高频感应钎焊中电源频率的优化选择

Optimization selection of power source frequency in high frequency induction brazing

在高频感应钎焊的过程中,要获得良好的钎焊接头,必须要根据接头材料的物理性能选择合适频率的高频电源,采用计算机数值分析手段建立了感应加热电源及其频率范围的选择数值分析模型。研究表明,数值解析法可以作为高频感应钎焊感应加热设备设计的重要方法。在对高频电源电流频率等参数的选择时,利用数值解析模型所得到的解析近似解进行频率选择比传统经验公式更精确。因为后者由平面电磁波在导电媒质中的传播特性导出,更适合于板状结构感应加热时频率的选择。而对于管状或其它复杂形状,利用数值解析解可以较好地对高频电源的频率进行优化选择。

Appropriate frequency of high frequency power source shoulded be selected to obtain perfect soldered joint during high frequency induction brazing according to the physical performance of joint materials. Numerical selection model for the frequency and its arrange of high frequency induction heating power source was set up by means of numerical analysis. It showed that numerical analysis can be used as an important artifice for design of high frequency power equipment. Compared the analytical results from the numerical model with that of the traditional formula, it showed that the former is more accurate. Because the latter was derived from the plane electromagnetic wave spreading characteristic in electro-conductive inter-media, it was more suitable for the frequency selection of board structure high frequency induction heating. But for frequency selection of pipe-structure or more complex structure high frequency induction heating, the numerical analytical method will be better.