發(fā)布時間：2019-04-24 00:47

【摘要】：選擇性激光燒結(jié)(SLS)打印技術是一種先進的快速制造技術,國內(nèi)外對金屬粉末SLS打印技術進行了研究,但國內(nèi)相關研究相比國外還有一定差距。本課題對金屬SLS打印機結(jié)構(gòu)以及成型質(zhì)量影響因素進行了研究。以改進打印機結(jié)構(gòu)、提高成型件質(zhì)量為目標展開課題研究。對打印機總體結(jié)構(gòu)進行設計,針對現(xiàn)有鋪粉裝置無法克服燒結(jié)過程中金屬粉末“球化飛濺”帶來的影響,對鋪粉裝置進行改進,在鋪粉輥表面增加一層硬質(zhì)橡膠并在鋪粉輥前設置一個一定厚度的刮板。加工零件,組裝出實物樣機,分別使用改進前和改進后的鋪粉裝置在實物樣機上進行測試,結(jié)果表明改進后的裝置可緩解球化飛濺現(xiàn)象,對成型質(zhì)量有提升作用。對測試樣件進行尺寸精度分析,實際尺寸與理論尺寸存在一定偏差,需要對成型質(zhì)量影響因素進行研究以便進一步提升成型質(zhì)量。分析幾何數(shù)據(jù)處理、粉末材料性質(zhì)、成型工藝參數(shù)以及掃描方式對成型質(zhì)量的影響,對各參數(shù)的選取提出建議。研究成型質(zhì)量的評價問題,針對目前沒有能夠全面系統(tǒng)反映出成型件整體質(zhì)量的測試件的現(xiàn)象,設計一種能夠較全面評價成型件整體成型質(zhì)量的測試件,對制定合理的成型質(zhì)量評價模型有一定參考作用,為全面系統(tǒng)地評價成型質(zhì)量奠定基礎。針對國內(nèi)外對金屬粉末三維燒結(jié)溫度場研究較少的現(xiàn)狀,以水霧化鐵粉作為研究對象,對金屬粉末的連續(xù)移動三維瞬態(tài)溫度場進行數(shù)值模擬,對結(jié)果進行分析,有利于掌握燒結(jié)過程中溫度場的動態(tài)分布情況,通過改變燒結(jié)參數(shù)分析影響成型質(zhì)量的工藝因素,對實際的試驗做出理論指導并提供理論依據(jù)。綜上所述,本課題的開展為金屬SLS打印技術進一步研究奠定了一定理論與技術基礎。
[Abstract]:Selective laser sintering (SLS) (SLS) printing technology is an advanced rapid manufacturing technology. The metal powder SLS printing technology has been studied at home and abroad, but there is still a certain gap between domestic and foreign related research. In this paper, the structure of metal SLS printer and the influencing factors of forming quality are studied. In order to improve the printer structure, improve the quality of forming parts as the goal of the research. The overall structure of the printer is designed. In view of the fact that the existing powder laying device can not overcome the influence of "spheroidization spatter" of metal powder in the sintering process, the powder laying device is improved. Add a layer of hard rubber to the surface of the roller and set a thickness scraper in front of the roll. The parts are processed, the prototype is assembled, and the powder laying device is tested on the prototype before and after the improvement. The results show that the improved device can alleviate the spatter phenomenon of spheroidization and improve the molding quality. The dimension precision analysis of the test sample shows that there is a certain deviation between the actual size and the theoretical dimension, so it is necessary to study the influencing factors of the forming quality in order to further improve the forming quality. The influences of geometric data processing, properties of powder materials, forming process parameters and scanning mode on forming quality are analyzed, and some suggestions are put forward for the selection of each parameter. The evaluation of forming quality is studied. Aiming at the phenomenon that there is no comprehensive and systematic test part which can reflect the whole quality of forming part at present, a kind of testing piece which can evaluate the whole forming quality of forming part is designed, which can be used to evaluate the whole forming quality of forming part in a more comprehensive way. It can be used as a reference to establish a reasonable molding quality evaluation model and lay a foundation for the overall and systematic evaluation of molding quality. In view of the lack of research on three-dimensional sintering temperature field of metal powder at home and abroad, the three-dimensional transient temperature field of continuous movement of metal powder is numerically simulated and the results are analyzed by using water-fogged iron powder as the research object. It is beneficial to grasp the dynamic distribution of the temperature field in the sintering process. By changing the sintering parameters, the technological factors affecting the forming quality are analyzed, and the theoretical guidance and theoretical basis are provided for the practical test. In summary, the development of this topic for the further study of metal SLS printing technology laid a certain theoretical and technical basis.
【學位授予單位】：湖北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TF37

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