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Mechanical Programmed Punching

IP.com Disclosure Number: IPCOM000090129D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Ghez, J: AUTHOR [+4]

Abstract

In ceramic multilayer circuit manufacturing, green ceramic sheets with a soft plastic consistency are punched. These sheets carry electrical conductors and, due to an array of filled via holes, electrical paths from one side to the other can be established. Holes, a few mils in diameter, have to be punched, making up a pattern with a tiny grid. The tool assembly is essentially made up with an array of punching pins, one pin per potential hole site, maintained parallel in a matrix where they can freely move through with a +/- 2 mil clearance. To obtain a hole pattern in a green sheet placed underneath the matrix, some pins must be pressed down. The remainder are kept at the high position. Pins are actuated by a program mask of which the holes correspond to pins located at sites where no hole must be punched in the sheet.

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Mechanical Programmed Punching

In ceramic multilayer circuit manufacturing, green ceramic sheets with a soft plastic consistency are punched. These sheets carry electrical conductors and, due to an array of filled via holes, electrical paths from one side to the other can be established. Holes, a few mils in diameter, have to be punched, making up a pattern with a tiny grid. The tool assembly is essentially made up with an array of punching pins, one pin per potential hole site, maintained parallel in a matrix where they can freely move through with a +/- 2 mil clearance. To obtain a hole pattern in a green sheet placed underneath the matrix, some pins must be pressed down. The remainder are kept at the high position. Pins are actuated by a program mask of which the holes correspond to pins located at sites where no hole must be punched in the sheet. That is, the mask pattern is a complementary replica of the desired pattern.

A green sheet of ceramic is laid down on steel matrix 4. Pin restorer plate 3 and the pin guide plate 2 are driven down to the sheet. Program mask 1 is inserted, and is pressed down and punching takes place. Then mask 1 is removed. Restorer 3 is used to extract pins to the high position. The punched ceramic sheet is withdrawn.

The metal plates used in this operation, pin restorer plate 3 and pin guide plate 2, plus a set of program masks, one per layout, are needed. To solve the difficulty of obtaining metal plates with thousands of holes ve...