Automatic assembly dimension chain generation method based on Jena

An assembly size and chain automatic technology, applied in configuration CAD, geometric CAD, etc., can solve the problems that affect the accuracy of the size chain, and the information description of product assembly model is difficult to transmit and share in the computer, so as to ensure reusability, The effect of strong applicability

Pending Publication Date: 2022-01-07
GUILIN UNIV OF ELECTRONIC TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current research on dimensional chains, there is a problem that the information description in the product assembly model is difficult to transmit and share in the computer, which affects the accuracy of dimensional chain generation

Method used

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  • Automatic assembly dimension chain generation method based on Jena
  • Automatic assembly dimension chain generation method based on Jena
  • Automatic assembly dimension chain generation method based on Jena

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Embodiment Construction

[0013] to attach figure 1 The three-dimensional assembly model of shown bolt assembly is example, and technical scheme of the present invention is described further, and its concrete steps are as follows:

[0014] Step A: Construct the product GD&T (Geometric Dimensioning and Tolerancing) semantic representation model; its model includes assembly class, part class, label class, geometric element class, and ring class, as shown in Appendix 1.

[0015] Step B: extract product GD&T information, and generate corresponding assertion sets; according to the GD&T semantic representation model built in step A, extract relevant information in the product assembly model through the NXOPEN interface provided by NX10, and attach image 3 Parts C1-C8 are shown as an example for analysis. The generated assertion set includes the assertion formula set A(8)D representing labeling information and the assertion formula set A(8)C representing the spatial relationship between geometric elements: ...

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Abstract

The invention discloses an automatic assembly dimension chain generation method based on Jena. In order to solve the problem that information description in a product assembly model is difficult to transmit and share in a heterogeneous system, a tolerance semantic representation model is constructed and a Jena rule of related semantics is established by utilizing the advantage that semantic sharing and rule description in a real sense can be realized by an ontology; therefore, assembly dimension chain information semantics naturally formed in the structural design stage are obtained through knowledge reasoning. According to the method, a closed loop naturally generated in a structural design stage is inferred by using a Jena rule, a corresponding size chain is searched through a shortest path method, and then basic sizes of an increased loop, a reduced loop and the closed loop are inferred. According to the invention, a computer can automatically generate a reasonable dimension chain according to the assembly body model, and a method is provided for high intelligence of automatic generation of the assembly dimension chain.

Description

technical field [0001] The invention belongs to the technical field of computer-aided tolerance design (CAT), and in particular relates to an automatic generation method of an assembly dimension chain based on Jena general reasoning rules. Background technique [0002] The automatic generation of the assembly dimension chain refers to the expression of functional equations in the computer to provide the basis for the accurate calculation of the dimension chain. Therefore, the automatic generation of the dimension chain is a technical problem that cannot be ignored. Meeting certain assembly quality requirements is not only related to the machining error of each part It is related, and it is also related to assembly positioning constraints. Computer-aided tolerance design is an important part of computer integrated manufacturing technology, mainly including tolerance modeling, automatic generation of dimensional chain, tolerance analysis and tolerance synthesis. The assembly ...

Claims

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Application Information

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IPC IPC(8): G06F30/10G06F111/20
CPCG06F30/10G06F2111/20
Inventor黄美发罗民宏李健
OwnerGUILIN UNIV OF ELECTRONIC TECH