【摘要】 针对废线路板资源化处理,采用结合拆卸元器件的回收方式,以空气作为熔焊加热介质,采用数值模拟的方式,以流体分析软件FLUENT为工具,研究了熔焊时热风温度、速度和喷嘴(即热风出口)的结构尺寸对加热效率和焊点附近温度场分布的影响.研究发现,最佳热风温度范围为200～230℃,最佳热风速度在7 m/s左右;喷嘴结构尺寸对加热效率和焊点附近的温度场分布产生影响;喷嘴距线路板30 mm时,合理的喷嘴尺寸为喷嘴上底直径D在9 mm左右,喷嘴α角在20°～30°之间,喷嘴高度h在4 mm左右.更多还原

【Abstract】 A method of dismantling electronic components in waste PCBs resource treatment process is proposed.Air is used as the desoldering heating medium,and the process of desoldering is simulated by fluid software-Fluent.The factors of hot blast temperature and speed and the structure of nozzle are analyzed.Results show that the optimum hot blast temperature is 473-503 K and speed is about 7 m/s.Meanwhile,the structure of nozzle not only influences the heating efficiency,but also the temperature field distribution.Reasonable sizes of the nozzle are 9 mm in diameter,20°-30° in angle of α,and 4 mm in height,when the distance from the nozzle to PCB is 30 mm.更多还原