Method and device for manufacturing core member, and method for manufacturing divided laminated core member

Abstract

In the present invention, in the manufacture of core components of a split laminated core for a rotating electric machine, the process includes: a first punching step, in which a punching mechanism of a conveying device having a strip-shaped electromagnetic steel plate is used to punch out a first core component directly from the electromagnetic steel plate according to a product shape; a conveying step, in which the electromagnetic steel plate is conveyed by the conveying device; and a second punching step, in which the punching mark shape of the first core component is used and a product shape guide pin having the outer shape of the core component is used for positioning, and the second core component is punched out directly according to the product shape by the punching mechanism. Through the above-mentioned steps, a plurality of core components can be punched out from the strip-shaped electromagnetic steel plate with high precision, and high-speed punching based on the punching mechanism can be performed without reducing the material yield.

Description

Technical Field

[0001] The present application relates to a method and an apparatus for manufacturing a core member of a split laminated core for use in a rotating electrical machine, and a method for manufacturing a split laminated core. Background Art

[0002] In the existing method for punching out the core parts of the split laminated core for rotating electric machines, the split iron cores, i.e., the core parts, which are the products, are arranged differently on the electromagnetic steel plates, and guide pins and the like are arranged on the steel plates that are not used for punching out the product shapes. As a result, the positioning accuracy of the steel plates in the downstream conveying direction is improved, and the product punching dimensions are ensured and the material is effectively utilized. In addition, the steel plates are positioned during punching by the guide pins. As such a method for punching out the core parts of the split laminated core for rotating electric machines, there is, for example, Patent Document 1.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-226140 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] According to the manufacturing device of the rotating electric machine disclosed in Patent Document 1, the core component as the divided stator core is formed by punching from a strip-shaped electromagnetic steel plate using a die. The shape of the core component is composed of a back yoke portion located on the outer side of the rotating electric machine and a tooth portion protruding toward the inner diameter side. As for the layout during punching, the directions are changed in a chimera-like manner to be arranged to face each other. In addition, by arranging guide pins and the like on the steel plate that is not used as the product shape, the positioning accuracy of the steel plate in the downstream conveying direction is improved, and the size of the product punching and the material yield are improved.

[0008] Usually, electromagnetic steel sheets as materials are positioned by guide pins, conveyed a certain amount, and then punched. However, in positioning based only on guide pins, if the rigidity of the steel sheet is insufficient, the steel sheet will be twisted or deformed, resulting in problems such as failure to ensure the expected conveying amount and material tilting. In particular, since guide pins are only arranged at the ends of the steel sheet in a direction orthogonal to the material conveying direction, the following problem arises: positioning based only on guide pins cannot perform high-speed conveying and high-speed punching by punching.

[0009] Furthermore, if the guide pin is brought too close to the punched portion of the core member in order to improve the material yield, the core member die may be damaged. Therefore, it is difficult to ensure punching accuracy while ensuring the material yield.

[0010] Furthermore, since one product shape is punched out through multiple punching steps, there are multiple matching cutting portions for cutting the cut connection portion, and thus there is a problem that the deviation in the positioning dimension based on the guide pin has a significant impact, and the accuracy of the punching dimension deteriorates.

[0011] The present application is made to solve the above-mentioned problems, and its purpose is to enable a plurality of plate-shaped core components to be punched out with high precision from a rolled strip-shaped electromagnetic steel sheet, and to enable high-speed punching without reducing the material yield.

[0012] Technical means for solving technical problems

[0013] The manufacturing method involved in the present application is a manufacturing method for a core component of a split laminated core of a rotating electric machine, characterized in that it includes: a first punching step, in which a punching mechanism of a conveying device having a strip-shaped electromagnetic steel plate is used to punch out the first core component directly from the electromagnetic steel plate according to a product shape; a conveying step, in which the electromagnetic steel plate is conveyed by the conveying device; and a second punching step, in which the punching mark shape of the first core component is used and a product shape guide pin having the outer shape of the core component is used for positioning, and the second core component is punched out directly according to the product shape by the punching mechanism.

[0014] Effects of the Invention

[0015] In the manufacturing method of the core component of the present application, the product shape of the core component is directly punched, so the dimensional accuracy of the product can be improved. In addition, the punching mark of the product shape is used for the positioning of the core component punching, so high-speed punching can be performed without reducing the material yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a plan view showing a rotating electrical machine using the core member and the divided laminated core according to the first embodiment.

[0017] Figure 2 This is a plan view showing the core member according to the first embodiment.

[0018] Figure 3 This is a perspective view showing the divided stacked core according to the first embodiment.

[0019] Figure 4 This is a plan view of an electromagnetic steel sheet for explaining the method for manufacturing a core member according to the first embodiment.

[0020] Figure 5 This is a flowchart showing the method for manufacturing the core member according to the first embodiment.

[0021] Figure 6 This is a schematic diagram showing a core member manufacturing apparatus according to the first embodiment.

[0022] Figure 7 This is a side view showing the core member manufacturing apparatus according to the first embodiment.

[0023] Figure 8 This is a plan view showing the core member manufacturing apparatus according to the first embodiment.

[0024] Fig. 9A This is a plan view of an electromagnetic steel sheet for explaining the method for manufacturing a core member according to the first embodiment.

[0025] Fig. 9B This is an enlarged view showing the product shape guide pin involved in the first embodiment.

[0026] Fig.10 It is a plan view of an electromagnetic steel sheet for explaining the method for manufacturing a core member according to the second embodiment.

[0027] Fig.11 It is a plan view of an electromagnetic steel sheet for explaining a method for manufacturing a core member according to the third embodiment.

[0028] Fig.12 It is a plan view of an electromagnetic steel sheet for explaining a method for manufacturing a core member according to a fourth embodiment.

[0029] Fig.13 It is a plan view of an electromagnetic steel sheet for explaining a method for manufacturing a core member according to the fifth embodiment.

[0030] Fig.14 It is a schematic diagram showing the characteristics of the electromagnetic steel sheet according to the sixth embodiment.

[0031] Fig.15A This is a cross-sectional view showing a divided stacked core according to the sixth embodiment.

[0032] Fig. 15B This is a cross-sectional view showing a divided stacked core according to the sixth embodiment. DETAILED DESCRIPTION

[0033] Implementation method 1.

[0034] A method for manufacturing a core member of a divided laminated core for use in a rotating electrical machine and a manufacturing apparatus thereof will be described. Figure 1 This is a plan view showing a rotating electrical machine using the core member and the divided laminated core according to the first embodiment. Figure 1In the embodiment, the rotary electric machine 100 has a structure including a stator core 3 obtained by connecting divided laminated cores 2 in an annular shape inside a frame 1 , and a rotor 4 provided inside the stator core 3 . Figure 1 Although an example in which the magnet 5 is provided on the rotor 4 is shown in FIG. 1 , the rotor of the induction motor which does not include a magnet may be used.

[0035] The split laminated core 2 is a laminated core obtained by laminating core parts, the core parts are composed of a back yoke part on the outer diameter side and a tooth part protruding from the back yoke part to the inner diameter side and forming a magnetic pole, and are punched out from an electromagnetic steel sheet. The stator core 3 is formed by connecting the split laminated core 2 in an annular shape in the circumferential direction of the rotating electric machine 100, and is held on the inner periphery of the annular frame 1 by press-fitting or shrink fitting.

[0036] Figure 2 FIG. 2 shows a core member 20 punched out from a strip-shaped electromagnetic steel sheet. Figure 3 2 shows an example of a divided laminated core 2 in which core members 20 are stacked and the core members 20 are fixed to each other in the stacking direction by welding, bonding, or riveting to form a block. Figure 2 and Figure 3 , the shape of the tooth portion 22 protruding from the back yoke portion 21 in the inner diameter direction is shown. In the center of the outer diameter side of the back yoke portion 21, a dovetail groove portion 23 is provided for aligning the core component 20 during stacking. In addition, the back yoke portion 21 is provided with a core positioning protrusion 24a and a core positioning recess 24b, which are used for positioning when the split stacked core 2 is connected and combined into a circular ring shape. The tooth portion 22 is wound with a coil, and therefore, is formed thinner relative to the circumferential direction. As a result, the core component 20 has a fan shape in which the back yoke portion 21 is wider and the tooth portion 22 is narrower.

[0037] Next, a method for manufacturing the core member 20 will be described. Figure 4 The concept of the manufacturing method of the core component is shown in the top view of the electromagnetic steel sheet 6. Figure 5 The flow chart of the manufacturing process is shown in FIG. Figure 6 The core component manufacturing device 500 is a punching mechanism shown in the figure. The core component manufacturing device 500 is composed of a punching device 300 and a die device 400. In the punching device 300, the electromagnetic steel sheet 6 in a strip shape wound into a cylindrical shape is sent out from an unwinder (not shown) by a conveyor device 310, and the electromagnetic steel sheet 6 is punched out by the die device 400 to manufacture the core component 20.

[0038] Figure 4In the embodiment, the following example is shown: the punching process of the core member 20 is divided into 6 parts, and punching is performed at 2 places in each process, a total of 12 places. In the downstream conveying direction D of the electromagnetic steel sheet 6, there are steps S10 of the first punching process to step S60 of the sixth punching process, step S70 of the scrap cutting process, and steps S15 to S55 of electromagnetic steel sheet conveying for conveying the electromagnetic steel sheet 6 between the processes.

[0039] use Figure 5 The flow chart of the electromagnetic steel plate 6 is used to explain the movement of the electromagnetic steel plate 6. Figure 4 The process of the punching process in step S10. The electromagnetic steel sheet 6 conveyed by the conveying device 310 is punched as the first core component 20 at two locations indicated by the shadows of the punching marks 611 and 612 in the first punching process of step S10. Regarding the punching direction, the back yoke portion 21 is set to the upstream side of the conveying direction D, and the tooth portion 22 is set to the downstream side of the conveying side D. After punching, the electromagnetic steel sheet 6 is conveyed by a length P equivalent to 1 pitch. The length P of 1 pitch is a value obtained by summing the product size W in the conveying direction of the core component 20 as a product and the margin width X as the interval in the conveying direction of the punching mark. Next, in step S15, as idle conveyance, the electromagnetic steel sheet 6 is further conveyed by a length P equivalent to 1 pitch.

[0040] In step S20, as a second punching step, the punching mark shapes of the punching marks 611 and 612 previously punched in the first punching process are used, and the punching mark 611 is positioned using product shape guide pins 71a, 71b, and the punching mark 612 is positioned using product shape guide pins 72a, 72b. In the positioned state, the two places indicated by the shadows of the punching marks 621 and 622 are punched as the second core component 20. The punching direction is the same as in step S10, and the back yoke part 21 is set to the upstream side of the conveying direction D. After punching, the electromagnetic steel sheet 6 is conveyed by a length P equivalent to 1 pitch. In step S25, as an idle conveyance, the electromagnetic steel sheet 6 is further conveyed by a length P equivalent to 1 pitch.

[0041] In the subsequent process, steps S30, S35, S40, S45 and S55 repeat the same actions as steps S20 and S25, so detailed description is omitted. In step S30, the two places indicated by the shadows of the punching marks 631 and 632 are punched out as the third core component 20. However, as shown by the punching marks 631 and 632, the punching direction of the core component 20 is opposite to that of steps S10 and S20, and the back yoke part 21 is set to the downstream direction of the transmission direction D. In step S40, the two places indicated by the shadows of the punching marks 641 and 642 are punched out as the fourth core component 20. The punching direction is the same as that of step S30. In step S50, the two places indicated by the shadows of the punching marks 651 and 652 are punched out as the fifth core component 20. The punching direction is the same as that of step S10.

[0042] Next, in step S60, two places indicated by the shadows of the punching marks 661 and 662 are punched out as the sixth core member 20. The punching direction is the same as that in step S10. After punching, the electromagnetic steel sheet 6 is conveyed by a length P equivalent to one pitch. As described above, in the width direction of the electromagnetic steel sheet 6, in a state where the shapes of the punching marks after the punching of the core member 20 are arranged in directions different from each other, it becomes a state where only the margin width Y in the width direction remains and all are punched out. In the last step S70, in the scrap cutting process, scrap cutting is performed on these margin parts in the area indicated by the cutting part 8.

[0043] As described above, in a series of steps, the core member 20 is directly punched into the shape of every two products by the die in each of the first to sixth punching steps, so that every 12 products can be punched out by one punching by the punching mechanism. The above steps are performed simultaneously and in parallel inside the manufacturing device 500 as the punching mechanism, so that every time the electromagnetic steel sheet 6 is transferred by one pitch, every 12 core members 20 can be manufactured simultaneously.

[0044] The transmission pitch P of the electromagnetic steel sheet 6 is set to the product size W + margin width X, and multiple core components 20 are arranged in parallel or differently from each other, thereby achieving effective use of materials. In addition, in the punching of the core component 20, it is set to be a total punching that forms the product shape through one punching, and the shearing processing direction is consistent, and there is no need for matching cutting. Therefore, the punching size accuracy of the product can be improved. In addition, the mold structure can be simplified, which has the effect of improving the accuracy of the product size and reducing the mold cost, etc., which improves productivity. In addition, in each punching process, it can also be configured to punch more than two places, which can further improve productivity.

[0045] Next, use Figure 7 Next, the manufacturing apparatus 500 of the core member 20 will be described. Figure 7A side view of a core member manufacturing device 500 using a punching device 300 (including an unillustrated uncoiler) and a die device 400 is shown. The die device 400 is supported by the punching device 300 via a guide column 320. In addition, the die device 400 includes a first punching section 410 for performing step S10 of the first punching process, and a second punching section 420 for performing step S20 of the second punching process. In addition, each punching section is provided with a third punching section 430 for performing step S30 of the third punching process to a sixth punching section 460 for performing step S60 of the sixth punching process. In addition, a scrap cutting section 470 is provided for finally performing scrap cutting in step S70 of the scrap cutting process.

[0046] In the first punching section 410 to the sixth punching section 460 for punching the core component 20, a punch die 401a and a die 401b are respectively provided, and the core component 20 punched out in each process is discharged to the core component discharge section 330. In addition, in the second punching section 420 to the sixth punching section 460, product shape guide pins 402 for positioning during punching are arranged. The mold 401 for punching the core component 20 has a punch die 401a as an upper mold, and a die 401b as a lower mold, which are respectively arranged at two locations constituting the punching area of ​​each punching section. In addition, the mold device 400 has a stripping plate 404 for stripping the punched core component 20 from the mold 401. Here, the product shape guide pin 402, as actually Figure 4 The product shape guide pins used in the second blanking part 420 are divided into four and arranged corresponding to the blanking trace shapes of the back yoke part and the tooth part of the blanking traces 621 and 622 of the core member 20. In addition, four product shape guide pins are also arranged in the third blanking part 430 to the sixth blanking part 460. Afterwards, when they are handled as parts of the mold device 400, they are collectively referred to as product shape guide pins 402. When used for positioning on the electromagnetic steel sheet 6, they are represented by separate reference numerals as product shape guide pins 71a, 71b, 72a, and 72b.

[0047] Next, Figure 7The movement of the manufacturing device 500 involved is explained. First, the strip-shaped electromagnetic steel plate 6 is conveyed to the mold device 400 in a downstream manner by the conveying device 310. In the first punching section 410, step S10 of the first punching process of punching the first core component 20 using the first mold 401 (punch die 401a, die 401b) is performed. Thus, punching marks 611 and 612 are formed. In the second punching section 420, positioning is performed using the product shape guide pin 402 arranged on the punching mark previously punched out, and step S20 of the second punching process of punching the second core component 20 using the second mold 401 (punch die 401a, die 401b) is performed. In the third punching section 430 to the sixth punching section 460, the positioning of the product shape guide pin 402 and the punching by the die 401 are performed as the third punching process step S30 to the sixth punching process step S60 by the same operation as the second punching section 420. In addition, in the scrap cutting section 470, the scrap cutting process step S70 is performed to cut the scrap of the electromagnetic steel sheet 6 punched out up to the sixth punching process step S60.

[0048] In the present embodiment, the die 401 is arranged so that two locations are punched simultaneously in each of the first punching portion 410 to the sixth punching portion 460, and thus the core member 20 is simultaneously generated at 12 locations by one punching action of the punching device 300. In addition, in the present embodiment, a structure is adopted in which the number of punchings of each punching portion of the core member 20 is set to 2 and the number of punching portions is set to 6, but by using the punching marks of the core member 20 punched out in the previous process for positioning, it is possible to configure such that the same action can be performed even when the number of punchings and the number of punching portions are increased.

[0049] Furthermore, by using the product shape guide pin 402, the punching load can be equalized, the inclination of the die 401 is suppressed, and the gap between the punch die 401a and the die 401b becomes stable, thereby improving the punching accuracy. In addition, since no deviation equivalent to the positioning gap occurs during transfer, the accuracy of the product shape can be improved.

[0050] In addition, the punching shape to be punched and the structure of the die 401 are the same in each punching part, so the punching load is not easy to deviate. In particular, when using a thin plate material of less than 0.3 mm, the allowable size of the gap becomes narrower (6% of the plate thickness, 0.018 mm), so the equalization of the punching load as described above is effective. It has the effect of enabling stable punching based on the die and improving the accuracy of the product shape.

[0051] Figure 8, a top view of the manufacturing device 500 is shown. The core components 20 punched out by the first punching section 410 to the sixth punching section 460 of the die device 400 are stacked for each punching section and discharged to the core component discharge section 330. The discharged core components 20 are collected by a conveying device such as a belt conveyor.

[0052] exist Figure 4 and Fig. 9A The strip-shaped electromagnetic steel sheet 6 shown has a plurality of punching marks of the core member 20, and the area punched by the punch die 401a and the die 401b is arranged as follows: at least one of the punching marks 622 of the second core member 20 punched in the step S20 of the second punching process is set between the product shape guide pins 71a, 71b, 72a, 72b based on the punching mark 611 of the first core member 20 and the product shape guide pins 72a, 72b based on the punching mark 612. As a result, the margin width X of the electromagnetic steel sheet 6 during downstream conveyance can be stabilized, and the high-speed punching is stabilized.

[0053] exist Fig. 9A Detailed contents and structure of the product shape guide pin 402 for positioning the electromagnetic steel sheet 6 are described in the following. The punching mark obtained by punching the core member 20 is not a circular hole shape, and therefore, positioning cannot be performed only by a general guide pin. Therefore, in the present embodiment, in the punching area of ​​the product shape, the product shape guide pin 402 having the same shape as a part of the product shape is dividedly arranged in each back yoke part 21 and tooth part 22, and positioning is performed in the punching mark 611 using the product shape guide pins 71a and 71b. Fig. 9B , an enlarged view of the product shape guide pins 71a and 71b arranged on the punching mark 611 is shown. The punching mark 611 is obtained by punching the core member 20 into the product shape by the punch die 401a and the die 401b, and the cutout has the property of a shearing surface. The shearing surface directly maintains the outer shape and size of the punch die 401a, and can be used to perform positioning with high precision. Fig. 9B As shown, the product shape guide pin 71a is positioned using three surfaces of shearing processing 71aa, 71ab, and 71ac. In addition, the product shape guide pin 71b is positioned using three surfaces of shearing processing 71ba, 71bb, and 71bc.

[0054] The punching mark 612 is also positioned using the product shape guide pins 72a and 72b. Thus, four locations of the punching mark shape can be used. If three or more of the shearing surfaces of the punching mark are used, the electromagnetic steel sheet 6 can be positioned. Therefore, in this embodiment, positioning of a total of 12 shearing surfaces, i.e., 3 surfaces × 4 locations, can be performed, and positioning can be performed with higher accuracy.

[0055] In addition, by utilizing the dovetail groove portion 23 on the outer diameter side of the back yoke portion 21 as the shape of the product shape guide pins 71a, 72a on the back yoke portion 21 side, the positioning accuracy of the steel plate is improved. As a result, the margin width X can be reduced, and high-speed punching by stamping can be performed. In addition, the shape of the product shape guide pin 402 can be configured to match the product shape, so it can also be configured to the minimum required shape and size, and the degree of freedom in designing the product shape guide pin 402 is also improved. In addition, by utilizing the product punching area of ​​the core component 20 and utilizing the product shape, there is no need for the punching process of the guide pin hole such as the guide pin, and there is no need to transfer waste materials other than the margin. In addition, it has the following effects: the number of mold parts can be reduced and the mold size can be suppressed. As a result, the material yield can be improved by ensuring the product punching dimensional accuracy, high-speed punching based on stamping, and a significant reduction in the width of the coil material.

[0056] As described above, the manufacturing method of the core component involved in embodiment 1 performs the following steps: a first punching process step S10 in which a first core component 20 is punched directly from the electromagnetic steel plate 6 according to the product shape using a stamping mechanism of a conveying device 310 having a strip-shaped electromagnetic steel plate 6, namely a manufacturing device 500; a conveying process in which the electromagnetic steel plate 6 is conveyed using the conveying device 310; and a second punching process step S20 in which a product shape guide pin 402 matching the outer shape of the core component 20 is used, and the punching mark shape of the first core component 20 is used for positioning, and the second core component 20 is punched directly according to the product shape using a stamping mechanism, namely the manufacturing device 500.

[0057] According to such a manufacturing method of the core member 20, the core member 20 can be punched directly according to the product shape, thereby improving the dimensional accuracy of the product. In addition, the punching mark of the product shape is used for the positioning of the punching of the core member 20, so that there is no need for extra waste materials and molds other than the product, and high-speed punching can be performed without reducing the material yield.

[0058] Implementation method 2.

[0059] Embodiment 2 is a partial modification of Embodiment 1, and its changes will be described. Fig.10A top view of the electromagnetic steel sheet 6 according to the second embodiment is shown. In the first embodiment, positioning in the conveying direction is performed only by the product shape guide pins 71a, 71b, 72a, and 72b, but in the present embodiment, a structure obtained by combining the guide pin 71c is described. In the core body component divided in the circumferential direction, there are many cases where the concave and convex parts used when the core body positioning convex part 24a and the core body positioning concave part 24b are provided when the core body component is arranged in a circular ring in the circumferential direction and the radial direction. Therefore, as a means to ensure the positioning accuracy and simplify the mold device, the guide pin 71c is arranged in the core body positioning concave part 24b of the punching area of ​​the core body component, and the second core body component 20 is punched by combining the product shape guide pins 72a and 72b with the guide pin 71c, which can be used for positioning the electromagnetic steel sheet 6.

[0060] As a result, the number of configuration methods of the mold device 400 can be increased, and the degree of freedom of the mold layout can be increased. In addition, as the electromagnetic steel sheet 6 becomes only the margin width X in the subsequent punching process, the rigidity decreases. Therefore, by combining the guide pin 71c with the product shape guide pins 72a and 72b, the positioning accuracy of the electromagnetic steel sheet 6 can be ensured and the mold device 400 can be simplified. In addition, by simplifying the mold structure, high-speed punching can be performed.

[0061] In this case, the punching mark 622 of the second core member 20 punched out in step S20 of the second punching process is set within the range SPb, which is sandwiched by the product shape guide pins 72a and 72b based on the punching mark 612 of the first core member 20 and the guide pin 71c of the core positioning recess 24b based on the punching mark 611, which is effective for stabilizing the punching. In addition, the guide pin 71c has a positional interval SPc in the conveying direction D between the product shape guide pin 72a and the product shape guide pin 72b in the conveying direction D, and a positional interval SPd in ​​the conveying direction D between the guide pin 71c and the product shape guide pin 72b, and stable positioning can be performed at three locations.

[0062] Implementation method 3.

[0063] Embodiment 3 is another partial modification of Embodiment 1, and its changes will be described. Fig.11 The top view of the electromagnetic steel sheet 6 according to the third embodiment is shown. In this embodiment, at the same time as the initial punching process, i.e., step S10 of the first punching process, guide holes 613 and 614 for guide pins are punched at two locations at both ends in a direction orthogonal to the steel sheet conveying direction D. The two ends of the steel sheet are set as ineffective areas that are not used as products, so guide holes can be arranged without reducing the material yield. In addition, Fig.11In the embodiment, the guide pins other than the two ends are constituted by the same product shape guide pins 402 as in the first embodiment. In addition, the center axes of the guide pins 71d and 72d at the two ends are arranged at positions offset by the position intervals SPe and SPf in the conveying direction D from the center axes of the product shape guide pins 71a and 72a and the center positions of the product shape guide pins 71b and 72b, respectively. As a result, in addition to the positioning of the product shape guide pins 71a, 71b, 72a, and 72b in the first embodiment, the positioning of the guide pins 71d and 72d at the two ends based on the present embodiment can also be utilized. Therefore, the positioning accuracy is further improved, and the margin width X can be stabilized. As a result, the punching accuracy can be improved, and punching based on high-speed punching can be performed.

[0064] Implementation method 4.

[0065] Embodiment 4 is a combination of Embodiment 2 and Embodiment 3. Fig.12 The top view of the electromagnetic steel sheet 6 according to the fourth embodiment is shown. In the present embodiment, guide pins 71c, 71d and 72d are used. The guide pin 71c utilizes the core positioning recess 24b, which is the radial positioning portion of the product shape, and the guide pins 71d and 72d are provided at both ends of the electromagnetic steel sheet 6. At this time, the central axes of the guide pins 71d and 72d at both ends of the electromagnetic steel sheet 6 are arranged at positions that are offset by a position interval SPg in the conveying direction D from the guide pin 71c utilizing the core positioning recess 24b. As a result, in addition to the positioning by combining the product shape guide pins 72a and 72b with the guide pin 71c according to the second embodiment, the positioning by the guide pins 71d and 72d at both ends according to the third embodiment can also be utilized. Therefore, even when the material width of the strip-shaped electromagnetic steel sheet is increased, the positioning accuracy of the coil material can be further improved and the margin width can be stabilized. As a result, the displacement and vibration during punching can be suppressed, and a high-precision punching size can be achieved. In addition, ultra-high speed punching can be achieved, improving productivity.

[0066] Implementation method 5.

[0067] Embodiment 5 is another partial modification of Embodiment 1, and its changes will be described. Fig.13 A plan view of the electromagnetic steel sheet 6 according to the present embodiment is shown. Fig.13 The punching direction of the core member 20 on the electromagnetic steel sheet 6 is different from that in the first embodiment. That is, the directions of the punching marks 611a, 612a, 621a, 622a of the core member 20 are arranged so that the back yoke portion 21 or the tooth portion 22 is opposite to each other in a direction orthogonal to the conveying direction D of the electromagnetic steel sheet 6. In addition, the product shape guide pins 73a, 73b, 74a, 74b are also arranged at positions that match the shapes of the punching marks. Fig.13In the conveying direction of the electromagnetic steel sheet 6, the punching marks of the core parts are arranged in four rows in different shapes. The punching process is changed to four steps S10a, S20a, S30a, and S40a. According to the shape of the core parts 20, the conveying pitch Pa of the electromagnetic steel sheet 6 can be shortened. Figure 4 9 , it can be seen that even if the margin width Xa is set equal to the margin width X, the pitch Pa can be made much smaller than the pitch P. Furthermore, the same manufacturing method can be used even when the width of the electromagnetic steel sheet 6 is increased and more than four rows of core members 20 are arranged.

[0068] In this embodiment, the pitch Pa in the downstream conveying direction becomes smaller, so the total length of the die can be reduced, and high-speed stamping and blanking can be further achieved. In addition, by miniaturizing the die device 400, it is also possible to reduce the size of the stamping device 300 and the manufacturing device 500. In addition, if a structure is adopted in which only the product shape guide pins 73a, 73b, 74a, and 74b are used, the guide pins are not required as in the first embodiment, and the material yield rate can be improved.

[0069] Implementation method 6.

[0070] Embodiment 6 shows a method for producing a divided laminated core body obtained by laminating the core body members 20 . Fig.14 Schematic diagram for explaining the thickness deviation as a characteristic of the electromagnetic steel sheet 6. Fig.14 As shown, the cross section CC in the width direction perpendicular to the conveying direction D of the electromagnetic steel sheet 6 has a semi-cylindrical shape with a slightly thicker center portion. Although the figure shows an exaggerated shape, the difference is actually within several tens of microns. Fig.14 In the example shown, the core members 20 are punched out in 6 rows perpendicular to the conveying direction D of the electromagnetic steel sheet 6. Therefore, the thickness of the core members 20 differs in each row. For example, the core members punched out from the ends of the electromagnetic steel sheet 6 are 20a, and the core members punched out in the center row are 20b.

[0071] like Fig.15A As shown, the thickness deviation of the divided laminated core 2 obtained by collecting only the same core component 20a is magnified by the number of laminated blocks of the core component 20a. Therefore, the overall size of the divided laminated core 2 is different from that of the divided laminated core obtained by laminating only other parts, such as the core component 20b. In addition, the problem of the divided laminated core being tilted during the lamination stage occurs.

[0072] In order to solve the above problems, in the divided laminated core 2 shown in this embodiment, the locations of the punched core members 20 are managed by punching rows, and a plurality of rows are combined and stacked in the stage of stacking the core members 20, thereby reducing errors. Fig. 15B This example is shown. Fig. 15B In the embodiment, by combining the thin core member 20a and the thick core member 20b, the influence of the thickness deviation after lamination can be reduced.

[0073] In addition, if you pay attention to Figure 4 As shown in the blanking positions, the blanking marks of the core member 20 in each process are combined at two locations in each of the first to sixth blanking processes to reduce the thickness deviation of the electromagnetic steel sheet 6. Therefore, by managing and combining the core member discharge portions 330 blanked in each process according to the blanking process, the influence of the thickness deviation can be reduced and the dimensional error can be reduced.

[0074] As described above, the core parts 20 punched out from the electromagnetic steel sheets 6 in the plurality of rows arranged in the conveying direction D are managed for each row, and two or more core parts 20 in different rows are stacked using a combination that reduces the dimensional error caused by the thickness deviation in the width direction of the electromagnetic steel sheets 6. As a result, the split laminated core 2 can reduce the influence of the thickness deviation after stacking and can reduce the dimensional error. In addition, the dimensional accuracy of the stator core 3 when the split laminated core 2 is assembled in a circular ring shape can be ensured, so that productivity is improved.

[0075] In the first to fifth embodiments, the manufacturing method is shown in which only the step of punching the core member 20 is performed. However, the caulking forming portion for fixing between the stacked layers may be arranged before or after the punching step.

[0076] In addition, in each of the above-described embodiments, an example of a core component 20 used for a stator core 3 is described. However, for example, in a rotating electric machine 100 in which a coil is wound on the rotor 4 side, the split laminated core having a back yoke portion and a tooth portion constituting the rotor 4, and its manufacturing method and manufacturing device can also be applied.

[0077] This application describes various illustrative embodiments and examples, but the various features, forms and functions described in one or more embodiments are not limited to the application of specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, it can be considered that countless unillustrated variations are also included in the technical scope disclosed in the specification of this application. For example, it is assumed that at least one constituent element is deformed, added or omitted, and at least one constituent element is extracted and combined with constituent elements of other embodiments.

[0078] Description of symbols

[0079] 1 Framework

[0080] 2 Split laminated core

[0081] 20, 20a, 20b core parts

[0082] 21 Back yoke

[0083] 22 teeth

[0084] 23 Dovetail groove

[0085] 3. Stator core

[0086] 4 Rotor

[0087] 5 Magnets

[0088] 6 Electromagnetic steel plate

[0089] 611, 611a, 612, 612a, 621, 621a, 622, 622a, 631, 632, 641, 642, 651, 652, 661, 662 punching marks

[0090] 613, 614 guide holes

[0091] 71a, 71b, 72a, 72b, 73a, 73b, 74a, 74b Product shape guide pin

[0092] 71c, 71d, 72d Guide pins

[0093] 71aa, 71ab, 71ac, 71ba, 71bb, 71bc Shearing surface

[0094] 8 Cutting section

[0095] 100 Rotating motor

[0096] 300 Punching device

[0097] 310 Transmission Device

[0098] 320 Guide column

[0099] 330 Core component discharge unit

[0100] 400 Moulding device

[0101] 401 Mould

[0102] 401a Die

[0103] 401b Die

[0104] 402 Product shape guide pin

[0105] 404 Stripping Plate

[0106] 410 First Punching Department

[0107] 420 Second Punching Department

[0108] 430 The third punching department

[0109] 440 Fourth Punching Department

[0110] 450 Fifth Punching Department

[0111] 460 Sixth Punching Department

[0112] 470 Waste Cutting Department

[0113] 500 Manufacturing device (stamping mechanism).

Claims

1. A method for manufacturing a core component, A method for manufacturing a core component of a divided laminated core for a rotating electrical machine, characterized in that: include: a first punching step, in which a first core member is punched directly from the electromagnetic steel sheet in a product shape by using a punching mechanism having a conveying device of a belt-shaped electromagnetic steel sheet; a conveying step of conveying the electromagnetic steel sheet by using the conveying device; as well as a second punching step, in which the punching mark shape of the first core member is used, and a product shape guide pin having the outer shape of the core member is used for positioning, and the second core member is punched directly according to the product shape by the punching mechanism, The product shape guide pin used in the second punching step is positioned using three or more surfaces of the punching mark shape of the first core member.

2. The method for manufacturing a core component according to claim 1, characterized in that: A plurality of the first core member and the second core member are punched out in one punching step.

3. The method for manufacturing a core component according to claim 2, characterized in that: At least one of the second core members punched out in the second punching step is provided at a position sandwiched by two or more of the product shape guide pins based on the punching trace shape of the first core member.

4. The method for manufacturing a core component according to any one of claims 1 to 3, characterized in that: After the second punching step, the conveying step of conveying the electromagnetic steel sheet downstream and the punching step of punching new core parts in sequence by using the punching mark shape of the core part punched out in the previous punching step for positioning the guide pin based on the product shape are repeated multiple times.

5. The method for manufacturing a core component according to any one of claims 1 to 4, characterized in that: The core member is fan-shaped and is composed of a back yoke portion contacting the outer diameter side of the rotating electric machine and a tooth portion protruding from the back yoke portion toward the inner diameter side of the rotating electric machine. The product shape guide pins used in the second punching step are divided and arranged corresponding to the punching mark shapes of the back yoke portion and the teeth portion of the punching mark of the first core member.

6. The method for manufacturing a core component according to claim 5, characterized in that: After the second punching process, the conveying process of conveying the electromagnetic steel sheet downstream is repeated multiple times, and the punching process of punching new core parts in sequence is performed by using the punching mark shape of the core part punched out in the previous punching process as the product shape guide pin, and the punched shape of the core part is arranged in different directions in the back yoke part and the tooth part.

7. The method for manufacturing a core component according to any one of claims 1 to 6, characterized in that: In the first punching step, the first core member is punched, and guide holes for guide pins are punched at both ends in the width direction of the electromagnetic steel sheet.

8. The method for manufacturing a core component according to claim 7, characterized in that: The guide hole is arranged at a position offset from the center position of the punching mark shape of the first core component used for positioning the product shape guide pin in the second punching process in the conveying direction of the electromagnetic steel sheet, and is used for positioning based on the guide pin in the second punching process.

9. A manufacturing device for a core component, A manufacturing device for a core component of a divided laminated core for a rotating electrical machine, characterized in that: include: A punching device having a conveying device for a strip-shaped electromagnetic steel sheet; as well as a die device having a plurality of blanking portions starting from a first blanking portion and a second blanking portion in a conveying direction of the electromagnetic steel sheet, The first punching section is provided with a first die for punching out a first core member from the electromagnetic steel sheet. The second punching part is provided with a product shape guide pin for positioning that matches the outer shape of the core component, and a second die for punching the second core component. The product shape guide pin used in the second punching portion is arranged at a position in contact with three or more surfaces of the punching mark shape of the first core member.

10. The core component manufacturing device according to claim 9, characterized in that: A plurality of dies used in the punching parts are arranged in each of the punching parts.

11. The manufacturing device of the core component according to claim 10, characterized in that: At least one of the dies for punching out the second core member in the second punching portion is disposed at a position sandwiched by two or more of the product shape guiding pins.

12. The manufacturing device of the core component according to any one of claims 9 to 11, characterized in that: In the punching section after the third punching section among the multiple punching sections arranged in the mold device, the product shape guide pin corresponding to the punching mark shape of the core component punched out in the previous punching section and the mold of the core component in the punching section are arranged.

13. The manufacturing device of the core component according to any one of claims 9 to 12, characterized in that: The core member is fan-shaped and is composed of a back yoke portion contacting the outer diameter side of the rotating electric machine and a tooth portion protruding from the back yoke portion toward the inner diameter side of the rotating electric machine. The product shape guide pins matching the outer shape of the core member are divided corresponding to the respective shapes of the back yoke portion and the tooth portion.

14. The manufacturing device of the core component according to claim 13, characterized in that: The die is arranged in a direction in which the shapes of the core member after punching are different from each other in the back yoke portion and the teeth portion.

15. The manufacturing device of the core component according to any one of claims 9 to 14, characterized in that: In the first punched portion, dies for punching guide holes are arranged at both ends in the width direction of the electromagnetic steel sheet, and guide pins corresponding to the guide holes are arranged in the second punched portion.

16. The manufacturing device of the core component according to claim 15, characterized in that: The guide hole is arranged at a position offset in a conveying direction of the electromagnetic steel sheet from a center position of a punching mark shape of the first core member used for positioning the product shape guide pin in the second punching portion.

17. A method for manufacturing a split laminated core, A method for manufacturing a split laminated core body used in a rotating electrical machine, characterized in that: A punching device having a conveying device for a strip-shaped electromagnetic steel sheet and a die device having a plurality of punching portions in a conveying direction of the electromagnetic steel sheet are used to manage core components punched out of the electromagnetic steel sheet in a plurality of rows arranged in the conveying direction by the rows. Two or more of the core members of the different rows are stacked by using a combination that reduces dimensional errors caused by thickness deviations of the electromagnetic steel sheets in the width direction, The core component is obtained by the method for manufacturing a core component according to any one of claims 1 to 8.

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