JPH0128896Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a molding device for a laminated iron core that causes the slots of the laminated iron core to move obliquely, so-called skew.

[Conventional technology]

Conventionally, in order to skew the laminated core, there is a molding device that shifts the position of the caulking protrusion of each core plate that makes up the laminated core according to the amount of skew for each core plate (Japanese Patent Application Laid-Open No. 57-11102). −94431).

This mold device rotatably supports a punch and a die that form caulking protrusions, and is equipped with a pilot pin that is slidably supported in the axial direction and has a tapered tip at one of the punch and die. , the other is provided with a pilot hole into which the pilot pin is inserted and removed, one of the punch and the die is rotated by an angle corresponding to the skew amount concentrically with the center of the iron core every press stroke, and the other is inserted into the tapered portion of the pilot pin. It is adapted to be driven by contact between the pilot hole opening and the pilot hole opening.

[Problem that the invention attempts to solve]

In the conventional mold device described above, the taper part of the pilot pin collides with the pilot hole opening every press stroke, which causes abnormal wear, making it impossible to obtain accurate skew rotation, and the cutting edges of the punch and die. If they do not match, it may cause damage to the mold.
The problem is that it is extremely dangerous.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention rotatably supports the punch and die in either one of the steps of forming the slot of the iron core plate and the step of forming the caulking protrusion, and and a drive means for rotating one of the dies concentrically with the center of the core plate by an angle corresponding to the skew amount with each press stroke, and returning it to the skew starting position when the required skew in the laminated core is completed, and a drive means that slides in the axial direction. A guide pin is provided which is movable and is always inserted between the punch and the die.

[Effect]

That is, when one of the punch and die is forcibly rotated by the driving means, the rotational force is transmitted to the other via the guide pin, and the other rotates accordingly. This causes the punch and die to rotate by exactly the same amount.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a main part showing an embodiment of a molding device for a laminated iron core according to the present invention, and shows a station for forming caulking protrusions. In the figure, a caulking protrusion forming punch 1 is rotatably supported between a punch holder 4 and a punch plate 5 by bearings 2 and 3. Furthermore, the die 6 having the punch hole 6a for forming protrusions for caulking is also attached to the bearing 7.
and 8 are rotatably supported between the die holder 9 and the die plate 10.

A guide holder 11 is fixed to the punch 1, and a guide pin 1 is attached to the guide holder 11.
A pin hole 13 into which 2 is inserted is provided. Further, the die 6 is also provided with a pin hole 14 at a position facing the pin 13.

A guide pin 12 is provided in the pin holes 13 and 14, which is slidable in the axial direction and is always inserted. In other words, the press is at top dead center (first
Even in the state shown in the figure, the guide pin 12 is inserted into the pin holes 13 and 14, and when the punch 1 is lowered, the guide pin 12 is inserted into the pin holes 13 and 14 without interfering with the lowering of the punch 1. Move by sliding.

A sprocket 15 is attached to the outer periphery of the die 6, and the die 6 is forcibly rotated by a link chain 16 suspended on the sprocket 15 and a drive device that rotates the link chain 16.

FIG. 2 is a perspective view showing one embodiment of the drive device. The link chain 16 is hung on a sprocket 21 of a drive device 20 installed outside the mold. This sprocket 21 is connected so that rotational force is transmitted from an output shaft 27a of a roller cam indexing device 27 via a shaft 22, a one-way clutch 23, a sprocket 24, a link chain 25, and a sprocket 26. Furthermore, a rotational force in the opposite direction to the rotational force described above can be transmitted to the sprocket 21 from a solenoid 29 via a shaft 22 and a lever 28.

The roller cam indexing device 27 is configured such that the rotation of the crankshaft of the press is transmitted to an input shaft (not shown), and one rotation of the input shaft,
In other words, within one rotation of the crankshaft, a specified phase angle range (for example, a range of ±90° around top dead center)
It is operated by a chisel and performs indexing at a predetermined small angle (for example, 30 degrees). The number of teeth of the sprockets 15, 21, 24, and 26 is determined so that the die 6 rotates by a small angle corresponding to the amount of skew when the sprocket 26 rotates by the predetermined small angle.

Further, the solenoid 29 is normally demagnetized so as not to interfere with the rotation for performing the skew, and is energized when the rotation for performing the skew for one laminated core is completed. When the solenoid 29 is energized, it transmits rotational force to the die 6 through the lever 28, shaft 22, sprocket 21, and link chain 16, causing the die 6 to be skewed in a direction B opposite to the skew direction A as shown in FIG. and move the guide pin 12 to the skew starting position P.
Return to Note that at this time, the one-way clutch 2
3 prevents rotational force from being transmitted to the sprocket 24.

When the die 6 is rotated by the drive device 20, the rotational force is transmitted to the punch 5 side via the guide pin 12, and the punch 5 also rotates accordingly. Thereby, the punch 5 and the punch hole 6a of the die 6 always match, and a caulking protrusion can be formed.

Note that the driving device for rotating the die 6 is not limited to the above embodiment, and a pulse motor 30 may be used, for example, as shown in FIG. 4.

Now, as described above, by rotating the punch 5 and the die 6 for each press stroke, forming caulking protrusions by shifting their positions on each core plate, and stacking and pressing these core plates, as shown in FIG. As shown in FIG. 3, the caulking protrusions 40 are fitted with each other while being shifted one after another, and as a result, a laminated iron core in which the slots 41 are skewed is obtained. In addition, the pulse motor 30
When the direction of rotation of the die is changed within one product using the method, a laminated core skewed in an arrow-head shape as shown in FIG. 6 can be obtained.

In this embodiment, the die side is driven and the punch side is driven, but the reverse may be used. Furthermore, by changing the amount of protrusion of the punch and punching out the caulking projections, it is possible to obtain an iron core plate that does not fit into the preceding iron core plate. Furthermore, in this embodiment, the punch and die at the station for forming the caulking protrusion were rotated to shift the position of the caulking protrusion, but it is also possible to rotate the punch and die at the station for forming the slot to shift the slot position. You can do it like this.

[Effect of idea]

As explained above, according to the present invention, when rotating the punch and die in the station for forming slots or caulking protrusions in order to skew the slots of the laminated iron core, the punch and the die are constantly inserted between the punch and the die. Since both are rotated together by the intervening guide pin, the punch and the punch hole of the die can always be accurately aligned.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts showing an embodiment of a mold device for a laminated iron core according to the present invention, Fig. 2 is a perspective view showing an embodiment of a drive device according to the invention, and Fig. 3 is a skew view of a die. FIG. 4 is a perspective view showing another embodiment of the drive device according to the present invention, and FIGS. 5 and 6 are respectively views of the present invention. FIG. 2 is a cross-sectional view of a laminated core manufactured by a laminated core molding apparatus according to the present invention. 1... Punch, 6... Die, 11... Guide holder, 12... Guide pin, 20... Drive device,
15, 21, 24, 26... Sprocket, 1
6, 25... link chain, 23... one-way clutch, 27... roller cam indexing device,
29... Solenoid, 30... Pulse motor, 4
0...Protrusion for caulking, 41...Slot.

Claims (1)

[Scope of Claim for Utility Model Registration] In the step of forming slots and caulking protrusions, slots and caulking protrusions are formed on each core plate, and each of the iron core plates is laminated and fixed by the caulking protrusions to form a laminated iron core. In a mold apparatus for manufacturing, the punch and the die in either one of the step of forming the slot and the step of forming the caulking protrusion are each rotatably supported,
a driving means for rotating one of the punch and the die by an angle corresponding to the skew amount concentrically with the center of the core plate for each press stroke, and returning it to the skew starting position when the required skew in the laminated core is completed; A guide pin is provided which is slidable and is always inserted between the punch and the die, and the rotational force applied to one of the punch and the die by the driving means is applied to the other through the guide pin. A mold device for a laminated iron core, which is characterized by transmitting