JPH11308821A - Manufacturing method of laminated core - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a laminated iron core capable of reliably manufacturing a laminated iron core formed by bonding and bonding laminated iron core pieces without lowering dimensional accuracy and electrical characteristics. It is to provide a manufacturing method of. SOLUTION: The manufacturing method of the laminated core according to the present invention comprises:
A core piece 1 having a core piece main body portion 2 and a joining portion 3 is stamped and formed from a strip-shaped steel sheet W having a surface coated with a thermosetting adhesive g, and the core piece 1 and another piece that comes into contact with the core piece 1 are formed. A step of caulking and joining the respective joints 3 to the core pieces 1, and connecting and laminating a predetermined number of the core pieces 1, and then curing the thermosetting adhesive g to connect the core pieces 1 to each other. The method includes a step of adhesively bonding and a step of adhesively bonding the core pieces 1 to each other and then removing the joint 3 from the core piece main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated core formed by bonding laminated core pieces together.

[0002]

2. Description of the Related Art A laminated iron core such as a stator or a rotor of an electric motor is formed by a mold device having a die and a punch.
It is manufactured by stamping and forming core pieces of a predetermined shape from a material plate such as a strip-shaped steel plate and bonding together a predetermined number of laminated core pieces.

[0003] Here, as means for connecting the iron core pieces,
Conventionally, caulking has been adopted, but since distortion occurs near the caulked portion of the core piece, a gap is created between the laminated core pieces, and the caulked part is added to the laminated iron core as a product. Is disadvantageous in that the electrical characteristics of the laminated core are adversely affected by the presence of the iron core.

[0004] In order to solve such inconvenience, a predetermined number of iron core pieces punched and formed from a material plate having a surface coated with a thermosetting adhesive are laminated inside a die in a mold apparatus, and then laminated on the die. There has been provided a method for manufacturing a laminated core in which laminated core pieces are adhesively bonded to each other by heating a thermosetting adhesive by heating with a provided heater.

[0005]

By the way, in the above-described method for manufacturing a laminated core, the core pieces stamped and formed from the material plate are sequentially stacked inside the die. Since there is no connection between them, there is a risk that a gap may be formed without the core pieces sticking together.If the core pieces are bonded together with a gap between them, the dimensional accuracy of the laminated core In addition to the inconvenience, the electrical characteristics were adversely affected.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to reliably manufacture a laminated iron core formed by bonding and bonding laminated iron core pieces without lowering dimensional accuracy and electrical characteristics.
An object of the present invention is to provide a method for manufacturing a laminated core.

[0007]

In order to achieve the above object, a method of manufacturing a laminated iron core according to the present invention comprises a method of manufacturing a laminated iron core from a material plate having a surface coated with a thermosetting adhesive. A core piece having a main body and a joint protruding from the core piece main body is punched and formed, and each of the joints between the punched core piece and another core piece abutting on the core piece is caulked. A predetermined number of core pieces are connected to each other and laminated, and then a thermosetting adhesive is cured to adhesively bond the laminated predetermined number of core pieces to each other; Removing the joint from the iron core body after the number of iron cores are bonded and bonded to each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. 1 to 7 show an example in which the method for manufacturing a laminated core according to the present invention is applied to the production of a stator (laminated core) in an electric motor. It is needless to say that the method for manufacturing a laminated core according to the present invention is carried out in a mold apparatus (not shown) having a die and a punch.

In the method for manufacturing a laminated core according to the present invention,
As shown in FIG. 1, first, a core piece 1 having a predetermined shape is stamped and formed from a strip-shaped steel plate W as a material plate.

Here, the strip-shaped steel sheet W is provided on its front surface (back surface) with, for example, an epoxy resin-based thermosetting adhesive g.
Is applied very thinly over the entire surface.

On the other hand, as shown in FIGS. 1 and 2, the iron core piece 1 is connected to the iron core body 2 and four joints 3, 3, 3, 3.
And 3.

The core piece main body 2 is a part constituting a laminated iron core 100 (see FIG. 5) as a product. The core piece main body 2 has a quadrangular appearance with no corners and has a large number of salient poles 2a, 2a are provided.

Each of the joints 3 is connected to the core piece main body 2.
And is formed in such a manner as to protrude from each side, and is formed of a caulking portion 3a having a rectangular shape, and a thin rib 3b connecting the caulking portion 3a and the iron core piece main body 2. In addition,
The width of the rib 3b is set to about the thickness of the strip-shaped steel sheet W, and is set to 0.5 mm to 0.7 mm in this embodiment.

In the manufacturing method of the present invention, as shown in FIG. 1, a core piece 1 having a predetermined shape is formed by punching from a steel strip W, and the punched core piece 1 is formed by punching first. The core piece 1 laminated and punched and formed on the other core piece 1 accommodated in the core piece 1 (not shown) and the other core piece 1 are caulked at their joints 3 (caulking portions 3a). Are connected to each other by

That is, the core piece 1 is stamped and formed, and at the same time, the lamination on the other core plate 1 and the swaging connection with the other core piece 1 are performed.

Thereafter, a predetermined number of core pieces 1, 1... Constituting the laminated core 100 are laminated by repeatedly punching and forming the core pieces 1 from the strip-shaped steel sheet W.

As shown in FIG. 3, a layer of a thermosetting adhesive g is interposed between the laminated core pieces 1, 1,..., And the adjacent core pieces 1 are caulked to each other. Therefore, the thermosetting adhesive g is in close contact with the surface of the iron core piece 1.

In order to separate the lowermost and uppermost core plates 1 of the predetermined number of core pieces 1, 1... Constituting one laminated core 100 from other core plates constituting the laminated core. Is not different from the conventional manufacturing method, and the description is omitted.

After laminating a predetermined number of core pieces 1, 1..., The thermosetting adhesive g is cured by a heating heater (not shown) installed inside the die in the mold apparatus. The laminated iron core pieces 1, 1... Are integrally bonded to each other to manufacture an assembly 10 as shown in FIG.

Next, after taking out the assembly 10 from the mold apparatus (not shown), the joints 3, 3... Are removed from the core piece main body 2 of the assembly 10. Here, since each of the joints 3, 3... Is merely connected to the core piece main body 2 via the thin rib 3b, the joint 3 is cut by cutting the caulking portion 3a and breaking the rib 3b. It can be easily cut off from the main body 2.

As described above, the core piece main body 2 of the assembly 10
Are removed from each other to complete a laminated iron core 100 as a final product as shown in FIG.

As described above, in the manufacturing method according to the present invention, the core piece 1 is stamped out of the strip-shaped steel sheet W, and at the same time, the core piece 1 is caulked to the other core sheet 1, so that the core piece 1 is laminated. Adjacent iron core pieces 1
It will adhere to each other via the thermosetting adhesive g,
Accordingly, it is possible to prevent a reduction in dimensional accuracy and electrical characteristics due to the core pieces not being in close contact with each other.

As described above, each of the joints 3, 3... Which are caulked from the core piece main body 2 of the assembly 10.
Is removed, the crimped portion does not exist in the laminated iron core 100 as a product, and therefore, there is no adverse effect on the electrical characteristics of the laminated iron core due to the presence of the crimped portion.

In the above-described embodiment, the laminated core pieces 1, 1,... Are heated by the heater installed inside the die so as to be bonded and bonded to each other. Are integrally connected by caulking, so that they can be taken out of the mold apparatus and heated.

In this manner, the core pieces 1, 1... Stacked in a predetermined number are taken out of the mold apparatus and subjected to a heat treatment, thereby eliminating the need for a special mold apparatus having a heater for heating. Can be manufactured, thereby making it possible to suppress an increase in manufacturing equipment and an increase in manufacturing cost as much as possible.

The core piece 1 'shown in FIGS. 6 and 7 comprises a core piece main body 2' and four joints 3 ', 3'..., And the core piece main body 2 'has a quadrangular appearance. Are provided at the center thereof, and a large number of salient poles 2a ', 2a',...
a 'and a thin rib 3b'. Each joint 3 'is formed to protrude from a concave portion 2b' provided on each side of the core piece main body 2 '. In addition, the width of the rib 3b 'is set to about the thickness of the strip-shaped steel sheet W, and is set to 0.5 mm to 0.7 mm in this embodiment.

Here, the method of manufacturing the laminated core using the above-described core piece 1 'is not different from the method of manufacturing the laminated core shown in FIGS. It is possible to prevent the electrical characteristics from being lowered.

Further, in the iron core piece 1 'having the above-mentioned shape,
When the joining portion 3 'is removed from the normal state of FIG. 7A as shown in FIG. 7B, the rib 3b' which has been cut off becomes the core piece main body 2 '.
Does not protrude from the outer edge 2c 'of the casing, so that when the laminated core is accommodated in the casing, interference between the casing and the laminated core can be prevented.

An iron core piece 1 "shown in FIG. 8 has a caulking portion 3a".
And a rib 3b "having a neck shape are formed so as to protrude from a concave portion 2b" provided on each side of the core piece main body 2 ". 6 and the core piece 1 'shown in Fig. 7. Note that the width of the rib 3b "is set to about the thickness of the strip-shaped steel sheet W, and is set to 0.5 mm to 0.7 mm in this embodiment. ing.

Here, the method of manufacturing the laminated core using the above-described iron core piece 1 ″ is not different from the method of manufacturing the laminated core shown in FIGS. It is possible to prevent the electrical characteristics from being lowered.

In the core piece 1 ″ having the above-described shape, when the joint 3 ″ is removed from the normal state of FIG. 8A as shown in FIG. Since it does not protrude from the outer edge 2c "of the main body 2", when the laminated core is accommodated in the casing, interference between the casing and the laminated core can be prevented.

In the above-described core piece 1 ", the joint 3" is connected to the core piece body 2 "via the neck-shaped rib 3b".
Therefore, the step of removing the joining portion 3 "from the iron core piece main body 2" can be carried out extremely easily by breaking the rib 3b ".

In the above-described embodiment, the core piece including the square core piece main body and the four joints constituting the substantially square pole-shaped stator is exemplified. It is also possible to form an iron core piece by providing an appropriate number of joints in the disk-shaped iron core piece main body to be configured.

That is, the shape of the core piece main body in the core piece is determined based on the shape of the laminated core to be manufactured, and the joint provided on the core piece main body has various shapes such as the shape of the core piece main body. Can be set as appropriate based on the above condition.

The method of manufacturing a laminated iron core according to the present invention is applicable not only to a stator and a rotor of an electric motor, but also to an I-type and an E-type.
It goes without saying that the present invention can be effectively applied as a method for manufacturing various types of laminated cores such as a laminated core of a mold.

[0036]

As described in detail above, the method for manufacturing a laminated core according to the present invention comprises the steps of: forming a laminated core from a material plate having a surface coated with a thermosetting adhesive; A core piece having a joint protruding from the core piece main body is punched and formed, and the punched core piece and another core piece abutting on the core piece are connected to each other by caulking each joint. And bonding and bonding a predetermined number of core pieces to each other, and then bonding and laminating the predetermined number of core pieces to each other by curing the thermosetting adhesive. Removing the bonding portion from the iron core piece main body after bonding them to each other. According to the above configuration, since the core pieces are stamped and formed from the material plate, and at the same time, the core pieces and the other core plates are connected by caulking, the core pieces overlapping in the stacked state are inadvertent gaps. , And adhere to each other via the thermosetting adhesive. Therefore, according to the method of manufacturing a laminated core according to the present invention, it is possible to reliably produce a laminated core formed by adhesively bonding laminated core pieces without lowering dimensional accuracy and electrical characteristics. Become.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a material plate, a core piece, and the like showing a method of manufacturing a laminated iron core according to the present invention.

FIG. 2 is a plan view showing an iron core piece stamped and formed from a material plate according to the present invention.

FIG. 3 is a conceptual diagram showing the state of lamination of iron core pieces in the manufacturing method of the present invention.

FIG. 4 is an external perspective view showing an assembly manufactured according to the present invention.

FIG. 5 is an external perspective view showing a laminated core manufactured according to the present invention.

FIG. 6 is a plan view showing another embodiment of the iron core piece in the manufacturing method of the present invention.

FIGS. 7A and 7B are plan views of a main part showing a state where the joints of the iron core pieces shown in FIG. 6 and the joints are removed;

8 (a) and 8 (b) are plan views of a main part showing still another embodiment of the iron core piece in the manufacturing method of the present invention.

[Explanation of symbols]

 W: strip-shaped steel plate (material plate), g: thermosetting adhesive, 1, 1 ', 1 ": iron core piece, 2, 2', 2": iron core body part, 3, 3 ', 3 "... joining Part, 100 ... laminated iron core.

Claims (1)

[Claims] 1. A core piece having a core piece main body constituting a laminated core and a joint projecting from the core piece main body is punched and formed from a material plate having a surface coated with a thermosetting adhesive. A step of connecting the punched-formed core piece and another core piece in contact with the core piece to each other by caulking each of the joints, and connecting and laminating a predetermined number of the core pieces to each other After doing
Curing the thermosetting adhesive to adhesively bond a predetermined number of the laminated core pieces to each other; and after bonding and bonding the predetermined number of the core pieces to each other,
Removing the joint from the core piece main body. A method of manufacturing a laminated core, comprising: