JP2011156585A - Device and method for manufacturing laminated iron core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for manufacturing a laminated iron core, capable of executing rotational buildup at a speed higher than a conventional way, and contributing to cost reduction of a product. <P>SOLUTION: There are provided the device and method for manufacturing the laminated iron core. The device includes a die 18 disposed oppositely to a punch 12, a squeeze ring 19 provided immediately below the die 18 and holding a core piece 11 punched with the punch 12 and the die 18, a die holder 20 for holding them, and a motor 21 having a stator 30 and a rotor 31 and driving the die holder 20 so as to rotate. The die holder 20 is provided coaxially with the rotor 31, and the die 18, the squeeze ring 19 and the die holder 20 are directly driven by the motor 21 to carry out alternately building up or skewing of the core piece 11 punched in the die 18 by the punch 12 and the die 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an apparatus and a method for manufacturing a laminated core formed by rotating and laminating (so-called rolling) iron core pieces punched from a plate-like material.

Conventionally, in the production of a laminated iron core, in order to avoid problems of thickness deviation of the core piece and magnetic anisotropy, transposition has been performed. As shown in FIG. 4, this roll-over is performed by a roll-over unit 81 including a laminated unit 82 and a drive motor 83. That is, the rotational force of the drive motor 83 is transmitted to the speed reducer 86 a and the pulley 86 b and is transmitted to the pulley 88 via the timing belt 87. The rotational force transmitted to the pulley 88 is further transmitted to the die holder 85 of the laminated unit 82, and the core piece rotates and rolls together with the die 84a and the squeeze ring 84b held by the die holder 85 (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2003-19520

However, the timing belt driving method has the following problems.
1) When the rolling speed is increased for the purpose of improving productivity, the timing belt is damaged. In other words, the timing belt has upper limits on mechanical strength and torque transmission capacity, and therefore there is an upper limit on the rolling speed. Here, simply increasing the size of the timing belt increases the size of the mold. Furthermore, even the press becomes large or out of specification, which increases costs.
2) In the case of a large laminated iron core, the moment of inertia is large, so the timing belt expands and contracts, and the positioning settling time is increased accordingly. Further, it is necessary to adjust the press operation stop and restart timing and the punch stroke speed in accordance with the settling time.
3) It takes time to attach and detach the drive motor and pulley when changing the mold, leading to an increase in cost.
4) In order to prioritize productivity improvement and cost reduction, the number of transpositions should be reduced, but the quality of the laminated iron core will deteriorate. Conversely, in order to prioritize quality, the number of inversions may be increased, but this causes problems such as a decrease in productivity and an increase in cost. In other words, the number of inversions and the quality of the laminated core are in a contradictory relationship, and there is a situation that the laminated core is produced in a place where both are balanced. Therefore, there is a demand to increase the rolling speed and balance the number of rolling times and the quality of the laminated core at a higher level.

This invention is made | formed in view of this situation, and sets it as the 1st objective to provide the manufacturing apparatus and manufacturing method of a laminated iron core which can perform transposition at higher speed than before. It is a second object of the present invention to provide an apparatus and a method for manufacturing a laminated core that contributes to a reduction in product cost as compared with the prior art.

An apparatus for manufacturing a laminated core according to the first invention that meets the above-mentioned object is a laminated iron core comprising: a die arranged opposite to a punch; a stator having a stator and a rotor; and a motor that rotationally drives the die. Manufacturing equipment,
The die is provided coaxially with the rotor, and the die is directly driven by the motor.

An apparatus for manufacturing a laminated core according to a second aspect of the present invention for holding the object holds a die disposed opposite to a punch, and an iron core piece formed by punching with the punch and the die immediately below the die. A laminated iron core manufacturing apparatus comprising a squeeze ring, a stator and a rotor, the die and a motor that rotationally drives the squeeze ring,
The die and the squeeze ring are provided coaxially with the rotor, and the die and the squeeze ring are directly driven by the motor.

An apparatus for manufacturing a laminated core according to a third aspect of the present invention, which meets the above-mentioned object, holds a die disposed opposite to a punch, and an iron core piece punched and formed by the punch and the die immediately below the die. A laminated iron core manufacturing apparatus comprising a squeeze ring, a die holder that supports them, a stator and a rotor, and a motor that rotationally drives the die holder,
The die holder is provided coaxially with the rotor, and the die, the squeeze ring, and the die holder are directly driven by the motor.

In the laminated core manufacturing apparatus according to a third aspect of the invention, the die holder can be rotatably supported on the lower mold via a radial bearing and a thrust bearing.

In the laminated core manufacturing apparatus according to a third aspect of the invention, the stator can be fixedly arranged on the lower mold.

In the laminated core manufacturing apparatus according to the third aspect of the present invention, it is preferable that a positioning mechanism is provided on the die holder.

In the laminated core manufacturing apparatus according to a third aspect of the present invention, the positioning mechanism includes a positioning hole provided at a predetermined angular position of the die holder, a pin provided in the lower mold and fitable in the positioning hole, and the pin It is good to have advancing / retreating means.

A method for manufacturing a laminated core according to a fourth aspect of the present invention that meets the above-described object includes a die that is disposed to face a punch, a stator and a rotor, and a motor that rotationally drives the die.
The die is provided coaxially with the rotor, and the die is directly driven by the motor to roll or skew the core pieces that have been dropped into the die by the punch and the die.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a laminated iron core, comprising: a die disposed opposite to a punch; and an iron core piece punched and formed by the punch and the die immediately below the die. A squeeze ring, having a stator and a rotor, and having a motor that rotationally drives the die and the squeeze ring;
The die and the squeeze ring are provided coaxially with the rotor, and the die and the squeeze ring are directly driven by the motor, and the iron core pieces rolled out into the die by the punch and the die are rolled. Alternatively, skew is performed.

A method of manufacturing a laminated core according to a sixth aspect of the present invention that meets the above-described object is to hold a die disposed opposite to a punch, and an iron core piece formed by punching with the punch and the die immediately below the die. A squeeze ring, a die holder that supports them, a stator and a rotor, and a motor that rotationally drives the die holder,
The die holder is provided coaxially with the rotor, and the die, the squeeze ring, and the die holder are directly driven by the motor, and the core piece that has been pulled into the die by the punch and the die is rolled. Perform product or skew.

In the laminated core manufacturing apparatus and manufacturing method according to the present invention, since the die is driven to rotate by the motor, it is possible to increase the rolling speed compared to the conventional technique. Further, since the maintainability is improved, the product cost can be reduced as compared with the conventional case.

Further, in the laminated iron core manufacturing apparatus according to the present invention, when the positioning mechanism is provided, the die holder can be stopped more accurately at a predetermined angle than in the past.

It is sectional drawing of the manufacturing apparatus of the laminated iron core which concerns on the 1st Embodiment of this invention. It is XX sectional drawing of FIG. It is sectional drawing of the manufacturing apparatus of the laminated iron core which concerns on the 2nd Embodiment of this invention. It is a schematic diagram of the conventional transshipment unit.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, the laminated core manufacturing apparatus according to the first embodiment of the present invention includes a punch 12 for advancing and retreating in the vertical direction and punching the core piece 11 from the steel plate 10, and a lower mold 13. Is mounted opposite to the punch 12 and disposed opposite to the punch 12, and the iron core piece 11 (laminated core 15) provided below the roll unit 14 and rolled by the roll unit 14 is placed thereon. And a mounting table 16 that moves up and down.
The mounting table 16 is supported by a support body 40 provided at the lower portion, and the mounting table 16 and the support body 40 are configured to be rotatable. Further, the lower mold 13 is provided to face an upper mold (not shown) provided with the punch 12, and a mold for performing press working with the lower mold 13 and the upper mold is configured.

The rolling unit 14 includes a die 18, a squeeze ring 19, a die holder 20, and a hollow motor (an example of a motor) 21 having a stator 30 and a rotor 31. The die 18, the squeeze ring 19, and the die holder 20 constitute a stacked unit 17.

The die 18 is provided facing the lower side of the punch 12. When the punch 12 enters the die 18, the core piece 11 is punched from the steel plate 10.
The squeeze ring 19 is a cylindrical member that is provided on the lower side (directly below) of the die 18 and holds the core piece 11 by applying a side pressure to the side surface of the core piece 11 punched out by the die 18 and the punch 12. The core pieces 11 are sequentially stacked while being held by a squeeze ring 19.

The die holder 20 is a hollow member for fixing the die 18 and the squeeze ring 19 to the inside thereof. The hollow portion is not closed at both ends in the height direction and is open.
The die holder 20 is provided coaxially with the rotor 31. Specifically, as shown in FIGS. 1 and 2, the die holder 20 includes a cylindrical upper portion 22 that is fixed in a state of being mounted on an end plate 36 that is formed in a flange shape and closes the end of the rotor 31. A cylindrical middle portion 23 inserted into the hollow portion of the rotor 31 of the hollow motor 21 and a cylindrical lower portion 25 extending to the lower side of the rotor 31 are configured.
The middle part 23 is formed to have an outer diameter larger than that of the lower part 25, and the middle part 23 is supported by an oilless bush 28 provided in the lower mold 13.
The lower portion 25 is provided with a bearing, and the die holder 20 is supported to be rotatable with respect to the lower mold 13. Specifically, a groove 29 is formed on the outer peripheral surface of the lower portion 25 in the circumferential direction. The inner ring of the radial bearing 26 is in contact with the upper corner of the groove 29, and the inner ring of the thrust bearing 27 is in contact with the lower corner. The outer rings of these bearings are in contact with the lower mold 13.

The stator 30 of the hollow motor 21 is formed by accommodating a coil 33 wound around an iron core in a motor housing 32 fixed to the lower mold 13. Since the rotor 31 of the hollow motor 21 rotates, the upper portion of the motor housing 32 is in contact with the upper portion of the die holder 20 via a gap, and the gap is sealed with a seal member 35. The seal member 35 is, for example, an oil seal (contact type) or a labyrinth seal (non-contact type). By providing this seal member 35, foreign matter intrusion into the hollow motor 21 is prevented.
The rotor 31 is rotatably provided inside the stator 30 and has a hollow portion formed around the rotation shaft. Both ends of the hollow portion are not closed and are open. As described above, the die holder 20 is fixed to the rotor 31 so as to penetrate the hollow portion.
The rotor 31 is rotated by receiving electromagnetic force from the stator 30 fixed to the lower mold 13, but rotates through the radial bearing 26, the thrust bearing 27, and the oilless bush 28.
The type of the hollow motor 21 is a servo motor, and a rotary encoder (not shown) is mounted.

The die holder 20 is rotatably supported by the radial bearing 26 and the thrust bearing 27. Alternatively, the rotor 31 may be rotatably supported by the bearing.
The hollow motor is not limited to a servo motor, and may be a pulse motor.
Further, a hollow speed reducer may be provided on the output shaft of the hollow motor 21, and the die holder 20 may be rotated via the hollow speed reducer.
Furthermore, the laminated iron core manufacturing apparatus according to the present embodiment can be used not only for the roll-over of iron core pieces but also for forming a skew in the laminated iron core. Further, the divided core pieces may be rolled up, and the fan-shaped divided core pieces can be laminated in a brick shape.

Next, the manufacturing method of the laminated iron core using the laminated iron core manufacturing apparatus according to the first embodiment will be described.
First, a predetermined pressing process is performed on the steel sheet 10 in the previous step, and the pressed steel sheet 10 is conveyed onto the die 18 (step S1).
Next, the steel plate 10 is punched by the punch 12 and the die 18 to form the iron core piece 11, and the iron core piece 11 is pushed into the entrance of the squeeze ring 19 by the punch 12 (step S2). When being pushed, the lower end surface of the laminated core 15 (the core piece 11 punched and laminated first) is supported by the mounting table 16, and the pushed iron piece 11 is held first by the squeeze ring 19. The piece 11 is caulked and joined.
Next, the rotor 31 of the hollow motor 21 is rotated, and the iron core piece 11 is rotated around the rotation center axis of the rotor 31 by a predetermined angle (step S3). That is, the hollow motor 21 rotates the iron core piece 11 held in the squeeze ring 19 together with the die holder 20 fixed to the rotor 31 by a predetermined angle.

The operations described above (steps S1 to S3) are repeated, and the core pieces 11 are sequentially rolled.
When all the iron core pieces 11 are rolled and the laminated iron core 15 is formed, the formed laminated iron core 15 is placed on the mounting table 16 and lowered. Then, the laminated core 15 is conveyed outside the mold.
In addition, in the manufacturing method of the laminated core which concerns on this Embodiment, all the iron core pieces 11 were rolled up, However, The laminated iron core may be formed by rolling up the iron block which laminated | stacked several core pieces.

Subsequently, a laminated core manufacturing apparatus according to a second embodiment of the present invention will be described.
In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
FIG. 3 is a cross-sectional view of the laminated core manufacturing apparatus according to the second embodiment of the present invention.
The type of the hollow motor 21 is different from the manufacturing apparatus according to the first embodiment, and is not a servo motor but a pulse motor. The die holder 20 is provided with a positioning mechanism for positioning the die holder 20 at a predetermined angle. The positioning mechanism includes a positioning hole 52 provided on the outer peripheral surface of the lower end portion 53 of the die holder 20 at a predetermined angular position, a pin 50 that can be fitted into the positioning hole 52, and the pin 50 can be advanced and retracted in the axial direction. And a driving device (an example of advancing / retreating means) 51 for driving. The positioning hole 52 is provided at a position where the die holder 20 is positioned when the iron core piece 11 is rolled. The driving device 51 is fixed to the lower mold 13.

Next, a method for manufacturing a laminated core using the laminated core manufacturing apparatus according to the second embodiment will be described.
First, a predetermined pressing process is performed on the steel sheet 10 in the previous step, and the pressed steel sheet 10 is conveyed onto the die 18 (step S1).
Next, the steel plate 10 is punched by the punch 12 and the die 18 to form the iron core piece 11, and the iron core piece 11 is pushed into the entrance of the squeeze ring 19 by the punch 12 (step S2). When pushed in, the lower end surface of the laminated core 15 is supported by the mounting table 16, and the core piece 11 is caulked and joined to the core piece 11 previously held by the squeeze ring 19.
Next, the pin 50 is pulled in by the drive device 51 (step S3).
Next, the rotor 31 of the hollow motor 21 (pulse motor) is rotated at a predetermined angle. That is, together with the die holder 20 fixed to the rotor 31, the iron core piece 11 held in the squeeze ring 19 is rotated by a predetermined angle (step S4).
Next, the pin 50 is advanced by the driving device 51 and is inserted into the positioning hole 52 (step S5). By inserting the pin 50 into the positioning hole 52, the iron core piece 11 is reliably positioned.

The operations described above (steps S1 to S5) are repeated, and the iron core pieces 11 are sequentially rolled.
When all the iron core pieces 11 are rolled and the laminated iron core 15 is formed, the formed laminated iron core 15 is lowered while being placed on the mounting table 16. Then, the laminated core 15 is conveyed outside the mold.

In this embodiment, in order to prevent step-out, a separate rotary encoder may be provided and the pulse motor may be driven by closed loop control. The motor that rotates the iron core piece 11 may be a servo motor instead of a pulse motor.
Further, since positioning is finally performed by the pin 50, the type of the hollow motor may be any positioning motor regardless of the positioning accuracy.
Further, a hollow speed reducer may be provided on the output shaft of the hollow motor 21, and the die holder 20 may be rotated via the hollow speed reducer.
Furthermore, the laminated iron core manufacturing apparatus according to the present embodiment can be used not only for the roll-over of iron core pieces but also for forming a skew in the laminated iron core. Further, the divided core pieces may be rolled up, and the fan-shaped divided core pieces can be laminated in a brick shape.

As described above, according to the first and second embodiments of the present invention, 1) Since the hollow motor 21 rotates the core piece 11 by directly driving the laminated unit 17, it has existed conventionally. The restrictions on the mechanical strength and torque transmission capacity of the belt are eliminated, and the speed required for rolling can be improved. 2) Since the frequency of restarting and stopping the press is lower than before, press wear is suppressed. 3) Since the roll-over unit is provided integrally with the mold, the trouble of attaching and detaching the motor and pulley as in the prior art becomes unnecessary, and the maintainability is improved. 4) Since the mold can be made smaller than before, peripheral equipment and workers are unnecessary. As a result, maintainability is improved and the cost of the product can be reduced. 5) Since the transfer rate is increased, productivity and product quality can be improved, and the cost of the product can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications can be made without changing the gist of the present invention. For example, the case where the laminated iron core manufacturing apparatus and manufacturing method of the present invention are configured by combining some or all of the above-described embodiments and modifications is also included in the technical scope of the present invention.

10: Steel plate, 11: Iron core piece, 12: Punch, 13: Lower die, 14: Rolling unit, 15: Laminated iron core, 16: Mounting table, 17: Laminated unit, 18: Die, 19: Squeeze ring, 20: Die holder, 21: hollow motor, 22: upper part, 23: middle part, 25: lower part, 26: radial bearing, 27: thrust bearing, 28: oil-free bush, 29: groove, 30: stator, 31: rotor, 32: Motor housing, 33: Coil, 35: Seal member, 36: End plate, 40: Support, 50: Pin, 51: Drive device, 52: Positioning hole, 53: Lower end

Claims (10)

A laminated iron core manufacturing apparatus comprising a die disposed opposite to a punch, a stator and a rotor, and a motor that rotationally drives the die,
An apparatus for producing a laminated core, wherein the die is provided coaxially with the rotor, and the die is directly driven by the motor. A die disposed opposite to the punch, a squeeze ring that is directly below the die and holds the punch and the core piece punched and formed by the die, a stator and a rotor, the die and the A laminated iron core manufacturing apparatus comprising a motor that rotationally drives a squeeze ring,
The die and the squeeze ring are provided coaxially with the rotor, and the die and the squeeze ring are directly driven by the motor. A die disposed opposite to the punch; a squeeze ring that is directly below the die and holds the punch and the core piece punched and formed by the die; a die holder that supports them; a stator and a rotor A laminated iron core manufacturing apparatus comprising a motor that rotationally drives the die holder,
The die core is provided coaxially with the rotor, and the die, the squeeze ring and the die holder are directly driven by the motor. 4. The laminated core manufacturing apparatus according to claim 3, wherein the die holder is rotatably supported by a lower mold via a radial bearing and a thrust bearing. 5. The laminated core manufacturing apparatus according to claim 4, wherein the stator is fixedly disposed on the lower mold. The laminated core manufacturing apparatus according to any one of claims 3 to 5, wherein the die holder is provided with a positioning mechanism. 7. The laminated core manufacturing apparatus according to claim 6, wherein the positioning mechanism includes a positioning hole provided at a predetermined angular position of the die holder, a pin provided in the lower mold and fitable in the positioning hole, An apparatus for manufacturing a laminated iron core, characterized by comprising advancement / retraction means. A die disposed opposite to the punch, a stator and a rotor, and a motor for rotationally driving the die;
The die is provided coaxially with the rotor, and the die is directly driven by the motor to roll or skew the core pieces that have been dropped into the die by the punch and the die. Manufacturing method of laminated iron core. A die disposed opposite to the punch, a squeeze ring that is directly below the die and holds the punch and the core piece punched and formed by the die, a stator and a rotor, the die and the A motor for rotationally driving the squeeze ring,
The die and the squeeze ring are provided coaxially with the rotor, and the die and the squeeze ring are directly driven by the motor, and the iron core pieces rolled out into the die by the punch and the die are rolled. Or the manufacturing method of the laminated iron core characterized by performing skewing. A die disposed opposite to the punch; a squeeze ring that is directly below the die and holds the punch and the core piece punched and formed by the die; a die holder that supports them; a stator and a rotor And a motor that rotationally drives the die holder,
The die holder is provided coaxially with the rotor, and the die, the squeeze ring, and the die holder are directly driven by the motor, and the core piece that has been pulled into the die by the punch and the die is rolled. A method of manufacturing a laminated iron core, wherein product or skew is performed.

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