A Comprehensive Method for Specifying Tolerance Requirements for Assemblies

摘要: When mechanical parts are assembled, their dimensional and form variations accumulate statistically propagate kinematically, causing critical assembly features to vary. The main objective of this thesis was relate engineering tolerance requirements manufacturing constraints by means a common model for variation in assemblies. A comprehensive system defining specifications (engineering requirements) analytically predicting developed, which will allow closer control product quality performance. Vector loops were used join relevant dimensions into chains. Closed define the kinematic on assembly. Open constraints. Linearized equations derived from vector solve variations. linearized expressed terms scalar sensitivities known component tolerances. Simplified methods developed determining using nodal coordinates. Eight distinct identified, patterned after ANSI Y14.5-M 1982 standards geometric dimensioning tolerancing. They general enough cover wide range applications. For each case, required loop determined solution procedures have been demonstrated computing comparing results specified limits. new set drawing symbols has also proposed is similar 1982. Chapter