Rowzee, Mary E.; Holmes, Richard K. (1986, ASQC) TRW Inc., Washington, DC; SMTC Corporation, Warren, MI
In the early stages of advanced product design, the design of engiener must determine the design specification of an assembly parameter for fit or function. This specifications may be derived to satisfy any or all vital product criteria, for example, durability, reliability, manufacturability, function, and ccosmetic appearance. Once this specification has been determined for an assembly parameter, the component, sub-assembly, and assembly processes must be assigned tolerances that will allow the final assembly parameter to be met in production.Traditional tolerancing or variation analysis in advance design have been ineffective in their predictive abilities when working with complex assembly systems. The inability to adequately specify and optimize design tolerances and functional tolerance schemes may be manifested as chronic assembly quality problems. Even though all components are within their design tolerances, the assembly does not meet design intent.This paper will show, through actual application, how a variation simulation modeling technique is being used to develop tolerance schemes in advance designs that predict and prevent assembly problems before production begins. With geometric dimensioning and tolerancing becoming a fundamental part of the product design process, there is even a greater need to evaluate the interaction of components in assembly processes. The variation simulation modeling technique will be demonstrated to show its ability to evaluate and optimize tolerance schemes and statistically predict resultant parameters.