【摘要】：飛機結(jié)構件是構成飛機機體骨架和氣動外形的重要零件,其種類繁多,功能重要。提高飛機結(jié)構件數(shù)控加工效率和加工質(zhì)量,具有重要意義。特征編碼技術和基于模型的定義技術可以提高飛機結(jié)構件數(shù)控加工編程化自動化水平,本文針對此方面開展研究。1、基于CATIA V5,構建飛機結(jié)構件MBD模型,模型包含了設計信息和工藝信息,基于MBD模型提出了飛機結(jié)構件機械加工工序模型的生成流程。2、提出基于圖的飛機結(jié)構件特征識別方法。特征識別對于零件加工工藝路線決策和數(shù)控編程具有重要意義。首先得到飛機結(jié)構件的屬性鄰接圖,去掉屬性鄰接圖中所有代表凸邊的點,得到全凹的鄰接子圖。再去掉鄰接子圖中代表毛坯面的結(jié)點,得到零件加工特征子圖,將加工特征子圖與預定義的特征子圖匹配,實現(xiàn)飛機結(jié)構件特征識別。3、提出特征加工元的概念及加工元編碼方法。將飛機結(jié)構件加工特征分解為獨立的加工元,提出加工元編碼系統(tǒng)的結(jié)構,將加工元分類并編碼,制定加工元成組工藝。闡述加工元編碼在飛機結(jié)構件設計生產(chǎn)中的意義,構建加工元信息模版并重點闡述加工元排序的目的和方法。從飛機結(jié)構件加工材料、加工方式、加工參數(shù)、機床和夾具和加工刀具等幾方面分析了飛機結(jié)構件的加工工藝,引入非幾何信息指導飛機結(jié)構件工藝決策,提出基于編碼的飛機結(jié)構件數(shù)控加工工藝流程。4、基于CATIA V5,結(jié)合MBD技術和成組技術,應用CAA二次開發(fā)平臺,開發(fā)飛機結(jié)構件數(shù)控加工系統(tǒng)。該系統(tǒng)由特征識別模塊、CAPP工藝決策模塊和數(shù)控編程模塊組成。該系統(tǒng)的開發(fā),能有效的實現(xiàn)飛機結(jié)構件工藝信息的提取,在一定程度上提高了飛機結(jié)構件工藝決策的能力,實現(xiàn)了飛機結(jié)構件數(shù)控加工的自動化。
[Abstract]:Aircraft structure is an important part of aircraft frame and pneumatic shape, which has many kinds and functions. It is of great significance to improve the NC machining efficiency and machining quality of aircraft structural components. Feature coding technology and model-based definition technology can improve the level of NC machining automation of aircraft structural parts. 1. Based on CATIA V5, the MBD model of aircraft structural parts is constructed. The model contains design information and process information. Based on MBD model, the generation flow of machining process model of aircraft structural parts is proposed. 2, the feature recognition method of aircraft structural parts based on graph is proposed. Feature recognition plays an important role in process route decision-making and NC programming of parts. Firstly, the attribute adjacent graph of the aircraft structure is obtained, and all the points representing the convex edge in the attribute adjacent graph are removed, and the fully concave adjacent subgraph is obtained. Then the node that represents the blank surface in the adjacent subgraph is dropped, and the machining feature subgraph of the part is obtained, and the machining feature subgraph is matched with the predefined feature subgraph to realize the feature recognition of aircraft structural parts. 3, The concept of feature machining element and the coding method of machining element are put forward. The machining features of aircraft structural parts are decomposed into independent machining elements, and the structure of machining element coding system is put forward. The machining elements are classified and encoded, and the processing element group technology is worked out. This paper expounds the significance of machining meta-coding in the design and production of aircraft structural parts, constructs the processing meta-information template, and focuses on the purpose and method of machining element sequencing. The processing technology of aircraft structural parts is analyzed from the aspects of processing materials, machining methods, machining parameters, machine tools, fixtures and machining tools, and non-geometric information is introduced to guide the process decision of aircraft structural parts. The NC machining process of aircraft structural parts based on coding is put forward. 4. Based on CATIA V5, combined with MBD technology and group technology, the NC machining system of aircraft structural parts is developed by using CAA secondary development platform. The system consists of feature recognition module, CAPP process decision module and NC programming module. The development of the system can effectively realize the extraction of process information of aircraft structural parts, improve the ability of process decision-making of aircraft structural parts to a certain extent, and realize the automation of NC machining of aircraft structural parts.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V260.6

【參考文獻】

相關期刊論文 前1條

1 劉曉平;吳敏;金燦;;采用圖分解的特征識別算法研究[J];工程圖學學報;2010年01期

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本文編號：2475241