CN1307664C - Manufacturing apparatus and manufacturing method for laminated core - Google Patents

Manufacturing apparatus and manufacturing method for laminated core Download PDF

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Publication number
CN1307664C
CN1307664C CNB02820302XA CN02820302A CN1307664C CN 1307664 C CN1307664 C CN 1307664C CN B02820302X A CNB02820302X A CN B02820302XA CN 02820302 A CN02820302 A CN 02820302A CN 1307664 C CN1307664 C CN 1307664C
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CN
China
Prior art keywords
yoke
workpiece
aforementioned
stacked
excitation
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CNB02820302XA
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Chinese (zh)
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CN1568528A (en
Inventor
佐志一道
小森优佳
河野正树
本田厚人
Original Assignee
杰富意钢铁株式会社
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Priority to JP248264/2001 priority Critical
Priority to JP2001248264 priority
Application filed by 杰富意钢铁株式会社 filed Critical 杰富意钢铁株式会社
Publication of CN1568528A publication Critical patent/CN1568528A/en
Application granted granted Critical
Publication of CN1307664C publication Critical patent/CN1307664C/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206Manufacturing of magnetic cores by mechanical means
    • H01F41/0233Manufacturing of magnetic circuits made from sheets

Abstract

A manufacturing apparatus and a manufacturing method for a laminated core which enable low-cost, short-time, and uniform thermobonding manufacture of a laminated core comprising a thermobonding type electromagnetic steel plate. A manufacturing apparatus for a laminated core having an induction coil (2) which inductively heats a work (1) comprising a laminate of electromagnetic steel plates with thermobonding insulation film by excitation in its lamination direction and a yoke (5) which presses both ends of the work in the lamination direction with first and second yoke members (5A, 5B) movable by mutual uninterference and forms a magnetic closed circuit upon pressing. A manufacturing method for a laminated core with the excitation frequency of the induction coil adjusted to 10-1000Hz, and the pressing pressure of the yoke to 0.1MPa or more for the thermowelding of the work laminated steel plate with the manufacturing apparatus.

Description

The manufacturing installation of laminate core and manufacture method

Technical field

The present invention relates to make the manufacturing installation and the manufacture method of the laminate core that is used for whirler and transformer etc.

Background technology

Be used for the laminate core of electric devices such as whirler and transformer, utilize the following operation that electromagnetic steel plate is stacked to make.Promptly, in order to reduce the eddy current after stacked, at first on electromagnetic steel plate, apply insulation (being covered) film, then, the aforementioned electromagnetic steel plate is carried out stamping-out processing or cuts off processing, make small pieces with cross sectional shape unshakable in one's determination, with the overlapping duplexer of making of aforementioned a plurality of small pieces, and then welding, rivet or utilize binding agent etc., with the manufacturing that interfixes of stacked small pieces.

But, utilize the fixing means that welds, exist the problem that edge part short circuit insulating properties unshakable in one's determination reduces, and because the problem that the magnetic characteristic that thermal strain causes worsens.In addition, utilize the fixing means of riveted joint, exist because the processing strain causes the problem that magnetic characteristic worsens.On the other hand, utilize the fixing means of binding agent, the problem that above-mentioned magnetic characteristic worsens is little, need on each steel plate, be coated with binding agent but exist, the problem of operation difference, and then, owing to be positioned on the surface of steel plate with the lower insulation tunicle of the compactness of iron plate, become the substrate layer of binding agent, so exist steel plate and the insulated substrate tunicle hypodynamic problem that is easy to peel off, bonds.

On the other hand; disclose for Te Kaiping 2-208034 number a kind of with the resin coating of vitrification point more than 60 ℃ to electromagnetic steel plate, after the drying; the shape that this steel plate is processed into regulation is stacked, is heated to about 200-300 ℃ and the method for laminate core is made in pressurization.This method, owing under the state of the big big plate of the size of steel band and plate, carry out the lining of resin, so, has the operation that to omit each steel plate (small pieces) coating binding agent, and, fixedly the time, do not allow to be subject to process the influence of strain, even under the situation with steel coil strip coiled web-like, the advantage of the so-called adhesion that plate and plate engage each other also be difficult to take place.But, under the situation of the laminate core of size big (for example φ 100mm, more than the thickness 50mm), be heated to the set point of temperature required time and grow very much (for example at least more than 60 minutes), in practicality, be difficult to realize boning.

In addition, the spy opens flat 11-187626 communique, discloses a kind of method of high-frequency dielectric heating to heating, bond at short notice as dielectric bonding tunicle of utilizing, and in the method, the size and dimension of stacked plate is not described, at 20kg/cm 2The pressure of (about 2MPa) is pressurization down, and the duplexer thick for 50mm heated 4 minutes, and the duplexer that about 25mm is thick heated 2~4 minutes approximately.But the spy opens in the flat 11-187626 communique disclosed method, exists the problem of ultra-high price of device, and owing to applied voltage must be suppressed at below the discharge voltage, so exist the very difficult problem that further shortens heating time again.In addition, also consider to utilize the method for high-frequency induction heating (frequency: several kilo hertzs~tens kilo hertzs), but existed the expensive problem of device, and be difficult to the evenly problem of heating.

On the other hand, in the Te Kaiping 7-298567 communique, disclosing a kind of one side simultaneously pressurizes the frequency induction heating of stacked steel plate with 10~100Hz, at this moment answer the technology of heating time according to the temperature sense of control before the heating of steel plate, the size of duplexer is not described, has provided and be about 11~12 minutes data heating time.But, can evenly heat although the spy opens the method described in the flat 7-298567 communique, because on its principle, the efficiency of heating surface is low, so above-mentioned example can be thought the situation of the laminate core that size is not very big.Thereby, can predict, utilize this method, under the situation of the big laminate core of size, need the heating time about 60 minutes at least, its practicality is doubt.

In addition, open in the flat 5-255645 communique the spy, with the example that is bonded as with two plates, disclosing a kind of first, second iron core with the E type docks with the form of leg section subtend, between the center leg end face, insert with the bonded member of heat-curing resin as binding agent, make the electric current that flows through commercial frequency on the induction coil that surrounds center leg, between center leg, form magnetic flux, whereby bonded member is added the technology of hot adhesion.But, because when the varied in thickness of bonded member, the supporting leg interval variation that first, second is unshakable in one's determination, be difficult to form again enough magnetic fluxs, so, many for the stacked number of picture laminate core device, under the wide situation of the thickness range of the iron core of making, be to be difficult to be suitable for.In addition, open in the flat 5-255645 communique disclosed method the spy who utilizes heat-curing resin, because the thermoplastic resin that uses is different with aforementioned techniques, not pressurization in fact, so, do not describe for pressurized conditions.

The general introduction of invention

Invent problem to be solved

The objective of the invention is, even provide a kind of under the very big situation of core dimensions, manufacturing installation laminate core, laminate core and the manufacture method of the electromagnetic steel plate that also can add hot adhesion manufacturing use coating thermoplastic resin at an easy rate, at short notice equably and be dried (having the electromagnetic steel plate that adds heat-sticking type insulation tunicle).

Solve the scheme of problem

People such as present inventor are in order to reach aforementioned purpose, result through further investigation, find, utilization has the workpiece of the duplexer formation of the electromagnetic steel plate that adds heat-sticking type insulation tunicle, utilize induction coil with appropriate frequency one side excitation one side this workpiece to be pressurizeed along the workpiece stacked direction, and the yoke that constitutes by the mode that utilize to constitute the magnetic closed-loop path, along the workpiece stacked direction with appropriate exert pressure, even under the big situation of workpiece, also can add thermo-compressed expeditiously at short notice equably, thereby finish the present invention.

That is, the present invention is a kind of manufacturing installation and method of laminate core as described below.

(1) a kind of laminate core manufacturing installation, it is characterized in that, it comprises: with the stacked induction coil that has the workpiece of the electromagnetic steel plate formation that adds heat-sticking type insulation tunicle along its stacked direction excitation induction heating, and, compress two ends of the stacked direction of said workpiece with first, second yoke member that can relatively move without interfering with each other mutually, and when carrying out this compressing, form the yoke of magnetic closed-loop path along the stacked direction (being compaction direction) of workpiece.

Here, preferably, said workpiece has along the through hole of stacked direction or groove, and has aforementioned apertures or the interior iron core of groove that inserts said workpiece.In addition, preferably, aforementioned means has the insulation board by the nonmetallic materials formation of heat-resisting, withstand voltage (anti-bending) between said workpiece and aforementioned each yoke member, and the aforementioned dielectric plate has the following pyroconductivity of 1.0W/mK.And then preferably, aforementioned means has the guide of the skew that prevents plywood.

In addition, preferably, the magnetic closed-loop path is made of aforementioned first and second yoke member, but also can further adopt other yoke member (auxiliary yoke element), utilizes a plurality of yoke members to constitute the magnetic closed-loop path.

(2) a kind of manufacture method of laminate core, it is characterized in that, utilize the manufacturing installation of the laminate core described in (1), in the process of the stacked steel plate that adds the thermo-compressed said workpiece, the excitation frequency that makes aforementioned induction coil is 10~1000Hz, and the thrust that makes aforementioned yoke (yoke) is more than 0.1MPa.

(3) as the manufacture method of (2) described laminate core, it is characterized in that, so that magnetic flux density is set aforementioned excitation frequency and aforementioned compaction pressure in the mode of component more than 0.2T of stacked direction in the workpiece.

In above-mentioned (2) and (3) described manufacture method, preferably, aforementioned yoke is paid the compaction pressure (goal pressure that is used to bond) of regulation, then, said workpiece is carried out induction heating by excitation, perhaps, aforementioned yoke is applied to a certain degree compaction pressure, this compaction pressure can prevent the skew that the vibration of the aforementioned electromagnetic steel plate that causes because of excitation causes, then, said workpiece is carried out induction heating by excitation, then, apply the thrust (goal pressure that is used to bond) of regulation to aforementioned yoke.

The simple declaration of accompanying drawing

Figure 1A, be the profile of example of expression device of the present invention.

Figure 1B, be the profile of another one example of expression device of the present invention.

Fig. 1 C, be the profile of further another one example of expression device of the present invention.

Fig. 1 D, be the profile of further another one example of expression device of the present invention.

Fig. 1 E, be the profile of further another one example of expression device of the present invention.

Fig. 1 F, be the profile of further another one example of expression device of the present invention.

Fig. 2 A, be the stereogram of expression for stacked electromagnetic steel plate, the laminate core excitation direction when using usually.

Fig. 2 B, be that expression is for stacked electromagnetic steel plate, carry out the stereogram of the excitation direction of workpiece when handling in the present invention.

Fig. 3, be the stereogram of suitable example of expression yoke.

Fig. 4 A, be the profile of example that expression utilizes the device of the present invention of the core iron heart.

Fig. 4 B, be the stereogram of the suitable example of the expression core iron heart.

Fig. 4 C, be the stereogram of the other suitable example of the expression core iron heart.

Fig. 5 A, be the profile around the workpiece of example of the expression device of the present invention that utilizes guide.

Fig. 5 B, be the plane graph around the workpiece of presentation graphs 5A.

Fig. 5 C, be the plane graph (unloading the state of lower insulation plate) of an example of the shape of the expression guide that is used for Fig. 5 A.

Fig. 5 D, be the plane graph (unloading the state of lower insulation plate) of another one example of the shape of the expression guide that is used for Fig. 5 A.

Fig. 5 E, be the plane graph (unloading the state of lower insulation plate) of further another one example of the shape of the expression guide that is used for Fig. 5 A.

Fig. 5 F, be the plane graph (unloading the state of lower insulation plate) of further another one example of the shape of the expression guide that is used for Fig. 5 A.

Fig. 6 A, be the profile around the workpiece of another one example of the expression device of the present invention that uses guide.

Fig. 6 B, be the plane graph around the workpiece of example of presentation graphs 6A.

Fig. 6 C, be the plane graph (unloading the state of lower insulation plate) of an example of the shape of the expression guide that is used for Fig. 6 A.

Fig. 6 D, be the plane graph (unloading the state of lower insulation plate) of another one example of the shape of the expression guide that is used for Fig. 6 A.

Fig. 6 E, be the plane graph (unloading the state of lower insulation plate) of another one example of the shape of the expression guide that is used for Fig. 6 A.

The optimised form that carries out an invention

Manufacturing installation (device of the present invention) according to laminate core of the present invention, for example, shown in figure Figure 1A to Fig. 1 C, comprising: the workpiece 1 that will have a stacked formation of electromagnetic steel plate that adds heat-sticking type insulation tunicle is along its stacked direction excitation and carry out the induction coil 2 of induction heating; And, with can along the stacked direction of workpiece 1, promptly the above-below direction of figure relatively move without interfering with each other mutually ground first, second yoke member 5A, 5B workpiece pressing 1 stacked direction two ends, in the yoke 5 of carrying out forming when this compresses the magnetic closed-loop path.Induction coil 2 is powered by AC power 3 (being shown in Fig. 3).Yoke 5 is pushed by forcing press 4, workpiece 1 compressed, because as long as yoke member 5A and 5B can relatively move mutually, so, also a yoke member can be fixed, only another yoke member is moved with forcing press 4 grades.The insulation board 6 that workpiece 1 and yoke 5 usefulness are heat-resisting, withstand voltage (for example with formations such as glass fabrics) carries out electric insulation.

As the workpiece that is heated, is crimped material, will have the stacked not crimped status that intactly remains on of electromagnetic steel plate (electric iron plate) that adds heat-sticking type insulation tunicle.Stacked electromagnetic steel plate can use common commercial goods, can not have directivity, one-way and amphitropic, and its chemical composition, thickness of slab etc. do not have specific restriction.Preferably, the characteristic value of electromagnetic steel plate, under the situation of directive electromagnetic steel plate, iron loss W 17/50(frequency 50Hz, the value during peakflux density 1.7T) is about 0.5~2.0W/kg, magnetic flux density B 8(value during magnetizing force 800A/m) is about 1.7~2.0T, under the situation of the electromagnetic steel plate that does not have directivity, and iron loss W 15/50(frequency 50Hz, the value during peakflux density 1.5T) is about 2.0~12.0W/kg, magnetic flux density B 50(value during magnetizing force 5000A/m) is about 1.6~1.9T.

In addition, the present invention, be applicable to the workpiece of thickness of slab in common thickness (about 0.05-1.0mm) scope of electromagnetic steel plate, particularly, carry out stacked workpiece, by adopting the present invention for the electromagnetic steel plate below the 0.5mm that utilizes welding, riveted joint to be difficult to fix, can obtain greatly to reduce the effect of its difficulty, thereby in this case, it is very good adopting method of the present invention.

Usually, when using laminate core, along direction (direction that the is parallel to the steel plate face) excitation of the layer of stacked electromagnetic steel plate, in the process of the induction heating that carries out for the manufacturing of carrying out laminate core, equally along the direction excitation (Fig. 2 A) of layer.In order to reduce the energy loss when iron core uses that the eddy current that utilizes this excitation to produce causes, the electromagnetic steel plate that the laminate core that adopts thickness ratio to approach is used.Be accompanied by the high performance of laminate core, thickness of slab has the tendency of further attenuate, and consequently, when making laminate core, in the common induction heating mode of the direction excitation of layer, the efficiency of heating surface can reduce.Simultaneously, in order to improve the efficiency of heating surface, need further to improve frequency, heating has the tendency of the difficulty of becoming.

Relative therewith, in the present invention, unthink, not with stacked steel plate excitation (Fig. 2 B) along the direction of layer but along stacked direction (perpendicular to the direction of steel plate face).Be used for along stacked direction direction excitation,, increase the efficiency of heating surface, so, also can utilize cheap low frequency fully to heat expeditiously no matter how thin thickness of slab become so enlarge the generation area of eddy current.

In addition, ideally, excitation direction is parallel with stacked direction, but because the error when being provided with of the manufacturing of stacked laminator and plywood, and in fact is difficult to strict parallel.Therefore, for the condition in order in spreading all over the whole zone of stacked direction, fully to heat in fact, study.According to this result of study, excitation direction is preferred with respect to the deviation angle of stacked direction in 5 degree the time.

Induction coil 2 can be positioned on any position of magnetic closed-loop path, but shown in Figure 1A, from the viewpoint of the efficiency of heating surface and thermal uniformity, preferably, the stacked direction of workpiece 1 can be contained in workpiece 1 in the coil hole along the axial direction of coil.

As other form, shown in Fig. 1 F, the part of yoke can be contained in the coil hole.In this form, has the complicated advantage of installation procedure that can not make workpiece.

Yoke 5, constitute by the first yoke workpiece 5A and the second yoke workpiece 5B, in them any one or they both, mutually can be intrusively, not promptly, yoke member (in opereating specification) each other can not move with hindering mutually, from the two ends of stacked direction workpiece 1 compressed, so, for the different various workpiece of thickness, can pay the stacked steel plate of this workpiece pressure of the necessary enough stacked direction of crimping each other.

In addition,, constitute in the mode that under the state of workpiece pressing 1, forms the magnetic closed-loop path owing to yoke 5, so, on workpiece 1, can pass through enough magnetic fluxs, pass through the efficiency of heating surface.

For the first yoke member 5A is moved mutually without interfering with each other with the second yoke member 5B, and when Work-sheet pressing, form the magnetic closed-loop path, for example, shown in Figure 1A to Fig. 1 C, can make and make the structure that to dock slidably each other along the end face of the moving direction of first, second yoke workpiece 5A, 5B.

Here, in order to form stable very strong magnetic closed-loop path, the clearance G of the docking section of two yoke workpiece is preferably smaller, preferably, and below 5.0mm.In addition, the docking section area, preferably big as much as possible, preferably, can guarantee to surpass the area of section of the yoke that forms magnetic circuit.

In Figure 1A~Fig. 1 C, with make a yoke member (among the figure shown in figure A and Fig. 1 C, second yoke member 5B) the outstanding structure of end face part is compared, shown in Figure 1B, make the butt end face portion that to slide of first, second yoke workpiece give prominence to respectively, guarantee that the structure of area of butted part is more preferred.Its reason is that in the structure that the end face part that makes two yoke members is given prominence to, aforementioned magnetic closed-loop path is not easy to be subjected to because the influence of the change of the compacted position of the yoke workpiece that the change of thickness of workpiece causes.

In addition, shown in Figure 1A, two ends that make a yoke member to the substantially parallel outstanding structure of direction of compaction direction, in the yoke of symmetric figure, can be with the yoke miniaturization.

In addition, the structure of Fig. 1 C, having can be with the advantage of press device (forcing press 4) miniaturization.

In Fig. 1 D to Fig. 1 F, the form of further another yoke among expression the present invention.

Fig. 1 D is a kind of as with joint 52 grades the docking section 51 of yoke side is combined with arbitrarily angled with the main body 53 of yoke member, at least can be from mobile example the position of retreating position (for example 51 ') during to use.This structure, when the installation of workpiece, yoke can not produce interference, and, can make the gap minimum between the yoke member of docking section.

Fig. 1 E is a kind of except that yoke member 5A, 5B up and down, also adopts the example that forms the auxiliary yoke member 5C that uses the magnetic closed-loop path.That is, auxiliary yoke member 5C can move (mobile device is not shown among the figure) between the position 5C when retreating position (for example, 5C ') and use, and its result can obtain the advantage the same with Fig. 1 D.

In addition, Fig. 1 F is 3 supporting legs (workpiece 1 is equivalent to a supporting leg) without usefulness such as Figure 1A, but with the example that two supporting legs constitute, is asymmetric shape, for not being very sensitive workpiece to uniformity, and use that can be without a doubt.In the example of Fig. 1 F, it is minimum that device size becomes.In addition, in Fig. 1 F, the hole portion with induction coil 2 of having represented holds the example that the mode of yoke is provided with, but as shown in Figure 1A waits, also can be provided with in the mode of holding workpiece.

The shapes of yoke etc. need not be confined to above-described example, for example, and can be with the counter-rotating up and down of disclosed example, and, also disclosed example can be used for mutual combination, so that make the left and right sides form of yoke member asymmetric.

In addition, from the viewpoint as the structural elements of magnetic loop, preferably, yoke is by the little material of iron loss, that is, directivity will be arranged or do not have the electromagnetic steel plate of directivity stacked, formation interfixes.The electromagnetic steel plate that is used for yoke, it is more preferred that thickness of slab approaches.In addition, at this moment, this electromagnetic steel plate is preferably stacked along the direction (direction of plate thickness in this example) of its easy excitation.At this moment, for example, as shown in Figure 3, yoke 5 preferably, is parallel to the mode of carrying out the direction of excitation by induction coil 2 as much as possible with the direction along layer of the stacked electromagnetic steel plate that constitutes this yoke and carries out assembled configuration.Whereby, the sensed heating of yoke can be suppressed as much as possible, the waste and because the damage that the excessive intensification of yoke causes of electric power can be avoided.

Insulating element 6 utilizes non-metal insulating material.But, insulating element 6 also has workpiece and yoke electric insulation except that the function of the pressing plate with workpiece, and the induction heating that makes workpiece is the function of stabilisation equably, and play and prevent that heat runs off guarantee even heating in the workpiece from workpiece, and even guarantee the inhomogeneity effect that bonds.Thereby, as the raw material of insulating element 6, preferably, have outside the insulating properties, when also having thermal endurance, the resistance to pressure (particularly anti-bending) of anti-heating, anti-pressurization, it is high that its heat-proof quality is also wanted.According to service condition, preferably, heat resisting temperature is about 200~800 ℃, as resistance to pressure, under the described in front temperature, can bear the pressure about 0.5~300MPa.In addition, preferably, have the thermal insulation of pyroconductivity below 1.0W/mK.

From above-mentioned characteristic requirement, raw material as the heat insulating member material, be preferably nonmetallic insulating material, particularly suitable is with glass fibre or glass fabric (fabric of glass fibre) is principal component, with the raw material of heat-resistant resins such as silicones as binding agent.As this raw material, for example, can list Rosner plate (glass fabric system; About pyroconductivity 0.24W/mK).

In addition, fluorine resin and silicones, generally its thermal endurance and thermal insulation all are good (heat conduction are below 1.0W/mK).For example, open in the flat 11-187626 communique, disclose, the Teflon  of used thickness 5mm (teflon: the example of the Teflon  plate of sheet or thickness 10mm polytetrafluoroethylene) as insulating material aforementioned spy.But, because these resin compressive strengths, buckling strength are low, so, using as monomer even be made into sheet, its effect is also poor than above-mentioned resistance to pressure raw material, is unsettled.

On the other hand because corresponding to the electromagnetic steel plate of the top and bottom of workpiece also coating thermoplastic resin usually, by heating and pressurizing with insulator and workpiece bonding, after processing, the operation that it need be peeled off mostly.In this case, because the stripping performance excellence of Teflon , so as the superficial layer of insulating element 6, preferably using fluorine resin and silicon is resin.Promptly, aforementioned resin is surface-coated to the insulation board of above-mentioned glass fibre or glass fabric system, perhaps, as the above-mentioned sheet surface layer of stating the insulation board of glass fibre or glass fabric system, it is effective using the resin monomer sheet of Teflon  sheet and silicone resin sheet etc.

In addition, preferably, the thickness of insulation board is more than the 0.5mm, below the 20mm, more preferably, and more than the 1.0mm, below the 10.0mm.

In addition, for example, shown in Fig. 4 A, with respect to the workpiece 1 of the centre bore that has perforation at stacked direction, when being inserted into the core iron heart 7 in this centre bore, producing the rectification effect of magnetic flux, can carry out excitation more uniformly, is preferred therefore.Replacing centre bore, up to having along stacked direction near the center under the situation of through slot, when the core iron heart 7 is inserted this groove, is effective equally.

The generation type of the core iron heart 7 is, shown in Fig. 4 B or Fig. 4 C, the same with yoke 5, preferably, directivity will be arranged or do not have the electromagnetic steel plate of directivity stacked along the direction of its easy excitation, make its along the direction of layer as much as possible in the excitation direction that induction coil 2 is arranged mode abreast, form with interfixing.Here, Fig. 4 B is that its flat shape is an orthohexagonal example roughly, Fig. 4 C be that its flat shape is roughly criss-cross example, but its flat shape is not limited thereto, but from guaranteeing inhomogeneity viewpoint, the shape with a plurality of line symmetry axis is preferred.

In addition, yoke 5 or, and then, the core iron heart 7, in order to prevent because the excessive heat that causes of excitation repeatedly can be made the structure that can carry out water-cooled.

In addition,, perhaps prevent its offset, guide 8 can be set for aligned in position with stacked electromagnetic steel plate.Fig. 5 A, Fig. 5 B, Fig. 6 A and Fig. 6 B with the profile and the plane graph of yoke and periphery thereof, have enumerated the guide example.

Guide 8 shown in Fig. 5 A and Fig. 5 B, be roughly cylindric, be wait in a kind of aforementioned centre bore that inserts workpiece, in be connected to workpiece, from the inboard to its structure that supports.In addition, shown in Fig. 5 A and Fig. 5 B, under the situation of utilizing the core iron heart 7 (the example here is that its flat shape is a cross shape roughly), guide is external in the core iron heart 7, can be unshakable in one's determination from outside supporting.Preferably, shape unshakable in one's determination be can in be connected to the shape of guide, but its shape is arbitrarily, and is self-evident in addition, also can omit the core iron heart 7.

Fig. 5 C~Fig. 5 F is plane graph modification, that do not express insulating material among the figure of the flat shape of the guide 8 shown in expression above-mentioned Fig. 5 A and Fig. 5 B.Fig. 5 C is the example of the guide of simple general cylindrical shape, in the drawings, connects in the tooth portion 10 (back description) of guide 8 and workpiece 1, carries out the location of workpiece 1.

Fig. 5 D is the example that has a protuberance (key 9) in the columnar outside, has at centre hole side when workpiece under the situation of shape of a plurality of protuberances (tooth portion (teeth) 10), and is effective especially.That is, when the position of workpiece 1 is directed to the cylindrical portion location of part as previously described, key 9 is inserted between workpiece 1 and the tooth portion (teeth) 10, carries out the location of tooth portion, prevent skew.Fig. 5 E is the shape with a plurality of keys 9, can more effectively reach aforementioned effect.

Fig. 5 F has the structure of long key 9 at 6 positions, is connected to workpiece in the top with key, carries out the location of workpiece 1 and tooth portion 10 thereof, prevents skew.Under the situation of the location of carrying out workpiece with key 9, preferably, guide 8 is made minimum structure with key of two groups of subtends.

Guide 8 shown in Fig. 6 A and Fig. 6 B also is a cylindrical shape roughly, is external in workpiece, from the outside it is supported.In this example, also can omit the core iron heart 7 (for example, its flat shape is a circle roughly), in addition, the shape of the core iron heart 7 is arbitrarily.

Fig. 6 C~Fig. 6 E is plane graph modification, that insulating material is not shown among the figure of the flat shape of the guide 8 shown in expression above-mentioned Fig. 6 A and Fig. 6 B.Fig. 6 C is the example of the guide of simple general cylindrical shape, with being connected to workpiece 1 in the cylinder inner wall portion, carries out the location of workpiece 1.Fig. 6 D is the example that cylindrical inside has 3 protuberances (key 9), is external in workpiece 1 with key 9, utilizes 3 supportings to carry out the location of workpiece 1.Fig. 6 E is the shape with more a plurality of (being 6 in the drawings) key 9, can more stably carry out the location of workpiece 1.

In addition, these guides for the ease of dismounting, can be divided into them plural workpiece.

Guide shown in Fig. 5 A~Fig. 6 E, because all guide height all are designed to its upper end between the upper surface and lower surface of upside insulation board, so, can lead to whole plywoods, when workpiece pressurizes, can not be under pressure, thereby, when workpiece pressurizes, there is no need to keep out of the way.

Obviously, as long as no problem in practicality, also can adopt the guide of the part of the part that only supports stacked direction or flat shape.In addition, even with yoke the guide that disturbs takes place in when pressurization, as long as the structure of keeping out of the way when pressurization, perhaps employing can tolerate the strain raw material of pressurization, just can use.

As the raw material of guide 8, preferably, use to have stable on heating raw material, that is, can use glass fibre, glass fibre fabric swatch, silicones, engineering plastics such as fluorine resin, heat-curing resins such as phenolic resins, and their compound.In addition, in the structure of haveing no alternative but to select also guide is exerted pressure when workpiece pressurizeed, and when pressurization, can not make under the situation that guide keeps out of the way, preferably, use has thermal endurance and flexible raw material, that is, silicon is the raw material as guide such as rubber.

Secondly, describe for requirement and optimum condition in the method (method of the present invention) of this manufacturing laminate core that utilizes the invention described above.

At first, workpiece is installed on the device of the present invention.At this moment, the order of workpiece (the stacked electromagnetic steel plate of using), the core iron heart (under situation about using), guide (under situation about using) being installed successively, according to circumstances, is a kind of order that is easy to install.

As suitable method, have and prepare one and be installed to workpiece (the stacked electromagnetic steel plate of using) on the guide and the core iron heart and be installed to method on the device together.In this case, as the operation after heating, the pressurized treatments end, preferably, at first, workpiece (the stacked electromagnetic steel plate of using) and guide that bonding is good take out together, after its cooling, workpiece are separated from guide.

In addition, usually, the viewpoint from field-strip is oversimplified preferably, is fixed to the core iron heart on yoke member 5A and the 5B.

In the method for the invention, utilize the frequency of induction coil excitation, be necessary at about 10~about 1000Hz.When not enough 10Hz, can not fully heat.On the other hand, when surpassing about 1000Hz,,,, need the long time of cost perhaps in order to obtain to reach the even heating of sufficient bonding so it is insufficient to bond owing to can not evenly heat.Wherein, owing to about 50Hz and about 60Hz, be the frequency that to use inverter equifrequent converter just can obtain simply, so be suitable frequency as commercial frequency.

In addition, that utilizes that yoke carries out compresses (pressurization) pressure, is necessary more than 0.1 MPa.When the about 0.1MPa of deficiency, not only can not obtain enough cohesive forces but also because the danger that the vibration that excitation causes has the stacked steel plate of making to be offset.

In addition, when compaction pressure surpasses 300MPa, because steel plate has the danger of buckling, so, preferably, about 0.1~about 300MPa.In addition, from the more stable viewpoint of cohesive force, more preferably, about 0.5~about 50MPa.In addition, it is suitable pressurizeing more than duration in about 10 seconds.

In addition, from the viewpoint of time of shortening the bonding operation, aforementioned excitation frequency and aforementioned compaction pressure, preferably, so that magnetic flux density is set in the mode of setting out more than about 0.2T of stacked direction in the workpiece.

In addition, as the step of pressurization and induction heating, can be after being pressurized to goal pressure, beginning excitation (induction heating).In addition, also can not cause that with the excitation vibration pressure (about about 0.1~about 0.5MPa) of skew pressurizes at the initial stage of heating, (beginning about 60~about about 600 seconds in heating usually) is pressurized to goal pressure after heating fully.

The heating-up temperature of workpiece as carrying out usually, preferably is set in the vitrification point that adds heat-sticking type insulation tunicle or more than the softening temperature, and in the scope below heat decomposition temperature (humidity province that can add hot adhesion).As long as be no more than heat decomposition temperature, be heated than above-mentioned vitrification point or softening temperature high approximately 50 ℃~150 ℃ temperature, be particularly preferably.

As the temperature control model of workpiece, can be only to be warmed up to the temperature province that can add hot adhesion, also can be to heat up earlier and then carry out temperature to keep.

Be applied to as the thermoplastic resin on the electromagnetic steel plate of workpiece, promptly, relevant with the workpiece heat-sticking type insulation tunicle that adds is with resin (the present invention's resin), there is not specific restriction, but preferably use acrylic acid series, epoxy system, phenolic aldehyde system, silicon system etc. demonstrates plasticity by heating, the resin that tunicle fuses each other.In addition, also can utilize the mixture of two or more adhesion resins, and then also can comprise without detriment to the amine of the degree of effect of the present invention is additives such as curing agent agent silicon dioxide.

When vitrification point of the present invention or softening temperature are high, can obtain good adhesion strength, even and during the electromagnetic steel plate steel coil strip coiled web-like after will being coated with this resin, also can further suppress steel plate adhesion each other.Specifically, described in front viewpoint is set out, and the glass turnover alternating temperature degree of the resin that the present invention uses and softening temperature are preferably more than 60 ℃.

On the other hand, for fear of the load that unnecessarily increases induction heating, preferably, the present invention with the vitrification point of resin or softening temperature about below 250 ℃.

In addition, in order further to improve the performance of tunicle, can in the resin that the present invention uses, cooperate additives such as rust inhibitor.In this case, from guaranteeing the viewpoint of the performance after the stress relief annealing, preferably, with respect to the organic substance of 100 parts of weight portions, the total amount of inorganic substances is about in the scope of 3~about 300 parts of weight portions.

The thickness of thermoplastic resin that constitutes each stacked electromagnetic steel plate surface of workpiece does not have specific limited, but preferably about about 0.05~about 25 μ m, more preferably is about 0.1~about 10 μ m.At the thickness of this film, have enough interface resistances, can bring into play enough adhesion strengths for the bonding of being undertaken by heating, pressurization.

Stacked having adds the electromagnetic steel plate of heat-sticking type insulation tunicle as workpiece, for example, utilizes operation manufacturing described below.That is, the water system binding type resin with emulsion state, dispersity etc. utilizes roll coater, the cast-type coating machine, the spraying coating, the whole bag of tricks such as blade coating machine are applied on the electromagnetic steel plate, utilize normally used hot air type, infrared-type, induction heating type etc. carry out baking processing.These operations also can be carried out being cut into tabular processed material (electromagnetic steel plate), but utilize coil coating to handle the method for electromagnetism steel band, and the production efficiency height is more practical.

The size of workpiece does not have specific restriction, but for short time heating difficulty in the prior art, area of section is about 1,000~about 100,000mm 2, the large-scale workpiece particularly suitable about the about 5~about 500mm of thickness.

Embodiment

Embodiment 1

To be coated with baking acrylic resin (component: acrylic resin 85%, epoxy resin 15%, 70 ℃ of softening temperatures) electric iron plate (electromagnetic steel plate) stamping-out that adds the having of thickness of slab 0.5mm heat-sticking type insulation tunicle becomes the ring-type of external diameter 100mm, internal diameter 50mm, the workpiece of stacked 100 formations, be encased in the device of the present invention of form shown in Figure 1A, excitation and pressurization under the various conditions shown in the table 1, carry out the electric iron plate in the workpiece is added each other the laminate core manufacturing test of hot adhesion, research heating time and bond state.

In addition, as insulation board 6, (daylight changes into Co., Ltd.'s system to the Rosner plate of employing diameter 110mm, thickness of slab 5mm; Pyroconductivity: 0.24W/mK), in addition,, adopt the guide (raw material: silicones) of the shape shown in Fig. 5 A~Fig. 5 C as guide 8.In addition, under the situation of the not enough 1.0MPa of pressurized conditions, after being pressurized to the pressure of regulation, the beginning induction heating, at pressurized conditions under the situation more than the 1.0MPa, after being pressurized to 0.2MPa, the beginning induction heating after heating began for 120 seconds, is pressurized to the pressure of regulation.In addition, at No.10 and No.11, pressurization yoke that need not formation difference magnetic of the present invention closed-loop path is directly pressurizeed with forcing press.

Here, use to arrive 200 ℃ of required times by the temperature of the thermocouple measurement that is installed to side surface of workpiece from room temperature and estimate heating time, will also not reach 200 ℃ situation through 1 hour, as " not reaching ".Bond state, the laminate core that will add behind the hot adhesion is forcibly peeled off, and will peel off required load and be divided into 4 grades, simultaneously,, judges in the following manner owing to peel off the state of the adhesive surface that exposes by visualization.

◎: peel load=big, not adhesive segment=do not have basically (not bond area rate less than 30%)

Zero: peel load=in,, adhesive segment=exist on a small quantity (not bond area rate more than 30%, less than 60%) not

△: peel load=little,, adhesive segment=exist (not bond area rate more than 60%, less than 90%) not moderately

*: peel load=atomic little, not adhesive segment=exist in a large number (the bond area rate is not more than 90%)

The results are shown in table 1.

Table 1

?No. Excitation direction Have or not the pressurization yoke Magnetic flux T Excitation frequency Hz Moulding pressure MPa Heating time min Adhering state Remarks ?1 Stacked direction Have ??1.0 ???5 ??1.0 Do not reach ??× Comparative example ?2 Stacked direction Have ??1.0 ???10 ??1.0 ????50 ??◎ Embodiment ?3 Stacked direction Have ??1.0 ???20 ??1.0 ????15 ??◎ Embodiment ?4 Stacked direction Have ??1.0 ???30 ??1.0 ????6 ??◎ Embodiment ?5 Stacked direction Have ??1.0 ???40 ??1.0 ????4 ??◎ Embodiment ?6 Stacked direction Have ??1.0 ???50 ??1.0 ????3 ??◎ Embodiment ?7 Stacked direction Have ??1.0 ???60 ??1.0 ????2 ??◎ Embodiment ?8 Stacked direction Have ??0.5 ???100 ??1.0 ????2 ??◎ Embodiment ?9 Stacked direction Have ??0.2 ???1000 ??1.0 ????2 ??○ Embodiment ?10 Stacked direction Do not have ??0.1 ???50 ??1.0 Can not excitation ??× Comparative example ?11 Stacked direction Do not have ??0.1 ???60 ??1.0 Can not excitation ??× Comparative example ?12 Stacked direction Have ??0.1 ???10000 ??1.0 ????1 ??× Comparative example ?13 Direction along layer Have ??1.0 ????50 ??1.0 Do not reach ??× Comparative example ?14 Direction along layer Have ??1.0 ????60 ??1.0 Do not reach ??× Comparative example ?15 Stacked direction Have ??0.1 ????50 ??1.0 Reach ??○※ Embodiment ?16 Stacked direction Have ??0.2 ????50 ??1.0 ????50 ??◎ Embodiment ?17 Stacked direction Have ??0.3 ????50 ??1.0 ????22 ??◎ Embodiment ?18 Stacked direction Have ??0.4 ????50 ??1.0 ????12 ??◎ Embodiment ?19 Stacked direction Have ??0.5 ????50 ??1.0 ????8 ??◎ Embodiment ?20 Stacked direction Have ??0.7 ????50 ??1.0 ????4 ??◎ Embodiment ?21 Stacked direction Have ??1.5 ????50 ??1.0 ????2 ??◎ Embodiment ?22 Stacked direction Have ??1.0 ????50 ??10.0 ????3 ??◎ Embodiment ?23 Stacked direction Have ??1.0 ????50 ??0.5 ????3 ??◎ Embodiment ?24 Stacked direction Have ??1.0 ????50 ??0.3 ????3 ??◎ Embodiment ?25 Stacked direction Have ??1.0 ????50 ??0.2 ????3 ??○ Embodiment ?26 Stacked direction Have ??1.0 ????50 ??0.10 ????3 ??○ Embodiment ?27 Stacked direction Have ??1.0 ????50 ??0.04 ????3 ??△ Comparative example ?28 Stacked direction Have ??1.0 ????50 ??0.01 ????3 ??× Comparative example

※ is bonding securely more than 1 hour by heating.

As the table shows, in the embodiment consistent, obtain firm bond state of ◎~zero with method of the present invention, and then, in the embodiment that satisfies the appropriate condition of magnetic flux more than 0.2T, in the heating time of 2~50 minutes weak points, obtain firm bond state of ◎~zero.

In addition, particularly, excitation frequency more than the 20Hz and magnetic flux under the condition more than the 0.3T, with the heating time below 30 minutes, excitation frequency more than the 20Hz and magnetic flux under the condition more than the 0.4T, with the shorter heating time below 20 minutes, excitation frequency more than the 20Hz and magnetic flux under the condition more than the 0.5T, with below 10 minutes and shorter heating time, just can obtain good bonding, and then, excitation frequency more than the 40Hz and magnetic flux under the condition more than the 0.7T, can be with below 4 minutes, excitation frequency more than the 50Hz and magnetic flux under the condition more than the 1.0T, can be with below 3 minutes, extremely Duan time just can be good at bonding.

Embodiment 2

Will the workpiece the same with embodiment 1, in the device of the present invention of the form shown in Figure 1B of packing into, carry out excitation and pressurization with the various conditions shown in the table 2, carry out the electric iron plate in the workpiece is added each other the laminate core manufacturing test of hot adhesion, in research heating time and bond state, utilization and embodiment 1 same method are judged bond state.In addition, insulation board 6 and guide 8 except that the example of special record, use the parts identical with embodiment 1.In addition, as the core iron heart, adopt the shape (material 33mm * 100mm that width is wide, 40 of the stacked numbers that the electromagnetic steel plate of thickness 0.5mm are laminated into Fig. 4 C; Material 20mm * 100mm that width is narrow, each 13 of stacked number front and back) fixing iron core, be inserted in the centre bore of said workpiece along the direction shown in Fig. 4 A and Fig. 4 C.

The results are shown in table 2.

Table 2

??No. Excitation direction Have or not the core iron heart Magnetic flux T Excitation frequency Hz Moulding pressure MPa Heating time min Adhering state Remarks ??29 Stacked direction Do not have 0.2 ????50 ????1.0 45 ??◎ Embodiment ??30 Stacked direction Have 0.2 ????50 ????1.0 20 ??◎ Embodiment ??31 Stacked direction Do not have 0.4 ????50 ????1.0 11 ??◎ Embodiment ??32 Stacked direction Have 0.4 ????50 ????1.0 7 ??◎ Embodiment ??33 Stacked direction Do not have 0.5 ????50 ????1.0 3 ??◎ Embodiment ??33 Stacked direction Have 0.5 ????50 ????1.0 2 ??◎ Embodiment ??34 Stacked direction Do not have 1.0 ????50 ????1.0 3 ??◎ Embodiment ??35 Stacked direction Have 1.0 ????50 ????1.0 1.5 ??◎ Embodiment ??36 Stacked direction Do not have 1.0 ????50 ????0.5 3 ??◎ Embodiment ??37 Stacked direction 1.0 ????50 ????0.5 1.5 ??◎ Embodiment ??38 Stacked direction Do not have 0.5 ????100 ????1.0 2 ??◎ Embodiment ??39 Stacked direction Have 0.5 ????100 ????1.0 1 ??◎ Embodiment ??40*1 Stacked direction Do not have 1.0 ????50 ????1.0 4 ??○ Embodiment ??41*2 Stacked direction Do not have 1.0 ????50 ????1.0 3.5 ??◎ Embodiment ??42*3 Stacked direction Do not have 1.0 ????50 ????1.0 10 ??○ Embodiment ??43*4 Stacked direction Do not have 1.0 ????50 ????1.0 8 ??○ Embodiment ??44*5 Stacked direction Do not have 1.0 ????50 ????1.0 3 ??◎ Embodiment ??45*5 Stacked direction Have 1.0 ????50 ????1.0 1.5 ??◎ Embodiment

* 1: no guide

* 2: the guide that uses Fig. 6 A-Fig. 6 C record

* 3: the granite slab (pyroconductivity 1.6W/mK) that uses thickness of slab 5mm as insulator

* 4: the Teflon  sheet (pyroconductivity 0.3W/mK) that uses thickness of slab 5mm as insulator

* 5: as insulator, use the Rosner plate of thickness of slab 4 mm of pasting the Teflon  sheet of thickness of slab 1mm in active side

As the table shows, in the embodiment consistent with method of the present invention, obtain firm bond state of ◎~zero, particularly, when adopting the core iron heart, reduce half heating time basically, obtains significant effect.

On the other hand, under the situation of omitting guide, the situation when heating time and bond state ratio use guide is poor slightly in the method for the invention.In addition, in the time of in inserting the centre bore of workpiece, in be connected to the guide of workpiece type, bigger than the guide effect that is external in the workpiece type.

In addition, in the method for the invention, as insulator, when adopting pyroconductivity to surpass the insulator of 1.0W/mK, compare with the situation that adopts preferred insulator, increase heating time.In addition, under with the situation of Teflon  sheet monomer as insulator, the resistance to pressure deficiency, increase heating time to some extent, and simultaneously, because distortion, the number of times that insulation board can use reduces.On the other hand, at No.44 and No.45 that Teflon  sheet is used as the sheet surface layer of Rosner plate, the situation when utilizing Rosner plate monomer obtains same effect, and simultaneously, peeling off of insulator and workpiece is simple, the raising operation.

The possibility of industrial utilization

Like this, according to the present invention, can obtain from little to large laminate core, the short time evenly adds the effect of excellence that the laminate core of the electromagnetic steel plate that adds heat-sticking type is used in the hot adhesion manufacturing securely at an easy rate.

Claims (9)

1. laminate core manufacturing installation is characterized in that it comprises: with stacked have the electromagnetic steel plate that adds heat-sticking type insulation tunicle and the workpiece (1) that constitutes along its stacked direction excitation and the induction coil (2) of induction heating,
And, compress two ends of the stacked direction of said workpiece with first, second yoke member that can relatively move without interfering with each other mutually, and when carrying out this compressing, form the yoke (5) of magnetic closed-loop path at the stacked direction of workpiece.
2. laminate core manufacturing installation as claimed in claim 1 is characterized in that, said workpiece is the workpiece that has through hole or groove along stacked direction, has the aforementioned apertures or the interior iron core (7) of groove that insert said workpiece.
3. laminate core manufacturing installation as claimed in claim 1 or 2, it is characterized in that, between said workpiece and aforementioned each yoke member, has the insulation board (6) that constitutes by heat-resisting, withstand voltage nonmetallic materials, and the aforementioned dielectric plate constitutes with the raw material of pyroconductivity below 1.0W/mK.
4. laminate core manufacturing installation as claimed in claim 1 or 2 is characterized in that, aforementioned yoke is when aforementioned compressing, and is formed the yoke of aforementioned magnetic closed-loop path by aforementioned first, second yoke member and at least one other yoke member.
5. laminate core manufacturing installation as claimed in claim 3 is characterized in that, aforementioned yoke is when aforementioned compressing, and is formed the yoke of aforementioned magnetic closed-loop path by aforementioned first, second yoke member and at least one other yoke member.
6. the manufacture method of a laminate core, it is characterized in that, utilize the manufacturing installation of any one described laminate core in the claim 1~5, in the process of the heating and the stacked steel plate of crimping said workpiece, the excitation frequency of aforementioned induction coil is 10~1000Hz, and the compaction pressure of aforementioned yoke is more than 0.1MPa.
7. the manufacture method of laminate core as claimed in claim 6 is characterized in that, aforementioned excitation frequency and aforementioned compaction pressure are so that the magnetic flux density in the workpiece is set along the mode of component more than 0.2T of stacked direction.
8. as the manufacture method of claim 6 or 7 described laminate cores, it is characterized in that, aforementioned yoke is applied the compaction pressure of regulation, then, said workpiece is carried out induction heating by excitation.
9. as the manufacture method of claim 6 or 7 described laminate cores, it is characterized in that, aforementioned yoke is applied to a certain degree compaction pressure, this compaction pressure can prevent the skew that the vibration of the aforementioned electromagnetic steel plate that causes because of excitation causes, then, said workpiece is carried out induction heating by excitation, then, apply the compaction pressure of regulation to aforementioned yoke.
CNB02820302XA 2001-08-17 2002-08-15 Manufacturing apparatus and manufacturing method for laminated core CN1307664C (en)

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JP4987216B2 (en) * 2003-06-25 2012-07-25 Jfeスチール株式会社 Laminated core with excellent dimensional accuracy and manufacturing method thereof
JP4987215B2 (en) * 2003-06-25 2012-07-25 Jfeスチール株式会社 Laminated core with excellent dimensional accuracy and manufacturing method thereof
JP2005019643A (en) * 2003-06-25 2005-01-20 Jfe Steel Kk Laminated core excellent in dimensional accuracy and its manufacturing method
JP2005019641A (en) * 2003-06-25 2005-01-20 Jfe Steel Kk Laminated core excellent in dimensional accuracy and its manufacturing method
JP2005340705A (en) * 2004-05-31 2005-12-08 Jfe Steel Kk Process for producing laminated core excellent in dimensional precision and core strength
JP2005340691A (en) * 2004-05-31 2005-12-08 Jfe Steel Kk Process for producing laminated core excellent in dimensional precision and core strength
KR101458726B1 (en) * 2010-07-23 2014-11-05 신닛테츠스미킨 카부시키카이샤 Electromagnetic steel sheet used for resin molded laminated core and process for production thereof
DE102012000705A1 (en) * 2011-02-11 2012-08-23 Heidelberger Druckmaschinen Ag Method for producing laminated magnetic core used for e.g. electric motor, involves cutting magnet core from stack of punched metal surfaces while retaining shape, so that webs are severed
CN103236765B (en) * 2013-04-17 2015-07-08 哈尔滨电机厂有限责任公司 Process method for vertical induction heating of steam turbine generator core
KR101532015B1 (en) * 2013-12-24 2015-06-26 주식회사 포스코 Thermal bonding apparatus for motor core
US20200086619A1 (en) * 2016-12-22 2020-03-19 Jfe Steel Corporation Method of manufacturing electrical steel sheet with adhesive insulating coating and method of manufacturing stacked electrical steel sheet
CN107548176B (en) * 2017-09-06 2020-09-15 武汉蓝点科技发展有限公司 Amorphous alloy magnet yoke applied to high-frequency induction heating furnace

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