精密螺杆点胶泵点胶仿真分析及试验研究

发布时间：2018-10-23 08:23

【摘要】：随着微电子封装业的蓬勃发展，微电子封装技术被赋予了更高的要求，如封装产品整体尺寸更小、密集程度更高、机械电气连接性能更优异、产品使用寿命更持久等。而作为微电子封装技术中的关键技术——点胶技术，则必须相应地实现驱动方式更精确、响应频率更快速、单点出胶液量更精确，以及胶点重复精度更高等技术要求。目前市场上的大部分点胶技术已很难满足这些要求，而接触式精密螺杆点胶技术作为一种新兴的点胶技术，以其胶点精度高、一致性精度好、适用介质范围广等优点得到了日益密切的关注；目前，这种新兴技术及相关产品，精密螺杆点胶泵，尚被国外技术垄断。因此，对接触式精密螺杆点胶泵进行研究显得尤为重要。本文从如下几个方面对接触式精密螺杆点胶泵进行点胶机理研究和实验研究。首先，本文对国内外常见的点胶技术和对应的点胶产品进行介绍及优缺点分析，着重介绍分析了接触式精密螺杆点胶泵点胶原理的优势及研究现状，并说明本文的研究方向和研究内容；详细分析了精密螺杆点胶泵进行点胶作业的基本过程及整个点胶系统的工作原理，对精密螺杆点胶泵的核心部件转子、定子进行曲线方程、密封机理，以及工作过程中的精度误差分析，提出了影响精密螺杆点胶泵点胶量及点胶精度的因素和原因；根据实际工况，设计一组转子、定子，并进行三维CATIA建模与装配验证，以保证设计和加工的可行性；在转子、定子工作部分的横截面内，利用FLUENT软件对转子、定子密封区域的流体进行流动机理的有限元仿真分析，并深入研究转子转速、胶液粘度，以及转子、定子配合间隙对精密螺杆点胶泵点胶精度的影响规律。其次，，本文分析了精密螺杆点胶泵的结构组成和运动原理，对转子、定子进行了详细的受力分析，得出了实际工况下转子的受力情况；在此基础上，为精密螺杆点胶泵选用合适的轴承和挠性轴，保证设计的力学可行性；设计并制作了精密螺杆点胶泵实验样机；对于构成精密螺杆点胶泵驱动系统的直流微电机、精密齿轮箱做了进一步研究，对二者的结构组成进行阐述，并对直流微电机、精密齿轮箱的速度特性、电流特性、空载背隙特性及效率的影响因素进行分析，得到了电机输出轴转矩和转速关系式；搭建了点胶系统，并对搭建系统的各部分进行分析。再者，详细分析了精密螺杆点胶泵对控制电路的要求，对开环控制方案和闭环控制方案进行说明和分析比对，选取并详细分析了电流转速双闭环控制方案的工作原理和流程；对控制电路中检测信号的增量式编码器进行结构与工作原理的说明；定制了合适的电机驱动器，并设计了精密螺杆点胶泵控制器，对控制器各部分功能做了详细的说明。最后，根据实验要求搭建完整的精密螺杆点胶泵实验平台，分别从胶液粘度、电机转速和供胶压力的角度对精密螺杆点胶泵的点胶性能进行实验测试，分析这些因素对点胶质量精度的影响规律；通过实验得出实验条件下精密螺杆点胶泵样机的性能：在电机两端电压24v的情况下，样机完成一次完整点胶的最短时间为158ms，样机适用胶液粘度从10poise至500poise，最小出胶量为0.0163ml，点胶精度误差控制在±1.2％以内。通过实验结果验证了样机的可行性。
[Abstract]:With the rapid development of microelectronic packaging industry, microelectronic packaging technology has been given higher requirements, such as smaller overall size, higher density, superior mechanical electrical connection performance and longer service life. As a key technology in microelectronic packaging technology, it is necessary to realize more accurate driving mode, more rapid response frequency, more accurate single-point glue solution and higher repeat precision of glue point. At present, most of the glue technology in the market is very difficult to meet these requirements, and the contact type precision screw point glue technology is a new dot glue technology, which has the advantages of high glue point precision, good consistency precision, wide application range and the like, This new technology and related products, precision screw point glue pump, have been monopolized by foreign technology. Therefore, it is very important to study the contact precision screw point glue pump. In this paper, the research and experimental study of a contact-type precision screw-point glue pump are studied in this paper. First of all, this paper introduces the common point glue technology at home and abroad and the analysis of its advantages and disadvantages, and emphatically introduces the advantages and the research status of the principle of the point glue of the contact precision screw point glue pump, and explains the research direction and the research of this paper. In this paper, the basic process of the point glue operation and the working principle of the whole point glue system are analyzed in detail, the rotor and stator of the core component of the precision screw point glue pump are analyzed, the sealing mechanism and the precision error in the working process are carried out. In this paper, the factors and reasons for affecting the glue quantity of the precision screw point gel pump and the precision of the point glue are put forward. According to the actual working condition, a set of rotors and stators are designed, and the three-dimensional CATIA modeling and assembly verification are carried out to ensure the feasibility of design and processing. In the rotor and stator working part, the cross section In this paper, finite element simulation analysis of flow mechanism of fluid in rotor and stator seal area is carried out by FLUENT software, and the influence of rotor speed, viscosity of glue liquid, rotor and stator fit clearance on precision of precision screw point glue pump is studied deeply. Secondly, the structure composition and motion principle of precision screw point glue pump are analyzed, the rotor and stator are subjected to detailed stress analysis, and the force condition of the rotor under actual working condition is obtained. On the basis of this, a suitable shaft is selected for precision screw point glue pump. Bearing and flexible shaft, the mechanical feasibility of design is ensured; the experimental prototype of precision screw point glue pump is designed and manufactured; for the direct current micromotor which constitutes the driving system of precision screw point glue pump, the precision gear box is further researched, the structure composition of both is expounded, and the comparison is made. The influence factors of speed characteristic, current characteristic, no-load back gap characteristic and efficiency of DC micromotor and precision gear box are analyzed, and the relationship between motor output shaft torque and rotating speed is obtained. In addition, the requirements of the precision screw point glue pump to the control circuit are analyzed in detail, the open-loop control scheme and the closed-loop control scheme are explained and analyzed, and the two-loop control scheme of the current rotating speed is selected and analyzed in detail. The working principle and the flow of the detection signal in the control circuit are described; the explanation of the structure and the working principle is carried out on the incremental encoder of the detection signal in the control circuit; a suitable motor driver is customized and a precision screw point glue pump controller is designed to perform the work on each part of the controller; Finally, a complete precision screw point glue pump experiment platform is built according to the experiment requirement, and the glue performance of the precision screw point glue pump is tested by the viscosity of the glue liquid, the rotation speed of the motor and the pressure of the glue supply, and the factors are analyzed. The influence law of the quality precision of the dot glue is obtained. Through the experiment, the performance of the precision screw point glue pump prototype is obtained. Under the condition that the terminal voltage 24v of the motor is 24v, the shortest time of the prototype is 158ms, the viscosity of the prototype is from 10poise to 500poise, and the minimum is the minimum. The amount of glue is 0.0163ml, and the precision of glue is wrong. Difference control is within 1. 2%. Through experiment
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN405

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