Laminated steel sheet manufacturing apparatus and laminated steel sheet manufacturing method

Abstract

To provide a laminated steel plate manufacturing device capable of accurately aligning a plurality of steel plates divided in a circumferential direction and laminated, and simplifying a structure for alignment.SOLUTION: A laminated steel plate manufacturing device manufactures a laminated steel plate used for a stator core of a motor, and includes a housing unit and a pressing unit. The housing unit houses a plurality of steel plates divided in a circumferential direction and laminated, in a state that divided laminated steel plates 11 as divided individual sections are aligned in the circumferential direction. The housing unit includes a reference member 20m including a magnet and arranged at a reference position on side surface of the divided laminated steel plates 11 in a direction perpendicular to a lamination direction, the reference positions being when each of the divided laminated steel plates 11 is aligned. The pressing unit presses the aligned divided laminated steel plates from the lamination direction of the divided laminated steel plates 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a laminated steel sheet manufacturing apparatus and a laminated steel sheet manufacturing method. [Background technology]

[0002] Patent Document 1 describes a stator for a rotating electric machine that includes a core having protrusions on one or both of the upper and lower end faces in the stacking direction, insulators installed on the end faces and having holes that fit into the protrusions, and slot cells that cover both circumferential side faces of the core and abut against the insulators on the end face sides. This stator makes it possible to align the core using the insulators and slot cells. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-092531 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if an attempt is made to use insulators and slot cells such as those described in Patent Document 1 to align multiple steel plates that are divided and stacked circumferentially with high precision, the structure required for alignment becomes complicated.

[0005] The present disclosure has been made in consideration of such problems, and aims to provide a laminated steel plate manufacturing apparatus and a laminated steel plate manufacturing method that are capable of accurately aligning multiple steel plates that have been divided and stacked circumferentially, and that can simplify the structure for alignment. [Means for solving the problem]

[0006] The laminated steel sheet manufacturing apparatus according to the present disclosure is an apparatus for manufacturing laminated steel sheets used in motor stator cores, and includes: a storage section that stores a plurality of steel sheets divided and stacked in the circumferential direction, with the divided laminated steel sheets being the individual divided parts, arranged in the circumferential direction; and a pressing section that presses the arranged divided laminated steel sheets from the stacking direction of the divided laminated steel sheets, wherein the storage section includes a reference member including a magnet that is disposed at a reference position for each divided laminated steel sheet when it is arranged, on a side of the divided laminated steel sheet in a direction perpendicular to the stacking direction. This makes it possible to align the plurality of steel sheets divided and stacked in the circumferential direction with high precision and simplifies the structure for alignment.

[0007] A laminated steel plate manufacturing method according to the present disclosure is a laminated steel plate manufacturing method for manufacturing laminated steel plates used in motor stator cores, and includes: a storage step of storing a plurality of steel plates divided and stacked in the circumferential direction, with the divided laminated steel plates being each divided into individual parts, arranged in the circumferential direction; and a pressing step of pressing the arranged divided laminated steel plates from the stacking direction of the divided laminated steel plates, wherein the storage step aligns the divided laminated steel plates using a reference member including a magnet, which is placed at a reference position for each divided laminated steel plate when arranging the divided laminated steel plates, on a side surface of the divided laminated steel plate in a direction perpendicular to the stacking direction. This makes it possible to align the plurality of steel plates divided and stacked in the circumferential direction with high precision and to simplify the structure for alignment. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a laminated steel plate manufacturing apparatus and a laminated steel plate manufacturing method that are capable of precisely aligning multiple steel plates that are divided and stacked in the circumferential direction and that can simplify the structure for alignment. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an example of a laminated steel sheet manufactured by a laminated steel sheet manufacturing apparatus according to an embodiment; [Figure 2] 3 is a schematic diagram for explaining a part of a process for manufacturing a laminated steel sheet by the laminated steel sheet manufacturing apparatus according to the embodiment. FIG. [Figure 3] 1A and 1B are a perspective view and a top view showing a first configuration example of an apparatus for manufacturing laminated steel sheets according to an embodiment; [Figure 4] 4 is a horizontal cross-sectional view showing a part of an example of magnet arrangement in the laminated steel sheet manufacturing apparatus of FIG. 3. FIG. [Figure 5] 3A and 3B are a perspective view and a partial top view showing a second configuration example of an apparatus for manufacturing laminated steel sheets according to an embodiment; [Figure 6] 10A and 10B are a perspective view and a partial side view showing a third configuration example of an apparatus for manufacturing laminated steel sheets according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Specific embodiments to which the present disclosure is applied will be described in detail below with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0011] <Embodiment> The main configuration of an apparatus for manufacturing a laminated steel sheet (hereinafter simply referred to as a manufacturing apparatus) according to an embodiment will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing an example of a laminated steel sheet manufactured by the manufacturing apparatus according to the present embodiment, and Figure 2 is a schematic view for explaining part of the process for manufacturing a laminated steel sheet by the manufacturing apparatus according to the present embodiment.

[0012] The laminated steel plate manufactured by the manufacturing apparatus according to this embodiment is a laminated steel plate used for a stator core of a motor, and can be, for example, a laminated steel plate 10 shown in Fig. 1. The laminated steel plate 10 is made up of a plurality of steel plates that are divided in the circumferential direction and stacked. In other words, the laminated steel plate 10 is a steel plate in which a plurality of steel plates are stacked and divided in the circumferential direction.

[0013] The laminated steel plate 10 is a steel plate in which divided laminated steel plates (hereinafter referred to as divided cores), which are individual divided parts, are arranged in the circumferential direction. Here, the laminated steel plate 10 is a steel plate used for the stator core of a motor, and is arranged so that the divided cores are not in contact with each other.

[0014] In Fig. 1, an example is given in which the split core obtained by splitting is six split cores 11 to 16, but the number of split cores may be two or more. The stacked state is as shown in Fig. 1, with an enlarged detailed view of one of the split cores 11.

[0015] The split core 11 can have recesses 11a and 11b at positions for contacting a reference member, which will be described later, on its outer peripheral surface 11c corresponding to the side surface on the outer peripheral side of the laminated steel plate 10. The number of recesses varies depending on the number of reference members to be contacted, and this number need only be sufficient to fix the positions of the arranged split cores 11. Instead of the outer peripheral surface 11c, recesses such as the recesses 11a and 11b can also be provided on one or more of the inner peripheral surface 11d corresponding to the side surface on the inner peripheral side of the laminated steel plate 10, the innermost peripheral surface 11e, which is the innermost inner peripheral surface, and the side surface 11f between the inner peripheral surface 11d and the innermost peripheral surface 11e.

[0016] The shapes and the like described for the split core 11 also apply to the other split cores 12 to 16. The split cores 12, 13, 14, 15, and 16 have recesses 12a and 12b, recesses 13a and 13b, recesses 14a and 14b, recesses 15a and 15b, and recesses 16a and 16b, respectively.

[0017] The manufacturing apparatus according to this embodiment includes a storage unit and a pressing unit, as described below. The storage unit stores a plurality of circumferentially divided and stacked steel plates in a state in which the split cores 11-16 are arranged in the circumferential direction. The storage unit can have an opening, i.e., a concave shape, but is not limited to this and can be configured with a convex protrusion. The storage unit also includes a reference member including a magnet, which is positioned at a reference position (contact position) on the side surface of each split core 11-16 in a direction perpendicular to the stacking direction, as a reference position for the split cores 11-16 when they are arranged. These magnets attract the split cores 11-16 and fix them in place. This reference position can also be referred to as a fixed position. The pressing unit presses the arranged split cores 11-16 in the stacking direction of the split cores 11-16. The reference position for each split core 11-16 may or may not include a small gap (gap) between adjacent split cores.

[0018] The following describes the accommodating portion and the pressing portion with specific examples. For simplicity, the following describes only the molding of the split core 11 by the manufacturing device, but the main operation is performed by the manufacturing device, and the split cores 12 to 16 are also molded at the same time.

[0019] As shown in Fig. 2, first, a plurality of steel plates are stacked and then divided to produce the split core 11p. The split core 11p can also be produced in an originally divided shape. In either case, the production method is not important. Next, adhesive AD is applied to the split core 11p and is impregnated between the steel plates that form the split core 11p (step S1).

[0020] In this state, the split core 11p is housed in the fixed dies 20a and 20b and pressed by the movable die 20c corresponding to the fixed die 20a (step S2). Here, the fixed dies 20a and 20b are members that constitute an example of the housing section, and the movable die 20c is a member that constitutes an example of the pressing section.

[0021] A reference member 20m is provided on the side of the fixed die 20b facing the split core 11p. Alternatively, the fixed die 20b itself may include the reference member 20m, in other words, a fixed die corresponding to the fixed die 20b may have the feature of the reference member 20m. The reference member 20m is a member including a magnet that is located at a reference position (contact position) on the side of the split core 11 in a direction perpendicular to the stacking direction, and serves as a reference position when arranging the split cores 11.

[0022] More specifically, in step S2, the fixed die 20b and the reference member 20m, primarily the magnetic force of the reference member 20m, attract the split core 11p from the side surface of the split core 11p perpendicular to the stacking direction, and fix it to a reference position. This reference position is the position where the split cores 11 are arranged. Then, in step S2, in this state, the fixed die 20a and the movable die 20c press the arranged split core 11p from the surface of the split core 11p in the stacking direction. Note that the opening described above is an opening for the movable die 20c.

[0023] In step S2, adhesive AD oozes out from the side surface of the split core 11p perpendicular to the stacking direction and on the side where the fixed die 20b is not arranged (step S3), so the remaining adhesive AD is removed (step S4). As a result, the split core 11p surrounded by the movable die 20c, the fixed die 20a, and the fixed die 20b becomes a split core 11 from which unnecessary adhesive AD has been removed.

[0024] Next, the movable die 20c, the fixed die 20a, the fixed die 20b, and the reference member 20m are removed (step S5) from the split core 11 to obtain the split core 11 (step S6). The split core 11 thus obtained has no or little burrs due to the adhesive AD that may need to be removed, at least on the contact surface with the movable die 20c.

[0025] The manufacturing apparatus of this embodiment is configured to use an open-type storage section to fix the split cores 11 to 16 at the molding reference position, and since such position fixing can be achieved by using magnetic force, there is no need to press the split cores 11 to 16 against the surface on which the adhesive AD remains.

[0026] Therefore, this embodiment provides the following first to fourth advantages. The first advantage is that distortion due to residual stress in the split cores and deterioration of magnetic properties can be suppressed. The second advantage is that there are no contact surfaces between the pressing portion of a movable die or the like and the split cores where adhesive remains, thereby improving demolding properties, suppressing deterioration in accuracy, and eliminating or suppressing the need for adhesive deburring. The third advantage is that the number of components of the accommodating portion and pressing portion that are subjected to a high-temperature environment for adhesive hardening can be reduced, thereby simplifying the structure for arranging the split cores, improving the shape accuracy of the stator core, and reducing the manufacturing cost of the stator core. The fourth advantage is that the overall size of the accommodating portion and pressing portion can be reduced, thereby improving the loading rate when loading the stator cores, for example, in an electric furnace. As can be seen from these advantages, this embodiment allows split cores made of laminated steel sheets to be formed into a highly accurate shape by impregnating them with adhesive.

[0027] As described above, in this embodiment, a reference member including a magnet is disposed at the reference position (fixed position) of the split core, so that the laminated steel plates can be attracted by magnetic force. Therefore, according to this embodiment, the reference position can be accurately set with high precision without requiring a complex structure, such as a mold, for arranging (aligning) the split cores. That is, according to this embodiment, it is possible to accurately align multiple steel plates that are circumferentially divided and stacked, and it is also possible to simplify the alignment structure. This embodiment is particularly beneficial for stator cores in which split cores are arranged, because high precision is required for the mating surfaces between the split cores and the shapes of the inner and outer peripheries of the split cores.

[0028] Next, a more specific example of the configuration of the manufacturing apparatus according to this embodiment will be described. The following will also be described using an example in which the manufacturing object is the laminated steel plate 10 shown in Fig. 1, but the invention can also be applied to other laminated steel plates. Each of the following configuration examples also has a structure in which, when fixing the split cores 11 to 16 to their respective reference positions, they are attracted to the reference positions using magnetic attraction instead of a force pressing them to the reference positions.

[0029] First, a first configuration example of this embodiment will be described with reference to Figures 3 and 4. Figure 3 is a perspective view and a top view showing the first configuration example of the manufacturing apparatus according to this embodiment. Figure 4 is a horizontal cross-sectional view showing a part of an example of magnet arrangement in the manufacturing apparatus of Figure 3.

[0030] The manufacturing apparatus 1 according to the first configuration example shown in FIG. 3 has reference members 21a and 21b at two locations as reference members for the split core 11, each of which is arranged so as to contact the recesses 11a and 11b shown in FIG. 1. Although not described here, similar reference members 22a and 22b, 23a and 23b, 24a and 24b, 25a and 25b, and 26a and 26b are also arranged for suction for the split cores 12, 13, 14, 15, and 16, respectively. It is sufficient to provide reference members at two or more locations per split core. However, if the gap described above is not provided, the reference member may be provided at one location per split core.

[0031] As shown in the upper part of FIG. 4, the reference member 21a can include a magnet 21am that attracts the split core 11 in the direction indicated by the white arrow in FIG. 3, and a non-magnetic or other magnetic body (hereinafter, magnet cover) 21ac that covers the magnet 21am and contacts the outer peripheral side of the split core 11. The other magnetic body refers to a magnetic body other than the magnet that is provided to attract the split core 11. Furthermore, the magnet cover 21ac being more non-magnetic than the other magnetic body makes it easier to form a magnetic path between the magnet cover 21ac and the split core 11, thereby increasing the attractive force to the split core 11. If the magnet cover 21ac is made of a magnetic body (magnetic material) such as steel, magnetic flux will flow through it, reducing the magnetic flux passing through the split core 11 and weakening the attractive force. For the same reason, the magnet cover 21ac is preferably made thin to prevent magnetic flux from escaping. In the top view at the bottom of FIG. 3, for convenience, the magnet 21 is represented by a black circle in the center of the reference member 11a, but magnet covers 21ac can also be provided on the top and bottom surfaces of the reference member 21a.

[0032] The reference member 21a is fixed to a base such as a mold provided on at least one of the upper and lower sides of the housing portion, and can serve as a reference mold for forming the shape of the split core 11. The reference member 21a can also be called a reference pin.

[0033] In this way, in the first configuration example, recessed portion 11a serving as a reference groove is arranged on the outer periphery of split core 11, and reference member 21a serving as a reference pin is arranged as a molding die. Split core 11 is then installed from the inner periphery so that reference member 21a and recessed portion 11a abut against each other, and the position of split core 11 is maintained by magnetic force from magnet 21am of reference member 21a. Note that reference member 21b has the same configuration as reference member 21a, and the position of split core 11 is maintained by both reference member 21b and reference member 21a.

[0034] Furthermore, since the contact between the reference member 21a and the recess 11a is intended to suppress movement of the split core 11, even if the contact area is not large, there is no problem because there is also contact between the reference member 21b and the recess 11b. In particular, reducing this contact area reduces the occurrence of burrs due to adhesive and reduces distortion of the split core 11 produced. The recess 11a is a groove formed on the outer periphery of the split core 11 and extending in the stacking direction. The cross section of this groove can be semicircular, forming an arc of less than 180 degrees, and the cross section of the reference member 21b perpendicular to the longitudinal direction can be a circle with a radius smaller than the radius of this arc. However, the shapes of the recess 11a and the reference member 21a are not limited to these and can be designed as appropriate to reduce the contact area.

[0035] Next, other examples of the shape of the magnet cover 21ac will be described. In Fig. 3, an example was given in which the reference member 21a is composed of the magnet 21am and the magnet cover 21ac and is arranged with no space between it and the split core 11, as shown in the upper part of Fig. 4. In contrast, as shown in the lower part of Fig. 4, the magnet cover 21ac can be configured to reduce the area covering the magnet 21am so that a space 21as is formed between the split core 11 and the magnet 21am, more specifically, so that the magnet cover 21ac is not present between the split core 11 and the magnet 21am, forming a space 21as. As a result, compared to the example in the upper part of Fig. 4, the example in the lower part of Fig. 4 can suppress a decrease in the magnetic flux passing through the split core 11 and a resulting decrease in the attractive force.

[0036] Next, a second configuration example of this embodiment will be described with reference to Fig. 5. Fig. 5 is a perspective view and a partial top view showing the second configuration example of the manufacturing apparatus according to this embodiment. In Fig. 5, the thick arrows indicate the direction of the magnetic flux generated by the magnet.

[0037] The manufacturing apparatus 1a according to the second configuration example shown in Figure 5 has a magnetic force fixing structure in which a gap is provided in the arrangement of adjacent split cores in the manufacturing apparatus 1, and adjacent split cores are treated as a single magnetic path as a magnetic circuit.

[0038] Specifically, the manufacturing apparatus 1a includes a reference member 30 serving as a reference member for the split cores 11 and 12. The reference member 30 includes a magnet 31, magnet holders 32 and 33 that are disposed on the split cores 11 and 12, respectively, to hold the magnet 31, and reference pins 34 and 35 that are disposed so as to contact the magnet holders 32 and 33. The magnet holders 32 and 33 and the reference pins 34 and 35 are formed of a ferromagnetic metal. The reference pins 34 and 35 are disposed so as to contact the recesses 11b and 12a, respectively, shown in FIG. 1. The reference pins 34 and 35 are fixed to a base such as a mold provided on at least one of the upper and lower sides of the housing portion, and can serve as a reference mold for forming the shapes of the split cores 11 and 12.

[0039] Thus, the reference member 30 includes ferromagnetic bodies (exemplified by the magnet holder 32 and reference pin 34, and the magnet holder 33 and reference pin 35, respectively) that contact the outer peripheral side surfaces of the split cores 11 and 12, and a bridging member that bridges between adjacent split cores 11 and 12. The bridging member includes magnets 31 that attract the split cores and are arranged so that they have different magnetic poles at the positions of adjacent split cores 11 and 12. As a result, magnetic flux flows as shown by the thick arrows in the enlarged top view of the split cores 11 and 12 shown in the lower part of Figure 5, attracting the split cores 11 and 12 to the reference member 30 and fixing them in the reference position.

[0040] Although not described further, reference members 30 are also arranged between the split cores 12 and 13, between the split cores 13 and 14, between the split cores 14 and 15, between the split cores 15 and 16, and between the split cores 16 and 11. As a result, for example, the split core 11 is attracted and fixed to a reference position by the reference members 30 at two locations, namely, the reference member 30 between the split cores 11 and 12 and the reference member 30 between the split cores 16 and 11. Similarly, the split cores 12 to 16 are also attracted and fixed to their respective reference positions by the reference members 30 at two locations. It is sufficient that two or more reference members 30 are arranged to correspond to one split core.

[0041] According to the second configuration example, even in the first configuration example, where it is difficult to increase the magnetic force of attraction to reference pins such as the reference member 21a serving as the molding reference by thinning the thickness of the non-magnetic or magnetic material, the magnetic flux can be efficiently passed through the split core, thereby obtaining a strong magnetic force. This allows the second configuration example to achieve effects such as improved positional accuracy and suppression of misalignment due to differences in linear expansion in high-temperature environments during adhesive curing. Furthermore, the second configuration example allows for the use of a magnetic material for the reference pins 34, 35 serving as the molding reference, allowing for the use of inexpensive materials such as hardened steel, which can be processed with high productivity and precision, and also increases the degree of freedom in the shape of the split core.

[0042] Next, a third configuration example of this embodiment will be described with reference to Fig. 6. Fig. 6 is a perspective view and a partial side view showing the third configuration example of the manufacturing apparatus according to this embodiment. In Fig. 6, the thick arrows indicate the direction of the magnetic flux generated by the magnet.

[0043] The manufacturing apparatus 1b according to the third configuration example shown in Figure 6 has a magnetic force fixing structure that does not manage the gaps between adjacent split cores in the manufacturing apparatus 1a, but instead uses multiple reference pins, such as two, that serve as molding references for one split core, thereby forming a magnetic circuit on one fixed object.

[0044] Specifically, the manufacturing apparatus 1b includes a reference member 40 as a reference member for the split core 11. The reference member 40 includes a magnet 41, magnet holders 42 and 43 arranged to hold the magnet 41, and reference pins 44 and 45 arranged to contact the magnet holders 42 and 43. The magnet holders 42 and 43 and the reference pins 44 and 45 are formed of a ferromagnetic metal. The reference pins 44 and 45 are arranged to contact the upper and lower regions of the recess 11b in FIG. 1, for example. Note that the recess 11b may have a shape that allows the two reference pins to be positioned and abut against each other. The reference pins 44 and 45 are fixed to bases such as molds provided on the upper and lower sides of the housing, respectively, and can form reference molds for molding the shape of the split core 11.

[0045] Thus, the reference member 40 includes two spaced apart ferromagnetic bodies (illustrated by the magnet holder 42 and reference pin 44, and the magnet holder 43 and reference pin 45, respectively) that contact the outer peripheral side of the split core 11, and a bridging member that bridges the two ferromagnetic bodies. The bridging member includes a magnet 41 that attracts the split core, and is arranged with opposite magnetic poles at the positions of the two ferromagnetic bodies. As a result, magnetic flux flows, as indicated by the thick arrows in the enlarged side view of the split core 11 shown in the lower part of Figure 6, attracting the split core 11 to the reference member 40 and fixing it in the reference position. A reference member 40 with a similar configuration can also be placed in the recess 11a in Figure 1. In this way, the reference member 40 can be placed in two locations relative to the split core 11.

[0046] Although not described here, two reference members 40 are similarly arranged for suction on each of the split cores 12, 13, 14, 15, and 16. The reference members 40 can be arranged in two or more locations per split core. However, if the gap is not provided, the reference member 40 may be arranged in only one location per split core.

[0047] The third configuration example achieves the same effect as the second configuration example, and compared to the second configuration example, it is possible to adopt an arrangement with or without a gap between adjacent split cores, thereby increasing the degree of freedom in the shape of the split cores.

[0048] Here, a comparative example will be used to provide a supplementary explanation of the effects of this embodiment. As a comparative example, we present an example in which split cores made of laminated steel plates are constrained in a forming jig, their shape is fixed by crimping welding and adhesives, and then the split cores are assembled to form an integrated core. Motors are required to be small, lightweight, and highly efficient, and to reduce magnetic loss, a small magnetic gap and high-precision shape are required. However, the comparative example uses crimping welding, which eliminates the insulating layer, making it difficult to achieve high-precision fixation. Furthermore, to precisely integrate the split cores used in stator cores from the perspective of productivity, high precision is required for the mating surfaces of the split cores and with other references. However, for the same reasons, high precision is difficult to achieve.

[0049] For example, one method involves impregnating the laminated core with adhesive, pressing the core against a mold (shape reference), and then allowing the adhesive to harden. However, unlike resin molding, adhesives can lead to poor mold release. This is due to the presence of a pressing part that applies a pressing force. Specifically, because the core is impregnated with a thermosetting adhesive, the adhesive can seep into the pressing part and the contact area with the mold (shape reference), reducing the core's mold release properties and potentially distorting the core during mold release. While adhesive can be applied between the laminated steel sheets to secure the core in place, the thickness of the adhesive layer can reduce the iron density. While applying an adhesive material beforehand and curing it after lamination can potentially prevent adhesive from seeping into the mold reference surface, the resulting adhesive layer becomes thicker, increasing magnetic loss.

[0050] Furthermore, when the core is impregnated with adhesive and molded, the adhesive often overflows, resulting in burrs. Specifically, because the adhesive has poor mold releasability and requires disassembly to release the core, it is difficult to create a closed mold, resulting in a partially open mold. However, because clearance is required between the mold and the core, if the core's position within the mold is not controlled, a large amount of unnecessary adhesive adheres to the periphery of the core after adhesive molding. Furthermore, in this case, the mold cannot be placed over the entire surface of the core. Because the mold generally has a smaller area than the core surface, adhesive burrs form at the corners between the core and the mold (the molding reference surface, the pressure surface). This can lead to concerns about reduced productivity and reduced shape accuracy due to burr removal. Furthermore, if the impregnating adhesive has the property of expanding upon curing, the adhesive may expand and overflow into gaps in the heated environment used for adhesive curing, further exacerbating these concerns. Furthermore, when the core is impregnated with adhesive and molded, the adhesive hardens and solidifies during pressure application, potentially leaving residual stress in the core and deteriorating its magnetic properties. Furthermore, when the core is impregnated with adhesive and molded in a mold, a mechanism is required to hold the core under pressure until the adhesive hardens after molding, and a mechanism is required to press the core against the mold in at least two directions, which increases the mold size and reduces the loading rate of the adhesive hardening oven.

[0051] On the other hand, in this embodiment, a structure is adopted in which the split core is fixed to a reference position by attracting it with a magnet only from the outer circumferential direction, thereby eliminating the concerns described with respect to the comparative example.

[0052] Finally, a method for manufacturing a laminated steel plate using such a manufacturing apparatus will be briefly described. This method for manufacturing a laminated steel plate includes an accommodation step and a pressing step. In the accommodation step, the plurality of steel plates are accommodated with the split cores arranged in the circumferential direction. In the pressing step, the arranged split cores are pressed from the stacking direction of the split cores. In the accommodation step, the split cores are arranged using a reference member including a magnet, which is located at a reference position for each split core when arranged, on a side surface of the split core in a direction perpendicular to the stacking direction.

[0053] The present disclosure is not limited to the above-described embodiment and may be modified as appropriate without departing from the spirit and scope of the present disclosure. For example, the materials of the magnets and other components are not critical as long as they function as those components. Furthermore, while the above-described embodiment assumes that the reference member is disposed on the outer circumferential side surface of the split core, the reference member can also be disposed on the inner circumferential side surface of the split core. In this case, for example, locating the reference member facing the recess in FIG. 1 is preferable compared to locating it further inward, due to ease of placement and fixation. However, when locating the reference member on the inner circumferential side surface of the split core, the reference member is not limited to the inner circumferential surface 11d, which faces the recess in FIG. 1, but can also be located on one or more of the inner circumferential surface 11d, the innermost circumferential surface 11e, or the side surface 11f between the inner circumferential surface 11d and the innermost circumferential surface 11e. Of course, the reference member fixes the split core using attractive force, so the reference member is positioned to determine the direction of attraction. Regarding the first configuration example shown in FIGS. 3 and 4 and the third configuration example shown in FIG. 6, for example, two reference members can be arranged only on the side surface 11f (only one surface, excluding the opposite side surface) shown in FIG. 1. Alternatively, a total of two reference members can be arranged on the side surface 11f (only one surface, excluding the opposite side surface) shown in FIG. 1 and the inner circumferential surface 11d shown in FIG. 1. Alternatively, a total of two reference members can be arranged on the inner circumferential surface 11d shown in FIG. 1 and an inner circumferential surface that is an arc-shaped portion similar to the inner circumferential surface 11d and sandwiches the side surface 11f. Alternatively, two reference members can be arranged on the innermost circumferential surface 11e. Regarding the second configuration example shown in FIG. 5, for example, reference members can be arranged on the innermost circumferential surfaces 11e of adjacent split cores. Alternatively, for adjacent split cores, a reference member can be placed between the inner peripheral surface 11d of one split core shown in Figure 1 and the inner peripheral surface of the other split core that is an arc portion similar to the inner peripheral surface 11d and sandwiches the side surface 11f.

[0054] In the above embodiment, the method of arranging the split cores in the laminated steel sheet manufacturing apparatus and laminated steel sheet manufacturing method has been mainly described, but the manufacturing apparatus and manufacturing process for manufacturing other parts are not limited to this. In addition, in the above embodiment, only an example in which the radial direction of the plurality of steel plates is fixed by a reference member has been given, but the plurality of steel plates can also be fixed by attracting them with a reference member including a similar magnet from the horizontal direction of the plurality of steel plates, i.e., from a direction perpendicular to the stacking direction of the plurality of steel plates. [Explanation of symbols]

[0055] 1, 1a, 1b... laminated steel plate manufacturing apparatus, 10... laminated steel plate, 11, 12, 13, 14, 15, 16... divided laminated steel plate (divided core), 11a, 11b, 12a, 12b, 13a, 13b, 14a, 14b, 15a, 15b, 16a, 16b... recesses, 21a, 21b, 22a, 22b, 23a, 23b, 24a, 24b, 25a, 25b, 26a, 26b, 30, 40... reference member, 31, 41... magnet, 32, 33, 42, 43... magnet holding portion, 34, 35, 44, 45... reference pin.

Claims

1. A laminated steel sheet manufacturing apparatus for manufacturing laminated steel sheets used for a stator core of a motor, a housing portion that houses the plurality of circumferentially divided and stacked steel plates in a state in which the divided laminated steel plates, which are the individual divided parts, are arranged in the circumferential direction; A pressing portion that presses the arranged divided laminated steel plates from the stacking direction of the divided laminated steel plates; Equipped with the accommodation portion is a reference position for each of the divided laminated steel plates when they are arranged, and includes a reference member including a magnet, the reference member being arranged at a reference position on a side surface of the divided laminated steel plate in a direction perpendicular to the lamination direction, the reference member includes a ferromagnetic body that contacts an outer peripheral side surface or an inner peripheral side surface of the divided laminated steel plate, and a bridging member that bridges between adjacent divided laminated steel plates, The bridge member includes, as the magnet, magnets arranged so as to have different magnetic poles at positions of adjacent divided laminated steel plates. Laminated steel plate manufacturing equipment.

2. A laminated steel sheet manufacturing apparatus for manufacturing laminated steel sheets used in a stator core of a motor, comprising: a housing portion that houses the plurality of circumferentially divided and stacked steel plates in a state in which the divided laminated steel plates, which are the individual divided parts, are arranged in the circumferential direction; A pressing portion that presses the arranged divided laminated steel plates from the stacking direction of the divided laminated steel plates; Equipped with the accommodation portion is a reference position for each of the divided laminated steel plates when they are arranged, and includes a reference member including a magnet, the reference member being arranged at a reference position on a side surface of the divided laminated steel plate in a direction perpendicular to the lamination direction, the reference member includes two ferromagnetic bodies spaced apart from each other and in contact with an outer peripheral side surface or an inner peripheral side surface of the divided laminated steel plate, and a bridging member bridging between the two ferromagnetic bodies, the bridge member includes, as the magnet, a magnet arranged to have different magnetic poles at the positions of the two ferromagnetic bodies; Laminated steel plate manufacturing equipment.

3. A method for manufacturing a laminated steel sheet used in a stator core of a motor, comprising the steps of: a housing step of housing the plurality of circumferentially divided and stacked steel plates in a state in which the divided laminated steel plates, which are the individual divided parts, are arranged in the circumferential direction; A pressing step of pressing the arranged divided laminated steel plates from the stacking direction of the divided laminated steel plates; Equipped with The storing step includes arranging the divided laminated steel plates using a reference member including a magnet, the reference member being disposed at a reference position on a side surface of the divided laminated steel plate in a direction perpendicular to the lamination direction, as a reference position when arranging each of the divided laminated steel plates; the reference member includes a ferromagnetic body that contacts an outer peripheral side surface or an inner peripheral side surface of the divided laminated steel plate, and a bridging member that bridges between adjacent divided laminated steel plates, The bridge member includes, as the magnet, magnets arranged so as to have different magnetic poles at positions of adjacent divided laminated steel plates. Laminated steel plate manufacturing method.

4. A method for manufacturing a laminated steel plate used in a stator core of a motor, comprising: a housing step of housing the plurality of circumferentially divided and stacked steel plates in a state in which the divided laminated steel plates, which are the individual divided parts, are arranged in the circumferential direction; A pressing step of pressing the arranged divided laminated steel plates from the stacking direction of the divided laminated steel plates; Equipped with The storing step includes arranging the divided laminated steel plates using a reference member including a magnet, the reference member being disposed at a reference position on a side surface of the divided laminated steel plate in a direction perpendicular to the lamination direction, as a reference position when arranging each of the divided laminated steel plates; the reference member includes two ferromagnetic bodies spaced apart from each other and in contact with an outer peripheral side surface or an inner peripheral side surface of the divided laminated steel plate, and a bridging member bridging between the two ferromagnetic bodies, the bridge member includes, as the magnet, a magnet arranged to have different magnetic poles at the positions of the two ferromagnetic bodies; Laminated steel plate manufacturing method.

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