Browse Prior Art Database

Processing Aperture Blanks

IP.com Disclosure Number: IPCOM000042499D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Moore, GW: AUTHOR [+2]

Abstract

This article describes an apparatus for providing improved aperture blanks for use in printed circuit board manufacture. A one-step operation punches locator holes and separates excess film from the blank. The primary advantage of this one-step, dual-function operation is the elimination of tolerance build-up which currently occurs during the two-step punch and subsequent shear operations. The yield of aperture blanks is improved as a result of tolerance build-up elimination. This is important since inaccurate registration between the punching and shearing steps interferes with operations. The apparatus described provides a less expensive alternative to drilling metal apertures. The tool consists of a hand operated pump 4 and punching shear die 6.

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Processing Aperture Blanks

This article describes an apparatus for providing improved aperture blanks for use in printed circuit board manufacture. A one-step operation punches locator holes and separates excess film from the blank. The primary advantage of this one-step, dual-function operation is the elimination of tolerance build-up which currently occurs during the two-step punch and subsequent shear operations. The yield of aperture blanks is improved as a result of tolerance build-up elimination. This is important since inaccurate registration between the punching and shearing steps interferes with operations. The apparatus described provides a less expensive alternative to drilling metal apertures. The tool consists of a hand operated pump 4 and punching shear die 6. A spring-biased stripper plate 8 is provided to assist in removing the blank from the punches. In operation, raw material is placed on the punch area. Material may be inserted from three different directions. Once material is properly positioned, pump handle 10 is pulled to bring down the die and punches. Material pressed against the shaper die 6 is punched and sheared in a precise manner.

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