Geometric Deviation Representation and Variation Propagation Modeling in Multistage Machining Processes
The development of 3D manufacturing variation propagation model for multistage machining processes(MMPs)plays an important role for estimating the dimensional and geometric quality of machined part,monitoring the machining processes and diagnosing the variation sources,and realizing process planning evaluation and selection.In this paper,after the error sourc-es and their propagation modes in the part machining processes are analyzed,the differential motion vectors are employed to de-scribe locating datum-,fixture-,and machining-induced variations,a series of coordinate transformations of variation sources are used to realize the deviation accumulation and transformation,the mathematical relationship between the key product charac-teristics and various machining process parameters is established,so as to realize the quantitative analysis of error propagation,error accumulation and coupling,and establish the linear explicit Stream of Variation model(SoV)of multistage machining pro-cesses.The effectiveness of the proposed model is verified by a case study.
万方数据
维普
