JP2681320B2 - Laminated core mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated core die device in which a skew formed in a laminated core can be freely changed and a laminated core having excellent electromagnetic characteristics can be manufactured.

[0002]

2. Description of the Related Art In a motor, a skew is formed in a laminated iron core incorporated in the motor in order to make the torque characteristic smooth.

The laminated iron core is manufactured by a progressive die because of its high productivity and good product. In the production of a laminated core using this mold, with the adjacent core component through the caulking part consisting of the cut-and-raised protrusion hole and the cut-and-raised protrusion provided in communication with the skew escape hole formed in the iron core component. The die for receiving the laminated iron core is rotated in order to form a predetermined skew by fitting and caulking and connecting.

The laminated iron core manufactured by such a conventional progressive die means has a constant skew direction. It is important that the skew is not disturbed and the direction is constant, in order to stabilize the electric characteristics of the motor and prevent the generation of abnormal noise. On the other hand, if the direction of skew is constant, the rotor of the motor has a problem of being subjected to an axial thrust that pushes it out of the stator.

To solve this problem, it is known that the skew direction may be changed in the laminated iron core, and conventionally, a die apparatus for manufacturing the laminated iron core by changing the skew direction has been proposed. For example, in Japanese Examined Patent Publication No. 1-358585, the relief holes (skew relief holes) of the cut-and-raised portion are punched out at a predetermined interval in the first step, and then in the second step, at positions offset from the first step. The relief hole of the cut-and-raised part is punched into another core component piece, and in the third step, the cut-and-raised hole for forming the lowermost core component piece of the laminated iron core is punched out. A punch having two kinds of blades inclined on both sides so as to form a cut-and-raised portion is installed, and a relief hole for the cut-and-raised portion formed in the first step by the punch and a second punch.
The cut-and-raised protrusions are formed in the cut-and-raised portions formed in the process so that the cut-and-raised protrusions are oriented in opposite directions. Then, in the iron core outer diameter punching and laminated caulking in the fifth step,
A predetermined number of iron core component pieces, which have been formed through the first step and the fourth step and have the raised protrusions, are laminated and caulked, and then cut and raised in the right direction formed through the second step and the fourth step. The direction of skew is changed by stacking and crimping a predetermined number of iron core component pieces having protrusions.

This has the function and effect of obtaining a laminated iron core in which the skew direction is changed, but the above-mentioned 2 is applied to the escape holes of the cut and raised portions formed in separate iron core component pieces by shifting the positions. Because of the relationship of forming the protrusion by cutting and raising with a punch having various kinds of blades, the relief hole of the cut and raised portion is inevitably large, which causes disturbance in the magnetic flux passing through the built-in laminated iron core as the rotor of the motor. Further, the formation area of the cut-and-raised protrusions becomes large, which also adversely affects the flow of magnetic flux. Further, if the clearance hole in the cut-and-raised portion is made small, there is a possibility that galling or reversal may occur on the cut-and-raised portion clearance hole side due to a small clearance between the punch and the die.

Further, the strip, which is the material of the iron core component, has a non-uniform plate thickness in the width direction or length direction of the strip due to bending of rolls during rolling, and the thickness of the iron core component is also the same. There is a deviation within the plane.

Therefore, when the iron core component pieces are connected by laminating and caulking, the iron core component pieces pulled out to the rotary die portion are displaced by the skew angle, but are laminated in almost the same posture. The tendency of is almost constant in the plane of the plate, so that the laminated iron core formed of them has an inclination called a banana shape and becomes a defective product.

[0009]

DISCLOSURE OF THE INVENTION In the present invention, in the production of a laminated iron core having a skew shape changed by a progressive die, the produced laminated iron core does not disturb the magnetic flux when it functions as a rotor. An object of the present invention is to provide a die device which has excellent electromagnetic characteristics, and is solved without being affected by the plate thickness deviation of the iron core constituent pieces, and which produces a laminated iron core called a banana shape without a defective shape. Another object of the present invention is to provide a die device of a laminated iron core that has no possibility of causing galling or turning back in the relief hole (skew relief hole) of the cut and raised portion.

[0010]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a station in which punches for forming escape holes for skew are provided at predetermined intervals and a through hole which communicates with the escape holes for skew from the left and right sides. Cutting station that forms a caulking protrusion that communicates with the station
Part is provided only in one place in the direction of formation of the caulking projection.
Forming a first projection forming station having a punch formed therein and a caulking projection communicating with the escape hole for skewing from the other side
The inclined blade part is located at one place in the forming direction of the caulking protrusion.
A second protrusion forming station having a punch provided only, a station operation control device for switching the operation of the first protrusion forming station and the second protrusion forming station, and the first protrusion forming station and the second protrusion forming station, respectively. A laminated iron core die device comprising: a station for punching an iron core component piece having a crimping projection formed thereon into a rotatable rotary die and laminating a predetermined number of the crimping projections.

[0011]

According to the present invention, since the die station is provided as described above, the caulking projections are separated by the iron core component from one side and the other side with respect to the skew escape hole formed at a predetermined position. Since the punch is provided so that it can be formed in the same way, the skew escape hole can be made small correspondingly,
Further, since the formation area of the cut-and-raised protrusions that fit with the skew escape holes can be reduced, the laminated core incorporated in the motor as the rotor does not disturb the flow of magnetic flux and has excellent electromagnetic characteristics. Further, when the iron core component pieces are caulked and laminated, the rotary die can be rotated to perform skew angle and lathe stacking, so that the shape of the skew formed in the laminated iron core can be changed as a matter of course. Even if there is a thickness deviation, the shape defect such as banana shape does not occur. In addition, there is no occurrence of galling or returning in the skew escape hole.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings based on one embodiment. In the drawing, IS is the first
A punch 1 is provided at a station, and a skew relief hole 3 is formed in an iron core component 2. Further, in this embodiment, a shaft hole punch 4 and a pilot punch 5 are provided, and a shaft hole 6 and a pilot hole 7 are formed. A second station 2S is provided with a slot punch 8 and a slot 9 in this embodiment. The drilling of the slot 9 does not necessarily have to be performed at the second station and may be performed at another station concurrently with another punching operation.

Reference numeral 3S is a third station, which is provided with a through hole punch 11 for forming a cut-off through hole 10 communicating with the skew escape hole 3 from the left and right sides, and an iron core component piece 2 placed at the bottom of the laminated core. Is punched at the station 3S. The through-hole punch 11 is provided such that its tip can be projected and withdrawn from the lower surface of the stripper 29. For this structure that can be projected and retracted, a slide plate 31 or an advancing / retreating device provided with a taper cam and a solenoid 32 is adopted.

Reference numeral 4S is a fourth station, and in this embodiment, a punch 13 which communicates with the skew escape hole 3 from one side, for example, the left side, forms a caulking projection, for example, a cut-and-raised projection 12.
Is provided. As shown in FIG. 3, the punch 13 communicates with the skew escape hole 3 from the left side of the skew hole 3-1 to form a protrusion 12 which is cut and raised, so that the skew hole 3-1 is free from defects such as galling and warpage. Does not happen. Also, the punch 1
3 is a single inclined knife portion 13-1, so that its size can be reduced.

The tip of the punch 13 is a stripper 29.
It is provided so that it can be projected and withdrawn from the bottom surface. This advance / retreat mechanism does not have to be limited, but in this embodiment, as shown in FIG. 8, a slide plate 31 having a recess 30 is provided on the punch base end portion 1.
3-2, the slide plate 31 is provided on the upper side of the solenoid 32
The punch base end portion 13-2 is engaged with or disengaged from the recessed portion 30 so that the tip end of the punch 13 is projected or retracted from the lower surface of the stripper 29. This advancing / retreating mechanism is adopted for the protrusion / retreat of the main stations 11 and 15 of the third station 3S and the fifth station 5S described later.

5S is a fifth station, which communicates with the skew escape hole 3-1 from the other side, for example, the right side in this embodiment, as shown in FIG.
A punch 15 is formed to form the cut and raised protrusion 12 and the skew hole 3-1 formed in the fourth station 4S.
A cut-and-raised protrusion 14 is formed in the direction opposite to the above. This punch 15 can also be made small because there is only one inclined blade portion 15-1. Naturally, the skew escape hole 3-1 to be formed is also made small. In addition, the inclined blade portion 1 is provided on the skew hole 3-1 side.
Since there is no 5-1 there is no risk of galling or return. Further, the punch 15 is connected to the fourth station 4
Similar to the punch 13 of S, its tip is provided so as to project and retract from the lower surface of the stripper 29, and is advanced and retracted by an advancing and retracting device including a slide plate 31 and a solenoid 32.

Reference numeral 6S denotes a sixth station, in which the punch 16 and the rotary die 17 perform the external punching of the iron core constituting piece 2 which becomes the rotor lamination, the caulking and the skewing are performed, and the iron core constituting piece 2 is drawn into the rotary die 17. Is a cut-and-raised projection hole 18 of the preceding iron core component 2
Are fitted and joined together.

The rotary die 17 is a die plate 19
And the die holder 20 is the bearing 2 in this embodiment.
A sprocket 22 is provided on the outer side of the sprocket 22. Reference numeral 23 denotes a rotational force transmitting member, for example, a timing belt, a chain, etc. are adopted.
And the rotary die 17 is rotatable.

The rotary driving method of the rotary die 17 is not limited to this embodiment, but means for rotating the rotary die by connecting the servo motor and the rotary die with gears, or an index device for rotating the punch 16 through a stroke signal of the press of the punch 16 or the like. Rotation means is adopted.

Numeral 25 is a servo motor control device which inputs a stroke signal of the press and a plate thickness deviation signal of the iron core component 2 and outputs a rotation operation command in this embodiment every time the stroke signal is input. Further, the inputted plate thickness deviation signal is compared with the allowable plate thickness deviation value set in the comparator 26 in the control device 25, and the rotation angle for turning is separately inputted so as to eliminate the plate thickness deviation depending on the magnitude. It is added to the skew angle and output.

Reference numeral 27 denotes a station operation control device which controls the operation of the fourth station 4S and the fifth station 5S to change the iron core component 2 sent to the sixth station 6S to change the skewed shape of the laminated iron core. .

Next, the operation will be described. The material thin strip 28 of the iron core component 2 is sent to the first station 1
Pilot hole 7 and skew escape hole 3 and shaft hole 6 at S
Is drilled.

In the second station 2S, a slot 9 is drilled in this embodiment and then sent to the third station 3S.

At the third station 3S, the solenoid 3
2 is operated to attach the tip of the through hole punch 11 to the stripper 29.
Cut-out through holes 10 are formed so as to project from the lower surface and communicate with the skew escape hole 3 from both left and right sides. The core core component 2 thus pierced is placed at the bottom of the laminated core. After drilling, the tip of the through hole punch 11 is retracted from the lower surface of the stripper 29.

In the fourth station 4S, the skew relief hole 3 is communicated from the left side in this embodiment, and the protrusion 13 is cut and raised by the punch 13. When the fourth station 4S is in operation, the punch 15 of the fifth station 5S is retracted from the lower surface of the stripper 29, so that the cut and raised protrusions are not formed. The protrusions and retreats of the punches 13 and 15 from the lower surface of the stripper 29 are performed by operating the solenoid 32 in response to a command from the station operation control device 27.

The iron core component 2 cut and raised at the fourth station 4S and formed with the projections 12 is punched out by the punch 16 at the sixth station 6S and preceded in the rotary die 17 as shown in FIG. It is caulked and connected to the iron core component 2 in which the cut-out through hole 10 is placed. At this time, the rotary die 17 is rotatable, and in this embodiment, when the in-plane plate thickness deviation of the iron core component 2 is equal to or larger than a preset allowable plate thickness deviation value in addition to an angle corresponding to a predetermined skew angle. Is
It is rotated by the servo motor 24 by adding the rotation angle. This rotation control is performed by a control command from the servo motor control device 25.

After stacking a predetermined number of iron core component pieces 2 formed through the fourth station 4S, the skew shape of the laminated core is changed as follows. The tip of the punch 13 of the fourth station 4S is a stripper 29.
The punch 15 of the fifth station 5S has its tip projected from the lower surface of the stripper 29 so as not to project from the lower surface. Control of the withdrawal and projection of the tips of the punches 13 and 15 is performed by a command from the station controller 27.

Thus, the core component piece 2 having the raised protrusions 14 formed at the fifth station 5S and the core component piece 2 which has been profile-extracted at the sixth station 6S and which is preceded in the rotary die 17 and is caulked. They are caulked and connected as shown in FIG. In this caulking connection as well, the rotary die 17 is rotationally controlled as described above. In this way the rotary die 1
A punch having a desired inclination is formed in the laminated iron core by punching 7 and pressing and connecting with 7.

When the core component pieces 2 are caulked and laminated in this manner, a laminated core having a skewed shape is manufactured.

[0030]

As described above, according to the present invention, a skew escape hole is formed and a through hole communicating with the skew escape hole from the left and right sides is formed, and the skew escape hole is provided on one side. And a second projection forming station provided with a punch that communicates with each other to form a caulking projection, and a second projection forming station that includes a punch that communicates with the escape hole for skewing from the other side to form a caulking projection. Since the punch forming the caulking protrusion can be made small in size and the escape hole for skew can be made small, the laminated core manufactured by the mold of the present invention functions as a rotor, It has the feature of not disturbing

Further, it goes without saying that a laminated iron core having a skewed shape is manufactured, and when the iron core component pieces having the caulking protrusions are laminated and caulked, the rotary die is rotatably controlled. When the plate thickness deviation exceeds the allowable deviation, the iron core component pieces are rolled and stacked, and a laminated iron core having a remarkably excellent overall shape is manufactured.

[Brief description of the drawings]

FIG. 1 is a view showing a cross section of a laminated core die device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a laminated core component in one embodiment of the present invention.

FIG. 3 (a) shows a cross section of a caulking projection from one side of an iron core component. (B) The cross section of the caulking projection hole from one side to the iron core component and the formation of the cut and raised projection by the punch.

FIG. 4 (a) is a cross-sectional view of a caulking projection from the other side of the iron core component. (B) The cross section of the caulking projection hole from one side to the iron core component and the formation of the cut and raised projection by the punch.

FIG. 5 is a diagram showing a rotary die portion in one embodiment.

FIG. 6 is a view showing a state where the laminated core pieces are caulked and connected in one embodiment.

FIG. 7 is a diagram showing a state where the laminated core pieces with different skew shapes are caulked and coupled in one embodiment.

FIG. 8 is a view showing a projecting / retracting advancing / retreating device of the punch from the lower surface of the stripper in one embodiment.

[Description of numbering]

 1 Punch 2 Iron core component piece 3 Skew relief hole 4 Shaft hole punch 5 Pilot punch 6 Shaft hole 7 Pilot hole 8 Slot punch 9 Slot 10 Cut-through hole 11 Through-hole punch 12 Cut-and-raised protrusion 13 Punch 14 Cut Raising protrusion 15 Punch 16 Punch 17 Rotating die 18 Cutting and raising protrusion hole 19 Die plate 20 Die holder 21 Bearing 22 Sprocket 23 Power transmission body 24 Servo motor 25 Servo motor control device 26 Comparator 27 Station operation control device 28 Thin strip 29 Stripper 30 Recess 31 Slide plate 32 Solenoid

Claims (1)

(57) [Claims] And 1. A station punch for drilling the skew for relief hole digits set at predetermined intervals, a station which is bored a through-hole communicating with the skew for the escape holes from the left and right side, the skew for relief hole Caulking protrusion that communicates from one side
The inclined blade part that forms the rise is the direction in which the caulking protrusion is formed.
A first protrusion forming station having a punch provided only in one place of, to communication from the other side to the skew for relief hole
The slanted blade forming the protrusion for caulking is the protrusion for caulking.
A second projection forming station having a punch provided only at one position in the direction of forming a rise, a station operation control device for switching between operations of the first projection forming station and the second projection forming station, and It is characterized in that it comprises a station for punching an iron core component piece having crimping projections formed at each of the first projection forming station and the second projection forming station into a rotatable rotary die and laminating a predetermined number of the crimping projections. Laminated core mold equipment.