JP2005269732A - Method of manufacturing iron core and apparatus suitable for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus of largely improving workability of punching/fixing step of an iron core when fixing a normal magnetic steel sheet using an adhesive. <P>SOLUTION: The method of manufacturing a laminated iron core includes, in the step of punching the magnetic steel sheet in a predetermined shape and fixing as a unit iron core, the steps of (1) punching a steel sheet in a predetermined shape with a mold, (2) laminating the punched unit iron cores, (3) coating a paste-like adhesive in a point-like or a linear-like manner on the surface of the iron core during laminating or after the lamination, and then (4) integrating the laminated iron core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a laminated iron core such as a motor or a transformer, and a manufacturing apparatus suitable for the method.

  As a method of manufacturing laminated iron cores such as motors and transformers using electromagnetic steel sheets, the steel sheets are punched into unit iron cores, and a predetermined number of unit iron cores are laminated, and then bolted, caulked, welded, or adhesives are used. Generally, it is fixed using means such as varnish. After being fixed, the laminated iron core is subjected to processing such as incorporation of a winding coil, and used as an iron core for a transformer or a motor.

If the laminated iron core is weakly fixed, unwinding or opening a gap in the unit iron core will reduce the efficiency of coil winding work, and in the case of a motor, it may cause noise and vibration. It is necessary to stick firmly.
However, when fixing by bolting, it is necessary to provide a through-hole through which the bolt passes in the laminated iron core, and if a through-hole is provided in the laminated iron core, the magnetic properties of the laminated iron core will deteriorate. Similarly, when the laminated iron core is fixed by welding, the welded portion is thermally strained, and by caulking, the magnetic properties of the laminated iron core may be deteriorated by being machined when forming the dowel.

When fixing the laminated iron core using an adhesive, after laminating the magnetic steel sheet into an iron core shape, laminating it and temporarily immersing it with a clamp etc., it is then immersed in a bath containing an adhesive or varnish, The liquid adhesive is dropped from above, and the adhesive or varnish is infiltrated into the gap between the steel plates using a capillary phenomenon, and then fixed by heating or the like. However, the adhesive or varnish does not penetrate into the deep part of the gap. Especially in the case of a motor stator, only the end of the outer periphery of the iron core into which the adhesive has penetrated adheres, and the teeth on the inner periphery become free. The problem is that both ends of the laminate are lifted, the viscosity of the adhesive and varnish is too low when heated, excess adhesive and varnish flow out, the fixing strength decreases, and it is difficult to process the flowed-out adhesive There was a problem.
In addition, since it takes time for the adhesive or varnish impregnation to be fixed after application, there is a problem that workability is low.

  In order to solve such problems, Patent Document 1 discloses that when a laminated iron core is completely impregnated, an insulating curing agent or a curing agent and a curing accelerator are attached to a steel plate constituting the laminated iron core in advance. Then, a method of laminating and winding and then impregnating is disclosed. This is because when the laminated iron core is fixed by impregnation, the hardener is attached in advance, and the impregnating resin is rapidly cured, thereby preventing the adhesive from flowing out and firmly fixing the steel plates to each other. At the same time, insulation is ensured.

  However, even in this method, it is necessary to apply the adhesive to each steel sheet constituting the laminated iron core, and then impregnate the resin again. The problem that the workability from the processing to the time of fixing the laminated iron core is low is not solved. In general, devices that automatically supply adhesive are also commercially available, but the adhesive hardens at the supply port during a pause, so maintenance is complicated, and the amount of adhesive applied depends on the viscosity of the adhesive solution due to temperature. There was a problem that it fluctuated.

In view of this, the present inventors disclosed in Patent Document 2 a method for applying an adhesive from a partial surface or an end surface of an iron core during lamination of unit iron cores and a manufacturing apparatus therefor. In this method, since the coating is not performed on the entire surface of the iron core, the coating workability is improved and a strong laminated iron core can be obtained.
Japanese Patent Laid-Open No. 57-3560 JP 2002-151339 A

However, in the technique disclosed in Patent Document 2, since a liquid adhesive is dropped on a specific part of the iron core surface, the amount of adhesive adhering to the iron core varies, and the laminated iron core is firmly fixed. If you try to do so, a lot of adhesive will adhere and the space factor will decrease, or if the amount of dripping is small, the part where the adhesive has adhered and the part where it will not adhere can be made uneven, and the adhesive strength of the laminated iron core will decrease There was a problem I said.
Further, it has been found that there is a problem that surplus adhesive may adhere to the periphery of the adhesive discharge part for dripping, resulting in poor maintainability.
The present inventors have solved the problem in the case of fixing a laminated iron core using such an adhesive, found a method capable of obtaining a laminated iron core with good workability, and an apparatus suitable for the method, and the present invention. Has reached

In order to solve the above problems, the present invention is summarized as follows.
(1) In a method of manufacturing a laminated iron core, in which a laminated iron core is integrated by punching a magnetic steel sheet into a predetermined shape, forming a unit iron core, laminating and fixing the punched unit iron cores, A method for producing a laminated iron core comprising: applying a paste-like adhesive to the surface of a unit iron core in the form of dots or lines, and then applying pressure.
(2) The method for producing a laminated iron core according to (1), wherein the viscosity of the paste adhesive is 0.1 to 1000 Pa · s.
(3) The above-described (1) or (2), wherein the unit iron core is applied in a non-contact manner by discharging a paste-like adhesive in the form of droplets from a nozzle of a coating device onto the front surface or the back surface or both surfaces thereof. The manufacturing method of the laminated iron core of description.
(4) Applying a paste-like thermosetting resin adhesive to the surface of the laminated iron core during lamination of the unit iron cores, heating the laminated iron core to a predetermined temperature, and pressurizing it to integrate the laminated iron cores The method for producing a laminated iron core according to any one of (1) to (3), wherein:
(5) Paste thermosetting resin adhesive is applied to the surface of the unit iron core during or immediately after the punching process, and the unit iron core to which the paste thermosetting adhesive is adhered is laminated, and the laminated iron core is heated to a predetermined temperature. The method for producing a laminated iron core according to any one of (1) to (4), wherein the laminated iron core is integrated by heating and pressurizing.
(6) Any one of the above (1) to (5), characterized in that it has two or more unit iron core laminated portions, and is continuously punched, laminated and fixed by replacing the laminated portions immediately after a predetermined number of layers are laminated. 2. A method for producing a laminated iron core according to item 1.

(7) A magazine section for storing the punched unit iron core, a holding section for holding each unit core, and a paste-like adhesive on the front surface, the back surface, or both surfaces of the held unit iron core. An apparatus for producing a laminated iron core, comprising: an application part that is applied in a shape; and a lamination part that laminates unit iron cores after application of an adhesive.
(8) A punching section having a male punching die and a female punching die is provided, and a unit iron core laminated portion for laminating the punched unit iron cores is provided separately, and a paste-like adhesive unit is provided. An apparatus for producing a laminated iron core, comprising an adhesive supply unit for applying the iron core in a dotted or linear manner on a steel sheet surface.
(9) The apparatus for producing a laminated iron core according to (7) or (8), wherein the unit iron core laminated part is provided with a pressure mechanism.
(10) The apparatus for producing a laminated iron core according to any one of (7) to (9), wherein the unit iron core laminated part includes a pressurizing and heating mechanism.
(11) The above-mentioned (7) to (10), wherein the adhesive supply section for applying the paste adhesive includes a needle and a dispenser section, and controls the application amount by discharging the adhesive using air pressure. The manufacturing apparatus of the laminated iron core of any one of these.
(12) The adhesive supply unit for applying the paste-like adhesive includes a needle and a dispenser unit, and discharges the adhesive using air pressure to control the application amount and apply it to the iron core surface in a non-contact manner. The manufacturing apparatus of the laminated iron core according to any one of (7) to (11).
(13) The apparatus is characterized by comprising two or more unit iron core laminated parts, and continuously punching and fixing by providing an exchange device and a unit iron core discharging device for exchanging the laminated parts immediately after a predetermined number of layers are laminated. (7) The manufacturing apparatus of the laminated iron core of any one of (12).

  According to the present invention, it is possible to continuously fix the iron core in the punching process of the laminated iron core using an adhesive and not the fixing using the conventional impregnation equipment. The core can be fixed, and the workability of the fixing process of the laminated iron core is greatly improved. Further, since a paste adhesive is used, handling is simple and maintenance is easy. Furthermore, there is little protrusion or unevenness of the adhesive by applying it in the form of dots or lines, and an iron core having a good space factor can be manufactured.

Hereinafter, specific modes for carrying out the present invention will be described.
In the present invention, the electromagnetic steel sheet used for the laminated iron core is not particularly limited, and can be used for both non-oriented electrical steel sheets and directional electrical steel sheets, and can be used without problems with general thin steel sheets. An alloy or the like can also be used, and is particularly suitable for the use of a thin steel plate having a plate thickness of 0.10 to 0.35 mm. However, the material having a normal plate thickness is not limited.

  In the present invention, the processing of the unit iron core requires an apparatus for punching a steel sheet into a unit iron core shape by a punching die, and after processing into a unit iron core shape by the punching die of the punching part, the laminated portion When the unit iron cores are continuously laminated, the laminated iron core is fixed by applying a paste-like adhesive in the form of dots or lines on the surface or end face of the steel sheet.

The adhesive used in the present invention is not particularly limited as to the type of resin, but acrylic resin adhesive, cyanoacrylate adhesive, epoxy resin adhesive, polyester adhesive, polyurethane adhesive, melamine resin adhesion Various adhesives such as an adhesive and a phenol resin adhesive can be used. More suitable is a thermosetting organic resin adhesive that undergoes a chemical reaction by heating, specifically, one or more of epoxy resin, phenol resin, urethane resin, melamine resin, etc. Is an adhesive mainly composed of
Also suitable are polyesters, acrylic resins and the like to which a crosslinking agent has been added to impart thermosetting properties. Moreover, you may use the inorganic adhesive which has a dehydration condensation reaction as it heats and hardens | cures, the inorganic adhesive which has calcium phosphate etc. as a main component. When heating is not preferred, it is also possible to use a pressure curable adhesive in which a curing agent is encapsulated in a microcapsule that bursts under pressure.

  The adhesive used in the present invention needs to be in a paste form. The pasty form needs to have a viscosity in the range of 0.1 to 1000 Pa · s, preferably 0.5 to 600 Pa · s, more preferably 20 to 50 Pa · s. . Most of the instantaneous adhesives usually used for motor cores and the like are about 0.001 Pa · s. However, in the present invention, when the viscosity is less than 0.1 Pa · s, the adhesive is easy to flow and accurate application becomes difficult. When the pressure exceeds 1000 Pa · s, the adhesive that adheres to the steel sheet after it is heated and pressed is difficult to collapse and the space factor deteriorates. In addition, when the viscosity is in the range of more than 20 Pa · s and less than 50 Pa · s, there is no leakage from the syringe even when the pressure is applied for a long time, and the air pressure adjustment is easy and the workability is good. There is no particular limitation on making the adhesive into a paste, but it can be made into a paste by adjusting the molecular weight distribution of the adhesive monomer, mixing two or more monomers, or selecting a curing agent. It is.

  In the present invention, it is necessary to apply the paste adhesive in the form of dots or lines. The dot shape referred to in the present invention refers to a state in which the amount of adhesive extruded from the needle tip is extremely small and a very small amount of adhesive before being spread on the surface of the iron core is adhered. About 1 to 5 mm, preferably 0.5 to 2 mm, and the amount of the adhesive is about 0.001 to 3 mg, although it depends on the type. In the case of a linear shape, dot application is continuous, and can be applied to an arbitrary length with a width of about 0.1 to 5 mm, preferably 0.5 to 2 mm.

In this invention, it can apply | coat to the surface of a unit iron core, a back surface, or its both surfaces, and it does not specifically limit, Moreover, a needle front-end | tip may contact a steel plate surface, or it may be non-contact. In the case of non-contact, the viscosity is preferably in the range of 1 to 70 Pa · s, particularly in the range of 1 to 10 Pa · s, and the appropriate viscosity range is different from that in the case of contact, so care should be taken.
When the laminated iron core is fixed using the paste-like adhesive used in the present invention, the position where the adhesive is applied and the amount of the adhesive can be controlled more accurately than in the past. As a result, the average space factor improves.

  In the case of heating in the present invention, as heating means to be used, electric heating, induction heating, dielectric heating, electromagnetic wave irradiation, direct contact heating, etc. can be used, and although not particularly limited, direct contact heating by an electric heater has a structure. Simple and suitable. In the present invention, the paste-like adhesive applied to the laminated iron core can be rapidly melted and cured by heating by installing the heating device in the laminated part and heating.

  Next, as a method of applying pressure to fix the iron core, a pressure cylinder or a pressure punch is used in the present invention, and the pressure punch can be used also as a male die of a punching die. In this case, when the predetermined number of punches is reached, it is possible to apply a large pressure to the laminated iron core by making the male stroke larger than the normal punch stroke, thereby further increasing the fixing strength. it can. Moreover, in order to make the fixed laminated iron core stronger, after this step, it may be heated under pressure again.

In the present invention, as a method of applying an adhesive, workability is lowered by using a method of applying a paste-like adhesive from an application nozzle provided with a needle on each surface of a steel plate before lamination. It is possible to apply the adhesive without it.
The needle used in the present invention is an injection needle having an inner diameter of 0.1 to 3.0 mm, an outer diameter of 0.2 to 4.0 mm, and a length of 5 to 20 mm. The material may be metal or plastic. No problem. In the present invention, such a needle depends on the shape of the unit iron core, but 10 or more needles are arranged according to the shape of the unit iron core.

  In the present invention, it is possible to greatly increase productivity by using a nozzle having a shape that matches the unit core. In other words, by installing a needle on the nozzle corresponding to the outer periphery or teeth of the unit iron core, it is possible to uniformly apply the adhesive to the entire iron core at once, even if it is dotted or linear. become.

  In the present invention, any adhesive supply system may be used, but a syringe filled with an adhesive, a dispenser, and a nozzle are connected, and the pressure air is controlled by the dispenser, whereby the adhesive is dispensed from the syringe. An air dispensing method in which a necessary amount of adhesive is applied through a needle and applied in a necessary amount is simple and preferable. The adhesive can be supplied simply by exchanging the syringe, and the adhesive can be reliably sent to the nozzle by using air pressure.

  As a conventional iron core fixing technique using an adhesive, a liquid adhesive with low viscosity is dropped and applied to the surface of the steel plate, then pressed, or poured into the gap between the iron cores after lamination. However, in the laminated iron core of the present invention, a relatively high-viscosity paste-like adhesive is used, and the iron core is adhered to the surface of the iron core in a dotted or linear form, and then the laminated iron core is fixed by heating and pressing. There is a feature in the place to do. Normally, when a paste-like adhesive is applied over a large area, it takes time to flow because of its viscosity, and therefore, it is used for fixing laminated iron cores such as motors and transformers because it reduces efficiency. It was limited. In this invention, the problem at the time of using such a paste-form adhesive agent can be avoided by apply | coating to a dotted | punctate form or a linear form.

  Conventionally, a low-viscosity adhesive has been used as an adhesive for fixing a laminated iron core. In the technique disclosed in Patent Document 2, an adhesive is dropped from the end surface using a capillary phenomenon. However, when dripping, it is applied by dropping from the upper side of the unit core to the steel plate surface using gravity, and the end face application uses a capillary phenomenon. It does not penetrate in between.

  On the other hand, in the present invention, even when non-contact application is performed by an air dispenser method, the size of the droplet is a very small amount of about several mg, and air pressure is used for application and gravity is not used. It is also possible to apply non-contact to the back surface of the film. In addition, since it is paste-like in this invention, it is a viscous area | region where a capillary phenomenon does not generate | occur | produce practically, and is fundamentally different from the technique disclosed by the said patent document 2. FIG.

  In the case of heating in the present invention, a heat insulating member can be installed between the punching die and the heating device. The temperature required for curing the organic resin thermosetting adhesive is generally between 150 and 200 ° C., and in the case of an inorganic adhesive, it is 400 to 700 ° C. Since high accuracy is required, it is necessary to prevent heat from being transmitted to the heated portion by the heat insulating member so that the mold does not expand. The heat insulating member used here is desirably a material having high heat resistance such as ceramics, but is not particularly limited.

In the present invention, when the temperature needs to be increased by using a thermosetting adhesive, after a predetermined number of unit iron cores are laminated, or while they are being laminated, they are laminated by a heating device installed adjacent to the laminated portion. The iron core is heated to a predetermined temperature. Further, in the present invention, it is possible to further increase the efficiency by providing two or more laminated portions and installing the laminated portion movable device so that these can be arranged immediately after the punched portion.
After completion of lamination or whenever a unit iron core is supplied, it is pressurized and heated with a pressure device, the paste adhesive is heated and cured, and the laminated unit iron core is bonded in whole or in part to iron. The core is fixed. The arrangement of the laminated parts is not limited to a method of moving in the direction perpendicular to the steel sheet supply direction, but may be a rotating method in which a large number of laminated parts are arranged in a circle, or other methods may be used.
Furthermore, after laminating unit iron cores, it can be moved from a position immediately after the punched portion, and then pressed again with a pressurizing device to be firmly fixed.

  In the present invention, the following configuration can be considered as an apparatus suitable for the iron core manufacturing method described above. In other words, a unit iron core laminated portion for laminating the punched unit iron core is separately provided, and a nozzle having a needle for applying a paste adhesive on the surface of the unit iron core in a dotted or linear manner is installed. Thus, the laminated unit cores can be integrated. As for the nozzle, the coating can be performed independently before the unit cores are stacked, or can be installed alone or in the punching section. It is also possible to provide a punching section having a male punching die and a female punching die.

  Further, when the unit iron core is firmly fixed, it is possible to provide a pressurizing mechanism in the unit iron core laminated portion. As a pressurizing mechanism, a press punch or a press punch can be used as a male die of a punching die. Furthermore, in addition to the above pressurization, it is also possible to provide a heating mechanism in the unit core laminated portion. As described above, the heating mechanism can be energized heating, induction heating, dielectric heating, electromagnetic wave irradiation, direct contact heating, and the like.

  FIG. 1 shows an embodiment of the present invention. When unit iron cores punched into a predetermined motor core shape from a non-oriented electrical steel sheet hoop are laminated one by one, the surface of the iron core is thermoset. The cross-sectional explanatory drawing of the state which has laminated | stacked after apply | coating a paste-form adhesive, and has adhered by heating-pressing is shown.

  In the figure, 1 is a unit iron core that is punched from a magnetic steel sheet and is held by only one sheet, 2 is a magazine that holds unit iron cores, 3 is a unit iron core that is held in a laminated state, and 4 is a unit iron core. Adsorption arm for adsorbing and holding, 5 is a slide rail for moving the unit iron core, 6 is an adhesive dispenser, 7 is a syringe filled with a paste-like adhesive, 8 is an adhesive nozzle with a needle attached, and 9 is an adhesive 10 is a magazine that holds unit iron cores coated with an adhesive in a stacked state, 11 is a unit iron core in a stacked state, 12 is a slide rail that moves the unit iron core in a stacked state together with the magazine, 13 Is a stopper for the laminated iron core, 14 is a pressure cradle for lifting the laminated iron core on the pressure stage, 15 is an upper pressure cylinder, 16 is a heating device, and 17 is a pressure cylinder that presses the heating device against the iron core. In it, these are placed on the cradle 18.

  The unit iron core 1 is arranged for each direction in which the unit iron cores 1 are stacked when the unit iron core 1 is put into the magazine 2. The suction arm 4 takes out the unit iron cores 1 from the upper part of the magazine 2 one by one, moves on the slide rail 5, and transfers the unit iron cores to just above the nozzles 8. While the suction arm 4 is lowered, a paste-like adhesive filled in the syringe 7 by compressed air is sent from the adhesive dispenser 6 to the nozzle 8 and is discharged from the tip of the needle 9 by a predetermined amount. 1 is applied to the back surface. After application, the suction arm 4 rises, and further stops on the magazine 10 and descends, and then the unit iron core 1 is inserted into the magazine 10.

  When the predetermined number of unit iron cores are laminated, the magazine 10 moves on the guide rail 12 and presses the laminated iron core 11 against the stopper 13 to stop. The pressure cradle 14 evacuated downward is raised to lift only the laminated iron core 11 to the heating stage. From above, the upper pressurizing cylinder 15 is lowered to pressurize to a predetermined pressure, and the heating device 16 is pressed from the side against the pressurizing cylinder 17 against the laminated iron core, and the laminated iron core is heated to a predetermined temperature. Is fixed.

FIG. 2 shows another embodiment of the present invention. When a magnetic steel sheet hoop 19 is punched into a unit iron core shape of a motor core and the punched steel sheets are laminated to form a laminated iron core, a paste is formed on the surface of the iron core. After apply | coating an adhesive agent, the cross-sectional explanatory drawing of the state fixed by heating and pressurizing, sticking the next iron core is shown.
In the figure, 19 is a magnetic steel sheet (supply member), 20 is a male die for punching a guide hole when a unit iron core is punched from the supply member 19, and 21 is a female die for punching a guide hole provided facing the die 20. , 22 is a male die of an inner peripheral punching die, 23 is a female die for inner peripheral punching corresponding to the die 22, 24 is a male die of a first stage outer peripheral punching die, and 25 is a die 24. A first-stage outer peripheral punching die female die 35 and a die stand 35 are provided to face each other. Reference numeral 29 denotes a male die for punching the outer periphery of the unit iron core, which also serves as a pressure punch. Reference numeral 30 denotes a spring for adjusting the reduction force of the pressure punch. 31 shows a state in which the punched unit iron cores are stacked. 32 is a female die for outer peripheral perforation provided opposite to the male die and pressure punch 29. Reference numeral 33 denotes a heating device that heats the laminated iron core 31 from the side surface, and is separated from the mold base 35 by a heat insulating member 34. Together with these and the male die combined pressure punch, a laminated portion is formed.
The adhesive supply device includes a dispenser 26, a nozzle 27, and a syringe 28 filled with a paste-like adhesive. By these, paste adhesive is discharged and applied to the back surface of the steel plate.

  The electromagnetic steel sheet 19 in a coiled state is continuously fed into the apparatus of the present invention by a feeding device as a supply member. After the guide holes are provided by the guide hole punching dies 20 and 21, the inner peripheral side is punched by the male dies 22 and the female dies 23 of the punching dies. Next, the outer peripheral portion of a predetermined part is punched out by the male die 24 and the female die 25 of the first stage outer peripheral punching die. When punching, the paste-like adhesive filled in the syringe 28 is discharged from the nozzle 27 by the air compressed from the dispenser 26, and the paste-like adhesive adheres to the surface of the unit iron core while the needle is not in contact. The unit iron core moves with the feeding of the supply member, and then the steel plate 21 is completely punched into the unit iron core by the male die 29 and the female die 32 of the second-stage outer peripheral punching die that also serves as a pressure punch. Push the iron core and laminate. The laminated iron core 31 is heated from the side surface by the heating device 33 and is heated to a temperature of 140 ° C. at which the thermosetting paste adhesive is cured, and the laminated iron core is fixed.

The figure which shows the state which apply | coated and laminated | stacked the solvent-free paste-form adhesive on the steel plate surface for every unit iron core which punched the electromagnetic steel plate in the predetermined shape one by one, and heat-pressed. A hoop-shaped non-oriented electrical steel sheet is continuously punched into a unit iron core with a punching die, and a solvent-free paste adhesive is applied to the steel sheet surface for each unit iron core and heated under pressure in the laminated part. FIG. It is a figure which shows the unit iron core of the state which apply | coated the paste-form adhesive using the apparatus of FIG. 1, and shows the state which apply | coated the adhesive agent to the teeth part and the core back part. It is a figure which shows the lamination | stacking iron core of the state which apply | coated the paste-form adhesive using the different nozzle with the apparatus of FIG. 1, and shows the state which applied the very small amount of paste-form adhesives. It is a figure which shows the laminated iron core of the state which sprayed and apply | coated the paste-form adhesive using the apparatus of FIG. 2, and shows the state apply | coated linearly by arranging a plurality of needles.

Explanation of symbols

1: Unit iron core 2: Magazine 3: Stacked unit iron core 4: Adsorption arm 5: Slide rail 6: Dispenser 7: Syringe 8: Nozzle 9: Needle 10: Magazine 11: Laminated iron core 12: Slide rail 13: Stopper 14: Pressure receiving base 15: Upper pressure cylinder 16: Heating device 17: Pressure cylinder 18: Receiving base 19: Hoop-shaped electromagnetic steel plate 20: Male guide hole punching die 21: Guide hole punching die Female die 22: Male die of inner peripheral punching die 23: Female die of inner peripheral punching die 24: Male die of first stage outer peripheral punching die 25: Female die of first stage outer peripheral punching die 26: Dispenser 27 : Nozzle 28: Syringe 29: Pressure punch for second stage outer peripheral punching die 30: Spring for pressure punch 31: Laminated iron core 32: Female die for second stage outer peripheral punching die 33: Heating device 3 : Heat insulating member 35: mold table

Claims (13)

In a manufacturing method of a laminated iron core, in which a laminated iron core is integrated by punching a magnetic steel sheet into a predetermined shape, forming a unit iron core, laminating and fixing the punched unit iron core, the unit A method for producing a laminated iron core, comprising applying a paste adhesive on a surface of the iron core in a dotted or linear manner and then applying pressure. The method for producing a laminated iron core according to claim 1, wherein the viscosity of the paste adhesive is 0.1 to 1000 Pa · s. 3. The laminated iron core according to claim 1, wherein the unit iron core is applied in a non-contact manner by discharging a paste-like adhesive in a droplet form from a nozzle of an applicator on the front surface, the back surface or both surfaces thereof. Manufacturing method. It is characterized by applying a paste-like thermosetting resin adhesive to the surface of the laminated iron core during the lamination of the unit iron core, heating the laminated iron core to a predetermined temperature, and pressurizing it to integrate the laminated iron core. The manufacturing method of the laminated iron core of any one of Claim 1 thru | or 3. During or immediately after punching, paste-type thermosetting resin adhesive is applied to the surface of the unit iron core, the unit iron core with the paste-type thermosetting adhesive attached is laminated, and the laminated iron core is heated to a predetermined temperature. The method for producing a laminated iron core according to any one of claims 1 to 4, wherein the laminated iron core is integrated by applying pressure. 6. Lamination according to any one of claims 1 to 5, characterized in that it has two or more unit iron core laminations, and is continuously stamped and laminated by replacing the laminations immediately after a predetermined number of laminations. Manufacturing method of iron core. A magazine section for storing the punched unit iron core, a holding section for holding each unit core, and applying a paste-like adhesive in the form of dots or lines on the front, back or both sides of the held unit iron core An apparatus for producing a laminated iron core, comprising: a coating part for laminating and a laminated part for laminating unit iron cores after application of an adhesive. A punching portion having a male punching die and a female punching die is provided, and a unit iron core laminated portion for laminating the punched unit iron core is provided separately, and a paste-like adhesive is provided on the unit iron core. An apparatus for manufacturing a laminated iron core, comprising an adhesive supply unit that applies a dotted or linear shape to a steel sheet surface. The apparatus for producing a laminated iron core according to claim 7 or 8, wherein the unit iron core laminated part is provided with a pressurizing mechanism. The apparatus for producing a laminated iron core according to any one of claims 7 to 9, wherein the unit iron core laminated portion includes a pressurizing and heating mechanism. 11. The adhesive supply unit for applying the paste adhesive includes a needle and a dispenser unit, and discharges the adhesive using air pressure to control the application amount. The manufacturing apparatus of the laminated iron core of description. The adhesive supply unit for applying the paste adhesive includes a needle and a dispenser unit, and discharges the adhesive using air pressure to control the application amount and apply the non-contact to the iron core surface. The laminated iron core manufacturing apparatus according to any one of 7 to 11. 8. Two or more unit iron core lamination parts are provided, and the punching and fixing are performed continuously by providing an exchange device for exchanging the lamination parts immediately after a predetermined number of sheets are laminated and a unit iron core discharge device. The laminated iron core manufacturing apparatus according to any one of 12.

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