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Browse Prior Art Database

UNIVERSAL POLYBENT BENDING NEST

IP.com Disclosure Number: IPCOM000009361D
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-20
Document File: 3 page(s) / 138K

Publishing Venue

Motorola

Related People

David Fiedler: AUTHOR

Abstract

The Polybent process, described in US Patent 5,170,326 (Dec. 8, 1992), required a custom machine, known as a Polybend Cell, to fold metal backed flexible primed wiring board around a hous- ing. During the first three generations of Polybent products there was a custom machine created for each product. However, with production require- ments continually changing, the need to create a machine that would fold any Polybent product was pursued.

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Page 1 of 3

MOTOROLA Technical Developments

UNIVERSAL POLYBENFM

BENDING NEST

by David Fiedler

  The Polybent process, described in US Patent 5,170,326 (Dec. 8, 1992), required a custom machine, known as a Polybend Cell, to fold metal backed flexible primed wiring board around a hous- ing. During the first three generations of Polybent products there was a custom machine created for each product. However, with production require- ments continually changing, the need to create a machine that would fold any Polybent product was pursued.

  The heart and soul of a polybend cell is the bend nest. The bend nest aligns a board and a housing together and holds their bend lines parallel to a brake die. The bend nest also includes the brake die and its axis of rotation around the bend nest for the

first and second 90 degrees bends. The bend nest design contains two aspects of tooling, one, the por- tion of the nest that is specific to the product and two, the portion that is universal to all products.

  Product specific tooling is required to allow a housing and board to locate onto product specific alignment pins without 'interfering with another product's alignment pins. In addition, each housing has to be clamped to the'iboard before bending can be started. The clamps must hold the housing with- out interfering with the board as it folds around the housing. To accomplish this the clamps only engage the lip of the housing. The figure below shows a product specific tool used in the Universal Bending Nest.

Fig. 1

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MO7WROLA Technical Developments

  The clamps, shown with handles attached to them to lift and carry the tooling, are shown in their clamped position. The clamps actually fall and rest in cutouts on the bend nest tooling due to their own weight when not being actuated. The angle the clamps sit at when at rest allow a board and housing to be vertically lowered into the nest without inter- fering with the clamps. The position of the clamps'pivot and pivot block act like a fulcrum to amplify the force applied by an air cylinder to the end of the clamps. As product sizes increase or decrease the pivot and pivot block can be moved to create the same clamp force from the same clamp cylinder pressure while maintaining the same bend nest plate size.

  The second bend position is performed by low- ering the pro...