Position Planning And Process Routing Decision For Mechanical Part Based On Tolerance

On the basis of comprehensive analysis for recent research status of process routing decision, binding projects supported by National Natural Science Foundation of China (50275136), State 863 Project of China (2001AA412160) and Natural Science Foundation of Zhejiang (502016), the methodology and technology of position planning and process routing decision is studied.In chapter 1, state-of-the-arts of CAPP and process routing decision are summarized. The relation between position planning, process routing decision and tolerance is discussed. The main contents, general structure scheme of this thesis are given.In chapter 2, geometrical product specifications (GPS) and technologically and topologically related surface (TTRS) theory are introduced. The feature description faced to process routing decision is discussed. The feature technology and feature-based model of mechanical part is studied.In chapter 3, the information of mechanical part is analyzed. Based on the 3D CAD system, the feature-based model of mechanical part faced to process routing decision is structured.In chapter 4, the tolerance constraints of mechanical part is studied. An algorithm for position planning is given based on the analysis of tolerance constraints, DOF (Degree of freedom) constraints, feature's topological relation, etc..In chapter 5, the method of feature's process designing and sequencing is studied on the basis of tolerance constraints analysis. A set of rules is summed up. An algorithm for process routing decision based on tolerance is put forward.In chapter 6, based on the 3D CAD system (SolidWorks), a prototype system for position planning and process routing decision is developed.In chapter 7, the main results and conclusions of this thesis are summarized and the future research work is prospected.