Laminated core manufacturing apparatus

Abstract

Disclosed is a laminated core manufacturing apparatus. A laminated core manufacturing apparatus according to the present invention is a laminated core manufacturing apparatus for manufacturing a laminated core by blanking a band-shaped material which is being intermittently transferred, and comprises: a first blanking unit movable in the width direction of the material; a second blanking unit provided on one side of the first blanking unit so as to be movable in the width direction of the material; and a driving device having a motor, connected to the first blanking unit and the second blanking unit, in order to change the blanking positions of the first blanking unit and the second blanking unit. According to the present invention, the number of motors moving the blanking units can be reduced, and thus the cost of a laminated core manufacturing apparatus can be reduced, the motor-specific deviation generated when each blanking unit is driven by one of the motors can be reduced, and excessive driving of the motors can be improved.

Description

Stacked core manufacturing device

[0001] The present invention relates to a core manufacturing apparatus for manufacturing a core, and more specifically, to a laminated core manufacturing apparatus having a plurality of blanking units that change the blanking position while moving in the width direction of the material.

[0002] A laminated core is a laminated structure manufactured by bonding metal sheets, or laminas, and is used as a core for various devices, such as rotor cores and stator cores for rotating machinery, transformers, or ignition systems.

[0003] Examples of methods for manufacturing a laminated core by combining the above laminas include a tab fixing method using an interlock tab, i.e., an embossed protrusion, a welding fixing method using welding, such as laser welding, and a rivet fixing method.

[0004] In order to join the laminas using the above tab fixing method, the embossing protrusion (also called an interlock tab or caulking protrusion) is formed on the lamina, and an example of manufacturing a laminated core using the tab fixing method is disclosed in Korean Patent Publication No. 10-2208-0067426, etc.

[0005] Another example of the above-mentioned method for manufacturing a laminated core is a technique for bonding the interfaces of laminas with an adhesive, namely the adhesive fixing method. For example, an example of manufacturing an adhesive laminated core by applying an adhesive to the surface of a strip-shaped material, such as a metal strip, and punching the metal strip is disclosed in Registered Patent No. 10-1566491, etc. Additionally, an example of manufacturing an adhesive laminated core using a strip (also referred to as an "SB" steel plate) that has been pre-coated with an adhesive is disclosed in Registered Patent No. 10-2691827, etc.

[0006] An example of a device for manufacturing the above-mentioned laminated core is a stamping device, specifically a press die, that blanks material intermittently conveyed in the longitudinal direction (X-axis direction) to sequentially form and stack laminas. Recently, progressive die type laminated core manufacturing devices have been used for manufacturing the above-mentioned laminated core.

[0007] The above-mentioned laminated core is a laminate in which the above-mentioned laminas are joined together in an overlapping manner, and since the material used to manufacture the above-mentioned laminated core has thickness variations depending on the region, it also affects the quality, such as perpendicularity and parallelism, of the laminated core manufactured from said material.

[0008] To improve this, a stacked core manufacturing device is used in which a plurality of blanking units moving in the width direction of the material change the blanking position to form and stack laminas, and as shown in FIG. 1, a motor (M) is connected to each of the blanking units (11, 12, 13, 14) to change the position of the blanking unit.

[0009] The present invention aims to provide a laminated core manufacturing apparatus comprising at least one group of blanking sets having a plurality of blanking units that move in the width direction of the material by a single motor.

[0010] One embodiment of the present invention provides a stacked core manufacturing apparatus for manufacturing a stacked core by blanking a strip-shaped material that is intermittently conveyed, comprising: a first blanking unit movable in the width direction of the material; a second blanking unit provided on one side of the first blanking unit so as to be movable in the width direction of the material; and a driving device having a motor connected to the first blanking unit and the second blanking unit to change the blanking position of the first blanking unit and the second blanking unit.

[0011] The first blanking unit and the second blanking unit punch the material while moving in opposite directions. The driving device further includes a transmission device connected to the motor that moves the first blanking unit and the second blanking unit in opposite directions.

[0012] The above-mentioned electric drive device may include a gear electric drive device that rotates by the motor. A ball screw driven by the electric drive device is installed in the first blanking unit and the second blanking unit to linearly move the first blanking unit and the second blanking unit. Furthermore, the above-mentioned stacked core manufacturing device may further include a sensor that detects the position of at least one of the first blanking unit and the second blanking unit.

[0013] According to the present invention, since the number of motors moving the blanking units can be reduced, the manufacturing cost of the stacked core manufacturing device can be reduced, positional errors of the blanking units due to deviations between motors can be reduced, and the problem of excessive motor driving exceeding the movement range of the blanking units can be improved.

[0014] 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 the embodiments of the present invention described below, and among the drawings:

[0015] FIG. 1 is a drawing illustrating a conventional stacked core manufacturing apparatus;

[0016] FIG. 2 is a schematic plan view showing one embodiment of a laminated core manufacturing apparatus according to the present invention;

[0017] FIG. 3 is a cross-sectional view schematically showing a blanking unit of a laminated core manufacturing device illustrated in FIG. 2, a cross-sectional view perpendicular to the direction of movement of the blanking unit;

[0018] FIG. 4 is a longitudinal section orthogonal to FIG. 3; and

[0019] FIGS. 5A and FIGS. 5B are plan views showing a cross-stamping process by the laminated core manufacturing device shown in FIG. 2.

[0020] 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.

[0021] The terms used in this specification are for describing embodiments of the present invention and are not intended to limit the invention. Terms including ordinal numbers, such as "first" and "second," may be used to distinguish between components of the same name when describing them, but do not define or limit the type or number of components.

[0022] 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. Also, the term "connection" is a concept that includes "direct connection" or "indirect connection" through other configurations.

[0023] First, with reference to FIGS. 2 to 4, an embodiment of a stacked core manufacturing apparatus according to the present invention is described.

[0024] One embodiment of the present invention is a laminated core manufacturing apparatus that blanks a strip-shaped material, such as an electrical steel sheet (metal strip), which is conveyed intermittently, to form laminas of a predetermined shape, and integrates the laminas to manufacture a laminated core. More specifically, it receives a metal strip and manufactures a laminated core for rotating machinery such as a motor, a transformer, or an ignition system. The laminated core may be a segmented core that forms a part of a finished core.

[0025] One embodiment of the present invention may be structured as a mold mounted on a press, for example, a progressive die.

[0026] The above-described laminated core manufacturing device includes at least one group of blanking sets having a plurality of blanking units (100) that can change the blanking position in the width direction of the material and are moved by a single motor (M). The lamina is a single thin plate forming an individual layer of the laminated core in a predetermined shape, and while FIG. 2 illustrates a plurality of blanking sets, more specifically two sets (two groups) of blanking sets, it is not limited thereto.

[0027] More specifically, the above-described laminated core manufacturing device comprises a first blanking unit (100a) movable in the width direction of the material (S), a second blanking unit (100b) provided on one side of the first blanking unit so as to be movable in the width direction of the material, and a driving device (200) having a motor (M) that moves the first blanking unit (100a) and the second blanking unit (100b). That is, in this embodiment, the movement path of the first blanking unit (100a) and the movement path of the second blanking unit (100b) are parallel.

[0028] The motor (M) is connected to the first blanking unit (100a) and the second blanking unit (100b) to change the blanking position of the first blanking unit (100a) and the second blanking unit (100b).

[0029] To facilitate the explanation and understanding of the present embodiment, a structure in which two blanking units move together by a single motor is described below, and the motor (M1) that moves the first blanking unit (100a) and the second blanking unit (100b) is referred to as the first motor.

[0030] And, the blanking units (100a, 100b) moved by the first motor (M1) are called the first blanking set (B1), and the blanking units (100c, 100d) moved by the second motor (M2) described later are called the second blanking set (B2), and the blanking units of the second blanking set are called the third blanking unit (100c) and the fourth blanking unit (100d).

[0031] The blanking unit (100) intermittently blanks the material while moving back and forth in the width direction (Y-axis direction) of the material and stacks a lamina of a predetermined shape formed by the blanking. Accordingly, the blanking unit (100) changes the blanking position by moving in a direction (Y-axis direction) perpendicular to the width direction (Y-axis direction) of the material, that is, the transport direction (X-axis direction) of the material.

[0032] The blanking unit (100) comprises a blanking punch (110; Punch) movable in the width direction of the material for changing the blanking position, and a die (120; Die) facing the blanking punch (110).

[0033] The blanking punch (110) is provided in a punch holder (111) and can move up and down in a direction perpendicular to the material (Z-axis direction). When the punch holder (111) moves up and down, more specifically, when it is pressed by the upper holder of the upper die, it moves down toward the material, and thus blanking of the material is achieved.

[0034] Accordingly, the upper die (10) lowers the upper side of the blanking punch (110), more specifically the punch holder (111), by pressing down on the upper side of the punch holder (111).

[0035] The blanking punch (110) is installed through the punch block (112), and the punch block (112) may be equipped with a stripper that separates the blanking punch (110) from the material when the blanking punch (110) rises and presses the material toward the blanking die (121) when the blanking punch (110) descends, and the punch holder (111) and the punch block (112) are interconnected for integrated movement in the Y-axis direction.

[0036] The space between the punch holder (111) and the punch block (112) is elastically supported by an elastic member such as a spring, and the space between the punch block (112) and the die (120) is also elastically supported by an elastic member such as a spring.

[0037] The mechanism of the blanking punch (110) above is known in the art, so further explanation thereof is omitted.

[0038] The blanking punch (110) and the die (120) move together in the width direction of the material simultaneously. The die (120) may include a blanking die (121) and a moving die (122).

[0039] The blanking die (121) has a blanking hole (121a) facing the blanking punch (110), and the shape of the blanking hole (121a) is the same as the bottom shape of the blanking punch (110).

[0040] And, the moving die (122) is movable in the width direction of the material and forms a stacking space (122a) of the laminas that enter through the blanking hole (121a). At this time, the blanking die (121) and the moving die (122) act as a single unit and move simultaneously in the width direction of the material. More specifically, the blanking punch (110), the blanking die (121), and the moving die (122) reciprocate together in the width direction of the material to change the blanking position.

[0041] In this embodiment, the blanking die (121) is fixed to the upper side of the moving die (122), and the moving die (122) is fixed to the moving block (123).

[0042] The above-mentioned moving block (123) is provided to be movable in the width direction (Y-axis direction) on the lower die (20), more specifically, on the lower holder of the lower die. The lower die (20) is provided with a die receiving portion that accommodates the moving die (122) and forms a movement passage for the moving die. Additionally, the lower die (20) may be provided with a guide rail (124) that guides the movement of the moving block (123).

[0043] When the blanking unit (100) punches the material (S) while changing the blanking position in the width direction of the material as described above, the laminas are sequentially stacked inside the moving die (122).

[0044] In this way, the blanking die (121), the moving die (122), and the moving block (123) can be moved as a single unit by the driving device (200). In this embodiment, the die (120) moves linearly by the motor (M), and the die (120) is connected to a linear movement device (300) operated by the motor (M). To precisely control the movement of the blanking units, a servo motor may be used as the motor (M).

[0045] More specifically, the motor (M) is connected to a power transmission device (210) that transmits the power of the motor (M) to a plurality of blanking units (100). The power transmission device (210) is also connected to the linear moving device (300).

[0046] In the present embodiment, the first blanking unit (100a) and the second blanking unit (100b) punch the material (S) while moving in opposite directions, but are not limited thereto, and the first blanking unit (100a) and the second blanking unit (100b) may be configured to punch the material while moving together in the same direction.

[0047] And the motor of the first blanking set, that is, the first motor (M1), is connected to the electric motor (210), and transmits the power of the first motor (M) to the first blanking unit (100a) and the second blanking unit (100b). In this embodiment, the first blanking unit (100a) and the second blanking unit (100b) move in opposite directions by the electric motor (210).

[0048] For example, the above-mentioned transmission device (210) may include a gear transmission device. More specifically, the above-mentioned transmission device (210) may include a first gear (211) that rotates by the power of the motor (M), and a second gear (212) that meshes with the first gear (211) and rotates driven by the first gear (211). The first gear (211) may be directly connected to the shaft of the motor (M), and if the first gear (211) and the second gear (212) are parallel-axis gears with axes parallel to each other, the first gear (211) and the second gear (212) may rotate in opposite directions.

[0049] In this embodiment, the linear moving device (300) is connected to the first gear (211) and the second gear (212), respectively. A ball screw may be used as an example of the linear moving device (300). When a ball screw type linear moving device (300) is connected to the first gear (211) and the second gear (212), and the ball screw is installed on the die (120) of the first blanking unit (100a) and the second blanking unit (100b), the first blanking unit (100a) and the second blanking unit (100b) can move simultaneously in opposite directions by a single motor, namely the first motor (M1).

[0050] Of course, if an idler gear is provided between the first gear (211) and the second gear (212), the first gear and the second gear can rotate in the same direction, and the first blanking unit (and the second blanking unit) can move in the same direction.

[0051] The above-mentioned drive unit may be a belt drive unit, and if the pulley connected to the ball screw of the first blanking unit (first pulley) and the pulley connected to the ball screw of the second blanking unit (second pulley) are connected by cross belting, the first blanking unit (100a) and the second blanking unit (100b) can move simultaneously in opposite directions. And if the first pulley and the second pulley are connected by open belting, the first blanking unit and the second blanking unit can move in the same direction.

[0052] The laminated core manufacturing device according to the present embodiment may further include the second blanking set (B2), and the blanking units (100) of the second blanking set, for example, the third blanking unit (100c) and the fourth blanking unit (100d), may also move together in opposite or same directions by a separate electric motor (200) that includes a single motor, namely the second motor (M2). Since the electric motor (210) of the first blanking set (B1) described above can be used as the electric motor of the second blanking set, a repeated description is omitted.

[0053] As shown in the examples of FIG. 5a and FIG. 5, the blanking units (100) can sequentially form and stack the laminas by punching the material (S) while changing the blanking position in the width direction of the material (S). The laminas sequentially stacked in the internal space of the die (120) (stacking space of the moving die; 122a) can be integrated by a known tab fixing method or adhesive fixing method to form a stacked core, and the perpendicularity and parallelism of the stacked core can be improved despite the thickness variation in the width direction of the material.

[0054] Although not illustrated, the above die may be equipped with a configuration such as a squeeze mechanism or a pinch mechanism for aligning and straight-line passage of the laminas, and when interlayer bonding of the laminas is achieved by an embossing (interlock tab), the above laminated core manufacturing device may be equipped with an embossing punch for embossing processing and a punch for forming a counter hole.

[0055] In this embodiment, the lamina (first lamina) formed by the first blanking unit (100a) has a shape obtained by rotating the lamina (second lamina) formed by the second blanking unit (100b) by 180°. Also, in the second blanking set (B2), the lamina (third lamina) formed by the third blanking unit (100c) has a shape obtained by rotating the lamina (fourth lamina) formed by the fourth blanking unit (100d) by 180°.

[0056] Referring to FIGS. 5a and 5b, the positions of the blanking units can be controlled so that the blanking areas of the first blanking unit (100a), the second blanking unit (100b), the third blanking unit (100c), and the fourth blanking unit (100d) do not overlap. In this embodiment, at the same blanking timing, the first blanking unit (100a), the second blanking unit (100b), the third blanking unit (100c), and the fourth blanking unit (100d) punch the material at different positions in the Y-axis direction.

[0057] For example, as illustrated in FIGS. 5a and 5b, the first blanking unit (100a) and the third blanking unit (100c) sequentially blank the material while moving back and forth between line A and line B. Then, the second blanking unit (100b) and the fourth blanking unit (100d) can blank the material while moving back and forth between line C and line D.

[0058] As described above, the blanking units (100a, 100b, 100c, 100d) can change the blanking position by shifting in the width direction of the material, thereby eliminating thickness variation of the laminated core and improving perpendicularity and parallelism.

[0059] The above-described stacked core manufacturing device may further include a sensor (400) that detects the position of at least one of the first blanking unit and the second blanking unit. Additionally, the second blanking set may also be equipped with a sensor (400) that detects the position of at least one of the third blanking unit and the fourth blanking unit. In other words, at least one sensor (400) may be provided for each blanking set of the stacked core manufacturing device.

[0060] When the sensor (400) of the first blanking set is referred to as the first sensor, the first sensor may detect the position of the first blanking unit (100a) and the position of the second blanking unit (100b). Of course, the positions of the first blanking unit (100a) and the second blanking unit (100b) may each be detected by separate sensors.

[0061] The sensor (400) may include a sensing part (410) that is fixed to the lower die (20), for example, a lower holder, and maintained at a certain position, and a detection part (420) that is fixed to the moving die (122) of the die, for example, a first blanking unit or a second blanking unit, and moves together with the moving die (122).

[0062] An example of the sensor (400) above may be a light sensor (optical sensor), and the detection unit (410) may include a light emitting unit and a light receiving unit, and the detection unit (420) may include a plurality of blocking units (421, 422) that block the space between the light emitting unit and the light receiving unit. Of course, the type of sensor above is not limited to a light sensor, and for example, a contact sensor may be used. Since various types of sensors are known, additional description of the sensor itself is omitted.

[0063] The above detection unit (420) may include a pair of blocking units formed spaced apart in the Y-axis direction, and in this embodiment, the blocking units (421, 422) are designed to be detected by the detection unit (410) so that the moving die moves excessively.

[0064] For example, if the blocking part (421, 422) of the detection part (420) is positioned between the light-emitting part and the light-receiving part and is detected by the detection part (410), the control unit of the stacked core manufacturing device determines that the position of the moving die has deviated from a preset range, and can stop the operation of the motor (M) to prevent excessive driving of the motor, and can also stop the entire operation of the stacked core manufacturing device. Since various types of sensors for detecting the position of the moving die are known, additional explanation regarding the sensor itself is omitted.

[0065] As described above, this embodiment can reduce the number of motors, more specifically servo motors, and can improve the over-driving of the motors.

[0066] 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 its spirit or scope.

[0067] 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.

[0068] The present invention can be used for manufacturing a laminated core, and according to the present invention, a plurality of blanking units that move simultaneously by a single motor can be applied to a progressive mold.

Claims

1. A laminated core manufacturing device for manufacturing a laminated core by blanking a strip-shaped material that is conveyed intermittently: A first blanking unit movable in the width direction of the above material; A second blanking unit provided on one side of the first blanking unit so as to be movable in the width direction of the material; and A stacked core manufacturing apparatus comprising: a driving device having a motor connected to the first blanking unit and the second blanking unit to change the blanking position of the first blanking unit and the second blanking unit.

2. In Paragraph 1, The above-mentioned first blanking unit and second blanking unit are a stacked core manufacturing device that moves in opposite directions.

3. In Paragraph 1, The above-described driving device is a stacked core manufacturing device further comprising an electric motor connected to the motor.

4. In Paragraph 3, The above-mentioned transmission device is a stacked core manufacturing device comprising a gear transmission device that rotates by the above-mentioned motor.

5. In Paragraph 4, A stacked core manufacturing device in which a ball screw driven by the electric motor is installed in the first blanking unit and the second blanking unit to linearly move the first blanking unit and the second blanking unit.

6. In Paragraph 3, A stacked core manufacturing device in which a ball screw driven by the electric motor is installed in the first blanking unit and the second blanking unit to linearly move the first blanking unit and the second blanking unit.

7. In any one of paragraphs 1 through 6, A stacked core manufacturing apparatus further comprising a sensor for detecting the position of at least one of the first blanking unit and the second blanking unit.

8. A laminated core manufacturing apparatus for manufacturing a laminated core by blanking a strip-shaped material that is conveyed intermittently: Motor and, A laminated core manufacturing apparatus comprising at least one group of blanking sets having a plurality of blanking units that move in the width direction of the material by the above motor

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