JP6284850B2 - Method for producing amorphous iron core - Google Patents

Description

  The present invention relates to a method for manufacturing an amorphous iron core used for a transformer or the like.

  Amorphous alloys are used as low-loss core materials, and transformers using amorphous cores with laminated amorphous alloy ribbons have been commercialized.

  As shown in FIG. 10, the conventional amorphous iron core forming operation includes an inner core 3 arranged on the inner peripheral side of the iron core 1 and four side plates 2 and 8 arranged on the outer peripheral portion 4 of the iron core 1. It is a method of bolting with bolts 4 in the order of 4). The amorphous iron core 1 is produced, for example, by laminating a plurality of thin ribbons of amorphous alloy to form a unit laminated body and winding the unit laminated body around the plurality of inner core bars 3. In this case, the number of parts such as side plates and bolts is large, and the molding work takes time. In addition, since the number of tightening points increases, it is difficult to secure a constant core thickness value. In addition, amorphous iron cores are sensitive to stress, and if excessive stress is applied, the core characteristics are adversely affected. Therefore, it is important to manage the tightening force when forming the iron core.

  As another method for manufacturing an amorphous iron core, Patent Document 1 discloses that “a table T is arranged on both sides of a rectangular mandrel M to form a stacking base Ts. After the ribbons are stacked, the table support is removed, and the ribbons are suspended by its own weight to form an inverted U-shaped iron core I'.Next, a U-shaped frame is attached to the iron core, and the iron core I is attached. 'After fixing the outside part of the frame and inverting the frame and the iron core, close the open side of the iron core.'

JP-A-4-223313

  The conventional iron core forming method works while checking the core thickness value so that the side plate is not excessively tightened to the iron core. In this case, there is a difference in the tightening degree by the operator, and it is difficult to always ensure a stable core thickness value. If tightening is insufficient, the lap part may not reach during the assembly process of the iron core. If tightened too much, the iron core may seize during annealing, which may adversely affect the characteristics. Speaking of the characteristics of the iron core, if the thickness space factor changes by 1%, the iron loss increases by several percent and the apparent power increases by 10% or more. There is also a method of forming an iron core using a stacking thickness control jig, but the number of jigs and work man-hours increase.

  In the three-phase tripod iron core, as shown in FIG. 11, the outer iron core 13 is arranged outside the inner iron core 12. However, as described above, it is difficult to secure a stable core thickness value. When the size swells more than the design value, the core length of the outer iron core 13 is made long enough to accommodate the bulge of the inner iron core 12, which increases the core material cost.

  Further, Patent Document 1 discloses that a U-shaped frame is attached to the iron core and the outer portion is fixed. However, to attach the frame to the iron core, the iron core needs to be lifted by a crane or the like. In addition, it is necessary to turn the iron core up and down in order to perform the lapping work of the iron core, so that workability is low and man-hour is required.

  An object of this invention is to provide the manufacturing method of the amorphous iron core which can ensure an accurate iron core lamination value, has high workability, and can reduce work man-hours.

In order to achieve the above object, the present invention employs the structures described in the claims.
The present invention includes a plurality of means for solving the above-mentioned problems. If an example of a method for producing an amorphous iron core according to the present invention is given, a method for producing an amorphous iron core in which thin ribbons of amorphous magnetic alloys are laminated, A plurality of amorphous magnetic alloy ribbons having an open end are arranged on the outer peripheral side of the inner core bar to create an inverted U-shaped iron core, and the inverted U-shaped iron core is used as a workbench A step of placing the first frame body on the iron core, covering both sides and the bottom with the first frame body other than the open end of the iron core, and the end of the open core Folding the core and sequentially closing the iron core; fitting the second frame body into the first frame body; covering the end of the iron core with the second frame body; and annealing the iron core; , Are provided.

  According to the present invention, it is possible to prevent the variation of the core thickness value by the operator, and it is possible to always ensure an accurate core thickness value for both the core core portion and the yoke portion, and stable core characteristic values. Is obtained. Moreover, the number of jigs and work man-hours required for iron core forming can be reduced.

It is a front view of the state which took out an iron core from a cutting machine. It is a front view of the state which attached the U-shaped side board to the iron core of Example 1 of this invention. It is a front view which shows the state which folds the edge part of an iron core and closes an iron core sequentially. It is a front view of the state which attached the U-shaped clamp jig | tool of Example 1 of this invention. It is a front view which shows the state which connected the U-shaped clamp jig | tool and the inner core metal with the volt | bolt. It is the side view which clamped the U-shaped side plate and the U-shaped clamp jig with the band. It is a front view of the state which attached the U-shaped side board to the iron core of Example 2 of this invention. It is a front view of the state which attached the side plate variable jig to the iron core of Example 3 of this invention. It is a side view of the side plate and bottom plate of the side plate variable jig of Example 3 of the present invention. It is a figure which shows an example of the iron core shaping | molding method of a prior art. It is a structural diagram of a three-phase tripod iron core.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings for explaining the embodiments, the same components are denoted by the same names and symbols, and the repeated explanation thereof is omitted.

A method for manufacturing an amorphous iron core according to Example 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a view showing a state where an iron core is taken out from a cutting machine. The iron core 1 is configured by, for example, laminating a plurality of thin ribbons of amorphous alloy to form a unit laminated body, and arranging a plurality of unit laminated bodies around the inner core metal 3. The iron core 1 has an inverted U shape, and one side is open. An inner core 3 is attached to the inner peripheral side of the iron core, and the inner core 3 and the contact plate 2 are connected by a bolt 4. By performing this connection so as not to loosen, the opening of the iron core can be prevented, and the core thickness value of the tightening portion can be set to an accurate value. In addition, the arrow in FIG. 1 has shown the direction of the force by bolting | tightening.

  FIG. 2 is a front view of a state where a U-shaped side plate is attached to the iron core on the work table. In the figure, 5 is a U-shaped side plate, and the material is a metal such as iron from the viewpoint of strength and annealing. The arrows indicate the force with which the iron core 1 is pressed against the U-shaped side plate 5 and the force with which the iron core 1 is pushed in the opening direction.

  First, the iron core shown in FIG. 1 is placed on the work table 15. Then, the U-shaped side plate 5 is fitted into the iron core 1 in the direction indicated by the large arrow.

  The U-shaped side plate 5 can be easily attached to the iron core 1 by simply pushing it in from the Y direction. The iron core shape can be accurately fixed by the U-shaped side plate 5 and the inner core metal 3. Furthermore, by setting the dimension of the U-shaped side plate 5 to an arbitrary value, the core thickness value can be easily set to a specified value. In order to attach the frame to the iron core in Patent Document 1, it is necessary to lift the iron core with a crane or the like, but in the present invention, the U-shaped side plate 5 is manually placed on the iron core placed on a workbench or the like. It can be installed simply by pushing. Therefore, versatility is high and workability is good. In addition, since the mass of the U-shaped side plate 5 itself is lighter than that of the frame, the attaching operation is facilitated. This is more effective as the iron core size increases.

  Before the U-shaped side plate 5 is completely attached to the iron core 1, the contact plate 2 and the bolt 4 are removed. Then, after the U-shaped side plate 5 is completely attached to the iron core 1, the iron core is lapped. In Patent Document 1, since the lap work is performed after the frame is attached, it is necessary to turn the iron core upside down, which takes man-hours. In the present invention, if the work is performed by placing the iron core on a work table or the like, Since there is no need to flip it upside down, workability is high and the number of work steps can be reduced.

  FIG. 3 is a front view showing a state in which after the U-shaped side plate 5 is attached, the end of the iron core is folded and the iron core is sequentially closed. As indicated by the arrows, the ends of the amorphous alloy ribbons constituting the iron core 1 are sequentially folded, and the iron cores are sequentially closed from the inside toward the outside. This operation can also be performed on the work table.

  FIG. 4 is a front view of a state in which a U-shaped clamp jig is attached to the iron core. In a state where the end of the iron core is folded and the iron core is closed, the U-shaped clamp jig 6 is fitted into the opening side of the U-shaped side plate 5. Next, as shown in FIG. 5, the U-shaped side plate 5 and the inner core metal 3 are connected by the bolt 4, and the U-shaped clamp jig 6 and the inner core metal 3 are connected by the bolt 4. The opening of the shape side plate 5 is prevented from opening outward (in the direction of the arrow). Then, as shown in FIG. 6, the U-shaped side plate 5 and the U-shaped clamp jig 6 are tightened from the outside with a steel band 7, and by connecting these two, the thickness of the yoke portion and the core portion of the iron core is increased. Can be specified value. In Patent Document 1, the thickness of the yoke portion cannot be set to a specified value, and the iron core size may swell. Therefore, there is a risk that the lap portion does not reach during the iron core assembling work. Also from this point, it is important that the thicknesses of the yoke portion and the core portion of the iron core can be set to specified values.

  (1) to (6) in FIGS. 1 to 6 are the tightening order of the iron core, and the wrap shape is improved by tightening from a position far from the wrap portion. As a result, the extra length is not necessary, and the material cost can be reduced.

  The iron core 1 integrated by the U-shaped side plate 5 and the U-shaped clamp jig 6 is then placed in an annealing furnace and subjected to magnetic field annealing (annealing). After the magnetic field annealing, the inner core metal 3 and the U-shaped side plate 5 are removed, the iron core joint is opened, the winding is inserted into the iron core leg, the iron core is closed again, and a transformer having an amorphous iron core is manufactured. .

  According to the present embodiment, the U-shaped side plate is fitted into the iron core in which the ribbons of amorphous alloy are laminated, and the U-shaped clamp jig is fitted into the opening of the U-shaped side plate so that the iron core by the operator is Variations in the thickness value can be prevented, an accurate core thickness value can always be ensured, and a stable core characteristic value can be obtained. In particular, in the three-phase tripod iron core shown in FIG. 11, the shape of the inner iron core is stably formed, so that the shape of the outer iron core disposed outside the inner iron core is stabilized and the margin of the iron core length can be reduced. It becomes possible, and iron core material can be reduced.

  Also, by attaching the U-shaped side plate in a state where the iron core is placed on a work table or the like, workability is improved and the number of work steps can be reduced.

  A second embodiment of the present invention will be described with reference to FIG. In Example 2, the shape of the U-shaped side plate of Example 1 is modified. FIG. 7 is a front view in which a U-shaped iron core forming side plate 9 is attached to the iron core 1. A large arrow indicates a direction in which the side plate 9 is fitted, and a small arrow indicates a direction in which a force is applied. The curved portion of the U-shaped side plate 9 has a shape along the R portion of the iron core.

  According to the present embodiment, by using the U-shaped side plate 9, the R portion of the iron core and the curved portion of the side plate are aligned, so that deformation of the iron core R portion can be prevented. Thereby, the characteristic of an iron core can be stabilized. If the side plate is not U-shaped but rectangular, a space is generated between the R portion of the iron core and the jig, and a potential for drooping of the iron core occurs in that portion.

  In attaching the U-shaped side plate, the abutment plate 2 and the bolt 4 are removed before the U-shaped side plate 9 is completely attached. And the process after attaching the U-shaped side plate 9 completely is the same as the process after attaching the U-shaped side plate of Example 1 to an iron core.

  A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the interval between the side plates can be varied in the U-shaped side plate of the first embodiment. FIG. 8 is a front view of a state in which the side plate variable jig is attached to the iron core, and FIG. 9 is a side view of the side plate and the bottom plate of the side plate variable jig. A large arrow indicates a direction in which the side plate variable jig 10 is fitted, and a small arrow indicates a direction in which a force is applied.

  The side plate variable jig 10 is formed of two side plates 10a and a bottom plate 10b. The protrusion 10aa of the side plate 10a of the side plate variable jig is inserted into the notch 10bb provided on the bottom plate 10b of the side plate variable jig, and the side plate 10a is connected using the bottom plate connecting bolt 11 at the jig connecting portion 10ba. Depending on the dimensions of the iron core 1, the role of the plurality of U-shaped side plates can be integrated into one jig by properly using a plurality of connection locations 10 ba prepared for the bottom plate 10 b of the side plate variable jig. . Therefore, it is possible to reduce costs by reducing the number of jigs and reduce the jig storage space. Although not shown, the structure of the U-shaped clamp 6 can be the same as that of the side plate variable jig 10. Before the side plate variable jig 10 is completely attached, the contact plate 2 and the bolt 4 are removed. And the process after attaching the side plate variable jig | tool 10 completely is the same as the process after attaching the U-shaped side board of Example 1 to an iron core.

  In the figure, a plurality of cutouts 10bb for inserting the protrusions 10aa are prepared and the protrusions of the side plate are inserted into the selected cutouts. However, the side plate 10a can be moved by a screw, You may enable it to adjust the space | interval of the side plate 10a continuously.

  According to the present embodiment, the interval between the side plates of the U-shaped side plate can be varied, so that it can be attached to a plurality of iron cores having different dimensions.

DESCRIPTION OF SYMBOLS 1 Iron core 2 Contact plate 3 Inner core metal 4 Bolt 5 U-shaped side plate 6 U-shaped clamp jig 7 Steel band 8 Conventional side plate 9 U-shaped side plate 10 Side plate variable jig 10a Side plate variable jig side plate 10aa Tool connection projection 10b Bottom plate 10ba of side plate variable jig Jig connection location 10bb Bottom plate notch 11 Side plate, bottom plate connection bolt 12 Inner core 13 Outer core 15 Worktable

Claims (11)

A method for producing an amorphous iron core in which thin ribbons of amorphous magnetic alloys are laminated,
On the outer peripheral side of the inner core metal, arranging a plurality of amorphous magnetic alloy ribbons whose ends are opened, and creating an inverted U-shaped iron core;
The step of disposing the inverted U-shaped iron core on a workbench, fitting the first frame into the iron core, and covering both sides and the bottom of the iron core other than the opened end with the first frame. When,
Folding the opened core ends and sequentially closing the cores;
Fitting the second frame body into the first frame body and covering the end of the iron core with the second frame body; and
Annealing the iron core;
A method for producing an amorphous iron core comprising: In the manufacturing method of the amorphous iron core according to claim 1,
The method for manufacturing an amorphous iron core, wherein the first frame body is a U-shaped side plate. In the manufacturing method of the amorphous iron core according to claim 1,
The method for manufacturing an amorphous iron core, wherein the second frame body is a U-shaped clamp jig. In the manufacturing method of the amorphous iron core according to claim 1,
Following the step of creating the inverted U-shaped iron core,
A process for producing an amorphous iron core comprising the step of sandwiching the iron core between the inner core metal and a plate-like member arranged on the outer peripheral side of the iron core, and connecting the inner core metal and the plate-like member with a bolt. Method. In the manufacturing method of the amorphous iron core according to claim 4,
Following the step of covering both sides and bottom of the iron core with the first frame,
A method for producing an amorphous iron core, comprising a step of removing the plate member and the bolt arranged on the outer peripheral side of the iron core. In the manufacturing method of the amorphous iron core according to claim 1,
Following the step of covering the end of the iron core with a second frame,
A method of manufacturing an amorphous iron core, comprising: connecting the first frame and the inner core with a bolt, and connecting the second frame and the inner core with a bolt. In the manufacturing method of the amorphous iron core according to claim 1,
Following the step of covering the end of the iron core with a second frame,
A method for producing an amorphous iron core, comprising the step of tightening the first frame and the second frame from the outside with a band. In the manufacturing method of the amorphous iron core according to claim 1,
A method for manufacturing an amorphous iron core, wherein at least one of the first frame and the second frame is a U-shaped side plate. In the manufacturing method of the amorphous iron core according to claim 1,
The method for manufacturing an amorphous iron core according to claim 1, wherein the first frame body has an interval between both side plates adjustable to a plurality of dimensions. In the manufacturing method of the amorphous iron core according to claim 9,
The method of manufacturing an amorphous iron core, wherein the first frame body includes a bottom plate and two side plates, and the two side plates can be attached to positions of the bottom plates having different intervals. In the manufacturing method of the amorphous iron core according to claim 9,
The method of manufacturing an amorphous iron core, wherein the first frame body includes a bottom plate and two side plates, and the distance between the two side plates can be continuously adjusted by a screw.

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