Double-sided pressure casting process for aluminum row rotor

Abstract

The invention discloses a double-sided pressure casting process for an aluminum row rotor. The double-sided pressure casting process comprises the following steps: S1, casting a cast-aluminum rotor groove type conducting bar by using a mold in advance; s2, detecting the groove type conducting bar of the rotor; s3, putting the qualified rotor groove type conducting bar into the rotor iron core groove type; s4, casting and forming the aluminum row rotor: putting the cast-aluminum rotor iron core into a casting mold main body consisting of a cast-aluminum rotor upper end ring, a cast-aluminum rotor lower end ring and a cast-aluminum rotor middle ring, and respectively putting two ends of a rotor groove type guide bar into end ring cavities of the cast-aluminum rotor upper end ring and the cast-aluminum rotor lower end ring; molten aluminum liquid is injected into the mold cavity of the casting mold body through the casting feeding port, gas originally existing in the cast-aluminum rotor end ring is exhausted through the casting exhaust port, and cooling forming is conducted. According to the invention, the quality of the cast-aluminum rotor iron core groove type conducting bar is effectively controlled, and the quality problems of slim bars and broken bars of centrifugal cast-aluminum and pressure cast-aluminum rotor iron core conducting bars are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cast aluminum rotor casting, and particularly relates to a double-sided pressure casting process for an aluminum bar rotor. Background Art

[0002] The rotor of an asynchronous motor is usually composed of stacked silicon steel sheets and aluminum bars. The bars form a "squirrel cage" structure through short-circuiting by end rings. Technologically, there are two types of cast aluminum rotor cores, namely centrifugal cast aluminum and pressure cast aluminum, and both of these processes are formed in one step during the aluminum casting process.

[0003] Both the centrifugal cast aluminum and pressure cast aluminum processes are formed in one step during the aluminum casting process. Although the quality of the rotor slot bars (whether there are broken bars) of the cast aluminum rotor core can be detected by a special device after the aluminum casting is completed, since the rotor core has already been formed, if quality problems are found, the scrapping cost is too high. Therefore, casting the rotor slot bars first and then casting the rotor core end rings can effectively control the quality of the rotor slot bars of the cast aluminum rotor core. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a double-sided pressure casting process for an aluminum bar rotor, which can effectively control the quality of the rotor slot bars of the cast aluminum rotor core and improve the casting quality of the aluminum bar rotor.

[0005] To solve the above technical problem, the present invention adopts the following technical solution: A double-sided pressure casting process for an aluminum bar rotor, comprising the following steps: S1: Pre-cast the rotor slot bars of the cast aluminum rotor using a mold; S2: Detect the rotor slot bars; S3: Place the qualified rotor slot bars into the rotor core slots; S4: Form the aluminum bar rotor: Place the cast aluminum rotor core into the main body of the casting mold composed of the upper end ring of the cast aluminum rotor, the lower end ring of the cast aluminum rotor, and the middle ring of the cast aluminum rotor. The two ends of the rotor slot bars are respectively placed into the end ring cavities of the upper end ring of the cast aluminum rotor and the lower end ring of the cast aluminum rotor. Inject the molten aluminum liquid into the mold cavity of the main body of the casting mold through the casting feed port. The gas originally present in the cast aluminum rotor end ring is discharged through the casting exhaust port, and then it can be cooled and formed.

[0006] Further, when casting the rotor slot bars of the cast aluminum rotor in step S1, guide bar card slots are reserved at both ends of the rotor slots; the distance between the two guide bar card slots on both sides is greater than the height of the rotor core.

[0007] Further, in step S4, the temperature of the molten aluminum liquid is 700°C - 720°C.

[0008] Further, in step S4, the solid aluminum remaining at the casting exhaust port is removed manually later.

[0009] Further, the end ring forming die includes a casting die; the casting die includes an upper end ring of the cast aluminum rotor, a lower end ring of the cast aluminum rotor, and a middle ring of the cast aluminum rotor; The middle ring of the cast aluminum rotor is in a cylindrical structure, located between the upper end ring of the cast aluminum rotor and the lower end ring of the cast aluminum rotor, and the upper and lower ends of the middle ring of the cast aluminum rotor are respectively and tightly connected to the lower end face of the upper end ring of the cast aluminum rotor and the upper end face of the lower end ring of the cast aluminum rotor; The upper end ring of the cast aluminum rotor is used for the casting connection and forming of the end ring on one side of the aluminum bar rotor and the rotor slot-shaped bar; an upper annular cavity is arranged inside the upper end ring of the cast aluminum rotor; an exhaust hole communicating with the upper annular cavity is arranged at the top of the upper end ring of the cast aluminum rotor, for discharging the gas originally existing in the end ring of the cast aluminum rotor; The lower end ring of the cast aluminum rotor is used for the casting connection and forming of the end ring on the other side of the aluminum bar rotor and the rotor slot-shaped bar; a lower annular cavity is arranged inside the lower end ring of the cast aluminum rotor; a casting feed port communicating with the lower annular cavity is arranged at the bottom of the lower end ring of the cast aluminum rotor, for injecting molten aluminum liquid into the die cavity of the die.

[0010] Further, a hole formed inside the middle ring of the aluminum rotor forms a casting diversion tube.

[0011] Further, the cast aluminum rotor iron core is placed in a die composed of the upper end ring of the cast aluminum rotor, the lower end ring of the cast aluminum rotor, and the middle ring of the cast aluminum rotor. The two ends of the rotor slot-shaped bar are respectively located in the upper annular cavity and the lower annular cavity, and the upper end face and the lower end face of the cast aluminum rotor iron core are respectively in close contact with the lower end face of the upper end ring of the cast aluminum rotor and the upper end face of the lower end ring of the cast aluminum rotor.

[0012] The beneficial effects of the present invention are as follows: The present invention adopts the method of pre-casting the cast aluminum rotor slot-shaped bar, then placing the qualified cast aluminum rotor slot-shaped bar into the rotor core slot, and then casting the end ring, effectively controlling the quality of the cast aluminum rotor core slot-shaped bar, reducing the quality problems of thin bars and broken bars in the centrifugal cast aluminum and pressure cast aluminum rotor cores, and improving the casting quality of the aluminum bar rotor.

[0013] The present invention sets guide bar clamping grooves at both ends of the cast aluminum rotor guide bar, making the connection between the cast aluminum rotor end ring and the cast aluminum rotor guide bar firmer, and effectively preventing the cast aluminum rotor end ring from falling off. Description of the Drawings

[0014] The present invention will be further described below with reference to the drawings and embodiments.

[0015] Figure 1 It is a schematic structural diagram of the cast aluminum rotor guide bar of the present invention.

[0016] Figure 2 For Figure 1Cross-sectional view in the direction of A.

[0017] Figure 3 It is a schematic diagram of a double-sided casting die for a cast aluminum rotor.

[0018] Figure 4 It is a schematic diagram of the planar relationship between the end ring of the cast aluminum rotor and the guide bar of the cast aluminum rotor. Specific implementation manners

[0019] Next, the technical solution of the present invention will be clearly and completely described through specific implementation manners. Embodiment 1

[0020] A double-sided pressure casting process for an aluminum bar rotor in this embodiment includes the following steps: S1: Pre-cast the grooved guide bar of the cast aluminum rotor using a die; S2: Detect the grooved guide bar of the rotor; S3: Place the qualified grooved guide bar of the rotor into the rotor core groove; S4: Forming of the aluminum bar rotor: Place the cast aluminum rotor core into the main body of the casting die composed of the upper end ring of the cast aluminum rotor, the lower end ring of the cast aluminum rotor, and the middle ring of the cast aluminum rotor. The two ends of the grooved guide bar of the rotor are respectively placed into the end ring cavities of the upper end ring of the cast aluminum rotor and the lower end ring of the cast aluminum rotor. Inject the molten aluminum liquid at a temperature of 700°C - 720°C into the mold cavity of the main body of the casting die through the casting feed port. The gas originally present in the end ring of the cast aluminum rotor is discharged through the casting exhaust port, and then it can be cooled and formed. The solid aluminum remaining at the casting exhaust port and the diversion pipe is removed manually later.

[0021] When casting the grooved guide bar of the cast aluminum rotor in step S1, leave guide bar slots at both ends of the rotor groove; the distance between the two guide bar slots on both sides is greater than the height of the rotor core.

[0022] The present invention effectively controls the quality of the grooved guide bar of the cast aluminum rotor core by pre-casting the grooved guide bar of the cast aluminum rotor using a die, then connecting the grooved guide bar of the rotor to the end ring by casting after passing the detection, placing the qualified grooved guide bar of the cast aluminum rotor into the rotor core groove, and then casting the end ring, reducing the quality problems such as thin bars and broken bars that occur in the grooved guide bars of the centrifugal cast aluminum and pressure cast aluminum rotor cores, and improving the casting quality of the aluminum bar rotor. Embodiment 2

[0023] As Figures 1-4 shown, when double-sided pressure casting the aluminum bar rotor, first place the rotor core into the die, and the two ends of the grooved guide bar 2 of the rotor are cast-connected to the end rings 3 at both ends to form a closed loop, and the end ring forming die is used for forming during use.

[0024] The end ring forming die includes a casting die; the casting die includes an upper cast aluminum rotor end ring 11, a lower cast aluminum rotor end ring 12, and a middle cast aluminum rotor ring 13; The middle cast aluminum ring 13 is in a cylindrical structure, located between the upper cast aluminum rotor end ring 11 and the lower cast aluminum rotor end ring 12, and the upper and lower ends of the middle cast aluminum ring 13 are respectively tightly and fittingly connected to the lower end face of the upper cast aluminum rotor end ring 11 and the upper end face of the lower cast aluminum rotor end ring 12; a pore formed inside the middle aluminum rotor ring forms a casting diversion tube 18.

[0025] The upper cast aluminum rotor end ring 11 is used for the casting connection and forming of the end ring on one side of the aluminum bar rotor and the rotor slot-shaped guide bar; an upper annular cavity 14 is arranged inside the upper cast aluminum rotor end ring 11; an exhaust hole 15 communicating with the upper annular cavity 14 is arranged at the top of the upper cast aluminum rotor end ring 11, which is used to exhaust the gas originally existing in the cast aluminum rotor end ring; The lower cast aluminum rotor end ring 12 is used for the casting connection and forming of the end ring on the other side of the aluminum bar rotor and the rotor slot-shaped guide bar; a lower annular cavity 16 is arranged inside the lower cast aluminum rotor end ring 12; a casting feed port 17 communicating with the lower annular cavity 16 is arranged at the bottom of the lower cast aluminum rotor end ring 12, which is used to inject molten aluminum liquid into the die cavity of the die.

[0026] The cast aluminum rotor iron core is placed in the die composed of the upper cast aluminum rotor end ring 11, the lower cast aluminum rotor end ring 12, and the middle cast aluminum rotor ring 13. The two ends of the rotor slot-shaped guide bar are respectively located in the upper annular cavity 14 and the lower annular cavity 16, and the upper end face and the lower end face of the cast aluminum rotor iron core are respectively in close contact with the lower end face of the upper cast aluminum rotor end ring 11 and the upper end face of the lower cast aluminum rotor end ring 12.

[0027] In this embodiment, the qualified rotor slot-shaped guide bars are placed into the rotor iron core slots, the lengths at both ends are calculated, the rotor iron core is placed into the template 1, the rotor slot-shaped guide bars at both ends respectively enter the inside of the upper annular cavity 14 and the lower annular cavity 16, and then casting is carried out to form. The two ends of the rotor slot-shaped guide bars are connected and fixed to the end rings at both ends.

[0028] The clamping slots 21 at both ends of the cast aluminum rotor slot-shaped guide bar 2 are designed to make the connection between the cast aluminum rotor end ring and the cast aluminum rotor guide bar more firm and prevent the cast aluminum rotor end ring from falling off.

[0029] The above is only a preferred embodiment of the present invention and is not used to limit the present invention. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the technical solution of the present invention.

Claims

1. A double-sided pressure casting process for an aluminum rotor, characterized in that: The steps include: S1: Pre-casting of cast aluminum rotor slot guide bars using a mold; S2: Detect the rotor slot bars; S3: placing the qualified rotor slot bars into the rotor core slots; S4: Aluminum row rotor casting: The cast aluminum rotor core is placed in a casting mold body composed of a cast aluminum rotor upper end ring, a cast aluminum rotor lower end ring and a cast aluminum rotor middle ring. The two ends of the rotor slot guide bar are respectively placed in the end ring cavities of the cast aluminum rotor upper end ring and the cast aluminum rotor lower end ring. The molten aluminum liquid is injected into the mold cavity of the casting mold body through the casting feed port. The gas originally existing in the cast aluminum rotor end ring is discharged through the casting exhaust port. The mold is cooled and formed.

2. The double-sided pressure casting process for an aluminum rotor according to claim 1, characterized in that: When casting the cast aluminum rotor slot-shaped guide bars in the step S1, guide bar clamping grooves are reserved at both ends of the rotor slot; the distance between the two guide bar clamping grooves on both sides is greater than the height of the rotor core.

3. The double-sided pressure casting process for an aluminum rotor according to claim 1 is characterized in that: The temperature of the molten aluminum in step S4 is 700°C-720°C.

4. The double-sided pressure casting process for an aluminum rotor according to claim 1, characterized in that: In the step S4, the solid aluminum remaining at the casting exhaust port is removed manually later.

5. The double-sided pressure casting process for an aluminum rotor according to claim 1, characterized in that: The end ring forming mold comprises a casting mold; the casting mold comprises a cast aluminum rotor upper end ring (11), a cast aluminum rotor lower end ring (12) and a cast aluminum rotor middle ring (13); The cast aluminum middle ring (13) is of a cylindrical structure and is located between the cast aluminum rotor upper end ring (11) and the cast aluminum rotor lower end ring (12), and the upper end and lower end of the cast aluminum middle ring (13) are tightly connected to the lower end surface of the cast aluminum rotor upper end ring (11) and the upper end surface of the cast aluminum rotor lower end ring (12) respectively; The cast aluminum rotor upper end ring (11) is used for forming an end ring on one side of an aluminum rotor and a rotor slot-shaped guide bar by casting; an upper end annular cavity (14) is arranged inside the cast aluminum rotor upper end ring (11); a gas outlet (15) communicating with the upper end annular cavity (14) is arranged at the top of the cast aluminum rotor upper end ring (11) for exhausting gas originally existing in the cast aluminum rotor end ring; The cast aluminum rotor lower end ring (12) is used for the end ring on the other side of the aluminum row rotor and the rotor groove guide bar to be cast and connected; a lower end annular cavity (16) is arranged in the cast aluminum rotor lower end ring (12); a casting feed port (17) connected to the lower end annular cavity (16) is arranged at the bottom of the cast aluminum rotor lower end ring (12) for injecting molten aluminum liquid into the mold cavity.

6. The double-sided pressure casting process for an aluminum rotor according to claim 5, characterized in that: A hole opened inside the middle ring of the aluminum rotor forms a casting guide tube.

7. The double-sided pressure casting process for an aluminum rotor according to claim 5, characterized in that: The cast aluminum rotor core is placed in a mold consisting of a cast aluminum rotor upper end ring (11), a cast aluminum rotor lower end ring (12), and a cast aluminum rotor middle ring (13); the two ends of the rotor slot-shaped guide bar are respectively located in the upper end annular cavity (14) and the lower end annular cavity (16); the upper end surface and the lower end surface of the cast aluminum rotor core are respectively in close contact with the lower end surface of the cast aluminum rotor upper end ring (11) and the upper end surface of the cast aluminum rotor lower end ring (12).

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