KR101713916B1 - Adhesive Type Laminate Core Manufacturing Apparatus - Google Patents

Abstract

The present invention provides an adhesion-type laminate core manufacturing apparatus which allows a strap-shaped material with an adhesive layer coated on the surface to pass through, successively forms lamina members in a certain shape, and successively manufactures laminate cores which comprise lamina members integrally formed by predetermined number through adhesion between layers. According to an embodiment of the present invention, the adhesion-type laminate core manufacturing apparatus comprises: a material heating unit which locally heats the materials for dividing between the laminate cores and removes surface adhesion force for certain positions in a longitudinal direction of the materials; a blanking unit which performs blanking on the materials to successively form the lamina members; and a laminate unit which integrally forms the lamina members to successively manufacture the laminate cores. The material heating unit comprises a resistance heater which contacts the materials to locally generate heat on the materials. According to the present invention, the apparatus of the present invention is able to continuously manufacture a laminate core in which groups of lamina members are made as one body by adhesion between layers by using strap-shaped materials whose surfaces are in advance coated with an adhesive layer.

Description

[0001] The present invention relates to an adhesive laminate core manufacturing apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core manufacturing apparatus for manufacturing an iron core or core such as a motor or a generator, and more particularly, to an adhesive laminated core manufacturing apparatus for producing laminated cores by interlaminarly bonding lamina members (thin plates).

Generally, a laminate core (laminate core) manufactured by laminating a lamina member, for example, a plurality of metal thin plates and integrating them together, is used as a rotor or a stator of a generator or a motor As a method of manufacturing the laminated core, that is, a laminated core manufacturing method of laminating and integrally fixing the laminated member, a tap fixing method using an interlock tap, a welding fixing method using laser welding, a riveting method Are known. The laminated core comprises all or part of the core for the rotor or stator.

The tap-fixing method is disclosed in Korean Patent Laid-Open Nos. 10-2008-0067426 and 10-2008-0067428 as a technique for producing a laminated core. In particular, in the tap-fixing method, embossing is difficult due to the thinning of the material, that is, the steel sheet, which shows the limitation as a manufacturing technique of a laminated core. The above-mentioned patent publications and the following patent documents disclose laminated cores of various kinds and shapes.

In recent years, there has been proposed a bonding fixation method in which a unit thin plate of the laminated core, that is, laminar members constituting a sheet, is bonded and integrated with an adhesive, which is disclosed in Korean Patent Publication No. 10-1996-003021 and Japanese Laid- 5-304037 discloses the adhesive fixing method.

In the above-mentioned patent documents, Japanese Patent Application Laid-Open No. 5-304037 discloses that a material for manufacturing a motor core, that is, a steel sheet is supplied to a first press molding machine and a second press molding machine by a conveying roller, passes through the first press molding machine An adhesive is applied to the steel sheet by a coating roller and a nozzle before doing so.

The core material or lamina member sequentially stacked in the inner spaces of the first press molding machine and the second press molding machine by the blanking of the material is integrated by the adhesive to thereby produce the adhesive laminated core. According to the conventional adhesive fixing method, that is, the adhesive laminated core manufacturing method, the cost can be reduced as compared with laser welding, and the steel sheet can cope with thinning.

Korean Patent Laid-Open Publication No. 10-2006-0044726, split core motor stator and assembling method thereof Korean Patent Laid-Open Publication No. 10-2008-0067426, core body, core wing, and prefabricated laminated core Korean Patent Laid-Open Publication No. 10-2005-0015175, a laminated core manufacturing apparatus Japanese Unexamined Patent Application Publication No. 5-304037, a method for producing a laminated core Japanese Unexamined Patent Application Publication No. 2009-297758, a device for manufacturing a laminated iron core

An object of the present invention is to provide an adhesive laminated core manufacturing apparatus capable of continuously producing laminated bodies for cores such as motors and generators, that is, laminated cores, by supplying a strip-shaped material having an adhesive layer on its surface.

One aspect of the present invention is a method for producing The laminated cores including laminar members integrally formed by a predetermined number of layers by interlaminar adhesion are sequentially laminated by passing a strip-shaped material having a surface coated with an adhesive layer one by one at predetermined pitches, The present invention also provides an adhesive laminated core manufacturing apparatus.

The adhesive laminated core manufacturing apparatus comprising: a workpiece heating unit for locally heating the workpiece for partitioning between the laminated cores to lose the surface adhesion force at predetermined positions along the longitudinal direction of the workpiece; A blanking unit for sequentially forming the lamina members by blanking the material; And a laminate unit for sequentially manufacturing the laminated cores by integrating the lamina members.

The blanking unit includes: A blanking punch provided in a vertically movable upper mold for pressurization and blanking of the workpiece, the blanking punch being disposed downstream of the workpiece heating unit with respect to a conveying direction of the workpiece; And a blanking die supported by a lower mold provided below the upper mold and having a blanking hole facing the punch and stacked on the upper side of the laminate unit.

The material heating unit may include a resistance heater disposed upstream of the blanking unit to selectively synchronize the blanking unit to form a loss of adhesive strength on the surface of the blank each time the blanking advances a predetermined number of times . The resistance heater is brought into contact with the workpiece to locally heat the workpiece.

The resistance heater includes: And a pair of electrodes spaced apart from each other to resistively heat the local region of the workpiece in contact with the workpiece.

The resistance heater further comprises an electrode support for supporting the pair of electrodes; The pair of electrodes may be elastically supported on the electrode support in parallel with each other.

The resistance heater may be provided in any one of a lower supporter supporting the bottom surface of the workpiece and an upper pressurizing table capable of being elevated above the lower supporter. One of the pair of electrodes may be provided in the lower supporter, and the other electrode may be provided in the upper pressing bar.

The lower supporter may be a part of the lower mold integrated with the lower mold. The upper pressurizing belt may be formed as a part of the upper mold as a unit with the upper mold.

The adhesive laminated core manufacturing apparatus comprises: And a scraper provided upstream of the resistance heater to scrape the adhesive layer to expose a surface of the material. The scraper is provided upstream of the resistance heater with respect to a conveyance direction of the material.

The upper die includes a liftable upper frame and a plate-shaped pusher provided below the upper frame to press the work toward the lower die.

Wherein the blanking punch is raised and lowered once by the upper mold every time the material moves by one pitch; The workpiece heating unit selectively synchronizes the blanking unit to form the loss of adhesion force on the upper and lower sides of the workpiece at regular intervals at a plurality of pitches along the longitudinal direction of the workpiece.

The blanking die may be provided in the lower mold with a distance of N pitch (N is a natural number equal to or larger than 1) in the material heating unit along the conveying direction of the material. The laminate unit may be rotatably mounted on the lower mold.

The adhesive laminated core manufacturing apparatus according to an embodiment of the present invention has the following effects.

First, according to one aspect of the present invention, a laminated core in which laminar members are integrated in an interlayer-bonding manner by the number of materials can be continuously manufactured by using a strip-shaped material having an adhesive layer precoated on its surface.

Secondly, according to one aspect of the present invention, since the adhesive force loss portion for interlayer division is formed on the surface of the workpiece at predetermined intervals in synchronism with the blanking process of the strip-shaped workpiece, the lamina members can be easily divided every predetermined number It is easy to manufacture a laminated core and to divide it into layers.

According to an aspect of the present invention, there is provided an image forming apparatus comprising: an image forming unit for forming an image on a recording medium, the medium being blanked at a pitch of 1 pitch along the length of the medium while being transported by one pitch, The material heating unit of the resistance heating type is driven so that the adhesion loss portion for interlaminar separation is formed so that the predetermined number of lamina members can be integrated and the boundary between the laminated cores can be accurately set.

Fourthly, according to one aspect of the present invention, since the region where the laminar member is aligned / laminated with the lamina member and the region where the lamina member is integrated with the region where the laminated core is discharged are precisely interlocked and integrally rotated in the laminate unit, The thickness deviation of the core can be minimized and a core with high precision can be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the present invention will become better understood with reference to the following description taken in conjunction with the following detailed description of embodiments of the invention,
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view schematically showing a structure of an adhesive laminated core manufacturing apparatus according to an embodiment of the present invention, with reference to a conveyance direction of a work. FIG.
FIG. 2 is a view showing a state where a material is supplied to the adhesive laminated core manufacturing apparatus shown in FIG. 1; FIG.
3 schematically shows an embodiment of a workpiece heating unit applicable to the adhesive laminated core production apparatus shown in Fig. 1; Fig.
FIGS. 4 to 6 are views showing a process (resistance heating process) in which an adhesion loss portion for interlaminar separation is formed on the surface of a work by the workpiece heating unit shown in FIG. 3;
7 is a longitudinal sectional view schematically showing another embodiment of the adhesive laminated core manufacturing apparatus according to the present invention;
8 is a perspective view showing an example of a laminated adhesive layer that can be manufactured by the present invention and a lamina member for the laminated core.
FIG. 9 is a view showing a process sequence for manufacturing an example of the laminated core shown in FIG. 8; FIG.
10 is a longitudinal sectional view showing a blanking unit and a laminate unit of the adhesive laminated core production apparatus shown in Figs. 1 and 9; Fig.
11 is a cross-sectional view schematically showing the laminate unit shown in Fig. 10;
12 is a cross-sectional view showing the process of integrating lamina members in the interior (laminate hole) of the laminate unit shown in FIG. 11;
13 is a view showing the squeeze member and the rotation housing shown in FIG. 10;
FIG. 14 is a plan view schematically showing one embodiment of a pinch applicable to the laminate unit shown in FIG. 10; FIG. And
Fig. 15 is a view schematically showing the rotation mechanism of the laminate unit shown in Fig. 11. Fig.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be specifically realized will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and additional description thereof will be omitted in the following.

In an embodiment of the present invention, a continuous strip-shaped material is fed by a distance of a predetermined pitch, for example, by blanking to form lamina members of a predetermined shape, And a core such as a motor or a generator by integrally assembling the laminated core by a bonding method.

Specifically, one embodiment of the present invention relates to an adhesive laminated core (hereinafter, referred to as " laminated core ") which is supplied with a strip-shaped material (a strap steel sheet for core production with an adhesive layer coated thereon) Manufacturing apparatus. The laminated core forms at least a part of the stator or the iron core for the rotor.

1 to 3, an example of a bonded laminated core manufacturing system is described as an embodiment (first embodiment) of an adhesive laminated core manufacturing apparatus according to the present invention.

1 is a longitudinal sectional view schematically showing a structure of an adhesive laminated core manufacturing apparatus according to an embodiment of the present invention, with reference to a conveying direction of a work, and FIG. 2 is a cross- FIG. 3 is a view schematically showing an embodiment of a workpiece heating unit applicable to the adhesive-type laminated core manufacturing apparatus shown in FIG. 1 .

1 to 3, an apparatus for manufacturing a bonded laminated core according to an embodiment of the present invention (hereinafter referred to as a "core manufacturing apparatus") comprises a belt-shaped material S (L) are sequentially formed while passing through a laminated core (C), and a laminated core (C) including laminar members integrally formed by a predetermined number of layers by interlayer adhesion is sequentially manufactured .

The adhesive laminated core manufacturing apparatus according to one embodiment of the present invention includes a material heating unit 100 for partitioning between laminated cores C and a blanking unit 100 for sequentially forming the lamina members L through blanking, And a laminate unit (300) for forming the laminated core (C) by integrating the laminar members (L) a predetermined number of times.

When the above-described laminated core (C) is successively produced by using the strip-shaped material (S) coated with the adhesive layer (1) on the surface, the material heating unit (100) (S) in the longitudinal direction of the work (S) by locally heating the work (S) so as to be able to divide the work (S) (2).

According to the present embodiment, the laminar member L is formed for each stroke of the blanking unit 200. The laminar member L having the surface with the lost adhesive force is periodically inserted into the laminate unit by blanking the portion where the adhesive force loss portion 2 is formed every predetermined period. In other words, the laminar member L formed by the blanking unit 200 has a surface in which the adhesive force is periodically lost one by one or two in succession.

The blanking unit 200 sequentially forms the lamina members L by blanking the material and sequentially supplies the lamina members L to the inside of the laminate unit 300 .

The laminate unit 300 sequentially integrates the laminar members L stacked in the vertical direction by the blanking in units of a predetermined number of units. And the laminated cores (C) are interlaminated by a lamina member having the loss of adhesion strength.

In this embodiment, the blanking unit 200 includes a blanking punch 210 provided in the upper die 10 and a blanking die 220 provided in the lower die 20.

More specifically, the upper die 10 is provided so as to be able to move up and down on the lower die 20 for pressing and blanking the work S. The blanking punch 210 is mounted on the upper mold 10 and is disposed downstream of the workpiece heating unit 100 with reference to the conveyance direction of the workpiece S. [ Therefore, the blanking punch 210 moves up and down together with the upper die 10 to blank the work S.

The blanking die 220 has a blanking hole 221 facing the blanking punch 210 and is mounted by the lower die 20 and supported by the lower die 20, As shown in Fig.

In the present embodiment, the workpiece heating unit 100 is provided with the adhesive force loss portion 2 on the surface of the workpiece S every predetermined number of times of the blanking, And can be optionally synchronized.

For example, the blanking punch 210 is moved up and down by the upper die 10 once each time the workpiece S moves by a predetermined pitch. In other words, the material S passes by one pitch between the upper mold 10 and the lower mold 20 every stroke of the press, that is, one stroke of the blanking punch 210, and before the blanking process A process for loss of surface adhesive force is performed at predetermined timing (Timing).

The material heating unit 100 is provided on the blanking unit 200 so as to form the adhesive force loss portion 2 on the surface of the work S at intervals of a plurality of pitches along the longitudinal direction of the work S, The adhesive layer 1 can be locally heated by a resistance heating method selectively and synchronously. In the case where the laminated core (C) is a laminate of ten layers, that is, ten layers, resistance heating is resumed every time the material is fed by 10 pitches. Therefore, the adhesive force loss portion 2 may be formed on the surface of the work S at the same intervals.

The blanking die 220 may be disposed at a distance of N pitches (N is a natural number equal to or greater than 1) in the workpiece heating unit 100 along the conveying direction of the workpiece S, Respectively. The workpiece heating unit 100 includes a resistance heater provided upstream of the blanking unit 200 to resistively heat the workpiece S so as to resist the workpiece S locally.

That is, the resistance heater is configured to contact the workpiece S to implement local heat generation of the workpiece S, wherein the workpiece heating unit 100 includes a workpiece heating unit .

The resistance heater includes a pair of electrodes 111 and 112 spaced apart from each other. Accordingly, when power is applied to the electrodes 111 and 112 in a state where the pair of electrodes 111 and 112 are in contact with the workpiece, the region connecting the electrodes 111 and 112 is locally heated, Thus, the adhesive strength loss portion (2) is formed on the upper and lower sides of the region heated by the pair of electrodes (111, 112).

When one of the pair of electrodes 111 and 112 is referred to as a first electrode 111 and the other is referred to as a second electrode 112 in this embodiment, The electrode 112 is provided upstream of the blanking die 220 with respect to the conveying direction of the work S and is in contact with the lower surface of the work S, but is not limited thereto.

For example, both the first electrode 111 and the second electrode 112 may be in contact with the upper surface of the workpiece S, and either the first electrode 111 or the second electrode 112 One electrode may be in contact with the lower surface of the workpiece S and the other electrode may be in contact with the upper surface of the workpiece S. [

The material heating unit 100, more specifically, the pair of electrodes 111 and 112 is contacted with the work S in a state in which power is applied every predetermined period, thereby forming the adhesive loss portion 2 (Hereinafter referred to as a resistance heating process) is resumed. Therefore, the adhesive layer 2 may be periodically formed on both sides of the workpiece S at predetermined intervals along the longitudinal direction of the workpiece S.

The material S may be a double-sided coating material coated with the adhesive layer 1 on both sides (upper side and lower side), or may be coated on only one side of the upper side and the lower side with the adhesive layer Single-sided coating material may be used. The present embodiment describes an apparatus for producing a laminated core using a material S having an adhesive layer 1 formed on both sides thereof.

In this embodiment, resistance heating is successively performed successively in the region (two pitch sections) where two lamina members are formed every predetermined period, and the adhesive loss portion 2 ). When the material heating unit 100 is resistance-heated only at intervals of one pitch every predetermined cycle, the interlaminar adhesion between the lamina members L stacked inside the laminate unit 300 is relatively weakened in units of a predetermined number However, since the portion where the surface adhesive force is lost and the portion where the surface adhesive force is maintained are interposed, the interlaminar adhesive force can be expressed at a certain level or more. Therefore, by two- It is more stable to implement the interlayer division on the basis of the contact interface where the adhesive force lost portions are interposed.

More specifically, the resistance heater in the present embodiment includes the above-described pair of electrodes 111 and 112 and an electrode support 113 for supporting the electrodes 111 and 112. The pair of electrodes 111 and 112 are provided on the electrode support 113 in parallel with each other.

A region to be resistively heated is determined at one time according to the interval between the pair of electrodes 111 and 112. In this embodiment, the first electrode 111 and the second electrode 112 are divided into a section within a pitch And the interval between the first electrode 111 and the second electrode 112 may be changed. However, the gap between the first electrode 111 and the second electrode 112 may be changed.

The first electrode 111 and the second electrode 112 are arranged in parallel to each other with an interval in the conveying direction of the material S but are spaced apart in the width direction of the material S .

The pair of electrodes 111 and 112 are provided on the electrode support 113 to be elastically supported and mutually insulated. The electrode support 113 is formed of an insulating material and the electrode support 113 is formed with an electrode receiving groove for receiving the pair of electrodes 111 and 112. The electrode receiving groove includes the pair of electrodes 111 , 112) are provided. Accordingly, the pair of electrodes 111 and 112 can be elastically adhered to the work. Examples of the elastic body 114 include coil springs and leaf springs, but the present invention is not limited thereto.

More specifically, the resistance heater may include a lower supporter 20A that supports the bottom surface (lower surface) of the workpiece S, or an upper supporter 20A that is vertically movable on the upper side of the lower supporter 20A, The resistance heater is provided in the lower supporter 20A so that the first electrode 111 and the second electrode 112 are elastically biased toward the bottom surface of the workpiece, . Accordingly, when the upper pressing bar 10A presses down the material, the pair of electrodes 111 and 112 can be elastically brought into close contact with the bottom surface of the work S.

In other words, the material S passes between the upper presser bar 10A and the lower supporter 20A, and the material S is conveyed to the upper presser bar 10A by the lowering of the upper presser bar 10A 10A and the lower supporter 20A so that the first electrode 111 and the second electrode 112 can be elastically brought into close contact with the lower surface of the work S.

Of course, as described above, one of the first electrode 111 and the second electrode 112 may be provided in the lower supporter 20A and the other may be provided in the upper pressure pad 10A.

The resistance heater heats the surface of the material locally at a temperature equal to or higher than the heat-resistant temperature of the material forming the adhesive layer (1), that is, the adhesive, and the adhesive strength loss portion (2) is formed in the adhesive layer (1). Therefore, the heating temperature by the pair of electrodes 111 and 112 may vary depending on the type of the adhesive forming the adhesive layer 1.

For example, a voltage / current applied to the pair of electrodes 111 and 112 is controlled so that a predetermined region of the material S is heated by the pair of electrodes 111 and 112 to a heat resistance temperature A portion heated by the pair of electrodes 111 and 112 is oxidized when the substrate S is locally heated to an oxidation temperature equal to or higher than the oxidation temperature, Is formed.

The upper presser base 10A may form a part of the upper mold 10 so as to be integrally raised and lowered with the upper mold 10. In the present embodiment, the upper supporter 10A and the upper mold 10, It is not an integral type but a mutually divided structure. The lower supporter 20A may be a part of the lower mold 20 so as to integrally move up and down with the lower mold 20. In the present embodiment, the lower supporter 20A and the lower mold 20 are not integrated It is a mutually divided structure.

In other words, the upper die 10 may be divided into a plurality of bodies along the conveying direction of the work S, or may form one integral body. Also, the lower die 20 may be divided into a plurality of bodies along the conveying direction of the work S, or may form one integral body.

In the present embodiment, the upper die 10 is provided with a pusher or a pressing member for pressing the work S toward the lower die 20. Therefore, when the upper die 10 descends, the upper surface of the work S is pushed downward by the pusher 12, so that the work S is pressed toward the lower die 20.

The upper die 10 includes an upper frame 11 provided to be able to move up and down on the lower die 20 and the pusher 12 provided below the upper frame 11. In the present embodiment, the blanking punch 210 is provided on the upper frame 11 more specifically than the upper mold 10 together with the pusher 12.

In the present embodiment, the pusher 12 is a compression plate or a pressure plate that functions as a stripper in the blanking process, a piercing process, etc., and presses the material S toward the lower die 20, And is a plate-shaped pushing plate.

Between the pusher 12 and the upper frame 11 is provided an elastic member (for example, a coil spring 12a) for resiliently pressing the pusher 12, A guide 12b is provided.

The lower mold 20 includes a base frame 21 forming a base of the lower mold 20 and lower dies 22 and 23 provided on the upper side of the base frame.

In this embodiment, the above-described blanking die 220 is provided on the lower die 22, 23. The lower dies 22 and 23 may be divided into a die frame 22 constituting the upper side of the lower die and a die holder 23 provided below the die frame 22.

The die holder 23 supports the die frame 22 and is stacked on the base frame to be supported by the base frame. However, the structure of the die 20 is not limited thereto, and the die holder 23 ) Can be divided into a plurality.

The core manufacturing apparatus locally scrapes the adhesive layer 1 so that the electrical connection between the pair of electrodes 111 and 112 and the workpiece S can be stably performed so that the surface of the workpiece S (E.g., a surface of the strap steel sheet).

In the present embodiment, the scraper 130 scrapes the adhesive layer 1 locally to form an electrode contact groove 3 on the surface of the work S. More specifically, the scraper 130 forms the electrode contact groove 3 in the width direction of the work S on the bottom surface of the work S. In this embodiment, a pair of electrode contact grooves 3 are formed on the bottom surface of the work.

The scraper 130 is more specifically disposed upstream of the pair of electrodes 111 and 112 than the resistance heater, with respect to the conveying direction of the material S. In the present embodiment, the scraper 130 is provided in the lower supporter 20A. However, when the pair of electrodes 111 and 112 are provided on the upper pressing band 10A, the scraper 130 is also provided on the upper pressing band 10A.

The scraper 130 includes a pair of parallel scraping belts 131 wound around a pulley and rotating in the width direction of the workpiece S, And a belt receiver 132 that receives the belt 131.

The belt receiver 132 may be elastically supported toward the surface of the work S. More specifically, the belt receiver 132 is elastically supported by an elastic body 134 such as a coil spring or a leaf spring, so that the scraping belt 131 is elastically supported on the surface (lower side) As shown in Fig.

In this embodiment, the belt receiver 132 is supported by a base mount 133 provided on the lower supporter 20A, and the elastic member 134 is provided inside the base mount 133. The pair of scraping belts 131 are arranged at the same interval as the pair of electrodes and are connected to a driving shaft 131a rotated by a motor 135 and rotate synchronously.

Also, a plurality of blades 131b are provided on the surface of the scraping belt 131, and the scraper 130 is disposed one pitch upstream of the resistance heater. Of course, it is needless to say that the scraper applicable to the present embodiment is not limited to the above-described example.

The scraper 130 may be vertically moved by an elevator 400, for example, a lift mechanism such as a cam mechanism or a hydraulic / pneumatic cylinder. In the present embodiment, the scraper 130 is provided on the lower supporter so as to be movable up and down.

The scraper 130 is lifted up by the elevator 400 to advance toward the lower side of the work S and the scraping belt 131 is moved upward And protrudes upward from the upper surface of the lower supporter 20A.

In other words, when the elevator 400 moves (advances) the scraper 130 toward the workpiece S at predetermined intervals, when the workpiece 10 descends, the workpiece S is pushed, The lower surface of the material S can be closely attached to the scraper belt 131, particularly to the blade 131b. In this embodiment, the elevator 400 is coupled to the base mount 133.

Accordingly, after the scraper 130 is lifted up to the top dead center at predetermined intervals by the elevator 400 and the processing of the electrode contact groove 3 is completed, the scraper 130 is retracted (descended) by the elevator 400 So that contact with the workpiece S is prevented until the next cycle.

3, the elevator 400 includes a lifting body 410 supporting the scraper 130 and a lifter 420 for moving the lifting body 410 up and down, .

In the present embodiment, the lifting body 410 is fixed to the base mount 133, and the base mount 133 moves integrally with the lifting body 410. The lifting rod 430 is coupled to the lifting body 410 through the lifter 420 in a vertical direction.

The elevator 400 according to the present embodiment has a cam structure, and the elevation / descent of the lifting body 410 is realized by sliding the lifter 420 horizontally. In other words, the lifting body 410 and the lifting rod 430 are lifted in place, and the lifting body 410 is vertically moved by the lifter 420 moving leftward and rightward. Of course, the structure and operation of the elevator are not limited to the above-described examples.

Hereinafter, the operation process of the workpiece heating unit 100 according to the present embodiment, i.e., the resistance heating process will be described in more detail with reference to FIGS.

The material S is moved by a predetermined distance (one pitch) for every cycle of the upper die 10, i.e., one stroke of the upper die 10, and passes between the upper supporter 10A and the lower supporter 20A, The upper supporter 10A descends as shown in (b) of FIG. 4 when a predetermined portion of the work S reaches a position where the electrode contact groove is formed as shown in (a) of FIG.

In the present embodiment, the upper supporter 10A descends simultaneously with the upper mold 10 described above, and the formation of the electrode contact groove 3 and the blanking (formation of the lamina member) .

More specifically, as shown in FIG. 4B, when the upper supporter 10A descends, the upper surface of the work S is pushed by the upper supporter 10A, And the lower surface is in close contact with the lower supporter 20A. At this time, the scraping belt 131 and the pair of electrodes 111 and 112 are elastically brought into close contact with the lower surface of the workpiece S, and a pair of scraping belts 131 Electrode contact grooves 3 are formed on the lower surface of the work S. Since the power is not applied to the pair of electrodes 111 and 112, the resistance heating process does not proceed.

4C is a view showing a state in which the upper supporter 10A is raised after the electrode contact groove 3 is formed on the lower side of the material S. FIG.

4 (c), after the electrode contact groove 3 is formed on the lower surface of the workpiece S, the workpiece S is shifted by one pitch again so as to be shown in Fig. 5 (a) When the electrode contact groove 3 faces the pair of electrodes 111 and 112, the upper supporter 10A descends again as shown in FIG. 5 (b). At this time, The upper mold 10 also descends to advance the blanking of the material (formation of the lamina member).

5 (b), when the upper supporter 10A descends, the upper surface of the work S is pushed by the upper supporter 10A, And the lower surface is in close contact with the scraping belt 131 and the pair of electrodes 111 and 112. More specifically, the electrodes 111 and 112 are brought into contact with the electrode contact groove 3.

A pair of electrode contact grooves 3 are additionally formed on the lower surface of the workpiece S by the rotation of the scraping belt 131, Power is applied to the pair of electrodes 111 and 112. Therefore, the adhesive strength loss portion 2 is formed on the upper and lower sides of the region where the pair of electrodes 111 and 112 are contacted by resistance heating.

5C shows a state in which an adhesive strength loss portion 2 is formed on the upper and lower sides of the work S and an electrode contact groove 3 is formed one pitch upstream in the adhesive strength loss portion 2 And the upper supporter 10A is raised.

5 (c), after the electrode contact groove 3 is further formed on the lower surface of the workpiece S, the workpiece S moves again by one pitch to form When the electrode contact groove 3 formed further faces the pair of electrodes 111 and 112, the upper supporter 10A descends again as shown in FIG. 6 (b) At this time, the upper die 10 is simultaneously lowered to advance blanking of the work.

6 (b), when the upper supporter 10A is lowered, the upper surface of the work S is pushed by the upper supporter 10A, The pair of electrodes 111 and 112 are in close contact with the lower surface, particularly the electrode contact groove 3. At this time, the scraper 130 is moved (lowered) to the bottom dead center by the elevator 400 to prevent contact with the work S.

When power is applied to the pair of electrodes 111 and 112, the upper and lower side surfaces of the region where the pair of electrodes 111 and 112 are in contact with each other are subjected to resistance heating to cause the loss of adhesion strength portion 2 Respectively. Therefore, the adhesive strength loss portion 2 is dividedly formed on the work S at a pitch distance.

6 (b), the upper supporter 10A rises as shown in (c) of FIG. 6 and the operation of the resistance heater is stopped. But does not proceed during the cycle (the time at which the material is transported at a predetermined pitch).

After the material S is fed at a predetermined pitch, the process of forming the electrode contact groove 3 is recovered as shown in Fig.

For example, when the laminated core (C) has a 10-layer structure composed of 10 lamina members, the resistance heating process is resumed every time the material (S) moves 10 pitches, (C) can be implemented. In the lamination structure of the lamina members shown in Fig. 2, the dotted line indicates the portion where the interlaminar bond is made and the solid line is the portion where the interlaminar cleavage is performed by the adhesive loss portion 2.

Of course, the pair of electrodes 111 and 112 may be widened to resistively heat the two pitch sections at the same time, and the loss of adhesive strength may be formed simultaneously on the upper and lower sides of the two-pitch section.

FIG. 7 is a view showing another embodiment (second embodiment) of the core manufacturing apparatus according to the present invention, in which the pair of electrodes 111 and 112, more specifically the resistor heater, (Not shown).

In other words, in this embodiment, the constituent elements for pressing the material S toward the pair of electrodes 111 and 112 and the constituent elements for supporting the blanking punch 210 are integrated into one body . In addition, the component supporting the material heating unit 100 and the component supporting the blanking die 220 are integrally formed into a single body. The lower mold 20 is formed with a heater accommodating portion 20B on which the resistance heater is mounted.

The workpiece heating unit 100 or the resistance heater is provided upstream of the blanking die 220 and the scraper 130 and the pair of electrodes 111 , 112 are arranged at a pitch interval. Since the workpiece heating unit 100, the scraper 130, and the elevator 300 described in the above-described embodiment (first embodiment) can be applied to the present embodiment in the same manner, repetitive description is omitted, The size may be changed.

Accordingly, the pusher 12 in the present embodiment functions as a stripper in the blanking process, the piercing process, and the like while the material S is held in the lower mold 20 in the blanking process and the resistance heating process, And is a pushing plate in the form of a plate in this embodiment. For reference, the dotted line in the lamination structure of the lamina members shown in Fig. 7 is the portion where the interlaminar bond is made, and the solid line is the portion where the interlaminar cleavage is performed by the adhesion loss portion 2.

The top and bottom surfaces of the uppermost lamina member of each laminated core (C) and the upper and lower surfaces of the lamina member of the lowest lamina are surfaces with loss of surface adhesion due to loss of adhesion strength.

FIG. 8 is a perspective view showing an example of a laminated adhesive laminate that can be manufactured according to an embodiment of the present invention and a lamina member, and FIG. 9 is an example of a process flowchart showing a process of molding a lamina member in FIG. 8, the material S is formed by a step S1 of forming an electrode contact groove 3, a resistance heating step S2 forming a loss of adhesion strength, and a piercing step S3, S4 And the blanking step S5 are sequentially performed. At this time, the step S1 for forming the electrode contact groove 3 and the step S2 for resistance heating are selectively performed for every predetermined pitch. Of course, it is needless to say that the order of forming the lamina member L is not limited to the above example.

10 to 14, the laminate unit 300 integrates the lamina members L sequentially formed by blanking the material S, more specifically, the laminate unit L, The laminar members L are integrated into a single lump.

More specifically, the laminate unit 300 includes an adhesive curing unit 310 for curing an interlayer adhesive of a laminate member (L) continuously passing through a laminate hole (laminate hole) 300a, And a pincher for holding the pinch mechanism 320, that is, the laminated core member C, provided below the hardener 310. The laminate holes 300a are formed in the laminate unit 300 in the vertical direction so that the laminate members L are stacked in the vertical direction and are integrated while moving continuously.

The adhesive hardener 310 is an apparatus for melting and curing an adhesive present between layers of the lamina members L. In this embodiment, the adhesive is cured by high frequency induction heating so that the adhesive curing speed is increased, And a high-frequency induction heater for integrating the laminated lamina members L into one. Since the high-frequency induction heating itself is a well-known one, a further description thereof will be omitted. The present invention is a method for efficiently curing an adhesive existing between layers of lamina members and minimizing thermal influence on peripheral products, And starts heating.

A lamination guide 330 for guiding the movement of the lamina members L to the hardening holes is formed in the adhesive hardener 310 through a hardening hole passing through the lamina members and forming a hardening space of the adhesive, And the laminating guide 330 is preferably made of engineering ceramics more specifically than a nonconductive material so as not to be influenced by high frequency induction heating.

The lamination guide 330 may have a hollow block structure such as a ring type or a barrel type, or a split type structure in which the adhesive layer is disposed inside the adhesive curing device. A gap may be formed between the inner circumferential surface of the curing hole and the lamination guide 330 in consideration of the thermal expansion of the material to be heated (laminated members) and the lamination guide 330.

The pinch mechanism 320 prevents a sudden drop of the product discharged downward from the adhesive hardener 310, that is, the laminated core C formed by the unification of the lamina members L. To this end, the pinch mechanism 320 is provided below the adhesive hardener 310 and applies a lateral pressure to the laminated core C to prevent the laminated core C from falling down.

The laminate unit 300 applies pressure (side pressure) to the side surfaces of the lamina members L moving downward from the upper side of the adhesive curler 310 toward the adhesive curler 310, And a squeeze member 340 for tightening the lugs L, that is, a squeezer for alignment.

The squeeze member 340 is formed by laminating the laminate members L sequentially formed by blanking of the workpiece S in the state of being aligned at the entrance portion of the laminate hole 300a, The laminar members L sequentially enter the inside of the squeeze member 340 and are pressed against the squeeze member 340 in order to apply a side pressure to the laminar members L. [

The laminar members L are aligned by the squeeze member 340 so that the laminar members L are aligned by the squeeze member 340. In this embodiment, And enters the high-frequency induction heater, that is, the adhesive curing apparatus 310 via the squeeze member 340. The high- The squeeze member 340 may be made of a special steel mold such as SKD-11.

The squeeze member 340 is stacked on the lower side of the blanking die 220 so as to be coaxial with the blanking die 220. 12, the outer diameter of the lamina member L is expressed to be smaller than that of the blanking die 220. However, it is obvious in the technical field that the sizes of the lamina members L are substantially the same, The laminate member L is formed such that the laminate hole 300a is in contact with the inner circumferential surface of the laminate hole 300a while the laminate member L is in contact with the inner circumferential surface of the laminate hole 300a, To the lower side.

The squeeze member 340 supports a side surface (e.g., a rim) of the lamina members L for sequential lamination of the lamina members and prevents lamination misalignment of the lamina members L A squeeze ring having the same shape as the inner hole or blanking hole of the blanking die 220 may be used.

For example, when the laminated core shown in FIG. 8 is manufactured, the squeeze member 340 may be formed in a cylindrical shape penetrating in the vertical direction, but is not limited thereto.

As described above, the blanking unit 200 is for blanking a blank, and the laminate unit 300 is an apparatus for integrating the lamina members L, which are sequentially manufactured by blanking, And a lamination hole, that is, the laminate hole 300a described above, is integrally formed on the lower side through the laminar members L which are sequentially stacked by the blanking unit 200. [

Meanwhile, the pinch mechanism 320 assists the alignment of the product C moving downward in the adhesive hardener 310 by applying a side pressure to the product passing through the inside thereof, and prevents the product, that is, the rapid fall of the laminated core (C) do.

The pinch mechanism 320 includes a pinch block 321 and an elastic member for elastically supporting the pinch block 321, that is, a pinch spring 322. The pinch block 321 includes a pinch- Thereby preventing the laminated core (C) from dropping rapidly to the bottom of the laminate hole (300a) after passing through the adhesive hardener (310).

14, a plurality of the pinch blocks 321 are spaced apart from each other along the periphery of the laminated core C in the laminated holes 300a. For example, A plurality of units are installed in units of a predetermined angle. The pinch mechanism 320 may be a moving type or a stationary type that is fixed in place, but is preferably of the moving type in consideration of thermal expansion. In FIG. 14, when the pinch spring 322 is omitted and the pinch block 321 is fixed in place so as not to move, it is an example of a fixed type pinch.

The pinch block 321 is spaced apart from a plurality of positions along the periphery of the laminated core C and elastically supported by the pinch spring 122 or elastic member so that the laminated core C is elastically Side pressure can be applied.

The blank die 220, the squeeze member 340, the guide 330 and the pinch mechanism 320 are vertically disposed on the lower die 10 to form the laminate holes 300a, (Laminated core) C, which is discharged through a process of stacking and curing, is provided at the bottom of the stack 300a.

When the take-out receiver 500 reaches the bottom of the laminated hole (stacked barrel), a take-out cylinder (not shown) is attached to the laminated core (C) C) to the take-out passage to help take out the product.

12, a gap is formed between the laminated cores C, but actually, the lowermost lamina member of the upper-layer laminated core and the uppermost lamina member of the lower-layer laminated core are laminated in a state in which the surface adhesive force is lost, Holes 300a are sequentially passed one by one at a pitch (equal to the thickness of one lamina member) and then lowered in a state of being seated on the take-out receiver 500.

In the laminate unit 300, a high temperature is generated by the adhesive curing machine 310, and the lower die 20, the blanking die 220, and the squeeze member 340 are heated by the high temperature generated by the adhesive curing machine 310, May be thermally expanded. As a result, the shape and size of the lamina members L may be varied, and lamination failure of the lamina members L may occur.

In this embodiment, a cooling system for the laminate unit 300 is applied.

Referring to FIGS. 11 to 13, a cooling groove 341 is formed on the outer circumferential surface of the squeeze member 340. The cooling fluid flows along the cooling groove 341 to prevent the squeeze member 340 from overheating.

The cooling groove 341 is formed in a spiral shape on the outer circumferential surface of the squeeze member 340 and the upper and lower outer peripheral surfaces of the squeeze member 340 are formed at the upper and lower ends of the cooling groove 341 An annular upper groove 342 and a lower groove 343 which are connected to each other and form a closed loop are formed. It is to be understood that the cooling fluid may be air, but is not limited thereto.

The laminate unit 300 is rotatably provided in the lower mold 20 for uniformizing the thickness of the laminated core. The laminate unit 300 reduces the thickness variation of each of the laminated cores C and improves the squareness and the flatness while rotating the laminate unit 300 by a predetermined angle unit, for example, every predetermined timing.

The squeeze member 340 is fixed to the inside of the rotation housing 350 and is rotatably supported by the upper fixing block 600 fixed to the lower mold 20. [ The upper fixing block 600 is fixedly installed in the lower mold 20 and the rotation housing 350 is rotatably installed in the upper fixing block 600.

The squeeze member 340 rotates together with the rotation housing 350 and upper bearings 601 and 602 are provided inside the upper fixing block 600 to rotatably support the rotation housing 350 .

The upper fixing block 600 in this embodiment is a structure in which a plurality of bodies are laminated / assembled, but the present invention is not limited thereto. An upper flange 351 protruding outward from the rotation housing 350 is formed at an upper end of the rotation housing 350 and a lower flange 351 is formed at a lower end of the rotation housing 350. [ Is protruded to the inside of the rotation housing (350).

More specifically, the upper flange 351 is in surface contact with the bottom surface of the blanking die 220, and the lower end of the rotation housing 350 surrounds the lower end of the squeeze member 340. The squeeze member 340 is press-fitted into the rotation housing 350 and fixed.

The upper fixing block 600 includes an upper support 610 for rotatably supporting the upper half of the rotation housing 350 and a lower support 620 for rotatably supporting the lower half of the rotation housing 350. [ And an intermediate support body 630 provided between the upper support body 610 and the lower support body 620 to support the load of the upper support body 610.

In the present embodiment, the upper fixing block 600 is provided in the die holder, and the first upper bearing 601 is disposed between the inner surface of the upper support 610 and the upper outer surface of the rotation housing 350 And a second upper bearing 601 is also provided between the inner surface of the lower support 620 and the lower outer surface of the rotation housing 350.

The gap between the upper flange 351 and the upper support 610 is sealed to prevent the cooling fluid (air in this embodiment) of the squeeze member 340 from leaking.

The upper fixing block 600 is preferably provided with a cooling passage 600a. In this embodiment, the cooling passage 600a is formed in the lower support 620, and may be a water-cooled type in which the upper fixing block 600 is cooled by circulation of water, or a water-cooled type in which oil or air A cooling fluid may be used, and a cooling path may be applied to the upper support 610 and the intermediate support 630.

The upper fixing block 600 is provided with an air supply portion 640 for supplying cooling air to the cooling groove 341 of the squeeze member and an air supply portion 640 for supplying cooling air from the cooling groove 341 of the squeeze member An air discharge unit 650 is provided.

The air supply unit 640 is provided in the lower support 620 and introduces air into the lower end of the cooling groove 341 formed on the outer peripheral surface of the squeeze member 340. The air discharge unit 650 is provided in the upper support 610 to realize the exhaust in the cooling groove 341 of the squeeze member 340.

More specifically, the cooling air supplied to the lower groove 343 of the squeeze member 340 flows through the cooling groove 341 and flows into the upper groove 342 of the squeeze member, Thereby forming heat exchange with the squeeze member 340.

An air introduction groove 352 forming a closed loop is formed along the periphery of the rotation housing 350 on the lower outer circumferential surface of the rotation housing 350. An air supply hole 353 penetrating the rotation housing 350 is formed in the air introduction groove 352 so that air is introduced into the rotation housing 350. The air supply hole 353 communicates with the lower end of the cooling groove 341, more specifically, with the lower groove 343.

An air discharge groove 354 forming a closed loop is formed along the periphery of the rotation housing 350 on the outer peripheral surface of the rotation housing 350 such as the outer peripheral surface of the upper flange 351, An air discharge hole 355 penetrating the rotation housing 350 is formed in the groove 354. The air discharge hole 355 communicates with the upper end of the cooling groove 341, more specifically, the upper groove 342.

According to the present embodiment, the inner opening of the air supply hole 353 is connected to an arbitrary position of the lower groove 343 formed in the squeeze member, and the inner opening of the air discharge hole 355 is connected to the squeeze member May be connected to any position of the formed upper groove 342.

In this embodiment, the air introduction groove 352 is formed horizontally at the same height as the lower groove 343, the air discharge groove 354 is formed horizontally at the same height as the upper groove 342, The air supply hole 353 and the air discharge hole 355 horizontally penetrate the rotation housing 350.

Since the annular air introducing groove 352 and the air discharging groove 354 forming the closed loop are formed on the lower outer circumferential surface and the upper outer circumferential surface of the rotation housing 350 as described above, The air supply portion 640 and the air discharge portion 650 can be always connected to the air introduction groove 352 and the air discharge groove 354 so that introduction and discharge of air can be performed stably.

An air supply hole for guiding air from the air supply part 640 to the air introduction groove 352 is formed in the lower support body 620 and the air discharge groove 354 An exhaust hole for exhausting air to the outside is formed.

The cooling air is heat-exchanged with the blanking die 220 when the cooling air is discharged to the outside through the air discharge hole 355 from the upper outer circumferential surface of the squeeze member 340, 355 may be covered on the bottom surface of the blanking die 220. That is, the cooling air is discharged and the heat exchanging is performed by contacting the blanking die 220.

The upper fixing block 600 is provided with an oil supply portion 660 for introducing oil for lubrication and / or cooling of the upper bearings 601 and 602 into the upper bearings 601 and 602, The upper bearing 601 and the upper bearing 602 for rotatably supporting the rotation housing 350 are prevented from being damaged and the upper bearings 601 and 602 And may further perform the cooling function of the upper fixture block 600. [0052] As shown in FIG.

The pinch mechanism 360 is provided in a rotatable pinch housing 360 and rotates together with the pinch housing 360. The pinch housing 360 is rotatably supported by a lower fixed block 700). The lower fixing block 700 is fixedly installed in the lower mold 20 and the pinch housing 360 is rotatably installed in the lower fixing block 700.

In order to rotate the pinch housing 360, a lower bearing 701 for rotatably supporting the pinch housing 360 is provided on the inner side of the lower fixing block 700. The lower fixing block 700 in this embodiment is an integral body having an inner annular shape and a circumferential wall having an 'a' cross section, but the present invention is not limited thereto.

The lower fixing block 700 is provided with oil systems 710 and 720 for supplying (710) / discharging (720) lubrication and / or cooling oil to the lower bearing 701 of the lower fixing block do. The oil systems 710 and 720 of the lower fixture block 700 may also perform the cooling function of the lower fixture block 700. Of course, the lower fixing block 700 may be provided with a water-cooling or air-cooling type cooling system.

An intermediate fixing block 800 for receiving the adhesive hardener 310 is provided between the upper fixing block 600 and the lower fixing block 700. The intermediate fixing block 800 is also provided with cooling passages 800a .

In the present embodiment, the cooling passage 800a of the intermediate fixing block can be a water-cooled type in which the upper fixing block 600 is cooled by circulation of water, or another cooling fluid such as oil or air can be used . The intermediate fixing block 800 is provided with the stacking guide 330 so as to be rotatable about the rotation housing 350 and the pinch housing 360 to rotate the rotation housing 350 and the pinch housing 360. [ (360).

The lower end of the rotation housing 330 can contact the upper end of the lamination guide 330 and the pinch housing 360 can contact the lower end of the lamination guide 330. The lamination guide 330 is driven by the rotation housing 350 and / or the pinch housing 360 to rotate at the same speed.

Meanwhile, the rotation housing 350 and the pinch housing 360 simultaneously rotate at the same angle. In this embodiment, the rotation housing 350 and the pinch housing 360 are respectively provided with pulleys.

15, when the pulley 356 of the rotation housing 350 is an upper pulley and the pulley 361 of the pinch housing 360 is a lower pulley, the upper pulley 356 and the lower pulley 356, The rotation housing 361 has the same outer diameter so that the rotation housing 350 and the pinch housing 360 rotate at the same angular velocity and are connected to one drive pulley 910 by belts 911 and 912, respectively.

The drive pulley 910 is rotated by a motor M and the motor M and the drive pulley 910 are connected by a belt-pulley power transmission mechanism by a drive belt 913. However, It is of course not limited thereto.

A core manufacturing apparatus according to an embodiment of the present invention is an apparatus that can manufacture a laminated core using a strip-shaped material having an adhesive coated on its surface. For example, a core manufacturing apparatus according to an embodiment of the present invention includes a device capable of manufacturing a laminated core using a steel plate strap (self-bonding steel plate: SB steel plate) having an adhesive layer in a semi-cured state at a temperature lower than a predetermined temperature Wherein the laminate members are sequentially formed by blanking the material, forming an adhesive strength loss part for interlaminar separation on the surface of the material at predetermined intervals and intervals in interrelation with the blanking, The adhesive layer is melted by heating and then cured at a high temperature, whereby the laminated core can be manufactured.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. .

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and thus the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

C: laminated core L: lamina member
S: Material 1: Adhesive layer
2: Adhesion loss part 10:
10A: Upper pressing band 20: Lower mold
20A: Lower supporter 100: Material heating unit
111, 112: Electrode 113: Electrode support
114: elastic body 130: scraper
200: blanking unit 210: blanking punch
220: Blanking die 300: Laminate unit
310: adhesive hardener 320: pinch mechanism
330: Lamination guide 340: Squeeze member
350: Rotation housing 360: Pinch housing
400: Lift 500:
600: upper fixing block 700: lower fixing block
800: intermediate fixed block

Claims (12)

The laminated cores including laminar members integrally formed by a predetermined number of layers by interlaminar adhesion are sequentially laminated by passing a strip-shaped material having a surface coated with an adhesive layer one by one at predetermined pitches, Wherein the laminated core comprises:
A material heating unit for locally heating the material for partitioning between the laminated cores to lose the surface adhesion force at predetermined positions along the longitudinal direction of the material;
A blanking unit for sequentially forming the lamina members by blanking the material; And
And a laminate unit for sequentially manufacturing the laminated cores by integrating the lamina members,
The blanking unit comprising:
A blanking punch provided in a vertically movable upper mold for pressurization and blanking of the workpiece, the blanking punch being disposed downstream of the workpiece heating unit with respect to a conveying direction of the workpiece; And
And a blanking die supported by the lower mold provided below the upper mold and having a blanking hole facing the punch and stacked on the upper side of the laminate unit,
The material heating unit may include a resistance heater disposed upstream of the blanking unit to selectively synchronize the blanking unit to form a loss of adhesive strength on the surface of the blank each time the blanking advances a predetermined number of times Wherein the laminated core is a laminated core. The method according to claim 1,
The resistance heater includes:
And a pair of electrodes spaced apart from each other so as to resistively heat the local region of the workpiece in contact with the workpiece. 3. The method of claim 2,
The resistance heater further comprises an electrode support for supporting the pair of electrodes; Wherein the pair of electrodes are elastically supported by the electrode support in parallel with each other. 4. The method according to any one of claims 1 to 3,
Wherein the resistance heater is provided on any one of a lower supporter supporting the bottom surface of the workpiece and an upper pressing bar capable of being elevated above the lower supporter. 5. The method of claim 4,
Wherein the lower supporter is a part of the lower mold integrally with the lower mold. 5. The method of claim 4,
Wherein the upper pressurizing portion is a part of the upper mold integrated with the upper mold. 3. The method according to claim 1 or 2,
And a scraper provided upstream of the resistance heater to scrape the adhesive layer to expose a surface of the material. 8. The method of claim 7,
Wherein the scraper is provided upstream of the resistance heater based on a conveyance direction of the material. The method according to claim 1,
Wherein the upper die comprises a liftable upper frame and a plate-shaped pusher provided below the upper frame to press the material toward the lower die. The method according to claim 1,
Wherein the blanking punch is raised and lowered once by the upper mold every time the material moves by one pitch; The material heating unit is selectively synchronized with the blanking unit so as to periodically form the loss of adhesive force on the upper and lower sides of the blank at intervals of a plurality of pitches along the longitudinal direction of the blank. 11. The method of claim 10,
Wherein the blanking die is provided in the lower die at a distance of N pitch (N is a natural number equal to or larger than 1) in the workpiece heating unit along the feed direction of the work. The method according to claim 1,
Wherein the laminate unit is rotatably provided on the lower die.

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