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Tungsten Carbide Die and Process for Making the Same

IP.com Disclosure Number: IPCOM000095553D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Brearly, DW: AUTHOR [+2]

Abstract

Durability is realized when dies for punching rectangular holes into cards are made from tungsten carbide.

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Tungsten Carbide Die and Process for Making the Same

Durability is realized when dies for punching rectangular holes into cards are made from tungsten carbide.

In this method for making dies, the die apertures are defined by tungsten carbide surfaces. First, channel 12 is formed in base 10 of a softer metal and ejection holes 14 are drilled in floor 13 of the channel. Then, rectangular blocks 16 of tungsten carbide are brazed in spaced relationship upon bar 18 of a softer metal. Their confronting end surfaces 24 and their side surfaces 28a and 28b are ground to correspond precisely to the desired dimensions for the length and width, respectively, of the die apertures.

The resulting component is placed in channel 12 with its blocks 16 resting upon floor 13 at either side of the ejection holes 14. Bars 32a and 32b of tungsten carbide are placed at either side of blocks 16. Wedge 34 of a softer metal is driven into the space between bar 32b and the adjacent side wall of the channel to hold the various components in their proper position. Finally, bar 18 is removed by grinding. The result is a die having apertures 20 that are defined entirely by tungsten carbide surfaces, yet have sharp corners and are precisely dimensioned.

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