JP2013240186A - Method for manufacturing divided laminated core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a divided laminated core having an improved assemblability thereof, the method enabling a discharge of the divided laminated core having a level difference between a yoke and teeth without inclining the divided laminated core inside a mold to the outside of the mold.SOLUTION: A method for manufacturing a divided laminated core comprises: a yoke projection piece forming step in which a round hole having a same diameter with the inner diameter of a yoke piece 4 is formed by punching a thin strip material W; a slot punching step in which prescribed pieces of slots S are punched in the thin strip material W; a shearing/bending step in which connection portions 9 of adjacent divided core pieces in the divided core pieces 12 that are annularly aligned on the thin strip material W are sheared off to be separated, and a bending process is applied to each one side of the separated connection portions; an inner shape punching step in which teeth tips of teeth pieces 3 of divided core pieces 12 are formed by punching; and outer shape punching step in which each individual divided core piece is separated and formed by punching the outer shape of the divided core pieces 12, and laminating the divided core pieces on the under-layer divided core pieces 12 that have been already punched and formed, and fitting them together.

Description

The present invention relates to a method for manufacturing a split laminated iron core having a step at a lower part, an upper part, or an upper and lower part, which is used for a rotating electrical machine such as an electric motor or a generator.

  As described in Patent Document 1, iron core pieces punched from a thin strip material in a mold are laminated in the mold to form a product (laminated core), and a product cradle horizontally level the product. The product is lowered with the product held, and the product cradle is lowered to the lowest point, and the product is discharged by the product discharge cylinder (pusher).

On the other hand, as described in Patent Document 2, there has been proposed a split laminated iron core in which a step is formed in the laminated iron core itself by making the laminated height of the yoke part and the tooth part different. It is efficient to produce such a laminated core with a step by continuously punching and forming the core pieces using a mold apparatus and sequentially laminating them.

Further, as described in Patent Document 3, when the divided laminated iron cores individually taken out from the mold are assembled in an annular shape, a concave portion and a convex portion are formed at the end of the yoke portion, and the concave portions of the adjacent divided laminated iron cores are formed. The assemblability of the split laminated iron core is improved by fitting the projections.

JP 2001-96319 A JP 2001-157390 A JP 2000-078779

  However, when the split laminated core described in Patent Document 2 is formed by punching with the mold apparatus described in Patent Document 1, the split core pieces are kept horizontal while being held by the squeeze ring in the punching die. When the split laminated iron core moves from the squeeze ring to the cylinder head (product cradle) with a flat upper surface, it is placed in a tilted state on the cylinder head. When trying to discharge, there was a problem that not only the divided laminated iron core fell and deformed in the mold, but also the mold was damaged. In particular, in the case of a divided laminated iron core in which the teeth portions are not joined by caulking in order to improve the motor characteristics, there is a risk of frequent catching in the mold.

In addition, since the divided laminated cores are individually formed, there is a slight difference in the accuracy of the divided laminated cores, and the height of the yoke part and the teeth part of the divided laminated iron cores is different, so that the divided laminated iron cores are particularly annular. When assembling, the divided laminated iron cores cannot be balanced, and it is difficult to fit the divided laminated iron cores.

The present invention has been made in view of such circumstances, and a split laminated iron core having a step in the yoke part and the tooth part can be discharged out of the mold without tilting in the mold, and the assemblability of the divided laminated iron core is improved. An object of the present invention is to provide a method for manufacturing a divided laminated iron core.

A method for manufacturing a split laminated core according to the present invention is formed by laminating split core pieces each having a yoke piece portion and a tooth piece portion. A method of manufacturing a split laminated iron core formed by being connected to a yoke protruding piece forming step of punching and forming a round hole having the same diameter as the inner diameter of the yoke piece portion from the thin strip material, A slot punching process for punching out a number of slots, and shearing and separating one side of the separated connecting core pieces that are adjacent to the divided core pieces that are annularly arranged on the thin strip material A cutting and bending step, an inner shape punching step for punching and forming a tooth tip of the tooth piece portion of the split core piece, and punching out the outer shape of the split stator core piece to separate and form the individual split core pieces, The And a contour punching step of attaching by laminating split core pieces in segment core pieces of the lower layer which is punched first.

  The method for manufacturing a divided laminated core according to the present invention includes dividing each slot into a substantially half slot region in one direction and a substantially half slot region on the other side along the circumferential direction in the slot extracting step, A step of punching and forming a substantially half-slot region on the side, and a step of punching and forming a substantially half-slot region on the other side of each slot.

  The method for manufacturing a split laminated iron core according to the present invention has an intermediate region between a substantially half slot region in one direction and a substantially half slot region on the other side in the circumferential direction in each slot in the slot removing step. The intermediate region of each slot is punched and formed before the step of punching and forming the approximately half-slot region on one side of each slot and the step of punching and forming the approximately half-slot region on the other side of each slot. The manufacturing method of the division | segmentation laminated | stacked iron core characterized by having the process to do.

According to the method for manufacturing a split laminated iron core according to claim 1, since the split laminated iron core can be discharged out of the mold in an annular state, there is no inclination caused by the step between the yoke part and the teeth part of the split laminated iron core, It is possible to prevent tipping at the time of discharging and damage to the mold. Moreover, the assembling property between the divided laminated iron cores after winding is also improved.

According to the method for manufacturing a split laminated iron core according to claim 2, products having different steps in the yoke portion and the teeth portion of the split laminated iron core and having different tooth widths can be manufactured with a single mold.

According to the method for manufacturing a split laminated iron core according to the third aspect, it is possible to effectively punch a product having a wide tooth width and a product having an angle on the side surface of the tooth.

It is explanatory drawing of the manufacturing method of the division | segmentation laminated | stacked iron core which concerns on one embodiment of this invention. It is explanatory drawing of the manufacturing method of the division | segmentation laminated | stacked iron core which concerns on other embodiment of this invention. (A) is the division | segmentation laminated | stacked iron core manufactured by the manufacturing method of the division | segmentation laminated | stacked iron core which concerns on one embodiment of this invention. (B) is the division | segmentation laminated | stacked iron core manufactured by the manufacturing method of the division | segmentation laminated | stacked iron core which concerns on other embodiment of this invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for manufacturing a split laminated iron core according to the present invention will be specifically described below with reference to the accompanying drawings.

With reference to FIG. 1, the manufacturing method of the split laminated iron core which concerns on one embodiment of this invention is demonstrated.
As shown in FIG. 1, in the method for manufacturing a split laminated iron core according to an embodiment of the present invention, a mold having a station of A to I is used, and finally a station from a thin strip material W made of a magnetic material. The divided iron core pieces 6 are manufactured by laminating the divided iron core pieces 12 in the I mold. In the figure, the hatched portion indicates the punched portion of the blade.

FIG. 1 is a plan view of a thin strip W processed by a progressive mold apparatus according to the present invention. A progressive mold apparatus for producing a divided laminated core 6 includes a pilot hole forming station A, a yoke protruding piece formation. Station B, rotor piece extraction station C, slot extraction station D, first cutting and bending station E, second cutting and bending station F, caulking portion forming station G, inner diameter extraction station H, and outer shape extraction station I are provided. In addition, an idle process can be provided between each process as needed.

FIG. 3A is a front view and a side view of the divided laminated iron core 6 in a state of being punched out at the station I and caulked and laminated. A divided laminated iron core 6 having a step is formed in the yoke portion 7 and the tooth portion 8 in which the second yoke protruding piece 10, the divided iron core piece 12 and the first yoke protruding piece 11 are caulked and laminated. The split laminated iron core 6 is formed with a connecting portion 9 made of projections and depressions at the end of the yoke, and is discharged from the station I in a state where the connecting portions of the respective divided laminated cores 6 are fitted to each other.

The station A is a station that processes the pilot hole 1 for positioning and the mismatch hole 2 that prevents the cutter from being cut twice in the cutting and bending process described later. Pilot holes 1 are formed in the thin strip material W at a predetermined pitch, and the thin strip material W is positioned at each station. At this time, the mismatch hole 2 is also punched and formed at the same time. However, the mismatch hole 2 near the pilot hole 1 may be formed at the station B in order to prevent stress concentration on the material at the time of punching.

  The station B punches a round hole having the same diameter as the inner diameter of the yoke piece portion 4 of the divided iron core piece 12 and the same diameter as the inner diameter of the yoke piece portion 4 of the divided iron core piece 12 with a fixed blade. As a result, when the annular divided core pieces 12 are laminated, stepped portions are formed in the yoke portion 7 and the teeth portion 8 of the annular laminated core 6 formed in an annular shape.

Station C is a processing station for manufacturing rotors by sequentially forming rotor pieces. In the station D, a predetermined number of teeth 8 are formed around the opening O by punching a predetermined number of slots S around the opening O.

  At stations E and F, in the yoke portion forming region on the thin sheet material W, that is, at the portion where the yoke piece 4 of each divided iron core piece is formed in a ring shape, adjacent divided iron core pieces indicated by hatching in the figure. The twelve connecting portions 9 and the connecting portions 9 are shear-separated from each other and bent. By changing the direction of the cutter in two steps of station E and station F and bending it into the yoke portion forming region, the uneven portion is formed at the end of the yoke portion of the divided laminated core 6 after each divided iron core piece is laminated.

  Here, the connecting portion 9 in one divided core piece 12 and the connecting portion 9 in the other divided core piece 12 are shear-separated by a cutter extending to the outside and inside of the yoke portion forming region on the thin strip W. . At this time, since the blades located outside and inside the yoke forming region enter the mismatch hole 2 and the slot S described above, it is not necessary to cut the thin strip material twice, and the position of the divided core piece 12 is shifted. There is nothing.

  In the station G, the crimping portion 5 is formed at a predetermined location. In this case, a caulking portion is formed in the yoke portion forming region. The lowermost second yoke protruding piece 10 is formed with a caulking through hole, and the second yoke protruding piece, the divided core piece 12 and the first yoke protruding piece 11 are caulked and stacked on the second yoke protruding piece 10 V caulking is formed.

  In the station H, the inner diameter of the annularly formed divided core piece 12 (stator piece) that becomes the tooth tip of the tooth piece portion 3 is punched out. Since the opening O is formed when the rotor piece is punched out at station C, no load is applied to the tip of the punch, and the pressing operation can be performed with a lighter load, and the tooth tip of the tooth piece is accurate. Can be well formed.

  The station I is an outer shape removal station, and the outer shape of the divided core pieces 12 formed in a ring shape is formed by dividing the divided core pieces 12 subjected to the respective press processes, and the individual divided core pieces 12 are separated from the thin strip W. The divided core pieces 12 are laminated and bonded to the lower divided core pieces formed by punching first. In addition, since transposition and skew are well known, description is abbreviate | omitted.

  The annular divided laminated core produced by the method for producing laminated iron cores described above can separate the divided laminated iron cores 6 after being discharged from the mold apparatus, and the winding becomes extremely easy. Further, if the plurality of divided laminated cores 6 are connected to each other, the mounting area of the yoke portion 7 increases, so that stable winding can be performed without losing the balance, and the assembly is extremely easy. .

Then, the manufacturing method of the laminated iron core which concerns on other embodiment of this invention is demonstrated, referring FIG.
As shown in FIG. 2, in the manufacturing method of the laminated iron core which concerns on other embodiment of this invention, the structure which differs from the station demonstrated in embodiment of this invention using the metal mold | die which has the station of A ~ I. Only the slot extracting process of the stations D1, D2, and D3 will be described.

  FIG. 3B is a front view and a side view of the split laminated iron core 12 in a state in which it is punched at the station I and is caulked and laminated, including the slot removing process of the stations D1, D2, and D3. The teeth part 8 is formed in a bowl shape, the width of the teeth part 8 is varied, and the split laminated iron core 6 having a step in the yoke part 7 and the tooth part 8 is formed. The split laminated iron core 6 is formed with a connecting portion 9 made of projections and depressions at the end of the yoke, and is discharged from the station I in a state where the connecting portions of the respective divided laminated cores 6 are fitted to each other.

In the slotting process, the slot formation scheduled region of the thin strip material is divided into a substantially half slot region (left half slot region) SL on one side, an intermediate region, and a substantially radial slot region (right half on the other side) along the circumferential direction. Slot area) Divided into a plurality of areas divided into SR.

At the station D1, the intermediate area SM is punched and formed at the center of the slot formation scheduled place. In the station D2, the left half slot region SL is punched on the left side of the slot formation scheduled portion, and in the station D3, the right half slot region SR is punched and formed on the right side of the slot formation planned portion.

  The station D2 and the station D3 are provided with rotating means for rotating the punch and die of each station around the center of each of the divided core pieces formed in an annular shape, and according to the width of the slot S. Each punch and die can be rotated.

By forming the outer shape of the intermediate region SM slightly larger than the slot diameter in advance, it is possible to prevent the occurrence of whiskers and burrs due to the metal mold in the slot outer portion.

Further, the left half slot area SL punched out by the station D2 and the right half slot area SR punched out by the station D3 are punched so as to overlap with the intermediate area SM, so Can be prevented.

  As described above, according to another embodiment of the present invention, each slot is divided into a plurality of regions including the left half slot region SL, the intermediate region SM, and the right half slot region SR along the circumferential direction. In addition, since the intermediate region SM is formed first, the variable range of the tooth width can be widened by the width of the intermediate region SM.

  According to another embodiment of the present invention, a stepped portion is formed in the tooth portion 8 and the yoke portion 7, and the teeth portion 8 is angled from a product in which the shape of the tooth portion 8 is parallel and the tooth width is small. Even wide products can be manufactured using the same mold. That is, in another embodiment of the present invention, it is possible to manufacture a split laminated iron core 6 having different heights of the tooth portion 8 and the yoke portion 7 in which the width of the variable range of the tooth width is increased by about the width of the intermediate region SM. .

W: thin strip material, 1: pilot hole, 2: mismatch hole, 3: tooth piece, O: opening, S: slot, 4: yoke piece, 5: crimped part, 6: split laminated core, 7: yoke Portion, 8: teeth portion, SM: middle region, SL: left half slot region, SR: right half slot region, 9: connecting portion, 10: second yoke protruding piece, 11: first yoke protruding piece, 12 : Divided core pieces

Claims (3)

A method of manufacturing a split laminated core, which is formed by laminating split iron core pieces each having a yoke piece portion and a tooth piece portion, and finally connecting the divided laminated iron cores having different heights of the yoke portion or the teeth portion in an annular shape. A yoke protruding piece forming step of punching and forming a round hole having the same diameter as the inner diameter of the yoke piece portion from the thin strip member, a slot punching step of punching a predetermined number of slots in the thin strip member, and the thin plate A cutting step of shearing and separating one side of the separated connecting core pieces adjacent to each other of the divided core pieces arranged annularly on the strip, and the teeth pieces of the divided core pieces. An inner shape punching process for punching and forming the tooth tip of the part, and forming the individual divided core pieces by punching the outer shape of the divided stator core pieces, and the lower layer formed by punching the divided core pieces first Min Method for manufacturing a laminated core segments, characterized in that it has a contour punching step of attaching by laminating core pieces. 2. The slot extracting step according to claim 1, wherein each slot is divided into a substantially half-slot region in one direction and a substantially half-slot region on the other side along the circumferential direction, and the substantially half-slot region on one side of each slot is divided. A method for manufacturing a split laminated iron core, comprising: a step of punching and forming, and a step of punching and forming a substantially half-slot region on the other side of each slot. 4. The slot extracting step according to claim 3, wherein each slot has an intermediate region between a substantially half-slot region in one direction along the circumferential direction and a substantially half-slot region on the other side, and the one side of each slot. A step of punching and forming the intermediate region of each slot prior to the step of punching and forming the substantially half slot region of and the step of punching and forming the substantially half slot region on the other side of each slot. The manufacturing method of the division | segmentation laminated | stacked iron core characterized by the above-mentioned.

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