Browse Prior Art Database

Tubular Armature Laminating Fixture

IP.com Disclosure Number: IPCOM000080255D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Karol, KN: AUTHOR

Abstract

This fixture is usable in practicing the method of laminating a tubular motor armature, as described in U. S. Patent 3,650,021. The fixture laminates two printed-circuit cards into an integral hollow tube by differential expansion, which occurs during an elevated heat cycle. The fixture closely controls the armature's inner diameter and is constructed to prevent excessive lamination pressure.

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Tubular Armature Laminating Fixture

This fixture is usable in practicing the method of laminating a tubular motor armature, as described in U. S. Patent 3,650,021. The fixture laminates two printed-circuit cards into an integral hollow tube by differential expansion, which occurs during an elevated heat cycle. The fixture closely controls the armature's inner diameter and is constructed to prevent excessive lamination pressure.

Aluminum mandrel 10 is shown in end view. The armature's printed-circuit cards, no shown, are wrapped about this mandrel in annular cavity 11. The mandrel is constructed so that its outer diameter is slightly smaller than the desired inner diameter of the tubular armature. Due to the accurately predictable expansion characteristics of material such as aluminum, the temperature of the heat cycle can be selected to insure that the mandrel 10 will expand to establish the armature's inner diameter to a close tolerance.

The fixture's two-piece outer shell 12 includes a number of high-expansion members 13 which are constrained so that all expansion thereof is directed inward, to force the cards down onto the hot and now expanded mandrel 10. To insure that excessive lamination pressure does not result, each of the members 13 is formed with a strain relief portion in the form of a cavity 14. These cavities function as a strain relief portion by gradually collapsing, if the lamination pressure becomes excessive. As a result, members 13 continue to...