JP5109545B2 - Method and apparatus for manufacturing laminated core - Google Patents

Description

  The present invention relates to a method for manufacturing a laminated core and a manufacturing apparatus using a steel plate such as a soft magnetic steel plate.

As a method of manufacturing a laminated core (laminated iron core) used for motors and transformers, a plurality of core materials (iron core materials) obtained by punching steel plates are bonded with an adhesive, and integrated as a laminated core. Methods are known (for example, Patent Documents 1 and 2). In this method, a steel plate is fed into an apparatus equipped with an adhesive application means and a punching die (punch / die). First, the steel plate is subjected to punching processing other than the outer periphery of the core material, and then bonded to the steel plate portion to be the core material. After the agent is applied, the outer periphery of the core material is punched into the steel plate. The punched core material is sequentially stacked in the punching hole of the punching means (die), and the stacked core materials are bonded together by the applied adhesive, whereby a plurality of core materials are integrated with the adhesive. A bonded laminated core is obtained.
JP 2001-321850 A JP 2002-151339 A

The punching of the core material is usually performed by applying lubricating oil (hereinafter referred to as punching oil) to the steel plate surface. If punching is performed without using punching oil, the die (punch / die) life will be shortened. It becomes shorter and it becomes difficult to mass-produce the laminated core at a low cost. However, when punching oil is used in the manufacturing methods as disclosed in Patent Documents 1 and 2, the oil is interposed between the bonding surfaces of the core materials to reduce the adhesive strength of the adhesive, and the required core lamination strength cannot be maintained.
In Patent Document 1, an oil removing process for removing press oil is provided before the adhesive application process, and a punching process is provided after the adhesive application. However, there is no description of punching oil in the punching process, and Patent There is no description about punching oil also in the literature 2. Therefore, it is unclear how to ensure at least the die life by using punching oil in the punching process of the outer periphery of the core material after applying the adhesive and ensuring the adhesive strength between the core materials by the adhesive. is there.

  Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to combine a plurality of core materials punched from a steel plate with an adhesive and integrate them as a laminated core using a punching oil. An object of the present invention is to provide a method and an apparatus for manufacturing a laminated core capable of producing a laminated core having a high laminated strength, in which the mold life is secured and the adhesive strength between core materials is not lowered by punching oil.

As a result of investigations to solve the above-described problems of the prior art, the present inventors do not apply punching oil to a steel sheet, and supply punching oil directly to a punch for punching and / or a cutting edge of a die. Thus, it has been found that an appropriate punching process using punching oil can be performed without reducing the adhesive strength between the core materials.
The present invention has been made based on such findings, and the features thereof are as follows.

[1] The main body of the apparatus is composed of an upper die having a punch and a lower die having a die, and a plate-like stripper for pressing the steel plate against the lower die when punching is performed. A punching process is performed between the upper and lower molds and a punching process for inserting a punch through the stripper is performed. Adhesive application step for applying adhesive, punching step for punching the outer periphery of the core material on the steel sheet, and core material lamination / bonding step for stacking the punched core materials and bonding the core materials with the adhesive In the manufacturing method of the laminated core having
In at least one punching step, a method of manufacturing a laminated core which directly supply the punching oil to the punch and die of the cutting edge for stamping,
A deformable application member impregnated with oil is provided as an oil application means inside an insertion hole formed in the stripper, and the punch blade edge comes into contact with the application member to punch the punch blade edge. Let the oil be applied,
A manufacturing method of a laminated core , wherein oil supply means is provided on an outer periphery of a die, and punching oil leached or discharged from the oil supply means travels along the upper surface of the die and is supplied to the cutting edge .
[2] The apparatus body is composed of an upper die having a punch and a lower die having a die, and a plate-like stripper for pressing the steel plate against the lower die when punching is performed. A punching process is performed between the upper and lower molds and a punching process for inserting a punch through the stripper is performed. Adhesive application step for applying adhesive, punching step for punching the outer periphery of the core material on the steel sheet, and core material lamination / bonding step for stacking the punched core materials and bonding the core materials with the adhesive In the manufacturing method of the laminated core having
Without applying the punching oil in a steel sheet, a method of manufacturing a laminated core which directly supply the punching oil to the punch and die of the cutting edge for stamping,
A deformable application member impregnated with oil is provided as an oil application means inside an insertion hole formed in the stripper, and the punch blade edge comes into contact with the application member to punch the punch blade edge. Let the oil be applied,
A manufacturing method of a laminated core , wherein oil supply means is provided on an outer periphery of a die, and punching oil leached or discharged from the oil supply means travels along the upper surface of the die and is supplied to the cutting edge .

[3] The apparatus body is composed of an upper die having a punch and a lower die having a die, and a plate-like stripper for pressing the steel plate against the lower die when punching is performed. A manufacturing apparatus that is disposed between upper and lower molds and has an insertion hole for inserting a punch through the stripper. A punching mechanism part to be applied, an adhesive application mechanism part for applying an adhesive to a steel plate part to be a core material, a punching mechanism part for punching the outer periphery of the core material to a steel sheet, and a core obtained by stacking the punched core material In a manufacturing apparatus having a core material lamination / bonding mechanism unit for bonding materials with the adhesive,
In at least one punching mechanism, an apparatus for manufacturing a laminated core which have a direct supply means punching oil to the punch and die of the cutting edge for stamping,
A deformable application member impregnated with oil is provided as an oil application means inside an insertion hole formed in the stripper, and the punch blade edge comes into contact with the application member to punch the punch blade edge. Let the oil be applied,
An apparatus for manufacturing a laminated core , wherein oil supply means is provided on an outer periphery of a die, and punching oil leached or discharged from the oil supply means is transmitted along the upper surface of the die and supplied to the cutting edge .

  According to the present invention, the punching oil is directly supplied to the punch and / or the cutting edge of the die, so that the punched oil hardly adheres to the punched core material even though the punching oil is used. For this reason, it is possible to manufacture a laminated core having a high lamination strength, in which the mold material life is secured and the adhesive strength of the core material is not lowered by the punching oil.

1 to 3 show an embodiment of a method and apparatus for manufacturing a laminated core according to the present invention. FIG. 1 (a) is an explanatory view showing the processing and processing status of a steel plate x at each manufacturing stage. 1 (b) is an explanatory view showing a cross section of the manufacturing apparatus, FIG. 2 is a partially enlarged view of the punch and stripper shown in FIG. 1 (b), and FIG. 3 is a partially enlarged view of the die. 2A shows a state in which the punch is retracted upward, and FIG. 2B shows an operating state of the punch.
In this laminated core manufacturing apparatus, the apparatus body A is composed of upper and lower molds 1 and 2, the upper mold 1 is a movable mold having a punch, and the lower mold 2 is a fixed mold having a die. Yes. The upper mold 1 moves up and down by a hydraulic drive mechanism (not shown).
The apparatus main body A composed of such upper and lower molds 1 and 2 is provided with each mechanism as shown below. In addition, a material feeding mechanism B (feeding roll) for sequentially feeding the strip-shaped steel plate x into the apparatus main body A is provided on the entry side of the apparatus main body A.

The apparatus main body A includes a punching mechanism unit 3 for punching a steel plate x other than the outer periphery of the core material and an outer peripheral punching mechanism unit 4 for punching the outer periphery of the core material on the steel plate x from the upstream side in the steel sheet feeding direction. ing.
The punching mechanism unit 3 includes a punch 30 provided on the upper die 1 and a die 31 provided on the lower die 2, and performs a punching process other than the outer periphery of the core material such as the inner periphery of the core material and the teeth. Such punching operations other than the outer periphery of the core material may be performed in a plurality of steps, and in that case, a plurality of punching mechanism portions 3 are provided in the steel sheet feeding direction.
The outer peripheral punching mechanism 4 includes a punch 40 provided in the upper die 1 and a die 41 provided in the lower die 2, and performs punching of the outer periphery of the core material (separation of the core material). The punch 40 may also serve as a pressing unit that presses (presses) the punched core material y against the lower core material y.

In the steel plate feeding direction, an adhesive application mechanism unit 5 that applies an adhesive to a steel plate portion serving as a core material is provided between the punching mechanism unit 3 and the outer peripheral punching mechanism unit 4. The adhesive application mechanism unit 5 of the present embodiment is composed of an adhesive discharge unit 50 (discharge nozzle) provided in the upper mold 1 and partially applies the adhesive to the upper surface of a steel plate portion serving as a core material. An adhesive is supplied from the adhesive supply unit 8 to the adhesive application mechanism unit 5. In addition, the adhesive discharge part 50 (discharge nozzle) may be provided in the lower mold | type 2, and you may make it apply | coat an adhesive agent to the lower surface of a steel plate.
The adhesive application mechanism unit 5 can be provided at an arbitrary position upstream of the outer peripheral punching mechanism unit 4 in the steel sheet feeding direction, and the outer peripheral punching mechanism unit can apply the adhesive during the outer peripheral punching process. 4 may be provided integrally. In this case, for example, a configuration in which an adhesive discharge portion (discharge nozzle) is provided inside the punch 40 of the outer peripheral punching mechanism portion 4 may be adopted.

A core material stacking / bonding mechanism 6 for stacking the punched core material y and bonding the core materials with the adhesive is formed in the punching hole 42 of the die 41 constituting the outer peripheral punching mechanism 4 and below the die hole 42. Is provided. The core material stacking / bonding mechanism 6 includes a support 60 that supports the core material below the hole 42 and a heating device 61 (electric heater) for heating the stacked core material to heat and cure the adhesive. Etc.).
Between the upper and lower molds 1 and 2, a plate-shaped stripper 7 (plate pressing) for pressing the steel plate x against the lower mold 2 when punching is disposed. The stripper 7 has insertion holes 70, 71, and 72 through which the punch 30, the adhesive discharge section 50, and the punch 40 are inserted, respectively. For example, the stripper 7 is moved upward by holding means (not shown) having a spring. The mold 1 is held.

The apparatus configuration as described above is the same as that of the conventional apparatus, but the manufacturing apparatus of the present invention is characterized in that it has means for directly supplying punching oil to the punch for punching and / or the cutting edge of the die.
First, with respect to the punches 30 and 40 of the punching mechanism portion 3 and the outer peripheral punching mechanism portion 4, as shown in FIG. 2, oil application means 10 is provided inside the insertion holes 70 and 72 of the stripper 7, and the oil application means 10 Punching oil is supplied (applied) directly to the cutting edges of the punches 30 and 40. The oil application means 10 of the present embodiment is composed of a deformable application member 100 (for example, felt) impregnated with oil, and the cutting edges of the punches 30 and 40 come into contact with the application member 100. Punching oil is applied. By directly applying the oil to the cutting edges of the punches 30 and 40 with the application member 100 impregnated with the punching oil in this manner, the oil is prevented from being excessively supplied and the oil can be prevented from adhering to the steel plate surface. .
Punching oil is supplied from the oil supply unit 11 to the oil application means 10.
The oil applying means 10 may be constituted by other contact type oil applying means or non-contact type applying means such as an oil spray nozzle. Further, the oil applying means 10 can be provided at any place other than the stripper 7.

As for the dies 31 and 41 of the punching mechanism portion 3 and the outer peripheral punching mechanism portion 4, an oil supply means 12 is provided on the outer periphery of the dies 31 and 41 as shown in FIG. The punching oil to be transmitted is transmitted to the upper surfaces of the dies 31 and 41 and supplied to the cutting edges. The oil supply means 12 can be constituted by a member (for example, felt) impregnated with oil, an oil discharge nozzle, or the like.
Punching oil is supplied to the oil supply means 12 from the oil supply unit 13.

Next, an embodiment of the manufacturing method of the present invention using the above manufacturing apparatus will be described.
In the manufacturing apparatus of FIG. 1, the steel plate x is punched and the adhesive is applied by lowering the upper mold 1 (movable mold) with respect to the lower mold 2. At this time, the stripper 7 presses and restrains the steel plate x against the lower mold 2.
Further, the steel plate x is fed into the apparatus main body A by the material feeding mechanism B and is sequentially fed to each process. The steel plate x is not coated with punching oil.

The steel plate x fed into the apparatus main body A is first punched in the punching mechanism portion 3 by the punch 30 and the die 31 except for the outer periphery of the core material (in this embodiment, the inner periphery of the core material). At this time, with the stripper 7 pressing the steel plate x against the lower mold 1, the coating member 100 comes into contact with the cutting edge of the punch 30 while the punch 30 descends in the insertion hole 70 of the stripper 7. Punching oil is applied to the surface. Also, the punching oil discharged or leached from the oil supply means 12 travels along the upper surface of the die 31 and is supplied to the cutting edge of the die 31. Accordingly, the punching mechanism unit 3 supplies the punching oil necessary for the punch 30 and the cutting edge of the die 31, and appropriate punching is performed in a state lubricated with the punching oil. The processing performed here is punching processing of the core material inner periphery and teeth.
Note that punching processing other than the outer periphery of the core material may be performed in a plurality of processes. In this case, the punching mechanism unit 3 is provided for each of the plurality of processes, and the steel plates are fed forward. In the punching mechanism portion 3 for each punching process, punching oil is supplied to the cutting edges of the punch 30 and the die 31 as described above.

Next, the steel plate x is sent to the adhesive application mechanism unit 5, and the adhesive s is partially applied by the adhesive discharge unit 50 to the upper surface of the steel plate portion serving as the core material. There are no special restrictions on the adhesive application shape, but if the adhesive application area is extremely small, the laminated core shape may be wavy and cannot be made into a predetermined shape, so the laminated core can ensure a predetermined shape. Thus, it is preferable to apply partially in a shape close to the outer peripheral punching shape.
Next, the steel plate x is sent to the outer peripheral punching mechanism 4 where punching of the outer periphery of the core material is performed by the punch 40 and the die 41, and the core material y is punched from the steel plate x. At this time, the punching mechanism 3 is the same as that described above, and the coating member 100 is moved in the process in which the punch 40 descends in the insertion hole 72 of the stripper 7 while the stripper 7 presses the steel plate x against the lower mold 1. Comes into contact with the cutting edge of the punch 40, and punching oil is applied to the cutting edge. Further, the punching oil discharged or leached from the oil supply means 12 travels along the upper surface of the die and is supplied to the cutting edge of the die 41. Therefore, the punching oil necessary for the punch 40 and the cutting edge of the die 41 is supplied to the outer peripheral punching mechanism 4 and appropriate punching is performed in a state lubricated with the punching oil.

The punched core material y is stacked in the punch hole 42 of the die 41, and the core material y stacked in the core hole stacking / bonding mechanism 6 in the punch hole 42 and below the punch hole 42 is the adhesive s. Join. At this time, the punch 40 may press (pressurize) the punched core material y against the lower core material to improve the adhesion.
In the adhesive application mechanism unit 5, since the adhesive s is not applied to the steel plate portion constituting the uppermost core material y of the laminated core, only a predetermined number of core materials y are integrally bonded with the adhesive s. A laminated core z is obtained. The support body 60 supports the core material y and the laminated core z laminated below the punched hole 42, and descends each time the punched core material y is laminated. The laminated core z is heated by the heating device 61 to heat and cure the adhesive s between the core materials y.

In the present invention, since the punching oil is applied to the punch and die and punching is performed as described above, the punching oil hardly adheres to the core material y, and the adhesive strength between the core materials is reduced by the punching oil. Thus, a laminated core having a high lamination strength can be obtained.
The punching oil may be supplied to only one of the punch and the die as necessary.
In the above-described embodiment, it is possible to achieve both the securing of the mold life by using the punching oil and the securing of the adhesive strength between the core materials by the adhesive, and it is possible to use a steel plate not coated with the punching oil. Therefore, it is not necessary to provide oil removing means, and the process can be simplified and the apparatus can be downsized.

  In the present invention, the punching oil may be supplied directly to the punch for punching and / or the cutting edge of the die in at least one punching step. Therefore, for example, using a steel plate coated with punching oil, first punching processing other than the outer periphery of the core material, then removing the punching oil by a conventionally known method, then applying the adhesive, Punching oil may be directly supplied to the punch and / or the cutting edge of the die to punch the outer periphery of the core material. Even in such an embodiment, it is possible to achieve both the securing of the mold life by using the punching oil and the securing of the adhesive strength between the core materials by the adhesive.

Explanatory drawing which shows one Embodiment of the manufacturing method and apparatus of this invention Partial enlarged view of punch and stripper shown in FIG. Partial enlarged view of the die shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper die 2 Lower die 3 Punching mechanism part 4 Outer periphery punching mechanism part 5 Adhesive application | coating mechanism part 6 Core material lamination | stacking / joining mechanism part 7 Stripper 8 Adhesive supply part 10 Oil application means 11, 13 Oil supply part 12 Oil Supply means 30, 40 Punch 31, 41 Die 42 Die hole 50 Adhesive discharge part 60 Support body 61 Heating device 70, 71, 72 Insertion hole 100 Application member A Apparatus body B Material feed mechanism x Steel plate y Core material z Laminated core s adhesive

Claims (3)

The device body is composed of an upper mold with a punch and a lower mold with a die, and a plate-like stripper for pressing the steel plate against the lower mold when punching is used for the upper and lower molds. A punching process for punching a steel sheet other than the outer periphery of the core material using a manufacturing apparatus in which an insertion hole for inserting a punch through the stripper is formed , and a steel plate portion to be a core material with an adhesive. An adhesive applying step for applying, a punching step for punching the outer periphery of the core material on the steel plate, and a core material laminating / bonding step for stacking the punched core materials and bonding the core materials with the adhesive. In the manufacturing method of the laminated core,
In at least one punching step, a method of manufacturing a laminated core which directly supply the punching oil to the punch and die of the cutting edge for stamping,
A deformable application member impregnated with oil is provided as an oil application means inside an insertion hole formed in the stripper, and the punch blade edge comes into contact with the application member to punch the punch blade edge. Let the oil be applied,
A manufacturing method of a laminated core , wherein oil supply means is provided on an outer periphery of a die, and punching oil leached or discharged from the oil supply means travels along the upper surface of the die and is supplied to the cutting edge . The device body is composed of an upper mold with a punch and a lower mold with a die, and a plate-like stripper for pressing the steel plate against the lower mold when punching is used for the upper and lower molds. A punching process for punching a steel sheet other than the outer periphery of the core material using a manufacturing apparatus in which an insertion hole for inserting a punch through the stripper is formed , and a steel plate portion to be a core material with an adhesive. An adhesive applying step for applying, a punching step for punching the outer periphery of the core material on the steel plate, and a core material laminating / bonding step for stacking the punched core materials and bonding the core materials with the adhesive. In the manufacturing method of the laminated core,
Without applying the punching oil in a steel sheet, a method of manufacturing a laminated core which directly supply the punching oil to the punch and die of the cutting edge for stamping,
A deformable application member impregnated with oil is provided as an oil application means inside an insertion hole formed in the stripper, and the punch blade edge comes into contact with the application member to punch the punch blade edge. Let the oil be applied,
A manufacturing method of a laminated core , wherein oil supply means is provided on an outer periphery of a die, and punching oil leached or discharged from the oil supply means travels along the upper surface of the die and is supplied to the cutting edge . The device body is composed of an upper mold with a punch and a lower mold with a die, and a plate-like stripper for pressing the steel plate against the lower mold when punching is used for the upper and lower molds. A punching mechanism that is disposed in between and is formed with an insertion hole for inserting a punch through the stripper, in which a device body constituted by upper and lower molds punches a steel sheet other than the outer periphery of the core material The core material by laminating the punched core material, the adhesive coating mechanism part that applies the adhesive to the steel sheet part that will be the core material, the punching mechanism part that punches the outer periphery of the core material on the steel plate In the manufacturing apparatus having the core material lamination / bonding mechanism unit bonded with the adhesive,
In at least one punching mechanism, an apparatus for manufacturing a laminated core which have a direct supply means punching oil to the punch and die of the cutting edge for stamping,
A deformable application member impregnated with oil is provided as an oil application means inside an insertion hole formed in the stripper, and the punch blade edge comes into contact with the application member to punch the punch blade edge. Let the oil be applied,
An apparatus for manufacturing a laminated core , wherein oil supply means is provided on an outer periphery of a die, and punching oil leached or discharged from the oil supply means is transmitted along the upper surface of the die and supplied to the cutting edge .

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