基于規(guī)則推理和多層實例庫的組合夾具設計系統(tǒng)開發(fā)
[Abstract]:As an important process equipment in aero-engine manufacturing system, modular fixture shortens the preparation period of production. However, the machining process of aeroengine parts is more complex, resulting in the corresponding modular fixture has a certain structural complexity. On the other hand, the design changes frequently in the initial stage of aero-engine development, and technicians often need to assemble the modular fixture repeatedly in the work site. The application of computer aided fixture design (CAD) technology enables the user to assemble the fixture in the computer environment, but there are still some problems such as low standardization and so on. Based on this, combined with the characteristics of modular fixture structure, this paper divided the modular fixture cases into hierarchical types, and based on the rule reasoning and case-based design technology, A fixture assembly design method based on rule-based reasoning and multi-layer case library is proposed, and a corresponding modular fixture design system is developed to improve the assembly efficiency in virtual environment of modular fixture. The main work and research contents of this paper are as follows: (1) A rule-based reasoning model of clamping scheme is proposed, and the rule base of workpiece clamping scheme is established. The location and clamping information of modular fixture is obtained by rule reasoning. (2) geometric modeling is carried out by using part family table method, and the multi-layer case library of "product-component-component" of modular fixture is constructed, which realizes the storage of 3D model and related information of the case. (3) in order to better express the index features of modular fixture product level examples, a 17-bit coding system is developed. Part of the input information of the system comes from the rule reasoning module, and the generated code can describe the case index information more comprehensively. (4) the product level case of the modular fixture is retrieved by using the nearest neighbor strategy. On the basis of component level and component level instance library, the rapid assembly of functional components and components is realized to complete the assembly design of modular fixture products. (5) C and NX Open API development tools are used. Based on the NX UG platform, a modular fixture design system based on rule reasoning and multi-tier case library is developed.
【學位授予單位】:南京航空航天大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG754
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