Fitting tolerance network establishing method

A technology of assembly tolerance and construction method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of tolerance design coordination difficulties, affecting the quality and efficiency of complex mechanical product design, etc.

Inactive Publication Date: 2014-07-16
XIJING UNIV
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Problems solved by technology

However, due to the lack of mature assembly tolerance design tools in the market, this makes the coordination of tolerance design difficult and affects the design quality and efficiency of complex mechanical products

Method used

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  • Fitting tolerance network establishing method
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  • Fitting tolerance network establishing method

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Embodiment Construction

[0047] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0048] The invention mainly solves the design problem of assembly tolerance of complex assemblies, and is used to realize the design of assembly tolerance and tolerance zone type, the construction of assembly tolerance network and the comprehensive optimization design of size and geometric tolerance with the minimum processing cost as the objective function.

[0049] see figure 1 As shown, it is a flow chart of the assembly tolerance design system of the present invention, the realization of the tolerance design system of the present invention builds the three-dimensional assembly model of the product based on the CAD system, and its design process includes:

[0050] Step a, deduce the assembly tolerance type and its corresponding tolerance zone type.

[0051] Firstly, the assembly constraint information of...

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Abstract

The invention relates to a fitting tolerance network establishing method. The fitting tolerance network establishing method includes extracting fitting information of products from a three-dimensional model of the CAD (computer-aided design) system, generating fitting sequences of the product, and establishing a VGC (viscosity gravity constant) network on the basis of the VGC theory; reasoning to generate three fitting tolerance types via the corresponding relation of the VGC and the tolerance types and tolerance type information input from the step a, adding the fitting tolerance types to the VGC network and establishing a fitting tolerance network; displaying fitting sequence generated in the step b, the VGC network and the fitting tolerance network on the CAD system, and outputting the tolerance network information for tolerance optimization and design. The fitting tolerance design system is established on the CAD system platform, and comprehensive design of fitting dimensional tolerance and geometric tolerance is realized by means of information acquired from a product entity model.

Description

technical field [0001] The invention relates to a design method for mechanical assembly tolerances, in particular to a method for constructing an assembly tolerance network. Background technique [0002] In the prior art, tolerance design is an important task of product development, an important link between product functional requirements and manufacturing costs, and involves all stages of product life cycle. Assembly tolerance is an important part of tolerance design, which not only determines the assembly ability and quality of the product, but also affects the manufacturing cost and service life of the product. In the past decades, research on tolerance design has made great progress. In some CAD systems, it is already possible to specify dimensional tolerance values ​​for individual parts. However, there is no standard on how to realize the assembly tolerance design of assemblies, let alone a widely used method. Therefore, how to realize the automatic generation of a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张毅程明科
Owner XIJING UNIV
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