JP4898240B2 - Manufacturing method of iron core pieces - Google Patents

Description

The present invention relates to a stator core piece or a rotor core piece of a rotating machine (for example, a generator or an electric motor) from a metal thin plate (for example, a silicon steel plate or a magnetic iron plate other than a silicon steel plate), and a stator laminated core obtained by laminating them. or in the production of laminated rotor core, it relates to the production how the core pieces to increase the utilization rate of the sheet metal.

A progressive press die apparatus (for example, refer to Patent Document 1) punches, for example, a rotor core piece and a stator core piece from a workpiece plate (metal thin plate) that is intermittently passed, and rotates by laminating them. The company manufactures core laminated cores and stator laminated cores. And in order to improve the material yield of a metal thin plate, a rotor lamination | stacking iron core is often formed from the inner side area | region (namely, circular opening part) which generate | occur | produces when stamping a stator core piece.
However, in recent years, depending on the type of electric motor, a stator laminated core is required, but a rotor laminated core is not necessarily required. Further, the rotor core piece of the rotor laminated core may be manufactured from a material different from that of the stator core piece. For these reasons, when punching and forming the stator core piece from a thin metal plate with a press mold apparatus, if the rotor core piece made of the same material as the stator core piece is unnecessary, the stator core piece is formed. The inner region of the case becomes waste material, and the yield of the metal thin plate is reduced.
As a technique for this material yield reduction problem, for example, as described in Patent Document 2, all stator core pieces are divided and formed by punching, and then the divided stator core pieces are connected in an annular shape. is there.

JP-A-6-114467 JP 2000-152525 A

According to this technology, the yield of the thin metal plate is slightly increased, but it is necessary to work to connect the split stator core pieces in an annular shape. Depending on the connection method, the connection strength increases. It is weaker than the core piece and may disturb the flow of magnetic flux.

The present invention has been made in view of such circumstances. A stator core piece or a rotor core piece is formed by punching without being divided from a thin metal plate, and a small size is formed from an inner region of the stator core piece or the rotor core piece. another core pieces to enable the production of, and an object thereof is to provide a manufacturing how the core pieces to increase the yield of the sheet metal (workpiece plate).

A method of manufacturing an iron core piece according to the first aspect of the present invention includes a rotary machine having a circular opening in the center by a main press working process through a plurality of steps from a strip-shaped metal thin plate that is passed through intermittently. In a method of manufacturing a large-diameter core piece (for example, a stator core piece or a rotor core piece),
In order to manufacture the large-diameter core piece on the metal thin plate, provided in the pre-process of the main press process is an auxiliary press-processing process for sequentially punching and forming small core pieces smaller than the diameter of the circular opening. In addition to the first pilot hole for positioning, a second pilot hole for positioning the small core piece is provided, and the second pilot hole is the metal thin plate or the circular shape located in the circular opening. It is formed in the punching part of the said large diameter iron core piece around the opening part.

In addition to the first pilot hole for positioning for manufacturing the large-diameter iron core piece, a second pilot hole for positioning the small iron core piece is provided, and the second pilot hole has the circular opening. The positioning accuracy of the small core piece is improved by forming it in the punched portion of the large-diameter core piece around the thin metal plate or the circular opening located at the portion.

The method of manufacturing a core piece according to the first invention, the small core pieces, for example, the case with the rotating machine is a stator core pieces used for another rotating machine varieties are different, and the rotating machine varieties be a rotor core pieces to be used for different other rotating machine, there is a case wherein a large径鉄heart piece for a rotating machine in one or more of plurality of divided segment core piece.

In the production method of the core pieces according to the first invention, the pre-process of the main pressing process, Tei Runode provided the step of auxiliary pressing process for sequentially punching form small compact core pieces than the diameter of the circular opening, A large-diameter core piece (that is, a stator core piece or a rotor core piece) can be formed from a strip-shaped metal thin plate by main press processing, and a small core piece can be punched and formed in the preceding process.
Therefore, the metal thin plate located in the circular opening of the large-diameter core piece that has been disposed of in the past can be effectively used.

In particular, in the manufacturing method of core pieces according to the first invention, in addition to the first pilot hole for positioning for the production of large径鉄heart piece, provided with a second pilot hole for positioning the small core pieces Therefore, the positioning accuracy of the small core pieces can be improved, and the die (die set) used for the auxiliary press processing can be miniaturized. When the second pilot hole is provided in the punched portion of the large-diameter core piece outside the circular opening, a larger small core piece can be formed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view showing a manufacturing method and equipment for an iron core piece according to the first embodiment of the present invention, and FIG. 2 is a manufacturing method and equipment for an iron core piece according to the second embodiment of the invention. FIG. 3 is an explanatory view of a method and equipment for manufacturing an iron core piece according to a third embodiment of the present invention.

As shown in FIG. 1, the iron core piece manufacturing facility according to the first embodiment of the present invention is a thin metal plate made of a strip-shaped magnetic steel plate that is intermittently passed through and has a thickness of about 0.1 to 0.5 mm. 10 to a large-diameter-sized stator core piece 11 (an example of a large-diameter core piece for a rotating machine), and a main press working device 12 for performing a main press working process for punching and forming, and a stator core provided in a preceding stage. an auxiliary pressing device 15 which performs an auxiliary pressing process for forming punching diameter of the stator core piece 14 from sheet metal 10 located in the center of the circular opening 13 of the strip 11 (an example of a small form core pieces) ing. These will be described in detail below.

The auxiliary press working device 15 includes a press working station A that forms pilot holes (first pilot holes) 16 for positioning at predetermined pitches on both sides in the width direction of the thin metal plate 10, and a magnetic pole portion 17 of the stator core piece 14. Of the magnetic pole portion 17 of the stator core piece 14 and the press processing station C for forming the slot and the magnetic pole portions 17 of the stator core piece 14 are separated and formed. Pressing station D for forming teeth 18, pressing station E for forming a plurality of caulking portions (caulking holes and / or caulking projections) 19 on the stator core piece 14, and outline removal of the stator core piece 14 And a press working station F to perform. A predetermined auxiliary pressing process is performed at each of the press processing stations A to F, the stator core pieces 14 are punched and formed, and a predetermined number of the stator core pieces 14 are caulked and laminated in the die of the press processing station F. A stator laminated iron core (not shown) is formed. Note that the press processing station B to the press processing station E can be appropriately replaced as necessary.

Here, the outer diameter d1 of the stator core piece 14 is smaller than the diameter d2 of the circular opening 13 of the stator core piece 11.
The next main press working apparatus 12 includes a press working station G for forming the circular opening 13 of the stator core piece 11, a press working station H for punching and forming the slot 20 of the stator core piece 11, and the stator core. A press processing station I that separates and forms adjacent magnetic pole portions 21 of the pieces 11, a press processing station J that forms internal teeth 22 at the inner end of the magnetic pole portion 21, and a press processing station K that forms a caulking portion 23; A press working station L for removing the outer shape of the stator core piece 11 is provided. In the press working station G, the ring piece 25 having the outer diameter d1 of the stator core piece 14 as the inner diameter and the diameter d2 of the circular opening 13 formed at the center of the stator core piece 11 as the outer diameter is punched and removed. (That is, this station becomes a ring piece punching and removing station).

In the above press processing stations G to L, the main press processing described above is performed, a large-diameter stator core piece 11 is punched and formed, and the stator core piece 11 is predetermined in the die of the press processing station L. The stator laminated iron core having a predetermined thickness is manufactured by caulking and stacking a number of sheets. In addition, the order of the processing of the press processing stations G to K can be changed as necessary, or a plurality of main press processing can be performed at one press processing station, and the number of press processing stations can be reduced. .
Thus, another stator core piece 14 can be formed by effectively using the metal thin plate 10 located in the circular opening 13 that has been disposed of in the past.

Next, the iron core piece manufacturing method and manufacturing equipment 26 according to the second embodiment of the present invention shown in FIG. 2 will be described. The iron core piece manufacturing method and equipment according to the first embodiment were used. Constituent elements are assigned the same numbers, and detailed description is omitted.
An iron core piece manufacturing facility 26 according to the second embodiment includes a main press working apparatus 12a having press working stations H to L and an auxiliary press working apparatus 27 including press working stations A1 to E1. In the processing device 12a, the stator core piece 11 is manufactured, and in the auxiliary press processing device 27, the stator core piece (an example of a small core piece) 28 used for a small rotating machine is manufactured.

In the press working station A1, four second pilot holes 29 are formed in the region of the circular opening 13 of the thin metal plate 10 in which the pilot holes 16 are formed on both sides in the width direction in the previous process in advance. The second pilot hole 29 is used to accurately position the stator core piece 28 formed in the circular opening 13. The outer pilot hole 16 is for conveyance, and a pilot pin (not shown) is loose at the press processing stations A1 to E1.

In the press working station B1, slotting for forming the magnetic pole portion of the stator core piece 28 is performed. In the press working station C1, the process of separating the magnetic pole portions of the stator core piece 28 and the inner shape removal (that is, the formation of the region into which the rotor is inserted) are performed. In the press processing station D1, the caulking portion is formed. Then, at the press processing station E1, the outer shape of the stator core piece 28 is removed, and the stator core pieces 28 are caulked and laminated in the lower die. The outer diameter of the stator core piece 28 is d3.

Next, the stamping station H punches and forms the slots, and at the same time, punches out the inner shape of the stator core piece 11, that is, punches out the circular opening 13. Here, since the diameter of the circular opening 13 is d2, the ring piece having the outer diameter d2 and the inner diameter d3 is removed at the press processing station H. A second pilot hole 29 is formed in the ring piece. In the main press working device 12a, the metal thin plate 10 is accurately positioned by the pilot holes 16 and the stator core piece 11 is punched and pressed.
In the press processing stations A1 to E1, press die dies sets 30 to 34 each having a die of each press processing station and a punch paired therewith are easily replaceable. This is because a plurality of types of small core pieces can be formed by the auxiliary press working device 27. Reference numerals 35 and 36 denote guide posts.

Then, although the manufacturing method and installation of the iron core piece which concern on the 3rd Embodiment of this invention shown in FIG. 3 are demonstrated, in this embodiment, press work station A2-D2 which forms the auxiliary press work apparatus 37 is demonstrated. In addition, press die dies 39 to 42 for manufacturing a rotor core piece (an example of a small core piece) 38 used for a rotating machine smaller than the rotating machine formed by the stator core piece 11 are provided. ing. In the press processing station A2, the second pilot hole 43 is formed in the region of the circular opening 13 of the stator core piece 11, and in the press processing station B2, the shaft hole 44 of the rotor core piece 38 is removed. The In the press processing station C2, the caulking portion 45 of the rotor core piece 38 is formed, and the outer shape is removed in the press processing station D2. Caulking lamination of the rotor core pieces 38 is performed in the die of the press working station D2.

Thereafter, the circular opening 13 of the stator core piece 11 is punched and formed at the press processing station H. When the outer diameter of the rotor core piece 38 is d4, the ring piece having the outer diameter d1 and the inner diameter d4. Will be removed. A second pilot hole 43 is formed in the ring piece.
Also in this embodiment, the second pilot hole 43 performs accurate positioning of the rotor core piece 38.

In the said embodiment, although the example about the effective use of the circular opening part 13 produced when forming the stator core piece 11 from the metal thin plate 10 was shown, when forming a rotor core piece from the metal thin plate 10 The present invention is also applied to the case where small rotor core pieces and stator core pieces are manufactured by effectively using the generated metal thin plate in the shaft hole region.
Further, in the second and third embodiments, the second pilot hole is formed in the ring piece to be removed, but the gap between the magnetic pole portions of the stator core piece (an example of a large-diameter core piece) ( In other words, a second pilot hole may be formed at the slot position, whereby a larger-diameter stator core piece or a rotor core piece (each of the small core pieces is separated from the circular opening formed in the center portion). An example) can be obtained.
Further, in the region within the circular opening 13, one or more of the divided core pieces (an example of small core pieces) obtained by further dividing the stator core piece 11 into a plurality of pieces are manufactured, and a plurality of these divided core pieces are produced. It is also possible to prepare and assemble the stator core pieces.
In the above embodiment, the ring piece punching / removing station is provided at the first station of the main press working apparatus, but the ring piece punching / removing station is provided at a station in the middle of the main press working apparatus or at the final stage of the auxiliary press working apparatus. It can also be provided.

It is explanatory drawing which shows the manufacturing method and installation of the iron core piece which concern on the 1st Embodiment of this invention. It is explanatory drawing of the manufacturing method and installation of the iron core piece which concern on the 2nd Embodiment of this invention. It is explanatory drawing of the manufacturing method and installation of the iron core piece which concern on the 3rd Embodiment of this invention.

10: Metal thin plate, 11: Stator core piece, 12, 12a: Main press machine, 13: Circular opening, 14: Stator core piece, 15: Auxiliary press machine, 16: Pilot hole, 17: Magnetic pole part 18: internal teeth, 19: caulking part, 20: slot, 21: magnetic pole part, 22: internal toothing, 23: caulking part, 25: ring piece, 26: manufacturing equipment for iron core piece, 27: auxiliary press working device, 28: Stator core piece, 29: Second pilot hole, 30-34: Press die set, 35, 36: Guide post, 37: Auxiliary press working device, 38: Rotor core piece, 39-42: Press die set, 43: Pilot hole, 44: Shaft hole, 45: Caulking part

Claims (5)

In a method of manufacturing a large-diameter core piece for a rotating machine having a circular opening in the center by a main press processing through a plurality of steps from a strip-shaped metal thin plate that is intermittently passed,
In order to manufacture the large-diameter core piece on the metal thin plate, provided in the pre-process of the main press process is an auxiliary press-processing process for sequentially punching and forming small core pieces smaller than the diameter of the circular opening. In addition to the first pilot hole for positioning, a second pilot hole for positioning the small core piece is provided, and the second pilot hole is the metal thin plate or the circular shape located in the circular opening. A method of manufacturing an iron core piece, wherein the iron core piece is formed in a punched portion of the large-diameter iron core piece around an opening . In the manufacturing method of the iron core piece according to claim 1 , after the small iron core piece is formed by punching from the metal thin plate, the small iron core piece is removed on the inner side in the step immediately before or during the main press processing. A method of manufacturing an iron core piece, wherein a ring piece forming a circular opening is punched and removed . 3. The method of manufacturing an iron core piece according to claim 1 , wherein the small iron core piece is a stator iron core piece used for another rotating machine having a different product type from the rotating machine. Method. 3. The method of manufacturing an iron core piece according to claim 1 , wherein the small iron core piece is a rotor iron core piece used for another rotating machine having a different product type from the rotating machine. Method. 3. The method of manufacturing an iron core piece according to claim 1 , wherein the small iron core piece is one or more of divided core pieces obtained by dividing the large-diameter core piece for the rotating machine into a plurality of pieces. A manufacturing method of a piece.

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