A Method for Analyzing the Accuracy of Parallel Mechanical Assembly Based on Skin Model Shapes
Aiming at the loss of accuracy of assembly accuracy analysis caused by the fact that the spatial distribution characteristics of form deviation are not taken into account in the existing assembly accuracy a-nalysis of parallel mechanical and the calculation of relative positioning deviation of the mating surfaces of parallel connections is not combined with the actual assembly process,this paper firstly proposes a method of calculating the relative positioning deviation of the mating surfaces of parallel connections combined with the assembly process based on the non-gaussian skin shape model.Secondly,based on the Jacobian-torsor model,the Jacobian-non-gaussian skin model shapeis proposed to realize the cumulative analysis of deviation propa-gation for parallel mechanical assembly.Finally,using a straight-toothed bevel gearbox as an example,the fre-quency distributions of the relative error of the shaft intersection angle ΔRα and the relative error of the center distance ΔTd are obtained by monte carlo simulation,and the proposed method can provide theoretical guidance for the tolerance design to guarantee the assembly quality requirements of high-precision mechanical products.
assembly accuracy analysisparallel mechanical assemblynon-gaussian skin model shapesform deviationsspatial distribution characteristics
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