JP3749478B2 - Manufacturing method of laminated core - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a laminated core of a rotating electric machine such as a motor, and more particularly to improvement in accuracy and productivity of the laminated core.
[0002]
[Prior art]
In recent years, with the aim of increasing the efficiency of motors, magnetic steel sheets applied to laminated cores have been made thinner. On the other hand, the electromagnetic steel sheet is manufactured by cold rolling. As shown in FIG. 11, the rolling roll 1 is elastically deformed, so that there is a difference in the thickness between the rolling direction (indicated by arrows in the figure) and the both end portions in the perpendicular direction. As shown in FIG. 12, the difference between the plate thicknesses is extremely small at the central portion of the electromagnetic steel sheet 2, but becomes extremely large near both ends.
Therefore, in the laminated core that is laminated by punching the electromagnetic steel strip 2a with a large difference in the plate thickness, the number of stacked sheets increases due to the thinning as described above, and the accumulation of the plate thickness difference is increased. Since it becomes more conspicuous, the core accuracy is deteriorated, which is a cause of generation of cogging torque, noise, vibration and the like.
[0003]
Therefore, although not shown, for example, in Japanese Patent Application Laid-Open No. 9-216020, etc., two types of units whose shape directions are forward and reverse in the width direction are punched, and at the time of this punching, every predetermined number of units are punched. In addition, it is disclosed that by rotating the die of the mold 180 degrees, the orientations of the two types of units are aligned in the same direction to cancel the difference in plate thickness, thereby improving the core accuracy.
[0004]
[Problems to be solved by the invention]
As described above, the conventional laminated core has the same thickness direction by rotating the die of the two types of units punched in the opposite direction of the shape, and rotating the die of the mold 180 degrees. However, the core accuracy can be improved, but the mechanism for rotating the die die by 180 degrees becomes complicated, and the press speed decreases with the rotation of 180 degrees. As a result, there is a problem that productivity is deteriorated.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a laminated core capable of easily improving productivity.
[0006]
[Means for Solving the Problems]
In the laminated core manufacturing method according to claim 1 of the present invention, a steel plate having a predetermined nominal thickness and different thicknesses at both ends in a direction perpendicular to the rolling direction is used as a progressive press die. The process of supplying in a state where two sheets are stacked so that the end portions on the side and the small side are adjacent to each other, and two sheets of steel sheets supplied in a stacked manner are simultaneously punched to form a desired shape, and the rolling direction is matched. And sequentially stacking the layers.
[0007]
Moreover, the manufacturing method of the laminated core which concerns on Claim 2 of this invention WHEREIN: The thickness of the both ends of the rolling direction of the steel plate which overlaps 2 sheets at a time and the orthogonal direction in Claim 1 is each on the large side and small side, respectively. It is equal.
[0008]
According to a third aspect of the present invention, there is provided a method for manufacturing a laminated core according to the first or second aspect, wherein a film-like insulating member is sandwiched between two overlapping steel sheets.
[0009]
According to a fourth aspect of the present invention, there is provided a method for manufacturing a laminated core according to the first or second aspect, wherein an adhesive layer is interposed between two steel plates that are overlapped each other.
[0010]
According to a fifth aspect of the present invention, there is provided a laminated core manufacturing method according to the fourth aspect, wherein the adhesive layer is formed of a double-sided tape.
[0011]
According to a sixth aspect of the present invention, there is provided a method for manufacturing a laminated core according to the first or second aspect, wherein any one of the two overlapping steel sheets is a steel sheet coated with an adhesive film.
[0012]
According to a seventh aspect of the present invention, there is provided a method for producing a laminated core according to the first aspect, wherein the width dimension in the direction perpendicular to the rolling direction of the steel sheets supplied in a stacked manner is different, and the width dimensions of both steel sheets are large. In addition to fixing both ends in the width direction on the side, the pilot holes are formed in the regions left at both ends in the width direction.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 shows a configuration of a laminated core according to Embodiment 1 of the present invention, (A) is a plan view, (B) is a side view, and FIG. 2 is a side view showing a configuration of a main part of the laminated core in FIG. FIG. 3 is a side view showing a manufacturing process of the laminated core in FIG.
[0014]
In the figure, 3 and 4 have predetermined nominal thicknesses, and two types of electromagnetic steel plates 5 and 6 having different thicknesses at both ends in the width direction perpendicular to the rolling direction are shown in FIG. 1 is a core member formed in a predetermined shape as shown in FIG. 1 by stacking so that the end portions on the small side are adjacent to each other and punching two pieces at a time. Lamination cores 7 are configured by sequentially laminating so that the rolling directions (indicated by arrows in the figure) coincide.
[0015]
The laminated core 7 according to the first embodiment configured as described above has two types of electromagnetic steel plates 5 and 6 wound around the drums 8 and 9 as shown in FIG. Are fed to the progressive press die 10 in a state where two end portions are adjacent to each other, and in the progressive press die 10, the two electromagnetic steel plates 5 and 6 fed in duplicate are fed simultaneously. The two core members 3 and 4 are formed by stamping and forming into a desired shape, and are completed by sequentially laminating so that the rolling directions coincide.
[0016]
As described above, according to the first embodiment, two types of electromagnetic steel plates 5 and 6 having a predetermined nominal thickness and different plate thicknesses at both ends in the width direction are connected to the end on the side where the thickness deviation is large and the side where the plate thickness deviation is small. The core members 3 and 4 are formed by forming two or more pieces so as to be adjacent to each other and simultaneously punching each other to form the core members 3 and 4, and sequentially laminating so that the rolling directions coincide with each other. Since it is configured, it is possible to cancel the difference in plate thickness without using a complicated mechanism such as rotating the die, and the productivity can be improved by increasing the press speed.
[0017]
In addition, if the thickness of both the electromagnetic steel plates 5 and 6 is 0.2 mm or less, that is, particularly when applied to a thin plate in which the number of stacked sheets increases, the difference between the thicknesses becomes more remarkable. The plate thickness and the plate thickness at the end in the width direction are equal to each other on the large side and the small side, that is, by using the same material, the difference in the plate thickness can be more easily offset and the performance can be improved. .
[0018]
Embodiment 2. FIG.
FIG. 4 is a side view showing the configuration of the laminated core according to Embodiment 2 of the present invention, and FIG. 5 is a side view showing the manufacturing process of the laminated core in FIG.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Reference numeral 11 denotes a film-like insulating member that is sandwiched between the core members 3 and 4 that are punched at the same time, and has a thickness of about 1/10 of the thickness of the core members 3 and 4. 4 are sequentially laminated so that the rolling direction is coincident with each other, thereby forming a laminated core 12.
[0019]
The laminated core 12 in the second embodiment configured as described above has two types of electromagnetic steel plates 5 and 6 wound around the drums 8 and 9 as shown in FIG. In a state where the film-like insulating member 11 is sandwiched, two sheets are stacked so that the end portions on the thick side and the small side are adjacent to each other and fed to the progressive press 10, and the progressive press die 10, the two steel sheets 5 and 6 supplied in a stacked manner are simultaneously punched and formed into a desired shape to form both core members 3 and 4, so that the rolling directions coincide with each other. It is completed by sequentially laminating.
[0020]
As described above, according to the second embodiment, two types of electromagnetic steel plates 5 and 6 having a predetermined nominal thickness and different thicknesses at both ends in the width direction are sandwiched with the film-like insulating member 11 therebetween. In this state, the core members 3 and 4 are formed by forming two or more pieces at the same time by stamping and processing them so that the end portions on the large side and the small side are adjacent to each other. Since the laminated core 12 is configured by sequentially laminating so as to coincide with each other, as in the first embodiment, the difference in sheet thickness can be obtained without using a complicated mechanism such as rotating a die die. It is possible to cancel out, and it is possible to improve the productivity by improving the eddy current prevention effect as well as improving the productivity by increasing the press speed.
[0021]
Embodiment 3 FIG.
6 is a side view showing the configuration of the laminated core according to Embodiment 3 of the present invention, and FIG. 7 is a side view showing the manufacturing process of the laminated core in FIG.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Reference numeral 14 denotes an adhesive layer interposed between the core members 3 and 4 that are punched two by two at a time. The adhesive layers are sequentially laminated together with the core members 3 and 4 so that the rolling directions coincide with each other. ing.
[0022]
The laminated core 15 in the third embodiment configured as described above is one of the two types of electromagnetic steel plates 5 and 6 wound around the drums 8 and 9 as shown in FIG. For example, a thermosetting resin 17 is sprayed on the surface of the coating 6 from the coating nozzle 16, and the surface is sandwiched between the other electromagnetic steel plates 5. Then, the adhesive layer 14 in which the thermosetting resin 17 is cured is formed between the electromagnetic steel plates 5 and 6 by heating.
[0023]
Then, the two electromagnetic steel plates 5 and 6 fixedly integrated through the adhesive layer 14 are supplied to the progressive press 10, in which two sheets are simultaneously punched and formed into a desired shape, and both cores are formed. The members 3 and 4 are formed with the adhesive layer 14 interposed therebetween, and are completed by sequentially laminating so that the rolling directions coincide.
[0024]
As described above, according to the third embodiment, the two magnetic steel sheets 5 and 6 fixedly integrated through the adhesive layer 14 are formed into a desired shape by punching two sheets at a time, and both core members are formed. 3 and 4 are formed, and the laminated core 15 is formed by sequentially laminating so that the rolling directions coincide with each other. Therefore, as in each of the first and second embodiments, improvement in productivity and performance are achieved. As a matter of course, since the punching process is performed in a state in which both the electromagnetic steel plates 5 and 6 are fixedly integrated with the adhesive layer 14, the electromagnetic steel plates 5 and 6 are prevented from being displaced. And the performance can be further improved.
[0025]
In the above configuration, the adhesive layer 14 is formed by the thermosetting resin 17 applied to the surface of one of the electromagnetic steel plates 6, but for example, a double-sided tape having an adhesive layer on both surfaces is used for both the electromagnetic steel plates 5 and 6. If it is interposed, the formation of the adhesive layer is further facilitated, and the productivity can be further improved.
[0026]
Embodiment 4 FIG.
FIG. 8 is a side view showing the manufacturing process of the laminated core according to Embodiment 4 of the present invention.
The laminated core in the fourth embodiment is obtained by stacking the electromagnetic steel sheet 5 and the adhesive electromagnetic steel sheet 19 having an adhesive layer on the surface, and pressing and heating from the outside of the electromagnetic steel sheets 5 and 19 in the pressurizing and heating means 18. And then fed to the progressive press 10 and formed into a desired shape by the progressive press 10 to form both core members (not shown) and completed by sequentially laminating so that the rolling directions coincide. Is done.
[0027]
As described above, according to the fourth embodiment, either one of the electromagnetic steel sheets is the bonded electromagnetic steel sheet 19, and both the electromagnetic steel sheets 5 and 19 are heated and pressed by the pressurizing means 18 to be heated and integrated. Since punching is performed in the progressive press 10, it is possible to prevent the electromagnetic steel plates 5 and 19 from shifting as in the third embodiment, and to further improve the performance. .
[0028]
Embodiment 5. FIG.
FIG. 9 is a side view showing the manufacturing process of the laminated core according to Embodiment 5 of the present invention, and FIG. 10 is a plan view for explaining a method of stacking both electromagnetic steel sheets.
As shown in FIG. 10, the laminated core in the fifth embodiment includes two electromagnetic steel plates 20 and 21 having different widthwise dimensions, and regions 20 a and 20 a at both ends in the widthwise direction of the electromagnetic steel plate 20 having a larger widthwise dimension. 20b is left and stacked, for example, welding 23 is applied by laser welding means 22, and fixed and integrated. In the progressive die 10, pilot holes 24 for progressive feeding are left in the regions 20a and 20b left at both ends in the width direction of the electromagnetic steel sheet 20. This is punched out with reference to the pilot hole 24, formed into a desired shape to form both core members (not shown), and completed by sequentially laminating so that the rolling directions match. To do.
[0029]
As described above, according to the fifth embodiment, two electromagnetic steel plates 20 and 21 having different widthwise dimensions are stacked, leaving the regions 20a and 20b at both ends of the electromagnetic steel plate 20 having a larger widthwise dimension, The welding 2 is fixed and integrated, and the pilot holes 24 for progressive feeding are formed in both regions 20a and 20b, that is, one of the electromagnetic steel sheets 20, and punching is performed to form a desired shape. The electromagnetic steel sheets 20 and 21 can be prevented from shifting, and the performance can be further improved.
[0030]
In each of the first to fifth embodiments described above, the case of an integral core has been described. However, the present invention is not limited to this, and although not illustrated, it may be applied to a case of a split core, and may be bent. Even when a core member composed of a plurality of core pieces connected through possible connecting portions is applied to a core formed by forming the connecting portion into an annular shape by bending the connecting portions, the same effects as described above can be obtained. Needless to say, you can.
[0031]
【The invention's effect】
As described above, according to the first aspect of the present invention, a steel plate having a predetermined nominal thickness and different thicknesses at both ends in the direction perpendicular to the rolling direction is used as the progressive press die. The process of supplying in a state where two sheets are stacked so that the end portions on the side and the small side are adjacent to each other, and two sheets of steel sheets supplied in a stacked manner are simultaneously punched to form a desired shape, and the rolling direction is matched. And the step of sequentially stacking the layers, it is possible to provide a method of manufacturing a stacked core capable of improving productivity.
[0032]
According to claim 2 of the present invention, in claim 1, since the thicknesses of both end portions in the direction perpendicular to the rolling direction of the steel sheets that overlap each other are made equal on the large side and the small side, respectively, The manufacturing method of the lamination | stacking core which can aim at improvement of can be provided.
[0033]
According to the third aspect of the present invention, in the first or second aspect, the film-like insulating member is sandwiched between the steel plates that are overlapped two by two, so that the performance can be improved. A method for manufacturing a laminated core can be provided.
[0034]
According to the fourth aspect of the present invention, in the first or second aspect, since the adhesive layer is interposed between the steel sheets that are overlapped two by two, it is possible to improve the performance of the laminated core. A manufacturing method can be provided.
[0035]
According to the fifth aspect of the present invention, since the adhesive layer is formed of the double-sided tape in the fourth aspect, it is possible to provide a method for manufacturing a laminated core capable of easily improving the performance.
[0036]
According to the sixth aspect of the present invention, in any one of the first and second aspects, either one of the two overlapping steel sheets is a steel sheet coated with an adhesive film, so that the performance can be easily improved. Possible laminated cores can be provided.
[0037]
According to claim 7 of the present invention, in claim 1, the width dimension in the direction perpendicular to the rolling direction of the steel sheets supplied in a stack of two sheets is made different, and both widths of both steel sheets in the width direction on the side where the width dimension is larger. Since the pilot holes are formed in the regions left at both ends in the width direction, the laminated core manufacturing method capable of improving the performance can be provided.
[Brief description of the drawings]
1A and 1B show a configuration of a laminated core according to Embodiment 1 of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a side view.
2 is a side view showing a configuration of a main part of the laminated core in FIG. 1. FIG.
3 is a side view showing a manufacturing process of the laminated core in FIG. 1. FIG.
FIG. 4 is a side view showing a configuration of a laminated core according to Embodiment 2 of the present invention.
5 is a side view showing a manufacturing process of the laminated core in FIG. 4; FIG.
FIG. 6 is a side view showing a configuration of a laminated core according to Embodiment 3 of the present invention.
7 is a side view showing a manufacturing process of the laminated core in FIG. 6. FIG.
FIG. 8 is a side view showing a manufacturing process of a laminated core in Embodiment 4 of the present invention.
FIG. 9 is a side view showing the manufacturing process for the laminated core in the fifth embodiment of the present invention.
FIG. 10 is a plan view for explaining a method of stacking both electromagnetic steel sheets.
FIG. 11 is a perspective view showing a rolled state of a general steel strip.
12 is a cross-sectional view showing a cross section of the steel strip rolled in FIG. 11. FIG.
[Explanation of symbols]
3, 4 core member, 5, 6, 20, 21 electrical steel sheet, 20a, 20b region,
7, 12, 15 laminated core, 10 progressive press mold, 11 film-like insulating member,
14 Adhesive layer, 17 Thermosetting resin, 19 Adhesive electrical steel sheet, 24 Pilot holes.

Claims (7)

A steel plate having a predetermined nominal thickness and different thicknesses at both ends in the direction perpendicular to the rolling direction is placed on the progressive press die so that the end portions on the large and small sides are adjacent to each other. Including a step of supplying two sheets in a stacked state, and a step of simultaneously punching the two sheets of steel sheets supplied in a stacked manner to perform desired forming, and sequentially laminating the rolling directions so as to coincide with each other. A method for producing a laminated core characterized by the above. The method for producing a laminated core according to claim 1, wherein the thicknesses of both end portions in the direction perpendicular to the rolling direction of the steel sheets that overlap each other are equal on the large side and on the small side, respectively. The method for producing a laminated core according to claim 1 or 2, wherein a film-like insulating member is sandwiched between two steel plates that are overlapped each other. The method for producing a laminated core according to claim 1, wherein an adhesive layer is interposed between the steel plates that are overlapped two by two. The method for manufacturing a laminated core according to claim 4, wherein the adhesive layer is a double-sided tape. 3. The method for manufacturing a laminated core according to claim 1, wherein any one of the two steel plates that overlap each other is a steel plate coated with an adhesive film. The two steel sheets supplied in a stacked manner have different width dimensions in the direction perpendicular to the rolling direction, and both the steel sheets are fixed together, leaving both ends in the width direction on the side where the width dimension is larger, and remain at both ends in the width direction. The method for manufacturing a laminated core according to claim 1, wherein pilot holes are formed in the formed region.

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