JPH05304037A - Manufacturing method of laminated core - Google Patents

Abstract

PURPOSE:To manufacture the title laminated core capable of sustaining the insulation property and reducing the magnetic leakage between cores. CONSTITUTION:The surface and rear surface of a material for stamping cores 1 are respectively coated with bonding agents 2, 3 comprising two-liquid type bonding agent so that the cores 1 stamped out by a press machine may be bonded in a mold so as to form a core block. Furthermore, the continuous core manufacturing step by feeding the coil material to the press machine is composed of the two steps i.e., the first step coating the surface of the coil material with the first bonding agent out of the two-liquid type bonding agent immediately before the coil material is fed to the press metallic mold and the second step coating the rear surface of the coil material with the second bonding agent so that the cores 1 may be stamped out by the press metallic mold to bond the cores 1 in the mold for the formation of the core block.

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 for a motor or a transformer.

[0002]

2. Description of the Related Art In the prior art, a method for manufacturing a laminated core is to assemble a set of cores by die-casting or welding the number of cores outside the press. One set is assembled by fitting into the cut and raised portions provided on the core by pressing in the mold. Laminate a specified number of sheets in a die and laser weld them to assemble one set (eg, Japanese Patent Publication 6).
No. 2-14087).

Among the above-mentioned prior arts, the method (1) has a problem that it is difficult to automate itself due to many steps. The method of (1) has the problems that the die becomes expensive, there is a restriction on increasing the spm of the press, the precision of the bottom dead center of the press is required to be high, and the stacking thickness varies.
This method requires an expensive laser device, high precision of press bottom dead center is required, magnetic leakage at the welded part, and a large core requires an increased number of welding points. There is a problem with this.

Further, the plate thickness of the coil material used to manufacture the core has a very small difference between the central portion and the both end portions of the material, and therefore, when a plurality of sheets are laminated, the core block has one of them. It may tilt. Therefore, usually, the cores of the core block are finished in parallel by changing the stacking direction of the cores one by one or a plurality of cores. However, if the cores are not symmetrical, the stacking direction is Since it cannot be changed, the inclination of the core block was an unavoidable problem.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a laminated core which retains insulation and reduces magnetic leakage between cores.

[0006]

The means for solving the problems in the present invention is a core punched by a press, in which an adhesive liquid of a two-component adhesive is separately applied to the front surface and the back surface of a material for punching the core. Is bonded in a mold to form a core block.

Another means for solving the problem in the present invention is a method of supplying a coil material to a press die to continuously produce a core, immediately before supplying the coil material to the press die and First of two-component adhesive on the surface of coil material
The process includes applying an adhesive liquid, applying a second adhesive liquid to the back surface of the coil material, and punching the core with the press die. The core punched by a press is adhered in the die to form the core. It is characterized by forming blocks.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view showing an example of a core, FIG. 2 is a sectional view of a laminated core manufactured by the method of the present invention, FIG. 3 is a work process diagram for carrying out the method of the present invention, and FIG. 4 is a laminated core. FIG. 6 is a cross-sectional view showing a portion where is separated into blocks.

In FIG. 1, reference numeral 1 denotes a core punched from a steel plate, and adhesives 2 and 3 are applied to the front and back surfaces of the core. It should be noted that the adhesive used is a two-liquid type, and the first adhesive liquid 2 is applied to the front surface and the second adhesive liquid 3 is applied to the rear surface.

FIG. 2 shows a core block 4 formed by stacking cores 1 together.
Is formed, and the joint surface of each core 1 is adhered by the first adhesive liquid 2 and the second adhesive liquid 3.
Since a predetermined number of the core blocks 4 are laminated and then shaped by pressing, the gap between the cores can be minimized by utilizing the surface tension of the adhesive liquid, and the thickness of each core varies. Even if there is, the parallelism of the entire core block can be maintained.

Next, the process of manufacturing the laminated core will be described with reference to FIG. The coil material 10 is supplied to the first and second press dies 12 and 13 via the feed roll 11. In the embodiment, the rotor 14 of the motor is punched by the first press die 12, and the stator 1 of the motor is punched by the second press die 13.
5 is punched out. Immediately before the coil material is supplied to the first press die 12, and the first adhesive liquid is applied to the surface of the coil material by the application roller 16 provided on the upper surface of the coil material supply line. The second adhesive liquid is applied to the back surface of the coil material by the first and second nozzles 17 and 18 provided immediately before the first and second press dies 12 and 13 and on the lower surface of the coil material supply line.

Although the adhesive liquid as the second liquid is sprayed from the first and second nozzles 17 and 18, the nozzle is interlocked with the driving unit of the press machine to set the timing of not spraying every predetermined number of sheets. However, this allows the rotor and the stator to be separated for each core block. The second nozzle 18 is for the stator, and it is preferable to set a plurality of ports.

The cores punched out by the first and second press dies 12, 13 are coated with the first adhesive liquid on the front surface and the second adhesive liquid on the rear surface, respectively. , The first and second adhesive liquids are applied to the opposite surfaces, and thus the cores are laminated and pressed at the same time to bond the cores to each other by the first and second adhesive liquids, thereby forming the core block. It Further, as shown in FIG. 4, by setting the core to which the second adhesive liquid is not applied for every predetermined number of sheets, the core block can be separated at the position of the core.

[0014]

According to the present invention, a two-component adhesive liquid is separately applied to the front and back surfaces of a material for punching a core, and the core punched by a press is bonded in a mold to form a core block. By making the adhesive liquid have insulating properties, magnetic leakage between the cores is reduced, and the surface tension of the adhesive liquid is used to minimize the gap between the cores and correct the variation in the plate thickness. To obtain the parallelism of each core,
Therefore, a highly accurate laminated core can be obtained.

Further, in the present invention, the core block can be easily separated by setting the timing at which the adhesive liquid as the second liquid is not applied every predetermined number of sheets.

In addition to the above, according to the present invention, as the press die, the die currently used can be utilized, since the laser device is not used, the cost for these is unnecessary, and the pressure contact force is small. Therefore, there is an effect such that the precision of the bottom dead center of the press can be tolerated.

[Brief description of drawings]

FIG. 1 shows an example of a core, A is a plan view and B is a sectional view.

FIG. 2 is a cross-sectional view of a laminated core manufactured by the method of the present invention.

FIG. 3 is a work process diagram for carrying out the method of the present invention.

FIG. 4 is a cross-sectional view showing a portion where the laminated core is separated into blocks.

[Explanation of symbols]

 1 Core 2 First Adhesive Liquid 3 Second Adhesive Liquid 4 Core Block 10 Coil Material 11 Feed Roll 12 First Press Die 13 Second Press Die 14 Rotor 15 Stator 16 Coating Roller 17 First Nozzle 18 Second Nozzle

Claims (3)

[Claims] 1. A core punching material is provided on the front surface and the back surface of the material.
A method for producing a laminated core, which comprises individually applying an adhesive liquid of a liquid adhesive and adhering a core punched by a press in a mold to form a core block. 2. A method of continuously producing a core by supplying a coil material to a press die, wherein a first bonding of a two-component adhesive is performed on the surface of the coil material immediately before the coil material is fed to the press die. A core block comprising a step of applying a liquid, a step of applying a second adhesive liquid on the back surface of the coil material, and a step of punching out the core with the above-mentioned press die. A method of manufacturing a laminated core, comprising: forming a laminated core. 3. The core block is continuously formed by interlocking the timing of applying the second adhesive liquid on the back surface of the coil material with the drive unit of the press and setting the timing of not applying the second adhesive liquid for every predetermined number of sheets. The method for producing a laminated core according to claim 2, wherein the laminated core is produced.