JP3153143B2 - Sublimation sheet piece filling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for holding a cavity having a predetermined volume formed in a green sheet in a predetermined shape when manufacturing a green sheet laminate. And a method for efficiently filling such a cavity with an interposer composed of a sublimable substance.

[0002]

2. Description of the Related Art Conventionally, unfired green sheets are superimposed so that a predetermined cavity is formed therein, while unfired electrodes are appropriately arranged, laminated, and integrated.
A stacked structure in which a predetermined electrode was allowed exposed to the cavity by firing it, for example an oxygen sensor, NO _X sensor electrochemical cell used in such is produced.

An example thereof will be described with reference to FIG. 4. Referring to FIG. 4, a green sheet 10a made of a single solid electrolyte having an outer electrode 12 and an inner electrode 13 on both surfaces, and a cutout window-shaped cavity 11 are provided. When the green sheet 10b as a spacer and the flat plate-shaped second electrolyte green sheet 10c are stacked under pressure, each green sheet 10a,
A space surrounded by b and c and having the inner electrode 13 exposed is formed.

[0004] Such a laminated structure sinters at a predetermined sintering temperature and develops sufficient strength. However, a space of a predetermined shape is deformed during the above-mentioned pressurization and lamination, and in particular, the sheet 10 is deformed.
a and 10c are easily deformed such that they bulge inwardly. When the volume of the space changes in this way, the electrochemical constant changes, and a quality problem occurs that the sensor performance is not constant. Therefore, the volume of the space is prevented from changing during pressurization and lamination. As a means, a method of filling an interposer composed of a sublimable substance having the same shape as the space and sublimating it in a baking operation, and eliminating it, is disclosed in, for example, JP-A-60-135756. It has been developed as disclosed in the manufacturing method.

[0005] The sublimable substance used for this interposer is prepared mainly from theobromine, indigo, hexabromobenzene or naphthacene, which is hardly soluble in organic solvents such as ether often used for green sheets. You. For example, 100 parts by weight of theobromine (the same applies hereinafter), 10 parts of polyvinyl butyral, 200 parts of trichloroethylene, and 6 parts of dioctyl phthalate are used as a slurry, a 0.8 mm thick sheet is formed by a doctor blade method, dried, and then appropriately sized. To obtain a 0.6 mm-thick dry sheet-like sublimable interposer. After this was fitted into the cutout window-shaped cavity 11 shown in FIG. 4, the electrolyte sheet 10a, the spacer sheet 10b,
If the second electrolyte sheet 10c is laminated while being pressed, the shape of the portion where the space is to be formed will not be deformed. Then, the sublimable interposer sublimates and disappears in the firing operation, so that a space having a predetermined shape and volume can be obtained.

In such a conventional method of laminating green sheets, a sheet-like sublimable interposer having a main component such as theobromine is manually fitted into the cavity 11 using a jig such as tweezers. This sublimable interposition material had a thickness of 0.20 to 0.20
In addition to the thinness of about 0.25 mm, it is poorly flexible and brittle, so it is easy to be damaged, and the green sheet is easily scratched. As a result, there is a quality problem such as defective products, and one green sheet. 30 cavities 11 per
Is set, there is also a problem in cost such that it is difficult to reduce the number of steps so that the filling operation time requires about 15 minutes.

The laminated structure is not manufactured for each cavity 11 as shown in FIG. 4, but is usually formed on a single green sheet surface as shown in FIG. A large number (four in FIG. 5), and if there are many, several tens of cavities 11 are juxtaposed, and a large number of spatial structures are formed at the same time to increase the production efficiency. The method of filling the sublimable interposer having various problems has caused a decrease in the overall production efficiency.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises stacking unfired green sheets so that a predetermined space is formed therein.
When manufacturing a laminated structure obtained by sintering, the space formed in the green sheet is not abnormally deformed in the process of forming the laminate, and is a sublimation interposer for maintaining a predetermined three-dimensional shape. Provided is a method for filling a sublimable sheet piece, which can reduce the man-hours, automate the work, and also prevent damage to the sublimable interposer, thereby improving the quality. .

[0009]

[Means for Solving the Problems]

[0010]

[0011] The above problem is caused by interposing a sublimable sheet between a plurality of punches and a metal mask arranged corresponding to the arrangement positions of a plurality of cavities formed on the green sheet surface, and pressing the sublimation sheet with the punch. Then, a plurality of sublimable sheet pieces having a predetermined shape corresponding to the planar shape of the cavity are continuously punched out as being arranged corresponding to the cavity, and the sublimable sheet pieces are each punched with the punch. the method of filling sublimable sheet pieces, characterized in that filling and pressing in the cavity at the same time, to solve than two
be able to.

Further, the present invention provides a sublimation sheet in which precuts having a predetermined contour shape corresponding to a plane shape of a plurality of cavities formed on the surface of a green sheet are formed in a predetermined arrangement and at intervals, and the sublimation sheet is provided in plural. Interposed between the individually arranged punches and the green sheet, the punches punch out sublimable sheet pieces along the precut of the predetermined shape, and simultaneously fill the respective cavities. A method for filling a sublimable sheet piece can also be embodied.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will now be described with reference to FIGS. First, in FIG. 1, a spacer green sheet 10b in which a plurality of cavities 11 of a predetermined shape are formed is combined and laminated on the upper surface of one green sheet 10c having a thickness of about 0.2 mm. , And a suction metal plate 2 made of a sintered metal is disposed above the metal plate so as to be movable horizontally and vertically. As the cavity 11,
For example, a plurality of cavities having different sizes of about 0.5 to 2 mm in length and about 2 to 7 mm in width may be arranged as many as 30 or more per sheet. Here, the desired cavity 1 is removed from the sublimable sheet 3 (not shown) by a suitable punching device, for example, punching (not shown).
Sublimation sheet pieces 31 having a predetermined shape following the planar shape of 1 and the same number as the cavities are stamped and formed at predetermined intervals.

Next, the same number of sublimable sheet pieces 31 as the obtained cavities are adsorbed to and adhered to the adsorption plate 2. In this case, the sublimable sheet pieces 31 need to be adsorbed and arranged at positions corresponding to the target cavities 11. Next, by lowering the suction disk 2 and pressing the green sheet 10b, and simultaneously filling the plurality of sublimable sheet pieces 31 into the plurality of cavities 11, as shown in the right side view of FIG. A laminated green sheet in which the sublimable sheet piece 31 is integrated in the cavity 11 can be obtained. Then, it is possible to proceed to a step of laminating a covering green sheet (not shown) on the filled laminated sheet.

According to the method for filling sublimable sheet pieces of the present invention, a predetermined number of sublimable sheet pieces having a predetermined shape can be formed without individually manually filling the cavities with the sublimable sheet pieces. Since you can handle pieces at the same time,
Advantageously, the number of steps for the filling process can be significantly reduced, and each operation can be automated. In addition, since partial stress is not applied to the sublimable sheet piece having poor flexibility, it is possible to prevent the sublimation sheet piece from being damaged, and there is an advantage that the finished quality of the green sheet laminate itself can be improved. In this case, if an adhesive layer is printed on the surface of each green sheet in advance or an adhesive solvent is applied, the lamination between the green sheet and the sublimable sheet piece or between the green sheets is performed. Is more firmly formed, and in particular, the filled sublimation sheet piece is not peeled off or dropped off, which is preferable.

Here, for the following preferred embodiment,
A description will be given based on FIG. In this case, as above,
A green sheet 10b, in which a plurality of cavities 11 of a predetermined shape are formed, is stacked on the upper surface of the green sheet 10c and placed on the set table 4, and a punching device 5 having a punch 51 is provided above the green sheet 10b. Are arranged to be able to move up and down freely. The shape of the punching surface of the punch 51 is formed in accordance with the target planar shape of the cavity 11 and is arranged at the same interval. Further, on the upper surface of the green sheet 10b, a metal mask 53 made of a SUS thin plate having a cavity formed in accordance with the planar shape of the cavity 11 is set.

Next, in this embodiment, the sublimation sheet 3 is arranged between the arranged punches 51 and the metal mask 53, and the punch 51 is lowered and pressed to press the cavity. It is possible to punch a predetermined number of sublimation-made sheet pieces 31 corresponding to the arrangement of the cavities 11 in a state corresponding to the arrangement of the cavities 11. Then, subsequent to the punching step, the punch 51 can be further pressed downward to fill the plurality of sublimable sheet pieces 31 into the plurality of cavities 11 at the same time. In this case, a stripper 52 is arranged above the sublimation sheet 3, the stripper 52 is used as an upper mold, the metal mask 53 is used as a lower mold, and the sublimation sheet 3 is sandwiched from above and below to form a sublimation sheet. It is preferable to prevent the sheet 3 from shifting and to ensure the punching operation.

According to this embodiment, in addition to the above-described functions and advantages, a punching operation for punching a sublimable sheet piece and a filling operation for filling it into a cavity are performed continuously. Further, in addition to the reduction in the number of processing steps, there are obtained advantages such that related necessary mechanical devices can be efficiently and integrally arranged.

Further, the present invention can be embodied as shown in FIG. In this case, the previous embodiment (FIG. 2)
Although the metal mask 53 used in the sublimation sheet 3 is not required, the green sheet 1
Precut portions having predetermined shapes corresponding to the planar shape of the cavities 11 formed on the 0b plane are formed in advance by forming precuts 32 such as cuts in the contours thereof, and are arranged at intervals corresponding to the arrangement of the cavities 11. It is. Such a pre-cut 32 provided in advance can be obtained by forming an infinite number of fine holes like perforations, or by forming a cut that does not connect to the front and back.

The sublimation sheet 3 thus prepared is interposed between a plurality of arranged punches 51 and the green sheet 10b, and when the punch 51 is lowered, the precut 32 having the predetermined shape is formed. A predetermined number of the sublimation-made sheet pieces 31 can be punched out along with and can be simultaneously filled in the cavity 11. In FIG. 3, the stripper 52 shown in FIG. 2 is omitted, but this can be used as needed. In this embodiment, although the number of pre-cut processing steps such as cuts of a predetermined shape is increased as compared with the previous embodiment, the production of the relatively expensive metal mask 53 becomes unnecessary, and the operation of attaching and detaching the metal mask 53 is also omitted. There are advantages that are unnecessary.

[0021]

The method for filling a sublimable sheet piece according to the present invention comprises:
Since it is configured as described above, the man-hours for the filling process, for example, when the number of cavities per one green sheet is 30 is shown. Can be remarkably shortened so that it can be completed in only a few seconds, and at the same time, automation can be performed in conjunction with the mechanization of the preceding and succeeding steps, thereby enabling a great rationalization. In addition, since the sublimation interposition material can be prevented from being damaged, there is an excellent effect that the finished quality of the green sheet laminate itself can be improved. Therefore, the present invention has a very large industrial value as a method for filling a sublimable sheet piece which has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a schematic view of an arrangement of related devices for explaining an embodiment of the present invention.

FIG. 2 is a schematic view of the arrangement of related devices for explaining another embodiment.

FIG. 3 is a schematic view of the arrangement of related devices for explaining still another embodiment.

FIG. 4 is an exploded view of a laminated state of a green sheet.

FIG. 5 is a perspective view showing a cavity of a green sheet.

[Explanation of symbols]

10a, 10b, 10c green sheet, 11 cavities, 2 suction plates, 3 sublimation sheets, 31 sublimation sheet pieces, 32 precuts, 4 sets, 51 punches,
52 stripper, 53 metal mask.

Claims (2)

(57) [Claims] 1. A sublimation sheet is interposed between a plurality of punches and a metal mask arranged corresponding to an arrangement position of a plurality of cavities formed on a green sheet surface, and pressed by the punch, Continuing to the step of punching out a plurality of sublimable sheet pieces having a predetermined shape corresponding to the planar shape of the cavity as being arranged corresponding to the cavity, the punch is used to put the sublimable sheet pieces into each cavity. And filling at the same time. 2. A punch in which precuts having a predetermined contour shape corresponding to a planar shape of a plurality of cavities formed on a green sheet surface are formed at predetermined arrangement intervals on a sublimation sheet, and a plurality of the sublimation sheets are arranged. And the green sheet is interposed, and the punch is used to punch out the sublimable sheet pieces along the pre-cut of the predetermined shape, and simultaneously fill the respective cavities with the sublimable sheet pieces. Filling method.