喷射式精密点胶阀的设计及分析
发布时间：2018-07-14 18:49
【摘要】：流体点胶技术是以一种可控的方式对胶液进行精确分配的过程。微电子封装中贴片、晶片打标、底部填充等重要过程都需要流体点胶技术的支持，以实现精确稳定的电子封装。为了适应微电子技术的发展需求、提高生产效率及点胶质量，点胶技术正逐渐不可避免的由接触式点胶技术向非接触式点胶技术转变。本文对流体点胶技术进行了综述分析，并设计了一种基于压电陶瓷驱动的喷射式点胶阀。 首先，分析影响流体喷射过中液滴形成的主要因素，，分析了胶滴形成机理。根据质量守恒定律和动量守恒定律对粘性不可压缩流体的层流运动建立了控制方程，利用VOF模型追踪喷射过程中液体表面在空气中变化并形成液滴的过程，并根据连续表面力法(CSF)描述气相与液相间的表面张力作用。分别分析了供料压力、撞针运动、表面张力系数以及粘度等因素对流体喷射过程中液滴体积、拉伸长度、断裂时间以及喷射速度等参数的关系。此外，还分析了流体喷射过程中卫星滴形成的原因，提出了判断卫星滴的初步依据。 其次，本文重点对桥式铰链位移放大机构进行了分析，基于伪刚体模型与弹性梁模型推导了铰链机构的放大倍数公式及输入刚度，并且将理论结果与有限元仿真结果进行对比，最后利用粒子群算法得到桥式铰链机构的优化解，利用有限元工具进行了模态分析。 最后，本文设计和制作了基于压电陶瓷驱动的喷射点胶阀，完成了流体喷射点胶系统平台的搭建。利用实验分析胶液粘度、撞针位移、供料压力等条件对流体喷射的影响规律，并与数值计算结果进行对比。实验证明压电驱动喷射点胶系统具有良好的点胶性能。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH134
本文编号：2122627
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH134
【参考文献】
相关期刊论文 前7条
1 李枚;微电子封装技术的发展与展望[J];半导体杂志;2000年02期
2 王义贤;;半导体集成电路封装用环氧树导电胶概论[J];电子工业专用设备;2007年02期
3 沈正湘,李涵雄,丁汉,韩雷;电子封装中的点胶过程分析和控制[J];控制工程;2005年05期
4 张红光;董守平;姜雪梅;;剪切或拉伸流场中液滴的变形和破裂准则[J];科学技术与工程;2006年24期
5 魏大忠,张人佶,吴任东,周浩颖;压电微滴喷射装置的设计[J];清华大学学报(自然科学版);2004年08期
6 许立宁;崔大付;;新型压电微喷的研制[J];微细加工技术;2007年02期
7 王勇;崔大付;张璐璐;;新型纳升级点样微喷系统的研制[J];仪表技术与传感器;2008年05期
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