JP2009171719A - Method of manufacturing laminated core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated core, which suppresses bending distortion and extension as much as possible, is superior in dimensional accuracy and suppresses deterioration of magnetism performance and to provide a manufacturing device of the laminated core. <P>SOLUTION: The manufacturing method includes a half blanking bending process for depressing one core piece coupling part in a thickness direction, partially punching it and forming a bending part 30 bent in a punching direction while continuity of paired core piece coupling parts is maintained from a board to be worked W where the paired coupled core piece coupling parts 11A and 11B in divided core pieces 10 adjacent in a circumferential direction are continuously arranged and an inverse half blanking bending process for depressing one core piece coupling part 11A partially punched in the half blanking bending process to a side opposite to the punching direction and punching it until a pair of core piece coupling parts becomes discontinuous and bending the bending part to the opposite side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and apparatus for manufacturing a laminated iron core.

Conventionally, a plate-shaped divided core piece divided into a plurality of parts in the circumferential direction is formed by punching from a thin plate material, and a plurality of divided core pieces are caulked and laminated to form a divided core. A method of forming one iron core by connecting in the circumferential direction is performed (for example, see Patent Document 1). In the method of Patent Document 1, after punching a rotor core piece when punching a split core piece from a thin plate material, in a yoke forming region in which the split core pieces are continuously positioned annularly, the adjacent split core pieces are connected. Bending is performed so that the parts are shear separated from each other. Next, the thin plate material is formed flush with the thin plate material by pushing back the bent portion. Thereafter, the inner diameter, the teeth, and the outer diameter of the thin plate material are punched to separate and form individual divided core pieces, and these divided core pieces are caulked and laminated.
JP 2005-318863 A

  However, according to the method of Patent Document 1, it is necessary to bend at least the plate thickness of the plate material when the connecting portions of the thin plate material are shear-separated from each other, so that bending strain as plastic strain is likely to occur. Therefore, when performing the process of returning to the same level, there is a possibility that it will not be reliably restored by the springback. Furthermore, due to bending strain, a slight reduction in the plate thickness occurs at the bent portion. This decrease causes the material to extend toward the free end of the cut and bent portion according to the law of constant volume. Even if it is attempted to return the stretched cut and bent portion to the same level, it is extremely difficult to reliably return it to the original position. Moreover, such deformation as elongation becomes a factor that causes a decrease in magnetic performance as an iron core.

  The present invention has been made in order to solve the problems associated with the above-described prior art, and a manufacturing method of a laminated core capable of suppressing bending strain and elongation as much as possible, having excellent dimensional accuracy and suppressing a decrease in magnetic performance, and An object is to provide a manufacturing apparatus.

  A method for manufacturing a laminated core according to the present invention that achieves the above-described object is to form a plurality of divided laminated cores obtained by laminating a predetermined number of divided core pieces connected in a direction intersecting the lamination direction in an annular shape. A method of manufacturing a laminated core, wherein the pair of core pieces are maintained continuously from a work plate in which pairs of core pieces connected to each other in the circumferentially adjacent divided core pieces are continuously arranged. However, one of the core piece connecting portions is pressed in the thickness direction to be partially punched, and a half punch bending process for forming a bent portion bent in the punching direction, and a partial punching in the half punch bending process. A reverse half punch bending process in which one core piece connecting portion that has been extracted is pressed to the opposite side to the punching direction and punched until the pair of iron core piece connecting portions becomes discontinuous, and the bent portion is bent to the opposite side. To have And butterflies.

  An apparatus for manufacturing a laminated core according to the present invention that achieves the above-mentioned object is formed by annularly connecting a predetermined number of divided laminated cores formed by laminating a predetermined number of divided core pieces in a direction intersecting the lamination direction. A device for manufacturing a laminated core, wherein the pair of core pieces are maintained continuously from a work plate in which a pair of core pieces connected to each other of the divided core pieces adjacent in the circumferential direction are continuously arranged. However, one of the core piece connecting portions is pressed in the thickness direction and partially punched, and a half punching station for forming a bent portion bent in the punching direction, and partially punched in the half punching process. A reverse half punch bending station that presses the one core piece connecting portion that has been pulled out to the side opposite to the punching direction and punches the pair of core piece connecting portions to be discontinuous, and bends the bent portion to the opposite side, The Characterized in that it.

  The method of manufacturing a laminated core according to the present invention configured as described above is to punch out until a pair of core pieces are discontinuous by a reverse half punching process after partially punching in the half punching process, The punching amount is small and bending distortion and elongation are difficult to occur. Therefore, it is possible to manufacture a laminated iron core that is excellent in dimensional accuracy and suppresses a decrease in magnetic performance.

  The manufacturing apparatus for a laminated core according to the present invention configured as described above is for punching until one of the core piece connecting portions is partially punched and the pair of core piece connecting portions are discontinuous. Since the reverse half punching and bending station is provided, the punching amount is small at the time of punching, and bending distortion and elongation hardly occur. Therefore, it is possible to manufacture a laminated iron core that is excellent in dimensional accuracy and suppresses a decrease in magnetic performance.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a plan view showing a laminated core manufactured by the first embodiment of the method for manufacturing a laminated core according to the present invention. FIG. 2 is a perspective view showing one of the divided cores constituting the laminated core. 3 is a perspective view showing one of the divided iron core pieces constituting the divided iron core.

  The laminated core 1 in the present embodiment is a stator core used on the stator side of an electric motor, and is formed of a magnetic member. As shown in FIG. 1, the laminated iron core 1 has an annular yoke 2 and a plurality of teeth 3 that are formed to protrude inward from the yoke 2. The laminated core 1 is configured by connecting a number of divided laminated cores 4 corresponding to the teeth 3 in a ring shape in a direction crossing the lamination direction. As shown in FIGS. 1 and 2, each divided laminated iron core 4 has a divided yoke 5 that constitutes a part of the yoke 2 and a divided tooth 6 that constitutes one of the plurality of teeth 3. At both ends in the circumferential direction of the divided yoke 5, connecting portions 7A and 7B are formed to be engaged with and connected to other adjacent divided yokes 5. The connecting portions 7A and 7B have stepped portions 8A and 8B extending on the ridges. 8B is formed. One stepped portion 8A is formed to protrude in the circumferential direction from the radially outer region of the end portion, and the other stepped portion 8B is formed to protrude in the circumferential direction from the radially inner region of the end portion. These stepped portions 8A and 8B can be engaged with each other with high accuracy when the divided laminated cores 4 are connected to each other.

  The divided laminated core 4 is formed by laminating a predetermined number of divided core pieces 10 and connecting them by caulking. In addition, a predetermined skew angle may be given to each divided core piece 10 and caulked and laminated.

  As shown in FIG. 3, core piece connecting portions 11 </ b> A and 11 </ b> B that are in contact with the other divided core pieces 10 are formed at both ends in the circumferential direction of the divided core pieces 10. In the present embodiment, the core piece connecting portion 11A is formed with a radially outer region protruding in the circumferential direction, and the core piece connecting portion 11B is formed with a radially inner region protruding in the circumferential direction. The protruding portions of the core piece connecting portions 11A and 11B are stacked to form the step portions 8A and 8B of the connecting portions 7A and 7B described above.

  Next, the manufacturing method of the laminated iron core 1 which concerns on this embodiment is demonstrated.

  FIG. 4 is a plan view showing an example of material removal in the method for manufacturing a laminated core according to this embodiment.

  The to-be-processed board W is a strip | belt-shaped steel plate pulled out from the steel plate wound by the roll form. As shown in FIG. 4, a predetermined number of divided core pieces 10 are continuously formed from the workpiece plate W, with adjacent core piece connecting portions 11 </ b> A and 11 </ b> B, and material is taken in an annular form. Adjacent iron core piece connecting portions 11A and 11B are an association line between the iron core piece connecting portions 11A and 11B, and a cut line extending from the associating line to a radially inner and outer region of the yoke 2 on the work plate W. Cut along L.

  Further, from the work plate W, the material of the rotor core piece 12 constituting the rotor core (not shown) is taken at the center of a predetermined number of divided core pieces 10 formed in an annular shape. Thus, the material of the rotor core piece 12 and the stator core piece (the divided core piece 10) is taken in the same plane form when the electric motor is configured.

  5 to 8 show the processed plates arranged and processed in the laminated core manufacturing apparatus according to the first embodiment, and FIG. 5 shows the processed plates arranged in stations S1 and S2 of the same manufacturing apparatus. FIG. 6 is a plan view showing a work plate placed at stations S3 to S5 of the manufacturing apparatus, and FIG. 7 shows a work board placed at stations S6 to S8 of the production apparatus. FIG. 8 is a plan view showing a plate to be processed arranged at stations S9 to S11 of the manufacturing apparatus. In addition, the diagonal line in FIGS. 5-8 represents the site | part punched out.

  Moreover, FIG. 9 is sectional drawing which shows the type | mold structure of the half punching station S1 of the manufacturing apparatus which concerns on this embodiment, (A) is before clamping, (B) is in the middle of clamping, (C) is Shown after clamping. FIG. 10 is a cross-sectional view showing a mold structure of the first pushback station S2 of the manufacturing apparatus, where (A) shows before mold clamping, (B) shows the middle of mold clamping, and (C) shows after mold clamping. . FIG. 11 is a cross-sectional view showing the mold structure of the second pushback station S3 of the manufacturing apparatus, where (A) shows before mold clamping, (B) shows the middle of mold clamping, and (C) shows after mold clamping. . FIG. 12 is a cross-sectional view showing the mold structure of the reverse half punching and bending station S4 of the manufacturing apparatus, (A) before mold clamping, (B) in the middle of mold clamping, and (C) after mold clamping. .

  The manufacturing apparatus 20 according to the present embodiment is a progressive mold apparatus, and a plurality of stations S1 to S11 that perform different processing are arranged in a line, so that each station W Each processing can be performed simultaneously by one operation of the mold.

  The workpiece plate W is fed forward to the half-bending and bending station S1 after the rotor core piece 12 is punched by punching by a station (not shown) performed earlier to form the opening 13.

  In the half punching station S1, as shown in FIG. 5 and FIG. 9, the divided core pieces are separated along the cut line L between the adjacent core piece connecting portions 11A and 11B of the divided core pieces 10 arranged in an annular shape. An amount of approximately half (t / 2) of the plate thickness t of 10 is punched out and bent (half punching process). As shown in FIG. 9 (A), the half blanking station S1 has a half blank stripper plate 21 and a half protruding from the half blank stripper plate 21 by approximately half (t / 2) of the thickness t of the split core piece 10. A punching die 22, a half punching die 23, and a half punching backup die 25 provided on the half punching die 23 facing the half punching die 22 and biased by a half punching spring 24 are arranged. The half punch punch 22 protrudes from the half punch stripper plate 21 approximately half (t / 2) of the thickness t of the split core piece 10, and a half punch shear blade 26 </ b> A is formed at the edge along the cut line L. A half-bending curved portion 27A having a predetermined curvature R1 as appropriate is formed at the edge opposite to the side where the half-blanking shear blade 26A is provided.

  The half punch backup die 25 is disposed so as to be substantially flush with the half punch die 23.

  A half punching shear blade 26B is formed on the edge of the half punching receiving portion 28 where the half punching backup die 25 of the half punching die 23 is provided, corresponding to the half punching shearing blade 26A of the half punching punch die 22. A semi-bending curved portion 27B having a predetermined curvature R2 as appropriate is formed at the edge opposite to the side where the shearing blade 26B is provided.

  The half punched shear blades 26A and 26B of the half punch punch 22 and the half punch backup die 25 have a planar shape perpendicular to the shear direction. When the half punching stripper plate 21 is lowered and close to the half punching die 23, the work plate W is sandwiched between the half punching backup die 25 and the half punching punch die 22 as shown in FIG. 9B. It is. Thereafter, as shown in FIG. 9C, the half-punch backup die 25 moves backward while being pushed by the half-punch spring 24, and a half-punch portion 29 is formed along the half-punch shear blade 26A of the half-punch punch die 22. At the same time, the bent part 30 is formed. The half-punch amount X, which is the length half-punched in the shearing direction at this time, is approximately half the plate thickness (t / 2). Note that the half punching amount X does not necessarily have to be substantially half of the plate thickness (t / 2), and the workpiece W is not completely punched and penetrated, that is, two core pieces connected to each other are connected. What is necessary is just to punch partially, maintaining the continuity of part 11A, 11B. Therefore, the amount of protrusion of the half punching die 22 from the half punching stripper plate 21 may not be substantially half the plate thickness t (t / 2).

  In this way, by performing half blank bending while sandwiching the work plate W between the half blank punch die 22 and the half blank backup die 25, the cutting line while suppressing the force to be deformed due to a bending moment generated during half blank shearing. A half-punch shearing process can be performed along L, and the effect of extremely stabilizing the shape of the shearing surface can be obtained.

  Further, by sandwiching the work plate W between the planes of the half punching punch die 22 and the half punching backup die 25 perpendicular to the shearing direction, a shear plane perpendicular to the workpiece can be obtained extremely stably.

  Further, since the half punched bending die 27 and the half punching die 23 are respectively formed with half punched curved portions 27A and 27B, an appropriate free space is formed around the bent portion 30 during the half punching bending process. Thus, the bent portion 30 can be formed. In addition, the shape of the cut line L can be appropriately set without being limited to the embodiment as long as it can be half-cut between the iron core piece connecting portions 11A and 11B and bend. Therefore, for example, a plurality of steps may be formed in each of the iron core piece connecting portions 11A and 11B, or a step may not be provided.

  After the half blanking station S1, the work plate W is fed forward to the first pushback station S2. In the first pushback station S2, as shown in FIGS. 5 and 10, the bent core piece connecting portion 11A is pushed back and formed so as to be flush with the workpiece W (first pushback step). ). That is, the workpiece W is held between the pushback die 31 and the pushback stripper plate 32 (FIG. 10A), and the workpiece W is held between the pushback die 31 and the pushback stripper plate 32. By sandwiching the core piece connecting portion 11A with the stripper plate 32 for pushback (FIG. 10B), the core piece connecting portion 11A is formed flush with the workpiece W (FIG. 10C). )).

  After the first pushback station S2, the work plate W is sequentially fed to the reverse half punching and bending station S3. In the reverse half blanking station S3, as shown in FIGS. 6 and 11, along the half blanking portion 29 formed in the half blanking process, half blanking and bending are performed (reverse half blanking process). ). That is, along the cut line L, it is half-cut in the reverse direction and bent.

  As shown in FIG. 11 (A), the reverse half punching and bending station S3 includes a reverse half punch stripper plate 34 and a reverse half punch die 35, and approximately half the thickness t of the split core piece 10 from the reverse half punch die 35. (T / 2) The protruding reverse half punch punch die 36 and the reverse half punch backup die provided on the reverse half punch stripper plate 34 facing the reverse half punch punch die 36 and biased by the reverse half punch spring 41 38 are arranged. The reverse half punch punch die 36 protrudes from the reverse half punch stripper plate 34 by approximately half of the thickness t of the divided core piece 10, and a reverse half punch shear blade 39 </ b> A is formed at the edge along the cut line L. A reverse half punched curved portion 40A having a predetermined curvature R3 as appropriate is formed at the edge opposite to the side where the shearing blade 39A is provided. The reverse half punch backup die 38 is disposed so as to be substantially flush with the reverse half punch stripper plate 34.

  A reverse half punching shear blade 39B is formed at the edge of the housing portion 44 where the reverse half punch backup die 38 of the reverse half punch stripper plate 34 is provided, corresponding to the reverse half punch shear blade 39A of the reverse half punch punch die 36. In addition, a reverse half punching curved portion 40B having a predetermined curvature R4 as appropriate is formed at the edge opposite to the side where the reverse half punching shear blade 39B is provided.

  When the reverse half punch stripper plate 34 descends and approaches the reverse half punch die 35, the work plate W is sandwiched between the reverse half punch backup die 38 and the reverse half punch punch die 36 as shown in FIG. It is. Thereafter, as shown in FIG. 11C, the reverse half punch backup die 38 moves backward while being pushed by the reverse half punch spring 41, and reverse half punch along the reverse half punch shear blade 39A of the reverse half punch punch die 36. The portion 42 is molded, and the bent reverse bent portion 43 is molded. At this time, in the half blanking process in the station S1, since the work plate W has already been half blanked, the reverse half blank portion 42 penetrates completely. The reverse half-punching shearing blades 39A and 39B of the reverse half-punching punch die 36 and the reverse half-punching backup die 38 have planar shapes perpendicular to the shearing direction. Reverse half blanking is performed while the work plate W is sandwiched between the backup dies 38. At this time, the reverse half-punch amount Y, which is the length half-pull-cut in the shearing direction, is substantially half (t / 2) of the plate thickness t. The reverse half punching amount Y does not necessarily have to be approximately half (t / 2) of the plate thickness t, and the workpiece plate W can be completely punched and penetrated while considering the previous half punching bending process. I can do it. Therefore, the amount of protrusion of the reverse half punching die 36 from the reverse half punching die 35 may not be substantially half the plate thickness t (t / 2).

  In this way, by performing reverse half punching while sandwiching the work plate W between the reverse half punch punch die 36 and the reverse half punch backup die 38, the force to be deformed by a bending moment generated during reverse half punch shearing is suppressed. However, the reverse half-punch shearing can be performed, and the effect of extremely stabilizing the shape of the shearing surface can be obtained. Further, by sandwiching the work plate W with a plane perpendicular to the shear direction, a shear plane perpendicular to the shear direction can be obtained extremely stably.

  Further, the reverse half punching die 36 and the reverse half punching stripper plate 34 are formed with reverse half punching curved portions 40A and 40B, respectively. A free space is appropriately formed, and the reverse bent portion 43 can be formed.

  After the reverse half punching and bending station S3, the work plate W is sequentially fed to the second pushback station S4. In the second pushback station S4, as shown in FIG. 6 and FIG. 12, the reversely bent iron core piece connecting portion 11A is pushed back and formed so as to be flush with the workpiece W (second pushback). Process). That is, the workpiece plate W is held between the pushback die 45 and the pushback stripper plate 46 (FIG. 11A), and the workpiece plate W is held by the pushback die 45 and the pushback stripper plate 46. The core piece connecting portion 11A is formed flush with the plate W to be processed (FIG. 11 (C)).

  After the second pushback station S4, the work plate W is sequentially fed to the slot removal station S5 as shown in FIG. In the slot removal station S5, a predetermined number of divided teeth 6 are formed around the opening 13 by punching out a predetermined number of slots 14 around the opening 13 positioned in the center of the annularly divided divided core pieces 10. (Slot removal process).

  After the slot removing station S5, the work plate W is sequentially fed to the inner diameter removing station S6 as shown in FIG. In the inner diameter removing station S6, the tip side (inner diameter side) of each divided tooth 6 is formed by punching (inner diameter removing step).

  After the inner diameter removing station S6, the work plate W is sequentially fed to the first caulking part forming station S7 to the third caulking part forming station S9 as shown in FIGS. In the first caulking part forming station S7, the through hole 16 that becomes the discard hole of the caulking part 15 is formed by punching. Next, in the second crimping portion forming station S8, only the divided core pieces 10 arranged in the lowermost layer of the respective cores 1 are removed from the portions corresponding to the claw portions of the crimping portions 15 and the through holes 17 are formed. Punching forming. Thereafter, in the third crimping portion forming station S9, the crimping portion 15 is formed so that the inner wall of the through-hole 16 forms the tip of each of the split core pieces 10 other than the lowermost split core piece 10 of each skin iron core 1. The claw portion 18 is bent into a predetermined shape.

  After the third caulking portion forming station S9, the processed plate W passes through an idle station S10 where no processing is performed, and is forwarded to the caulking coupling station S11 with no outer diameter as shown in FIG. In the caulking coupling station S11 with the outer diameter removed, the outer diameter of each divided core piece 10 is punched out. Thereby, each division | segmentation iron core piece 10 adjacent to cyclic | annular form is isolate | separated. Moreover, in this caulking coupling station S11 without outer diameter, the formed divided core pieces 10 are overlapped with the previously formed divided core pieces 10 and are joined together by the respective caulking portions 15 (caulking laminating step). In this way, in the caulking coupling station S11 without outer diameter, the divided laminated cores 4 are manufactured by stacking a predetermined number of the divided core pieces 10 while punching the individual divided core pieces 10 and then caulking them together. A laminated core 1 in which a predetermined number of divided laminated cores 4 are connected in an annular shape is manufactured.

  Thereafter, the laminated core 1 is taken out from the progressive die apparatus and separated into individual divided laminated cores 4. Each of the divided laminated iron cores 4 is wound around the divided teeth 6 and then connected in an annular shape again to be assembled as a stator of the electric motor.

  The divided laminated iron core 4 manufactured in this way is formed by shearing and separating the joining lines of the iron core piece connecting portions 11A and 11B continuously arranged on the work plate W, and is therefore aligned when connected. Therefore, it is possible to manufacture a laminated core 1 that is excellent in properties and therefore excellent in shape accuracy.

Here, for example, when an acute shear tool 101 as shown in FIG. 18 is used, the tooth shape 103 of the shear tool 101 is cut into the material 102 as shown in FIG. 19, and the material is plastically deformed. The cut surface cut by shearing tool 101, as shown in FIG. 20, arises because tooth profile 103 inclined shear tool 101 is doing an inclined portion t _a which is transferred, the shearing in one direction Shear a Department _{t b} and inclined breaks _{t c,} the burr _{t d} is formed. When stacked with the burr t _d has occurred, as shown in FIG. 21, the dimensional difference γ occurs if the dimension in the stacking direction are different in the coupling portion 105, and the like stacked inclined stacking accuracy is lowered. In addition, a space 106 is generated in the connecting portion.

  Also, when shearing and separating the core piece connecting portions of the thin plate material, if bending is performed to a thickness greater than the plate thickness of the plate material, bending strain as plastic strain is likely to occur as shown in FIG. When performing, there is a possibility that it will not be reliably restored by springback. Furthermore, a slight reduction in the thickness of the bent portion 106 occurs due to bending strain. This decrease causes an elongation δ of the material toward the free cutting end by the law of constant volume. Even if it is attempted to return the extended cut and bent portion 107 to the same level, it is extremely difficult to restore it to its original state. Have difficulty. Such a malfunction due to plastic deformation such as the elongation δ and the generation of the space 106 becomes a factor that causes a decrease in magnetic performance as the iron core when the iron core is formed.

  However, according to the present embodiment, in the half punching bending process, because it is not completely punched, a fracture surface with low accuracy that is unstablely formed by punching, burrs are not formed, and most of the half punched cross section is Molded with high precision shearing surface. Further, since only approximately half of the plate thickness t is bent, the amount of bending strain is about half that of the case where bending is performed beyond the plate thickness. Accordingly, the thickness of the bent portion 30 is reduced, and the stress for trying to stretch the bent portion 30 according to the law of constant material volume is also reduced by about half, so that the size of the bent portion 30 is effectively maintained. Furthermore, since almost half of the material is not yet sheared in the half punching process, it can be returned with extremely high accuracy in the first pushback process of the next process. And it is completely cut by the reverse half punch bending process that punches and bends about half of the plate thickness in the opposite direction to the half punch direction, but most of this cut surface is completely cut with a high precision shear surface. It is possible to punch. That is, in the reverse half blanking process, only approximately half of the plate thickness t is bent, so that the bending strain amount and elongation are not easily generated, and a highly accurate shear surface is formed. In addition, a slight fracture surface may occur in order to completely punch in the reverse half punching bending process, but since a shearing surface has already been formed in the punching direction in which the fracture surface is formed in the punching bending process. Then, it is only molded at the center in the thickness direction of the work plate W. Therefore, since the fracture surface with low accuracy is not formed on the outer side (surface side) in the thickness direction of the workpiece plate W, extremely accurate machining is possible. And since a burr | flash is not formed in the thickness direction outer side (surface side) of the to-be-processed board W, it can suppress that a lamination | stacking precision falls, for example like FIG.

  Further, according to the present embodiment, in the half blanking process, the workpiece plate W is half blanked while being sandwiched between the half blank punch die 22 and the half blank backup die 25, and in the reverse half blank bending process, the workpiece W is processed. Is punched between the reverse half punch punch die 36 and the reverse half punch backup die 38. Therefore, half-punching shearing and reverse half-punching can be performed while suppressing a force to be deformed by a bending moment generated during half-punching shearing and reverse half-pushing shearing, and the shape of the shear plane is extremely stable. Further, in the half blanking process and the reverse half blanking process, the workpiece surface W is sandwiched between planes perpendicular to the shearing direction, so that a shear plane perpendicular to the surface can be obtained extremely stably. Furthermore, since the bending amount when the core piece connecting portions 11A and 11B of the thin plate material are shear-separated from each other is equal to or less than the plate thickness, plastic deformation hardly occurs. For these reasons, it is difficult to create a space when stacking the laminated core pieces that have been molded, and it is difficult for the thickness of the laminate to change. Is done.

  Further, in both the half blanking process and the reverse half blanking process, only a half of the plate thickness t is punched out, so that the burden such as tool wear is reduced and the life of the apparatus is improved.

Second Embodiment
FIG. 13 is a cross-sectional view for explaining a first operation based on the method for manufacturing a laminated core according to the second embodiment of the present invention, and FIG. 14 is a cross-sectional view for explaining a second operation based on the manufacturing method. 15 is a sectional view for explaining a third operation based on the manufacturing method, FIG. 16 is a sectional view for explaining a fourth operation based on the manufacturing method, and FIG. 17 is based on the manufacturing method. It is sectional drawing for demonstrating 5th operation | movement.

  The manufacturing method of the laminated core 1 according to the second embodiment of the present invention includes processing corresponding to the half-punch process, the first pushback process, and the reverse half-punch process in the method for manufacturing the laminated core according to the first embodiment. This is performed by one reciprocation of the mold at one station. In addition, since it is the same as that of the manufacturing method of the laminated core which concerns on 1st Embodiment after a 2nd pushback process, description is abbreviate | omitted.

  The manufacturing apparatus 50 for carrying out the method for manufacturing a laminated core according to the present embodiment has a progressive die having a drawing station S1 ′ for performing processing corresponding to the stations S1 to S3 in the first embodiment at a time. Device. Accordingly, the bending station S1 'is arranged in line with the same stations S4 to S11 as in the first embodiment.

  The upper die of the punching / bending station S <b> 1 ′ is provided with a stripper plate 51 and a punch die 53 slidably provided in the accommodating portion 52 of the stripper plate 51 and urged by the first spring 54. The punch die 53 protrudes from the stripper plate 51 approximately half (t / 2) of the thickness t of the divided core piece 10. The lower die of the bending station S1 ′ includes a die 56 biased by the second spring 55, and a backup die 59 slidably provided in the housing portion 57 of the die 56 and biased by the third spring 58. And are provided. The backup mold 59 and the die 56 are disposed flush with each other.

  A die stopper 60 is provided on the side (retracted side) urged by the second spring 55 of the die 56 so as to be spaced from the die 56, and the retreat of the die 56 is restricted within a predetermined interval. A backup type stopper 61 is also provided on the side (backward side) urged by the third spring 58 of the backup type 59 so as to be spaced from the backup type 59, so that the backup type 59 moves backward within a predetermined interval. Is regulated. Here, the interval between the backup die 59 and the backup die stopper 61 is set to be narrower than the interval between the die 56 and the die stopper 60, and the difference is approximately half the plate thickness t of the divided core piece 10 ( t / 2). Further, the first spring 54 that biases the punch die 53 is higher in rigidity than the third spring 58 that biases the backup die 59, and more than the punched through the work plate W held by the backup die 59. High rigidity.

  The punch die 53 is formed with a half-cut shear blade 62A at the edge along the cut line L, and a half-cut appropriately having a predetermined curvature R5 at the edge opposite to the side where the half-cut shear blade 62A is provided. A curved portion 63A is formed. In the accommodating portion 52 of the stripper plate 51, a reverse half punched shear blade 64A is formed at an edge along the cut line L, and a predetermined curvature is provided at an edge opposite to the side where the reverse half punch shear blade 64A is provided. A reverse half punched curved portion 65A having R6 as appropriate is formed.

  The die 56 is formed with a half punched shear blade 62B at an edge along the cut line L, and a half punched curve having a predetermined curvature R7 as appropriate at the edge opposite to the side where the half punched shear blade 62B is provided. A portion 63B is formed. The back-up mold 59 has a reverse half-cut shear blade 64B formed at the edge along the cut line L, and has a predetermined curvature R8 on the edge opposite to the side where the reverse half-cut shear blade 64B is provided. A reverse half punched curved portion 65B is formed.

  Next, the manufacturing method of the laminated iron core 1 which concerns on this embodiment is demonstrated.

  When the workpiece plate W is sequentially fed to the punching and bending station S1 ′, the upper die is brought close to the lower die and the workpiece plate W is sandwiched between the punch die 53 and the backup die 59 as shown in FIG. . Thereafter, when the upper die is further lowered as shown in FIG. 15, the rigidity of the first spring 54 that urges the punch die 53 is greater in the backup die 59 than the third spring 58 that urges the backup die 59. Since it is high enough to punch through the held work plate W, the punch die 53 retracts the backup die 59, and the work plate W is half-cut by the half-punching shear blades 62A and 62B to form a half-cut portion 67. The lower surface of the stripper plate 51 is in contact with the workpiece plate W. The backup mold 59 is pushed in until it comes into contact with the backup mold stopper 61. The half-punch amount X at this time is approximately half (t / 2) of the plate thickness t of the divided core piece 10 that is the amount of protrusion of the punch die 53 with respect to the stripper plate 51. Note that the half punching amount X does not necessarily have to be approximately half the plate thickness (t / 2), as long as the two continuous core core connecting portions 11A and 11B are maintained and partially punched. Good. Therefore, the protrusion amount of the punch die 53 from the stripper plate 51 may not be substantially half (t / 2) of the plate thickness t.

  Thus, by half-punching while sandwiching the work plate W between the punch die 53 and the half-punch backup die 59, half-punch shearing can be performed while suppressing the force to be deformed due to a bending moment generated during half-punch shearing. The effect that the shape of the shear plane is extremely stable is obtained.

  Further, by sandwiching the work plate W with a plane perpendicular to the shear direction, a shear plane perpendicular to the shear direction can be obtained extremely stably.

  Since the punch die 53 and the die 56 are respectively formed with half-bending curved portions 63A and 63B, a free space is appropriately formed around the bending portion 66 that is bent during the half-bending bending process. 66 can be formed.

  Thereafter, when the upper die is further lowered, as shown in FIG. 16, the lowering of the backup die 59 is restricted by the backup die stopper 61, but the die 56 is pushed down by the stripper plate 51. The portion 11A is pushed back until it is flush with the work plate W. When the upper die is further lowered, as shown in FIG. 17, the work plate W is pushed down by the stripper plate 51 while the lowering of the die 56 is restricted, and the core piece connecting portion 11A is half-removed. As a result, the reverse half punched portion 68 is formed. Since the cut line L is already half-cut and partially cut, the reverse half-cut portion 68 penetrates completely. The punch die 53 and the backup die 59 in the vicinity of the reverse half-cut shear blades 64A and 64B have a planar shape perpendicular to the shear direction, and the reverse half of the work plate W is sandwiched between the punch die 53 and the backup die 59. Punching and bending. The reverse half-drawing amount Y at this time corresponds to the protrusion amount of the backup mold 59 from the die 56 when the die 56 reaches the die stopper 60, and can be set by the height of the die stopper 60 and the backup mold stopper 61. It is approximately half (t / 2) of the thickness t of the iron core piece 10. Note that the reverse half punching amount Y does not necessarily have to be approximately half the plate thickness (t / 2), as long as the workpiece plate W can be completely punched and penetrated.

  As described above, in the reverse half blanking process of the blanking station S1 ′, the punch mold 53, the die 56, the stripper plate 51, and the backup mold 59 in the half blanking process are respectively a backup mold, a stripper plate, a die, And functions as a punch mold.

  In this way, by performing reverse half punching while sandwiching the work plate W between the punch die 53 and the backup die 59, reverse half punch shearing while suppressing the force to be deformed due to a bending moment generated during reverse half punch shearing. It is possible to obtain an effect that the shape of the shear plane is extremely stable.

  Further, by sandwiching the work plate W with a plane perpendicular to the shear direction, a shear plane perpendicular to the shear direction can be obtained extremely stably.

  In addition, the back-up mold 59 and the stripper plate 51 are formed with reverse half-bending curved portions 65A and 65B, respectively, so that a free space is appropriately formed around the reverse bending portion 69 during reverse half-bending bending. Thus, the reverse bending portion 69 can be formed.

  After this, as in the first embodiment, the work plate W is forwarded to the second pushback station S4, and the reversely bent core piece connecting portion 11A is pushed back so as to be flush with the work plate W. Furthermore, it is sequentially fed to the stations S5 to S11 for processing. In addition, since it is the same as that of the manufacturing method of the laminated core 1 which concerns on 1st Embodiment after a 2nd pushback process, description is abbreviate | omitted.

  According to the method for manufacturing the laminated core 1 according to the second embodiment, the processing corresponding to the half-bending step, the first pushback step, and the reverse half-bending step in the method for manufacturing the laminated core 1 according to the first embodiment. This can be implemented by one reciprocating movement of the mold at one station S1 ′, and the working efficiency can be improved. Further, since the half blanking process and the reverse half blanking process can be performed while being sandwiched between the punch mold 53 and the backup mold 59, the machining positions of the half blanking part 67 and the reverse half blanking part 69 are not shifted. The effect that the shape of the shear plane is extremely stable is obtained.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in the first embodiment, the reverse half punching process may be performed after the half punching process without providing the first pushback process. In this case, the core piece connecting portions 11A and 11B of the processed plate W are mutually connected by half-removing them in the reverse direction without pushing back the core piece connecting portions 11A of the half-worked plate W. Separate by shear. Further, in the first embodiment, the reverse half punching process and the second pushback process may be omitted. At this time, after the work plate W is half-punched by the half-bending bending process, the work piece plate W is pushed back until the core piece connecting portion 11A is flush with the work plate W in the first pushback process. The core piece connecting portions 11A and 11B are shear-separated from each other. That is, the first pushback process functions as a reverse half blanking process. Therefore, it is preferable to set the half blanking amount X of the work plate W in the half blanking step so that the iron core piece connecting portions 11A and 11B are sheared and separated in the first pushback step.

It is a top view which shows the laminated core manufactured by 1st Embodiment of the manufacturing method of the laminated core which concerns on this invention. It is a perspective view which shows one of the division | segmentation iron cores which comprise the same laminated iron core. It is a perspective view which shows one of the division | segmentation iron core pieces which comprise the division | segmentation iron core. It is a top view which shows an example of the material removal in the manufacturing method of the laminated iron core which concerns on this embodiment. It is a top view which shows the to-be-processed board arrange | positioned at station S1 and S2 of the manufacturing apparatus. It is a top view which shows the to-be-processed board arrange | positioned at stations S3-S5 of the manufacturing apparatus. It is a top view which shows the to-be-processed board arrange | positioned at stations S6-S8 of the manufacturing apparatus. It is a top view which shows the to-be-processed board arrange | positioned at stations S9-S11 of the manufacturing apparatus. It is sectional drawing which shows the type | mold structure of the half punching bending station S1 of the manufacturing apparatus which concerns on this embodiment, (A) is before mold clamping, (B) is in the middle of mold clamping, (C) shows after mold clamping. It is sectional drawing which shows the type | mold structure of 1st pushback station S2 of the manufacturing apparatus, (A) is before mold clamping, (B) is in the middle of mold clamping, (C) shows after mold clamping. It is sectional drawing which shows the type | mold structure of 2nd pushback station S3 of the manufacturing apparatus, (A) is before mold clamping, (B) is in the middle of mold clamping, (C) shows after mold clamping. It is sectional drawing which shows the type | mold structure of the reverse half punch bending station S4 of the manufacturing apparatus, (A) is before mold clamping, (B) is in the middle of mold clamping, (C) shows after mold clamping. It is sectional drawing for demonstrating the 1st operation | movement based on the manufacturing method of the laminated iron core which concerns on 2nd Embodiment of this invention. It is sectional drawing for demonstrating the 2nd operation | movement based on the manufacturing method. It is sectional drawing for demonstrating the 3rd operation | movement based on the manufacturing method. It is sectional drawing for demonstrating the 4th operation | movement based on the manufacturing method. It is sectional drawing for demonstrating the 5th operation | movement based on the manufacturing method. It is sectional drawing which shows the example of a shearing process by another manufacturing apparatus, (A) shows before a process and (B) shows after a process. It is a fragmentary sectional view of the to-be-processed board processed with the other manufacturing apparatus. It is the fragmentary sectional view which expanded the shearing part of the to-be-processed board processed with the other manufacturing apparatus. It is a fragmentary sectional view which shows the time of laminating | stacking the to-be-processed board processed with the other manufacturing apparatus. It is a fragmentary sectional view of the to-be-processed board punched and bent by other manufacturing apparatuses.

Explanation of symbols

1 laminated iron core,
4 split laminated iron core,
7A, 7B connecting part,
10 core pieces,
11A, 11B Iron core piece connection part,
20 manufacturing equipment,
21 half-stripped stripper plate,
22 half punch punch type,
23 half die,
25 half-out backup type,
26A, 26B, 62A, 62B half punched shear blade,
27A, 27B, 63A, 63B, half-bent curved portion,
30, 66 bends,
34 Reverse half punch stripper plate,
35 Reverse half die,
36 Reverse half punch punch type,
38 Reverse half-out backup type,
39A, 39B, 64A, 64B Reverse half punched shear blade,
40A, 40B, 65A, 65B Reverse half-bending curved portion,
43,69 Reverse bending part,
51 stripper plate,
53 Punch type,
54 first spring,
55 Second spring,
56 dies,
58 Third spring,
59 Backup type,
60 die stopper,
61 Backup type stopper,
L score line,
t thickness,
W work plate,
X half blanking amount,
Y Reverse half pull amount.

Claims (32)

A method of manufacturing a laminated core in which a predetermined number of divided cores formed by laminating a predetermined number of divided core pieces are connected to each other in a direction intersecting the stacking direction and formed into an annular shape,
From the work plate in which the pair of core pieces connected to each other of the divided core pieces adjacent to each other in the circumferential direction are continuously arranged, while maintaining the continuity of the pair of core pieces, A half punching process for pressing one side in the thickness direction and partially punching, and forming a bent portion bent in the punching direction;
One core piece connecting part punched partially in the half punching process is pressed to the opposite side to the punching direction to punch out the pair of core piece connecting parts to be discontinuous, and the bending part is opposite. A method of manufacturing a laminated iron core, comprising: a reverse half-bending bending step of bending sideways.   2. The reverse half punching and bending step includes pressing one core piece connecting portion partially punched in the half punching and bending step to the opposite side of the surface of the plate to be processed. The manufacturing method of the laminated iron core of description.   2. The reverse half punching and bending step includes pressing one core piece connecting portion partially punched in the half punching and bending step until it coincides with a surface of the plate to be processed. Manufacturing method of laminated iron core. Before the reverse half punching process, one core piece connecting part punched partially in the half punching process, while maintaining the continuity of the pair of core piece connecting parts, A first pushback step of pressing until they match,
After the reverse half punching step, the second core piece connecting portion punched until the pair of core piece connecting portions becomes discontinuous in the reverse half punching step is pressed until it matches the surface of the work plate. The method for manufacturing a laminated core according to claim 2, further comprising a pushback step.   In the half punching bending step, when half punching is performed by a pair of half punch punch dies and a half punch die, the half punch backup die and the half punch disposed in the housing portion facing the half punch punch die of the half punch die 5. The core piece connecting portion is half-cut by a half-punching shear blade at an edge of the half-punch punch die and the half-punch die while sandwiching the work plate with a punch punch die. The manufacturing method of the laminated iron core of any one of these.   6. The method of manufacturing a laminated core according to claim 5, wherein the half-punched punch mold and the half-punched backup mold are in contact with the workpiece plate at a plane perpendicular to a punching direction formed in the vicinity of a punching site. .   A curved half-bending curved portion is provided at each of the edge portions corresponding to the bent portion of the half-punching punch die and the half-punching die, and the bending portion is used as the two half-bending portions in the half-bending bending step. It forms in the space between curved parts, The manufacturing method of the laminated iron core of Claim 5 or 6 characterized by the above-mentioned.   In the reverse half punching bending step, when reverse half punching is performed by a pair of reverse half punch punch dies and reverse half punch dies, the reverse half of the reverse half punch dies disposed in a housing portion facing the reverse half punch punch dies. The core piece connecting portion is half-punched by the reverse half-punching shearing blade of the reverse half-punching punch mold and the reverse half-punching die while sandwiching the work plate by the half-punching backup mold and the reverse half-punching punch mold. The manufacturing method of the laminated iron core of Claim 2 or 4 characterized by the above-mentioned.   9. The method of manufacturing a laminated core according to claim 8, wherein the reverse half punch punch die and the reverse half punch backup die are in contact with the workpiece plate at a plane perpendicular to the punching direction.   In the reverse half punching die, a reverse half punching curved portion having a curved shape is provided at the opposite edge of the reverse half punching shearing blade, and the edge opposite to the reverse half punching shearing blade in the housing portion of the reverse half punching die A reverse half-bending curved portion having a curved shape is provided at the part, and a reverse bending portion formed by bending in the punching direction at one of the partially punched iron core connecting portions in the reverse half-punching bending step The method for manufacturing a laminated core according to claim 8, wherein the laminated core is formed in a space between the two reverse half-bent curved portions.   The reverse half-bending step is performed at the same station as the half-bending step, and is disposed in a punch die, a die, a stripper plate, and a receiving portion facing the punch die used in the half-bending step. The laminated iron core according to any one of claims 1 to 4, wherein the backup die to be used functions as a backup die, a stripper plate, a die, and a punch die in the reverse half punch bending process. Method.   The method for manufacturing a laminated core according to claim 11, wherein the half-bending step and the reverse half-bending step are performed while the work plate is sandwiched between the punch die and the backup die.   13. The method of manufacturing a laminated core according to claim 12, wherein the punch die and the backup die are in contact with the workpiece plate at a surface perpendicular to a punching direction formed in the vicinity of a punching site.   The edge corresponding to the bent portion in the punch die, die, stripper plate, and backup die is formed with a curved portion having a curvature shape, and during the half blanking step and the reverse half blanking step, The method for manufacturing a laminated core according to any one of claims 11 to 13, wherein the bent portion is formed in a space between the curved portions.   The punch die is biased by a first spring, the die is biased by a second spring, the backup die is biased by a third spring, and the first spring is more rigid than the third spring. In the half punching and bending step, the punch die biased by the first spring retreats the backup die biased by the third spring, and the workpiece plate held by the backup die is half The method for producing a laminated iron core according to any one of claims 11 to 14, wherein the laminated iron core is removed.   The back side of the backup mold is provided with a backup type stopper that regulates the back up of the backup mold by a predetermined distance, and after the halfway punching of the work plate by retreating the backup mold in the half blanking process In the reverse half-bending step, the workpiece held by the punch die while the punch die energized by the first spring is retracted by the backup die that is regulated to come back in contact with the backup die stopper. The method for producing a laminated core according to claim 15, wherein the plate is half-removed. An apparatus for manufacturing a laminated core in which a predetermined number of divided cores formed by laminating a predetermined number of divided core pieces are connected to each other in a direction intersecting with the stacking direction to form an annular shape,
From the work plate in which the pair of core pieces connected to each other of the divided core pieces adjacent to each other in the circumferential direction are continuously arranged, while maintaining the continuity of the pair of core pieces, A half punching station that presses one side in the thickness direction and partially punches, and forms a bent portion bent in the punching direction;
One core piece connecting part punched partially in the half punching process is pressed to the opposite side to the punching direction and punched until the pair of core piece connecting parts becomes discontinuous, and the bent part is on the opposite side. An apparatus for manufacturing a laminated iron core, comprising:   The reverse half punching and bending station presses one core piece connecting portion partially punched in the half punching and bending station to an opposite side from the surface of the processed plate. The manufacturing apparatus of the laminated iron core of description.   The reverse half punching and bending station presses one core piece connecting portion partially punched in the half punching and bending station until it coincides with the surface of the plate to be processed. Manufacturing equipment for laminated iron cores. Before the reverse half-bending bending station, one core piece connecting part partially punched in the half-bending bending station is connected to the surface of the workpiece plate while maintaining the continuity of the pair of core piece connecting parts. A first pushback station that presses until it matches,
After the reverse half punching and bending station, a second core piece connecting part punched until the pair of core piece connecting parts becomes discontinuous at the reverse half punching and bending station is pressed until it coincides with the surface of the work plate. The apparatus for manufacturing a laminated core according to claim 18, further comprising a pushback station.   The half punching bending station includes a half punch punch die and a half punch die having a half punch shear blade formed on an edge thereof, and a half punch housed in the half punch die and disposed to face the half punch punch die. The laminated iron core manufacturing apparatus according to any one of claims 17 to 20, characterized by comprising a backup mold.   21. The laminated core manufacturing apparatus according to claim 20, wherein the half-punched punch mold and the half-punched backup mold have a surface perpendicular to the punching direction in the vicinity of the part to be punched.   Curvature-shaped half-bending curved portions are formed in each of the edge portions corresponding to the bent portions of the half-punching punch die and the half-punching die, and when the half-punching die and the half-punching die are half-punched, 23. The laminated core manufacturing apparatus according to claim 21 or 22, wherein a space for accommodating the bent portion is formed between two half punched curved portions.   The reverse half punch bending station includes a reverse half punch punch die and a reverse half punch die each having a reverse half punch shear blade formed at each edge thereof, and an accommodation of the reverse half punch die facing the reverse half punch punch die. 21. The laminated iron core manufacturing apparatus according to claim 18 or 20, further comprising a reverse half punch backup type disposed in the section.   25. The laminated iron core manufacturing apparatus according to claim 24, wherein the reverse half punching die and the reverse half punching backup die have a surface perpendicular to the punching direction in the vicinity of the punching site.   Curvature-shaped reverse half punched curved portions are formed at the edges corresponding to the bent portions of the reverse half punch punch die and the reverse half punch die, respectively. 26. The laminated core manufacturing apparatus according to claim 24, wherein a space for accommodating the bent portion is formed between the two reverse half-bending curved portions when being drawn. The half blanking station and the reverse half blanking station are included in one blanking station,
A punch die formed with a half-cut shear blade at the edge and biased by a first spring;
A die formed with a half punched shear blade at the edge and biased by a second spring;
A stripper plate containing the punch mold;
A backup mold disposed opposite to the first punch mold and biased by a third spring;
A backup type stopper provided at an interval so as to come into contact with the backup mold when the backup mold is pushed and the workpiece plate is half-punched on the retreat side of the backup mold;
The first spring is higher in rigidity than the third spring, and the punch die biased by the first spring is held by the backup die while retreating the backup die biased by the third spring. The laminated iron core manufacturing apparatus according to claim 17 or 18, wherein the processed plate is half-punched.   28. The die stopper according to claim 27, further comprising a die stopper provided on the receding side of the die so as to contact the die when the die is pushed and the work plate is half-removed. Manufacturing equipment for laminated iron core.   29. The laminated core manufacturing apparatus according to claim 27 or 28, wherein reverse stripped shear blades are formed at edges of the stripper plate and the backup mold.   30. The laminated core manufacturing apparatus according to any one of claims 27 to 29, wherein the punch mold and the backup mold have a surface perpendicular to a punching direction formed in the vicinity of a punching site.   A curved half-bent curved part is formed in each of the edge portions corresponding to the bent part of the punch die and the die, and the half-bent curved part is formed between the two half-bent curved parts when the punch die and the die are half cut. The space for accommodating the said bending part is formed, The manufacturing apparatus of the laminated core of any one of Claims 27-30 characterized by the above-mentioned.   Curvature-shaped reverse half punched curved portions are formed at each of the edges corresponding to the bent portions of the backup mold and stripper plate, and the two reverse half punches are formed when the backup mold and stripper plate are reversely half punched. The space for accommodating the said bending part is formed between bending parts, The manufacturing apparatus of the laminated core of any one of Claims 27-31 characterized by the above-mentioned.

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