45~#钢光纤激光毛化数值模拟及实验研究

发布时间：2018-03-14 08:19

本文选题：激光技术　切入点：激光毛化　出处：《激光技术》2017年06期 　论文类型：期刊论文

【摘要】：为了在模具上加工出特定的毛化形貌和尺寸,采用计算流体力学软件Fluent探究形貌成型机理,建立了激光毛化过程3维瞬态模型。考虑热传导、热对流、材料热物性参量等影响因素,采用焓法处理固液相变移动边界,通过用户自定义函数加载激光热源,计算得出熔池温度场与流场。基于数值模拟,采用单因素轮换法进行了毛化工艺试验,研究了激光功率密度、脉宽两因素对毛化形貌、几何参量的影响。结果表明,激光功率密度在2.04×104W/mm2~3.57×104W/mm2,脉宽在100μs~1000μs之间;以氮气作为辅助气体,可获得球冠状、凹顶球冠状、M状3种形貌。该结果对模具毛化种类具有指导意义。
[Abstract]:In order to process the specific shape and size of the wool on the mould, a 3D transient model of laser fusifying process was established by using the computational fluid dynamics software Fluent to explore the shaping mechanism. The heat conduction and heat convection were considered. The enthalpy method is used to deal with the moving boundary of solid-liquid phase transition, and the laser heat source is loaded by the user-defined function. The temperature field and flow field of the molten pool are calculated. The effects of laser power density and pulse width on the morphology and geometric parameters were studied by single factor rotation method. The results show that the laser power density is 2.04 脳 10 4 W / mm 2 and the pulse width is between 100 渭 s and 1000 渭 s, the laser power density is 2.04 脳 10 4 W / mm 2 and the pulse width is between 100 渭 s and 1000 渭 s. Three kinds of morphologies such as spherical coronal shape and concave crown shape were obtained.
【作者单位】：江苏大学机械工程学院;
【基金】：国家自然科学基金资助项目(51375211;51305168) 江苏省工业支撑基金资助项目(BE2014115)
【分类号】：TN249

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