Browse Prior Art Database

Air Spring Programmable Via Punching Head

IP.com Disclosure Number: IPCOM000081322D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Kranik, JR: AUTHOR [+2]

Abstract

This "air spring" punch head provides a method of perforating small (<0.009'') diameter vias (holes) in unfired ceramic sheet with "micro" tungsten carbide punches. This concept represents a refinement of a known technique employed for large diameter via punching, and involves the use of a metal programming mask (interposer) containing clearance holes in the via configuration desired. The program mask is used in conjunction with a punch head containing a multiple of punches, preloaded with mechanical springs. By moving the ceramic sheet and interposer in unison under the punch head, the ceramic sheet is selectively perforated with the desired via pattern.

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Air Spring Programmable Via Punching Head

This "air spring" punch head provides a method of perforating small (<0.009'') diameter vias (holes) in unfired ceramic sheet with "micro" tungsten carbide punches. This concept represents a refinement of a known technique employed for large diameter via punching, and involves the use of a metal programming mask (interposer) containing clearance holes in the via configuration desired. The program mask is used in conjunction with a punch head containing a multiple of punches, preloaded with mechanical springs. By moving the ceramic sheet and interposer in unison under the punch head, the ceramic sheet is selectively perforated with the desired via pattern.

Extension of the above concept to the much more delicate "micro" size via punching is accomplished, by replacing the mechanical punch preload springs with a pneumatic or air spring system. This concept greatly minimizes potential punch breakage and associated tool downtime.

The air spring punch head is depicted in the drawing. The punch head contains four major components: the upper head assembly 1, the stripper or pressure plate 2, the die 3, and the punches 4. Also shown is the programming plate 5 located above the ceramic sheet 6. A hardened steel actuator ball 7 is spaced a small distance (0.002'' - 0.004'') above each punch 4. Each ball 7 contains a constant preload provided by air pressure applied to the chamber formed above it, by a thin flexible diaphragm 8. The...