JPH01150425A - Manufacturing device for laminated core - Google Patents

Abstract

PURPOSE:To manufacture a laminated core slightly sliding the end face of a core piece by forming the hole part in larger diameter and the raise part in smaller diameter on plural core pieces and engaging in order the raise part of the other core piece with the hole part of the core piece. CONSTITUTION:An upper die 20 is elevated, a cam 124 is rotated by a step motor 123, the cam face is moved to R1 from R7 and a lamination die 12 is moved to the terminal end position of the left part. The through hole 2 of diameter D1 is formed by a weighing punch 21 on an initial 1st core piece 1a with the descent of the upper die 20 and drawn into the lamination die 12 by a punch 50. The cam face is moved to R2 from R1 by the motor 123 by ascending the upper die 20 and the lamination die 12 is slid to the right part by the differential part in the large diameter D1 of the hole part 1b and the small diameter D2 of the raise part 1a. The hole part 1b and raise part 1a are then formed on a 2nd core piece 1b by punch 23 and die 11 and the core pieces 1a, 1b are laminated by drawing into the lamination die 12. This operation is executed in order on the plural core pieces and the laminated core of a magnetic head, etc., whose core piece end part is slid in order is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for manufacturing a laminated core used in a magnetic head or the like.

(Prior art) Conventionally, such laminated cores have been developed, for example, in Japanese Patent Application Laid-open No. 6
As shown in Japanese Patent No. 2-75908, a device in which a plurality of magnetic hemlock core pieces are integrally laminated by means of attaching them to each other, that is, caulking means is known. In such conventional laminated cores, caulking was performed only in the vertical direction. Therefore, when forming the end face of the laminated core, that is, the running surface of the tape, etc., at an angle, the end face must be shaped by grinding, and as a result, the area serving as the running surface differs for each core piece, resulting in magnetic properties. However, it has the disadvantage of causing a deterioration in electrical characteristics. Therefore,
Recently, in order to prevent such deterioration of magnetic properties or electrical properties, it has become necessary to stack and fix each core piece by slightly shifting it in a predetermined linear direction.

(For example, about 0.01mm or 0.05mm).

(Problems to be Solved by the Invention) However, in response to such a request, the conventional caulking lamination method described above could only stack vertically. For this purpose, first, core pieces are punched out one by one using a press mold, the required number of pieces are counted, and then the required laminated cores are stacked by hand by shifting them by a predetermined amount, and then fixed with adhesive etc. to obtain the required laminated core. was. Therefore, it is necessary to prepare a special jig for laminating, which is very troublesome and requires a lot of effort and time. Furthermore, there is a risk that the adhesive may peel off during grinding after lamination.

(Object of the invention) The present invention was made to solve such problems,
The object of the present invention is to provide an apparatus for integrally manufacturing a laminated core of a magnetic head or the like as described above in a mold.

(Means for Solving the Problems) Therefore, in the present invention, in a progressive mold device, the outer dimension of the punch forming the caulking means for locking adjacent core pieces is formed larger than the inner dimension of the die, and the laminated By moving the die in a predetermined linear direction within the range of the dimensional difference between the punch and the die for each press stroke, a predetermined number of core pieces are inserted into the progressive die using the caulking means, one core piece at a time. This is an attempt to solve the above-mentioned problem by laminating and fixing the sheets slightly shifted in a predetermined linear direction.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail by way of example with reference to the drawings.

FIG. 1 is a schematic explanatory diagram showing a product cross section of a laminated core manufactured according to the present invention, in which N core plates 1 are caulked and laminated with each one being slightly shifted by a cut-and-raise protrusion 3 for caulking. , the first core piece 1a has a through hole 2 formed therein, and the second and subsequent core pieces 1b to 1n, that is, N-
One of the cut and raised protrusions 3 of the core pieces 1b to 1n is set by adjusting the outer dimension DI of the cut and raised portions 3a... to the hole 3.
b...The inner dimension is larger than D2, and the sheets are stacked as shown in FIG. 1 while being shifted by a predetermined amount within the range of this size difference (DI - D2). In the figure, the through hole 2 is formed to have the same size (Dl) as the cut and raised portion 3a.

Next, a mold apparatus for manufacturing such products will be described.

2 to 4 show an example using a progressive mold for manufacturing a laminated core. In the figures, 10 is a lower die device, 20 is an upper die device that is movable up and down, and 30 is an upper and lower die device of the upper die device 20. It is a stripper that moves in conjunction with the movement of the stripper, and has a structure in which the vertical movement is guided by a guide post 40. Also, 21 in the figure
1 is a measuring punch that punches out the engaging through hole 2 of the core piece 1a shown in FIG.
It is equipped with. Furthermore, 23 is the adjacent core piece 1
...Cut and raised protrusions 3 for caulking and joining each other.
It is a punch for half-blanking to form . Further, 11 is a die corresponding to the half-blanking punch for forming the above-mentioned cut-and-raised protrusions 3, and as shown in FIG. It is designed to be large and installed. Therefore, the shape of the cut-and-raised portion is approximately 172 mm thick. 50 is a punch for punching out the outline, and 12 is a laminated die corresponding to the punch 50 for punching out the outline. As shown in FIG.
2a and the surface 12b) is formed to be a sufficient length with respect to the length of the punch 50 for punching out the outer shape, that is, to be larger than the maximum movement amount. Therefore, the core piece 1 drawn out by the punch 50 for punching out the outer shape is
c) and the surface 12d) and are caulked and laminated.

A linear direction moving device (shifting means) 120 provided on the lower die side is connected to this stacked die 12. This linear direction moving device will be explained. The stacking die 12 is connected to a rod 122 integrated with a cam follower 121, and the cam follower 121 is in contact with a surface of a cam 124 attached to the output shaft of a step motor 123. This cam 124 has cam surfaces formed at equal intervals with distances from the center ranging from 91 to 1 to 7, each corresponding to the amount of movement.The step motor 12 operates in synchronization with the press stroke.
The amount of linear movement due to the predetermined rotation of cam follower 12
1 as the movement of the stacked die 12. In this example, R1-R2=R
2-R3=1'? 3- R4= R4-R5= R5-
1?6=R6-R7-shift amount α. Further, a compression spring 125 is disposed in the lower mold 1 on the side opposite to the connecting side of the rod 122 of the laminated die 12, and normally presses the laminated die 12 in one direction (towards the cam). Note that the cam 123 is configured to be replaced when the amount of displacement is changed.

Next, the operation of the apparatus of this embodiment will be explained with reference to FIGS. 2 and 4. As can be seen from the cam shape, the device of this embodiment is a seven-sheet stacking device, and the state in which the seventh sheet is pulled out in the final step (c) is shown. At this time, when the upper die reaches the rising end, the step motor 123 is rotated at a predetermined angle (360
/7°). Is the cam surface of cam 124 I? 7 to R1, the stacked die 12 moves to the leftmost position against the compression spring. Then, the upper die is lowered, and the first core piece having the through hole is pulled into the stacking die 12 and positioned on top of the previously stacked core pieces. Next, when the upper mold reaches the rising end, the step motor 123 is rotated by a predetermined angle (360/7°), and the cam surface of the cam 124 is turned to R.
1 to R2. Then, the stacked die 12 moves to the right by R1-R2. Therefore, the next core piece to be drawn into the laminated die 12 and the previously drawn core piece are shifted in the linear direction by R1-R2, that is, by the above-mentioned shift α. In this way, a predetermined number of sheets from the second sheet onward are laminated and caulked to form a product.

In the above embodiment, the linear direction moving device (shifting means) 1
Although an example of a combination of a step motor and a cam is shown as No. 20, the cam is not limited to this; for example, it is also possible to rotate the cam directly or indirectly with a control motor, and it is also possible to rotate the cam directly or indirectly with a control motor. Of course, the same effect can also be achieved by connecting the die to the laminated die and controlling the amount of expansion and contraction electrically.

Further, the direction in which the core pieces are shifted using the linear direction moving device 120 can be parallel to or perpendicular to the core plate feeding direction of the mold as shown in FIG. 2. Further, the amount of shift can be easily adjusted by replacing the cam within the range of the difference in dimension between the outer dimension of the punch and the inner dimension of the die forming the aforementioned caulking means.

Of course, it goes without saying that the number of laminated sheets can be easily changed by replacing this cam.

(G) 0 Effects of the Invention With the above structure, a laminated core of a magnetic head, etc. is manufactured using a progressive mold, and a predetermined number of iron core plates are caulked in the mold, and each iron core plate is separated. It is now possible to laminate and fix the core by slightly shifting it in a predetermined linear direction, so there is no need for a special jig compared to the past, and the laminated core with a slight shift in the linear direction can be easily achieved, making it possible to easily create a laminated core with a slight shift in the linear direction, etc. When the end faces are ground for this purpose, the areas serving as the running surfaces of each core piece can be made approximately equal, making it possible to provide products with excellent electrical and magnetic properties.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a product cross section of a laminated core manufactured according to the present application, FIGS. 2 to 4 are examples using a progressive mold for manufacturing the laminated core, and FIG. FIG. 3 is an explanatory diagram showing a state in which a cut-and-raised protrusion for caulking connection is formed, and FIG. 4 is a partial cross-sectional view of the linear moving device ( Fig. 3 shows explanatory diagrams of the shifting means). (Explanation of symbols) 12...Laminated guide 120...Linear direction moving device (shifting means) 121.
...Cam follower 122...Rod 123...
Step motor 124...Cam 125...Compression spring Fig. 1

Claims (5)

[Claims] (1) In the progressive mold device, the outer dimension of the punch that forms the caulking means for securing adjacent core pieces is formed larger than the inner dimension of the die only in a predetermined linear direction, and the laminated die is pressed during the press stroke. By moving in a predetermined linear direction within the range of dimensional difference between the punch and die,
A laminated core manufacturing apparatus characterized in that a predetermined number of core pieces are laminated and fixed in a progressive mold using the caulking means so that each core piece is slightly shifted in a predetermined linear direction. (2) The laminated core manufacturing apparatus according to claim 1, wherein the shifting direction is parallel to the core plate feeding direction of the mold. (3) The laminated core manufacturing apparatus according to claim 1, wherein the shifting direction is perpendicular to the core plate feeding direction of the mold. (4) The manufacturing apparatus according to claim 1, wherein the means for moving the laminated die in a predetermined linear direction for each press stroke is a cam indexing device that is interlocked with the press stroke. (5) The manufacturing apparatus according to claim 1, wherein the means for moving the laminated die in a predetermined linear direction for each press stroke is a piezoelectric actuator connected to the laminated die.