JPH0340933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a mold apparatus used for manufacturing multilayer capacitors by a frame method.

Conventional configurations and their problems In general, the frame method is adopted when manufacturing multilayer capacitors. Figure 1 shows the manufacturing process of a multilayer capacitor using the conventional frame method. First, as shown in Figure 1a, a green sheet 1 is pasted on a frame 2 with a square hole 3 in the center, and electrodes (not shown) are printed on this green sheet 1 to form a printed sheet. . Next, as shown in Fig. 1b, the printing sheet is placed on the pedestal 6 placed on the lower mold 5 of the pressure press mold, and the upper mold 4 of the pressure press mold is lowered to receive the printing sheet. In this case, a weak pressure is used for the temporary pressure contact with the table 6. Thereafter, temporary cutting is performed with a knife 7 to separate the frame 2 and the pressure-welded portion. Next, a printed sheet is placed on top of it and the above operation is repeated. By temporarily laminating the required number of green sheets in this manner, a temporary stack 8 of green sheets is obtained as shown in FIG. 1c. In this state, since the temporary laminate 8 is only temporarily welded and cut, the periphery of the temporary laminate 8 is not neatly aligned. Therefore, as shown in FIG. 1d, the excess portion 8a is cut off again using the knife 9 to fit the pedestal 6. Subsequently, as shown in FIG. 1e, the mold is placed between the upper mold 11 and the lower mold 10 of a compression press mold, and pressure is applied for final pressure contact. The pressing force in this case is stronger than the pressure at the time of temporary lamination. Therefore, if pressure is applied to the temporarily laminated green sheets as they are,
Because it protrudes into the surrounding area, block 1 the surrounding area.
2, fix it along the pedestal 6 and apply pressure. In this way, lamination is completed. FIG. 1f shows the completed laminated sheet, and although the thickness is thinner than when it was temporarily laminated, the outer shape has not changed. However, if a multilayer capacitor is manufactured using the above-described conventional method, cutting must be performed twice, which requires a lot of man-hours and is difficult to cut to fit the pedestal 6. It also has the disadvantage that it is difficult to automate production in large quantities.

OBJECT OF THE INVENTION An object of the present invention is to provide a mold device that can cut to the final required size and simultaneously perform temporary lamination.

Structure of the Invention In order to achieve the above object, the present invention provides a vertically movable cradle in a die into which a punch enters,
Each time a green sheet supported by a frame is punched with a punch and die, the pedestal is lowered and brought into contact with a stopper, and the pedestal is returned to its original position after punching the required number of sheets. It is characterized by the fact that

DESCRIPTION OF EMBODIMENTS FIG. 2 shows an embodiment of the mold apparatus of the present invention, in which a punching press mold is composed of a punch 13 and a die 14. As shown in FIG. This die 14 has a hole 14a having a cutting size, and a pedestal 15 that is movable up and down is provided in the hole 14a. Furthermore, this pedestal 1
Only the bottom surface of 5 and the distance dimension A are removed, and the stopper 16
has been established. Further, the side surface of the hole 14a of the die 14 is formed flat by a necessary dimension so that the pedestal 15 can slide thereon. The pedestal 15 has a thickness corresponding to the thickness of the sheet punched each time the punch 13 descends, or 2 to 3
It is configured to descend by a fixed amount each time. That is, the pedestal 15 is attached to the tip of a vertical bar 19, and the vertical bar 19 is configured to pass through a vertical plate 20 on which the stopper 16 is provided. Here, the upper and lower plates 20 operate so that at the same time as the pedestal 15 is lowered, the stopper 16 is also lowered while maintaining dimension A. Further, a counter 17 is provided which can set in advance the number of times the punch 13 repeats the vertical movement as many times as necessary, and is linked to the punch 13. On the other hand, the pedestal 15 is operated in conjunction with the punch 13 and at the same time is operated by a vertical rod 19 so that the punch 13 automatically returns to its original position after moving up and down a required number of times. At this time, the counter 17 and the stopper 16 also operate to return to their original positions at the same time.

In the mold apparatus having such a configuration, a plate 18 for stacking green sheets is arranged on the pedestal 15. At this time, the pedestal 15 and the upper and lower plates 20 are initially set so that the distance dimension A between the pedestal 15 and the stopper 16 is maintained, and the upper surface of the plate 18 is in contact with the green sheet 1 placed on the die 14. The position is set. Here, the green sheet 1 placed on the die 14 has electrodes printed on its surface, and the frame 2
It is supported by

The mold device that has been initialized in this way sets the number of punched sheets with the counter 18 and presses the counter 18 with the number of punched sheets.
When the green sheet 1 supported by the frame 2 is placed on the plate 18 placed above and the punch 13 is lowered, the green sheet 1 is placed between it and the die 14.
is punched out as shown in Figure 3a, and at the same time plate 1
8, the pedestal 15 descends to a position where it abuts against the stopper 16, and is pressed against the plate 18 by the punch 13, which is about to descend further. At this time, the punch 13 is adjusted so that it always descends with a constant pressure. Next, the punch 13 returns to its original position, but the pedestal 15 returns to a position lowered by the thickness of the punched sheet. If it goes down one step every 2 to 3 punches, it returns to the original initial setting position. Furthermore, the counter 17 moves by one scale. This operation is repeated until the image shown in FIG. 3b is reached as shown in FIG. 3c. Here, when the required number of sheets have been punched out, the pointer of the counter 17 becomes 0.
As shown in FIG. 3d, in order to take out the temporarily stacked sheets at the same time as punching, the pedestal 15 rises further above the initial setting position and returns to its original position. In this state, the pointer of the counter 17 returns to its original position in preparation for the next descent. The temporarily laminated sheets taken out in this manner are then subjected to the next main lamination, thereby completing the entire lamination work.

Note that in the above embodiment, the pedestal 15 is configured so that the plate 18 placed thereon can be taken out by returning it to its original position.
In addition, as shown in FIG.
1 may be used to push up the plate 18. Further, as shown in FIG. 5, it is also possible to use a cam 22 as a stopper instead of the stopper 16.

Further, although these series of operations can be performed mechanically, the power of each driving part can be easily controlled using a control box.

Effects of the Invention As described above, according to the present invention, temporary lamination can be performed at the same time as cutting, and workability and dimensional accuracy can be maintained. Furthermore, by adding a material supply/removal device, there is an advantage that automation can be easily achieved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the manufacturing process of a conventional multilayer capacitor, FIG. 2 is a sectional view showing an embodiment of the molding device of the present invention, FIG. 3 is an explanatory diagram of the operation of the same device, and FIGS. FIG. 5 is a sectional view showing another embodiment of the mold apparatus of the present invention. 1... Green sheet, 2... Frame, 13
...Punch, 14...Die, 14a...Hole, 15
... cradle, 16 ... stopper, 17 ... counter, 18 ... plate, 19 ... upper and lower bars, 20 ...
...upper and lower plates.

Claims (1)

[Claims] 1 A die with a hole for punching formed in the center,
a punch that moves up and down inside the punching hole in order to contact one or more green sheets with both ends in contact with the upper surface of the die and pressurize and punch the green sheet; a pedestal whose lower surface and its upper surface face each other and which descend and stop together with the punch when punching the green sheet; and a pedestal whose lower surface and its upper surface come into contact with each other when the pedestal is lowered and whose upper surface comes into contact when the pedestal stops. and a stopper that moves up and down to maintain a constant distance between the green sheet and the pedestal, and a plate that supports the stopper, and after punching the green sheet, the punch and the pedestal pressurize the green sheet,
The mold device is characterized in that the pedestal rises to the position when the first green sheet was punched out when the green sheets are successively punched out to reach a required number of layers.