Aluminum row rotor single-face pressure casting process

Abstract

The invention discloses a single-face pressure casting technology for an aluminum row rotor. The technology comprises the following steps that S1, a mold is used for casting a cast-aluminum rotor groove type conducting bar 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 an end ring on one side of the cast-aluminum rotor: putting one end of the cast-aluminum rotor iron core into an end ring forming mold, putting the end part of the rotor groove type guide bar into an end ring cavity of the end ring forming mold, and injecting molten aluminum liquid into a mold cavity of the end ring forming mold through a casting feed port, gas originally existing in an end ring of the cast-aluminum rotor is exhausted through a casting exhaust port and is cooled and formed; and S5, casting and forming an end ring on the other side of the cast-aluminum rotor: overturning the cast-aluminum rotor iron core by 180 degrees, and casting the end ring on the other side of the cast-aluminum rotor according to the method in the step S3. 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 single-sided pressure casting process for an aluminum bar rotor. Background Art

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

[0003] Both the centrifugal cast aluminum and pressure cast aluminum processes are formed in one step during the cast aluminum 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 cast aluminum is completed, since the rotor core has been formed, if quality problems are found, the scrapping cost is too high. Therefore, using the method of first casting the rotor slot bars and then casting the end rings of the rotor core 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 single-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 solutions: A single-sided pressure casting process for an aluminum bar rotor, including 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 one side end ring of the cast aluminum rotor: Place one end of the cast aluminum rotor core into the end ring forming mold, place the ends of the rotor slot bars into the end ring cavities of the end ring forming mold, inject molten aluminum through the casting feed port into the mold cavity of the end ring forming mold, and discharge the gas originally existing in the cast aluminum rotor end ring through the casting exhaust port, and then cool and form. S5: Form the other side end ring of the cast aluminum rotor: Flip the cast aluminum rotor core by 180°, and according to the method of step S3, cast the other side end ring of the cast aluminum rotor.

[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, the temperature of the molten aluminum in step S4 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 template; a positioning cavity for the cast aluminum rotor core is provided on the upper end surface of the template; the outer periphery of the cast aluminum rotor core is in close fit with the side wall of the positioning cavity for the cast aluminum rotor core; an end ring cavity is provided below the positioning cavity for the cast aluminum rotor core; a casting feed port communicating with the end ring cavity is provided at the bottom of the template; and a casting exhaust port communicating with the end ring cavity is also provided on the template.

[0010] The beneficial effects of the present invention are as follows: The present invention adopts a method of pre-casting the cast aluminum rotor slot-shaped bars, then placing the qualified cast aluminum rotor slot-shaped bars into the rotor core slots, and then casting the end rings, which effectively controls the quality of the cast aluminum rotor core slot-shaped bars, reduces the quality problems of thin bars and broken bars in the centrifugal cast aluminum and pressure cast aluminum rotor cores, and improves the casting quality of the aluminum bar rotor.

[0011] The present invention provides guide bar slots at both ends of the cast aluminum rotor bars, making the connection between the cast aluminum rotor end ring and the cast aluminum rotor bars more firm and effectively preventing the cast aluminum rotor end ring from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the drawings and embodiments.

[0013] Figure 1 is a schematic structural diagram of the cast aluminum rotor bar of the present invention.

[0014] Figure 2 is Figure 1 the A-direction sectional view in

[0015] Figure 3 a schematic diagram of the single-sided casting die for the cast aluminum rotor.

[0016] Figure 4 is a schematic diagram of the planar relationship between the cast aluminum rotor end ring and the cast aluminum rotor bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions of the present invention will be clearly and completely described below through specific embodiments. Embodiment 1

[0018] An aluminum bar rotor single-sided pressure casting process in this embodiment includes the following steps: S1: Pre-cast the cast aluminum rotor slot-shaped bars using a die; S2: Detect the rotor slot-shaped bars; S3: Place the qualified rotor slot-shaped bars into the rotor core slots; S4: One - side end - ring casting of the cast - aluminum rotor: Place one end of the cast - aluminum rotor core into the end - ring forming die, and place the ends of the rotor - slot bars into the end - ring cavity of the end - ring forming die. Pour the molten aluminum liquid at a temperature of 700°C - 720°C into the die cavity of the end - ring forming die 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 is cooled and formed. The solid aluminum remaining at the casting exhaust port is removed manually later. S5: Casting and forming the other - side end - ring of the cast - aluminum rotor: Flip the cast - aluminum rotor core by 180°, and cast the other - side end - ring of the cast - aluminum rotor according to the method in step S3.

[0019] When casting the rotor - slot bars of the cast - aluminum rotor in step S1, leave guide - bar card slots 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.

[0020] In the present invention, by pre - casting the rotor - slot bars of the cast - aluminum rotor using a die, and then connecting the rotor - slot bars to the end - ring by casting only after they pass the inspection, putting the qualified rotor - slot bars of the cast - aluminum rotor into the rotor - core slots, and then casting the end - ring, the quality of the rotor - slot bars in the cast - aluminum rotor core can be effectively controlled, reducing the quality problems such as thin bars and broken bars that occur in the centrifugal - cast and pressure - cast rotor - core bars, and improving the casting quality of the aluminum - bar rotor.

[0021] The end - ring of the cast - aluminum rotor is formed on one side. Later, the cast - aluminum rotor core needs to be flipped by 180° and then the same method is used to cast the end - ring of the other end of the cast - aluminum rotor. Embodiment 2

[0022] As Figures 1-4 shown, when the aluminum - bar rotor is pressure - cast on one side, first connect one end of the rotor - core bar 2 to the end - ring 3 by casting to form a closed loop, and use the end - ring forming die for forming during use.

[0023] The end - ring forming die in this embodiment includes a template 1; on the upper surface of the template 1, there is a cast - aluminum rotor - core positioning cavity 11; the outer periphery of the cast - aluminum rotor core is in close contact with the side wall of the cast - aluminum rotor - core positioning cavity 11; below the cast - aluminum rotor - core positioning cavity 11, there is an end - ring cavity 12; at the bottom of the template 1, there is a casting feed port 13 communicating with the end - ring cavity 12; on the template 1, there is also a casting exhaust port 14 communicating with the end - ring cavity 12.

[0024] Put the rotor - slot bars that have passed the inspection into the rotor - core slots, calculate the lengths at both ends, put the rotor core into the rotor - core positioning cavity 11 of the template 1, and the rotor - slot bars then enter the interior of the end - ring cavity 12, and then pour and form, and the rotor - slot bars are connected and fixed to the end - ring.

[0025] The clamping grooves 21 at both ends of the cast aluminum rotor slot type conductor bar 2 are designed to connect the cast aluminum rotor end ring and the cast aluminum rotor conductor bar more firmly and prevent the cast aluminum rotor end ring from falling off.

[0026] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Those skilled in the art can make various modifications or equivalent replacements to the present invention 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 single-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: Casting of an end ring on one side of a cast aluminum rotor: placing one end of the cast aluminum rotor core into an end ring molding mold, placing the end of the rotor slot-shaped guide bar into the end ring mold cavity of the end ring molding mold, injecting molten aluminum into the mold cavity of the end ring molding mold through a casting feed port, and discharging the gas originally existing in the end ring of the cast aluminum rotor through a casting exhaust port, and cooling to form; S5: Casting the end ring on the other side of the cast aluminum rotor: Turn the cast aluminum rotor core 180 degrees, and cast the end ring of the cast aluminum rotor on the other side according to the method of step S3.

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

5. The single-sided pressure casting process for an aluminum rotor according to claim 1, characterized in that: The end ring forming mold comprises a template (1); the upper end surface of the template (1) is provided with a cast aluminum rotor core positioning cavity (11); the outer periphery of the cast aluminum rotor core is tightly fitted with the side wall of the cast aluminum rotor core positioning cavity (11); an end ring cavity (12) is provided below the cast aluminum rotor core positioning cavity (11); a casting feed port (13) communicating with the end ring cavity (12) is provided at the bottom of the template (1); and a casting exhaust port (14) communicating with the end ring cavity (12) is also provided on the template (1).

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