电子束焊接电子枪电子光学系统设计

Design of electron optical system for electron gun for electron beam welding

电子光学系统的设计是电子束焊接电子枪设计的核心技术.介绍了电子束焊接电子枪电子光学系统的组成,分析了电子束束斑构成的4种主要物理因素.根据局部真空电子束焊接技术的要求,依据已给定的参数,通过计算得到了电子束会聚半角、光路尺寸、磁透镜的参数和结构.在此基础上设计完成的电子枪,达到了1)加速电压60kV,电子束束流134mA,即电子枪功率为8kW;2)电子枪在工件上的束斑尺寸,理论上设计计算直径为1.3mm,用AB试验法实测束斑直径为1.6mm;3)设计完成的电子光学系统满足了局部真空电子束焊接技术应用电子枪的需求;4)设计完成的电子枪集成应用于局部真空电子束焊机.经试验验证,设计完成后的8kW电子枪满足局部真空电子束焊接的要求.

The design of electron optical system is the key technique for design of electron gun used in (electron) beam welding.The composition of this system is introduced,the four kinds of main physical factors of the structure of electron beam spot are analyzed.On the basis of the technical requirement of local vacuum electron beam welding as well as according to the parameters given,the convergent half-angle,dimensions of light route,and parameters and structure of magnetic lens are obtained by means of calculation.So designed electron gun has following parameters and feature:1) accelerate voltage is 60 kV,electron beam current is 134 mA,i.e.the power of the electron gun is 8 kW;2) electron beam spot diameter on the work piece is 1.6 mm;3) electron optical system of electron gun meets the requirements of local vacuum electron beam welding;4) electron gun can be used on the local vacuum electron beam welding equipment.