激光熔融噴射焊接系統(tǒng)的設(shè)計(jì)及實(shí)驗(yàn)研究
[Abstract]:With the increase of the number of pins and the decrease of pin spacing, modern electronic manufacturing industry has put forward higher requirements for solder materials and equipment processes. At present, the mainstream materials in the market lead-free solder has high melting point, poor wettability and other shortcomings. The traditional reflow welding and manual tin welding processes are complex and inefficient, and the quality of solder joint is difficult to guarantee and the rate of good products is low when using lead-free solder. In order to solve the above problems, a laser melt jet welding system is proposed in this paper. The new non-contact spray welding technology is used to improve the welding quality and efficiency, to meet the needs of the modern electronic manufacturing industry, and to promote the development of the industry. The specific research contents are as follows: firstly, the factors affecting the material, diameter and physical properties of the tin ball are determined, and the laser energy absorption rate of the tin ball to the laser and the thermal radiation of the tin ball due to thermal radiation are analyzed theoretically during the heating and melting process of the tin ball. Heat conduction to the outside heat loss; The effects of surface tension, nozzle structure parameters, working pressure and tin ball size on the average velocity of molten tin ball were investigated, and the factors affecting the maximum spreading diameter and rupture spatter of molten tin ball were analyzed. On the basis of theoretical analysis, the finite element analysis software is used to simulate the heating process of the tin ball, the spray and welding process of the molten tin ball, the structure parameters of the nozzle, the wetting angle between the nozzle and the molten tin ball, and the working gas pressure. The operation time of the gas, the heating power of the laser and the heating temperature of the tin ball are optimized and analyzed, and the structure and model of the matching parts of the equipment are determined in turn, which lays a foundation for the subsequent structural design of the whole machine. The structure of the laser melt jet welding system is designed, the whole machine is made and the experimental platform is built. The influence of motor speed on the success rate and stability of tin ball transportation is investigated. The optimum motor speed is 0.25 r / s, and the laser melt injection part is tested according to the simulation and theoretical results. The laser output power is 90 W, the laser operating time is 20 Ms, and the working nitrogen pressure is 5 500 Pa. When the working time of nitrogen pressure is 6.2 Ms, the nozzle diameter is 0.5 mm and the diameter of tin ball is 0.76mm, a better solder joint can be formed. On the basis of this parameter setting, the effects of motor speed, working gas pressure and laser heating power on the transport performance of tin ball and the effect of molten tin injection were investigated by single factor method.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG439.4
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