發(fā)布時間：2018-08-19 16:55

【摘要】：快速熔模鑄造(Rapid Investment Casting,RIC)是3D打印技術(shù)與熔模鑄造相結(jié)合而形成的一種間接增材制造金屬零件的生產(chǎn)工藝,它相對于直接增材制造具有工藝成熟、成本低、材料不限、可制造大尺寸零件、不需去除支撐等優(yōu)勢。同時,它也與直接增材制造一樣,能夠制造輕量化的復(fù)雜拓?fù)浣Y(jié)構(gòu)零件。過去的常規(guī)結(jié)構(gòu)零件受限于傳統(tǒng)的減材制造方法,未能更好的進(jìn)行拓?fù)湓O(shè)計,包括基于優(yōu)化算法的拓?fù)鋬?yōu)化設(shè)計以及基于經(jīng)驗知識的晶格化設(shè)計。對傳統(tǒng)結(jié)構(gòu)零件重新進(jìn)行拓?fù)湓O(shè)計,將會充分發(fā)揮RIC工藝的潛能,推動產(chǎn)品設(shè)計與制造模式的變革。本文面向快速熔模鑄造工藝所生產(chǎn)的零件,對其拓?fù)湓O(shè)計(CAD)、結(jié)構(gòu)分析(CAE)以及鑄造工藝分析(CACE,Computer Aided Casting Engineering)進(jìn)行研究,期望探索一種CAD/CAE/CACE集成化方法。主要研究內(nèi)容如下:第一,面向RIC的拓?fù)鋬?yōu)化設(shè)計與分析研究。為了提高RIC零件的拓?fù)鋬?yōu)化設(shè)計效率,提出了一種集成化的拓?fù)鋬?yōu)化設(shè)計方法,并通過機(jī)器人抓手拓?fù)鋬?yōu)化設(shè)計實例進(jìn)行了具體說明;然后采用該方法對飛機(jī)上的某軸承支架進(jìn)行了拓?fù)鋬?yōu)化設(shè)計。第二,面向RIC的晶格拓?fù)湓O(shè)計與分析研究。對航空航天領(lǐng)域的點陣夾芯結(jié)構(gòu)進(jìn)行了參數(shù)分析,并對點陣夾芯結(jié)構(gòu)進(jìn)行了晶格拓?fù)湓O(shè)計和分析,然后將晶格結(jié)構(gòu)用于渦輪葉片的拓?fù)湓O(shè)計中,得到了三種芯子形式的晶格結(jié)構(gòu)渦輪葉片,通過有限元分析表明了該結(jié)構(gòu)具有更高的綜合熱力學(xué)性能。第三,RIC零件的熔模鑄造仿真分析研究。將飛機(jī)上某軸承支架和金字塔點陣夾芯結(jié)構(gòu)分別作為拓?fù)鋬?yōu)化和晶格結(jié)構(gòu)拓?fù)湓O(shè)計的例子,采用ProCAST軟件對充型、凝固過程進(jìn)行了仿真分析,并通過缺陷分析對縮孔縮松進(jìn)行了預(yù)測。通過分析復(fù)雜RIC零件的可鑄造工藝條件,為其鑄造工藝選擇提供了借鑒。
[Abstract]:Rapid investment casting (Rapid Investment casting) is a kind of production technology of metal parts which is formed by the combination of 3D printing technology and investment casting. It has the advantages of mature process, low cost and unlimited material compared with direct material increasing manufacture. Large-size parts can be manufactured without the need to remove support and other advantages. At the same time, it can also be used to manufacture lightweight and complex topological parts, just like direct material adding manufacturing. In the past, the conventional structural parts were limited by the traditional method of material reduction, and failed to do better topology design, including topology optimization based on optimization algorithm and lattice design based on empirical knowledge. Redesigning the topology of traditional structural parts will give full play to the potential of RIC process and promote the innovation of product design and manufacturing mode. In this paper, the topological design of (CAD), structure analysis (CAE) and casting process analysis computer Aided Casting Engineering) are studied for the parts produced by rapid investment casting process. It is expected to explore a method of CAD/CAE/CACE integration. The main contents are as follows: first, topology optimization design and analysis for RIC. In order to improve the efficiency of topology optimization design of RIC parts, an integrated topology optimization design method is proposed and illustrated by an example of robot gripper topology optimization design. Then the method is used to optimize the topology of a bearing support on an aircraft. Second, the design and analysis of lattice topology for RIC. The lattice sandwich structure in aerospace field is analyzed, and the lattice topology is designed and analyzed. Then the lattice structure is applied to the topology design of turbine blade. Three kinds of core structure turbine blades are obtained. The finite element analysis shows that the structure has higher comprehensive thermodynamic performance. The third part of RIC simulation analysis of investment casting. A bearing bracket and a pyramid lattice sandwich structure are used as examples of topology optimization and lattice topology design respectively. The mold filling and solidification process are simulated by ProCAST software. The shrinkage porosity was predicted by defect analysis. By analyzing the casting process conditions of complex RIC parts, this paper provides a reference for the selection of casting process.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG249.5

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