發(fā)布時間：2018-07-14 18:49

【摘要】：流體點膠技術(shù)是以一種可控的方式對膠液進(jìn)行精確分配的過程。微電子封裝中貼片、晶片打標(biāo)、底部填充等重要過程都需要流體點膠技術(shù)的支持，以實現(xiàn)精確穩(wěn)定的電子封裝。為了適應(yīng)微電子技術(shù)的發(fā)展需求、提高生產(chǎn)效率及點膠質(zhì)量，點膠技術(shù)正逐漸不可避免的由接觸式點膠技術(shù)向非接觸式點膠技術(shù)轉(zhuǎn)變。本文對流體點膠技術(shù)進(jìn)行了綜述分析，并設(shè)計了一種基于壓電陶瓷驅(qū)動的噴射式點膠閥。 首先，分析影響流體噴射過中液滴形成的主要因素，，分析了膠滴形成機(jī)理。根據(jù)質(zhì)量守恒定律和動量守恒定律對粘性不可壓縮流體的層流運動建立了控制方程，利用VOF模型追蹤噴射過程中液體表面在空氣中變化并形成液滴的過程，并根據(jù)連續(xù)表面力法(CSF)描述氣相與液相間的表面張力作用。分別分析了供料壓力、撞針運動、表面張力系數(shù)以及粘度等因素對流體噴射過程中液滴體積、拉伸長度、斷裂時間以及噴射速度等參數(shù)的關(guān)系。此外，還分析了流體噴射過程中衛(wèi)星滴形成的原因，提出了判斷衛(wèi)星滴的初步依據(jù)。 其次，本文重點對橋式鉸鏈位移放大機(jī)構(gòu)進(jìn)行了分析，基于偽剛體模型與彈性梁模型推導(dǎo)了鉸鏈機(jī)構(gòu)的放大倍數(shù)公式及輸入剛度，并且將理論結(jié)果與有限元仿真結(jié)果進(jìn)行對比，最后利用粒子群算法得到橋式鉸鏈機(jī)構(gòu)的優(yōu)化解，利用有限元工具進(jìn)行了模態(tài)分析。 最后，本文設(shè)計和制作了基于壓電陶瓷驅(qū)動的噴射點膠閥，完成了流體噴射點膠系統(tǒng)平臺的搭建。利用實驗分析膠液粘度、撞針位移、供料壓力等條件對流體噴射的影響規(guī)律，并與數(shù)值計算結(jié)果進(jìn)行對比。實驗證明壓電驅(qū)動噴射點膠系統(tǒng)具有良好的點膠性能。
[Abstract]:Fluid dispensing is a process of accurate distribution of glue in a controllable manner. In order to achieve accurate and stable electronic packaging, the important processes of microelectronic packaging, such as patch, chip marking, bottom filling and so on, need the support of fluid dispensing technology. In order to meet the needs of the development of microelectronic technology and improve the production efficiency and dispensing quality, the dispensing technology is gradually changing from contact dispensing technology to non-contact dispensing technology. In this paper, fluid dispensing technology is reviewed and analyzed, and an injection dispensing valve driven by piezoelectric ceramics is designed. Firstly, the main factors that influence the formation of droplets in fluid jet are analyzed, and the formation mechanism of colloidal droplets is analyzed. According to the law of mass conservation and momentum conservation, the governing equation of laminar flow of viscous incompressible fluid is established. The VOF model is used to track the change of liquid surface in air and the formation of droplets. The surface tension between gas phase and liquid phase is described by continuous surface force method (CSF). The effects of feeding pressure, pin motion, surface tension coefficient and viscosity on the parameters of droplet volume, tensile length, fracture time and injection velocity were analyzed respectively. In addition, the reasons for the formation of satellite droplets in the process of fluid injection are analyzed, and the preliminary basis for judging the satellite droplets is put forward. Secondly, the paper mainly analyzes the bridge hinge displacement amplification mechanism. Based on the pseudo-rigid body model and elastic beam model, the magnification formula and the input stiffness of the hinge mechanism are derived, and the theoretical results are compared with the finite element simulation results. Finally, the optimal solution of the bridge hinge mechanism is obtained by particle swarm optimization, and the modal analysis is carried out with finite element method. Finally, this paper designed and fabricated the spray dispensing valve based on piezoelectric ceramic drive, and completed the platform of fluid spray dispensing system. The effects of viscosity, pin displacement and feeding pressure on the fluid injection were analyzed experimentally, and the results were compared with the numerical results. Experimental results show that the piezoelectric spray dispensing system has good dispensing performance.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH134

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