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METHOD OF ULTRASONICALLY WELDING RIM PARTS USING THERMOPLASTIC INSERTS

IP.com Disclosure Number: IPCOM000007739D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-18
Document File: 2 page(s) / 87K

Publishing Venue

Motorola

Related People

Steven D. Pratt: AUTHOR [+3]

Abstract

Typical assembly methods for Reaction Injec- tion Molded (RIM) and other thermos& parts include such techniques as screws and other hardware, adhe- sives, and integrally molded geometric features such as snap- and press-fits. These techniques suffer horn a number of problems, The use of screws and other assembly hardware add to the total part count and cost, add to the overall weight of the product, and usually require labor intensive processes in their implementation. The use of adhesives give rise to environmental concerns, and ohen times the adhe- sives chemically attack the parts onto which they are applied, resulting in a degradation of the mate- rial properties of the parts. Adhesives can be diffi- cult to dispense, so their use in a product's assem- bly can add to the cost and complexity of the manufacturing lines required to assemble the prod- uct, Integrally molded assembly features such as snap- fits and press-fits are conducive to automated assem- bly processes, but their use in designs adds to the cost, cycle time, and maintenance required for the molding tools used to produce the parts.

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MOlYlROLA Technical Developments

METHOD OF ULTRASONICALLY WELDING R!,M PARTS USING THERMOPLASTIC INSERTS'

by Steven D. Pratt, Steve Hunt and Bob Pennisi

  Typical assembly methods for Reaction Injec- tion Molded (RIM) and other thermos& parts include such techniques as screws and other hardware, adhe- sives, and integrally molded geometric features such as snap- and press-fits. These techniques suffer horn a number of problems, The use of screws and other assembly hardware add to the total part count and cost, add to the overall weight of the product, and usually require labor intensive processes in their implementation. The use of adhesives give rise to environmental concerns, and ohen times the adhe- sives chemically attack the parts onto which they are applied, resulting in a degradation of the mate- rial properties of the parts. Adhesives can be diffi- cult to dispense, so their use in a product's assem- bly can add to the cost and complexity of the manufacturing lines required to assemble the prod- uct, Integrally molded assembly features such as snap- fits and press-fits are conducive to automated assem- bly processes, but their use in designs adds to the cost, cycle time, and maintenance required for the molding tools used to produce the parts.

  One method of assembly that addresses these problems is ultrasonic welding. Ultrasonic welding has many advantages over the assembly methods listed above. First, there is no need for extra com-

ponents, thus no additional part count, cost or weight is incurred. Secondly, the e...