Apparatus and method for manufacturing laminated core

Abstract

An apparatus and a method for manufacturing a laminated core are disclosed. The apparatus for manufacturing a laminated core comprises: a blanking punch provided on an upper die that can be lifted and lowered to sequentially form laminae by punching intermittently transferred strips; a stacking die having a die hole facing the punch so that the laminae are stacked, the staking die being rotatably provided on a lower die facing the upper die; a punch switch provided on the upper die to selectively switch the mode of the punch to an idle mode; and a sensor provided on the upper die to detect the mode of the punch. According to the present invention, the rotation error of the stacking die in which the laminae are stacked and coupled can be precisely monitored and managed, so that immediate measures can be taken in the event of the rotation error of the staking die, thereby enabling the stable operation of the apparatus for manufacturing a laminated core and improving productivity and yield.

Description

Laminated core manufacturing device and manufacturing method

[0001] The present invention relates to a device and method used in manufacturing a laminated core, and more particularly, to a device and method for manufacturing a laminated core capable of responding to rotational errors of a laminated die in which lamination and bonding of laminae are performed.

[0002] In general, a core is provided inside a rotating device such as a motor or a generator, and recently, a laminated core manufactured by a progressive die is being used as a core of a rotating device such as a rotor core and a stator core, or as a core of various devices such as a transformer or an ignition system.

[0003] When the laminae sequentially formed by the progressive mold are stacked and combined within the mold, the laminated core can be manufactured, and the laminae forming the laminated core are combined in various ways to form the laminated core.

[0004] Examples of the above-mentioned laminated core manufacturing method include a tab fixing method using an interlock tab, i.e., an embossed projection (embossed projection), a welding fixing method using welding, e.g., laser welding, and a rivet fixing method.

[0005] In order to manufacture the laminated core using the above tab fixing method, the embossing protrusion (also called an interlock tab or a caulking protrusion) is formed on the lamina, and an example of manufacturing the laminated core using the tab fixing method is disclosed in Patent Registration No. 10-1881257, etc.

[0006] Another example of the above-mentioned method for manufacturing a laminated core is a technology for bonding the interfaces of the laminae with an adhesive, i.e., an adhesive fixation method. For example, an example of manufacturing an adhesive-type laminated core by applying an adhesive to the surface of a strip and then punching the strip in a laminated core manufacturing device is disclosed in Patent No. 10-1566491, etc. In addition, an example of manufacturing an adhesive-type laminated core using a strip pre-coated with an adhesive is disclosed in Patent No. 10-2691827, etc.

[0007] Fig. 1 is a drawing showing an example of a laminae and a laminated core, in which a plurality of laminae (L) are combined to form a laminated core (C). Of course, the shape of the laminae is not limited to the example of Fig. 1 and may vary.

[0008] The above-described laminae are formed by a blanking process and are stacked vertically within a stacking die of a progressive mold, and a plurality of laminae are joined within the stacking die by embossing projections or adhesive to form the stacked core.

[0009] Meanwhile, in order to manage the perpendicularity, parallelism, and thickness deviation of the laminated core, the laminated core manufacturing device may be equipped with a laminated die that rotates at a preset angle at predetermined timings, for example, an index rotation.

[0010] The above-mentioned rotational lamination technology of the laminated die, for example, the index rotation or skew lamination technology itself, is a known technology, and an adhesive laminated core manufacturing device in which the laminae are index-rotated by the laminated die is disclosed in Patent No. 10-1990291, etc., and an invention related to skew lamination is disclosed in Patent No. 10-1507104, etc.

[0011] It is important that the above-mentioned laminated die rotates accurately at a preset angle, and any rotation error of the above-mentioned laminated die may affect the quality of the laminated core.

[0012] The purpose of the present invention is to provide a laminated core manufacturing device and a laminated core manufacturing method capable of detecting a rotation error of a laminated die in which lamination and bonding of laminae are performed and stably monitoring and managing a blanking process, i.e., a process of forming laminae.

[0013] One aspect of the present invention provides a laminated core manufacturing device comprising: a blanking punch provided on an upper die that is capable of being lifted to sequentially form laminae by punching out intermittently conveyed strips; a laminating die having a die hole facing the punch so that the laminae are laminated, the laminae being rotatably provided on a lower die facing the upper die; a punch switch provided on the upper die to selectively switch the mode of the punch to an idle mode; and a sensor provided on the upper die to detect the mode of the punch.

[0014] The sensor can detect the movement of the punch switch to detect the mode of the punch. The punch switch can include a cam mechanism provided on the mold.

[0015] The punch switch includes a punch lever movably provided on the upper part to switch the punch to the idle mode, and a driving unit for moving the punch lever; the sensor may detect the mode of the punch by detecting movement of the punch lever.

[0016] The punch lever may optionally form clearance on the upper side of the punch to switch the punch to the idle mode.

[0017] And the punch lever may have a sensor hole facing the sensor.

[0018] The punch switch may further include a push pin connected to the punch lever to shift the punch lever in order to switch the punch to the idle mode when there is a rotation error of the stacked die.

[0019] A pin groove may be formed on the upper surface of the laminated die so as to be positioned coaxially with the push pin during normal rotation of the laminated die.

[0020] Another aspect of the present invention provides a method for manufacturing a laminated core, comprising: (a) a step of punching an intermittently conveyed strip with a blanking punch of a progressive mold and injecting a lamina into a rotatable laminated die; and (b) a step of switching the punch to idle mode to prevent blanking in the progressive mold in the event of a rotation error of the laminated die.

[0021] In case of a rotation error of the above-mentioned laminated die, the step (c) may further include performing at least one of a step of sounding an alarm and a step of stopping the operation of the progressive mold simultaneously with or after the step (b).

[0022] According to the present invention, since the rotation error of the stacking die in which lamination and bonding of laminae are performed can be precisely monitored and managed, defects in the stacking core and decrease in productivity can be reduced, the normal operation of the sensor can be checked regularly / irregularly to perform maintenance / repair of the stacking core manufacturing device, and when a rotation error of the stacking die occurs, the stable operation of the stacking core manufacturing device can be achieved by taking immediate action, and productivity and yield can be improved, and a fool proof system can be constructed.

[0023] The features and advantages of the present invention may be better understood by reference to the following detailed description of embodiments of the present invention, together with the drawings, of which:

[0024] Fig. 1 is a perspective view showing an example of a laminar and a laminated core;

[0025] FIG. 2 is a schematic drawing showing one embodiment of a laminated core manufacturing device according to the present invention;

[0026] FIG. 3 is a schematic drawing showing another embodiment of a laminated core manufacturing device according to the present invention;

[0027] FIG. 4 is a drawing showing one embodiment of a punch converter applicable to the laminated core manufacturing device illustrated in FIGS. 2 and 3;

[0028] Fig. 5 is an enlarged view of part “A” of Fig. 4;

[0029] FIG. 6 is a drawing illustrating a state in which the laminated die of the laminated core manufacturing device illustrated in FIGS. 2 and 3 is in normal rotation and an abnormal rotation state (rotation error);

[0030] Figure 7 is a drawing showing the state of the punch converter when the laminated die of the laminated core manufacturing device rotates normally; and

[0031] FIG. 8 is a drawing showing a blanking punch switched to idle mode by the punch switch shown in FIG. 4;

[0032] Hereinafter, preferred embodiments of the present invention, which can specifically realize the objectives of the present invention, will be described with reference to the attached drawings. In describing these embodiments, the same names and symbols will be used for identical components, and additional descriptions thereof will be omitted below.

[0033] The terms used in this specification are used to describe embodiments of the present invention and are not intended to limit the present 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 number of components.

[0034] And when it is said that a component is "connected" to another component, it should be understood that this may involve a direct connection, but also an indirect connection through an intermediary.

[0035] In this specification, terms such as “include” or “have” mean that a feature, number, step, operation, component, part or combination thereof described in the specification exists, and should be understood to not exclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0036] The present invention can be applied to the manufacture of laminated cores using various methods, such as adhesive fixation or tab fixation using embossing projections. Embodiments of the laminated core manufacturing apparatus according to the present invention sequentially form laminas (L) through a blanking process and combine the laminas to manufacture a laminated core (C).

[0037] Referring to FIGS. 2 to 4, the laminated core manufacturing device includes a blanking punch (100), a rotatable laminated die (200), and a punch changer (300) for changing the state of the blanking punch, i.e., the mode of the punch. In addition, a back pressure unit (400) may be provided below the laminated die (200) so as to be able to be elevated.

[0038] The above punch, i.e., blanking punch (100), is provided on a movable upper mold (10) and sequentially forms the laminae (L) by striking a strip (S) that is intermittently conveyed. In other words, the blanking punch (100) is elevated to sequentially form the laminae (L) through a blanking process.

[0039] And the laminated die (200) is provided on the lower side of the blanking punch (100), and the laminae formed by the blanking process are sequentially introduced into the interior of the laminated die and laminated. In the laminated die (200), the laminae are combined and the laminated cores (C) are sequentially manufactured.

[0040] The above-mentioned stacking die (200) is a hollow type that is vertically penetrated so that the laminae (L) are pushed through. In other words, a die hole (201) facing the blanking punch (100), i.e., a hollow portion having a vertical penetration structure, is formed in the stacking die (200) so that the laminae are stacked, and when the laminae are combined in the die hole, the stacking core (C) can be formed.

[0041] The above-mentioned laminated die (200) is provided on the lower die (20) facing the upper die (10), and the back pressure unit (400) supports the laminated core (C) discharged from the above-mentioned laminated die (200).

[0042] Since the above-mentioned back pressure unit (400) is a known configuration in a progressive mold type laminated core manufacturing device, additional description thereof is omitted.

[0043] Embodiments of a laminated core manufacturing device according to the present invention may include a progressive die, i.e., a sequential feeding press device, having the blanking punch (100) and the laminated die (200). FIG. 2 shows an example of a progressive die for manufacturing a laminated core by a tab fixing method using an embossing projection, and FIG. 3 shows an example of a progressive die for manufacturing a laminated core by an adhesive fixing method.

[0044] The blanking punch (100) is raised and lowered together with the upper die (10), and the upper die (10) is provided so as to be raised and lowered on the upper side of the lower die (20). In order to process the strip (S) intermittently transported between the upper die (10) and the lower die (20), the upper die (10) may be further provided with at least one other punch together with the blanking punch (100).

[0045] To explain more specifically, in order to process the strip (S) passing between the upper mold (10) and the lower mold (20), various punches for implementing the shape of the laminated core, such as a slot punch (111a) or a shaft hole punch (111b), in addition to the blanking punch (100), may be added to the upper mold (10).

[0046] The above slot punch (111a) can form a hole, slot, groove, etc. around the center of the laminated core, and the above shaft hole punch (111b) can be a punch that forms a center hole, for example, an axial hole, of the laminated core.

[0047] And, in the laminated core manufacturing device that joins the laminae (L) by the tab fixing method, an embossing punch (111c) and a piercing punch (111d) may be provided as in the example shown in Fig. 2. The embossing punch (111c) is a punch that forms an embossing projection on the strip for the tab fixing method. And, the piercing punch (111d) is a punch (counter punch) that forms a fastening hole (counter hole) into which the embossing projection is fitted when the laminae are overlapped, and is formed in the laminae that finishes one surface of the laminated core, and implements separation between the laminated cores (C) that are sequentially discharged from the laminated die.

[0048] In the case of a laminated core manufacturing device that bonds laminas using an adhesive fixing method, as illustrated in Fig. 3, the embossing punch and the piercing punch may be omitted, and a tool for applying adhesive to the strip, i.e., an adhesive applicator (120), may be included. Of course, when manufacturing a laminated core using a steel plate having an adhesive coating layer formed on the surface, a strip called a so-called SB steel plate, the adhesive applicator may be omitted.

[0049] And the above-mentioned lower die (20) is provided with forming dies (112a, 112b, 112c, 112d) corresponding to the punches. The positions of the tools for processing the strip in the preceding step of the blanking punch are not limited to the examples of FIGS. 2 and 3 and may be varied in various ways.

[0050] The upper mold (10) may include a punch plate, a punch back plate, and an upper holder, and the lower mold (20) may include a die plate, a die back plate, and a lower holder, and it is known in the art that the lower holder may be supported by a holder support, for example, a sub bolster.

[0051] As described above, the above-described laminated die (200) has a hollow shape, and a die (210), i.e., a blanking die, is provided on the upper portion of the laminated die to face the blanking punch (100) for a blanking process. Therefore, each time the metal strip (S) is blanked, the laminas (L) inside the laminated die (200) are pushed and move downward by the thickness of the metal strip (S).

[0052] In order to manufacture a laminated core using an adhesive fixing method, the laminated die (200) may include a heater (220), such as a high-frequency induction heater or an electric heater, for thermally curing the adhesive between the laminae. Of course, if the laminae are bonded using a room-temperature curing adhesive, for example, a two-component adhesive, the heater (220) may be omitted.

[0053] And, a guide mechanism may be provided below the blanking die (210) to align the laminae (L). An example of the guide mechanism is a squeeze mechanism (230; Squeezer), and the squeeze mechanism (230) aligns the laminae (L) coaxially below the blanking die. A ring-shaped squeeze mechanism is also called a squeeze ring.

[0054] A guide mechanism called a pinch mechanism (230; Pincher) may be further provided in the lower region of the above-mentioned stacked die (240). The pinch mechanism (240) is configured to pass the stacked core (C) through the lower section of the above-mentioned stacked die (200), and is provided on the lower side of the squeeze mechanism (230).

[0055] And, between the squeeze mechanism (230) and the pinch mechanism (240), an internal guide (250), for example, a ring-shaped guide, may be provided to guide the movement of the laminae (L).

[0056] In the present embodiment, the heater (220) is provided in the area between the squeeze mechanism (230) and the pinch mechanism (240), and the internal guide (250) may have a cylindrical shape that penetrates in the vertical direction and guides the movement of the laminae inside the heater (220).

[0057] Since the above heater, squeeze mechanism, pinch mechanism and internal guide are known components in the art, further description thereof is omitted.

[0058] And the above-mentioned stacked die (200) is a rotatable configuration, and can be index-rotated at a predetermined angle, for example, 60°, by a belt transmission device or gear transmission device that transmits power from a prime mover (510) such as a rotational transmission device (500), for example, a servo motor. Of course, the rotation angle of the above-mentioned stacked die can be set to various degrees, such as 45°, 90°, or 180°.

[0059] In this embodiment, the laminated die (200) is rotatably mounted on the lower die (20). Laminae (L) formed by the blanking punch (100) are sequentially introduced into the die hole (201) of the laminated die, i.e., the hollow portion, and laminated, and a laminated core (C) is formed by the combination of the laminae inside the laminated die (200).

[0060] The above lower die (20) is provided with a die support (21) that rotatably supports the laminated die (200), and the die support (21) is also called a bush. A bearing (30) is provided on the die support (21) for rotation of the laminated die. Drawing reference numeral 11 denotes a stripper, and drawing reference numeral 12 denotes a spring.

[0061] Referring to FIGS. 4 to 8, the punch converter (300) can switch the mode of the blanking punch to an idle mode. In other words, the punch converter (300) can switch the blanking punch from a blanking-capable state (blanking mode) to an idle state, i.e., a blanking-incapable state (non-punching state), and the punch (100) switched to the idle mode does not perform the blanking process even if the upper die (10) is lowered. And when the upper die (10) is lowered in the blanking mode, the blanking punch punches the strip to perform the blanking process.

[0062] In the present embodiment, the punch converter (300) is provided in the upper die (10) and can optionally switch the blanking punch (100) to an idle mode. More specifically, the punch converter (300) switches the blanking punch (100) to an idle state, i.e., a blanking-incapable state, when a rotation error occurs in the laminated die (200). At this time, even if the upper die (10) is lowered to the lower limit, processing of the strip by the blanking punch (100), i.e., blanking, is prevented, and thus, formation of a new lamina is also stopped.

[0063] And the present embodiment further includes a sensor (600) configured to detect the state, i.e., the mode, of the blanking punch (100). In the present embodiment, the sensor (600) is provided in the mold (10) and is configured to detect the mode switching of the blanking punch (100), for example, whether the blanking punch (100) has been switched to the idle mode.

[0064] The above sensor (600) may detect the relative movement of the blanking punch (100) with respect to the above-mentioned mold (10), i.e., a change in height, but in this embodiment, it detects the movement of the punch switch (300), i.e., a movement.

[0065] The punch converter (300) may include a cam mechanism (310). In the present embodiment, the cam mechanism is provided on the upper mold (10), pressurizes the blanking punch to fix it at a predetermined position of the upper mold, i.e., a blanking position, and selectively allows a change in the height of the punch for idle mode.

[0066] For example, the cam mechanism (310) may include a cylindrical structure of a direct cam as in the embodiment described below.

[0067] More specifically, the punch switch (300) may include a punch lever (311) movably provided on the upper part (10), and a driving unit (320) that moves the punch lever (311).

[0068] The punch lever (311) can switch the blanking punch (100) to idle mode, and the blanking punch (100) can be switched to idle mode by movement of the punch lever (311). In addition, the sensor (600) detects movement of the punch lever (311).

[0069] In the present embodiment, the punch lever (311) is provided to be linearly movable on the upper mold (10). In addition, the driving unit (320) may include a device capable of linearly moving the punch lever (311), for example, an actuator such as a cylinder, and the type of the driving unit is not limited to a cylinder. The driving unit (320) may move the punch lever (311) to switch the blanking punch (100) from idle mode to blanking mode.

[0070] The punch lever (311) can perform a linear reciprocating motion in the upper die (10), and the mode of the blanking punch can be determined depending on the position of the punch lever (311). As in the example shown in Fig. 4, when the punch lever (311) is in the first position (blanking position), the blanking punch (100) can perform the blanking mode, and when the upper die (10) is lowered while the stacking die (200) is in normal rotation, blanking is performed as in the example of Fig. 7.

[0071] Conversely, as in the example shown in Fig. 8, when the punch lever (311) moves to the second position (idle position), the blanking punch (100) is switched to idle mode.

[0072] In this embodiment, the punch lever (311) can selectively form clearance (301) on the upper side of the blanking punch (100) to switch the blanking punch (100) to idle mode, that is, to allow the punch to rise.

[0073] That is, as in (a) of Fig. 5, when the punch lever (311) is in the first position, the clearance is removed so that the blanking punch (100) is fixed at the blanking position of the upper mold. And, when the clearance (301) is formed on the upper side of the blanking punch as in (b) of Fig. 5 by the movement of the punch lever (311), the fixing force for the blanking punch (100) is released so that the striking force of the blanking punch is lost.

[0074] In order to selectively form the above-mentioned clearance (301) on the upper side of the blanking punch, the punch lever (311) may have a cam surface (312) having at least one step.

[0075] In the present embodiment, the cam surface (312) is formed on the lower surface of the punch lever and is a sawtooth-shaped stepped portion with multiple repeated steps. However, the number of steps is not limited, and for example, a single step may be provided on the punch lever, taking into account the punch striking force, the size of the punch, the movement distance of the punch lever, etc.

[0076] In addition, a counter body (330) facing the punch lever (311) may be provided on the upper portion of the blanking punch (100), and the counter body (330) may be referred to as a slide cam. The blanking punch and the counter body may be manufactured as one piece.

[0077] In this embodiment, the counter body (330) has a sawtooth slide surface (331) that can engage with the sawtooth cam surface (312). The slide surface (331) is formed on the upper surface of the counter body (330).

[0078] Therefore, if the sawtooth cam surface (312) and the sawtooth slide surface (331) are misaligned as in (a) of Fig. 5, the blanking punch (100) can be restrained and fixed at the punching position, and the blanking process can proceed when the upper die is raised and lowered. Conversely, if the sawtooth cam surface (312) and the sawtooth slide surface (331) are in a position where they can engage (align) as in (b) of Fig. 5, the blanking punch (100) can be switched to idle mode.

[0079] Of course, an elastic member such as a spring is provided in the above-mentioned upper mold (10) to lift the blanking punch (100) upwards, so that the blanking punch (100) can be lifted upwards within the above-mentioned upper mold (10) when the cam surface and the slide surface are in a position where they can be engaged (aligned).

[0080] The above punch lever (311) may have a sensor hole (313) facing the sensor (600).

[0081] The above sensor (600) can detect a change in the position of the sensor hole (313) to thereby detect a mode change of the blanking punch. In the present embodiment, the sensor and the sensor hole are arranged in a straight line in the blanking mode, and the sensor and the sensor hole are misaligned in the idle mode, but the opposite is also possible.

[0082] The punch lever (311) may include a first lever (311a) having the cam surface (312), and a second lever (311b) that is linked to the first lever (311a) and connected to the driving unit (320).

[0083] When the driving unit (320) pushes the second lever (311b), the second lever (311b) moves the first lever (311a) to the first position. However, the punch lever (311) may not include multiple levers but may be formed as a single, integrated lever.

[0084] And in the present embodiment, the sensor hole (313) is formed in the second lever (311b), but may also be formed in the first lever (311a). It goes without saying that the position of the sensor hole (313) may change depending on the position of the sensor (600).

[0085] And the punch switch (300) may further include a push pin (340) for switching the blanking punch (100) to the idle state when there is a rotation error of the stacked die (200). The push pin (340) is configured to be connected to the punch lever (311) and shift the punch lever (311).

[0086] The above push pin (340) is provided on the above upper part (10) and moves up and down together with the above upper part (10).

[0087] A pin groove (202) is formed on the upper surface of the stacked die (200) so that a push pin (340) that descends together with the upper die (10) is inserted during normal rotation of the stacked die (200).

[0088] The above push pin (340) is also called an index pilot pin and is provided on the upper part (10) so as to be able to move up and down in place together with the upper part (10) and to be able to move up and down with respect to the upper part (10).

[0089] For example, as in the example shown in FIG. 6, when pin grooves (202) are formed at 60° intervals on the upper surface of the laminated die and the laminated die (200) is set to rotate 60° per blanking, if a rotation error occurs due to abnormal rotation outside the set angle as in the example of (b) of FIG. 5, the push pin (340) and the pin groove (202) are misaligned as in FIG. 8, so that an upward reaction force is applied to the push pin (340), and the push pin (340) rises to move the punch lever (311) to the second position.

[0090] In this embodiment, the push pin (340) has a protruding jaw (341) that pushes the punch lever (311) to the second position, and the push pin (340) penetrates the punch lever (311).

[0091] A guide hole (311c) is formed in the punch lever (311) so that the push pin (340) passes through it. When the punch lever is in the first position, the guide hole (311c) is located above the protruding jaw (341), and when the protruding jaw (341) rises and pushes the guide hole (311c), the punch lever (311) moves to the second position.

[0092] In order to make the movement of the push pin (340) smoother while alleviating the impact applied to the punch lever (311) when the push pin (340) rises, the step surface (342) of the protruding jaw (341) may be formed to be inclined, and the inner surface of the guide hole (311c) that comes into contact with the step surface (342) may also be formed to be inclined.

[0093] And the above-mentioned shape (10) may be provided with an elastic member (350), for example, a spring, that elastically supports the push pin (340) downward, and the push pin (340) may be pushed downward by the elastic member (350) and returned to its original position.

[0094] If the blanking punch (100) is switched to idle mode due to a rotation error of the stacking die (200) during the operation of the above-mentioned mold (10), unlike other processes such as center hole processing and slot processing that continue to be performed by the elevation of the above-mentioned mold (10), the blanking process does not proceed, resulting in process defects such as loss of strip.

[0095] And in the case of a mold equipped with a heater (220) for curing adhesive in a laminated die (200), when the blanking punch is switched to idle mode, the laminas inside the laminated die may remain in place and be overheated and expanded by the heater (220), which may cause damage (breakage) to parts constituting the laminated die, for example, the internal guide described above, and may cause damage and deterioration of the precision of the laminated die.

[0096] In this embodiment, when there is a rotation error of the laminated die (200), an alarm may be provided by a control unit that controls the operation of the mold or the operation of the laminated core manufacturing device may be stopped.

[0097] Accordingly, when the above-described alarm sounds, the operator can manually stop the mold or the mold can be automatically stopped by the control unit, and damage caused by rotation errors of the stacking die can be minimized.

[0098] After the rotation error of the laminated die is corrected, the punch lever can be moved by the driving unit, and the blanking punch can be switched to blanking mode. In addition, the operator can check whether the sensor is operating normally before starting the mold operation or periodically / irregularly.

[0099] Another embodiment of the present invention can provide a method for manufacturing a laminated core, including a step of punching an intermittently conveyed strip with a blanking punch of a progressive mold and injecting a lamina into a rotatable laminated die (blanking step), and a step of switching the blanking punch to idle mode to prevent blanking in the progressive mold in the event of a rotation error of the laminated die (punch switching step).

[0100] In the event of a rotation error of the above-mentioned laminated die, at least one of a step of sounding an alarm and a step of stopping the operation of the progressive mold may be performed simultaneously with or after the punch switching step.

[0101] As described above, preferred embodiments of the present invention have been described, and it is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope thereof, in addition to the embodiments described above.

[0102] Therefore, the above-described embodiments should be considered as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description but may be modified within the scope of the appended claims and their equivalents.

[0103] The present invention can be used in the manufacture of laminated cores, and according to the present invention, the rotation error of a laminated die in which lamination and bonding of laminae are performed can be precisely monitored and managed.

Claims

1. A blanking punch provided on a movable upper mold to sequentially form laminae by punching out intermittently conveyed strips; A laminating die having a die hole facing the punch so that the above laminae are laminated, and being rotatably provided on a lower die facing the upper die; A punch switch provided on the above-described figure to optionally switch the mode of the punch to idle mode; and A laminated core manufacturing device including a sensor provided on the upper mold to detect the mode of the punch.

2. In paragraph 1, The above sensor is a laminated core manufacturing device that detects the movement of the punch converter.

3. In paragraph 1 or 2, The above punch converter is a laminated core manufacturing device including a cam mechanism provided on the above mold.

4. In paragraph 1 or 2, The punch switch includes a punch lever movably provided on the upper mold to switch the punch to the idle mode, and a driving unit for moving the punch lever; and the sensor is a laminated core manufacturing device that detects movement of the punch lever.

5. In paragraph 4, The punch lever is a laminated core manufacturing device that selectively forms clearance on the upper side of the punch to switch the punch to the idle mode.

6. In paragraph 4, The above punch lever is a laminated core manufacturing device having a sensor hole facing the sensor.

7. In paragraph 4, The punch switch is a laminated core manufacturing device further comprising a push pin connected to the punch lever to shift the punch lever in order to switch the punch to the idle mode in case of a rotation error of the laminated die.

8. In paragraph 7, A laminated core manufacturing device in which a pin groove is formed on the upper surface of the laminated die so as to be positioned coaxially with the push pin during normal rotation of the laminated die.

9. (a) step of punching out the intermittently conveyed strip with a blanking punch of a progressive mold and inserting the lamina into the inside of a rotatable laminate die; and A method for manufacturing a laminated core, comprising a step (b) of switching the punch to idle mode to prevent blanking in the progressive mold when there is a rotation error of the laminated die.

10. In paragraph 9, A method for manufacturing a laminated core, further comprising a step (c) of performing at least one of a step of sounding an alarm and a step of stopping the operation of the progressive mold simultaneously with or after the step (b) in case of a rotation error of the laminated die.

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