JP3722539B2 - Manufacturing method of annular laminated iron core and progressive mold apparatus - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method of manufacturing an annular laminated core and a progressive mold apparatus, and more particularly, an annular laminated core such as an electric motor core is laminated from a long strip-shaped rolled steel sheet using a progressive mold apparatus with a small stacking thickness deviation. The present invention relates to an annular laminated core manufacturing method and a progressive mold apparatus suitable for efficient production in a state.
[0002]
[Prior art]
As a method for manufacturing this type of annular core, for example, there is a first conventional technique as disclosed in Japanese Patent Laid-Open No. 1-264548.
[0003]
In this first prior art, a long plate is continuously connected to a unit plate assembly that forms a part of a thin iron core and is connected in series with a fan-shaped unit plate having a plurality of slot portions via a connecting portion. By punching, laminated plates connected linearly are formed, and then supplied to a jig to bend and deform each connecting portion to form an annular core, thereby obtaining an annular core.
[0004]
According to this manufacturing method, there are effects such as an improvement in the yield of the rolled steel sheet as the iron core material and an improvement in the efficiency of the assembly work.
[0005]
However, with this manufacturing method, the thickness deviation due to rolling of the rolled steel sheet cannot be eliminated, and when the annular core is assembled, the lamination thickness is not constant over the entire circumference, but becomes inclined, resulting in dimensional accuracy of the core product. In addition, the magnetic performance may be deteriorated.
[0006]
In addition, the efficiency of the assembly work can be improved as compared with the case where the fan-shaped unit plates are assembled and stacked one by one in the jig, but the unit plate coupling bodies are stacked one or two pieces on the jig. The above method of rotating is not necessarily efficient.
[0007]
Next, as a means for eliminating the thickness deviation due to rolling, for example, there is a second prior art disclosed in Japanese Patent Publication No. 4-48530.
[0008]
This second prior art is a method of rotating an external punching (blanking) die. When punching an iron core with a blanking die at a plurality of locations on a strip-shaped iron plate and caulking and stacking the punching iron cores within the die, a plurality of locations are provided. The blanking die was moved simultaneously to the position of the blanking die adjacent to each press stroke to eliminate the thickness deviation.
[0009]
However, the iron core shape that can be implemented in the case of the second prior art is limited to that having a small diameter with respect to the width of the belt-like iron plate and a symmetrical shape that can be simultaneously punched, and is disclosed in the first prior art. It cannot be applied to the production of a unit plate assembly having a long and asymmetric shape.
[0010]
[Problems to be solved by the invention]
Therefore, in the present invention, a long and asymmetrical iron core like the unit plate connector disclosed in the first prior art is laminated in a state where the thickness deviation due to rolling is canceled using a progressive die apparatus. It is an object of the present invention to provide an annular laminated core manufacturing method and a progressive die apparatus for manufacturing a unit laminated body and winding the unit laminated body to efficiently produce an annular core product.
[0011]
[Means for Solving the Problems]
In order to achieve the above-described object, in the method for manufacturing an annular laminated core according to the present invention, a progressive die is used in such a manner that the unit plate pieces having a shape obtained by dividing the annular core into a plurality of parts are connected via a connecting portion. In addition to sequentially punching the connecting unit plates from the long rolled steel plate, each connecting unit plate is externally punched and stacked in a prescribed number in a die of a progressive die to form an integral unit laminate, An annular core product is formed by winding the unit laminated body taken out from the die while deforming the connecting portion, and in the punching process, the unit plate pieces are rolled in a direction perpendicular to the rolling direction. Two types of connecting unit plates whose directions are opposite to each other are punched, and in the outer shape punching and laminating process, one connecting unit plate is rotated 180 degrees every predetermined number of times. Square connecting unit plate has to be laminated in.
[0012]
Moreover, the progressive die apparatus used for the manufacturing method of the said cyclic | annular laminated iron core provides two sets of punch and die | dyes which perform said 2 types of punching in the said punching process, and said 2 in the said external punching and laminating process. Two sets of punches and dies for performing various types of external punching were provided, and this die was provided in a rotating die and rotated 180 degrees so that it could be moved directly under the other punch.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the shape of the unit laminated body 1 in the first embodiment taken out from the progressive die apparatus, and FIG. 2 shows an annular core product 2 manufactured by winding the unit laminated body 1 in FIG. The shape of is shown.
[0014]
As shown in FIG. 1, the unit laminate 1 includes a plurality of (six in the embodiment) fan-shaped unit plate pieces 3 and 3 each having a plurality of slots 17 along the inner peripheral side. A long connecting unit plate 5 is formed by being connected to each other via the connecting portion 4, and the connecting unit plates 5 are stacked for a specified number of sheets necessary for the product, and the connecting unit plates 5 adjacent to each other in the vertical direction are stacked. The unit plate pieces 3 and 3 are integrated via a connecting means such as a caulking projection 20.
[0015]
When the unit laminated body 1 is wound outside the mold by using a molding jig (not shown) to bend and form the connecting portion 4, as shown in FIG. The annular laminated iron core 2 that is integrally joined with the side surfaces 3a, 3b of the adjacent unit plate pieces 3 in close contact with each other is completed.
[0016]
FIG. 3 shows a progressive mold apparatus for manufacturing the unit laminated body 1, FIG. 4 shows a process diagram for manufacturing the unit laminated body 1, and step (1) in FIG. (2) shows a slot punching step, step (3) shows a measuring hole punching or caulking projection forming step, and step (4) shows an outer shape punching and laminating caulking step.
[0017]
The progressive metal mold apparatus 10 includes an upper mold 11 and a lower mold 12, and intermittently rolls a rolled steel plate 13 in the form of an iron core material at a predetermined pitch along the feed direction F between the upper mold 11 and the lower mold 12. The unit laminated body 1 is discharged from the die of the final step (4) by performing predetermined processing using processing means such as a punch and a die provided for each of the steps (1) to (4). However, each step will be described below.
[0018]
In the pilot hole punching step of step (1), a punch 15a for punching the pilot hole 14a in the front row side plate surface A and a punch 15b for punching the pilot hole 14b in the rear row side plate surface B are provided on the upper die 11 side. A corresponding die 16a and a die 16b corresponding to the punch 15b are provided on the lower mold 12 side, and the length direction, that is, the feeding direction of the rolled steel plate 13 is provided on both sides in the width direction of the rolled steel plate 13 using these punches and dies. Pilot holes 14a and 14b are drilled at a predetermined pitch along F, and the rolled steel sheet 1 is intermittently sequentially fed into the progressive die apparatus 10 at a predetermined feed pitch P using the pilot holes 14a and 14b as positioning means. .
[0019]
In the slot punching step of step (2), a punch 18a for punching the slot 17a on the front row side plate surface A and a punch 18b for punching the slot 17b on the rear row side plate surface B are provided on the upper die 11 side, and a die corresponding to the punch 18a. 19a and a die 19b corresponding to the punch 18b are provided on the lower die 12 side, and a swirl 17a is formed by using these punch and die to form a plurality of slot groups arranged in an arc along the width direction of the rolled steel sheet 13. , 17b are drilled, and the circular arcs are obliquely reversed so that the slots 17a and 17b are aligned in a state where either the front row side plate surface A or the rear row side plate surface B is rotated by 180 degrees and overlapped. It is punched in the opposite state.
[0020]
In the step of punching the measuring holes or forming the caulking projections in the step (3), the punch 21a for punching the measuring holes 20a in the front row side plate surface A, the punch 23a for raising and forming the caulking projections 22a, and the rear row side plate surface B A punch 21b for punching the measuring hole 20b and a punch 23b for cutting and forming the caulking projection 22b are provided on the upper die 11 side, and a die 24a corresponding to the punch 21a, a die 24b corresponding to the punch 21b, and a punch 23a are provided. A die 25a corresponding to the die 25b and a die 25b corresponding to the punch 23b are provided on the lower die 12 side, and punching of the measuring hole and molding of the caulking projection are performed using these punch and die.
[0021]
The measuring holes 20a and 20b are punched into the front row side plate surface A or the rear row side plate surface B to be the first connection unit plate 5 to be stacked, and the caulking projections 22a and 22b are connected to the remaining number of stacked layers. The unit plate 5 is cut and raised with respect to the front row side plate surface A or the rear row side plate surface B, and thereby the connecting unit plates 5 adjacent to each other are connected to each other when stacked in a pressurized state in the next step. At the same time, separation is performed when a predetermined number of sheets are stacked.
[0022]
Note that the punches 21a and 21b for the measuring holes 20a and 20b and the punches 23a and 23b for the caulking projections 22a and 22b are always at rest positions where the punches 21a and 21b are raised at the operating position where the punches 23a and 23b are lowered. For example, a control device (not shown) that receives a control command from the step (4) moves the punch so that the position is switched every predetermined number of sheets, thereby enabling product punching and stacking control. ing.
[0023]
In the outer shape punching and laminating caulking step in the step (4), the upper die 11 includes a punch 26a for performing outer shape punching (blanking) on the front row side plate surface A and a punch 26b for performing outer shape punching (blanking) on the rear row side plate surface B. A die 27a corresponding to the punch 26a and a die 27b corresponding to the punch 26b are provided in the rotary die 28 on the lower mold 12 side.
[0024]
The rotary die 28 is connected to a rotary drive device 30 such as an index device via a power transmission means such as a timing belt 29, a chain, or a gear as in the embodiment, and the rotary drive of the drive device 30 linked to the press stroke. Thus, it can be rotated 180 degrees on the horizontal plane with reference to the rotation center C.
[0025]
The rotation center C is set at an intermediate portion between the front row side plate surface A and the rear row side plate surface B. On both sides of the rotation center C, a slot group punched on the front row side plate surface A and a slot group punched on the rear row side plate surface B are provided. 3 are arranged symmetrically, when the rotary die 28 is rotated 180 degrees from the state of FIG. 3, the die 27b is positioned directly below the punch 26a for punching the front row side plate surface A, and the rear row side plate surface B The die 27a can be shifted to a state directly under the punch 26b for punching.
[0026]
In step (4), which is the final step of the progressive die apparatus 10, the slot 17a and the caulking projection 22a are already punched into the front row side plate surface A in the previous step, and the slot 17b and the caulking projection 22b are formed in the rear row side plate surface B. In the normal state, the connected unit plate 5a punched out from the front row side plate surface A by the punch 26a is dropped into the die 27a, and the punch 26b cuts out the outer shape from the rear row side plate surface B in the normal state. The connected connecting unit plate 5b is pulled out to the die 27b, and is connected to the die 27a or the die 27b by caulking projections 22a or caulking projections 22b in a stacked state, and a measuring hole is formed at a predetermined number of sheets. Connecting unit removed from front row side plate surface A or rear row side plate surface B provided with 20a or measuring hole 20b Preparative plate 5 is interposed, thereby resulting in unit laminate 1 of Figure 1 formed by laminating a connection unit plate 5 a predetermined number of fabricated.
[0027]
However, since the thickness deviation due to rolling is superimposed as it is in the above-described laminated state, the rotary die 28 is rotated 180 degrees by the rotation driving device 30 to eliminate this, and the outer shape punching and the laminating caulking connection in this state are performed. Is done in a timely manner.
[0028]
That is, when the rotary die 28 is rotated 180 degrees, the connecting unit plate 5a punched out from the front row side plate surface A by the punch 26a is moved by the punch 26b into the die 27b from which the connecting unit plate 5b has been removed. Since the connection unit plate 5b externally punched from the rear row side plate surface B is to be pulled out from the state of FIG. 4 into the die 27a from which the connection unit plate 5a has been removed so far. Even if there is a plate pressure deviation in the width direction (short side direction) of the rolled steel sheet 13, it can be offset and laminated with a substantially constant stacking thickness. It is arbitrarily set according to the pressure deviation.
[0029]
In the above embodiment, the case where the connecting unit plate is formed by the fan-shaped unit plate pieces having a large number of slots has been described. However, the number and shape of the slots, as well as the number and shape of the caulking projections, or the unit plate pieces are described. However, the present invention is not limited to this number, and various modifications can be made within the scope of the gist.
[0030]
For example, as in the embodiment shown in FIGS. 5 and 6, nine unit plate pieces 31 each having a T shape are connected by a connecting portion 32 to form a connecting unit plate 33. The unit laminated body 34 laminated in a predetermined number can be manufactured by a progressive mold apparatus, and the unit laminated body 34 can be wound using a jig to form the annular core product 35.
[0031]
Reference numeral 36 denotes a caulking projection for integrating the connecting unit plates 33 adjacent to each other in the vertical direction. Instead of the connecting means by the caulking projection 36, for example, the connecting unit plate is formed by using laser spot welding. 33 connecting portions 32 may be fixed. In this case, a welding laser irradiation means is incorporated in the die (die) in step (4), and a press is performed when stacking the connection unit portion plates 33 that have been punched out. It is also possible to integrate in conjunction with the operation.
[0032]
【The invention's effect】
As is apparent from the above description, according to the method for manufacturing an annular laminated core and the progressive die apparatus according to the present invention, the following effects can be obtained.
In this manufacturing method, two types of connection unit plates having the opposite directions are punched, and the other connection unit plates are stacked in a state where one connection unit plate is rotated 180 degrees for each predetermined number of sheets. As a result, the thickness deviation generated along the width direction of the rolled steel sheet is offset to obtain a unit laminate body with a uniform stacking thickness. And magnetic performance is improved.
[0033]
Since the unit laminate is manufactured sequentially by the progressive die device, the work efficiency is good, and the yield is good because the plate is cut along the width direction of the rolled steel plate. By simply rotating the die 180 degrees, stacking can be easily performed in a state where the thickness deviation is offset.
[Brief description of the drawings]
FIG. 1 shows the shape of a unit laminate in a first embodiment formed by a progressive die apparatus.
FIG. 2 shows the shape of an annular core product produced by winding the unit laminate of FIG.
FIG. 3 shows a progressive mold apparatus for producing a unit laminate.
FIG. 4 is a process diagram for manufacturing a unit laminate.
FIG. 5 shows the shape of a unit laminate body in a second embodiment formed by a progressive die apparatus.
6 shows the shape of an annular core product manufactured by winding the unit laminate of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,34 Unit laminated body 2,35 Annular iron core product 3,31 Unit plate piece 4,32 Connection part 5,5a, 5b, 33 Connection unit plate 10 Progressive die apparatus 11 Upper die 12 Lower die 13 Rolled steel plates 14a, 14b Pilot hole 15a, 15b Punch (for pilot hole punching)
16a, 16b Die (for pilot hole punching)
17, 17a, 17b Slot 18a, 18b Punch (for slot punching)
19a, 19b Die (for slot punching)
20a, 20b Measuring holes 21a, 21b Punch (for punching measuring holes)
22, 22a, 22b Caulking projections 23a, 23b Punch (for caulking projection molding)
24a, 24b Die (for measuring hole punching)
25a, 25b Die (for caulking projection molding)
26a, 26b Punch (for external punching)
27a, 27b Die (for laminated caulking)
28 Rotating Die 29 Timing Belt 30 Rotation Drive Device

Claims (2)

Each unit plate piece having a shape obtained by dividing the annular iron core into a plurality of pieces is connected via a connecting portion, and the connecting unit plate is sequentially punched from a long rolled steel plate using a progressive die, and each connection The unit plate is punched out of shape and laminated to a specified number in a die of a progressive die to form an integrated unit laminate, and then wound while deforming the connecting portion of the unit laminate taken out from the die. A method for producing an annular laminated core for forming an annular core product,
During the punching process using the progressive die, the slot group in which a plurality of slots are arranged along the width direction of the rolled steel sheet was rotated 180 degrees in two rows in the front and rear direction with respect to the front row side plate surface and the rear row side plate surface. Simultaneously punching the outer shape of the other connecting unit plate including the slotting step of the slot for punching in the opposite facing state, one connecting unit plate including the slot group on the front row side plate surface and the slot group on the rear row side plate surface, and the front row An external punching and laminating caulking process is provided in which a rotating die having a center of rotation set between the side plate surface and the rear row side plate surface is rotated by 180 degrees for each predetermined number of layers in conjunction with the press stroke. Manufacturing method of annular laminated iron core.   In the progressive die apparatus used in the manufacturing method of the annular laminated core, the slot punching process is performed in two rows in the front and back rows in the opposite direction rotated 180 degrees with respect to the front row side plate surface and the rear row side plate surface. Two sets of punches and dies for punching each slot group are provided. In the outer shape punching and laminating caulking process, one connecting unit plate including the slot group on the front row side plate surface and the other including the slot group on the rear row side plate surface are provided. Two sets of punches and dies for punching and stacking the connecting unit plates in front and rear at the same time in two rows are provided, and each die is set with the middle part of the front row side plate surface and the rear row side plate surface as the center of rotation. A progressive die apparatus for manufacturing an annular laminated core, which is provided in a rotating die that is linked and rotated 180 degrees every predetermined number.

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