JPH068197A - Reforating method for ceramic green sheet - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to an apparatus for forming holes in a green sheet, and aims to improve the accuracy of hole position by making the shape of the die bush side of the green sheet uniform. [Structure] The present invention comprises a die for punching a green sheet and an air jet nozzle. [Effect] 1. The holes formed in the green sheet can be formed into a certain size and shape without breaking.
2. Since no stress is applied to the green sheet, the hole position accuracy can be improved without changing the green sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole forming process for a green sheet, and relates to a method for performing an optimum hole forming process for protecting a shape of a hole formed on a ceramic green sheet.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 61-63404, Japanese Patent Application No. 59-
184583, as in the hole punching method for ceramic green sheets, conventionally, the green sheet is moved by an XY table and positioned at a predetermined position, and then a plurality of punches are moved down to the bush to make holes. The scraps removed by drilling were collected by a suction device so that they would not get clogged in the formed holes.

[0003]

The prior art does not consider the shape of the hole formed by fitting the die bush and the punch. The punch fits into the die bush, and the punch outer dimension and die bush inner diameter dimension. Depending on the material of the green sheet, if the XY table moves in this state where biting occurs, the size and shape of the holes formed in the green sheet on the die bush side are destroyed. I will end up. Further, the stress due to this destruction may cause the green sheet to extend or generate fine processed powder of the green sheet. Since this processed powder is generated after the XY table is moved, it remains in the hole and is extruded when the conductor paste is filled in the subsequent process, resulting in poor conduction. Also, due to this extension, the hole sheet dimensional accuracy of the green sheet also deteriorates. There was a problem. The present invention is to solve the quality problem of these holes in the green sheet.

[0004]

In order to solve the above-mentioned problems, an air ejecting device is provided, and the ejection force of the air is made smaller than the punching force of the punch so that the green sheet is levitated except when the hole is descending. It was done.

[0005]

The air jetted from the air jetting device is directed to the die bush side surface of the green sheet, and the green sheet always floats from the surface on which the die bush is attached. When punching with a punch, the punching force of the punch is stronger than the floating force of the air of the green sheet, so that a hole is formed in close contact with the die bush surface. Since the green sheet and the die bush are in close contact with each other, the punched dust falls below the die bush. Even if the die bush and the green sheet stick to each other, the green sheet moves after it floats, so the processed hole is not destroyed. As a result, no stress is applied to the green sheet, so that the above problem can be solved.

[0006]

EXAMPLE An example of the present invention will be described below.

FIG. 1 shows a die for punching a green sheet. The mold consists of upper mold-1, lower mold-2, and upper mold-1.
The punch 3 for punching is set, and the driving device 4 is mounted on the upper part of the upper mold -1 so that the punch 3 can move up and down. A die bush-5 is set on the lower mold-2. Further green sheet-6
Is set between the upper mold-1 and the lower mold-2 and moved by the XY table-7. Further, an air jet nozzle-8 was provided. FIG. 2 is an enlarged view of a portion where the punch 3 and the die bush-5 are fitted to each other to make a hole in the green sheet-6. The punch-3 descends downward and comes into contact with the green sheet-6. Then, the punch-3 is formed in the die bush-5 to form a hole. At this time, the die bush-5 and the green sheet-6 interfere and bite. When the punch-3 has a hole, it is pulled up toward the upper mold-1 and the green sheet-6
When the holes are made, the air blows up due to the jetting force from the air jetting nozzle-8 and moves to XY in that state. Therefore, since the green sheet does not move while biting into the die bush, the hole is not destroyed.

[0008]

According to the present invention, since the green sheet can be punched without applying stress, the precision of punching can be improved. In addition, since the green sheet is moved while floating, it is possible to perform drilling without breaking the holes.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a green sheet punching device.

FIG. 2 is an enlarged view of a green sheet holed portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper mold, 2 ... Lower mold, 3 ... Punch, 4 ... Punch up / down drive device, 5 ... Die bush, 6 ... Green sheet, 7 ... XY table, 8 ... Air ejection nozzle.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Izumi Shimizu, No. 1 Horiyamashita, Hadano City, Kanagawa, Hitachi, Ltd., Kanagawa Plant, Hitachi, Ltd. (72) Takumi Miyamoto, No. 1, Horiyamashita, Hadano, Kanagawa Prefecture, Hitachi Computer Electronics Co., Ltd.

Claims (1)

[Claims] 1. A processing method comprising a punch for punching a ceramic green sheet and a bush having a size and shape equal to or larger than an outer diameter of the punch, and a predetermined hole is formed in the green sheet by fitting the punch and the bush. 2. A method for punching a ceramic green sheet, comprising: a mechanism for blowing air to the surface of the die bush so as to minimize the interference between the bush and the green sheet.