JPH06225502A - Method and apparatus for manufacture of iron core - Google Patents

Abstract

PURPOSE:To provide the manufacturing method, of an iron core, wherein it can enhance the concentricity of the inside diameter and the outside diameter of an iron-core piece stamped inside a die, it can prevent a disk-shaped buckling phenomenon from being caused in the iron-core piece and it can increase the caulking force of laminated iron-core pieces and to provide its manufacturing apparatus. CONSTITUTION:The title apparatus is provided with a punch 11 in which a positioning hole 11a has been formed on the rear surface and which stamps a stripe material 15 having central holes 13 and caulking parts formed at a prescribed pitch, with a die 12 which forms a pair together with the punch 11 and with an upper-end part which is housed inside the die 12 and which can be inserted into the positioning hole 11a when iron-core pieces 16 are stamped. In addition, the title apparatus is provided with a force-fitting bar 21 wherein an outer-fitting part 22 which is installed in a part faced with at least the upper part of the die 12 and whose diameter is a little larger than that of the central holes 13 in the stripe material 15 and a small-diameter part 23 which is arranged at the lower part than the outer-fitting part 22 and whose diameter is smaller than that of the central holes 13, with a receiver member 25 which is installed so as to be detachable with reference to the force-fitting bar 21 and which supports the force-fitting bar 21 and with a drive means 26 which attaches and detaches the receiver member 25 to and from the force-fitting bar 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an iron core and an apparatus for manufacturing the same, and more particularly, to a method of manufacturing an iron core having flatness by preventing concentricity of inner and outer diameters and dish-shaped waist bending. The manufacturing apparatus is related.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing an iron core used in an electric motor, for example, a strip material in which center holes of an iron core piece having caulking portions around it are perforated at regular intervals is sent to a mold, and the center hole is centered. The core pieces are sequentially drawn into the die, and the core pieces that have been pulled out are stacked by fitting the caulking parts together due to the frictional resistance of the outer peripheral surface of the core piece and the inner peripheral surface of the die and the drop pressure of the punch. A lateral pressure caulking method is known. In addition to the side pressure crimping manufacturing method, an elevation table is provided in the die for lowering the punch downward pressure by the thickness of one iron core piece each time the iron core piece is punched out. A back pressure caulking method is known in which the caulking pressure between the caulking portions of the laminated iron core pieces is obtained by the back pressure. In addition, the positioning of the strip material when punching out the iron core piece,
This is performed by positioning holes formed at both ends in the width direction of the strip at a constant pitch, and positioning pins provided on the mold side and inserted into the positioning holes.

[0003]

However, in the side pressure caulking method and the back pressure caulking method, residual stress in the bar material is released when the predetermined shape of the core piece is formed by press working. The pitch between the positioning holes formed on the core changes and a slight misalignment occurs between the positioning hole and the center hole. There was a problem that the concentricity of the was reduced. Further, when the iron core piece is pulled out into the die, a warp occurs in the iron core piece, and due to the frictional resistance between the warp and the outer peripheral surface of the iron core piece and the inner peripheral surface of the die, and the downward pressure of the punch, the iron core piece is There was a problem that a dish-like waist fold was generated at the outer edge portion of and the adhesion in the subsequent process was deteriorated. The present invention has been made in view of such circumstances, it is possible to improve the concentricity of the inner and outer diameters of the core piece withdrawn into the die, it is possible to prevent the dish-shaped waist bending phenomenon that occurs in the core piece, and to be laminated An object of the present invention is to provide a method of manufacturing an iron core and an apparatus for manufacturing the same, which can increase the crimping force between the iron core pieces.

[0004]

A method according to the above-mentioned object.
The manufacturing method of the iron core described, from the strip material in which the protruding caulking portion and the central hole are formed in advance, punching the iron core piece with a punch and a die, the punched iron core piece, in the die, sequentially, In the method of manufacturing an iron core, in which the crimped portions are stacked while being fitted to each other to manufacture the iron core, and then the manufactured iron core is carried out, in the die, the iron core piece is formed on the lower surface of the punch at the time of punching. An outer fitting portion that has an upper end portion that can be inserted into the positioning hole and that is slightly larger in diameter than the central hole of the strip provided at a location facing at least the upper portion of the die, and that is arranged below the outer fitting portion. The press-fitting bar of the iron core piece having a smaller diameter portion smaller than the center hole is accommodated, and the press-fitting bar is detachably provided to the press-fitting bar by a driving means to support the press-fitting bar. Receiving member When the core piece is punched out, the core piece is punched while supporting the press-fitting bar by the receiving member, the punched-out core pieces are sequentially inserted into the press-fitting bar, and the die and While being supported by the frictional resistance of the outer fitting portion of the press-fitting bar, the crimping portion of the lower core piece is successively fitted with the crimping portion of the upper core piece, and the predetermined number of the core pieces are formed. The core is manufactured.

The iron core manufacturing apparatus according to claim 2 is
A punch for punching out a bar material having a positioning hole formed on the lower surface and having a central hole and a protruding caulking portion at a predetermined pitch, a die paired with the punch, and a punch housed in the die for punching. Has an upper end portion that can be inserted into the positioning hole of the punch when punching the iron core piece punched by, and has an outer diameter slightly larger than the central hole of the strip provided at a position facing at least the upper portion of the die. Fitting part,
A press-fitting bar of the iron core piece provided with a small diameter part having a smaller diameter than the central hole arranged below the outer fitting part, and a receiving member detachably provided on the press-fitting bar and supporting the press-fitting bar. And a drive means for attaching and detaching the receiving member to and from the press-fitting bar.

[0006]

In the method for manufacturing an iron core according to claims 1 and 2, when the iron core piece is punched out, the iron core piece is punched while the press-fitting bar is supported by the receiving member, and the punched iron core pieces are sequentially pressed into the press-fitting bar. While being supported by the frictional resistance of the inner peripheral surface of the die and the outer peripheral surface of the outer fitting part of the press-fit bar, the caulking parts of the upper iron core pieces are successively fitted to the caulking parts of the lower iron core piece. As it is crimped firmly from the inner and outer peripheral directions, it is possible to improve the concentricity of the inner and outer diameters of the core piece that has been pulled into the die, and prevent the dish-shaped waist bending phenomenon that occurs in the core piece, and also the laminated cores. It is possible to increase the binding force between the two sides.

[0007]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is a sectional view of an essential part of an iron core manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is a partially enlarged perspective view of an iron core manufactured by the iron core manufacturing apparatus according to an embodiment of the present invention. Is shown.

As shown in FIG. 1, an iron core manufacturing apparatus 10 according to an embodiment of the present invention includes a punch 11 and a die 12 which are vertically arranged. The punch 11 is a member that punches the iron core piece 16 from a strip 15 on which a required shape of the iron core piece 16 such as the center hole 13 and the protruding caulking portion 14 (see FIG. 2) is formed at a predetermined pitch. A positioning hole 11a is formed on the lower surface. Die 12
It is internally fitted to the upper end of a vertical hole 18 bored in the lower die 17, and the lower part of the vertical hole 18 communicates with a horizontal hole 20 which is a discharge path for the manufactured iron core 19. The inner diameter of the die 12 is formed to be smaller than the outer diameter of the iron core piece 16, and the iron core piece 16 has a frictional resistance between the inner peripheral surface of the die 12 and the outer peripheral surface of the outer fitting portion 22 of the press-fitting bar 21, which will be described later. Laminated while being supported. The inner peripheral surface of the die 12 is expanded downward in a trumpet shape by 1 ′ to 2 ′ in order to reduce damage to the die 12 due to the cut end of the iron core piece 16.
The vertical holes 18 below 2 have a diameter slightly larger than the diameter of the die 12 so that the manufactured iron core 19 can be smoothly dropped. In the vertical hole 18, the punched iron core piece 1
A press-fitting bar 21 through which 6 is inserted is stored. An outer fitting portion 22 having a diameter slightly larger than that of the center hole 13 of the strip 15 is provided at the upper end portion of the press-fitting bar 21, and a part of the center hole 13 having a tapered shape is located below the outer fitting portion 22. A smaller diameter portion 23 having a smaller diameter is provided.

A thin horizontal hole 24 is communicated with the lower portion of the vertical hole 18 in an intersecting state. The horizontal hole 24 is detachably attached to the press-fitting bar 21 and supports the press-fitting bar 21 from below. The member 25 is accommodated so as to be slidable in the lateral direction.
The receiving member 25 is a long and thick plate member having a forked end, and is fixed to the tip of a rod 27 of an air cylinder 26 which is an example of a driving unit. When the rod 27 of the air cylinder 26 is projected, the forked portion 25a of the receiving member 25 is inserted into the support rod 28 vertically provided at the lower end of the small diameter portion 23, whereby the press-fitting bar 21 is supported by the receiving member 25 from below. It A delivery member 29 for delivering the manufactured iron core 19 in the direction of the arrow in FIG. 1 is slidably accommodated in the lateral hole 20. The carry-out member 29 is fixed to the tip of the rod 31 of the air cylinder 30. In the figure, reference numeral 32 indicates a feed guide for the strip 15 provided on the upper surface of the lower mold 17.

Next, an iron core manufacturing method using the iron core manufacturing apparatus 10 according to one embodiment of the present invention will be described.
In advance, a plurality of dummy iron core pieces or rings (not shown) are inserted through the upper end portion of the press-fitting bar 21, and the rod 27 of the air cylinder 26 is projected to arrange the receiving member 25 below the press-fitting bar 21. The press-fitting bar 21 is accurately held on the center line of the vertical hole 18 between the dummy core piece and the receiving member 25.

As shown in FIG. 1, when the core piece 16 is punched out from the strip 15 with the punch 11 and the die 12 centering on the center hole 13, the punched core pieces 16 are sequentially cut into the center holes 13. While being inserted into the press-fitting bar 21 and supported by the frictional resistance of the die 12 and the outer fitting part 22 of the press-fitting bar 21, at the caulking part of the lower dummy iron core piece,
The caulking portion 14 of the upper core piece 16 is fitted, and further the caulking portion 14 of the next iron core piece 16 is fitted and laminated one after another. At this time, the tip of the press-fitting bar 21 protruding above the center hole 13 is inserted into the positioning hole 11 a on the lower surface of the punch 11. With such punching of the iron core piece 16, the iron core pieces 16 that have been punched first are
When the iron core piece 16 for one iron core is moved from the outer fitting portion 22 to the small diameter portion 23 by being pushed down in the iron core 2, the iron core 19 is separated and drops onto the receiving member 25. After that, when the rod 27 of the air cylinder 26 is retracted and the receiving member 25 is pulled back, the rod 27 falls onto the carry-out member 29. After dropping, the rod 27 of the air cylinder 26 is projected again to return the receiving member 25 to the original position, and the air cylinder 30 is retracted.
Fall into the lateral hole 20. Then, the air cylinder 30
The rod 31 is projected and the unloading member 29 is slid laterally to unload the iron core 19. By repeating such an operation, the iron core 19 is continuously manufactured. The dummy iron core or ring is delivered first.
The iron core 19 as a product is manufactured from the second piece onward.

The iron core pieces 16 punched out by the punch 11 and the die 12 are successively inserted into the press-fitting bar 21 so that the frictional resistance between the inner peripheral surface of the die 12 and the outer peripheral surface of the outer fitting portion 22. Since it is firmly crimped from the inner and outer peripheral directions while being supported by, the concentricity of the inner and outer diameters of the core piece 16 drawn into the die 12 can be improved, and the dish-like waist bending phenomenon that occurs in the core piece 16 can be prevented, Moreover, it is possible to increase the bonding force between the laminated iron core pieces 16. Further, along with this, the inner and outer diameter dimensions of the iron core piece 19 are improved,
It is possible to prevent stacking blurring, improve verticality, warp, improve parallelism, and prevent end face blurring.

The present invention is not limited to this embodiment, and even if there is a design change within the scope of the invention, it is included in the present invention. For example, in the embodiment, the outer fitting portion is provided on the upper end portion of the press-fitting bar, but the present invention is not limited to this, and may be provided at a predetermined position of the press-fitting bar facing at least the upper part of the die. Further, in the embodiment, the air cylinder is exemplified as the drive means for the receiving member of the press-fit bar, but the drive means is not limited to this, and other drive means such as a hydraulic cylinder, an electric motor, a solenoid can be adopted. Further, as in a general iron core manufacturing method, when the core pieces are stacked, the die may be rotated by a predetermined angle so that the crimped portions of the stacked core pieces are skewed in a spiral shape.

[0014]

In the iron core manufacturing method and the manufacturing apparatus therefor according to claim 1, when the core piece is punched out in this manner, the core piece is punched while the press-fitting bar is supported by the receiving member, and the punched core piece is , Sequentially inserted into the press-fitting bar in a press-fitted state, and supported by the frictional resistance of the outer fitting part of the die and the press-fitting bar, the caulking part of the upper iron core piece is successively fitted to the caulking part of the lower iron core piece. As it is crimped firmly from the inner and outer peripheral directions, it is possible to improve the concentricity of the inner and outer diameters of the iron core piece that is pulled into the die, and prevent the dish-shaped waist bending phenomenon that occurs in the iron core piece, and also the laminated iron core. It is possible to increase the binding force between the two sides. Moreover, along with this effect, it is possible to improve the inner and outer diameter dimensions of the iron core piece, prevent stacking blur, improve verticality, prevent warpage, improve parallelism, prevent end face shake, and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an iron core manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of an iron core manufactured by the iron core manufacturing apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 10 Iron core manufacturing device 11 Punch 11a Positioning hole 12 Die 13 Center hole 14 Crimping part 15 Article 16 Core piece 17 Lower die 18 Vertical hole 19 Iron core 20 Horizontal hole 21 Press-fitting bar 22 Outer fitting part 23 Small diameter part 24 Horizontal hole 25 Receiving Member 25a Bifurcated portion 26 Air cylinder (driving means) 27 Rod 28 Support rod 29 Carrying out member 30 Air cylinder 31 Rod 32 Feed guide

Claims (2)

[Claims] 1. An iron core piece is punched by a punch and a die from a strip material in which a protruding caulking portion and a central hole are formed in advance, and the punched iron core pieces are successively inserted into the die in the die. In the manufacturing method of the core to produce a core by stacking while fitting, and then carry out the manufactured core, in the die, in the positioning hole formed in the lower surface of the punch at the time of punching the core piece. An outer fitting portion having an insertable upper end portion and having a diameter slightly larger than the central hole of the strip provided at a position facing at least the upper portion of the die,
A press-fitting bar of the iron core piece having a smaller diameter portion smaller than the central hole arranged below the outer fitting portion is housed, and the press-fitting bar is detachably attached to the press-fitting bar by driving means. Is provided with a receiving member that supports the press-fitting bar, when punching out the iron core piece, punching out the iron core piece while supporting the press-fitting bar by the receiving member, the punched-out core piece is sequentially, While being inserted into the press-fitting bar and supported by the frictional resistance of the die and the external fitting portion of the press-fitting bar, the caulking part of the lower iron core piece is successively fitted with the caulking part of the upper iron core piece. Then, the iron core including the predetermined number of the iron core pieces is manufactured, and the iron core manufacturing method. 2. A punch for punching out a bar material having a positioning hole formed on the lower surface and having a central hole and a protruding caulking portion at a predetermined pitch, a die paired with the punch, and a die housed in the die. And has an upper end portion that can be inserted into the positioning hole of the punch when punching the iron core piece punched by the punch, and further, from the central hole of the strip provided at a position facing at least the upper portion of the die. A slightly large-diameter outer fitting portion, a press-fitting bar of the core piece provided with a small-diameter portion having a diameter smaller than the central hole arranged below the outer fitting portion, and detachably provided on the press-fitting bar, An iron core manufacturing apparatus comprising: a receiving member that supports the press-fitting bar; and a drive unit that attaches and detaches the receiving member to the press-fitting bar.