A device and method for forming a complex thin-walled casting

Abstract

A complex thin-walled casting forming device and forming method, including heating and heat preservation system, rotating table, a pair of lifting rods, mold shell, sprue cup, speed regulation motor and control console. The rotating table is located in the rotating table mounting hole on the bottom plate of the heat preservation shell. The mold shell is placed on the upper surface of the rotating table. The rotating table and the mold shell are located in the middle of the heating and heat preservation system. The mold shell heat preservation temperature is set in the alloy solid-liquid phase line temperature interval, and the filling capacity of the mother alloy melt is improved under the action of the centrifugal force generated by rotation. The complex thin-walled part with a wall thickness less than 1mm can be completely formed. The invention can also ensure that there is no slag flying out during rotation, ensure the integrity of the complex thin-walled casting, solve the problems of difficult forming of complex thin-walled casting, coarse grains, loose, shrinkage and other organizational defects, improve the casting yield, and obtain the casting with high surface finish. The process is simple, the operability is high, the application range is large, and industrial quantitative production can be realized.

Description

Technical Field

[0001] This invention relates to the field of casting technology, specifically to a device and method for forming complex thin-walled castings. Background Technology

[0002] Complex thin-walled castings, with their excellent comprehensive mechanical properties, corrosion resistance, and low cost, are widely used in aerospace, shipbuilding, chemical, and weaponry fields. With technological advancements, there is a growing pursuit of achieving more rational structures, lightweight construction, high performance, and high utilization rates in complex thin-walled castings. Traditional gravity casting technology often fails to meet technical requirements in producing castings, leading to defects such as incomplete filling, shrinkage porosity, and shrinkage cavities, thus preventing the formation of complete castings. Therefore, selecting a suitable casting process is crucial.

[0003] While traditional casting techniques can produce complex thin-walled castings, they suffer from drawbacks such as complex processes, long workflows, high costs, structural defects, and substandard casting performance. Using novel grain refiners in casting, although improving alloy properties to some extent by refining the grains, alters the original chemical composition of the alloy and introduces inclusions into the microstructure, causing defects. Furthermore, it remains difficult to address issues of complete mold filling and suppression of shrinkage cavities.

[0004] The invention patent CN213968896U discloses a gating system for complex thin-walled castings. It uses a combination of a gating rod and a conical vent shell to form a hidden riser with vent holes, which connects to the gating of the casting mold shell. This achieves sequential solidification, prevents shrinkage porosity during casting, solves the problem of shrinkage porosity in the casting ring, and addresses leakage during machining and pressure testing. However, it does not refine the grain size during solidification. The invention patent CN111360196B discloses a method to improve the fluidity of cast magnesium alloy melt in the mold. This method solves the problem of insufficient fluidity of the alloy in the mold, enhancing its ability to form complex thin-walled castings and reducing defects such as shrinkage porosity. However, it has drawbacks such as increased process steps, the need to add chemical agents, and high cost.

[0005] The invention disclosed in CN114309550A is a device for fine-grain casting based on a local temperature adjustable system. This device completes the solidification of the casting in a heated atmosphere and under external power stirring. With the addition of riser heating components, it can achieve the purpose of fine-grain casting and enhance the feeding function. However, it has problems such as complex device design.

[0006] The invention disclosed in CN109396400A presents an integrated molding method and apparatus for large, complex, thin-walled, fine-grained castings. Based on a multi-zone heating and precise mold temperature control system, a top-to-bottom temperature gradient is generated in the molten mold shell. A suitable pulling speed is then matched to pull the molten material near the liquidus temperature at the bottom of the casting out of the holding zone, achieving sequential solidification of the melt from bottom to top. This eliminates solidification defects such as shrinkage porosity and generates strong electromagnetic disturbances at the solid / liquid interface, hindering crystal growth and strongly refining grains to refine the solidification structure and increase the density of the casting. However, its application is limited and the process is complex, making industrial-scale mass production difficult. Summary of the Invention

[0007] To address the problems of casting difficulties, grain refinement difficulties, and the formation of shrinkage porosity and shrinkage cavities in existing complex thin-walled casting processes, this invention provides a complex thin-walled casting forming device and method.

[0008] This invention proposes a complex thin-walled casting forming device, including a heating and insulation system, a rotary table, and a lifting rod. The rotary table is located below the heating and insulation system and is coaxial with it. One end of the lifting rod is fixedly connected to the heating and insulation system, and the other end is fixed to the mounting platform. By adjusting the height of the lifting rod, the heating and insulation system can be moved up and down, allowing the upper surface of the rotary table to pass through a second through hole in the lower insulation plate of the heating and insulation system to enter or move away from the heating and insulation system.

[0009] The heating and insulation system includes a heater, an upper insulation plate, an insulation sleeve, and a lower insulation plate; wherein the heater and the insulation sleeve are annular, and the upper and lower insulation plates are circular plates; the upper insulation plate has a first through hole at its geometric center; the lower insulation plate has a second through hole at its geometric center. The insulation sleeve is in contact with the upper and lower insulation plates respectively to form an open chamber surrounding the heater, and the axes of the heater, insulation sleeve, upper insulation plate, and lower insulation plate coincide, together forming a uniform temperature zone.

[0010] The rotary table includes a platform and a power unit. The platform is circular and is mounted on the power unit, which provides power to rotate the platform along its axis.

[0011] Preferably, the heater has a height of 50-110 mm, and the distance between its outer surface and the inner wall surface of the insulation shell is 20-50 mm.

[0012] Preferably, the heater is made of graphite or metallic Ta, the upper insulation board and insulation sleeve are made of multi-layer graphite felt, and the lower insulation board is made of porous alumina ceramic material. The thickness of the upper insulation board, insulation sleeve, and lower insulation board can be changed according to actual conditions to obtain the best insulation and heat insulation effect.

[0013] Preferably, the gap between the inner surface of the mounting hole of the rotary table and the circumferential surface of the rotary table plate is 5-15mm, so that the two are in clearance fit.

[0014] Preferably, the speed range of the power unit is 0 to 1000 r / min.

[0015] Preferably, the adjustment stroke of the lifting rod is 1000mm.

[0016] The specific process of forming complex thin-walled castings using the forming device proposed in this invention is as follows:

[0017] Step 1, Tooling preparation:

[0018] The mold shell and pouring cup are made according to the casting structure and casting process requirements. The mold shell is placed on the upper surface of the rotating table; the sprue of the pouring cup is passed through the first through hole in the center of the upper insulation plate, so that the contact surfaces of the pouring cup and the first through hole are in close contact, and at the same time, the bottom of the pouring cup is located at the upper end of the mold shell gate.

[0019] Step 2, adjust the position:

[0020] By adjusting the stroke of the lifting rod, the height of the heating and insulation system is adjusted, thereby changing the relative position between the heating and insulation system and the rotary table, so that the upper surface of the rotary table is flush with the inner upper surface of the lower insulation plate, and the bottom of the pouring cup is placed in the pouring gate of the mold shell.

[0021] Step 3, heating and heat preservation:

[0022] The heating and heat preservation refers to heating the mold shell to a predetermined temperature and then maintaining the temperature to achieve the heating and heat preservation of the mold shell; the heating method can be a single heating method or a segmented heating method.

[0023] When using a single heating method, the heater is heated to the preheating temperature of the mold shell at a heating rate of 5℃ / min to 20℃ / min, and then the temperature is held until the complex thin-walled casting is completed.

[0024] When using segmented heating, the heater is heated to 350-450℃ at a rate of 20℃ / min to 30℃ / min, and held at that temperature for 5 to 10 minutes. After holding, the temperature is increased to the preheating temperature of the mold shell at a rate of 5℃ / min to 20℃ / min, and then held at that temperature until the complex thin-walled casting is completed.

[0025] The preheating temperature of the mold shell is 380℃~610℃.

[0026] Step 4, Rotary Casting:

[0027] The rotary table is turned on, causing the mold shell to rotate. During rotation, the molten casting alloy is poured into the mold shell through the pouring cup to obtain the casting.

[0028] The rotation speed of the mold shell is 300 r / min to 1000 r / min; the pouring speed is 30 mm / s to 80 mm / s.

[0029] Step 5, casting solidification:

[0030] By moving the heating and insulation system and adjusting the rotation speed of the rotary table, enhanced feeding is achieved during the solidification process of the casting.

[0031] By adjusting the stroke of the lifting rod, the height of the heating and insulation system is increased, allowing the system to rise at a speed of 10mm / min to 30mm / min, thereby changing the relative position between the heating and insulation system and the mold shell.

[0032] Meanwhile, by adjusting the rotation speed of the rotary table, centrifugal force is generated during rotation to enhance the feeding of the casting and improve the feeding ability of the alloy.

[0033] The rotating table rotates at a uniformly decelerated speed, comprising two rotational cycles. Specifically:

[0034] The first rotation cycle lasts 2 to 5 minutes, with an initial velocity of 280 to 850 r / min and a final velocity of 200 to 550 r / min. After the first uniformly decelerated rotation cycle ends, the rotary table maintains the final velocity for 10 to 20 seconds. Then, the second rotation cycle begins.

[0035] The second rotation cycle: The duration of the second rotation cycle is 3 min to 7 min, the initial velocity is 200 r / min to 550 r / min, and the final velocity is 100 r / min to 200 r / min.

[0036] After the second rotation cycle ends, the rotary table continues to rotate at its final speed until the heating and insulation system rises to the top of the upper surface of the mold shell, and the bottom surface of the lower insulation plate in the heating and insulation system is higher than the top of the mold shell. Insulation is then stopped, and the rotary table stops rotating.

[0037] Step 6, Sampling:

[0038] After naturally cooling to room temperature, the casting is removed, resulting in a complex thin-walled casting.

[0039] The beneficial effects of this invention are as follows:

[0040] This invention improves the filling capacity of the master alloy melt by setting the mold shell insulation temperature within the solid-liquid phase temperature range and utilizing the centrifugal force generated by rotation, thus enabling the complete molding of complex thin-walled parts with a minimum wall thickness of 0.5mm to 0.9mm. Traditional casting techniques often fail to meet performance requirements in the production of complex thin-walled castings, frequently resulting in defects such as incomplete filling, shrinkage cavities, and porosity. The causes of these defects are listed below:

[0041] 1. Incomplete pouring is one of the common defects in the casting production of complex thin-walled castings. Due to the thin walls, when the molten material enters the mold shell, the large temperature difference between the molten material and the mold shell causes the molten material to be chilled, which affects the flow of the molten material and ultimately results in incomplete forming of the thin-walled casting.

[0042] 2. Shrinkage cavity occurs when the melt is poured into the mold and first comes into contact with the mold wall, causing solidification. Then, as the liquid phase corresponding to the liquid metal solidifies layer by layer along the mold shell from the outside to the center, volume shrinkage occurs and concentrates in the center of the thin-walled casting, resulting in a large shrinkage cavity inside the casting.

[0043] 3. Shrinkage porosity is also a solidification defect caused by alloy shrinkage. The alloy liquid undergoes a liquid-solid phase transformation within a certain temperature range. If the temperature range at which the alloy solidifies is wide, liquid needs to flow in to compensate for the shrinkage when the dendrites solidify. However, some gaps are closed before complete solidification, preventing liquid from flowing in to compensate for the shrinkage, forming small and dispersed pores, which is called shrinkage porosity.

[0044] In this invention, when the rotating table drives the mold shell to rotate, the centrifugal force of the rotating mold shell ensures that the molten alloy fills the mold well, forming a free surface for the thin-walled casting. Simultaneously, by adjusting the rotation speed to change the centrifugal force, significant convection occurs in the molten alloy, causing the dendrites in the first-solidified areas to break up and become free, forming fine and uniform grains. This also accelerates the flow of the residual liquid phase between the solid dendrites, enhancing the feeding function. Furthermore, the lifting rod causes the heating and insulation system to rise upwards inside the mold shell, creating a bottom-up sequential solidification process. Combined with the centrifugal force generated by the rotation, this promotes the feeding effect of the molten alloy on the dendrites, thus preventing the formation of shrinkage cavities and porosity defects in the casting during filling.

[0045] Structural parameters of the aluminum alloy thin-walled casting obtained by this invention

[0046] mm 2.7～3.6 0.5～0.9 1.7～2.2

[0047] In summary, the present invention and method address the three problems of difficult forming of complex thin-walled castings, coarse grains, and structural defects such as shrinkage porosity and shrinkage cavities. This improves the yield of castings, and the process is simple, highly operable, and widely applicable, enabling industrial mass production. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the external shape of the present invention.

[0049] Figure 2 This is a schematic diagram of the heating and insulation system.

[0050] Figure 3 This is a schematic diagram of the rotary table.

[0051] Figure 4 This is a schematic diagram of the lifting boom.

[0052] Figure 5 This is an assembly diagram of the upper insulation board, insulation sleeve, and lower insulation board.

[0053] Figure 6 This is a schematic diagram of the heater.

[0054] Figure 7 This is a schematic diagram of the structure of the present invention.

[0055] In the diagram: 1. Heating and insulation system; 101. Heater; 102. Upper insulation board; 103. Insulation sleeve; 104. Lower insulation board; 105. Temperature measuring instrument; 2. Rotary table; 201. Table; 202. Power unit; 3. Lifting rod; 4. Mold shell; 5. Pour cup; 6. Control console; 7. Wire. Detailed Implementation

[0056] Example 1

[0057] This invention proposes a complex thin-walled casting forming device, including a heating and heat preservation system 1, a rotary table 2, and a lifting rod 3. The temperature measuring instrument 105, mold shell 4, pouring cup 5, control console 6, and wire 7 are only described in detail with reference to the accompanying drawings and specific embodiments. This description is intended to provide a reference and is not part of the core of this invention, but the invention is not limited thereto.

[0058] One end of the lifting rod 2 is fixedly connected to the heating and insulation system 1, and the other end is fixed to the installation platform. The heating and insulation system can be moved up and down by adjusting the height of the lifting rod 3, so that the upper surface of the rotating table 2 passes through the second through hole on the lower insulation plate 104 of the heating and insulation system to enter or move away from the heating and insulation system.

[0059] The heating and insulation system 1 includes a heater 101, an upper insulation plate 102, an insulation sleeve 103, and a lower insulation plate 104. The heater and insulation sleeve are annular, while the upper and lower insulation plates are circular. The upper insulation plate has a first through hole at its geometric center, and the lower insulation plate 104 has a second through hole at its geometric center. The insulation sleeve 103 contacts and combines with the upper insulation plate 102 and the lower insulation plate 104 to form an open chamber surrounding the heater 101. The axes of the heater, insulation sleeve 103, upper insulation plate, and lower insulation plate 104 coincide, forming a uniform temperature zone. The thermometer 105 passes through the outer wall of the insulation sleeve 103 and enters the uniform temperature zone.

[0060] The rotary table 2 includes a table plate 201 and a power unit 202. The table plate 201 is circular and is mounted on the power unit 202. The power provided by the power unit 202 can make the table plate 201 rotate along the axis.

[0061] The heater 101 is made of graphite, with a height and diameter of 110mm. The distance between its outer surface and the inner wall of the insulation shell is 20mm. The thermometer 105 is cylindrical, with a diameter of 40mm and a length of 90mm. The centerline of the thermometer is located at half the height of the heater 101. The upper insulation plate 102 and the insulation sleeve 103 are made of multi-layer graphite felt, and the lower insulation plate 104 is made of porous alumina ceramic material. The upper and lower insulation plates are 20mm thick, and the insulation sleeve 103 is also 20mm thick. The thicknesses of the upper and lower insulation plates, insulation sleeve, and lower insulation plate can be changed according to actual conditions to obtain the best heat insulation effect.

[0062] The gap between the inner surface of the mounting hole of the rotary table 2 and the circumferential surface of the rotary table plate 201 is 5mm, so that the two are fitted with a clearance.

[0063] The power unit 202 is controlled by the control console 6 to drive the rotation of the platform 201 and the up-and-down movement of the lifting rod 3.

[0064] The platform 201 has a diameter of 40mm and a height of 20mm, while the power unit 202 has a height of 50mm and a diameter of 20mm. The speed of the power unit is adjustable from 0 to 1000 r / min, which can meet the requirements for both uniform and non-uniform speed control of the rotary table 2.

[0065] The lifting rod 3 has an adjustment stroke of 1000mm.

[0066] The control console 6 is connected to the lifting boom 3 and the power unit 202 via a wire 7.

[0067] Example 2

[0068] This embodiment describes a method for forming a complex thin-walled casting using the aforementioned forming device. The forming process will be specifically illustrated through nine embodiments. The process parameters for the nine embodiments are shown in Table 2.

[0069] The alloy melt used to form the complex thin-walled casting is made of aluminum alloy, magnesium alloy, or zinc alloy.

[0070] The specific process of this invention is as follows:

[0071] Step 1, Tooling preparation:

[0072] The mold shell 4 and the pouring cup 5 are made according to the casting structure and casting process requirements. The mold shell 4 is placed on the upper surface of the plate 201 of the rotary table 2; the sprue of the pouring cup 5 is passed through the first through hole in the center of the upper insulation plate 102, so that the contact surfaces of the pouring cup 5 and the first through hole are in contact, and at the same time, the lowermost end of the pouring cup 5 is located at the upper end of the pouring gate of the mold shell 4.

[0073] Step 2, adjust the position:

[0074] By adjusting the stroke of the lifting rod 3, the height of the heating and heat preservation system 1 is adjusted, thereby changing the relative position between the heating and heat preservation system 1 and the rotating table 2, so that the upper surface of the table plate 201 of the rotating table 2 is flush with the inner upper surface of the lower heat preservation plate 104, and the bottom of the pouring cup 5 is placed in the pouring gate of the mold shell 4.

[0075] Step 3, heating and heat preservation:

[0076] The heating and heat preservation refers to heating the heating and heat preservation system 1 to a predetermined temperature and then maintaining the temperature to achieve heating and heat preservation of the mold shell 4; the heating method is either a single heating method or a segmented heating method.

[0077] When using a single heating method, the heater 101 is heated to the preheating temperature of the mold shell 4 at a heating rate of 5℃ / min to 20℃ / min, and then the temperature is maintained until the complex thin-walled casting is completed.

[0078] When using segmented heating, heater 101 is heated to 350℃~450℃ at a heating rate of 20℃ / min~30℃ / min, and held at that temperature for 5min~10min. After holding, the temperature is further increased to the preheating temperature of mold shell 4 at a heating rate of 5℃ / min~20℃ / min, and then held at that temperature until the complex thin-walled casting is completed.

[0079] The preheating temperature of the mold shell is 380℃~610℃.

[0080] Step 4, Rotary Casting:

[0081] The power unit 202 is activated, causing the rotary table 2 to rotate the mold shell 4 at a speed of 300 r / min to 1000 r / min. During rotation, the casting alloy molten material is poured into the mold shell 4 through the pouring cup 5 to complete the rotational casting process and obtain the casting. The amount of casting alloy molten material poured is determined according to the size of the mold shell 4; the pouring speed is 30 mm / s to 80 mm / s. In this embodiment, the pouring speed is 30 mm / s to 80 mm / s.

[0082] Step 5, casting solidification:

[0083] By moving the heating and insulation system 1 and adjusting the rotation speed of the rotary table 2, enhanced feeding is achieved during the solidification process of the casting.

[0084] By adjusting the stroke of the lifting rod 3, the height of the heating and heat preservation system 1 is increased, so that the heating and heat preservation system 1 rises at a speed of 10mm / min to 30mm / min, thereby changing the relative position between the heating and heat preservation system 1 and the mold shell 4.

[0085] Meanwhile, the rotation speed of the rotary table 2 is adjusted by the power device 202, and centrifugal force is generated during rotation to enhance the feeding of the casting and improve the feeding ability of the alloy.

[0086] The rotating table 2 rotates at a uniformly decelerated speed, comprising two rotational cycles. Specifically:

[0087] The first rotation cycle lasts from 2 to 5 minutes, with an initial velocity of 280 to 850 r / min and a final velocity of 200 to 550 r / min. After the first uniformly decelerated rotation cycle ends, the rotating platform 2 maintains the final velocity and continues to rotate for 10 to 20 seconds. Then, the second rotation cycle begins.

[0088] The second rotation cycle: The duration of the second rotation cycle is 3 min to 7 min, the initial velocity is 200 r / min to 550 r / min, and the final velocity is 100 r / min to 200 r / min.

[0089] After the second rotation cycle ends, the rotary table 2 continues to rotate at its final speed until the heating and insulation system 1 rises to the top of the upper surface of the mold shell 4, and the bottom surface of the lower insulation plate 104 in the heating and insulation system 1 is higher than the top of the mold shell 4. Insulation is then stopped, and the power unit 202 is turned off, causing the rotary table 2 to stop rotating.

[0090] Step 6, Sampling:

[0091] After natural failure to room temperature, the casting is removed, resulting in a complex thin-walled casting.

[0092] Table 2 Process parameters for each embodiment

[0093]

[0094] To verify the effectiveness of the present invention, the castings obtained in each embodiment were measured, and the results are shown in Table 2:

[0095] Table 2

[0096]

Claims

1. A method for forming complex thin-walled castings using a complex thin-walled casting forming device, characterized in that, The complex thin-walled casting forming device includes a heating and insulation system (1), a rotating table (2), and a lifting rod (3); the rotating table is located below the heating and insulation system and is coaxial with the heating and insulation system; one end of the lifting rod is fixedly connected to the heating and insulation system, and the other end is fixed to the installation platform. The heating and insulation system can be moved up and down by adjusting the height of the lifting rod, so that the upper surface of the rotating table passes through the second through hole in the lower insulation plate of the heating and insulation system to enter or move away from the heating and insulation system. The specific process is as follows: Step 1, Tooling preparation: According to the casting structure and casting process requirements, the mold shell and the pouring cup are made; the mold shell is placed on the upper surface of the rotating table; the sprue of the pouring cup is passed through the first through hole in the center of the upper insulation plate, so that the contact surfaces of the pouring cup and the first through hole are in contact, and at the same time, the bottom of the pouring cup is located at the upper end of the mold shell gate. Step 2, adjust the position: By adjusting the stroke of the lifting rod, the height of the heating and insulation system is adjusted, thereby changing the relative position between the heating and insulation system and the rotating table, so that the upper surface of the rotating table is flush with the inner upper surface of the lower insulation plate, and the bottom of the pouring cup is placed in the pouring gate of the mold shell. Step 3, heating and heat preservation: The heating and heat preservation refers to heating the mold shell to a predetermined temperature and then maintaining that temperature; the heating method can be either a single heating method or a segmented heating method. When using a single heating method, the heater is heated to the preheating temperature of the mold shell at a heating rate of 5℃ / min to 20℃ / min, and then the heat is held until the complex thin-walled casting is completed. When using segmented heating, the heater is heated to 350-450℃ at a heating rate of 20℃ / min~30℃ / min and held for 5min~10min. After the holding period, the temperature is increased to the preheating temperature of the mold shell at a heating rate of 5℃ / min~20℃ / min and then held until the complex thin-walled casting is completed. The preheating temperature of the mold shell is 380℃~610℃; Step 4, Rotary Casting: The rotary table is turned on to rotate the mold shell; during rotation, the casting alloy melt is poured into the mold shell through the pouring cup to obtain the casting. Step 5: Casting the part to reinforce and compensate for shrinkage: By moving the heating and insulation system and adjusting the rotation speed of the rotary table, the solidification process of the casting is enhanced to compensate for shrinkage. By adjusting the stroke of the lifting rod, the height of the heating and insulation system is increased, so that the heating and insulation system rises at a speed of 10 mm / min to 30 mm / min, thereby changing the relative position between the heating and insulation system and the mold shell. Meanwhile, by adjusting the rotation speed of the rotary table, centrifugal force is generated during rotation to enhance the feeding of the casting and improve the feeding ability of the alloy. The rotary table continues to rotate until the heating and insulation system rises to the top of the upper surface of the mold shell, and the bottom surface of the lower insulation plate in the heating and insulation system is higher than the top of the mold shell; then the insulation is stopped, and the rotary table stops rotating. Step 6, Sampling: After naturally cooling to room temperature, the casting is removed, resulting in a complex thin-walled casting.

2. The method for forming complex thin-walled castings as described in claim 1, characterized in that, The heating and insulation system includes a heater, an upper insulation plate, an insulation sleeve, and a lower insulation plate. The heater and insulation sleeve are annular, while the upper and lower insulation plates are circular. The upper insulation plate has a first through hole at its geometric center, and the lower insulation plate has a second through hole at its geometric center. The insulation sleeve contacts and combines with the upper and lower insulation plates to form an open chamber that surrounds the heater. The axes of the heater, insulation sleeve, upper insulation plate, and lower insulation plate coincide, collectively forming a uniform temperature zone.

3. The method for forming complex thin-walled castings as described in claim 1, characterized in that, The rotary table (2) includes a table plate (201) and a power device (202); the table plate (201) is circular and is mounted on the power device, and the power provided by the power device can make the table plate rotate along the axis.

4. The method for forming complex thin-walled castings as described in claim 1, characterized in that, The heater (101) has a height of 50~110mm, and the distance between its outer surface and the inner wall surface of the insulation shell is 20~50mm; the gap between the inner surface of the rotating table mounting hole and the circumferential surface of the rotating table plate is 5~15mm, so that the two are fitted together.

5. The method for forming complex thin-walled castings as described in claim 1, characterized in that, The rotating table rotates at a uniformly decelerated speed, comprising two rotational cycles; specifically: The first rotation cycle lasts from 2 to 5 minutes, with an initial velocity of 280 r / min to 850 r / min and a final velocity of 200 r / min to 550 r / min. After the first uniformly decelerated rotation cycle ends, the rotary table maintains the final velocity and continues to rotate for 10 to 20 seconds, thus entering the second rotation cycle. The second rotation cycle: The duration of the second rotation cycle is 3 min to 7 min, the initial velocity is 200 r / min to 550 r / min, and the final velocity is 100 r / min to 200 r / min.

6. The method for forming complex thin-walled castings as described in claim 1, characterized in that, The rotation speed of the mold shell is 300 r / min to 1000 r / min; the pouring speed is 30 mm / s to 80 mm / s.

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