JP4008170B2 - Iron core manufacturing method and apparatus suitable for the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method and manufacturing apparatus of a laminated iron core excellent in workability such as motors and transformers.
[0002]
[Prior art]
Conventionally, as a method of manufacturing laminated iron cores such as motors and transformers using electromagnetic steel sheets, steel sheets are punched into unit iron cores, and a predetermined number of unit iron cores are laminated and then bolted, caulked, welded or bonded. It is common to fix using means such as. After being fixed, the laminated iron core is subjected to processing such as incorporation of a winding coil, and the iron core of the transformer or motor is assembled.
[0003]
If the laminated iron core is weakly bonded, if the unit iron core is unwound or a gap is opened, the efficiency of coil winding work will be reduced, and in the case of a motor, it may cause noise and vibration. It is necessary to stick firmly.
[0004]
By the way, when fixing by bolting, it is necessary to provide a through hole through which the bolt passes in the laminated iron core, and when a through hole is provided in the laminated iron core, the magnetic properties of the laminated iron core deteriorate. Similarly, when the laminated iron core is fixed by welding, the magnetic properties of the laminated iron core may deteriorate due to thermal distortion in the welded portion.
[0005]
In addition, when a laminated iron core is fixed using an adhesive or varnish, the adhesive or varnish is infiltrated between the steel plates using a capillary phenomenon and then fixed by heating or the like. There is a problem that the agent and varnish do not penetrate the entire surface of the steel sheet and only the edge of the steel sheet is fixed.
[0006]
Therefore, at present, fixing by caulking, which can fix a laminated iron core at the same time as punching, is common. However, it is difficult to firmly fix with caulking, the laminated iron core may be displaced during assembly of the transformer, and the magnetic characteristics may be deteriorated due to caulking.
[0007]
By the way, when the laminated iron core is fixed by punching, laminating, and heating and pressing a steel sheet with a pre-adhesive insulating coating, that is, a so-called adhesive coating, the magnetic properties found in welding etc. Since there is no deterioration and the bonding force between the steel plates is large, a firmly fixed iron core can be obtained.
However, when a laminated iron core is fixed using a magnetic steel sheet having a conventional adhesive coating, it has been necessary to press in a heating furnace in order to heat and press, so that the fixing work takes a long time and workability is improved. There was a problem that was inferior.
[0008]
In order to solve such problems, Japanese Patent Application Laid-Open No. 11-147141 discloses a method of fixing work by using an apparatus capable of simultaneously pressing and heating when punching a magnetic steel sheet with an adhesive coating. A method for dramatically improving workability is disclosed. This is to provide a unit iron core laminated portion below the punching die of the punching processing device, raise the temperature by the heating device, and integrate the laminated iron core by pressurizing with the male punching die, When an electromagnetic steel sheet having adhesive ability is fixed by heating and pressing, productivity is greatly improved.
[0009]
[Problems to be solved by the invention]
However, this method has a problem in that the punching die and the iron core are stacked and heated in the vertical direction, so that a large press device with a long stroke is required and cannot be used with a press device with a short stroke. . Moreover, there has been a problem that it becomes difficult to ensure the punching accuracy as the thickness of the steel sheet used becomes thinner.
[0010]
The present invention provides a method and apparatus for solving such problems in an apparatus in which such a punching apparatus and a laminated iron core fixing apparatus are integrated, and obtaining a laminated iron core with good workability.
[0011]
[Means for Solving the Problems]
That is, the gist of the present invention is as follows.
(1) An electromagnetic steel sheet, which has an insulating coating that exhibits adhesion by heating and pressing on the surface, is fed into a mold and punched into a predetermined shape, and bonded by heating and pressing. In this process, 1) divided into two or more stages, punched into a unit iron core shape in which the supply member and the unit iron core are partially connected, and 2) the same supply member subjected to the punching process. It conveys to the upper part of the unit iron core lamination part set up separately on the mold stand, and 3) cuts the part connected to the supply member and at the same time incorporates the unit iron core and the spring whose pressure is adjusted. The final punching die is pressed with a male pressure punch, and 4) The final punching die is built in with a spring that is heated to 200 ° C by a heating device installed adjacent to the stacking part while adjusting the pressure. Male combined use Method for manufacturing a laminated iron core, characterized in that to integrate by pressing by the punch.
(2) The method for producing a laminated iron core according to (1), wherein the laminated iron core has two or more unit iron core laminated portions, and is continuously punched and fixed by replacing the laminated portions immediately after the predetermined number of layers are laminated.
(3) Before the unit iron core is finally separated from the supply member, the supply member and the unit iron core are connected at the notch provided on the outer peripheral side of the unit iron core and separated at the laminated portion. The manufacturing method of the laminated iron core as described in said (1) or (2).
(4) The method for producing a laminated iron core according to (1), (2), or (3), wherein a side pressure is applied to the iron core from a direction perpendicular to the laminating direction when the unit iron cores are laminated .
[0012]
(5) Two or more punching sections having a male punching die and a female punching die for punching in a state where the unit iron core is partially connected to the supply member are transported. A final punching die combined pressure punch with a built-in spring for adjusting the pressing force for punching the unit iron core from the supply member, a laminated iron core pedestal for laminating the punched unit iron core, and heating the laminated iron core 200 Demonstrates adhesiveness by heating and pressurizing a unit iron core laminated part having a heating device heated to ℃ on the same mold base through a heat insulating member The manufacturing apparatus of the electromagnetic steel plate laminated iron core with which the insulating film to be given is given .
(6) The apparatus for producing a laminated iron core according to (5), further comprising a damper mechanism that applies a side pressure to the iron core laminated on the unit iron core laminated portion.
(7) The above (5) or (6) is characterized in that it comprises two or more unit iron core lamination parts, and 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 manufacturing apparatus of the laminated iron core of description .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific modes for carrying out the present invention will be described.
In the present invention, the surface of the electromagnetic steel sheet used for the iron core needs to have an insulating coating that exhibits adhesive ability by heating and pressurization, a so-called adhesive coating. The adhesive coating does not necessarily have to be applied to both surfaces of the steel sheet, and may be only one surface or a partial surface as long as sufficient adhesiveness is maintained. Further, the electromagnetic steel sheet used for the laminated iron core may be a non-oriented electrical steel sheet or a directional electrical steel sheet, and a general steel sheet may be used as the electromagnetic steel sheet. Further, a high Si material, an amorphous alloy, or the like can be used, and is particularly suitable for use of a thin steel plate having a plate thickness of 0.10 to 0.35 mm, but can be applied to a normal plate thickness.
[0014]
As an insulating film that exhibits adhesive ability, for example, those having organic resin such as epoxy resin, acrylic resin, and phenol resin as a main component are generally used, but are not particularly limited as long as they exhibit adhesive ability. Absent.
[0015]
In the present invention, the processing of the unit iron core requires a plurality of male / female punching dies for punching the unit iron core. When punching into the unit iron core shape, the punching is performed in two or more stages. After this punched part is processed into a unit iron core shape in which the electromagnetic steel sheet (supply member) and the unit iron core are partially connected, it is sequentially fed out in a connected state without being disconnected from the supply member, and above the laminated part Is finally punched into the unit iron core when it is conveyed and laminated in the iron core laminate.
[0016]
That is, a steel sheet that has been slit in advance into a coil with a predetermined width is fed continuously or intermittently into a punching die, and is not completely punched at the punching part when punching into a unit iron core. After the unit iron core formed on the outer part and the unit iron core are partially connected, they are transported to the laminated part, and after that, the connected part is cut off at the laminated part and finally separated into unit iron cores. The iron core is fixed by laminating and heating and pressing.
[0017]
In the present invention, as shown in FIG. 1, the punching die and the laminated part can be arranged in parallel with the supply member. In the technique disclosed in Japanese Patent Application Laid-Open No. 11-147141, the press used While a long stroke is required for the apparatus, a press apparatus with a short stroke can be used sufficiently. In addition, since it is not completely cut into the unit iron core shape, when transporting from the punched part to the laminated part, the unit iron core is surely conveyed to the laminated part without detaching from the supply member or being displaced. Is possible.
[0018]
After that, after the predetermined number of unit iron cores are laminated or during lamination, the laminated iron core is heated to a predetermined temperature by a heating device installed adjacent to the laminated portion. At this time, the end surfaces of the laminated iron cores are aligned from the side surfaces of the laminated unit iron cores or in the middle of the lamination using a side pressure device provided with a damper mechanism.
[0019]
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 alternately arranged immediately after the punched portions.
After completion of lamination or whenever a unit iron core is supplied, pressurization is performed with a pressure device to develop the adhesive film adhesion ability, and the laminated unit iron cores are bonded in whole or in part to secure the iron core. It is something to be made.
In addition, the arrangement of the laminated parts is not limited to the method of moving in the direction perpendicular to the feeding direction of the steel plate as shown in FIG. 2, 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. Also good.
[0020]
As the heating means, electric heating, induction heating, dielectric heating, electromagnetic wave irradiation, direct contact heating, and the like can be used. In particular, the method of heating the unit cores laminated by contact heating by using a heater to heat the entire laminated part has an advantage that the apparatus is simple and the cost is low.
Furthermore, after the unit iron cores are stacked, when the unit iron core is moved from the position immediately after the punched portion, it can be pressurized again by the pressurizing device.
[0021]
In the present invention, by installing the heating device away from the punching die, it is possible to suppress thermal deformation of the punching die when heating the laminated iron core, and to ensure punching accuracy. Since the laminated end faces can be aligned from the lateral pressure device, it is possible to increase the stacking accuracy of the iron core.
[0022]
In a motor mold, a notch (connecting part) is provided where there is no influence on the magnetic properties or machining accuracy, such as on the outer periphery of the stator, and after punching into a unit iron core shape, the unit iron core is finally attached. By cutting the notch when cutting, it is possible to punch and stack more easily and accurately. Although it does not necessarily limit, the continuous part of the unit iron core and supply member at the time of conveying to a lamination | stacking part is about 3-10 points, and a width | variety should be about 0.5-2.0 mm, Furthermore, a supply member It is desirable to arrange them symmetrically with respect to the feed. Moreover, when dividing | segmenting a unit iron core later, a connection part may be arrange | positioned by division | segmentation unit iron cores.
[0023]
【Example】
[Example 1]
FIG. 1 is an embodiment of the present invention, and shows a cross-sectional explanatory view of a state in which a magnetic steel sheet 1 provided with an adhesive coating is punched, laminated, heated and pressed and fixed to a unit core shape of a motor core.
In the figure, 1 is a magnetic steel plate (supply member), 2 is a male die for inner peripheral punching when punching a unit core from the supply member 1, and 3 is a female die for inner peripheral punching provided opposite to the die 2. It is. In addition, 4 and 6 are outer punching male dies for stepwise punching of the outer periphery of the unit core partly leaving a connection part, and 5 and 7 are outer punching provided facing the male dies 4 and 6. Female molds, and these molds form a two-stage punched portion.
8 is a mold base, 9 is a final punching die male pressure punch incorporating a spring 10 for pressure punch, 11 is a laminated iron core, 12 is a lateral pressure plate provided on the side of the laminated iron core, and 13 is a lateral pressure. It is a pressure cylinder that laterally presses the laminated iron core through a pressure plate, the damper mechanism is composed of these 12 and 13, 14 is a heat insulating member, 15 is a laminated iron core cradle, and 16 is a heating device. A laminated part is constituted.
[0024]
The electromagnetic steel sheet 1 in a coiled state is fed as a supply member into the apparatus of the present invention by a feeding device. After the inner peripheral side of the unit iron core is punched from the supply member by the male die 2 and the female die 3 of the punching die, the outer peripheral side is almost stepwise by the male die 4 and 6 and the female die 5 and 7 of the punching die. Punched with iron core shape, that is, partially leaving the connection. The unit core is transported from the punched portion to the laminated portion in a state of being partially continuous with the supply member according to the feeding of the supply member 1.
[0025]
The unit iron core is completely separated from the supply member by the pressure punch 9 whose pressure is adjusted by the spring 10 and is laminated (laminated iron core 11) on the laminated iron core cradle 15 inside the laminating apparatus. Pressurized. Furthermore, this laminated iron core 11 is heated from the side by the heating device 16, and the temperature is raised to a temperature of 200 ° C. at which the adhesive coating exhibits adhesive ability. The laminated portion is thermally insulated from the mold table 8 by the heat insulating member 14. The laminating accuracy is ensured by pressing the pressure plate 12 for the side pressure against the laminated iron core and pressurizing from the side by the pressure cylinder 13 for the side pressure.
[0026]
[Example 2]
Another embodiment of the present invention will be described with reference to the plan view of FIG.
FIG. 2 shows an electromagnetic steel sheet (supply member) 17 having an adhesive coating substantially punched into a unit core shape of a motor core, transported in a state of being connected to the supply member, and the stacked state from the upper surface of the mold base. FIG.
In the figure, 18 is a female die for inner peripheral punching, 19 is a female die for first-stage outer peripheral punching die, 20 is a female die for second-stage outer peripheral punching die, 21 is a guide pin die, and 22 is a stacking unit moving table. , 23 is a rail for the stacking part moving table, 24 is a second stacking part, 25 is a first stacking part located directly under the punching press, and 26 is a connecting part.
[0027]
The electromagnetic steel sheet 17 in a coiled state is continuously fed into the apparatus of the present invention by a feeding device as a supply member. 19 and 20 are states in which the outer peripheral side is punched in stages by the punching die after the inner peripheral side is punched by the punching die 18. A pin is planted in the guide pin hole 21 to ensure feeding accuracy, and the punching portion of the supply member is maintained when punching.
[0028]
After being punched into a substantially unit iron core shape, it is transported up to the upper side of the first laminating unit 25 installed in the laminating unit in a state of being continuous with the supply member at the connecting unit 26. When being pushed into the first laminated portion 25 by the pressure punch, the unit iron core is completely separated from the supply member and simultaneously pressurized. After stacking a predetermined number of sheets, the stacking unit moving table 22 moves on the stacking unit moving table rail 23 installed in a direction perpendicular to the feeding direction of the supplying member, thereby moving the second stacking unit 24 in the traveling direction of the supplying member. Position the line and start stacking the unit cores. On the other hand, in the 1st lamination part 25 of the state which moved and hold | maintained the laminated iron core, after post-pressurizing to a laminated iron core, discharge means, such as a hole which provided this iron core in the lower part of the 1st laminated part 25 More discharge. Note that the stacking unit moving table 22 is heated to 200 ° C. by a heater.
[0029]
【The invention's effect】
As described above, according to the present invention, it is possible to fix the iron core continuously in the punching process of the laminated iron core, and since it is not fixed using a conventional heating furnace, it has an adhesive film in a short time. The magnetic steel sheet can be bonded, and even when the stroke of the press device is short, it can be used easily, and the workability of the laminated iron core fixing process is greatly improved.
[Brief description of the drawings]
FIG. 1 is an explanatory cross-sectional view showing a state in which a magnetic steel sheet having an adhesive coating in the method of the present invention is punched into a substantially unit iron core shape, transported in a state continuous with a supply member to a laminated portion, separated, and laminated.
FIG. 2 shows an electromagnetic steel sheet (supply member) having an adhesive coating in the method of the present invention, punched into a unit core shape in a state of being partially connected to the unit core, and conveyed to a laminated portion in a state of being continuous with the supply member. Plane explanatory drawing which looked down on the state which cuts and laminates from the upper part.
[Explanation of symbols]
1,17 Electrical steel sheet (supply member)
2 Male die of inner peripheral punching die 3 Female die of inner peripheral punching die 4, 6 Male die of outer peripheral punching die 5, 7 Female die of outer peripheral punching die 8 Mold base 9 Combined with final punching die male Pressure punch 10 Pressure punch spring 11 Laminated iron core 12 Side pressure press plate 13 Side pressure press cylinder 14 Thermal insulation member 15 Laminated iron core pedestal 16 Heating device 18 Inner peripheral punching die female die 19 First stage outer peripheral punching Female die 20 Second stage peripheral punching die Female die 21 Guide pin die 22 Laminating part moving base 23 Laying part moving base rail 24 Second laminating part 25 First laminating part 26 located directly under the punching press Connecting part

Claims (7)

In the process of supplying an electromagnetic steel sheet coated with an insulating film that exhibits adhesive ability by heating and pressurizing the surface into a die and punching it into a predetermined shape, and bonding it by heating and pressurizing 1) It is divided into two or more stages and punched into a unit iron core shape in which the supply member and the unit iron core are partially connected, and 2) the supply member subjected to the punching process is the same mold base It is transported to the upper part of the unit iron core laminated part that is installed separately , and 3) The final stamping die that incorporates a spring in which the unit iron core is laminated and the pressure is adjusted at the same time that the portion connected to the supply member is cut 4) Pressing with a pressure punch that also serves as a male die 4) Heating to 200 ° C with a heating device installed adjacent to the laminated part while laminating , and also serving as a final punching die male die with a built-in spring whose pressure is adjusted Pressure pan Method for manufacturing a laminated iron core, characterized in that to integrate by pressurizing by.   2. The method for producing a laminated iron core according to claim 1, wherein the laminated iron core has two or more unit iron core laminated portions, and is continuously stamped and fixed by replacing the laminated portions immediately after the predetermined number of layers are laminated. Before the unit iron core is finally separated from the supply member, the supply member and the unit iron core are connected at a notch provided on the outer peripheral side of the unit iron core, and separated at the laminated portion. Item 3. A method for producing a laminated iron core according to Item 1 or 2.   The method for manufacturing a laminated iron core according to claim 1, 2, or 3, wherein a side pressure is applied to the iron core from a direction perpendicular to the laminating direction when the unit iron cores are laminated. A punching section having a male punching die and a female punching die for punching in a state in which the unit iron core is partially connected to the supply member. Pressing punch for final punching die with built-in spring for adjusting the pressing force for punching unit iron core, laminated iron core holder for stacking the punched unit iron core, and heating up to 200 ° C for heating the laminated iron core Insulating coating that exhibits adhesive ability by heating and pressurizing on a surface characterized by comprising a unit iron core laminated part having a heated heating device separated on the same mold base through a heat insulating member The manufacturing equipment of the electromagnetic steel sheet laminated iron core to which is given .   6. The laminated iron core manufacturing apparatus according to claim 5, further comprising a damper mechanism that applies a side pressure to the iron core laminated on the unit iron core laminated portion.   The laminated iron core according to claim 5 or 6, further comprising two or more unit iron core laminated portions, and an exchange device for replacing the laminated portions immediately after a predetermined number of layers are laminated and a unit iron core discharging device. Manufacturing equipment.

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