JPH114565A - Apparatus and method for manufacturing laminated core - Google Patents

Abstract

(57) [Summary] [Problem] To provide a manufacturing apparatus capable of improving the bonding strength by welding adjacent press materials by laser, increasing the rigidity of each component, and further improving the efficiency of laser welding work. A manufacturing method is provided. SOLUTION: The die includes a die 12 which rotates by a predetermined angle in conjunction with a vertical movement of a punch 11, and a storage holder 14 which stores and holds a press material 15 punched and laminated by the punch and the die. A gap 21 for passing a beam is formed between the die and the holding member in an annular shape, and a plurality of laser beam emitting devices 22 and 23 are provided at symmetrical positions in the radial direction of the annular gap 21. The symmetrical position in the radial direction between the materials can be welded at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus and method for manufacturing a laminated core formed by joining press materials punched by a press by laser welding.

[0002]

2. Description of the Related Art As is well known, various devices for manufacturing a laminated core used for an electric motor or the like by laser welding have been conventionally provided, and one of them is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 7-241629. Is described in Japanese Patent Application Publication No.

Referring to FIGS. 7 and 8, the apparatus cooperates with a punch 1 having a columnar shape and a metal plate (base material) 2 fed onto an upper surface thereof. Annular die 3 punched into a substantially disk shape
And a press component storage cylinder 5 that is integrally fixedly arranged at the lower portion of the die, and stores and holds the press materials 4 sequentially laminated inside the die 3. A pair of left and right laser beam emitting devices 6 and 7 are provided on the outer peripheral side of the pressed component storage cylinder 5.

[0004] The die 3 and the pressed part storage cylinder 5 are rotated in one direction at a predetermined angle each time the punch 1 moves up and down by a rotary drive means comprising a worm 8a and a worm wheel 8b. In addition, the upper and lower two-stage beam passage holes 9 and 1 are formed in the peripheral wall 5a of the pressed component storage cylinder 5.
0 is notched, and the respective beam passage holes 9,
10 is formed in an arc shape over a rotation angle range of about 180 °.

Accordingly, the press material 4 punched out one after another by the punch 1 and the die 3 is sequentially stacked and moved downward in the die 3 and the press part storage cylinder 5, and at the same time, the vertical movement of the punch 1 Each time, the die 3 and the pressed component storage cylinder 5 rotate in one direction at a predetermined angle, and accordingly, the group of pressed materials 4 also rotates.

When the lower end of the group of press members 4 reaches the upper beam passage hole 9, the upper laser beam emitting device 6
Operates, and the laser beam 6a is irradiated between the adjacent press members 4 and 4 through the beam passage hole 9 to weld them. This welding is performed sequentially, and these welding points P
As shown in FIG. 9, 1 is formed on the helical line over a range of a twist angle of 180 °. After welding is completed through the upper beam passage hole 9, a certain time passes, and the unwelded portion passes through the lower beam passage. When the position of the hole 10 is reached, a welding operation is performed by the laser beam from the lower laser beam emitting device 7, and the welding point P2 is also formed on the helical line over a range of a twist angle of 180 ° as shown in FIG. As a result, a pressed laminated product S having welding points P1 and P2 over a range of a helix angle of 360 ° on the helical line can be obtained.

[0007]

However, in the above-mentioned conventional apparatus, the two beam passage holes 9 and 10 are formed in the peripheral wall 5a of the pressed-parts housing cylinder 5 in two vertical stages in the horizontal direction as described above. In addition, since they are each formed in an arc shape in a rotation angle range of 180 ° in the circumferential direction, a total of 360 ° in the vertical direction
Although the welding points on the spiral wire extending over the wire are obtained, two or more welding points in the circumferential direction of the adjacent pressed materials 4 and 4 are obtained.
In particular, two or more welding points cannot be obtained at symmetrical positions in the radial direction.

That is, the upper beam passage hole 9 and the lower beam passage hole 10 are vertically arranged with a fixed distance L, and the vertical wall and the circumferential wall 5a Since there is a cylindrical wall portion 5b that is a part, the upper beam emitting device 6 first irradiates the adjacent pressing materials 4 and 4 step by step within a range of 180 °, and then the wall portion 5b is shaded. Therefore, the beam cannot be irradiated in the range of the wall 5b. For this reason, after that, when the group of press materials 4 is rotated down and reaches the lower beam passage hole 10, the opposite side to the welding point irradiated by the upper beam emitting device 6,
That is, the symmetrical position in the radial direction deviates from the lower beam passage hole 10, and the welding points P 1 and P 2 are simply formed on the outer periphery of the pressed material 4 by a simple 360 ° spiral line as shown in FIG.
It can only be welded over.

As a result, the bonding strength between the adjacent press members 4 and 4 of the press laminated product S decreases, and there is a possibility that the press laminated product S may be separated by a light impact force or the like.

Therefore, a plurality of beam emitting devices are arranged at the same height in the circumferential direction of each of the upper and lower beam passage holes 9 and 10 to form two or more welding points on one adjacent press material 4. However, in this case, welding at a symmetric position is impossible because the wall portion 5b exists between the beam passage holes 9 and 10.

In order to solve the problem that is impossible with the two laser beam passage holes 9 and 10, the laser beam passage holes 9 and 10 are increased by a multiple in the component storage cylinder 5, and the laser beam emitting means is also provided. It is thought that it is possible to continuously manufacture stamped parts by increasing the number of times each.

However, in this case, in order to continuously weld two welding points at the symmetrical position of the pressed part, four laser beam passage holes and four laser beam emitting means are required. Even one welding point group must be provided with a plurality of these mechanisms. As a result, a large increase in cost is inevitable due to an increase in the number of parts.

Further, in this conventional apparatus, as described above, two arc-shaped beam passage holes 9 and 10 are directly formed in the pressed component storage cylinder 5, so that the rigidity of the pressed component storage cylinder 5 is reduced. In addition to the decrease, the forming operation becomes complicated, which leads to a decrease in the efficiency of the manufacturing operation and an increase in the cost.

[0014]

SUMMARY OF THE INVENTION The present invention has been devised in view of the actual situation of the conventional laminated core manufacturing apparatus, and the invention according to claim 1 cooperates with a vertically moving punch. A die for punching a metal base material into a predetermined shape, and a manufacturing apparatus for a laminated core including a laser beam emitting device for irradiating a beam at a joint between the stamped and laminated press materials and welding the same, A storage holder for storing and holding the laminated press material is provided at a position below the die, and an annular gap for passing a beam is formed between the die and the storage holder, and the annular gap is formed. A plurality of the laser beam emitting devices are provided at arbitrary positions in the circumferential direction of the laser beam emitting device, and a beam of the laser beam emitting device is irradiated to a joint between the press materials through the annular gap.

According to a second aspect of the present invention, the storage holder and the die are coaxially arranged, and the die is rotated by a predetermined angle in conjunction with the vertical movement of the punch. .

According to a third aspect of the present invention, the storage holder and the die are arranged coaxially, and the storage holder is formed rotatable or rotated by a predetermined angle in conjunction with the vertical movement of the punch. It is characterized by doing so.

According to a fourth aspect of the present invention, the storage holder and the die are arranged coaxially, and the die and the storage holder are synchronously rotated in the same direction in conjunction with the vertical movement of the punch. Features.

According to a fifth aspect of the present invention, the die and the storage holder are formed in a substantially cylindrical shape having the same inner diameter.

According to a sixth aspect of the present invention, the die and the storage holder are rotationally driven by a single drive mechanism.

The invention according to claim 7 is characterized in that a concave portion is formed in an outer peripheral edge of each of the stamped stamped materials to absorb welding marks during the laser welding.

The invention according to claim 8 is provided with a detector for detecting a joint position between the press materials continuously laminated inside the die, and a joint position signal detected by the detector is provided. A correction circuit is provided for correcting the beam emission timing of the laser beam emitting device based on this.

According to the ninth aspect of the present invention, after the plate material is punched while rotating the die by a predetermined angle in conjunction with the vertical movement of the punch, the joint between the punched and stacked press materials is provided. In the method of manufacturing a laminated core so as to continuously weld by irradiating a beam by a laser beam emitting device, the beam irradiation of the laser beam emitting device,
The process is performed through an annular gap formed between the die and the storage holder provided below the die.

According to a tenth aspect of the present invention, the storage holder is synchronously rotated in the same direction as the die.

According to the apparatus of the present invention, an annular gap for beam passage is formed between the die and the storage holder. In other words, since the annular gap is formed over the entire circumference between the die and the storage holder, for example, two beam emitters are arranged at symmetrical positions in the radial direction, and the diameter of the adjacent pressed material that has been rotated down is reduced. It becomes possible to weld symmetrical positions in the directions.

Further, since a concave portion for absorbing a welding mark during laser welding is formed on the outer periphery of each pressed material, a convex portion or the like, which is a welding mark between the pressed materials moved into the holding member after the laser welding, is formed in the concave portion. It is absorbed and the protrusion from the outer diameter of the press material is prevented. Therefore, peeling of the welding marks during movement of the press material in the storage holder is prevented.

Furthermore, since the position of the joint between the press materials facing the annular gap by moving inside the die after punching by the press is constantly checked by the detector,
Even if the seam position is slightly displaced in the vertical direction due to burrs generated during pressing or variations in the thickness of each press material, the timing of laser emission is corrected in accordance with the deviation by a signal that detects the position. Therefore, proper welding can always be performed at an accurate joint position between the press materials.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment, in which 11 is a cylindrical punch, 12 is a die for punching a metal plate 13 into a predetermined circular shape in cooperation with the punch 11, 14
Is a storage holder disposed below the die 12, and the punch 11 is vertically moved by a driving mechanism of a press machine (not shown).

The die 12 is formed in a cylindrical shape, and a storage hole 16 for sequentially storing the press material 15 is formed vertically in the inner axial direction, and the punch 11 is moved up and down by a worm 17a and a worm wheel 17b. Each time, it is driven to rotate in one direction at a predetermined angle.

The storage holder 14 is formed in a cylindrical shape like the die 12 and is arranged coaxially.
A holding hole 18 for holding and holding the laminated press material 15 descended from the storage hole 16 of the die 12 is formed vertically therein.
It is set to be the same as the inner diameter of. The storage holder 14 is configured to rotate in the same direction as the die 12 at the same angle by the worm 19a and the worm wheel 19b, so that the worms 17a, 17b, 1
9a and 19b are rotated by one rotation drive mechanism (not shown).

However, the storage holder 14 may be of any type as long as synchronous rotation can be obtained, such as by using a bearing or the like.

An annular gap 21 for passing a beam is formed between the lower end 12a of the die 12 and the lower surface 12b of the die 12 and the upper end 14a of the storage holder 14. The gap 21 is formed in a horizontal annular shape over the entire circumference of the die 12 and the storage holder 14, and has a height H in the vertical direction.
Is such that the laminated press material 15 descended from the storage hole 16 is not deformed or displaced, and does not affect the beam directivity even if a slight inclination occurs in the beam emitting devices 22 and 23 described later. Is set to a suitable width.

Further, a pair of beam emitting devices 22 and 23 are provided outside the annular gap 21. The beam emitting devices 22 and 23 are disposed substantially horizontally at symmetrical positions in the radial direction of the annular gap 21, are fixed by a support mechanism (not shown), and have a laser beam 22 at each end.
Reference numerals a and 23a point to radially symmetric positions between the adjacent press materials 15a and 15b.

In addition, at the outer position of the annular gap 21, FIG.
As shown in FIG. 2, an optical sensor 24 is disposed as a detector for detecting a joint C position between the upper and lower press members 15 facing the annular gap 21. That is, the optical sensor 24 detects a vertical displacement of a joint C position between the upper and lower press members 15 of the press member 15 group sequentially sent out from the die 12 into the annular gap 21. The position of the joint C is detected based on the detected light and the reflected light, and the detection signal is output to the correction circuit 25.

The correction circuit 25 compares the seam C position signal from the optical sensor 24 with a preset reference position to detect a time lag by calculation, and detects the time lag in each of the beams. The beam is output to the emitters 22 and 23 to correct the beam emission timing.

Further, as shown in FIG. 3, a concave portion 26 for absorbing a welding mark 27 due to the beam irradiation from the beam emitting devices 22 and 23 is cut out at a beam irradiation position on the outer peripheral edge of each of the press members 15. ing. The recess 26 is formed at the same time when the metal plate 13 is punched by the punch 11 and the die 12, and is notched by the punch 11 at a predetermined beam irradiation position along the tangential direction of the outer peripheral edge of the press material 15. It has become so.

The recess 25 can be formed in a U-shaped groove on the outer peripheral edge of each press material 15 as shown in FIG.

Hereinafter, a method of manufacturing the laminated core 30 using the above-described apparatus will be described.

That is, first, the metal plate 13 as a base material is continuously punched by the punch 11 and the die 12, and the punched press members 15 are stacked in the storage holes 16 of the die 12 by pressing force. While moving down as a stacking group. Here, since the inner diameter of the storage hole 16 of the die 12 is set so as to be tightly fitted to the outer periphery of the press material 15, each of the press materials 15 is prevented from dropping.

The laminated press material 15 group includes a die 1
As the punch 2 rotates in a predetermined direction at a predetermined angle every time the punch 11 moves up and down, it continuously descends while forming a twisting shape, that is, a so-called skew, and is guided into the holding hole 18 of the storage holder 14. However, the storage holder 14 is also a die 1
2, the group of laminated press materials 15 is continuously guided into the holding holes 18 and maintains the rotation. Here, the inner diameter of the holding hole 18 is set to be substantially the same as the outer diameter of the press material 15 similarly to the storage hole 16, so that the laminated press material 15 can be stably and reliably held.

In this case, since it is sufficient that the skew is obtained stably, it is not absolutely necessary to forcibly rotate the die and the housing 14 by a driving mechanism. For example, only the die 12 is rotationally driven. The storage holder 14 is rotatably arranged by bearings or the like,
2 may be fixed, and only the storage holder 14 may be rotationally driven.

Then, the laminated press material 15 is inserted into the storage hole 1.
6, the optical sensor 24 detects a joint C between the upper and lower press members 15 and 15 and outputs a position detection signal to a correction circuit 25, where each beam is emitted. The beam emission timing of the machines 22 and 23 is set. Then, the adjacent upper and lower press members 15a, 15b
Beams are simultaneously radiated from the respective laser beams 22a, 23a of the two beam emitting devices 22, 23 into the respective concave portions 25, 25 between the joints C, so that the radially symmetric positions of the both press members 15a, 15b are welded. , Are firmly joined. That is,
Since the two press members 15a and 15b are welded at their symmetrical positions in the radial direction by laser welding, the joining strength increases,
A strong bond is obtained.

The beam irradiation by the two beam emitting devices 22 and 23 is continuously performed by pulses, and the adjacent press members 15a and 15b are successively welded one after another. When the beam reaches the length in the axial direction, the beam irradiation is interrupted once, and it becomes possible to separate the laminated core 30 when the laminated core 30 is discharged from the holding hole 18.

The welding points P3 and P4 by the beam irradiation of the beam emitting devices 22 and 23 are formed on the outer periphery of the laminated press material 15 on a spiral line as shown in FIGS.

By forming the gap 21 over the entire circumference in this way, a plurality of beam emitting devices 22, 23,... Can be arranged at arbitrary positions in the circumferential direction, and are adjacent to each other as in the above-described embodiment. Depending on the radially symmetric positions of the press members 15a, 15b, as well as the number and arrangement of the beam emitting devices 22, 23, ...
Flexible simultaneous multi-point welding such as four-point welding at the ° position and five-point welding at the approximately 70 ° position becomes possible. As a result, the press material 15
In addition to obtaining a strong bonding state according to the outer diameter of the product, the accuracy and stability of the product can be improved and stabilized.

In addition, since only the annular gap 21 for beam passage is formed between the die 12 and the storage holder 14 and not a hole in the die 12 or the storage holder 14 itself, In addition to simplifying the structure of the component parts, the rigidity is improved, and with the improvement in the rigidity, the size of the die 12 and the like can be reduced. It becomes possible to manufacture.

Since the die 12 and the storage holder 14 are rotated synchronously, the skew angle of the press material group can be easily and freely selected and firmly welded each time the rotation angle is changed. It becomes possible to do.

Further, since the die 12 can hold the continuously stamped press material 15 on the inner peripheral surface of the storage hole 16 at the lower end 12a, a stable downward movement of the lamination can be obtained, and Since the storage holder 14 is arranged,
Stable support of the laminated core 30 is obtained.

Further, the optical sensor 24 and the correction circuit 25
The beam irradiation timing by each of the beam emitting devices 22 and 23 is corrected in advance by the
It is possible to irradiate the beam at the precise joint C between them. That is, each press material 15 is made of the metal plate material 13.
Due to errors in the thickness accuracy of the material, burrs during punching, deformation of the press material 15 due to the press load at the time of punching, etc., the position of each joint C between the upper and lower press materials 15 may be Although there is a possibility of slight deviation in the direction position, as described above, since the accurate position of each joint C can be detected by the optical sensor 24 and the like and the beam can be irradiated here, the press members 15 are securely welded. It becomes possible.

Further, the recesses 26, 2 are located at the welding positions.
Since the protrusions 6 are formed, the convex welding marks 27, 27 are not absorbed into the recesses 26, 26 and protrude outward from the outer peripheral edges of the press members 15, 15. Therefore, after that, when the press material 15 group passes through the inside of the holding hole 18 of the storage holder 14, welding marks 2 are formed on the inner peripheral surface of the holding hole 18.
7 and 27 can be prevented from sliding and peeling off.
As a result, a stable and strong bonding state of the group of laminated press materials 15 is obtained.

The present invention is not limited to the configuration of the above-described embodiment. For example, only the storage holder 14 can be rotated without rotating the die 12 or vice versa. It is also possible to separately provide a rotary drive for the holder 14.

[0052]

As is apparent from the above description, according to the apparatus of the present invention, an annular gap extending over the entire circumference is formed between the die and the storage holder, so that a plurality of beam emitting devices can be used. It can be arranged at any position in the circumferential direction. Therefore, in addition to the symmetric position on the plane of the adjacent press material,
Since welding can be performed at three, four or more points, the bonding strength of each pressed material is improved.

Further, as described above, since the welding position and the number of welding points to the press material can be arbitrarily set, the bonding accuracy of the laminated core can be improved and stabilized.

Further, instead of forming the beam passage hole directly in, for example, the pressed part storage cylinder as in the conventional case, an annular gap is formed between the die and the storage holder, so that the structure of each component is made. Can be simplified and rigidity can be improved.
As a result, it is possible to reduce the size of each component such as the die and the storage holder.

According to the second to fourth aspects of the present invention,
Not only free skew can be obtained, but also stable and reliable holding of the laminated press material can be obtained by the storage holder.

According to the fifth aspect of the present invention, a stable downward guiding operation of the laminated press material can be obtained by the die.

According to the sixth aspect of the present invention, the apparatus can be simplified by unifying the drive mechanism, thereby improving manufacturing workability and reducing manufacturing costs.

According to the seventh aspect of the present invention, since the projections and the like, which are welding marks between the press materials moved into the storage holder after the laser welding, are held in the form of being absorbed in the recesses, the storage is performed. Separation of welding traces during sliding movement in the holder is prevented, and a stable and strong connection state of each press material can be maintained.

According to the invention described in claim 8, even if an error in the thickness accuracy of each press material or a burr is sandwiched between both press materials, a positional shift occurs at each joint between the press materials. This enables stable and reliable welding at each joint at all times, and eliminates welding errors due to displacement of welding points.

According to the ninth aspect of the present invention, since the beam is irradiated from the annular gap, continuous beam irradiation by the beam emitting device can be performed according to the continuous rotation of the die. Not only the efficiency can be improved and the cost can be reduced, but also an ultra-small laminated core can be manufactured freely.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an apparatus provided in a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the device provided in the embodiment.

FIG. 3 is an enlarged view of a main part of a press material provided in the embodiment.

FIG. 4 is an enlarged view of a main part showing further different concave portions of the press material.

FIG. 5 is a front view of the laminated core showing a welding position in the embodiment.

FIG. 6 is a front view of the laminated core showing a welding position in the embodiment.

FIG. 7 is a longitudinal sectional view showing a conventional device.

FIG. 8 is a perspective view showing a press accommodating cylinder and a beam emitting device of a conventional apparatus.

FIG. 9 is a perspective view showing a laminated core manufactured by a conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Punch 12 ... Die 12a ... Lower end part 12b ... Lower surface 13 ... Metal plate material 14 ... Storage holder 15 ... Press material 15a, 15b ... Adjacent press material 16 ... Storage hole 18 ... Holding hole 21 ... Annular clearance 22, 23 ... Beam emitting device 24: Optical sensor (detector) 25: Correction circuit 26: Recess 27: Welding mark

Claims (10)

[Claims] 1. A die for punching a metal base material into a predetermined shape in cooperation with a punch that moves up and down, and a laser beam emission for irradiating and welding a beam at a joint between the stamped and laminated press materials. And a storage holder for storing and holding the laminated press material, and a beam is provided between the die and the storage holder at a position below the die. An annular gap for passage is formed, and a plurality of the laser beam emitting devices are provided at arbitrary positions in a circumferential direction of the annular gap, and a beam of the laser beam emitting device is passed between the press materials through the annular gap. An apparatus for manufacturing a laminated core, which is irradiated at the joint. 2. The lamination according to claim 1, wherein the storage holder and the die are arranged coaxially, and the die is rotated by a predetermined angle in conjunction with the vertical movement of the punch. Core manufacturing equipment. 3. The storage holder and the die are arranged coaxially, and the storage holder is formed to be rotatable or rotated by a predetermined angle in conjunction with the vertical movement of a punch. The apparatus for manufacturing a laminated core according to claim 1, wherein: 4. The storage holder and the die are arranged coaxially, and the die and the storage holder are synchronously rotated in the same direction in conjunction with the vertical movement of the punch. An apparatus for manufacturing the laminated core according to the above. 5. The apparatus for manufacturing a laminated core according to claim 1, wherein said die and said holding member are formed in a substantially cylindrical shape having the same inner diameter. 6. The laminated core manufacturing apparatus according to claim 4, wherein the die and the storage holder are rotationally driven by a single driving mechanism. 7. The laminated core according to claim 1, wherein a concave portion is formed in an outer peripheral edge of each of the stamped stamped materials to absorb welding marks during the laser welding. Manufacturing equipment. 8. A detector for detecting a seam position between the press materials continuously stacked inside the die, and the laser beam is emitted based on a seam position signal detected by the detector. The apparatus for manufacturing a laminated core according to any one of claims 1 to 7, further comprising a correction circuit for correcting a beam emission timing of the machine. 9. A plate material is punched while rotating a die by a predetermined angle in conjunction with a vertical movement of a punch, and then a beam is emitted by a laser beam emitting device at a joint between the stamped and stacked press materials. In the method of manufacturing a laminated core in which the laser beam is continuously welded by irradiating the laser beam, the beam irradiation of the laser beam emitting device is formed between the die and a storage holder disposed below the die. A method for manufacturing a laminated core, wherein the method is performed from an annular gap. 10. The method for manufacturing a laminated core according to claim 9, wherein the storage holder is synchronously rotated in the same direction as the die.