JPS58108948A - Manufacture of laminated core for electric machinery and device therefor - Google Patents

Abstract

PURPOSE:To cancel the deviation in the thickness of a laminated core for an accurate electric device by inverting desired number of core pieces as much as half in the course of laminating. CONSTITUTION:Core pieces which are punched by a movable punch 15 are sequentially laminated in a rotary die 8 upon downward movement of an upper die unit 2. When the number of the laminated pieces becomes as prescribed, an air cylinder is driven to instantaneously move the punch 15 to the position of the punch 15' while the punch 15' to the position of the punch 15. The die 8 is inverted at 180 deg.. Then, when the number of laminated core pieces in the die 8' becomes as prescribed, the punches 15, 15' are similarly moved, and the die 8' is inverted at 180 deg.. This operation is repeated, thereby forming a core which is laminated and integrated in the prescribed thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a laminated core for electrical equipment, particularly a stator core for an electric motor.

Generally, stator cores for electric motors are manufactured by punching strips (band iron plates) made by longitudinally slitting wide steel plates into a predetermined shape in one or two rows, and then stacking and fixing the punched core pieces in sequence. I) The cross-sectional shape of the tabs in the width direction is not uniform over the entire width of the plate, and the iron core made by punching out and laminating strips of this type is If the laminated thickness is uneven, a large laminated core, or an electric root unit such as a motor that is constructed based on the end face of the core, there will be extremely inconveniences in terms of assembly or characteristics.

Therefore, in the past, the lamination thickness deviation of the laminated core was
In order to reduce the number of pieces and ensure that there are no problems with assembly characteristics, the core pieces without lamination protrusions are separated and taken out one by one in the press punching process, and the predetermined number of laminated pieces are taken out in a separate process. At the same time as weighing, half of the iron core (outside half of the number of layers) was rotated halfway (18o).

Conventionally, laminated cores were integrated using bands, pins, or welding joints to prevent uneven laminated thickness. In other words, it is not possible to make the most of the laminated iron core (forming the desired laminated core in the mold), and in addition, the core pieces must be weighed,
There were drawbacks such as the need for equipment, equipment, and workers to turn the system in half, which led to an increase in costs.

Therefore, the lower die part of the stage where the outer shape of the core pieces is to be punched is stamped 1800 times each time the core pieces reach a predetermined number.
A manufacturing method for stator laminated screw cores has been proposed in which the laminated screw cores are rotated to compensate for sheet thickness deviations and to be laminated. It is difficult to rotate the lower mold part midway through the process, so it is necessary to temporarily stop high-speed punching or punch at an extremely slow speed, resulting in poor productivity and poor practical application. .

The present invention enables high-speed punching to perform lamination and integration by caulking the cut and raised protrusions.Examples of the present invention will be described below with reference to the accompanying drawings.

Figures 1 and 2 show a progressive feeding device for manufacturing laminated iron cores, 1 is a lower mold device, 2 is an upper mold device that is provided to be able to move vertically, and a is a vertically movable device for the upper mold device 2. The stripper moves up and down in conjunction with each other, and its vertical movement is guided by a guide post 4. Reference numeral 6 is a metering punch for punching out the cut and raised protrusion of the iron core piece 26 shown in FIG. It is operated by the cam 6 every predetermined number of sheets. Reference numeral 7 denotes a half punch for forming a cut-and-raised protrusion 27 for connecting the core pieces to each other, and the upper mold device 2 is equipped with the punch. 8.8' is a rotary die that laminates and holds the punched core pieces, bearing e.

rotatably supported at e', several gears 10°11
．． 13, 10', 11', 13'(13'
(not shown), and gear shaft 12.12' (12
' is not shown)
4' is connected to (not shown). 16 and 15' are movable punches provided opposite to the rotary die 8.8', and the rotary cam 18 is connected to the rotary cam 18 via the interlocking racks 17 and 17' by an air cylinder 16.16'(16' is not shown).
, 18' are moved to the position where the core pieces 26 are punched out from the strip S, and springs 19 and 19' are inserted into the recesses of the rotary cams 18 and 18'.
The structure is such that punching cannot be performed when it is returned by the urging force of. In addition, in FIG. 3, the movable punch 16
is located at a position where punching can be performed, and the movable punch 1
6' is located at a position where punching cannot be performed. 20 is a guide plate, 21 is a material guide, 22 is a sensor that detects the vertical movement of the upper die device 2, and 23 is a solenoid pulp 24, 24' that is pressed every predetermined number of presses based on the press punching signal from the sensor 22. (24' is 7
Baini! A servo motor 14 drives the air cylinders 16, 16' to move the punches 5, 15, 15' and rotates the rotary dies 8, 8'.
, 14' at a set timing and angle.

FIG. 3 shows the state of punching out the strip S at each station of the manufacturing apparatus, and FIG. 4 shows the shape of the finally punched core piece 26, where 26 is a slot, 2
Reference numeral 7 denotes a raised protrusion that connects the core pieces to each other.

Next, to explain the operation, as shown in Fig. 3, the portion of the strip S that has reached station I is subjected to inner diameter punching and slot punching at the previous station, and only when necessary at this station ( For example, only when the core piece is located at the lowest layer of a laminated core, or when the core piece is located at the lowest layer during inverted lamination described later), the measuring punch 6 is operated to engage the hole 28 with the cut-and-raised protrusion 27. A punching operation is usually not performed. Next, at station ■, the upper die device 2 is lowered to
Cut and raised protrusions 27 are formed at 90° intervals using a half punch 7. Next, the strip S transferred to station (2) is punched out by the movable punch 16 as the upper die device 2 is lowered, and at the same time, the strip S is immediately inserted into the recess of the cut-out protrusion 27 of the punched iron core piece 26. Now, the protrusions of the cut and raised protrusions 27 of the punched iron core piece 25 are engaged using caulking action, and the pieces are stacked in the rotary die 8. At this time, no punching operation is performed at station 2', and the strip S punched at station m simply passes through. When the number of stacked sheets at station m reaches a predetermined value (for example, half of the final number of stacked sheets) (relative to the predetermined value of zero punching signal from the sensor 21), based on the signal from the control device 23, the solenoid pulp 24,
2a operates to drive the air cylinders 16 and 16', and the movable punch 16 becomes the movable punch 16 in FIG.
On the other hand, the movable punch 16' instantly shifts to the position of the movable punch 16 in FIG. is started.

During the punching operation at this station ■', the control device 23
The servo motor 14 is driven based on the signal from the rotary die 8, and the rotary die 8 is rotated 1800 times. Next station ■′
When the number of sheets punched and laminated at station ■ becomes the same as the number of sheets laminated at station ■, the punching and lamination operations at station ■' are interrupted, similar to the operations described above, and the punching and lamination operations at station ■ are stopped for the remaining half. Once started, the rotary die 8' is now rotated by 180°. When the punching and laminating operations at station (2) are completed, the punching and laminating operations at station (2') are started again, and the core shown in FIG. 6, which is laminated and integrated to a predetermined lamination thickness, is formed.

Note that the strip S is intermittently transferred in the direction of the arrow in synchronization with the vertical movement of the upper die device 2. Further, in the embodiment, the layers are reversed at half the final number of laminated sheets, but the number of times of reversal can be changed depending on the stacking thickness.

As is clear from the above description, the present invention has an iron core of 1 ol
In the core, which is made by providing cut-and-raised protrusions at predetermined positions on the strips and laminated and integrated by utilizing the caulking effect of the cut-and-raised protrusions with each other, the strip plate is turned in half at the desired number of sheets in the middle of lamination. Thickness deviations are offset, and a highly accurate laminated core for electrical equipment can be obtained. In addition, since at least two identical stations are provided for punching and laminating operations, and the operations are switched alternately, there are no restrictions on the rotation of the rotary die when punching or laminating operations at the station are interrupted. As a result, there is no need to slow the press punching speed or stop the press punching, and high-speed press punching is possible.
Productivity is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the main parts of the manufacturing apparatus according to the present invention;
Figure 2 is a longitudinal sectional side view of the device, Figure 3 is a plan view showing the shape of the punched strips at each station of the device, Figure 4 is a plan view of the punched core pieces, and Figure 6 is the lamination of the same core pieces. FIG. 2 is a perspective view of a laminated core. 11"-7 7, Φ, φ... Half punch, 8, 8'...
・Rotating die, 14.14'...Servo motor (drive device), 15, 15'...Movable punch, 16, 16'...Air cylinder (switching device), 22・0...Sensor, 23...
Control device. Name of agent: Patent attorney Toshio Nakao and 1 other person13
Figure 5 Figure 1

Claims (2)

[Claims] (1) After internal diameter punching, slot punching, and half-blanking of the cut and raised protrusions for connecting the core pieces to each other, the core pieces are punched in a rotary die and at the same time, the cut and raised protrusions are caulked together and stacked. The core lamination step is carried out at at least a first station and a second station, and the first
After punching and laminating a predetermined number of core pieces at the station, the operation is interrupted, and in conjunction with the interrupted operation at the first station, the punching and lamination of the core pieces are performed at a second station. During the punching and lamination of core pieces at this second station, the rotary die provided at the first station is rotated 180 degrees, and then the second station punches and laminates the same number of core pieces as the first station. When this happens, the punching and laminating operations at the second station are interrupted, and in conjunction with this interrupted operation, the core pieces are cut again at the first station. Punching and lamination are started, and during the punching and lamination of the core pieces at the first station, the rotary die provided at the second station is rotated by 18oO, and the number of core pieces punched and laminated at the first station reaches a predetermined number. Then, the operation is stopped, and the same number of core pieces as in the first station are punched and laminated again at a second station, and at least two sets of laminated cores are obtained by inverting and laminating each predetermined number of core pieces. . (2) a half-blanking punch that forms a cut-and-raised protrusion for connecting the core pieces; and a first and a half-blanket punch that punches out the core pieces and simultaneously engages the cut-and-raised protrusions to form a laminated unit. a second movable punch, first and second rotating dies that are rotatably provided to face the first and second movable punches and hold punched iron core pieces in a stacked manner; and a drive device that rotates a second rotary die by a predetermined angle, and detects the number of core pieces punched, and drives the drive device to select the second rotary die from the first rotary die every predetermined number of core pieces. a control device that rotates the first movable punch or the second movable punch based on a signal from the control device, and stops the punching operation of the first movable punch or the second movable punch in conjunction with the rotation of the first or second rotary goug. and a switching device that causes the first
and an apparatus for manufacturing a laminated core for electrical equipment, which obtains a laminated core in which a predetermined number of cores are inverted and laminated in a second rotating gou.