JPH07194072A - Stacked iron core and its manufacture - Google Patents

Abstract

PURPOSE:To remove the gap between calked and stacked iron pieces, and remove the height deviation in the stacked iron cores, and also, make skews freely by forming reversely conical projections and through holes for calking side by side and besides, with their positions changed separately for each stack. CONSTITUTION:For stamped pieces, where reversely conical projections 11 and through holes 12 for calking are made in each rotor piece 9 alternately side by side and besides with their positions changed separately for each stack, the reversely conical projections 11 are stacked in order in the through holes 12 for calking of the rotor pieces 9 stacked in advance. At this time, skews are made by stacking them while rotating them so that gouging phenomena or axial thrust force does not occur in the stacked rotors 30 at the time of operation as a motor. Hereby, it becomes possible to caulk them, removing push-up between the iron cores of the rotor pieces 9 and the stator pieces' and remove the gaps between the stacked iron cores, and change the shape of the skews freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated core and a method for manufacturing the same.

[0002]

2. Description of the Related Art A motor has a stator core and a rotor core in which core pieces are laminated. In these laminated cores, for example, as described in JP-A-52-47563, the cut and raised projections for caulking formed on the core pieces are fitted into the cut and raised projection holes of the pre-loaded core pieces to be laminated. .

In addition to the above-mentioned method for crimping and laminating, a V-shaped iron core piece, for example, as disclosed in JP-A-56-25344,
Alternatively, as disclosed in Japanese Utility Model Application Laid-Open No. 57-95045, there is one in which a trapezoidal projection is formed and fitted into a projection hole of a pre-loaded iron core piece to be laminated.

By these caulking means, the iron core pieces are fitted and laminated in the mold device, and when the laminated iron core, for example, the rotor iron core is incorporated into the motor and rotated, the iron core piece operates smoothly without causing a gogging phenomenon. It is manufactured by skewing. in this case,
When the iron core pieces are fitted with the caulking projections through the caulking through holes or the recesses, they receive a torsional force, and a small gap, for example, of the order of several microns, may be generated between the iron core pieces in the laminating direction.

[0005]

A skew is attached to the laminated core, for example, in a V shape so as to prevent the gogging phenomenon and prevent thrust from being generated in the axial direction of the core. In the manufacture of the laminated core, the core core piece is provided with a escape hole for skew,
Next, a cut-and-raised protrusion communicating with the escape hole is formed, the core piece is punched out, and the core piece is punched and fitted into the through-hole for crimping or the cut-and-raised projection hole while rotating according to the skew angle. . When the stacking thickness becomes an intermediate thickness, a cut-and-raised protrusion that communicates from the opposite direction to the escape hole for skew is formed on the iron core piece, then punched, and then rotated in the opposite direction to the skew angle and fitted according to the skew angle. I am fit.

As described above, it is necessary to form the escape hole for skew in the iron core piece, and to cut and raise the protrusion for the escape hole so that the direction of the protrusion is changed, which is a multi-step manufacturing process.

In addition, when the skew is attached, the cut-and-raised protrusions of the iron core pieces and the cut-and-raised protrusions and the cut-and-raised protrusion holes of the next laminated iron core piece are more strongly intertwined with each other, and the caulking portion between the iron core pieces is strengthened. A gap is created in the stacking direction. Although the gaps are in micron order and are small individually, they are integrated when they are laminated, causing a deviation in the laminated thickness of the crimped portion and the non-crimped portion, and causing end face blurring in the laminated core, for example, the rotor laminated core.

In an iron core piece having a V-shaped protrusion and a trapezoidal protrusion as the caulking shape, when the iron core pieces are rotated and fitted to each other to form a V-skew on the laminated iron core, the caulking part inclined surfaces of the iron core pieces are fitted to each other. It is strong and creates a gap between the iron core pieces due to distortion. Further, the skew shape is highly resistant to change, and it is difficult to make the skew shape as desired.

It is an object of the present invention to provide a laminated core in which the core pieces do not cause a gap due to the mutual interference in the crimped lamination of the core pieces, there is no deviation in the laminated thickness of the laminated core, and the skew can be freely attached.

[0010]

DISCLOSURE OF THE INVENTION The gist of the present invention is to provide an iron core in which a caulking through hole formed in an iron core piece is fitted with a caulking projection of another iron core piece and laminated, and an inverted chevron projection is formed on the same iron core piece. A plurality of through holes for caulking are formed adjacent to each other, and the inverted chevron projections of the iron core pieces are formed in the through holes for caulking of the pre-loaded iron core pieces.
The inverted chevron projections of the iron core pieces to be stacked later are fitted in the through holes for crimping of the iron core pieces, respectively, and are skewed to each other, and the laminated iron cores are sequentially laminated by skewing. Another point is that in the method of manufacturing an iron core in which a caulking protrusion is formed on an iron core piece, punched, and fitted into the caulking hole of a pre-loaded iron core piece and laminated, a caulking through hole is formed in the first iron core piece in the lamination. A plurality of the core pieces, each of which is formed by adjoining an inverted chevron projection and a caulking through hole on each of the subsequent iron core pieces, and changing the formation positions of the inverted chevron projection and the caulking through hole for each stack. Is punched, the inverted chevron projections of the core piece are skewed into the through holes for caulking of the pre-loaded core piece, and are fitted and sequentially laminated.

[0011]

According to the present invention, a plurality of through holes for caulking are formed in the first core piece of the laminated body, and in addition, inverted chevron projections and through holes for caulking are alternately and adjacently formed in each iron core piece, and for each laminated body. The iron core piece formed by changing its forming position in reverse is punched with the inverted chevron projection and fitted into the through hole for caulking of the iron core piece previously stacked. At this time, the inverted chevron projections and the crimping through holes are alternately formed on the iron core piece as described above, and the laminated iron core pieces have their respective inverted chevron projections independently in the crimping through holes of the other iron core pieces. Since they are fitted to each other, the inverted chevron projections do not abut each other between the laminated core pieces, and no gap is formed in the stacking thickness direction. Further, since the skew is attached, the rotation and stacking can be easily performed, and the skew shape can be freely formed, for example, in a V shape, a W shape, or a curved shape.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings based on an embodiment. The present invention can be applied to various laminated cores, but in this embodiment, a laminated core for a ceiling fan motor in which a rotor is arranged around the outer periphery of the stator will be described. In the drawing, reference numeral 1 is a material metal plate of an iron core piece, and a pilot hole 2 and a shaft hole 3 are bored in the first station 1S. Second
In the station 2S, the slots 4 and the air holes 5 of the stator piece are formed.

In the third station 3S, a plurality of inverted chevron projections 6 for caulking the stator and caulking through holes 7 are formed adjacent to each other, four in this embodiment, a total of eight. Also,
The inverted chevron projection 6 has a V shape, an inverted trapezoidal shape, or the like.

In the fourth station 4S, the third station is used.
Inverse chevron projection 6a and caulking through hole 7 as in section 3S
a is formed, but the formation positions thereof are reversed, and the caulking through hole 7a is provided at the position of the inverted chevron protrusion 6 in the third station 3S, and the inverted chevron protrusion 6 is provided at the position of the caulking through hole 7.
a is formed. A drive system is provided so that the fourth station 4S and the third station 3S are alternately punched.

In the fifth station 5S, the outer diameter of the stator piece 8 is removed, and the inverted chevron projections 6 and 6a and the through holes 7 and 7a for caulking are caulked, and the layers are sequentially laminated.

In the sixth station 6S, the slot 10 of the rotor piece 9 is bored. In the seventh station 7S, the inner diameter of the rotor piece 9 is removed, the inverted chevron projection 11 and the caulking through hole 12 are formed. The inverted chevron protrusions 11 and the caulking through holes 12 are formed alternately adjacent to each other.

In the eighth station 8S, the inner diameter of the rotor piece 9 is removed, and the inverted chevron projection 11a and the caulking through hole 12a are formed as in the seventh station 7S. It is the opposite of station 7S.
Also, the eighth station 7S and the seventh station 7S
The drive system is designed to operate alternately.

In the ninth station 9S, the outer diameter of the rotor piece 9 is removed, and the inverted chevron projections 11 and 11a are caulked through the caulking through holes 12 and 12a, and are sequentially laminated.

Next, the production of the laminated iron core by the progressive die device will be described with reference to FIG. 13 is a punch for a pilot hole, 14 is a punch for an axial hole, and the pilot hole 2 and the axial hole 3 of the first station 1S are removed. Reference numeral 15 is a slot punch, 16 is an air hole punch, and the second station 2
The slots 4 and the air holes 5 of the stator piece 8 of S are removed.

Reference numeral 17 is a punch for an inverted chevron projection in the third station 3S, and 18 is a punch for a caulking through hole. The inverted chevron projection 6 and the caulking through hole 7 are formed adjacent to each other on the stator piece 8. The protrusion 17 for the inverted chevron projection has a variable protrusion length from the lower surface of the stripper 19, and the protrusion length is made large with respect to the first laminated stator piece 8, and all the through holes 12 for caulking are formed. The mechanism for varying the protrusion length of the punch is arbitrary, but in this embodiment, it is as follows. The inverted chevron projection punch 17 is provided with a slide plate 21 provided with a recess 20 on the rear side of the base end of the inverted chevron projection slidably, and the slide plate 21 is slid by an advancing / retreating drive device 22 so that the recess 20 has a reverse chevron projection punch 17.
When the base end portion is engaged, the protrusion length of the tip of the chevron protrusion punch 17 from the lower surface of the stripper 19 is reduced, while when disengaged, the protrusion length is increased.

Reference numeral 17a is a punch for the inverted chevron projection of the fourth station 4S, and 18a is a punch for a caulking through hole. As shown in FIGS. 3A and 3B, the inverted chevron projection 6a and the caulking through hole 7a. Is formed by reversing the position of the case of the third station 3S. Further, the fourth station 4S and the third station 3S are adapted to operate alternately with respect to the progressive feeding of the stator piece 8.

Numeral 23 is an outer diameter punching punch of the fifth station 5S. The punched stator piece 8 is skewed in the rotary die 24 and caulked and laminated. In the lamination, the inverted chevron projection 6 of the punched stator piece 8 is fitted into the caulking through hole 7a of the pre-stacked stator piece 8.

Numeral 25 is a punch for punching the rotor piece 9 in the sixth station 6S. Reference numeral 26 is a punch for the inverted chevron protrusion of the seventh station 7S, and 27 is a punch for a caulking through hole, which forms the inverted chevron protrusion 11 and the caulking through hole 12 on the rotor piece 9. The protruding length of the inverted chevron protrusion 26 to the lower surface of the stripper 19 can be changed in the same manner as the inverted chevron protrusion punch 17 of the stator piece 8 described above. And the through holes 12 for caulking are all formed. Subsequent rotor pieces 9 have a small protruding length, and an inverted chevron projection 11 and a caulking through hole 12 are formed adjacent to each other.

26a is a punch for the inverted chevron projection in the eighth station 8S, and 27a is a punch for the caulking through hole. The punch 26a for the inverted chevron projection and the punch for the caulking through hole are different from those of the seventh station 7S. The installation of 27a is reversed. The eighth station 8S and the seventh station 7S operate alternately. Thus, the punched rotor piece 9 is the laminated rotor piece 9 immediately before.
The positions of the inverted chevron projection 11a and the caulking through hole 12a are reversed.

Reference numeral 28 denotes an outer diameter punch, which punches the rotor piece 9 onto the rotary die 29, crimps it through the inverted chevron projections 11 and 11a and the crimping through holes 12 and 12a, and successively stacks them.
At this time, as shown in FIG. 4, the skew is formed by rotating the rotating die 29 so that the laminated rotor 30 does not generate a gogging phenomenon or axial thrust as a motor during operation. The shape of the skew can be freely changed to a V shape, a W shape, or the like. In addition, the formation of the skew 31 has a great effect in the case where the rotor is provided on the outer periphery of the stator and the diameter is large like the ceiling fan motor laminated iron core of the embodiment.

[0026]

The iron core pieces of the present invention, such as the rotor piece and the stator piece, are formed with the inverted chevron projections and the through holes for caulking adjacent to each other, and the iron core pieces that are laminated and meet each other have the inverted chevron projections and the through holes for caulking. The holes are formed by reversing the installation position. Therefore, if these iron core pieces are sequentially laminated, even if the inverted chevron projections of the rear iron core pieces are skewed and fitted into the through holes for crimping of the iron core pieces that are stacked first, the iron core pieces will not interfere with each other. Without crimping, there is no gap between the laminated core pieces. As a result, the laminated core has excellent stacking height between the crimped part and the non-crimped part, and has an excellent shape.When the laminated core is the rotor laminated core, there is no end face deviation, and when the laminated core is the stator laminated core, it is wound. Line work can be done smoothly and accurately. Further, there is an effect that the skew shape can be freely changed.

[Brief description of drawings]

FIG. 1 is a diagram showing punching of an iron core piece in each station in one embodiment of the present invention.

FIG. 2 is a diagram showing a mold device according to one embodiment of the present invention.

FIG. 3 is a view showing an inverted chevron protrusion and a through hole for caulking formed on an iron core piece according to one embodiment of the present invention.

FIG. 4 is a diagram showing a rotor manufactured according to an embodiment of the present invention.

[Explanation of symbols]

 1 Material Metal Plate 2 Pilot Hole 3 Shaft Hole 4 Slot 5 Air Vent 6,6a V-Shaped Protrusion 7,7a Caulking Through Hole 8 Stator Piece 9 Rotor Piece 10 Slot 11, 11a Reverse Angle Protrusion 12, 12a Caulking Through Hole 13 Punch for pilot hole 14 Punch for axial hole 15 Punch for slot 16 Punch for air hole 17, 17a Punch for inverted chevron protrusion 18, 18a Punch for caulking through hole 19 Stripper 20 Cavity 21 Slide plate 22 Forward / backward drive device 23 Outside diameter punch 24 rotary die 25 slot punch 26 inverted chevron projection punch 27 caulking through hole punch 28 outer diameter punching punch 29 rotary die 30 rotor 31 skew

Claims (2)

[Claims] 1. An iron core in which a crimping through hole formed in an iron core piece is fitted with a crimping projection formed in another iron core piece and stacked, and an inverted chevron projection and a crimping through hole are formed adjacent to each other in the iron core piece. The inverted chevron projections of the iron core piece are fitted into the through holes for caulking of the pre-loaded iron core piece, and the inverted chevron projections of the trailing iron core piece are fitted into the through holes for caulking of the iron core piece, respectively, and are skewed and sequentially laminated. Laminated iron core characterized by having. 2. A caulking through hole is formed in an iron core piece, then a caulking projection is formed in a laminated iron core piece, these iron core pieces are punched out, and the caulking projection is fitted into the caulking through hole to be laminated. In the iron core manufacturing method, a plurality of through holes for crimping are formed in the first core piece of the laminate at intervals, and thereafter, the inverted chevron protrusions and the through holes for crimping are adjacent to each other in the laminated core piece, and for each laminate. The inverted chevron projection and the caulking through hole are formed at different positions, the iron core piece is punched out, and the inverted chevron projection of the iron core piece is skewed and fitted into the caulking through hole of the pre-loaded iron core piece and sequentially laminated. A method of manufacturing a laminated core, comprising: