Abstract
Manufacturing error and assembly error should be taken into consideration during evaluation and analysis of accurate product performance in the design phase. Traditional tolerance analysis methods establish error propagation model based on dimension chains with tolerance values being regarded as error boundaries, and obtain the limit of target feature error through optimization methods or conducting statistical analysis with the tolerance domain being the boundary. As deviations of the tolerance feature (TF) on degrees of freedom (DOF) have coupling relations, accurate deviations on all DOF may not be obtained, even though these deviations constitute the basis for product performance analysis. Therefore, taking the widely used shaft-hole fit as an example, a pose decoupling model of the axis TF was proposed based on an area coordinate system. This model realized decoupling analysis of any pose of the axis TF within the tolerance domain. As proposed by the authors, by combining a tolerance analysis model based on tracking local coordinate systems, ultimate pose analysis of the closed-loop system, namely the target feature, as well as statistical analysis could be further implemented. This method contributed to analysis of true product performance with arbitrary error in the product design phase from the angle of tolerance, therefore, shortening the product research and development cycle. This method is demonstrated through applying it to a real-life example.
Highlights
Shaft-hole fit is a common form of fitting in rotating mechanical products
As proposed by the authors, by combining a tolerance analysis model based on tracking local coordinate systems, ultimate pose analysis of the closed-loop system, namely the target feature, as well as statistical analysis could be further implemented
Sci. 2018, 8, 0 relationship between fitting parts by the Torsor method. They established error propagation models based on the dimension chain, which regard the tolerance value and clearance value as constrained boundaries for variation in the tolerance feature (TF) through an optimization method or conducting statistical analysis with the tolerance domain being the boundary, so as to realize error analysis of the assembly system [10]
Summary
Shaft-hole fit is a common form of fitting in rotating mechanical products. Dimension error, geometric shape error, and fit error of shafts and holes are important sources of assembly error [1,2,3]. Sci. 2018, 8, 0 relationship between fitting parts by the Torsor method They established error propagation models based on the dimension chain, which regard the tolerance value and clearance value as constrained boundaries for variation in the tolerance feature (TF) through an optimization method or conducting statistical analysis with the tolerance domain being the boundary, so as to realize error analysis of the assembly system [10]. In order to explore a method which establishes the relation between tolerance of part of the dimension chain and performance of the assembly system, TF of shaft-hole fit-axis TF [15] was taken as an example in this paper, to examine a pose decoupling model. Based on the T-Map, the area coordinate system was used in this paper to study a shaft-hole relative pose description method with the existence of tolerance and clearance fit.
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