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Progressive Gang Punch

IP.com Disclosure Number: IPCOM000077279D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Kranik, JR: AUTHOR [+2]

Abstract

This progressive gang punch provides a method of punching many closely-spaced holes in green ceramic sheet, while requiring a fraction of the actuating force employed in conventional gang punching. Punching is accomplished with high repeatability and greatly reduced die deflection and shock loading. A convenient method of programmability is included to allow for grid pattern variations.

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Progressive Gang Punch

This progressive gang punch provides a method of punching many closely- spaced holes in green ceramic sheet, while requiring a fraction of the actuating force employed in conventional gang punching. Punching is accomplished with high repeatability and greatly reduced die deflection and shock loading. A convenient method of programmability is included to allow for grid pattern variations.

The machine comprises a punch head 1, die 2, pressure plate 3, matrix of punch assemblies 4, and rubber covered roller 5 which acts as an "in-line" actuator. An enlarged view is shown of an individual punch assembly 4. A typical headed punch 6 is shown containing return springs 7. The punch is actuated by the roller 5 through a steel ball 8 which controls punch travel, while providing negligible punch side loading. By fabricating the roller covering from two or more different hardnesses of rubber, a combination of spring rates are obtained providing controlled punch acceleration and force. The reduction in actuating force provided by the progressive punching scheme, permits relaxation of machine member strength requirements and reduces the chances of punch breakage.

Punch operation is as follows: (a) the punch head 1 is raised on accurate guide pins 9; (b) the ceramic sheet 10 is put into place; (c) the punch head 1 is lowered into place - the pressure plate 3 securing the sheet; and (d) the roller 5 "scans" the top of punch head 1 perforating a hole in the...