JP2016197936A - Laminate having temporary caulking and manufacturing method therefor and manufacturing method of laminated iron core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate capable of removing a temporary caulking easily enough, when manufacturing a laminated iron core.SOLUTION: In a laminate for laminated iron core, a plurality of processed bodies having a temporary caulking are laminated and caulked by the temporary caulking. The processed body having a temporary caulking includes an opening, and a temporary caulking part provided in the opening and having the temporary caulking. The temporary caulking part has at least three crowns, and at least two crowns thereof constitute a fitting part for the opening.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a laminate having temporary crimping, a method for producing the laminate, and a method for producing a laminated iron core. In the present invention, caulking used to temporarily integrate a plurality of workpieces manufactured by punching is referred to as “temporary caulking”, and the product (laminated iron core) having the temporary caulking is provided. A portion removed from the processed body in the manufacturing process is referred to as a “temporary caulking portion”.

  A laminated iron core is a component of a motor, and is formed by stacking a plurality of electromagnetic steel sheets (processed bodies) processed into a predetermined shape and fastening them. The motor includes a rotor (rotor) and a stator (stator) made of laminated iron cores, and is completed through a process of winding a coil around the stator, a process of attaching a shaft to the rotor, and the like. A motor employing a laminated core is conventionally used as a drive source for a refrigerator, an air conditioner, a hard disk drive, an electric tool, and the like, and in recent years is also used as a drive source for a hybrid car.

  Caulking and welding are known as means for fastening electromagnetic steel sheets adjacent in the vertical direction in the process of manufacturing a laminated core. These fastening means are excellent in terms of cost and work efficiency, and have been widely used. On the other hand, when priority is given to the high torque and low iron loss of the motor, the electromagnetic steel sheets may be fastened using a resin material or an adhesive instead of caulking or welding.

  Patent Document 1 discloses a method of manufacturing a laminated core such as a motor core or a transformer core by joining a predetermined number of iron cores punched from a strip-shaped sheet material in a laminated state. FIG. 5 of Patent Document 1 shows a laminated iron core taken out from a mold. Paragraph [0016] of Patent Document 1 states that “This laminated iron core 14 is closed by a shaft hole thin plate portion 12 that is pushed back after a portion of the rotor shaft hole 16 is half-extracted as shown in FIG. The iron cores 21 adjacent in the vertical direction are temporarily fixed to each other by the caulking joint portion 17 provided in the thin plate portion 12 for shaft hole.

Japanese Patent No. 3523330

  In the invention described in Patent Document 1, relief holes 30 and 31 are provided in the shaft hole thin plate portion 12 as means for reducing the force required to remove the shaft hole thin plate portion 12. However, in a state where a large number of iron cores are laminated, it is not always easy to remove the shaft hole thin plate portion 12 (temporary caulking portion) from the laminated body, and a relatively large load may be applied to the laminated body. There was a need to prepare possible equipment.

  This invention is made | formed in view of the said subject, and when manufacturing a laminated iron core, providing the laminated body which can remove a temporary caulking part easily enough, its manufacturing method, and the manufacturing method of a laminated iron core Objective.

  The present invention relates to a laminated body for a laminated iron core in which a plurality of workpieces having temporary caulking are laminated and fastened together by temporary caulking. The processed body having temporary crimping is provided with an opening and a temporary crimping portion provided in the opening and having temporary crimping. The temporary crimping portion has at least three top portions, and at least two top portions of the top portions constitute a fitting portion with respect to the opening portion.

  According to the laminated body including the processed body having the above-described configuration, the temporary crimping portion can be removed sufficiently easily when the laminated iron core is manufactured. In the present invention, the top of the temporary crimping portion is fitted to the opening. Therefore, the temporary caulking portion is removed sufficiently easily as compared with the aspect in which the entire outer peripheral surface of the shaft hole thin plate portion 12 abuts against the inner peripheral surface of the rotor shaft hole 16 as in the invention described in Patent Document 1. Can do.

  The shape of the opening of the processed body may be a substantially polygonal shape having a plurality of corners, or may be a circle or an ellipse. The tip of the top portion of the temporary crimping portion provided in the opening may be formed at a position coinciding with the contour of the opening (see FIG. 7), or formed inside or outside the contour of the opening. (See FIGS. 8 and 9).

  The temporary crimping portion may have a constricted portion on the side surface in the vicinity of the top constituting the fitting portion (see FIG. 7C). For example, the mechanical strength of the temporary crimping portion can be adjusted by appropriately setting the depth of the constricted portion, and thereby the ease of removal of the temporary crimping portion from the opening can be adjusted. In addition, since the temporary crimping portion has a constricted portion at the above position, there is an advantage that burrs are hardly generated in the process of manufacturing the temporary crimping portion by punching. The “near the top” here means a range within 5 mm from the tip of the top.

  In order to make the fitting strength of the temporary crimping portion with respect to the opening equal to or higher than the required strength and to make it easy to remove the temporary crimping portion from the opening portion, the temporary crimping portion is a fitting for adjusting the strength of fitting with respect to the opening portion. You may have a combined strength adjustment part (refer FIG. 10).

The present invention provides a method for producing a laminated core from the above laminate having temporary crimping. That is, the method for manufacturing a laminated core according to the present invention includes the following steps.
(A) A step of punching a processed body having temporary crimping from a processed plate.
(B) A step of stacking a plurality of processed bodies and integrating them by temporary caulking.

This invention provides the method of manufacturing a laminated iron core from the laminated body which has the temporary crimping obtained by the said manufacturing method. That is, the method for manufacturing a laminated core according to the present invention includes the following steps.
(C) The process of fastening the laminated body manufactured by the said manufacturing method using resin material, welding, adhesion | attachment, or these together.
(D) The process of removing a temporary crimping part from a laminated body.
According to the method for manufacturing a laminated core according to the present invention, a laminated core without caulking can be finally obtained by removing the temporary caulking portion from the laminated body. Moreover, according to the said manufacturing method, a temporary crimping part can be removed easily enough in the said (d) process.

  ADVANTAGE OF THE INVENTION According to this invention, when manufacturing a laminated iron core, the laminated body which can remove a temporary caulking enough easily, its manufacturing method, and the manufacturing method of a laminated iron core are provided.

FIG. 1 is a perspective view showing an example of a rotor (rotor). FIG. 2 is a schematic cross-sectional view taken along the line II-II shown in FIG. FIG. 3 is a perspective view showing an embodiment of a laminated body with a temporary caulking portion for the rotor shown in FIG. FIG. 4 is a longitudinal sectional view schematically showing a temporary crimping block formed by stacking temporary crimping portions. FIG. 5 is a plan view showing the configuration of the temporary crimping portion shown in FIG. FIG. 6 is a schematic view showing an example of an apparatus for producing a laminate according to the present invention. FIGS. 7A and 7B are plan views showing the process of forming the temporary crimping portion shown in FIG. 5, respectively, and FIG. 7C is an enlarged view of the top portion (fitting portion) of the temporary crimping portion. FIG. FIGS. 8A and 8B are plan views respectively showing a process of forming a temporary crimping portion according to another embodiment. FIGS. 9A and 9B are plan views respectively showing processes of forming a temporary crimping portion according to another embodiment. FIGS. 10A and 10B are plan views showing examples of a temporary crimping portion having a fitting strength adjusting portion. FIGS. 11A and 11B are plan views respectively showing a process of forming a temporary crimping portion according to another embodiment. FIGS. 12A and 12B are plan views respectively showing the process of forming a temporary crimping portion according to another embodiment. FIGS. 13A and 13B are plan views respectively showing a process of forming a temporary crimping portion according to another embodiment. 14 (a) and 14 (b) are plan views respectively showing a process of forming a temporary crimping portion according to another embodiment.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same elements or elements having the same functions, and redundant description is omitted.

(Laminated core for rotor)
1 and 2 are a perspective view and a sectional view of a laminated core R for a rotor according to this embodiment. The shape of the laminated iron core R is a substantially cylindrical shape. The laminated core R is a laminated body 10 composed of a plurality of electromagnetic steel plates MR, a shaft hole 12 for inserting a shaft (not shown) located at the center of the laminated body 10, and a magnet for inserting a magnet. The insertion hole 15 is provided with a lightweight hole 18 formed between the shaft hole 12 and the magnet insertion hole 15. For convenience, FIG. 2 shows a laminate 10 made of a total of 15 electromagnetic steel plates MR, but the number of electromagnetic steel plates MR is not limited to this.

  The laminated iron core R has a total of 16 magnet insertion holes 15. Two adjacent magnet insertion holes 15 form a pair, and eight pairs of magnet insertion holes 15 are arranged at equal intervals along the outer periphery of the laminated core R. Each magnet insertion hole 15 extends from the upper surface to the lower surface of the laminated iron core R. The total number of the magnet insertion holes 15 is not limited to 16, but may be determined according to the use of the motor, the required performance, and the like. Further, the shape and position of the magnet insertion hole 15 may be determined according to the use of the motor, the required performance, and the like.

  A magnet (not shown) is accommodated in the magnet insertion hole 15. The magnet is a permanent magnet, and for example, a sintered magnet such as a neodymium magnet can be used. The number of magnets inserted into each magnet insertion hole 15 may be one or two or more. The type of magnet may be determined according to the application of the motor, required performance, and the like. For example, a bonded magnet may be used instead of the sintered magnet. Moreover, you may use the magnet divided | segmented into multiple in the thickness direction or the width direction, or both. After inserting the magnet of the magnet insertion hole 15, the magnet can be fixed in the magnet insertion hole 15 by filling the magnet insertion hole 15 with the resin material 16.

  As the resin material 16, for example, a thermosetting resin can be used. Specific examples of the thermosetting resin include a resin composition containing an epoxy resin, a curing initiator, and an additive. Examples of the additive include a filler, a flame retardant, and a stress reducing agent. The resin material 16 joins the electromagnetic steel plates MR adjacent in the vertical direction. Note that a thermoplastic resin may be used as the resin material 16. The resin material 16 (excluding the resin material used for the flux barrier portion) may include a magnetic material. When the resin material 16 contains a magnetic body, the content can be made into the range of 5-90 volume%. If the content of the magnetic substance in the resin material 16 is less than 5% by volume, the motor torque tends to decrease or cracks due to the difference in thermal expansion coefficient tend to occur. The workpieces are more electrically connected to each other, and the magnetic properties of the laminated iron core R tend to deteriorate due to this.

  The laminated iron core R has a total of eight lightweight holes 18 between the shaft hole 12 and the magnet insertion hole 15. The opening shape of the lightweight hole 18 is substantially triangular. The eight lightweight holes 18 are arranged along the circumferential direction of the shaft hole 12. More specifically, the eight lightweight holes 18 are arranged so as to have point symmetry with the central axis of the laminated iron core R as a symmetric point, and each lightweight hole 18 is rotated by 45 ° around the symmetric point. Are formed so as to coincide with each other. As shown in FIG. 2, each lightweight hole 18 is formed so as to penetrate from the upper surface to the lower surface of the laminated iron core R. In addition, the lightweight hole 18 may bring about the effect of cooling the laminated iron core R.

(Laminated body for rotor with temporary crimping)
FIG. 3 is a perspective view of the laminate 20 used for manufacturing the laminated core R. The stacked body 20 is formed by stacking a plurality of processed bodies WR. The laminated body 20 has a temporary crimping portion 8 at a position corresponding to the lightweight hole 18 in the laminated iron core R. The laminated iron core R described above is manufactured through a process of filling the resin insertion material 16 into the magnet insertion hole 15 of the laminated body 20 and a process of removing the temporary crimping portion 8 from the laminated body 20.

  FIG. 4 is a longitudinal sectional view schematically showing a temporary crimping block 8A in which the temporary crimping portions 8 are laminated. That is, FIG. 4 is a longitudinal sectional view in the radial direction of the laminate 20, and the left side of FIG. 4 is the inner peripheral side (axial hole 12 side) of the laminate 20, and the right side is the outer peripheral side. The temporary crimping portion 8 has a temporary crimping 8a formed at the center. Note that a through hole 8h is formed in the processed body WR forming the lowermost layer of the stacked body 20 instead of the temporary caulking 8a. This is to prevent the laminated body 20 to be manufactured next from being bonded to the already manufactured laminated body 20 by the temporary caulking 8a when the laminated body 20 is continuously manufactured.

  FIG. 5 is a plan view showing the configuration of the temporary crimping portion 8 included in each processed body WR (excluding the lowermost processed body WR shown in FIG. 4). As shown in this figure, the shape of the temporary crimping portion 8 is a substantially equilateral triangle, and the temporary crimping portion 8 has three apexes 8b. These top portions 8 b are fitted to the inner peripheral surface of the opening portion 22, and all three top portions 8 b form fitting portions with respect to the opening portion 22 in this embodiment. In the present embodiment, the shape of the opening 22 is also a substantially equilateral triangle.

  As described above, since the shapes of the temporary crimping portion 8 and the opening portion 22 are both substantially equilateral triangles, as shown in FIG. 5, the angle formed by the two sides 8c constituting the top portion 8b (the angle α in FIG. 5) is About 60 °. Further, the angle formed by the inner peripheral surface of the opening 22 and the side 8c of the temporary crimping portion 8 (angle β in FIG. 5) is also about 60 °. In addition, as long as the top part 8b of the temporary crimping part 8 is the aspect fitted to the internal peripheral surface of the opening part 22, the range of these angles (alpha) and (beta) may be 40-100 degrees, It is 30-120 degrees. There may be.

  The temporary crimping portion 8 is disposed so as to partition the opening 22 into three through holes 22a, 22b, and 22c. The shape of these through holes 22a, 22b, 22c is also a substantially equilateral triangle. The three corners of the through holes 22a, 22b, and 22c are rounded. Among the three through holes 22a, 22b, and 22c, a top portion 8b is formed between two adjacent through holes. In other words, the top portion 8b is formed through a process of punching the through holes 22a, 22b, and 22c from the work plate W (see FIG. 7).

  The temporary crimping portion 8 has a constricted portion 8d on the side surface in the vicinity of the top portion 8b constituting the fitting portion (see FIGS. 5 and 7C). By appropriately setting the depth of the constricted portion 8d, the mechanical strength of the temporary crimping portion 8 can be adjusted, whereby the ease of removing the temporary crimping portion 8 from the opening 22 can be adjusted. Further, the provision of the temporary crimping portion 8 having the constricted portion 8d at the above position has an advantage that a mismatch can be provided in the process of manufacturing the temporary crimping portion 8 by punching, and burrs are hardly generated.

  In addition, although the case where one temporary crimping portion 8 is formed in the central portion of the temporary crimping portion 8 is illustrated here, the position of the temporary crimping portion 8a is not limited to the central portion, and the number of temporary crimping portions 8 However, the number of temporary crimps 8 a may be provided in the temporary crimping portion 8.

(Punching device)
FIG. 6 is a schematic diagram showing an example of a punching device that manufactures a workpiece WR constituting the laminate 20 by punching. The punching device 100 shown in the figure includes an uncoiler 110 to which the winding body C is mounted, a feeding device 130 for an electromagnetic steel sheet (hereinafter referred to as “working plate W”) drawn from the winding body C, and the processing plate W. Are provided with a progressive die 140 for punching and a press machine 120 for operating the progressive die 140.

  The uncoiler 110 holds the winding body C in a rotatable manner. The length of the electrical steel sheet constituting the wound body C is, for example, 500 to 10,000 m. The thickness of the electrical steel sheet constituting the wound body C may be about 0.1 to 0.5 mm. From the viewpoint of achieving more excellent magnetic properties of the laminated core R, the thickness is about 0.1 to 0.3 mm. There may be. The width | variety of an electromagnetic steel plate (workpiece board W) should just be about 50-500 mm.

  The feeding device 130 includes a pair of rollers 130a and 130b that sandwich the work plate W from above and below. The workpiece plate W is introduced into the progressive die 140 via the feeder 130. The progressive die 140 is for continuously performing a punching process, a half punching process, and the like on the work plate W. The progressive die 140 has a function of manufacturing the stacked body 20 by sequentially stacking the processed bodies WR obtained by punching, and a function of discharging the manufactured stacked body 20.

(Manufacturing method of laminated iron core for rotor)
Next, a method for manufacturing the laminated iron core R will be described. The manufacturing method of the laminated iron core R includes a process for producing the laminated body 20 integrated by the temporary caulking 8a (steps (A) and (B) below) and a process for producing the laminated iron core R from the laminated body 20 (below ( C) step and (D) step). More specifically, the method for manufacturing the laminated iron core R includes the following steps.
(A) A step of punching the workpiece WR having the temporary crimping portion 8 from the work plate W in the progressive die 140.
(B) A step of stacking a plurality of workpieces WR and integrating them by temporary caulking 8a.
(C) A step of fastening the laminate 20 by filling the magnet insertion hole 15 with the resin material 16.
(D) The process of removing the temporary crimping part 8 from the laminated body 20.

  (A) A process is a process of forming temporary crimping part 8 which has temporary crimping 8a. The process (A) includes a step of forming a temporary crimp 8a at a predetermined position of the processed plate W and a step of punching out the three through holes 22a, 22b, and 22c from the processed plate W. Either of these steps may be performed first. Fig.7 (a) is a top view which shows the state of the to-be-processed board W after implementing these steps. In FIG. 7A, a substantially equilateral triangle connected by three broken lines indicates the outline of the opening 22. In other drawings, a broken line is used to show the outline of the opening.

  The step (A) further includes a step of forming the three top portions 8b by half-punching or punch-back after punching the workpiece W in the state shown in FIG. By performing this step, the temporary crimping portion 8 can be formed in the opening 22. A dashed line shown in FIG. 7B is an example of the shape of the punch used in this step, and shows a portion other than the portion forming the top portion 8b. By using such a punch, it is possible to form the above-mentioned constricted portion 8d and sufficiently suppress the generation of burrs in the process of forming the temporary crimping portion 8. In other drawings, the shape of the punch for forming the top portion (fitting portion) of the temporary crimping portion is shown by using the alternate long and short dash line.

  In the step (B), a plurality of workpieces WR having temporary crimps 8a are stacked and integrated with the temporary crimps 8a. In addition, from the viewpoint of reducing the influence of the thickness deviation of the processed body WR, the transposition may be performed in the step (B).

  Regarding the steps (C) and (D), the temporary crimping portion 8 may be removed before fastening with the resin material 16 as long as the laminated body 20 does not fall apart even if the temporary crimping portion 8 is removed. For example, if the laminate 20 is fixed to a resin filling device, the temporary crimping portion 8 may be removed before the resin material 16 is filled, and then the resin material 16 may be filled into the magnet insertion hole 15. Further, the temporary crimping portion 8 may be removed simultaneously with the filling of the resin material 16.

  According to the method for manufacturing a laminated core according to this embodiment, the laminated core R having no caulking can be finally obtained by removing the temporary caulking portion 8 from the laminated body 20. Moreover, according to the said manufacturing method, the temporary crimping part 8 can be removed easily enough in the said (d) process.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment. For example, in the above embodiment, the case where the tip of the top 8b is formed at a position that coincides with the contour line of the opening 22 as shown in FIG. 7C is illustrated. However, as shown in FIG. The tip of 8b may be formed inside the contour line of the opening 22. By adopting such a configuration, it is possible to further suppress the stress and strain resulting from the formation and removal of the temporary crimping portion 8 from affecting the product. If the place where the temporary crimping portion 8 is formed does not have a significant adverse effect on the performance / quality of the product, as shown in FIG. 9, the tip of the top portion 8b is outside the contour line of the opening 22 (product Side).

  In the above embodiment, the case where only the temporary caulking 8a is formed on the main body portion of the temporary caulking portion 8 is illustrated, but the fitting strength adjusting portion for adjusting the fitting strength with respect to the opening portion 22 is used as the temporary caulking. You may form in the part 8. FIG. For example, as shown in FIG. 10A, the provisional crimping portion 8 can be provided with an opening 8e to reduce the fitting strength of the temporary crimping portion 8. On the contrary, as shown in FIG. 10 (b), the fitting strength of the temporary crimping portion 8 can be increased by hitting or applying the coining 8f to the temporary crimping portion 8.

  The above-described opening 8e may be used when the temporary crimping portion 8 is removed. For example, a rod-shaped tool may be inserted into the opening 8e, and a force may be applied to the temporary crimping portion 8 in a predetermined direction via the tool. The configuration for facilitating the removal of the temporary crimping portion 8 is not limited to the opening, and a recess 8g may be appropriately provided on the side surface of the main body portion of the temporary crimping portion 8 as shown in FIG.

  In the above embodiment, the case where the rounded top portion 8 b is formed is illustrated, but the top portion 8 b may form a circular arc centered on the center of the opening 22. By adopting such a configuration, the temporary crimping portion 8 can be separated by applying a force in a direction perpendicular to the stacking direction of the stacked body 20 and rotating the temporary crimping portion 8 (temporary crimping block 8A). (See FIG. 12). In order to realize this, the top 8b of the temporary crimping portion 8 may be formed so as to form a circular arc centered on the center C of the opening 22 as shown in FIG. The circle of the two-dot chain line shown in the drawing means a circle centered on the center C of the opening 22.

  In the above-described embodiment, the case of forming the temporary crimping portion 8 having a substantially equilateral triangle in the upside down direction with respect to the opening portion 22 of the substantially equilateral triangle is illustrated, but the shapes of the opening portion 22 and the temporary crimping portion 8 are substantially triangular. In addition, the shapes of the two may be different from each other (not necessarily similar). The shape of the opening may be a substantially circular shape, a substantially oval shape, or a substantially polygonal shape having a plurality of corners. Moreover, as long as the temporary crimping portion has at least three apexes and at least two apexes of the apexes constitute a fitting portion for the opening, the temporary caulking portion may be an approximate triangle other than an approximately equilateral triangle, The part may be a rounded quadrangle, a polygon such as a pentagon, or a star.

  The opening 32 shown in FIG. 13 is a substantially regular pentagon, and a temporary caulking portion 28 having a substantially isosceles triangle is formed in the opening 32. In this case, in the above-described step (A), the step of forming the temporary crimp 8a at a predetermined position of the processed plate W and the step of punching the three through holes 32a, 32b, 32c from the processed plate W are performed. That's fine. Either of these steps may be performed first. FIG. 13A is a plan view showing a state of the work plate W after performing these steps. In FIG. 13A, a substantially pentagon connected by three broken lines indicates the outline of the opening 32. Then, what is necessary is just to implement the step which forms the three top parts 28b by the pushback after half punching or punching with respect to the to-be-processed board W of the state shown to Fig.13 (a). By performing this step, the temporary crimping portion 28 can be formed in the opening 32. An alternate long and short dash line shown in FIG. 13B is an example of the shape of the punch used in this step, and shows a portion other than the portion forming the top portion 28b.

  In the said embodiment, although the case where all the top parts 8b of the temporary crimping part 8 comprised the fitting part with respect to the opening part 22 was illustrated, a temporary crimping part has at least 3 top parts and at least 2 among the said top parts. It is only necessary that the tops form a fitting portion for the opening. In the temporary crimping portion 38 shown in FIG. 14, only two top portions 38 b and 38 b of the three top portions 38 b, 38 b and 38 c constitute a fitting portion for the opening 42. FIG. 14A shows a state in which through holes 42a and 42b are formed above and below the portion that becomes the temporary crimping portion 38. Thereafter, by performing half-punching or push-back after punching on the workpiece W in the state shown in FIG. 14A, two fitting portions (top portions 38b and 38b) are formed with respect to the opening 42. The temporary crimping portion 38 is formed.

  In the above embodiment, the case where the temporary crimping portion 8 is formed in the opening 22 that becomes the lightweight hole 18 in the laminated core R is illustrated, but the temporary crimping portion 8 is a place that does not have a great adverse effect on the performance / quality of the product. Any place may be used. For example, in the case of a laminated body for manufacturing a laminated iron core for a stator, the temporary crimping portions 8 may be formed in a plurality of bolt holes for fixing the laminated body with bolts. In addition, as long as the fastening state of a laminated body can fully be maintained, it is not necessary to provide the temporary crimping part 8 in all the some bolt holes. For example, when the laminated iron core has six bolt holes, the temporary crimping portion 8 may be provided in three bolt holes, for example. Since the bolt hole may be provided at a position protruding from the peripheral edge of the laminated iron core, it may be referred to as a bolt ear hole. The diameter of the bolt hole is, for example, 7.0 to 10.5 mm, and may be 6.5 to 11.0 mm. In addition, as long as a laminated iron core can fully be fastened with a volt | bolt, the volt | bolt hole may be exhibiting the substantially circular shape and the substantially polygon deviated from the perfect circle.

  In the present embodiment, the case where the magnet material insertion hole 15 of the laminate 20 is finally fastened by being filled with the resin material 16 is illustrated, but a hole for filling the resin in addition to the magnet insertion hole 15 is separately provided. The fastening of the laminate 20 may be reinforced by providing the resin material 16 therein. Moreover, you may use together the resin material 16 and other fastening means (welding, adhesion | attachment, etc.). When annealing is performed to eliminate the distortion of the workpiece WR, the annealing may be performed at an appropriate timing. For example, when the laminate 20 is integrated with the resin material 16, annealing may be performed prior to filling the resin material 16, and when welding is used in combination, annealing may be performed after welding.

  Although the said embodiment illustrated the case where the process body WR was punched from the one to-be-processed board W, you may make it pile up the several process board W and punch the process body WR. In this case, when using the some to-be-processed board W together, you may use combining a thing from which a kind, thickness, and / or width differ. Further, both the processed body WR and the stator processed body may be punched from one processed plate W.

8, 28, 38 ... Temporary crimping portion, 8a ... Temporary crimping, 8A ... Temporary crimping block, 8b, 28b, 38b ... Top (fitting portion), 8c ... Side, 8d ... Constriction portion, 8e ... Opening (fitting strength) Adjusting part), 8f ... tapping or coining (fitting strength adjusting part), 8g ... dent, 8h ... through hole, 10 ... laminated body, 12 ... shaft hole, 15 ... magnet insertion hole, 16 ... resin material, 18 ... light weight Hole, 20 ... laminate, 22, 32, 42 ... opening, 22a, 22b, 22c, 32a, 32b, 32c, 42a, 42b ... through hole, 38c ... top, MR ... electromagnetic steel sheet, R ... laminated iron core, W ... Work plate, WR ... Processed body.

Claims (8)

A laminated body for a laminated core in which a plurality of workpieces having temporary crimps are laminated and fastened together by the temporary crimps,
The processed body having the temporary caulking,
An opening,
A temporary caulking portion provided in the opening and having the temporary caulking;
With
The temporary crimping portion has at least three top portions, and at least two top portions of the top portions constitute a fitting portion for the opening.   The laminate according to claim 1, wherein the opening has a substantially polygonal shape having a plurality of corners.   The laminated body according to claim 1, wherein the temporary crimping portion has a constricted portion on a side surface in the vicinity of the top portion constituting the fitting portion.   The laminate according to any one of claims 1 to 3, wherein a tip of the top is formed at a position that coincides with a contour line of the opening.   The laminated body according to any one of claims 1 to 3, wherein a tip of the top portion is formed inside or outside a contour line of the opening.   The laminated body according to any one of claims 1 to 5, wherein the temporary crimping portion includes a fitting strength adjusting portion for adjusting a fitting strength with respect to the opening. It is a manufacturing method of the layered product according to any one of claims 1 to 6,
(A) a step of punching the processed body having the temporary caulking from a work plate;
(B) stacking a plurality of the workpieces and integrating them by temporary crimping;
The manufacturing method of a laminated body provided with these. (C) a step of fastening the laminate produced by the production method according to claim 7 using a resin material, welding, adhesion or a combination thereof;
(D) removing the temporary crimping portion from the laminate;
A method for manufacturing a laminated iron core.

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