to approach the inner wall of the storage tank 23, making it less likely for bubbles to appear in the cast aluminum alloy turbine valve body casting, further realizing the final quality of the aluminum alloy turbine valve body casting.

[0073] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the scope of protection of the present invention.

Claims

1. A casting device for an aluminum alloy turbine valve body, comprising a barrel (1), characterized in that: Also includes: The casting table (2) is detachably connected to the upper end of the barrel (1). The upper end of the casting table (2) is fixedly connected to a top plate (3) via a bracket, a lifting device (4) is fixedly installed on the top plate (3), and a pressing plate (5) is fixedly connected to the telescopic end of the lifting device (4), and a feed port (9) and a pressure pipe (10) are respectively provided on both sides of the upper end of the barrel body (1); The lower mold frame (7) is arranged on the casting table (2). Wherein, the lower mold frame (7) is provided with an upper mold frame (6) that cooperates with it; The bottom plate (12) is fixedly connected to the inner bottom of the barrel (1). The bottom plate (12) is detachably connected to a molten iron ladle (8), the inner bottom of the barrel body (1) is provided with a driving portion for driving the bottom plate (12) to rotate, and the barrel body (1) is fixedly connected to an anti-gravity tube (11) extending into the molten iron ladle (8), and the upper end of the anti-gravity tube (11) extends into the upper mold frame (6) and the lower mold frame (7); A driving motor (13) is fixedly mounted on the lower end of the casting table (2), and a driving gear (14) is fixedly mounted on the output shaft of the driving motor (13). The lower end of the bottom plate (12) is fixedly connected to a rotating shaft (15) extending to the lower end of the barrel (1), and the rotating shaft (15) is fixedly connected to a driven gear (16) meshing with the driving gear (14); The lower end of the bottom plate (12) is fixedly connected to a plurality of circumferentially distributed protrusions (22), and the inner top of the barrel body (1) is provided with a knocking component for intermittently knocking the protrusions (22); the knocking component comprises: A plurality of longitudinal grooves (19) are provided at the bottom of the barrel body (1), and a lifting block (20) is longitudinally slidably connected in each of the plurality of longitudinal grooves (19). The lifting block (20) is elastically connected to the inner bottom of the longitudinal groove (19) via a return spring (21).

2. The casting device of an aluminum alloy turbine valve body according to claim 1, characterized in that: The storage tank (23) of the molten iron ladle (8) is in the shape of a pointed cone, and the inner bottom area of ​​the storage tank (23) is smaller than the area of ​​its upper port.

3. The casting device of an aluminum alloy turbine valve body according to claim 1, characterized in that: The outer walls of the lower mold frame (7) and the upper mold frame (6) are fixedly connected with a heat dissipation cover (26), and a spiral ventilation pipe (27) is fixedly installed in the two heat dissipation covers (26). A gas storage tank (28) is fixedly mounted on the lower end of the barrel body (1), a gas delivery pipe (29) is fixedly connected to the gas storage tank (28), and the gas delivery pipe (29) is connected to the spiral ventilation pipe (27) through a hose (30).

4. The casting device of an aluminum alloy turbine valve body according to claim 3, characterized in that: The outer wall of the lifting block (20) is provided with a sealing ring (31) that is in contact with the inner wall of the longitudinal groove (19). The lower end of the barrel body (1) is fixedly connected with an air intake pipe (32) and an air discharge pipe (33) that are in communication with the longitudinal groove (19). The lower end of the barrel body (1) is fixedly connected to an annular tube (34), the exhaust pipe (33) is connected to the annular tube (34), and the annular tube (34) is connected to the input end of the gas storage tank (28) through a connecting pipe (35).

5. The casting device for an aluminum alloy turbine valve body according to claim 1, characterized in that: The outer wall of the barrel body (1) is fixedly connected to a heat-insulating cover (25), a spiral heat-conducting pipe (24) is fixedly installed in the heat-insulating cover (25), and the output end of the spiral heat-conducting pipe (24) is fixedly connected to the input end of the pressurized pipe (10).

6. The casting device for an aluminum alloy turbine valve body according to claim 1, characterized in that: A positioning column (17) is fixedly connected to the bottom plate (12), and a positioning hole (18) is provided at the lower end of the ladle (8) to cooperate with the positioning column (17).

7. A method for casting an aluminum alloy turbine valve body, using the casting device for an aluminum alloy turbine valve body according to any one of claims 1 to 6, characterized in that: The steps are as follows: Step 1: Draw the three-dimensional high-pressure turbine valve body casting; Step 2: Design the casting gating system and make the mold; Step 3: Prepare the sand core. The pipe core of the high-pressure turbine valve body is prepared by mixing ordinary scrubbing sand and chromite sand in a ratio of 1:

1. An exhaust rope is added to the pipe sand mold of the high-pressure turbine valve body. Step 4: Prepare the outer mold and place chromite sand at the corners of each pressure-bearing pipeline of the high-pressure turbine valve body according to 5 times the thickness of the pipeline; Step 5: Assemble the sand core and outer mold in steps 3 and 4 to obtain a sand mold; Step 6: Pouring the sand mold in step 5 under counter-gravity low pressure to obtain a casting; Step 7: Clean the sand mold in step 6; Step 8: heat treating the casting in step 7; Step 9: Perform X-ray and fluorescence inspection on the castings in step 8, cut the pipeline to make test rods and inspect them.

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