JPS6099438A - Manufacture of laminated iron core - Google Patents

Abstract

PURPOSE:To obtain a laminated iron core of small lamination thickness deviation in manufacturing by caulking in a die, by changing the position of plural blanking dies in a process of simultaneous blanking and caulking of the core at every specified press stroke. CONSTITUTION:A material to be worked 1 is pitch fed and then blanked by blanking dies 3a-3c and caulked and held in respective dies 3. After repeating this operation specified number of times, a holder 4 is rotated counterclockwise by 120 deg. by an index 6, and the die 3a is replaced to the position of a former 3b, 3b to the position of a former 3c, and 3c to the position of a former 3a respectively. These operations are repeated. Thus, lamination thickness deviation of dies can be made small and anisotropy of magnetic characteristic due to direction of rolling of the material can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a laminated iron core using an in-mold caulking method.

Conventional structure and problems The steel strips used in the production of laminated cores are manufactured by slitting wide rolled plates, but due to the deflection of the rolling rollers, the cross section becomes trapezoidal as shown in Figure 1. and
Therefore, the cross section of the steel strip also becomes trapezoidal. You can punch out plates with such a cross-sectional shape and stack them in that state, or:
Seven rules J: It becomes a trapezoid as shown in Figure 2, which causes problems in terms of product performance.

Instead, use the conventional in-mold caulking knob method: ruf, li
The method for manufacturing the layered core is such that the 7t planking dies 2a, 2b, and 2c provided in the mold 1 shown in Fig. 3 rotate at every predetermined stroke due to the rotation of the crankshaft of the press, so that the thickness deviation of the core is canceled out. It had been.

However, since the bluffing dies 2a, 2b, and 2c rotate at fixed positions in the configuration shown in A14, as shown in FIG. LL, but Buranogi no Dadai 2a, 2b.

Since the plate thickness deviation at the position 2C is not canceled out, the stacked thickness deviation between the blanking dies becomes large. By the way, A11 of the 111-shaped iron plate, which is a cumulative moon. ′! Plate 1'j'7 deviation in direction is 0.02
When #IJ is used and 60 sheets of each are laminated to form an iron core, the deviation in stacking thickness is 1 ml, which has a negative effect on product performance and set q.

Too bad, as the number of holes increases, the installation space for the blanking die becomes very large, the mold becomes larger, the driving force required to rotate the die increases, and the engagement length of the timing belt becomes shorter. This had the disadvantage of reduced rotational accuracy.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a method for manufacturing a laminated iron core with less deviation in stack thickness.

The method for manufacturing a JJJI layered iron core of the present invention includes a plurality of blanking dies in the step of punching out the core and a device for positioning these at a predetermined press stroke of 4U. I'f/J is formed, which can reduce the stacking thickness deviation of the plankinog die, and reduce the magnetic properties of 1/1' in the rolling direction of the old Tamoto I, making the mold smaller. It has the unique effect of reducing the driving force required to rotate the die and increasing rotation accuracy.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 shows a portion of a laminated core manufacturing apparatus according to an embodiment of the present invention, in which the core is punched out and crimped at the same time.

In FIG. 6, 3a, 3b.

3C is blacking die, 4 is planki/gudai 3a,
3b and 3c are held by a holder, 5 is a sprocket attached to the holder 4, 6 is an index, and 7 is a timing belt that is attached to sprockets 6 and 7.

Regarding the laminated core manufacturing equipment configured as above,
The operation will be explained below.

] 1. After sending 1 pitch, Bra/Ki/
It is swaged at the same time as it is punched out using the metal dies 3a, 3'b, and 3c, and held in each blacking die. After repeating this operation for a predetermined number of rotations, the index 6 (・') holder 4 is rotated counterclockwise by 12 CP, and the blacking die 3a is moved to the red position 3b, and 3b is moved to the 3c (r) f position of 7L. In the first row, 3C is replaced in the position 3a of 51:.Then, the actions of Nire et al. By providing several blacking dies to be replaced by rotation at every predetermined press stroke, the laminated core is formed from an iron core punched from three locations at medium heat and both ends of the workpiece. Deviations in the thickness of processed materials are canceled out, making it possible to manufacture a laminated core with less deviation in stacked thickness.

In addition, in this example, the number of animals taken was three, but it is not a stretch to think that the number of animals that can be taken is two or more.

Effects of the Invention As described above, the method of the present invention makes it possible to prevent the laminated core from being damaged by replacing the positions of a plurality of blacking dies in the caulking step at the time of punching the core at every predetermined press stroke. Since it is formed from an iron core punched out from various parts of the core, it is possible to reduce the deviation in stacking thickness and also to reduce the anisotropy of the magnetic properties, which has great practical effects.

[Brief explanation of drawings]

Figure 1 is a 1111 cross-sectional view of a wide IE rolled plate used in the manufacture of a laminated core, and Figure 2 is a cross-sectional view of a laminated core formed using a part of the II rolled plate shown in Figure 1. 1. 3rd
The figure is a side view of a laminated iron core manufacturing apparatus using the conventional in-mold caulking method, FIG. 4 is a cross-sectional view of a laminated iron core manufactured by the mold shown in FIG. FIG. 7 is a 7-side view of a laminated iron core manufacturing apparatus that implements the method according to the embodiment J. 3a, 3b, sc... Blacking die, 4...
...Holder, 6...Sprocket, 6.
...Index, 7...Sprokeno 1, 8...
...Timing Bell 1/Q Names of the 111 substitutes Patent attorney Toshi Nakao and 1 other person
Name 2. -1 Figure ゛))

Claims (1)

[Claims] A plurality of core plates are provided with caulking protrusions on a part of the core plate, and the thickness of the laminated core is determined by intermittent punching control of the protrusions. A method of manufacturing a laminated iron core according to the present invention, wherein the positions of a plurality of plunging dies in the step of punching and caulking the core are replaced every predetermined fret stroke.