CN219924526U

CN219924526U - Apparatus for casting rotors

Info

Publication number: CN219924526U
Application number: CN202321076756.5U
Authority: CN
Inventors: 郑广会; 张铃; 郑帅辰; 郑金泽
Original assignee: Tianweilan Electric Drive Technology Jiangsu Co ltd
Current assignee: Tianweilan Electric Drive Technology Jiangsu Co ltd
Priority date: 2023-05-08
Filing date: 2023-05-08
Publication date: 2023-10-31
Anticipated expiration: 2033-05-08

Abstract

The utility model relates to the technical field of motor production, and discloses equipment for casting a rotor, which comprises a casting main body and a pressing block, wherein a casting mould is formed in the casting main body, the pressing block is used for applying pressure to a malleable cast substance under the condition that the malleable cast substance is filled in the casting mould, a cooling runner is formed in the casting main body, and a plurality of cooling areas with different cooling speeds are formed along the direction of the pressing block applying pressure. The rotor has the advantages of high strength, low conductivity and high strength; the rotor with higher conductivity and lower strength.

Description

Apparatus for casting rotors

Technical Field

The present utility model relates to the field of motor production, and in particular to an apparatus for casting rotors.

Background

A squirrel-cage motor is one of three-phase asynchronous motors, and the squirrel-cage rotor is the rotating part of the squirrel-cage motor. In general, a rotor coil made of copper or aluminum is cast in a cage-shaped slot on a rotor core, and the coil is a closed loop which is not connected with other parts, and mainly aims to restrain stator current. Currently, common casting methods include high pressure casting and centrifugal casting.

High pressure casting is to press molten aluminum or copper into a metal mold at a very high speed and crystallize it under pressure. The size of the crystal grains of the casting obtained by high-pressure casting is smaller, so that the rotor has higher strength; however, the low density of castings obtained by high pressure casting results in low electrical conductivity, which is undesirable in rotor applications. In addition, high-pressure casting consumes large amounts of equipment and energy, and is costly and difficult to operate.

In centrifugal casting, molten aluminum or molten copper is poured into a mold rotating at a high speed, so that the molten metal is centrifugally moved to fill the mold and form a casting. The density and the conductivity of the castings obtained by centrifugal casting are high; however, centrifugal casting results in a casting with a larger grain size, resulting in a casting with lower strength; in addition, since the centrifugal casting mold needs to be rotated, it is difficult to provide a device for rapidly controlling the temperature thereof, and thus the tact time thereof is slow and the production cost thereof is high.

Aiming at the related technology, the inventor considers that the rotor cast by two casting modes has certain problems, and the rotor cast by high pressure has higher strength and lower conductivity; centrifugally cast rotors have higher electrical conductivity and lower strength.

Disclosure of Invention

In order to alleviate the problem of certain drawbacks of both high pressure cast rotors and centrifugally cast rotors, the present utility model provides an apparatus for casting rotors.

The utility model provides equipment for casting a rotor, which adopts the following technical scheme:

an apparatus for casting a rotor includes a casting body having a mold formed therein and a compact for applying pressure to a malleable substance with the malleable substance filled into the mold, the casting body having a cooling runner formed therein, the cooling runner forming a plurality of cooling areas of different cooling rates in a direction in which the compact applies pressure.

By adopting the technical scheme, after the forgeable matter is filled into the casting mould, the pressing block is utilized to apply pressure to the forgeable matter in the casting mould, so that the forgeable matter is crystallized under the action of the pressure, and the grain size of the casting is reduced; meanwhile, a plurality of cooling areas with different cooling speeds are formed by arranging cooling flow channels in the casting main body, so that the temperature in the casting mould can be controlled in a region-by-region manner in the direction of applying pressure along the pressing block, the malleable cast substance far away from one end of the pressing block is firstly solidified by adjusting the temperature of the cooling areas, the pressure provided by the pressing block is matched, the possibility of forming loose tissues such as shrinkage cavities or bubbles in the casting is reduced, and the compactness of the casting is improved.

Optionally, the casting main part includes mould, lower mould and additional cooling device, additional cooling device is located between mould and the lower mould, the briquetting is exerted pressure by last mould one end to lower mould one end, the cooling runner includes first cooling runner and second cooling runner, first cooling runner is seted up on the additional cooling device, first cooling runner forms first cooling region, the second cooling runner is seted up on the lower mould, the second cooling runner forms second cooling region.

By adopting the technical scheme, the first cooling flow channel is formed on the additional cooling device, a first cooling area is formed in the casting mould by using the first cooling flow channel, the second cooling flow channel is formed on the lower mould, and a second cooling area is formed in the casting mould by using the second flow channel; in the casting process, the flow rates of the cooling liquid in the first cooling runner and the second cooling runner are regulated to enable the temperature of the second cooling area to be lower than that of the first cooling area, so that the malleable substance near one end of the lower die is solidified first.

Optionally, the first cooling flow passage includes a plurality of sub-cooling flow passages, and the plurality of sub-cooling flow passages form a plurality of sub-cooling areas with different cooling speeds along the direction in which the pressing force is applied to the pressing block.

Through adopting above-mentioned technical scheme, offer a plurality of sub-cooling flow channels on additional cooling device, utilize a plurality of sub-cooling flow channels to form a plurality of cooling rate different sub-cooling areas, further divide the mould space, improve the effect of cooling step by step.

Optionally, a plurality of the sub-cooling flow passages are independently provided.

By adopting the technical scheme, the plurality of sub-cooling flow channels are mutually independent, and the temperature of the sub-cooling area formed by the sub-cooling flow channels can be adjusted by adjusting the flow rate of the cooling liquid in the sub-cooling flow channels.

Optionally, the second cooling flow channel and the plurality of sub cooling flow channels have different flow channel cross sectional areas.

By adopting the technical scheme, the cross-sectional areas of the second cooling flow channel and the plurality of sub cooling flow channels are different, and when the cooling liquid is pumped into the second cooling flow channel and the plurality of sub cooling flow channels under the same pressure, the flow rates of the cooling liquid in the second cooling flow channel and the plurality of sub cooling flow channels are different, so that cooling areas with different cooling speeds are formed.

Optionally, the cooling rate of the plurality of cooling regions increases gradually in the direction in which the compacts apply pressure.

Optionally, the cooling flow channel is a spiral flow channel.

Optionally, the additional cooling device is integrally provided with the upper die or the lower die.

Through adopting above-mentioned technical scheme, additional cooling device sets up with last mould an organic whole or additional cooling device sets up with lower mould an organic whole, improves the convenience of casting main part assembly.

Optionally, the surface of the pressing block is provided with an anti-sticking coating.

By adopting the technical scheme, the anti-sticking material is coated on the surface of the pressing block to form the anti-sticking coating, so that the possibility of adhesion between the pressing block and the malleable casting material is reduced.

Optionally, the pressing block is connected with a press, and the pressure provided by the press is 1000KN-3000KN.

By adopting the technical scheme, the pressing block is connected with the press, and the pressing block applies pressure to the malleable cast material in the casting mould under the drive of the press.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. the pressure is applied to the forgeable matter in the casting mould by utilizing the pressing block, so that the forgeable matter is crystallized under the action of the pressure, the grain size of the casting is reduced, and the strength of the casting is improved; meanwhile, through adjusting the temperature of the cooling area, the malleable cast material far away from one end of the pressing block is solidified first, and the pressure provided by the pressing block is matched, so that the possibility of forming loose tissues such as shrinkage cavities or bubbles in the casting is reduced, and the density of the casting is improved;

2. a plurality of sub cooling flow channels are formed on the additional cooling device, a plurality of sub cooling areas with different cooling speeds are formed by the plurality of sub cooling flow channels, the casting mould space is further divided, and the effect of gradual cooling is improved;

3. the anti-sticking coating is formed by coating the anti-sticking material on the surface of the pressing block, so that the possibility of adhesion between the pressing block and the malleable casting material is reduced.

Drawings

FIG. 1 is a schematic overall construction of a first embodiment of the present utility model (some of the structural features are omitted from the drawing);

FIG. 2 is a cross-sectional view of a first embodiment of the utility model;

FIG. 3 is a cross-sectional view of a second embodiment of the present utility model;

fig. 4 is a cross-sectional view of a third embodiment of the present utility model.

Reference numerals: 100. casting a main body; 110. an upper die; 120. a lower die; 130. adding a cooling device; 200. briquetting; 300. casting mould; 400. a first cooling flow passage; 410. sub-cooling flow channels; 411. a flow channel inlet; 412. a flow channel outlet; 500. and a second cooling flow passage.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-4.

An embodiment of the utility model discloses an apparatus for casting a rotor. The axial direction described in the embodiment is the axial direction of the additional cooling device 130 unless otherwise specified.

Example 1

Referring to fig. 1 and 2, an apparatus for casting a rotor includes a casting body 100, a press, and a compact 200.

The casting body 100 includes an upper mold 110, an additional cooling device 130, and a lower mold 120. The additional cooling device 130 is in a cylindrical shape with two open ends, the axis of the additional cooling device 130 is vertically arranged, and the additional cooling device 130 is coaxially sleeved on the outer side of the rotor core. The upper mold 110 is covered over the rotor core, the lower mold 120 is covered under the rotor core, and the mold 300 for accommodating the malleable substance is formed by the cooperation of the upper mold 110 and the lower mold 120 with the rotor core.

Referring to fig. 2, the press block 200 is fixedly connected to a driving end of a press, the press drives the press block 200 to move in an axial direction, and the press can provide a pressure of 1000KN-3000KN. The upper end of upper mold 110 is provided with a sprue through which compact 200 may be introduced into mold 300.

After the malleable material is injected into mold 300 through the gate, press ram 200 is driven into mold 300 through the gate. Briquette 200 applies pressure to the malleable mass within mold 300 to crystallize the malleable mass, e.g., molten metallic mass such as liquid aluminum, liquid copper, etc., under pressure, reducing the grain size of the casting and thereby increasing the strength of the casting.

The surface of the pressing block 200 is coated with a high-temperature-resistant anti-sticking material, and ZS-522 high-temperature-resistant self-cleaning non-sticking coating of Beijing Zhi Cheng Weihua chemical industry Co., ltd is selected as the anti-sticking material in the embodiment, so that an anti-sticking coating is formed. Reducing the likelihood of sticking to the malleable mass during application of pressure to the malleable mass by compact 200.

The pressing block 200 is connected with a heating device. The temperature of compact 200 may be controlled by a heating device during the application of pressure by compact 200 to the malleable material to further reduce the likelihood of the malleable material sticking to compact 200. In addition, the upper portion of the castable material in the mold 300 may be heated by the briquette 200 so that the upper portion of the castable material in the mold 300 may have a higher temperature than the lower portion.

Referring to fig. 1 and 2, the casting body 100 is provided with a spiral cooling runner, the axis of which is collinear with the axis of the additional cooling device 130, and the malleable substance in the casting mold 300 is cooled by pouring a cooling liquid into the cooling runner.

The cooling flow path includes a first cooling flow path 400 opened in the additional cooling device 130 and a second cooling flow path 500 opened in the lower mold 120. The first cooling runner 400 forms a first cooling zone within the mold 300 and the second cooling runner 500 forms a second cooling zone within the mold 300. During casting, the flow rates of the cooling liquid in the first cooling runner 400 and the second cooling runner 500 are adjusted to make the temperature of the second cooling area lower than that of the first cooling area, so that the malleable cast material near one end of the lower die 120 is solidified first; and the pressure provided by the pressing block 200 is matched, so that the possibility of forming loose tissues such as shrinkage cavities or bubbles in the casting is reduced, and the compactness of the casting is improved.

Referring to fig. 1 and 2, the first cooling flow passage 400 includes a plurality of (three in this embodiment) sub-cooling flow passages 410, and the three sub-cooling flow passages 410 are arranged at intervals in the axial direction, thereby forming three sub-cooling regions. During casting, the flow rates of the cooling liquid in the three sub-cooling channels 410 are adjusted to gradually increase the temperatures of the three sub-cooling areas from bottom to top, so that the space of the casting mold 300 is further divided, and the gradual cooling effect is improved. The three sub-cooling channels 410 are independent of each other, and each sub-cooling channel includes a channel inlet 411 and a channel outlet 412 formed in the additional cooling device 130. The flow channel inlet 411 of the same sub-cooling flow channel 410 is located below the flow channel outlet 412. The cooling fluid enters the sub-cooling channels 410 through the channel inlets 411 and, after spirally surrounding the mold 300 for at least one week, flows out of the sub-cooling channels 410 through the channel outlets 412. The temperature of the cooling liquid gradually increases during the flow of the cooling liquid in the cooling flow passage 410. By providing the flow channel inlet 411 below the flow channel outlet 412, the cooling rate of the lower part is made greater than the cooling rate of the upper part in the same sub-cooling area.

Example two

Referring to fig. 3, the second embodiment of the present utility model is mainly different from the first embodiment in that:

the additional cooling device 130 is integrally formed with the lower die 120. The second cooling flow passage 500 communicates with the three sub-cooling flow passages 410, and the flow passage cross-sectional area of the second cooling flow passage 500 is smaller than that of the sub-cooling flow passages 410, and the flow passage cross-sectional areas of the three sub-cooling flow passages 410 are gradually increased from bottom to top. During casting, when the cooling liquid is pumped into the second cooling flow passage 500 and the plurality of sub-cooling flow passages 410 at the same pressure, the flow rates of the cooling liquid in the second cooling flow passage 500 and the plurality of sub-cooling flow passages 410 are different, thereby forming cooling regions of different cooling rates.

Example III

Referring to fig. 4, the third embodiment of the present utility model differs from the first embodiment mainly in that:

the additional cooling device 130 is integrally formed with the upper die 110.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model. For example:

the sub-cooling flow channels 410 may be formed in the upper mold 110, and sub-cooling areas may be formed in the upper mold 110 to further divide the space of the mold 300; briquette 200 may or may not be in contact with the malleable material during pressurization, and in the event that briquette 200 is not in contact with the malleable material, briquette 200 may be caused to exert pressure on the gas above the malleable material by a reasonable seal, which may further transfer the pressure to the malleable material.

Claims

1. An apparatus for casting a rotor, characterized by: the casting device comprises a casting main body (100) and a pressing block (200), wherein a casting mould (300) is formed in the casting main body (100), the pressing block (200) is used for applying pressure to a malleable cast substance under the condition that the malleable cast substance is filled into the casting mould (300), a cooling flow passage is formed in the casting main body (100), and a plurality of cooling areas with different cooling speeds are formed along the direction of the pressing block (200) applying pressure.

2. An apparatus for casting a rotor as claimed in claim 1 wherein: the casting main body (100) comprises an upper die (110), a lower die (120) and an additional cooling device (130), wherein the additional cooling device (130) is located between the upper die (110) and the lower die (120), the pressing block (200) is pressed from one end of the upper die (110) to one end of the lower die (120), the cooling flow channel comprises a first cooling flow channel (400) and a second cooling flow channel (500), the first cooling flow channel (400) is arranged on the additional cooling device (130), the first cooling flow channel (400) forms a first cooling area, the second cooling flow channel (500) is arranged on the lower die (120), and the second cooling flow channel (500) forms a second cooling area.

3. An apparatus for casting a rotor as claimed in claim 2 wherein: the first cooling flow path (400) includes a plurality of sub-cooling flow paths (410), and the plurality of sub-cooling flow paths (410) form a plurality of sub-cooling regions having different cooling speeds along a direction in which the compact (200) applies pressure.

4. An apparatus for casting a rotor according to claim 3, wherein: a plurality of the sub-cooling flow passages (410) are independently provided.

5. An apparatus for casting a rotor according to claim 3, wherein: the second cooling flow passage (500) and the plurality of sub cooling flow passages (410) are different in flow passage cross-sectional area.

6. An apparatus for casting a rotor as claimed in claim 1 wherein: the structural design of the cooling area meets the following conditions:

the cooling rate of the plurality of cooling regions gradually increases in the direction in which the compact (200) applies pressure.

7. An apparatus for casting a rotor as claimed in claim 1 wherein: the cooling flow channel is a spiral flow channel.

8. An apparatus for casting a rotor as claimed in claim 2 wherein: the additional cooling device (130) is integrally provided with the upper die (110) or the lower die (120).

9. An apparatus for casting a rotor as claimed in claim 1 wherein: the surface of the pressing block (200) is provided with an anti-sticking coating.

10. An apparatus for casting a rotor as claimed in claim 1 wherein: the pressing block (200) is connected with a press machine, and the pressure provided by the press machine is 1000KN-3000KN.