JPH07227067A - Squirrel-cage rotor manufacturing device - Google Patents

Abstract

PURPOSE:To provide a squirrel-cage rotor manufacturing device whereby a squirrel-cage rotor can be manufactured without producing burrs on a peripheral surface of a rotor core and without generating deformation or the like of the rotor core. CONSTITUTION:A first metal mold 8 having a groove 10 for forming a short- circuit ring in one end face and a second metal mold 11 having a groove 12 for forming a short-circuit ring in the other end face, in the axial direction of a rotor core 6, are pressed, and also by injecting aluminum 15 from an aluminum injection path 14 provided in this second metal mold 11, a slot bar and the short-circuit ring are formed. In the case of applying aluminum die-cast, by holding the rotor core 6 fitted to a core insert die 17 and also by holding the core insert die 17 to a pair of moving metal molds 16a, 16b movably arranged so as to be pressed from both sides to the periphery of the rotor core 6, the moving metal molds 16a, 16b, without applying large force, can hold the rotor core 6 through the core insert die 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squirrel cage rotor manufacturing apparatus for manufacturing a squirrel cage rotor by subjecting a rotor core having open slots to aluminum die casting, and more particularly to a die for the same.

[0002]

2. Description of the Related Art In a conventional compressor motor, a rotor core is formed by laminating a large number of disk-shaped magnetic steel plates having a shaft hole at the center and slots (grooves) at the outer periphery, and an aluminum die-cast in the slot. Some have a squirrel-cage rotor having a slot bar formed by application and a short-circuit ring on both sides for short-circuiting the slot bar.

As a rotor core of such a squirrel-cage rotor, there is a rotor core having a large number of closed slots 2 in its outer peripheral portion, the openings of which are closed by ribs 1 as shown in FIG. In the figure, 3 is a rotor core, and 4 is an axial hole formed in the center of the rotor core 3 for inserting a shaft (not shown).

By the way, in a cage rotor formed by die-casting aluminum into a rotor core having such a closed slot, aluminum does not leak from the slot to the outer peripheral surface of the rotor core at the time of manufacture. Ribs may be present between the motor and the stator, so that torque slack may occur, or eddy currents generated between slots may travel along the ribs and flow around the outer periphery, causing magnetic noise.

Therefore, in the conventional electric motor, a squirrel-cage rotor having a rotor core 6 having an open slot 5 as shown in FIG. 4 is used in order to improve efficiency and suppress the generation of noise. The rotor having such a rotor core is pressed against one end surface of the rotor core in the axial direction and is pressed against the other end surface of the rotor core in the axial direction with the first mold having a groove forming a short-circuit ring. Manufacture comprising a second mold having an aluminum injection path for die casting while having a groove forming a short circuit ring, and a pair of movable molds arranged so as to press against the outer periphery of the rotor core from both sides. It is manufactured by the device. A rotor having a closed slot is also manufactured by the same manufacturing apparatus.

[0006]

However, in such a conventional cage rotor manufacturing apparatus, a gap is created between the rotor core and the pair of movable molds when the cage rotor is manufactured. When aluminum die casting is applied to the open slot so as to manufacture a cage rotor having the above-mentioned structure, aluminum leaks from the opening of the open slot due to this gap, and burrs are generated on the outer peripheral surface of the rotor core.

If burrs are thus generated on the outer peripheral surface of the rotor core, the rotational balance of the rotor may be deteriorated, or the burrs may collide with the stator when the rotor rotates and the stator or the like may be damaged. There is. For this reason, conventionally, after the rotor was manufactured, the burr cutting work was performed.
This cutting work has a problem that it takes time and labor.

It is possible to press the moving mold onto the rotor core so as not to cause burrs, and to bring the rotor core and the moving mold into close contact. However, when the moving mold is pressed against the rotor core in this way In some cases, a large force may be applied to the rotor core and the rotor core may be deformed.
In addition, after performing the aluminum die casting, a large force is required when the moving die that is in close contact with the rotor core is released from the rotor core, and the rotor core may be deformed when the moving die is removed. There will be other problems that will occur.

Therefore, the present invention has been made in order to solve such a problem, and is a cage rotor manufacturing apparatus capable of manufacturing a cage rotor without causing burrs on the outer peripheral surface of the rotor core. It is intended to provide. It is another object of the present invention to provide a cage rotor manufacturing apparatus capable of manufacturing a cage rotor without causing deformation of the rotor core.

[0010]

DISCLOSURE OF THE INVENTION According to the present invention, there is provided a rotor core formed by laminating a large number of disk-shaped magnetic steel plates each having an axial hole in a central portion and an open slot in an outer peripheral portion, and an aluminum die casting in the open slot. In a cage rotor manufacturing apparatus for manufacturing a cage rotor including a slot bar formed by and a short-circuit ring on both sides for short-circuiting the slot bar, while pressing against one axial end surface of the rotor core, A first mold having a groove forming the short-circuit ring,
A second mold having an aluminum injection passage for die casting while having a groove for pressing the other end surface of the rotor core in the axial direction and forming the short-circuit ring, and an arrangement for pressing the outer periphery of the rotor core from both sides. A pair of movable molds that are movable, and a core insert die that fits and holds the rotor core in close contact with the outer peripheral surface of the rotor core,
The pair of movable molds are configured to hold the rotor core through the core insert mold.

[0011]

A groove for forming a short-circuit ring for short-circuiting the slot bar on one axial end face of a rotor core formed by laminating a large number of disk-shaped magnetic steel plates each having an axial hole in the central portion and an open slot in the outer peripheral portion. And a second mold having a groove for forming a short-circuit ring on the other end surface thereof, and aluminum is injected from an aluminum injection path for die casting provided in the second mold. By injecting, a slot bar and short-circuit rings on both sides of this slot bar can be formed.

When the aluminum die casting is performed, the rotor core is fitted and held so that the outer peripheral surface of the rotor core is in close contact with the core insert die, and a pair of movable pair arranged so as to press against the outer periphery of the rotor core from both sides. Since the movable die holds this core insert die, the movable die can hold the rotor core through the core insert die without applying a large force.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a squirrel cage rotor manufacturing apparatus according to an embodiment of the present invention. In FIG.
The same reference numerals denote the same or corresponding parts.

In FIG. 1, 7 is a squirrel-cage rotor manufacturing apparatus, and 8 is a first metal having a groove 10 which presses against one axial end surface of a rotor core 6 having an open slot and which forms a short-circuit ring. A mold 11 is a second mold having a groove 12 that presses against the other end surface of the rotor core 6 in the axial direction and forms a short-circuit ring, while having an aluminum injection passage 14 for die casting. Reference numeral 15 is aluminum for die casting.

Further, 16a and 16b are arranged so as to be pressed against the outer periphery of the rotor core 6 from both sides, for example, a pair of movable molds which can move in the vertical direction as shown by the arrow in FIG. It is a core insert type that is formed into a cylindrical shape as shown in (3) and that is fitted tightly to the outer peripheral surface of the rotor core 6 to hold the rotor core 6. In addition, 7a is a fixed wall of the squirrel cage rotor manufacturing apparatus 7, and movable dies 16a and 16b.
Moves vertically in a space S formed between the fixed wall 7a and the second mold 11.

Then, after the rotor core 6 is fitted and held in the core insert mold 17 in this way, aluminum 15 is injected from the aluminum injection passage 14 so that the core insert mold 17 is in close contact with the outer peripheral surface of the rotor core 6. Therefore, the aluminum 15 does not leak from the opening 5a of the open slot 5. Therefore, even if aluminum die casting is performed, burrs do not occur on the outer peripheral surface of the rotor core 6.

The core insert mold 17 is held by the movable molds 16a and 16b so as not to move in the vertical direction as shown in FIG. 16a and 16b can hold the rotor core 6 via a core insert die 17.

By holding the rotor core 6 via the core insert die 17 in this way, the movable dies 16a and 16b do not directly contact the rotor core 6. Therefore, when the aluminum die casting is performed, a large force is not applied to the rotor core 6, and after the aluminum die casting is performed, the rotor core 6 is affected even if the moving dies 16a and 16b move in the detaching direction. Moreover, the rotor core 6 is prevented from being deformed.

After manufacturing the cage rotor by aluminum die casting in this manner, for example, the core insert die 17 is removed and the rotor core 6 is tapped lightly.
The cage rotor can be taken out from the core insert die 17.

When manufacturing a squirrel-cage rotor with the squirrel-cage rotor manufacturing apparatus thus constructed, first, the rotor core 6 is fitted and held in the core insert mold 17 (see FIG. 2), and then, The first mold 8 is pressed against one axial end surface of the rotor core 6 fitted and held in the core insert mold 17, and then the second mold 11 is pressed against the other axial end surface of the rotor core 6. .

Finally, the movable molds 16a and 16b are moved vertically in the space S formed between the fixed wall 7a and the second mold 11 to hold the core insert mold 17. Then, from the aluminum injection path 14 of the second mold 11, aluminum 1
When 5 is injected, the aluminum 15 will move into the groove 10 of the first mold 8,
The open slot 5 and the groove 12 of the second mold 11 are sequentially filled, and the slot bar and the short-circuit rings on both sides are formed in the rotor core 6. At this time, since the core insert mold 17 is in close contact with the outer peripheral surface of the rotor core 6, the aluminum 15 does not leak from the opening 5a of the open slot 5 and burrs do not occur.

Thus, when aluminum die casting is performed,
By inserting and holding the rotor core 6 in the core insert mold 17, it is possible to prevent burrs from being generated on the outer peripheral surface of the rotor core 6. Further, since the movable molds 16a and 16b hold the rotor core 6 via the core insert mold 17, the movable molds 16a and 16b after the aluminum die casting is finished.
It is possible to prevent deformation of the rotor core 6 when the 16b is removed.

[0024]

As described above, according to the present invention, it is possible to prevent burrs from being formed on the outer peripheral surface of the rotor core when aluminum die casting is performed by inserting and holding the rotor core in the core insert type. . In addition, since the moving die holds the rotor core through the core insert die,
It is possible to prevent the rotor core from being deformed when the aluminum die is cast and when the movable die is detached.

[Brief description of drawings]

FIG. 1 is a side sectional view of a squirrel cage rotor manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a rotor core is fitted and held in a core insert die of the basket type rotor manufacturing apparatus.

FIG. 3 is a side view of a conventional rotor core having a closed slot.

FIG. 4 is a side view of a conventional rotor core having an open slot.

[Explanation of symbols]

 3,6 Rotor core 5 Open slot 7 Cage type rotor manufacturing device 8 First mold 11 Second mold 16a, 16b Moving mold 17 Core insert mold

Claims (1)

[Claims] 1. A rotor core formed by laminating a large number of disk-shaped magnetic steel plates each having an axial hole in a central portion and an open slot in an outer peripheral portion, a slot bar formed by die-casting aluminum in the open slot, and In a squirrel cage rotor manufacturing apparatus for manufacturing a squirrel-cage rotor having short-circuit rings on both sides for short-circuiting the slot bar, while pressing against one axial end surface of the rotor core, a groove forming the short-circuit ring is formed. A first mold having the first mold and a second mold having an aluminum injection path for die casting, while having a groove that presses against the other axial end surface of the rotor core and forms the short-circuit ring; A core insert that includes a pair of movable molds that are arranged so as to press against the outer periphery from both sides, and that fits and holds the rotor core in close contact with the outer peripheral surface of the rotor core. The a, the pair of movable die cage rotor manufacturing apparatus is characterized in that so as to hold the rotor core through the core insert mold.