Manufacturing equipment for laminated steel sheets for motors

Abstract

To provide a manufacturing apparatus of a lamination steel plate for a motor which depresses occurrence of a burr of an adhesive and forms the plate in a highly precise shape.SOLUTION: A manufacturing apparatus of a lamination steel plate for a motor 100 comprises a housing part 101 which has an opening for housing a plurality of laminated core plates 110, a pressing part 102 for pressing the plurality of core plates, and a sheet 103 disposed between the pressing part and the housing part. The pressing part includes an elastic body 104 having a face smaller than an upper face of the opening of the housing part, and presses the plurality of core plates via the sheet by the elastic body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a manufacturing apparatus for laminated steel sheets for motors. [Background technology]

[0002] Patent Document 1 discloses a manufacturing device that cuts out core plates, stacks multiple core plates, heats and softens adhesive, applies the softened adhesive to the ends of the stacked core plates, presses the multiple core plates together, and then hardens the resin to produce laminated steel plates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-519721 Summary of the Invention [Problem to be solved by the invention]

[0004] Motors are constantly being required to be small, lightweight, and highly efficient. To improve efficiency, it is important to reduce the magnetic loss of the motor, and a method of reducing loss using laminated steel sheets has been adopted. However, it is necessary to reduce the magnetic gap and achieve high precision in the shape, and it is difficult to precisely fix the steel sheets using welding methods that join multiple steel sheets together.

[0005] Furthermore, from the viewpoint of productivity, split-core motor structures are used, but splitting the core requires high precision in the mating surfaces, which makes it difficult to achieve high precision for the same reasons as above.

[0006] Meanwhile, Patent Document 1 discloses a method for manufacturing a laminated steel plate in which an adhesive is applied to one end of multiple core plates, the core plates are pressed with a mold, and then the adhesive is cured. However, unlike resin molding, there is a concern that manufacturing methods using an adhesive may result in poor mold releasability. Furthermore, if an adhesive is impregnated between the stacked core plates to strengthen the fixation of the multiple core plates, the thickness of the adhesive reduces the metal density of the laminated steel plate, resulting in magnetic loss in the motor.

[0007] Furthermore, since the adhesive has the property of expanding during the curing process, there is also the problem that the adhesive may overflow at the edges of the laminated steel sheets, causing numerous burrs.

[0008] The present disclosure has been made to solve such problems, and aims to provide a manufacturing device for laminated steel sheets for motors that suppresses the occurrence of adhesive burrs and forms them into high-precision shapes. [Means for solving the problem]

[0009] The present disclosure provides a manufacturing apparatus for laminated steel sheets for motors, which includes a storage section having an opening for storing multiple stacked core plates, a pressing section for pressing the multiple core plates, and a sheet between the pressing section and the storage section, wherein the pressing section includes an elastic body having a surface smaller than the upper surface of the opening of the storage section, and the elastic body presses the multiple core plates via the sheet. This makes it possible to provide a manufacturing apparatus for laminated steel sheets for motors that suppresses the generation of adhesive burrs and forms them into high-precision shapes.

[0010] The sheet may have a water-repellent surface, which makes it easier to efficiently remove adhesive burrs.

[0011] The sheet may have a portion that is larger than the contact area between the elastic body and the plurality of core plates and extends outward from the opening, and the extending portion may be configured to tilt in the direction of gravity at least when the plurality of core plates are pressed by the pressing portion. By using such a configuration, it becomes easy to efficiently remove adhesive burrs. [Effects of the Invention]

[0012] The present disclosure makes it possible to provide a manufacturing device for laminated steel sheets for motors that suppresses the occurrence of adhesive burrs and forms the sheets into highly accurate shapes. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of a laminated steel sheet for motors according to the present disclosure and a manufacturing apparatus for the laminated steel sheet for motors. [Figure 2] 3A to 3C are diagrams illustrating a manufacturing process of a laminated steel sheet for a motor according to the present disclosure and a mechanism for removing adhesive burrs. [Figure 3] 10A and 10B are diagrams illustrating the generation of burrs due to misalignment between a core plate and a pressing portion according to the present disclosure. [Figure 4] 10 is a diagram illustrating the generation of burrs when the sheet is not used in the manufacturing apparatus for laminated steel sheets for motors according to the present disclosure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 shows a laminated steel sheet for motors according to the present embodiment, and the configuration of a manufacturing apparatus for the laminated steel sheet for motors.

[0015] The manufacturing apparatus 100 for laminated steel sheets for motors shown in FIG. 1 includes a storage section 101 and a pressing section 102.

[0016] The accommodation portion 101 has an opening in which a plurality of stacked core plates 110 are accommodated. Between the accommodation portion 101 and the pressing portion 102, there is a sheet 103 having a water-repellent surface. The pressing portion 102 also includes a heat-resistant elastic body 104.

[0017] The core plate 110 has a pressure surface 111, a molding reference surface 112, and a side surface 113. The core plate 110 is accommodated so that the molding reference surface 112 faces the bottom surface of the opening. The elastic body 104 has a surface that is smaller than the opening surface of the opening of the accommodation section 101. An adhesive 105 is filled between the side surface of the core plate 110 and the accommodation section 101. The elastic body 104 presses the pressure surface 111 of the core plate 110 via the sheet 103 (see the lower right diagram in Figure 1).

[0018] 1 has a structure in which elastic body 104 is provided, which makes it possible to absorb shape differences between core plate 110 and pressure surface 111 or molding reference surface 112 of the molding die (inside accommodating section 101). In this way, the generation of space between core plate 110 and the molding die is prevented, which suppresses the generation of adhesive burrs and improves shape accuracy. Note that elastic body 104 may be provided between the bottom surface of accommodating section 101 and molding reference surface 112, and the position of elastic body 104 is not particularly limited as long as the purpose of preventing shape differences is achieved.

[0019] The elastic body 104 is preferably a heat-resistant silicone sheet or silicone rubber. The thickness of the elastic body 104 is not particularly limited, but it is sufficient to absorb the shape difference if it is about 2 mm.

[0020] Sheet 103 preferably has shape-following properties that allow it to deform along the shape of core plate 110, strength that prevents breakage due to deformation, and releasability that allows it to be removed after being pressed. Examples of materials for sheet 103 include fluororesins such as PTFE (polytetrafluoroethylene).

[0021] Furthermore, the pressurized surface 111 of the core plate 110 may have fractures caused by pressing or laser. These fractures on the pressurized surface 111 may bite into the elastic body 104 during pressing, resulting in poor demoldability. This may cause distortion of the manufactured laminated steel sheet during demolding.

[0022] If elastic body 104 were to come into direct contact with a fractured portion of pressure surface 111, the fractured portion would bite into the elastic body, which could further deteriorate mold releasability. Therefore, by sandwiching sheet 103 between pressure surface 111 and elastic body 104, sheet 103 deforms to conform to the shape of the part, making it possible to prevent the fractured portion from biting into the elastic body. Therefore, by providing sheet 103, mold releasability can be ensured.

[0023] The accommodation section 101 is not completely sealed, but has an opening in a portion thereof, leaving the space open. The sheet 103 has a portion that is larger than the contact area of the core plate 110 and extends outward beyond the opening. The extending portion is structured to tilt in the direction of gravity at least when the multiple core plates are pressed by the pressing section.

[0024] The extending portion may be configured to tilt in the direction of gravity even when not being pressed. With this configuration, the effects described below can be achieved at least in the temperature range from when adhesive 105 is heated to soften it to when it is subsequently hardened.

[0025] Next, the manufacturing process of the laminated steel sheet for motors according to this embodiment and the mechanism for removing adhesive burrs will be described with reference to Fig. 2, which is an enlarged view of the dashed line portion shown in the lower right diagram of Fig. 1. Here, for convenience, the five diagrams shown in Fig. 2 are referred to as Fig. 1, Fig. 2, Fig. 3, Fig. 4, and Fig. 5 from left to right.

[0026] As shown in FIG. 2, a core plate 110 is placed in the housing 101 at room temperature and filled with adhesive 105. Next, as shown in FIG. 2, the adhesive 105 is heated to soften it and filled between the housing 101 and the core plate 110. As the curing reaction of the adhesive 105 progresses, the adhesive 105 expands and protrudes above the housing 101. As shown in FIG. 3, taking advantage of the water-repellent properties of the sheet 103, i.e., the small contact angle between the sheet 103 and the adhesive 105, the hardened adhesive 105 forms burrs 120 and separates from the top of the housing 101. Then, as shown in FIG. 4, the water-repellent properties of the sheet 103 allow the burrs 120 to move from the core plate 110 to the extended portion of the sheet 103 and be expelled. Finally, as shown in FIG. 5, the core plate 110 is taken out of the housing portion 101, and the core plate 110 in which burrs of the adhesive 105 are suppressed is obtained.

[0027] In this way, it is possible to prevent burrs 120 of adhesive 105 from remaining on core plate 110.

[0028] Next, with reference to FIG. 3, the occurrence of burrs due to misalignment between the core plate 110, particularly the upper surface, and the pressing portion 102 will be described.

[0029] Because the pressing portion 102 slides, it cannot perfectly match the shape of the upper surface of the core plate 110, and a gap 121 is formed when the pressing portion 102 is pressed. The adhesive 105 penetrates into this gap 121, causing burrs to form, which leads to a decrease in productivity and shape accuracy due to the need to remove the burrs. The manufacturing apparatus 100 for laminated steel sheets for motors according to this embodiment can suppress the formation of burrs by providing an elastic body 104 and a sheet 103 between the core plate 110 and the pressing portion 102.

[0030] Fig. 4 is a diagram illustrating the generation of burrs when the sheet is not used in the manufacturing apparatus for laminated steel sheets for motors according to this embodiment. For convenience, the four diagrams shown in Fig. 4 are referred to as Fig. 1, Fig. 2, Fig. 3, and Fig. 4 from the left. Also, explanations of parts that are the same as those in Fig. 2 may be omitted.

[0031] As shown in FIG. 1 of FIG. 4, core plate 110 is placed in housing portion 101 at room temperature and filled with adhesive 105. Sheet 103 does not have a portion extending beyond the opening. Next, adhesive 105 is heated and softened. As the curing reaction progresses, adhesive 105 expands and protrudes above housing portion 101 (see FIG. 2). Because sheet 103 does not have such an extending portion, the expanded adhesive 105 hardens with a portion in contact with housing portion 101 (see FIG. 3). As a result, as shown in FIG. 4, when core plate 110 is removed from housing portion 101, burrs 120 of adhesive 105 remain.

[0032] In this way, by using the manufacturing apparatus of the present disclosure, it is possible to suppress the occurrence of adhesive burrs and obtain laminated steel sheets for motors that are formed into a highly accurate shape.

[0033] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the present disclosure. [Explanation of symbols]

[0034] 100 Manufacturing equipment for laminated steel sheets for motors 101 Storage unit 102 Pressing part 103 seats 104 Elastic Body 105 Adhesive 110 Multiple Core Plates 111 Pressure surface 112 Molding reference surface 113 Side 120 Bali 121 Gap

Claims

1. a housing portion having an opening for housing a plurality of stacked core plates; a pressing portion that presses the plurality of core plates; a sheet between the pressing portion and the storage portion, The pressing portion includes an elastic body, and presses the plurality of core plates by the elastic body via the sheet, the sheet has a portion that is larger than the contact area between the elastic body and the plurality of core plates and that extends outward beyond the openings, The extending portion is structured to tilt in the direction of gravity at least when the plurality of core plates are pressed by the pressing portion. Manufacturing equipment for laminated steel sheets for motors.

2. The sheet has a water-repellent surface The manufacturing apparatus for laminated steel sheets for motors according to claim 1.

3. The elastic body has a surface that is smaller than the upper surface of the opening of the accommodating portion. The manufacturing apparatus for laminated steel sheets for motors according to claim 1.

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