Method for manufacturing laminated iron core and apparatus for manufacturing laminated iron core

Abstract

A method for manufacturing a laminated iron core includes setting a blanking position on a strip-shaped workpiece for iron core pieces each including a yoke piece part having a linear shape and a magnetic pole piece part extending from the yoke piece part, such that a pair of iron core pieces are opposed each other and the magnetic pole piece part of one iron core piece is arranged between adjacent magnetic pole piece parts of the other iron core piece among the pair of iron core pieces, simultaneously blanking a front end side of the magnetic pole piece part and a back surface side of the yoke piece part of the one iron core piece from the strip-shaped workpiece before simultaneously blanking those of the other iron core piece from the strip-shaped workpiece, and blanking the iron core pieces from the strip-shaped workpiece.

Claims

1. A method for manufacturing a laminated iron core, comprising: setting a blanking position on a sheet of workpiece material for a plurality of iron core pieces, and each of the plurality of iron core pieces including a yoke piece part having a linear shape and magnetic pole piece parts extending from the yoke piece part, such that a pair of iron core pieces, among the plurality of iron core pieces, are located opposed to each other and respective ones of the magnetic pole piece parts of a first iron core piece, from the pair of iron core pieces, are arranged between respective adjacent ones of magnetic pole piece parts of a second iron core piece, from the pair of iron core pieces; simultaneously blanking a front end side of the magnetic pole piece parts and a back surface side of the yoke piece part of the first iron core piece such that the first iron core piece is partially blanked from the sheet of workpiece material before simultaneously blanking a front end side of the magnetic pole piece parts and a back surface side of the yoke piece part of the second iron core piece such that the second iron core piece is partially blanked from the sheet of workpiece material; and then blanking the plurality of iron core pieces, which includes the first iron core piece and the second iron core piece, such that the plurality of iron core pieces is completely separated from the sheet of workpiece material; after blanking, laminating two or more of the plurality of iron core pieces together to form the laminated iron core.

2. The method for manufacturing the laminated iron core according to claim 1, wherein each of the plurality of iron core pieces is an elongated iron core piece having the linear yoke piece part, and the laminated iron core is formed by laminating the elongated iron core pieces and then annularly bending the elongated iron core pieces.

3. The method for manufacturing the laminated iron core according to claim 1, wherein each of the plurality of iron core pieces is an elongated iron core piece having the linear yoke piece part, and the laminated iron core is formed by laminating while annularly winding the elongated iron core pieces.

4. The method for manufacturing the laminated iron core according to claim 1, wherein each of the plurality of iron core pieces includes a plurality of divided iron core pieces, and the laminated iron core is formed by laminating and arranging the plurality of divided iron core pieces annularly.

5. The method for manufacturing the laminated iron core according to claim 1, wherein a part of the back surface side of the yoke piece part of each of the plurality of iron core pieces is blanked such that a non-blanked portion remains, and the remaining non-blanked portion of the back surface side of the yoke piece part is subsequently blanked when completely separating each of the plurality of iron core pieces from the workpiece.

6. The method for manufacturing the laminated iron core according to claim 1, wherein the pair of iron core pieces are sequentially blanked in a state where a longitudinal direction of each of the plurality of iron core pieces is aligned with a direction orthogonal to a conveyance direction of the sheet of workpiece material.

7. The method for manufacturing the laminated iron core according to claim 1, wherein the pair of iron core pieces are sequentially blanked in a state where a longitudinal direction of each of the plurality of iron core pieces is aligned with a direction different from a direction orthogonal to a conveyance direction of the sheet of workpiece material.

8. The method for manufacturing the laminated iron core according to claim 1, further comprising: blanking (i) a portion between lateral parts of the magnetic pole piece parts of the first iron core piece, which are adjacent each other and (ii) blanking a portion between lateral parts of the magnetic pole piece parts of the second iron core piece, which are adjacent each other, before blanking the front end side of the magnetic pole piece parts and the back surface side of the yoke piece part of each of the plurality of iron core pieces.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the accompanying drawings:

(2) FIG. 1 is an explanatory diagram of a method for manufacturing a laminated iron core according to one embodiment of the present invention;

(3) FIG. 2 is an explanatory diagram of a method for manufacturing the laminated iron core;

(4) FIG. 3 is an explanatory diagram of a method for manufacturing a laminated iron core according to another embodiment of the present invention;

(5) FIG. 4 is an explanatory diagram of a method for manufacturing a laminated iron core according to a related example; and

(6) FIG. 5 is an schematic diagram of an apparatus for manufacturing a laminated iron core according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

(7) Subsequently, an embodiment of the present invention will be described with reference to the accompanying drawings, and the present invention will be understood.

(8) First, a laminated iron core manufactured by a method for manufacturing the laminated iron core according to one embodiment of the present invention will be described with reference to FIGS. 1 and 2.

(9) The laminated iron core is a stator iron core (or simply referred to as stator) used in an inner rotor type.

(10) This laminated iron core is formed by laminating a plurality of sets of a pair of (paired) iron core pieces 10, 11.

(11) Each of the iron core pieces 10, 11 is blanked and formed from a strip-shaped workpiece (thin metal sheet) 12 made of, for example, an amorphous material or an electromagnetic steel plate with a thickness of about 0.10 to 1.2 mm. In FIGS. 1 and 2, the width (the length of each of the iron core pieces 10, 11 in a longitudinal direction) of the strip-shaped workpiece 12 is narrowed and described for convenience of description.

(12) Concretely, each of the iron core pieces 10, 11 is a linear strip-shaped iron core piece having a linear yoke piece part 13 and a plurality of magnetic pole piece parts 18 extending from this yoke piece part 13. In the case of manufacturing the laminated iron core, the laminated iron core is formed by laminating a plurality of strip-shaped iron core pieces 10 and a plurality of strip-shaped iron core pieces 11 formed in linear shapes and then respectively annularly folding laminated bodies (strip-shaped laminated iron cores) of the strip-shaped iron core pieces 10 and the strip-shaped iron core pieces 11 and laminating the two laminated bodies. In addition, when the length of the iron core piece (strip-shaped iron core piece) is short, the laminated iron core can also be formed by respectively semi-circularly folding the laminated bodies (strip-shaped laminated iron cores) of the two strip-shaped iron core pieces and annularly arranging the laminated bodies.

(13) Each of the iron core pieces 10, 11 is a piece blanked from one strip-shaped workpiece, but may be a piece blanked from plural (for example, two, or three or more) stacked strip-shaped workpieces.

(14) Also, the radial width of the yoke piece part 13 is equal, but may be partially narrowed.

(15) The iron core pieces 10 adjacent in a lamination direction and the iron core pieces 11 adjacent in the lamination direction are respectively mutually joined by caulking parts (caulking holes 34, 38, caulking projections 35, 39 described below), but can also be joined using any one or two or more of a resin (a thermosetting resin (for example, an epoxy resin) or a thermoplastic resin), an adhesive and welding.

(16) In addition, the plurality of iron core pieces forming the laminated iron core can have the following configuration.

(17) Each of the iron core pieces is a linear strip-shaped iron core piece having a linear yoke piece part and plural magnetic pole piece parts extending from this yoke piece part, and the length of the yoke piece part is long, and in the case of manufacturing the laminated iron core, the laminated iron core is formed by annularly winding and also laminating each of the strip-shaped iron core pieces formed in linear shapes.

(18) In this case, each of the iron core pieces is blanked from the strip-shaped workpiece in a state where the longitudinal direction of each of the iron core pieces is aligned with a conveyance direction of the strip-shaped workpiece.

(19) Also, each of iron core pieces 10a, 11a shown in FIG. 3 as another embodiment includes a plurality of divided iron core pieces 16, and has discontinuous divided yoke piece parts 15 of the divided iron core pieces 16. In the case of manufacturing the laminated iron core, the laminated iron core is formed by annularly arranging plural divided laminated iron cores constructed by laminating the divided iron core pieces 16 (.

(20) In addition, in each of the divided iron core pieces 16, one magnetic pole piece part 17 extends from one divided yoke piece part 15, but a plurality of magnetic pole piece parts may extend.

(21) The laminated iron core formed by laminating the iron core pieces 10, 11 has an annular yoke part and a plurality of magnetic pole parts connected integrally to an inner peripheral side of this yoke part.

(22) The yoke part and the magnetic pole parts are respectively formed of the laminated yoke piece parts 13 and the laminated magnetic pole piece parts 18 by laminating the plurality of iron core pieces 10, 11 having the yoke piece parts 13 and the plurality of magnetic pole piece parts 18. In addition, the magnetic pole piece part 18 is formed by blanking a slot 19 from the strip-shaped workpiece.

(23) FIG. 5 shows an apparatus 132 for manufacturing the laminated iron core according to one embodiment of the present invention. For example, the strip-shaped workpiece 12 is sequentially fed from a winding storage through a drawing apparatus 119, a correction apparatus 120 and a feeding apparatus 130 toward the apparatus 132 for manufacturing the laminated iron core. In the apparatus 132 for manufacturing the laminated iron core, the strip-shaped workpiece 12 is punched and blanked to produce the iron core pieces 10, 11 by using dies and punches of die units 131.

(24) Subsequently a method for manufacturing the laminated iron core according to one embodiment of the present invention will be described with reference to FIGS. 1 and 2.

(25) The method for manufacturing the laminated iron core is a method for forming the laminated iron core by conveying the strip-shaped workpiece 12 with a thickness of about 0.10 to 1.2 mm at a predetermined pitch using the apparatus 132 for manufacturing the laminated iron core and also blanking a plurality of sets of paired iron core pieces 10, 11 and sequentially laminating the iron core pieces 10, 11. The method includes steps A to K. In addition, the die units 131 are respectively arranged in each of the steps A to K, and the apparatus 132 for manufacturing the laminated iron core includes those die units 131.

(26) A blanking position on the strip-shaped workpiece 12 for the paired iron core pieces 10, 11 is set such that the yoke piece part 13 of each of the iron core pieces 10, 11 has a linear shape and the paired iron core pieces 10, 11 are opposed (opposed and arranged) and the magnetic pole piece part 18 of the other iron core piece 10 is mated and arranged between the adjacent magnetic pole piece parts 18 of one iron core piece 11.

(27) In addition, a pair of the iron core pieces 10, 11 is sequentially blanked from the strip-shaped workpiece 12 in a state where the longitudinal direction of each of the iron core pieces 10, 11 is aligned with a direction (a width direction of the strip-shaped workpiece 12) orthogonal to the conveyance direction of the strip-shaped workpiece 12.

(28) Hereinafter, detailed description will be made.

(29) (Step A)

(30) In the step A, pilot holes 20, 21 are blanked from the strip-shaped workpiece 12.

(31) Accordingly, the pilot holes 20 are formed in both sides of the strip-shaped workpiece 12 in the width direction and the pilot holes 21 are formed in the center of the strip-shaped workpiece 12 in the width direction at predetermined pitches, respectively. In addition, it is unnecessary to form the pilot hole 21, or the plurality of pilot holes 21 can also be spaced in the width direction of the strip-shaped workpiece 12 according to the width of the strip-shaped workpiece 12.

(32) (Step B)

(33) In the step B, narrow slits 22, 23 having a longitudinal direction same as the conveyance direction of the strip-shaped workpiece 12 are formed in both sides (insides from the pilot holes 20) of the strip-shaped workpiece 12 in the width direction.

(34) Accordingly, both sides of the strip-shaped workpiece 12 in the width direction are formed with one ends of the iron core pieces 10, 11 in the longitudinal direction.

(35) (Step C)

(36) In the step C, a region (a portion between the slits 22, 23, the same applies hereinafter) for forming the iron core pieces 10, 11 of the strip-shaped workpiece 12 is formed with plural paired slits 24, 25 at predetermined pitches in the width direction of the strip-shaped workpiece 12. This pair of slits 24, 25 is formed by blanking a portion between adjacent lateral parts of the magnetic pole piece part 18 of one iron core piece 11 and the magnetic pole piece part 18 of the other iron core piece 10 by a fourth die unit (not shown). In addition, the fourth die unit includes a fourth die and a fourth punch corresponding to contour shapes of the slits 24, 25.

(37) Accordingly, a side surface of the magnetic pole piece part 18 of each of the iron core pieces 10, 11 is formed in the width direction of the strip-shaped workpiece 12.

(38) Also, narrow slits 26, 27 are formed between the slits 22, 24 and between the slits 23, 24, respectively.

(39) Accordingly, both sides of the strip-shaped workpiece 12 in the width direction are formed with the other ends of the iron core pieces 10, 11 in the longitudinal direction.

(40) (Step D)

(41) In the step D, the region for forming the iron core pieces 10, 11 of the strip-shaped workpiece 12 is formed with a plurality of narrow slits 28 and blanked parts 29 in the width direction of the strip-shaped workpiece 12. The plurality of slits 28 and blanked parts 29 are formed by simultaneously blanking the front end side of the magnetic pole piece part 18 and the back surface side of the yoke piece part 13 of the iron core piece 11 by a first die unit (not shown). In addition, the first die unit includes a first die and a first punch corresponding to contour shapes of the slits 28 and the blanked parts 29.

(42) Here, the back surface side of the yoke piece part 13 is blanked at a distance in a longitudinal direction of the yoke piece part 13. In addition, the slit 28 formed by this blanking has the length ranging to a plurality of (about nine herein) magnetic pole piece parts 18.

(43) Accordingly, a back surface of the yoke piece part 13 of the iron core piece 11 is partially formed.

(44) Also, the front end side of the magnetic pole piece part 18 of the iron core piece 11 is blanked at a predetermined pitch in the width direction of the strip-shaped workpiece 12 so as to join the ends of a pair of the slits 24, 25 in the upstream side of the conveyance direction.

(45) Accordingly, a front end surface of the magnetic pole piece part 18 of the iron core piece 11 is formed and also, a slot 19 of the iron core piece 10 is formed.

(46) (Step E)

(47) In the step E, the region for forming the iron core pieces 10, 11 of the strip-shaped workpiece 12 is formed with a plurality of narrow slits 30 and blanked parts 31 in the width direction of the strip-shaped workpiece 12. The plurality of slits 30 and blanked parts 31 are formed by simultaneously blanking the front end side of the magnetic pole piece part 18 and the back surface side of the yoke piece part 13 of the iron core piece 10 by a second die unit (not shown) arranged in the side downstream from the first die unit. In addition, the second die unit includes a second die and a second punch corresponding to contour shapes of the slits 30 and the blanked parts 31.

(48) In addition, blanking of the back surface side of the yoke piece part 13 of the iron core piece 10 and blanking of the front end side of the magnetic pole piece part 18 are similar to those of the step D described above.

(49) Accordingly, a back surface of the yoke piece part 13 of the iron core piece 10 is partially formed and also, a front end surface of the magnetic pole piece part 18 of the iron core piece 10 and a slot 19 of the iron core piece 11 are formed.

(50) By arranging the fourth die unit in the upstream side from the first and second die units as described above, the portion between the adjacent lateral parts of the mated magnetic pole piece parts 18 of the iron core pieces 10, 11 can be blanked before the front end sides of the magnetic pole piece parts 18 and the back surface sides of the yoke piece parts 13 of the iron core pieces 10, 11 are blanked.

(51) Accordingly, the influence of expansion of the strip-shaped workpiece caused by blanking the portion between the adjacent lateral parts of the magnetic pole piece parts 18 on accuracy of a dimension ranging from the front end of the magnetic pole piece part 18 to the back surface of the yoke piece part 13 can be decreased.

(52) (Step F)

(53) In the step F, pilot holes 32, 33 are blanked from the strip-shaped workpiece 12.

(54) The pilot holes 32 are formed between the pilot holes 20 adjacent in the conveyance direction formed in both sides of the strip-shaped workpiece 12 in the width direction in the step A described above.

(55) Also, the pilot hole 33 is formed between (in the vicinity of the pilot hole 21 formed in the step A described above herein) a pair of the iron core pieces 10, 11 and a pair of the iron core pieces 10, 11 adjacent in the conveyance direction of the strip-shaped workpiece 12.

(56) Accordingly, the accuracy of the dimension in the case of blanking can be made higher.

(57) Simultaneously, the region for forming the iron core piece 11 of the strip-shaped workpiece 12 is formed with a caulking hole 34 in the iron core piece 11 used as the lowermost layer of a laminated body. In addition, the caulking hole 34 may be formed in a different step.

(58) (Step G)

(59) In the step G, the region for forming the iron core piece 11 of the strip-shaped workpiece 12 is formed with caulking projections 35 in the iron core pieces 11 used as layers other than the lowermost layer of the laminated body.

(60) (Step H)

(61) In the step H, non-blanked parts 36, 37 left in the back surface side of the yoke piece part 13 in the case of forming the slit 28 in the step D described above are blanked. The non-blanked parts 36, 37 can be blanked by a third die unit (not shown) which is arranged in the downstream side from the first and second die units and includes a third die and a third punch.

(62) Accordingly, the iron core pieces 11 are separated from the strip-shaped workpiece 12 and also, the plurality of iron core pieces 11 formed with the caulking projections 35 can be sequentially caulked and laminated on the iron core piece 11 formed with the caulking hole 34 (the step of laminating the plurality of iron core pieces 11).

(63) (Step I)

(64) In the step I, the region for forming the iron core piece 10 of the strip-shaped workpiece 12 is formed with a caulking hole 38 in the iron core piece 10 used as the lowermost layer of a laminated body.

(65) (Step J)

(66) In the step J, the region for forming the iron core piece 10 of the strip-shaped workpiece 12 is formed with caulking projections 39 in the iron core pieces 10 used as layers other than the lowermost layer of the laminated body.

(67) (Step K)

(68) In this step, non-blanked parts 40, 41 left in the back surface side of the yoke piece part 13 in the case of forming the slit 30 in the step E described above are blanked. The non-blanked parts 40, 41 can be blanked by a die unit (not shown) with a configuration substantially similar to that of the third die unit used in the step H described above.

(69) Accordingly, the iron core pieces 10 are separated from the strip-shaped workpiece 12 and also, the plurality of iron core pieces 10 formed with the caulking projections 39 can be sequentially caulked and laminated on the iron core piece 10 formed with the caulking hole 38 (the step of laminating the plurality of iron core pieces 10).

(70) The laminated iron core can be manufactured by respectively annularly folding the laminated bodies (strip-shaped laminated iron cores) of the strip-shaped iron core pieces 10 and the strip-shaped iron core pieces 11 manufactured by the method described above and laminating the two laminated bodies.

(71) In addition, when each of the iron core pieces 10a, 11a includes plural divided iron core pieces 16 and has discontinuous divided yoke piece parts 15 of the divided iron core pieces 16 as shown in FIG. 3, the iron core pieces 10a, 11a are blanked from a strip-shaped workpiece by a method substantially similar to the method described above, with the result that steps C to E corresponding to the steps C to E described above will herein be described briefly. In addition, FIG. 3 describes a state where the adjacent divided iron core pieces 16 constructing each of the iron core pieces 10a, 11a are separated, but the adjacent divided iron core pieces 16 may abut.

(72) (Step C)

(73) In the step C, a region for forming the iron core pieces 10a, 11a of the strip-shaped workpiece is formed with a plurality of paired slits 42, 43 at predetermined pitches in a width direction of the strip-shaped workpiece. This pair of slits 42, 43 is formed by blanking a portion between adjacent lateral parts of a magnetic pole piece part 17 of one iron core piece 11a and a magnetic pole piece part 17 of the other iron core piece 10a.

(74) Accordingly, a side surface of the magnetic pole piece part 17 of each of the iron core pieces 10a, 11a is formed in the width direction of the strip-shaped workpiece.

(75) (Step D)

(76) In the step D, the region for forming the iron core pieces 10a, 11a of the strip-shaped workpiece is formed with a plurality of narrow slits 44 and blanked parts 45 in the width direction of the strip-shaped workpiece. The plurality of slits 44 and blanked parts 45 are formed by simultaneously blanking the front end sides of the magnetic pole piece parts 17 and the back surface sides of the plurality of divided yoke piece parts 15 of the iron core piece 11a.

(77) Here, the back surface side of the divided yoke piece part 15 is blanked at a distance 46a in a longitudinal direction of the divided yoke piece part 15. In addition, the slit 44 formed by this blanking has the length ranging to the adjacent magnetic pole piece parts 17.

(78) Accordingly, a back surface of the divided yoke piece part 15 of the iron core piece 11a is partially formed.

(79) Also, the front end side of the magnetic pole piece part 17 is blanked at a predetermined pitch in the width direction of the strip-shaped workpiece so as to join the ends of a pair of the slits 42, 43 in the upstream side of the conveyance direction.

(80) Accordingly, a front end surface of the magnetic pole piece part 17 of the iron core piece 11a is formed and also, a slot 19a of the iron core piece 10a is formed.

(81) (Step E)

(82) In the step E, the region for forming the iron core pieces 10a, 11a of the strip-shaped workpiece is formed with a plurality of narrow slits 47 and blanked parts 48 in the width direction of the strip-shaped workpiece. The plurality of slits 47 and blanked parts 48 are formed by simultaneously blanking the front end sides of the magnetic pole piece part 17 and the back surface sides of the plurality of divided yoke piece parts 15 of the iron core piece 10a.

(83) In addition, blanking of the back surface side of the divided yoke piece part 15 and blanking of the front end side of the magnetic pole piece part 17 are similar to those of the step D described above.

(84) Accordingly, a back surface of the divided yoke piece part 15 of the iron core piece 10a is partially formed and also, a front end surface of the magnetic pole piece part 17 of the iron core piece 10a and a slot 19a of the iron core piece 11a are formed.

(85) In addition, a gap 46 between the adjacent divided yoke piece parts 15 could be blanked before steps corresponding to the step H and the step K of FIG. 2.

(86) Also, when the gap 46 is absent, that is, the adjacent divided iron core pieces 16 abut, the adjacent divided yoke piece parts 15 are cut. This cutting method includes, for example, a method for depressing one divided yoke piece part 15 against the other divided yoke piece part 15 and cutting the divided yoke piece parts 15 and then pressing back and returning to the same plane. In addition, this cutting is preferably made in a step after (downstream from) the step E.

(87) As described above, the iron core piece can be blanked from the strip-shaped workpiece with good workability and high accuracy by using the method and the apparatus for manufacturing the laminated iron core according to the aspects of the present invention.

(88) The present invention has been described above with reference to the embodiment, but the present invention is not limited to the configuration described in the embodiment described above, and also includes other embodiments and modified examples contemplated within the scope of the matter described in the claims. For example, the case of constructing the method and the apparatus for manufacturing the laminated iron core of the present invention by combining a part or all of the respective embodiments and modified examples described above is also included in the scope of right of the present invention.

(89) The embodiment described above describes the case of applying the method and the apparatus for manufacturing the laminated iron core of the present invention to manufacture of the stator laminated iron core of the inner rotor type in which the rotor laminated iron core is arranged inside the stator laminated iron core so as to have a gap, but the method and the apparatus can also be applied to manufacture of a stator laminated iron core of an outer rotor type in which a rotor laminated iron core is arranged outside the stator laminated iron core so as to have a gap, and can also be applied to manufacture of a rotor laminated iron core.

(90) In the embodiment described above, a pair of the iron core pieces is blanked from the strip-shaped workpiece in the state in which the longitudinal direction of each of the iron core pieces is aligned with the direction orthogonal to the conveyance direction of the strip-shaped workpiece. However, the iron core pieces can also be blanked in a state in which the longitudinal direction of each of the iron core pieces is aligned with a direction different from the direction orthogonal to the conveyance direction of the strip-shaped workpiece, for example, the conveyance direction of the strip-shaped workpiece or an oblique direction with respect to the conveyance direction (for example, see Japanese Patent No. 4330420).

(91) Also, the steps other than the steps D (D) and the steps E (E) can be combined freely, and can be divided into a plurality of steps.

(92) Reference signs are listed as follows: 10, 10a. 11, 11a: IRON CORE PIECE 12: STRIP-SHAPED WORKPIECE 13: YOKE PIECE PART 15: DIVIDED YOKE PIECE PART 16: DIVIDED IRON CORE PIECE 17, 18: MAGNETIC POLE PIECE PART 19, 19a: SLOT 20, 21: PILOT HOLE 22 to 28: SLIT 29: BLANKED PART 30: SLIT 31: BLANKED PART 32, 33: PILOT HOLE 34: CAULKING HOLE 35: CAULKING PROJECTION 36, 37: NON-BLANKED PART 38: CAULKING HOLE 39: CAULKING PROJECTION 40, 41: NON-BLANKED PART 42 to 44: SLIT 45: BLANKED PART 46: GAP 46a: DISTANCE 47: SLIT 48: BLANKED PART 119: DRAWING APPARATUS 120: CORRECTION APPARATUS 130: FEEDING APPARATUS 131: DIE UNIT 132: APPARATUS FOR MANUFACTURING LAMINATED IRON CORE