New Production Cost-Tolerance Models for Tolerance Synthesis

Abstract

Several new production cost-tolerance models and a hybrid-model tolerance optimization formulation for tolerance synthesis are presented. These new models are introduced based upon the empirical cost-tolerance data of typical production processes, including hole producing, turning, milling, grinding and casting. The introduced models fit empirical cost-tolerance data with considerably less errors, and provide more reliable results for tolerance synthesis. In addition, the hybrid-model tolerance optimization formulation provides further modeling error reduction. The systematic evaluation of various cost-tolerance models provides model selection guidelines for tolerance synthesis. A typical tolerance design example is used to illustrate the method.

Modeling of Product Life-cycle Knowledge and Data for an Intelligent Concurrent Design System

“…During the past years, the author has devoted the efforts on the development of an intelligent concurrent design system that supports the activities in all product development life-cycle aspects (Xue and Dong, 1993;Dong, Hu, and Xue, 1994;Xue and Dong, 1994;Xue, Rousseau, and Dong, 1996;Xue, 1997;Xue and Dong, 1997).…”

“…Due to the large size of feature library, a design-function based design feature coding system and a manufacturing-function based manufacturing feature coding system were introduced for organizing feature library and for automatically generating design candidates and planning production process (Xue and Dong, 1997). Since production cost is a key measure for evaluating design from manufacturing point of view, the cost models considering different production processes and tolerance requirements were then developed (Dong, Hu, and Xue, 1994). An optimization model was developed for achieving the design with the best tradeoff between functional performance and production cost (Xue, Rousseau, and Dong, 1996).…”

Optimal Tolerance Allocation Based on Fuzzy Comprehensive Evaluation and Genetic Algorithm

“…Mathematical expression Reference [16,19] Discrete Model (discrete) [17,19] Combined reciprocal powers and exponential model (combined RP-E) minimising costs method, the machining costs are taken into account, but it is difficult to determine the cost-tolerance relationship for every machining process. In fact, the designer can evaluate a non-uniform cost-tolerance relationship only according to previous experience.…”

Deformation and stress of a composite–metal assembly

“…When the WC method is used, the assembly variation is found by adding the maximum/minimum variations of the parts [6,7] [6,7]. A more realistic variation analysis is known as the RSS method, which is based on Uncertainty Propagation Law.…”