Unified modeling method of mechanical product tolerance

A modeling method and technology for mechanical products, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of modeling, unable to establish dimensional tolerance, shape tolerance unified model, etc., to eliminate diversity and two. Meaningful, easy-to-build effects

Inactive Publication Date: 2008-09-24
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The current tolerance modeling methods are: 1) CSG-based method; 2) B_rep-based method; 3) B_rep/CSG-based method; 4) variable geometry method; 5) TTRS-based (Topologically and Technologically Related Surface, and technology, Topologically related surfaces) methods, these methods are mainly aimed at the compute

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  • Unified modeling method of mechanical product tolerance
  • Unified modeling method of mechanical product tolerance
  • Unified modeling method of mechanical product tolerance

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Embodiment Construction

[0030] The present invention will be further described now in conjunction with accompanying drawing:

[0031] Take a component of an aircraft (see Figure 5 ) as an example for case analysis. The steps to establish the unified tolerance model of this component by adopting the unified modeling method of mechanical product tolerance of this patent are as follows:

[0032] The first step is to establish a part tolerance meta-model:

[0033] The part tolerance element model established by the extended directed graph is: G(KF, E, T, BT, V), where KF represents a set composed of n key features: KF={kf 1 , kf 2 ,..., kf n}, kf 1 , kf 2 ,..., kf n Represents n key features of parts, which are derived from basic features related to tolerances—points, lines, and surfaces; E represents a set of m tolerance relations connecting n key features: E={e i，j |i,j=1,2,...,n}, e i，j Indicates the key feature kf i , kf j The tolerance relationship between; T indicates the tolerance typ...

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Abstract

The invention relates to a tolerance unified modeling method for a mechanical product, which adopts technologies of graph theory, vectors and characteristics, etc., and implements part tolerance element modeling, part tolerance modeling, assembly fit tolerance modeling and assembly body tolerance modeling layer by layer from bottom to top according to an assembly decomposition structure of the product, thereby realizing the unified modeling of product tolerances. The tolerance unified modeling method of the invention is characterized in that: the part tolerance element model is firstly established; each part tolerance element modeling built by extended directed graphs is adopted, and all the part tolerance element modeling are adopted to establish the part tolerance element models by a summation operation of the extended directed graphs; and each assembly fit tolerance modeling built by the extended directed graphs is adopted to establish a produc tolerance unified modeling. The tolerance unified modeling method for the mechanical product has the advantages of realizing the unified modeling of a dimension tolerance, a shape tolerance, a position tolerance and an assembly matching tolerance of the mechanical product. First, the diversity and the ambiguity of the tolerance models are eliminated; second, an assembly dimension chain and error accumulation analysis can be established conveniently.

Description

technical field [0001] The invention relates to a unified modeling method for mechanical product tolerances, which is used for establishing digital representations of mechanical product tolerances and belongs to the field of mechanical tolerance digitization. Background technique [0002] Tolerance refers to the precision characteristics used to describe the datum, direction of change and amount of change of geometric shape and size; tolerance modeling refers to the computer representation model describing the datum, direction of change and amount of change of geometric shape and size. The information is complete, valid, compatible, computable, etc. The current tolerance modeling methods are: 1) CSG-based method; 2) B_rep-based method; 3) B_rep / CSG-based method; 4) variable geometry method; 5) TTRS-based (Topologically and Technologically Related Surface, and technology, Topologically related surfaces) methods, these methods are mainly aimed at the computer representation o...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张开富李原
Owner NORTHWESTERN POLYTECHNICAL UNIV
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