Laminated core manufacturing apparatus

Abstract

Disclosed is a laminated core manufacturing apparatus. The laminated core manufacturing apparatus according to an embodiment of the present invention comprises: an upper mold that can be lifted; a lower mold provided under the upper mold; a material guide provided on the lower mold to guide the transfer of a metal strip passing between the upper mold and the lower mold; and a magnetic ball provided on the material guide to pull the edge of the material up by magnetic force. According to the present invention, catching of the material during transfer can be reduced, transfer resistance of the material can be reduced due to point contact between the magnetic ball and the material, the material can be lifted by magnetic force and pass through the inside of the molds without difficulty, and the material can be smoothly transferred while the magnetic ball rolls.

Description

Stacked core manufacturing device

[0001] The present invention relates to a laminated core manufacturing device, and more specifically, to a laminated core manufacturing device capable of lifting both sides of a material upward by magnetic force for smooth material transport.

[0002] Generally, a laminated core refers to a core manufactured by integrating multiple laminas, and is used as a core for rotating devices such as rotor cores and stator cores, or as a core for various devices such as transformers or ignition systems.

[0003] Manufacturing methods for joining (combining) the above laminas include a tab fixing method using an interlock tab, a welding fixing method using welding, such as laser welding, and a rivet fixing method.

[0004] In order to manufacture the laminated core using the above tab fixing method, the lamina is provided with the embossing protrusion (also called an interlock tab or caulking protrusion), and an example of manufacturing the laminated core using the tab fixing method is disclosed in Korean Registered Patent No. 10-1881257, etc.

[0005] Recently, a technique for bonding the interfaces of the aforementioned laminas with an adhesive, namely an adhesive fixation method, has been used in the manufacture of laminated cores. For example, an invention in which an adhesive is applied to the surface of a material supplied to a mold, namely a metal strip, and the metal strip is punched to manufacture a laminated core by an adhesive method is disclosed in Korean Registered Patent No. 10-1990697, etc. Additionally, an example of manufacturing an adhesive laminated core by receiving a metal strip coated with an adhesive is disclosed in Korean Registered Patent No. 10-2691827, etc.

[0006] For the manufacture of the above-mentioned laminated core, a progressive die type laminated core manufacturing device in which a plurality of tools are arranged is used. FIG. 1 is a drawing showing an example of a laminar and a laminated core, in which a laminated core (C) is formed by combining laminas (L). Of course, the shape of the laminar is not limited to the example in FIG. 1 and varies.

[0007] FIG. 2 is a general press die type laminated core manufacturing device viewed from a direction perpendicular to the material transport direction, comprising an upper die (10) that can be raised and lowered, a lower die (20) provided below the upper die (10), and at least one punch (30) provided in the upper die. The upper die (10) may be provided with an embossing punch that forms an embossing protrusion on the material for a tab fixing method, and the upper die and / or lower die may be provided with an adhesive applicator for an adhesive fixing method.

[0008] A pair of material guides (40) that guide the movement of the material are provided on the upper side of the lower die (20), and the material (S) is processed while traveling along the material transfer path (41) between the material guides (40). However, a problem may occur where the material (S) gets caught on the upper side of the lower die or on parts such as a processing die provided in the lower die, or on a laminar formed by scrap or blanking during the transfer, so that the transfer of the material does not proceed smoothly.

[0009] The present invention aims to provide a laminated core manufacturing device capable of transporting a material (strip) passing through the upper side of a lower mold while lifting both sides of the material upward by magnetic force.

[0010] One embodiment of the present invention provides a stacked core manufacturing apparatus comprising: an upper die capable of being raised or lowered; a lower die provided on the lower side of the upper die; a material guide provided on the lower die to guide the transport of a material passing between the upper die and the lower die; and a magnetic ball provided on the material guide to pull the edge portion of the upper material upward by magnetic force.

[0011] The above material guide includes a cover portion spaced upward from the bottom of the material transport path through which the material passes to cover the edge portion of the material; the magnet ball is provided in the cover portion; and the cover portion may include a magnet receiving portion for receiving the magnet ball.

[0012] The above cover portion is a non-magnetic material, and the magnet ball may be provided to roll in the magnet receiving portion.

[0013] The above material guide further includes a guide base fixed to the lower die to block the widthwise edge of the material; and the cover portion may be fixed to the guide base. The guide base and the cover portion may be made of different materials.

[0014] The cover portion may have a magnet exposure opening formed at the bottom of the magnet receiving portion and exposing the surface of the magnet ball to protrude downward from the cover portion. The magnet ball may be inserted through the magnet exposure opening; and a caulking portion may be formed around the magnet exposure opening to prevent the magnet ball from coming loose.

[0015] The magnet receiving portion may have a magnet insertion portion formed on the upper surface of the cover portion. A caulking portion may be formed around the magnet insertion portion to prevent the magnet ball from detaching.

[0016] According to the present invention, jamming during material transport can be improved, the transport resistance of the material can be reduced due to point contact between the magnetic ball and the material, the material can be lifted by magnetic force and pass smoothly through the inside of the mold, and the rolling of the magnetic ball helps the smooth transport of the material.

[0017] The features and advantages of the present invention can be better understood by referring to the drawings described below together with the detailed description of embodiments of the present invention described below, and among the drawings:

[0018] FIG. 1 is a perspective view showing an example of a laminar and a laminated core;

[0019] FIG. 2 is a drawing showing an example of a conventional laminated core manufacturing device perpendicular to the material transfer direction;

[0020] FIG. 3 is a schematic diagram showing one embodiment of a laminated core manufacturing apparatus according to the present invention;

[0021] FIG. 4 is a side view showing the lower mold of the laminated core manufacturing device illustrated in FIG. 3;

[0022] FIG. 5 is a plan view showing a part of the lower mold shown in FIG. 4;

[0023] FIG. 6 is a cross-sectional view showing an embodiment of a material guide by enlarging section "A" of FIG. 4;

[0024] FIG. 7 is a drawing showing the state in which a material is attached to the magnet ball illustrated in FIG. 6; and

[0025] FIG. 8 is a cross-sectional view showing another embodiment of a material guide applicable to part "A" of FIG. 4.

[0026] Hereinafter, preferred embodiments of the present invention, in which the objectives of the present invention can be specifically realized, will be described with reference to the accompanying drawings. In describing these embodiments, the same names and reference numerals are used for identical components, and additional descriptions thereof are omitted below.

[0027] The terms used in this specification are for describing embodiments of the present invention and are not intended to limit the invention. Furthermore, in this specification, terms such as "comprising" or "having" should be understood as not excluding the possibility of adding other features or components other than those described in the specification.

[0028] The laminated core manufacturing device according to the present embodiment is a press mold type device that sequentially forms multiple laminas (L) through a blanking process, and a laminated core (C) can be manufactured by joining the laminas inside or outside the mold.

[0029] Referring to FIGS. 3 to 7, the stacked core manufacturing device (100) includes an upper die (110) that can be raised and lowered, a lower die (120) provided on the lower side of the upper die, and a material guide (130) provided on the lower die (120).

[0030] In this embodiment, the upper die (110) is provided with at least one punch (130), and the punch (140) processes a strip-shaped material (S) that is intermittently transported between the upper die and the lower die. The lower die (120) includes a processing die (150) facing the punch (140).

[0031] In order to form the laminar (L) by processing the material (S), such as an electrical steel sheet, passing between the upper die (110) and the lower die (120), the upper die (110) may be equipped with a plurality of punches (140). Therefore, in this embodiment, the laminated core manufacturing device (100) may include a progressive die in which a plurality of punches (141, 142, 143, 144, 145) are arranged along the conveying direction of the material (S).

[0032] The above punches (140) sequentially process the material (S) to form the laminar (L) in a preset shape to realize the shape of the laminated core, and may include, for example, at least one punch (141, 142, 143) for forming a groove or hole in the laminar.

[0033] To explain the present embodiment more specifically, the punches (140) include at least one piercing punch (141, 142, 143) for forming a hole in the strip and a blanking punch (144) for blanking the material (S) to form the laminar.

[0034] The above piercing punches (141, 142, 143) are punches for realizing the shape of the laminated core, such as slots, magnet holes, or center holes (shaft holes) of the laminated core, and are placed in the upper die (110) according to the design of the laminated core. In addition, the progressive die may be equipped with a pilot punch (145; Pilot Punch), and the number and shape of the punches may vary depending on the structure of the laminated core.

[0035] A press die of a laminated core manufacturing device that joins laminas (L) by a tab fixing method may be equipped with an embossing punch (not shown). The embossing punch is a punch that forms embossing protrusions on the material for the tab fixing method.

[0036] In contrast, the press die of a laminated core manufacturing device that joins laminas by an adhesive fixing method may be equipped with a tool for applying adhesive to the material, namely an adhesive applicator. Of course, when manufacturing a laminated core by an adhesive fixing method using a material called a steel plate, which has an adhesive coating layer formed on its surface, so-called SB steel plate, the adhesive applicator may be omitted.

[0037] In addition, in the present embodiment, the lower die (20) includes at least one forming die (151, 152, 153) facing the at least one piercing punch (141, 142, 143) and a stacking die (154) facing the blanking punch (144). The stacking die (154) includes the blanking die, and a back pressure unit (160) may be provided below the stacking die (154) so ​​as to be vertically movable. Also, the lower die (120) may be provided with a pilot die (155) facing the pilot punch (145).

[0038] The blanking punch (144) punches the material (S) that is intermittently conveyed to sequentially form the laminas. The stacking die (154) forms a stacking space for the laminas and is provided below the blanking punch (144) so ​​that the laminas pass through while stacked.

[0039] In the above lamination die (154), the laminas may be bonded by embossing protrusions or adhesive, and the lamination cores (C) are sequentially manufactured by the bonding of the laminas. The lamination die (154) may be rotatably provided in the lower die.

[0040] The positions of the tools processing the strip in the preceding stage of the blanking punch (144) are not limited to the example of FIG. 2, and the upper die (110) may include a punch plate, a punch back plate, and an upper holder, and the lower die (120) may include a die plate (121) and a lower holder (122), and a holder support (123), i.e., a sub-bolster, may be provided on the lower side of the lower holder (122), and the upper die of the mold may be mounted on the slide (also called a 'ram') of the press and the lower die may be mounted on the bolster of the press to form a press mold. In FIG. 3, drawing number 111 is a stripper.

[0041] In this embodiment, the material guide (130) is provided on the upper part of the lower mold (120), forms an edge boundary wall of the passage through which the material passes, i.e., the material transport path (130a), and guides the movement of the material (S).

[0042] This embodiment further includes a magnetic ball (170) provided in the material guide (130) to pull the edge portion of the upper material upward by magnetic force.

[0043] The material guide (130) includes a cover portion (131) spaced upward from the bottom (130b) of the strip passage through which the material passes. The cover portion (131) covers the edge portion of the material transport path (130a), and accordingly, the material guide wraps around the edge of the material.

[0044] And the magnet ball (170) is provided in the cover portion (131), and the cover portion (131) includes a magnet receiving portion (131a) that accommodates the magnet ball (170), and the cover portion (131) can cover the edge portion of the material at the edge portion of the material transfer path (130a).

[0045] In this embodiment, the cover portion (131) is composed of a non-magnetic material such as aluminum or copper to which magnets do not adhere, and the magnet ball (170) can be provided to roll in the magnet receiving portion (131a). That is, the magnet receiving portion (131a) has clearance, or play, so that the magnet ball (170) can roll.

[0046] The above material guide (130) restricts the widthwise movement of the material (S). To block one edge and the other edge of the material (S), the material guide (130) may be provided along two guide lines parallel to the upper surface of the lower die (120).

[0047] The above material guide (130) may be formed as a long, integral structure along the direction of transport of the material, or it may be divided into multiple sections spaced apart along the direction of transport of the material as shown in the example in FIG. 5.

[0048] The above material guide (130) further includes a guide base (132) fixed to the lower mold (120) to block the widthwise edge of the material (S); the cover portion (131) is provided on the guide base (132). The cover portion (131) and the guide base (132) may be integral. Of course, the cover portion (131) may be coupled to the guide base (132) and may be made of a different material or the same material.

[0049] In this embodiment, the cover portion (131) has a magnet exposure opening (131b) formed at the bottom of the magnet receiving portion (131a). The surface of the magnet ball (170) can be exposed through the magnet exposure opening (131b). More specifically, the surface of the magnet ball (170) can protrude below the bottom surface of the cover portion (131). When the surface of the magnet ball (170) is exposed below the cover portion (131) through the magnet exposure opening (131b) and the material (S) is attached to the surface of the magnet ball (170) as in the example shown in FIG. 7, both sides of the material (S) can be separated from the bottom of the material transfer path (130a).

[0050] In order for the material (S) to be separated from the bottom of the material transport path (130a) by the magnetic ball (170), the gap between the bottom of the material transport path (130a) and the cover part (131) is greater than the thickness of the material (S).

[0051] As in the present embodiment, the magnet ball (170) can be inserted through the magnet opening (131b). To prevent the magnet ball (170) from coming loose, a ball restraint may be provided at the opening into which the magnet ball (170) is inserted, i.e., the magnet opening (131b) in the present embodiment. For example, the ball restraint may include a caulking portion (not shown) formed locally or entirely around the magnet opening (131b). The magnet receiving portion (131a) may have a hollow portion of various shapes, such as a square box or a cylinder, and a hole communicating with the magnet receiving portion may be added to the cover portion, through which the magnet ball can be pushed or a lubricant can be injected.

[0052] FIG. 6 is an example of a structure in which the magnet ball (170) is inserted through the magnet opening (131b). More specifically, before the magnet ball (170) is inserted into the cover portion (131), the magnet opening (131b) is larger than the magnet ball (170), and after the insertion of the magnet ball (170), the periphery of the magnet opening (131b) can be caulked. That is, by the caulking process, the size of the magnet opening (131b) can be made smaller than the diameter of the magnet ball.

[0053] Referring to FIG. 8, the magnet receiving portion (131a) may have a magnet insertion portion (131c) formed on the upper side of the cover portion (131). A magnet exposure portion (131b) is formed on the bottom of the magnet receiving portion (131a). A ball restraint portion may be provided in the opening into which the magnet ball (170) is inserted, i.e., the magnet insertion portion (131c) in this embodiment. To prevent the magnet ball (170) from being removed after it is inserted through the magnet insertion portion (131c), the ball restraint portion may include a caulking portion formed around the magnet insertion portion (131c).

[0054] In this embodiment, the material guide (130) is provided on the die plate (121) of the lower die, and the material guide (130) has an angle shape to wrap around the edge of the material.

[0055] Accordingly, the present embodiment may be a stacked core manufacturing device of the progressive mold type having a material guide (130) equipped with the magnetic ball (170).

[0056] As described above, preferred embodiments according to the present invention have been examined, and it is obvious to those skilled in the art that, in addition to the embodiments described above, the present invention may be embodied in other specific forms without departing from the spirit or scope thereof.

[0057] Therefore, the embodiments described above should be regarded as exemplary rather than restrictive, and accordingly, the present invention is not limited to the description above but may be modified within the scope of the appended claims and their equivalents.

[0058] The present invention can be used for manufacturing cores for motors or generators, and according to the present invention, smooth transfer of metal strips is possible in a mold for manufacturing laminated cores.

Claims

1. A movable figure and; A lower mold provided on the lower side of the upper mold; A material guide provided in the lower die to guide the transport of a material passing between the upper die and the lower die; A stacked core manufacturing apparatus comprising a magnetic ball provided in the material guide to pull the edge portion of the upper material upward by magnetic force.

2. In Paragraph 1, A laminated core manufacturing apparatus wherein the above material guide includes a cover portion spaced upward from the bottom of the material transport path to cover the edge portion of the material transport path through which the material passes; the magnet ball is provided in the cover portion; and the cover portion includes a magnet receiving portion for receiving the magnet ball.

3. In Paragraph 2, A laminated core manufacturing device in which the above cover portion is a non-magnetic material and the above magnet ball is provided to roll in the above magnet receiving portion.

4. In Paragraph 3, The above material guide further includes a guide base fixed to the lower die to block the widthwise edge of the material; and the cover portion is a laminated core manufacturing device fixed to the guide base.

5. In any one of paragraphs 2 through 4, The above cover part is; A stacked core manufacturing device having a magnet exposure opening formed at the bottom of the magnet receiving portion and exposing the surface of the magnet ball to protrude downward from the cover portion.

6. In Paragraph 5, A laminated core manufacturing device in which the magnet ball is inserted through the magnet exposure port; and a caulking portion is formed around the magnet exposure port to prevent the magnet ball from coming loose.

7. In Paragraph 5, The above magnet receiving portion is a laminated core manufacturing device having a magnet insertion portion formed on the upper side of the cover portion.

Images