Laminated core manufacturing apparatus and adhesive applicator for manufacturing laminated core

Abstract

Disclosed are a laminated core manufacturing apparatus and an adhesive applicator for manufacturing a laminated core. The adhesive applicator comprises: a body having a plurality of first holes which form a flow path for an adhesive; a cover having a plurality of second holes communicating with the first holes to discharge the adhesive to the outside, fixed to one side of the body, and covering one side surface of the body; and plugs which are accommodated in the first holes so as to be movable along the axial line of the first holes so as to open and close the second holes, and which come into surface contact with the inner surface of the cover facing one side surface of the body in parallel to block the second holes. The inner surface of the cover is selectively in surface contact with the plug and forms a plug blocking surface perpendicular to the axial line of the first holes. According to the present invention, the adhesive applicator can be easily processed, the precision of adhesive nozzles can be improved, the heights of the adhesive nozzles can be easily regulated and processed, the time required for assembling or washing the adhesive nozzles can be shortened, the amount of adhesive applied can be precisely managed, and the number of parts and manufacturing costs of the adhesive nozzles can be reduced.

Description

Laminated core manufacturing device and adhesive applicator for laminated core manufacturing

[0001] The present invention relates to a laminated core manufacturing device and an adhesive applicator for manufacturing the laminated core, and more particularly, to a laminated core manufacturing device that applies an adhesive to a belt-shaped material that is intermittently transported to manufacture the laminated core by bonding laminas with an adhesive, and an adhesive applicator for manufacturing the laminated core for the same.

[0002] In general, a laminated core refers to a core having a laminated structure manufactured by integrating multiple laminae, for example, a core structure in which multiple laminae obtained by punching a metal strip are integrated into a laminated structure.

[0003] The above laminated core is used as a core of various devices such as rotating machines such as motors, transformers, or ignition systems, and various methods for manufacturing the above laminated core are known.

[0004] As a representative method, the above-described laminated core can be manufactured by forming laminas of a predetermined shape using a progressive mold and bonding the laminas in multiple sheets.

[0005] Known methods for combining and integrating the above laminae include a tab fixing method using an interlock tab, a welding fixing method using welding, for example, laser welding, and a rivet fixing method.

[0006] An example of the above tab fixing method is disclosed in Korean Patent Publication No. 10-2008-0067426, etc., but has an iron loss problem and has limitations in embossing processing for forming an interlock tab as the material, i.e., the steel plate, is thinned.

[0007] Recently, technologies for bonding laminae using adhesive bonding (adhesive bonding) have been developed and used. For example, Korean Patent No. 10-1566491 discloses an invention that applies an adhesive to the surface of a metal strip supplied to a progressive mold and then punches out the metal strip to produce a laminated core using adhesive bonding.

[0008] Figure 1 is a drawing showing an example of a laminae and a laminated core, in which a plurality of laminae (L) are laminated and bonded in the various ways described above to form a laminated core (C).

[0009] In order to manufacture the above-described laminated core by adhesive method, adhesive is applied in the form of dots at multiple points at each lamina formation site on the metal strip, and if the interface adhesion of the laminas is not evenly and uniformly achieved, the interface of the laminas may crack, and problems such as a deterioration in the performance and quality of the laminated core may occur.

[0010] And in order for adhesive to be applied to multiple points at each of the aforementioned lamina formation areas, a corresponding number of adhesive nozzles are required. The more adhesive application points there are, the more time it takes to classify and assemble the adhesive nozzle parts. In addition, due to the height difference between the adhesive nozzles, it is difficult to precisely manage the amount of adhesive applied, and the adhesive nozzles are easily damaged.

[0011] The purpose of the present invention is to provide an adhesive applicator for manufacturing a laminated core, which can precisely apply an adhesive to the surface of a material and facilitates dimensional control and processing, and a laminated core manufacturing device having the same, in order to manufacture a laminated core by an adhesive method.

[0012] One aspect of the present invention provides an adhesive applicator for manufacturing a laminated core, which applies an adhesive to a material that is intermittently conveyed to bond interfaces of laminae formed by blanking. The adhesive applicator includes: a body having a plurality of first holes forming a flow path of the adhesive; a cover having a plurality of second holes communicating with the first holes to discharge the adhesive to the outside, the cover being fixed to one side of the body and covering the one side of the body; and plugs that are movably accommodated along the axes of the first holes within the first holes to open and close the second holes, and that are in surface contact with an inner surface of the cover that faces parallel to the one side of the body to block the second holes. The inner surface of the cover forms a plug blocking surface that selectively makes surface contact with the plug and is orthogonal to the axes of the first holes.

[0013] The body and one side surface and the inner side surface of the cover are in surface contact; the interface of the body and the cover forms a plane perpendicular to the axis of the first holes; the outlet of the first hole is formed on one side surface of the body, and the inlet of the second hole is formed on the inner side surface of the cover.

[0014] The plug includes a plug body accommodated in the first hole and having a cover contact surface that selectively contacts the plug blocking surface to block the second hole, and a tip that protrudes from the cover contact surface of the plug body and is movably inserted into the second hole. The tip protrudes outward from the exit of the second hole and can enter the interior of the second hole by an external force.

[0015] A bottom member is coupled to the other side of the body; the plug can be elastically supported toward the second hole by an elastic member.

[0016] Another aspect of the present invention provides a laminated core manufacturing device including: the adhesive applicator described above; and a blanking unit for blanking the material on one side of the adhesive applicator.

[0017] According to the present invention, the processing of an adhesive applicator is easy, the precision of an adhesive nozzle is improved, the height regulation and processing of adhesive nozzles are easy, the time required for assembling or cleaning the adhesive nozzle can be shortened, the amount of adhesive applied can be precisely managed, and the number of parts and manufacturing cost of the adhesive nozzle can be reduced.

[0018] 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:

[0019] Fig. 1 is a perspective view showing an example of a laminar and a laminated core;

[0020] FIG. 2 is a cross-sectional view showing one embodiment of an adhesive applicator for manufacturing a laminated core according to the present invention;

[0021] Fig. 3 is a cross-sectional view showing the adhesive applicator illustrated in Fig. 2 in an exploded form;

[0022] Figure 4 is a drawing showing various examples of nozzle opening and closing plugs; and

[0023] FIG. 5 is a drawing illustrating an example of a progressive mold type laminated core manufacturing device according to an embodiment of the present invention.

[0024] 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.

[0025] The terms used in this specification are used to describe embodiments of the present invention, and when a component is said to be "connected" to another component, it should be understood that while it may be directly connected to that other component, it also includes an indirect connection relationship, i.e. a connection relationship in which another component exists in between.

[0026] In this specification, terms such as “include” or “have” should be understood to not exclude the possibility of adding features or components other than those described in the specification.

[0027] Hereinafter, with reference to FIGS. 2 to 5, an adhesive applicator for manufacturing a laminated core according to an embodiment of the present invention and a laminated core manufacturing apparatus having the same are described.

[0028] First, referring to FIGS. 2 to 5, an adhesive applicator for manufacturing a laminated core according to an embodiment of the present invention is a device that applies an adhesive to a material (S) for manufacturing a laminated core that is intermittently transported, for example, a material (Lamina) formed by blanking a metal strip, in order to bond the interfaces of the material.

[0029] And, a laminated core manufacturing device according to one embodiment of the present invention is a device that manufactures a laminated core by bonding the interfaces of laminates for manufacturing the laminated core with an adhesive, for example, a device that applies an adhesive to a metal strip such as an electrical steel plate, blanks the metal strip to form a laminae, and integrates the interfaces of the laminae sequentially formed by blanking with an adhesive to manufacture the laminated core.

[0030] The adhesive applicator (100) applies an adhesive to the surface of the material described above, i.e., the metal strip, for interfacial bonding of the laminae forming the laminated core, and the adhesive is interposed at the interface of the laminae by the adhesive applicator (100). More specifically, the adhesive applicator (100) may simultaneously apply an adhesive to multiple points on the surface of the material for interfacial bonding of the laminae.

[0031] For example, the adhesive applicator (100) applies adhesive to a portion of a metal strip (S) that is intermittently transported to form the lamina (L), more specifically, to an area where the formation of the lamina is scheduled.

[0032] And the above-mentioned laminated core manufacturing device can be formed of a device, particularly a progressive die, that manufactures a laminated core by an adhesive fixing method, i.e., a bonding method, as shown in the example in Fig. 5.

[0033] In the progressive mold type laminated core manufacturing device described above, the adhesive applicator (100) applies adhesive to the material (S) that is intermittently transported, i.e., the metal strip.

[0034] The adhesive applicator (100) according to the present embodiment includes a body (110) in which a plurality of adhesive channels are formed, a cover (Cover; 120) covering the body (110), and plugs (Plug; 130) provided in the body.

[0035] The body (110) has a plurality of first holes (111) forming the adhesive flow path. And the cover (120) has a plurality of second holes (121) communicating with the first holes (111) to discharge the adhesive to the outside.

[0036] The plug (130) is accommodated inside the first holes (111). More specifically, the plug (130) is provided so as to be movable along the axis (X) of the first holes inside the first holes (111) to open and close the second holes (121), and is brought into surface contact with the inner surface of the cover (120) to close the second holes (121). In the present embodiment, the inner surface of the cover (120) faces one side of the body (110) in parallel.

[0037] The inner surface of the cover (120) selectively makes surface contact with the plug (130) and forms a plug blocking surface (122) perpendicular to the axis (X) of the first holes. In addition, the plug (130) is blocked by the inner surface of the cover (120), particularly by the plug blocking surface (122) described above, thereby limiting its movement. That is, the plug blocking surface (122) becomes a stopper that limits the movement of the plug, and when the plug (130) makes surface contact with the inner surface of the cover, the second hole (121) is blocked, thereby preventing discharge of the adhesive.

[0038] In this embodiment, one side of the body (110) and the inner side of the cover (120) are in surface contact. And, the interface of the body (110) and the cover (120) forms a plane perpendicular to the axis (X) of the first holes, and the outlet of the first hole (111) is formed on one side of the body (110), and the entrance of the second hole (121) is formed on the inner side of the cover (120).

[0039] As in the example shown in Fig. 2, when the adhesive applicator (100) discharges the adhesive upward, the cover (120) covers the upper side of the body, the outlet of the first hole (111) is formed on the upper surface of the body (110), and the inlet of the second hole (121) is formed on the lower surface of the cover (120). Conversely, when the adhesive applicator discharges the adhesive downward, the outlet of the first hole (111) is formed on the lower surface of the body (110), and the upper surface of the cover (120) becomes the inner surface of the cover where the inlet of the second hole (121) is formed.

[0040] The above plug blocking surface (122) is a plane that is perpendicular to the axes of the first holes (111) and makes surface contact with the plug. Accordingly, the processing and dimension management of the first hole (111), the second hole (121) and the plug can be easily performed, and the protruding lengths of the tips (132) described later can be uniformly regulated. In addition, the first hole (111) and the second hole (121) are formed on the same axis, and the second hole (121) forms a nozzle having a smaller diameter than the first hole (111).

[0041] The plug (130) includes a plug body (131) accommodated in the first hole (111) and a tip (Tip; 132) formed on the plug body (131). The plug body (131) has a cover contact surface (131a) that selectively comes into surface contact with the plug blocking surface (122) to block the second hole (121), and the cover contact surface (131a) faces the plug blocking surface (122).

[0042] And the tip (132) protrudes from the cover contact surface (131a) of the plug body and is movably inserted into the second hole (121). In the present embodiment, the tip (132) protrudes outward from the exit of the second hole (121) and can enter the interior of the second hole (121) by an external force.

[0043] That is, when the tip (132) is pressed by the material (S), the plug body (131) together with the tip (132) retracts (descends) and is separated from the plug blocking surface (122) of the cover, thereby opening the second hole (121).

[0044] And, for example, a bottom member (140) is coupled to the other side of the body (110), the lower part of the body (110), and the plug (130) is elastically supported toward the second hole (121) by an elastic member (150) such as a spring. The elastic member (150) is supported by the bottom member (140), and in the present embodiment, the bottom member (140) forms the bottom of the adhesive applicator (100). For assembling the elastic member, a groove (141) for accommodating the lower end of the elastic member may be formed in the bottom member.

[0045] The shape of the above plug can be varied in various ways, and as illustrated in Fig. 4, various shapes of tips can be formed on a cylindrical plug body (131) having a cover contact surface perpendicular to the axis of the first hole of the choir, and the size of the plug body (131) can also be varied in various ways. Of course, the shape of the plug body (131) is not limited to a cylindrical shape, and for example, a hexahedral shape is also possible.

[0046] In this embodiment, when the plug body (131) moves toward the second hole (121) and comes into close contact with the plug blocking surface (122), the tip (122) protrudes a certain distance outside the second hole (121), and the plug body (131) blocks the second hole (121). In particular, since the first hole (111) is formed on one flat side of the body, the second hole (121) is formed on the flat inner side of the cover, and the inner side of the flat cover is structured to restrict movement of the plug body, processing of the adhesive applicator is easy and dimensional management of each component is easy.

[0047] The above plug (130) is also called a nozzle ball, and when the tip (132) is pressed, the second hole (121) is opened by the retraction (descent) of the plug body (131), and thus adhesive is discharged through the second hole (121). The diameter of the first hole (111) may increase toward the bottom member (140).

[0048] Meanwhile, a sealing groove for mounting a sealing member (161) such as an O-ring is formed on one side of the body (110), and a sealing groove for mounting a separate sealing member (162) may also be formed on the bottom member (140).

[0049] According to the present embodiment, when the tip (132) is pressurized by the material (S), the adhesive is applied to the surface of the material while being discharged through the second hole (121). That is, the adhesive applicator may include a pressure-type adhesive nozzle as in the present embodiment.

[0050] This embodiment has a structure in which a plurality of nozzles, i.e., second holes (121), are integrally formed in a single adhesive applicator (100), and adhesive can be applied to a plurality of points simultaneously. The body (110) and the cover (120) can be manufactured in a plate shape, and the body can be referred to as a body plate that accommodates the plug, i.e., the nozzle ball, and the cover can be referred to as a ball clamping plate or cover plate that restrains the plug.

[0051] The above body and cover can be joined by fastening elements such as bolts, and the cover can also be fixed to the body by a separate nozzle holder.

[0052] Although not shown, the adhesive applicator (100) receives adhesive from an adhesive supplier (T), i.e., a dispenser, and the adhesive supplied from the adhesive supplier is distributed to the first holes of the body (110).

[0053] The above adhesive applicator (100) can be applied to a laminated core manufacturing device of the progressive mold type as described above, and at this time, the adhesive applicator (100) is provided in the mold (10; Dies) of the press device, and the adhesive discharged through the second hole (121) is applied to the surface of the above-described metal strip (S).

[0054] In this embodiment, the mold (10) includes an upper mold (10A) that can be raised and lowered, and a lower mold (10B) provided on the lower side of the upper mold (10A), and the metal strip (S) is supplied between the upper and lower molds described above and passes between the upper and lower molds at a preset length at one pitch. In addition, the adhesive applicator (100) is provided in the lower mold (10B) and discharges adhesive upward.

[0055] Of course, the adhesive applicator (100) may be provided on the upper mold (10A) to discharge adhesive downward, and the adhesive may be applied to the upper surface of the metal strip (S).

[0056] The above-mentioned upper mold (10A) is provided with a plate (20) that presses the metal strip (S) downward when the upper mold (10A) is lowered and functions as a stripper when the upper mold (10A) is raised. Since the plate that functions as a stripper in a progressive mold is a known structure, additional description is omitted. Drawing reference numeral 30 denotes a spring that elastically supports the plate (20).

[0057] As described above, the laminated core manufacturing device according to the present embodiment can be implemented as a progressive mold type device including the adhesive applicator (100) described above, and can sequentially form laminae (L) by applying an adhesive to a continuously transported metal strip (S) and periodically blanking the metal strip (S), and can manufacture a laminated core (C) by combining a plurality of laminae (L) at a time.

[0058] A laminated core manufacturing device according to one embodiment of the present invention includes the above-described adhesive applicator (100) and a blanking unit for blanking the material (S) to form the laminae (L). The blanking unit blanks the material at one side of the adhesive applicator (100), more specifically, downstream (based on the material transport direction) of the adhesive applicator (100).

[0059] The above blanking unit includes a blanking punch (210) and a blanking die (220) facing the blanking punch. In the present embodiment, the blanking punch (210) is provided in the upper die (10A), and the blanking die (220) is provided in the lower die (10B).

[0060] And, a stacking die (300) that implements alignment and stacking of the laminae is placed at the bottom of the blanking die (220). The stacking die (300) includes a squeeze ring (310) installed at the bottom of the blanking die (220), and the squeeze ring (310) can induce alignment, stacking, and straight passage of the laminae (L) below the blanking die (220).

[0061] The above squeeze ring (310) is a component that passes downward while aligning the laminae (L) sequentially formed by the interaction of the blanking punch and the blanking die in a coaxially stacked state, and guides the alignment and movement of the laminae (L). The squeeze ring (310) itself is a technology known to those of ordinary skill in the art.

[0062] The above blanking punch (210) and die (220) are devices for blanking the material, i.e., the metal strip (S), for manufacturing the laminae (L), and sequentially form the laminae (L) by punching the metal strip (S), and simultaneously with the punching (blanking) of the material, push the formed laminae (L) into the inside of the squeeze ring (310).

[0063] In addition, a back pressure unit (400) that supports the bottom of the laminated core (C) discharged from the laminated die (300) may be provided on the lower side of the laminated die (300).

[0064] In the present embodiment, the laminated die (300) forms a laminated core (C) by passing the laminae (L) introduced from the upper side of the squeeze ring (310) in a laminated state. More specifically, the laminated die (300) continuously forms laminated cores (C) by integrating a plurality of the laminae (L) passing through the interior of the laminated die from top to bottom by adhesive method and discharges them downward.

[0065] The above-mentioned back pressure unit (400) is provided so as to be able to rise and fall on the lower side of the stacking die (300) so as to sequentially support the stacked cores (C) discharged from the stacking die (300). The back pressure unit (400) advances upward toward the lower end (exit) of the stacking die (300) to support the bottom surface of the stacked core (C) discharged from the stacking die (300), and descends while supporting the stacked core (C). Then, after one stacked core is completely taken out from the back pressure unit, it rises again to support the bottom surface of the next stacked core. Since the function of the back pressure unit itself and the stacked core taking-out mechanism are techniques known to those skilled in the art, additional description thereof will be omitted.

[0066] And the laminated die (300) may include a heater (320; Heater) that implements curing of the adhesive by heating and combines multiple laminae (L) at a time, and may further include a pinch mechanism (330; Pincher) to prevent the laminated core (C) from falling.

[0067] And, a guide (340) for guiding the laminae (L) may be provided between the squeeze ring (310) and the pinch mechanism (330). In the present embodiment, the heater (320) is provided in the area between the squeeze ring (310) and the pinch mechanism (330), and the guide (340) is provided inside the heater (320), but is not limited thereto.

[0068] A high-frequency induction heating device can be applied to the above heater (320), but it is obvious that the type of the heater is not limited thereto, and since the squeeze ring, heater, and pinch mechanism are configurations known to those skilled in the art, additional descriptions thereof are omitted.

[0069] As described above, the laminated core manufacturing device according to the present embodiment can heat / cure the adhesive present between the layers of the laminae (L) to form the laminated core (C) described above by integrating a predetermined number of the laminae (L) and integrating a predetermined number of the laminae by adhesive. Of course, the heater may be omitted depending on the type of adhesive.

[0070] In addition, the upper mold (10A) may further be provided with at least one punch (11) for forming a predetermined slot or hole (e.g., a center hole of the above-described lamina) in the lamina (L), and a die hole (12) facing the above-described punch (11) may be provided on the upper side of the lower mold (10B). Various examples of molding devices provided in the upper and lower molds for processing the shape of the lamina in a progressive molding device for manufacturing a laminated core are known, and therefore, additional descriptions thereof are omitted.

[0071] In Fig. 5, the laminae (L) stacked vertically inside the stacked die (300) are separated based on the solid line, and the boundary indicated by the dotted line illustrates the part (adhesive interface) where adhesion occurs. In order for the stacked cores (C) to be separated based on the solid line, the adhesive applicator (100) omits adhesive application at predetermined timings. For example, the adhesive applicator (100) may be lowered to a predetermined height at each time when adhesive application is omitted (idle process), so that the plug (120) may be prevented from being pressed by the material (S).

[0072] In addition, the above-described stacking die (300) can also rotate the laminas by a predetermined angle for the above-described index rotation stacking. For example, the squeeze ring (310) and the pinch mechanism (330) can rotate simultaneously at the same angular velocity.

[0073] The technology of manufacturing an adhesive laminated core by forming laminae by punching out the above metal strips and integrating the laminae by adhesive is well known to those skilled in the art, so further description thereof is omitted.

[0074] As described above, embodiments according to the present invention have been examined, 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.

[0075] 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.

[0076] The present invention can be used in the manufacturing of laminated cores and motors, and according to the present invention, an adhesive applicator applicable to a progressive mold can be easily manufactured.

Claims

1. An adhesive applicator for manufacturing a laminated core that applies an adhesive to intermittently transported materials to bond the interfaces of laminae formed by blanking; A body having a plurality of first holes forming a flow path of an adhesive; A cover having a plurality of second holes communicating with the first holes to discharge the adhesive to the outside, the cover being coupled to one side of the body and covering one side of the body; and Includes plugs that are movably accommodated along the axis of the first holes inside the first holes to open and close the second holes, and that are in surface contact with the inner surface of the cover that faces parallel to one side of the body to block the second holes; An adhesive applicator for manufacturing a laminated core, wherein the inner surface of the cover selectively contacts the plug and forms a plug blocking surface perpendicular to the axis of the first holes.

2. In paragraph 1, An adhesive applicator for manufacturing a laminated core, characterized in that one side of the body and the inner side of the cover are in surface contact; an interface between the body and the cover forms a plane perpendicular to the axis of the first holes; and an outlet of the first hole is formed on one side of the body and an inlet of the second hole is formed on the inner side of the cover.

3. In paragraph 1, The plug comprises a plug body accommodated in the first hole and having a cover contact surface that selectively makes surface contact with the plug blocking surface to block the second hole, and a tip that protrudes from the cover contact surface of the plug body and is movably inserted into the second hole; The above tip is an adhesive applicator for manufacturing a laminated core, which protrudes outward from the exit of the second hole and can enter the interior of the second hole by an external force.

4. In paragraph 1, An adhesive applicator for manufacturing a laminated core, wherein a bottom member is coupled to the other side of the body; and the plug is elastically supported toward the second hole by an elastic member.

5. An adhesive applicator as described in any one of paragraphs 1 to 4; and A laminated core manufacturing device including a blanking unit for blanking the material on one side of the adhesive applicator.

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