METHOD OF ULTRASONICALLY WELDING RIM PARTS USING THERMOPLASTIC INSERTS
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-18
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.