CN214920332U - Negative pressure centrifugal casting device - Google Patents

Abstract

The utility model provides a negative pressure centrifugal casting device, including the mould module, the mould module can wind the axis of rotation of self, and the mould module is used for forming the casting die cavity with the combination of casting raw materials, and casting hole and exhaust hole have been seted up to the mould module, and casting hole is used for pouring into molten liquid to the casting die cavity, and exhaust hole intercommunication casting die cavity and external environment, the axis in exhaust hole have the contained angle with the axis of rotation, and the exhaust hole is close to the one end and the casting die cavity intercommunication of axis of rotation, and the one end and the external environment intercommunication of axis of rotation are kept away from in the exhaust hole. Through setting up the mould module, the mould module rotates at a high speed, and the rotation of mould module produces centrifugal force, and centrifugal force makes the partial gas in the casting die cavity discharge from the exhaust hole to make the atmospheric pressure in the casting die cavity be less than atmospheric pressure, build the negative pressure environment in the casting die cavity, realize negative pressure centrifugal casting, the gas pocket bubble defect that forms when negative pressure centrifugal casting device can reduce the casting.

Description

Negative pressure centrifugal casting device

Technical Field

The utility model relates to a centrifugal casting research field, especially a negative pressure centrifugal casting device.

Background

In the traditional process, a die-casting method is adopted for producing the motor rotor, but the die-cast motor rotor has the defects of low density, air holes and air bubbles, poor concentricity and the like, so that the parameter requirements of a motor product with higher performance cannot be met, and various faults can occur during use.

The prior art is a process for producing a motor rotor by using a centrifugal casting method, such as the centrifugal casting method of the motor rotor disclosed in the invention with the application number of 20510299648.8 and the rotor forming method disclosed in the invention with the application number of 201520519743.4. The centrifugal casting method improves the problems of poor concentricity, low density, air holes and bubbles and the like existing in the die casting method, but still has a space for further improvement.

At present, in order to further improve the production quality of the motor rotor and reduce the defects of air holes, air bubbles and the like, a process for producing the motor rotor by using a vacuum centrifugal casting method is also provided, and the vacuum environment can promote the air bubbles in the liquid to be discharged. This undoubtedly reduces the production speed of the motor rotor, slows down the production takt time, and is not beneficial to the production and processing of the motor rotor in large batch.

Disclosure of Invention

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a negative pressure centrifugal casting device, negative pressure centrifugal casting device can reduce the gas pocket bubble defect in the casting technology.

According to the utility model provides a negative pressure centrifugal casting device, including the mould module, the mould module can wind the axis of rotation of self, the mould module is used for forming the casting die cavity with the combination of casting raw materials, casting hole and exhaust hole have been seted up to the mould module, casting hole be used for to casting die cavity injects molten liquid, exhaust hole intercommunication casting die cavity and external environment, the axis in exhaust hole with the axis of rotation has the contained angle, the exhaust hole is close to the one end of axis of rotation with casting die cavity intercommunication, the exhaust hole is kept away from the one end and the external environment intercommunication of axis of rotation.

According to the utility model provides a negative pressure centrifugal casting device has following technological effect at least: through setting up the mould module, put into the casting raw materials during the casting, the mould module rotates at a high speed, pours into the molten liquid into to the casting die cavity by the casting hole, realizes centrifugal casting, and the rotation of mould module produces centrifugal force, and centrifugal force makes the partial gas in the casting die cavity discharge from the exhaust hole to make the atmospheric pressure in the casting die cavity be less than atmospheric pressure, realize the negative pressure casting, the gas pocket bubble defect that forms when negative pressure centrifugal casting device can reduce the casting.

According to some embodiments of the present invention, the mold module includes a first mold component, a second mold component, the second mold component can be relatively kept away from or be close to the first mold component, the first mold component with be used for setting up the casting raw materials between the second mold component, the first mold component the second mold component is used for forming with the casting raw materials combination the casting cavity.

According to the utility model discloses a some embodiments, second mould subassembly includes lower mould, die holder, the lower mould sets up the die holder is close to one side of first mould subassembly, the die holder is seted up the exhaust hole.

According to some embodiments of the utility model, the first mould subassembly includes the mould, it sets up to go up the mould the casting hole.

According to the utility model discloses a some embodiments, negative pressure centrifugal casting device includes drive module, fixing base, drive module sets up on the fixing base, the mould module sets up drive module is last, drive module is used for the drive the mould module rotates.

According to some embodiments of the present invention, the drive module comprises a driver and a transmission assembly, the driver is in transmission connection with the transmission assembly, and the transmission assembly is in connection with the mold module.

According to some embodiments of the utility model, the transmission assembly includes lower round, rotatory guide pillar, the lower round transmission is connected the driver, rotatory guide pillar sets up on the lower round, rotatory guide pillar is connected the mould module, the driver drive the lower round rotates, the lower round passes through rotatory guide pillar drives the mould module rotates.

According to some embodiments of the utility model, the mould module includes the centre wheel, the centre wheel cover is established rotatory guide pillar is last.

According to some embodiments of the utility model, the mould module includes the upper wheel, the one end of rotatory guide pillar is connected the lower wheel, the other end of rotatory guide pillar is connected the upper wheel.

According to some embodiments of the utility model, drive assembly includes the initiative axle sleeve, the driver passes through belt drive and connects the initiative axle sleeve, the lower round sets up on the driving shaft sleeve.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is an isometric view of a negative pressure centrifugal casting apparatus provided in accordance with the present invention;

fig. 2 is an exploded view of a negative pressure centrifugal casting apparatus according to the present invention;

FIG. 3 is a cross-sectional view of a negative pressure centrifugal casting apparatus provided in accordance with the present invention;

FIG. 4 is an isometric view of a lower die holder provided in accordance with the present invention;

fig. 5 is an isometric view of an active bushing provided in accordance with the present invention;

fig. 6 is an isometric view of a push rod provided in accordance with the present invention;

fig. 7 is an isometric view of a ejector pin sleeve according to the present invention.

Reference numerals:

a fixed seat 1,

A lower die 21, a lower die seat 22, an exhaust hole 221, a middle wheel 23,

An upper die 31, a casting hole 311, an upper wheel 32, a fan blade 33,

The device comprises a lower wheel 41, a rotating guide post 42, a driving shaft sleeve 43, a bearing seat 44, a mandril 45, a driven shaft sleeve 46 and a mandril sleeve 47.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

According to the utility model provides a negative pressure centrifugal casting device, including the mould module, the mould module can wind the axis of rotation of self, the mould module is used for forming the casting die cavity with the combination of casting raw materials, casting hole 311 and exhaust hole 221 have been seted up to the mould module, casting hole 311 is used for pouring into molten liquid to the casting die cavity, exhaust hole 221 communicates casting die cavity and external environment, the axis and the axis of rotation of exhaust hole 221 have the contained angle, exhaust hole 221 is close to the one end and the casting die cavity intercommunication of axis of rotation, the one end and the external environment intercommunication of axis of rotation are kept away from to exhaust hole 221.

The centrifugal casting method is widely applied to the motor rotor processing technology of the motor because the problems of poor concentricity, low density, air hole bubbles and the like existing in the die casting method are improved, and the specific content of the centrifugal casting method can refer to the prior application of the applicant, namely the centrifugal casting method of the motor rotor of the invention with the application number of 20510299648.8.

According to the utility model provides a negative pressure centrifugal casting device, through setting up the mould module, put into rotor core when carrying out electric motor rotor negative pressure centrifugal casting, the mould module rotates at a high speed, pour into the aluminium water into to the casting die cavity by casting hole 311, the rotation of mould module produces centrifugal force, centrifugal force makes the aluminium water design at the casting die cavity according to the form when designing on the one hand, on the other hand exhaust hole 221's axis and axis of rotation nonparallel, centrifugal force makes the partial gas in the casting die cavity throw away from exhaust hole 221, thereby make the atmospheric pressure in the casting die cavity be less than atmospheric pressure, build negative pressure environment in the casting die cavity, realize electric motor rotor's negative pressure centrifugal casting, the gas pocket bubble defect that forms when negative pressure centrifugal casting device can reduce the casting. And the negative pressure centrifugal casting device does not need to repeatedly carry out vacuumizing operation, can reduce the influence on the production takt, and is suitable for the production and processing of mass products.

The negative pressure centrifugal casting device can be used for negative pressure centrifugal casting of the motor rotor and can also be used for negative pressure centrifugal casting of other parts. In the production of the motor rotor, the raw material for casting is generally a rotor core, and the molten liquid is generally molten aluminum water.

According to some embodiments of the utility model, the mould module includes first mould subassembly, second mould subassembly, and the second mould subassembly can be kept away from relatively or be close to first mould subassembly, is used for setting up the casting raw materials between first mould subassembly and the second mould subassembly, and first mould subassembly, second mould subassembly are used for forming the casting die cavity with the casting raw materials combination. The second mould subassembly is kept away from first mould subassembly, puts into the mould module as the rotor core of casting raw materials, and first mould subassembly and second mould subassembly clip rotor core and drive rotor core and rotate together, realize the casting production and processing of rotor. Of course, the mold module can be provided with more mold assemblies according to different products, so that the mold module is suitable for processing products with complex shapes.

In some embodiments, the second mold assembly includes a lower mold 21 and a lower mold base 22, the lower mold 21 is disposed on a side of the lower mold base 22 close to the first mold assembly, and the lower mold base 22 is opened with a vent hole 221. For example, as shown in fig. 3 and 4, the rotor core is placed on the lower mold 21, and the second mold assembly is moved upward so that the first mold assembly and the second mold assembly sandwich the rotor core. The exhaust hole 221 is formed in the side face of the lower die base 22, and when the die module rotates, a part of gas in the casting cavity is exhausted from the exhaust hole 221 under the action of centrifugal force, so that a negative pressure environment is created. When the motor rotor is subjected to negative pressure centrifugal casting, the mold module firstly rotates at a high speed, then the casting cavity is filled with the molten aluminum through the casting hole, and the molten aluminum in the casting cavity cannot flow into the exhaust hole 221 through the design of the shape of the casting cavity and the position of the exhaust hole 221 by virtue of centrifugal force, so that the gas in the casting cavity can be smoothly discharged from the exhaust hole 221.

According to some embodiments of the present invention, the first mold assembly comprises an upper mold 31, and the upper mold 31 is provided with a casting hole 311. For example, as shown in fig. 3, a casting hole 311 is opened in the center of the upper mold, and molten aluminum is poured into the casting cavity from above during casting.

According to the utility model discloses a some embodiments, negative pressure centrifugal casting device includes drive module, fixing base 1, and drive module sets up on fixing base 1, and the mould module sets up on drive module, and drive module is used for driving the mould module and rotates. In some embodiments, the drive module includes a driver drivingly connected to the drive assembly and a drive assembly connected to the mold module. The driver drives the transmission assembly to drive the mold module to rotate at a high speed.

In some embodiments, the transmission assembly includes a lower wheel 41, a rotating guide post 42, the lower wheel 41 is in transmission connection with a driver, the rotating guide post 42 is disposed on the lower wheel 41, the rotating guide post 42 is connected with the mold module, the driver drives the lower wheel 41 to rotate, and the lower wheel 41 drives the mold module to rotate through the rotating guide post 42. For example, as shown in fig. 2 and 3, in some embodiments, three rotating guide posts 42 are inserted on the lower wheel 41, when the lower wheel 41 rotates, the rotating guide posts 42 revolve around a rotating shaft, and the rotating guide posts 42 are connected with the mold module, so as to drive the mold module to rotate.

In some embodiments, the mold module includes a center wheel 23, and the center wheel 23 is fitted over the rotating guide post 42. In some embodiments, the mold modules include an upper wheel 32, with one end of a rotating guide post 42 connected to the lower wheel 41 and the other end of the rotating guide post 42 connected to the upper wheel 32. For example, as shown in fig. 3, in some embodiments, the upper wheel 32 is disposed on the upper die 31, the middle wheel 23 is disposed on the lower die holder 22, the rotating guide post 42 is inserted into the middle wheel 23, one end of the rotating guide post 42 is screwed onto the lower wheel 41, the other end of the rotating guide post 42 is screwed onto the upper wheel 32, and the rotating guide post 42 drives the first die assembly and the second die assembly to rotate synchronously.

In some embodiments, the drive assembly includes a drive sleeve 43, the drive is connected to the drive sleeve 43 by a belt drive, and the lower wheel 41 is disposed on the drive sleeve 43. For example, as shown in fig. 2, in some embodiments, the transmission assembly includes a bearing seat 44 disposed on the fixing base 1, the driving shaft sleeve 43 is rotatably inserted into the bearing seat 44, one end of the driving shaft sleeve 43 is connected to the pulley, the other end of the driving shaft sleeve 43 is screwed on the lower wheel 41, and the driver drives the pulley to rotate through the belt transmission, so as to drive the lower wheel 41 to rotate.

According to some embodiments of the present invention, the drive module includes a driven sleeve 46 for driving the first and second mold assemblies to move relative to each other, the driven sleeve 46 connecting the second mold assembly. The drive module drives the driven sleeve shaft 46 in a rotational axis direction to move the second mold assembly toward or away from the first mold assembly. According to some embodiments of the present invention, the driving module further comprises a push rod 45, the push rod 45 is movably inserted in the mold module, and the push rod 45 is used for ejecting the product after the casting process is completed. The ejector pins can facilitate demolding of the product from the mold assembly. In some embodiments, the driving module includes a jack sleeve 47, the jack sleeve 47 is inserted and installed on the driven sleeve shaft 46, and the jack 45 is inserted into the jack sleeve 47. The driving module can drive the push rod 45 and the driven sleeve shaft 46 to move relatively along the direction of the rotating shaft. For example, as shown in fig. 2, 3, 6, and 7, a concave-convex structure for guiding is disposed between the ejector rod sleeve 47 and the ejector rod 45, a through hole is formed in the center of the lower die 21, after the motor rotor is machined, the driven sleeve shaft 46 drives the first die assembly and the second die assembly to separate from each other, and the ejector rod 45 moves upward relative to the driven sleeve shaft 46 to push the machined motor rotor. The top rod 45 can loosen the combination between the motor rotor and the lower die 21 through acting force, or the top rod 45 can also directly push the motor rotor away from the lower die 21, so that the motor rotor is convenient to take out.

In some embodiments, the negative pressure centrifugal casting apparatus is provided with heat sink fins, for example, in some embodiments, heat sink fins are molded on the upper wheel 32, the middle wheel 23, and the lower wheel 41. The radiating fins can increase the radiating area, and the aluminum water can be cooled quickly. In some embodiments, the mold module is provided with fan blades. For example, as shown in fig. 2 and 3, the mold module includes two blades 33, one of the blades 33 is disposed on the upper wheel 32, the other blade 33 is disposed on the lower mold base 22, and the blade fins are molded on the blades 33, so that heat of the molten liquid is transferred to the blades 33 during casting, and the blade fins enable the blades 33 to generate airflow during rotation, thereby promoting heat dissipation and accelerating the cooling process. When the aluminum water is cast, the temperature of the aluminum water is required to be reduced to below 300 ℃ from about 700 ℃, the process can be accelerated by arranging the heat dissipation fins and the fan blade fins, the production beat is accelerated, and the production efficiency is improved.

The following describes in detail the negative pressure centrifugal casting apparatus provided according to the present invention in a specific embodiment with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.

The negative pressure centrifugal casting device comprises a mould module, a driving module and a fixed seat 1. The drive module is arranged on the fixed seat 1, and the die module is arranged on the drive module. The mold modules themselves have rotational axes.

The driving module comprises a driver, a lower wheel 41, rotating guide pillars 42, a driving shaft sleeve 43, a bearing seat 44, a mandril 45, a driven shaft sleeve 46 and a mandril sleeve 47, the bearing seat 44 is arranged on the fixed seat 1, the driving shaft sleeve 43 is rotatably inserted in the bearing seat 44, one end of the driving shaft sleeve 43 is connected with the driver through belt transmission, the other end of the driving shaft sleeve 43 is fastened on the lower wheel 41 through threads, the three rotating guide pillars 42 are inserted on the lower wheel 41, and the driver drives the driving shaft sleeve 43 and the lower wheel 41 to rotate through the belt transmission, so that the rotating guide pillars 42 are driven to revolve. The lower wheel 41 is formed with heat radiating fins. The driven sleeve shaft 46 penetrates through the lower wheel 41 and is inserted into the driving sleeve 43, the ejector rod sleeve 47 is inserted and installed on the driven sleeve shaft 46, the ejector rod 45 is inserted into the ejector rod sleeve 47, and a concave-convex structure for guiding is arranged between the ejector rod sleeve 47 and the ejector rod 45. The driving module can drive the driven sleeve shaft 46 to move along the direction of the rotating shaft, the driving module can drive the push rod 45 to move along the direction of the rotating shaft, and the driving module can drive the push rod 45 and the driven sleeve shaft 46 to move relatively along the direction of the rotating shaft.

The mould module includes first mould subassembly and second mould subassembly, and first mould subassembly includes mould 31 and upper wheel 32, and upper wheel 32 sets up on rotatory guide pillar 42, and the shaping of upper wheel 32 has radiating fin, and last mould 31 sets up the one side that is close to the second mould subassembly at upper wheel 32, and the center of going up mould 31 upwards extends and passes upper wheel 32, and the center of going up mould 31 has seted up casting hole 311.

The second die assembly comprises a lower die 21, a lower die holder 22 and a middle wheel 23, wherein the middle wheel 23 is arranged on a driven sleeve shaft 46, radiating fins are formed on the middle wheel 23, a rotary guide pillar 42 is inserted into the middle wheel 23, an ejector rod 45 is inserted into a through hole of the middle wheel 23, the lower die holder 22 is arranged on the middle wheel 23, and the lower die 21 is arranged on the lower die holder 22.

The mould module comprises two fan blades 33, wherein one fan blade 33 is arranged on the upper wheel 32, the other fan blade 33 is arranged on the lower mould base 22, and fan blade fins are formed on the fan blades 33.

When the casting mold is used, a casting material such as a rotor core is placed on the lower mold 21, the driven sleeve shaft 46 pushes the first mold assembly and the second mold assembly to clamp the rotor core, and the upper mold 31, the rotor core, the lower mold 21 and the lower mold base 22 together form a casting cavity. The lateral wall of lower die holder 22 is last to be seted up a plurality of and to be linked together the exhaust hole 221 in external environment and casting die cavity, and exhaust hole 221 inclines in the axis of rotation setting, and the axis of rotation nonparallel of exhaust hole 221, the one end and the casting die cavity intercommunication that exhaust hole 221 is close to the axis of rotation, and the one end and the external environment intercommunication of axis of rotation are kept away from to exhaust hole 221.

The mould module rotates at a high speed, and by casting hole 311 to the casting die cavity pouring aluminium water, the rotation of mould module produces centrifugal force, and centrifugal force makes the aluminium water stereotype in the casting die cavity according to the form when designing on the one hand, and on the other hand makes the partial gas in the casting die cavity discharge from exhaust hole 221 to make the atmospheric pressure in the casting die cavity be less than atmospheric pressure, build negative pressure environment in the casting die cavity, realize electric motor rotor's negative pressure centrifugal casting.

According to the utility model discloses negative pressure centrifugal casting device through the design more than adopting, can realize such some functions at least: through the specific structure of design, realize negative pressure centrifugal casting technology, negative pressure centrifugal casting device can reduce the gas pocket bubble defect that forms during the casting. And the negative pressure centrifugal casting device does not need to repeatedly carry out vacuumizing operation, can reduce the influence on the production takt, and is suitable for the production and processing of mass products.

The driving module can stably drive the die module to rotate at a high speed through belt transmission, and the rotating guide pillar 42 drives the first die assembly and the second die assembly to rotate synchronously, so that the defect of machining precision caused by asynchronous rotation is reduced. The driving module can also drive the first mold assembly and the second mold assembly to stably clamp the rotor core.

The radiating fins can increase the radiating area, and the fan blade fins can generate air flow, so that the aluminum water can be rapidly cooled.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A negative pressure centrifugal casting device, comprising:

the mould module, the mould module can be around the axis of rotation of self, the mould module is used for forming the casting die cavity with the combination of casting raw materials, casting hole (311) and exhaust hole (221) have been seted up to the mould module, casting hole (311) be used for to casting die cavity pours into molten liquid, exhaust hole (221) intercommunication casting die cavity and external environment, the axis in exhaust hole (221) with the axis of rotation has the contained angle, exhaust hole (221) are close to the one end of axis of rotation with casting die cavity intercommunication, exhaust hole (221) are kept away from the one end and the external environment intercommunication of axis of rotation.

2. The negative-pressure centrifugal casting apparatus of claim 1, wherein: the mould module comprises a first mould component and a second mould component, the second mould component can be relatively far away from or close to the first mould component, a casting raw material is arranged between the first mould component and the second mould component, and the first mould component and the second mould component are used for being combined with the casting raw material to form the casting cavity.

3. The negative-pressure centrifugal casting apparatus of claim 2, wherein: the second die assembly comprises a lower die (21) and a lower die seat (22), the lower die (21) is arranged on one side, close to the first die assembly, of the lower die seat (22), and the exhaust hole (221) is formed in the lower die seat (22).

4. The negative-pressure centrifugal casting apparatus of claim 2, wherein: the first mold component comprises an upper mold (31), and the upper mold (31) is provided with the casting hole (311).

5. The negative-pressure centrifugal casting apparatus according to claim 1 or 2, wherein: the negative pressure centrifugal casting device comprises a driving module and a fixing seat (1), wherein the driving module is arranged on the fixing seat (1), the mould module is arranged on the driving module, and the driving module is used for driving the mould module to rotate.

6. The negative-pressure centrifugal casting apparatus of claim 5, wherein: the driving module comprises a driver and a transmission assembly, the driver is in transmission connection with the transmission assembly, and the transmission assembly is connected with the mold module.

7. The negative-pressure centrifugal casting apparatus of claim 6, wherein: the transmission assembly comprises a lower wheel (41) and a rotary guide post (42), the lower wheel (41) is in transmission connection with the driver, the rotary guide post (42) is arranged on the lower wheel (41), the rotary guide post (42) is connected with the die module, the driver drives the lower wheel (41) to rotate, and the lower wheel (41) drives the die module to rotate through the rotary guide post (42).

8. The negative-pressure centrifugal casting apparatus of claim 7, wherein: the die module comprises a middle wheel (23), and the middle wheel (23) is sleeved on the rotary guide pillar (42).

9. The negative-pressure centrifugal casting apparatus of claim 7, wherein: the die module comprises an upper wheel (32), one end of the rotary guide column (42) is connected with the lower wheel (41), and the other end of the rotary guide column (42) is connected with the upper wheel (32).

10. The negative-pressure centrifugal casting apparatus of claim 9, wherein: the transmission assembly comprises a driving shaft sleeve (43), the driver is connected with the driving shaft sleeve (43) through belt transmission, and the lower wheel (41) is arranged on the driving shaft sleeve (43).

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