连续/脉冲激光再制造温度场有限元分析与试验验证  

Finite Element Analysis and Test Verification for Thermal Field of CW/Pulsed Laser Remanufacture

作　　者：任维彬[1,2] 董世运 徐滨士[1] 王玉江[1] 方金祥[1] 刚肖[1] Ren Weibin Dong Shiyun Xu Binshi Wang Yujiang Fang Jinxiang Gang Xiao(National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China No.65589 of PLA, Wafangdian 116300, China)

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室 [2]65589部队

出　　处：《稀有金属材料与工程》2017年第9期2487-2492,共6页Rare Metal Materials and Engineering

基　　金：国家"973"计划(2011CB013403)

摘　　要：以减少成形过程热输入,控制热影响区分布及成形层应力分布状态为目标,通过"生死单元"的有限元分析方法动态模拟激光再制造成形过程,对比分析连续/脉冲模式激光再制造温度场,采用非接触式红外测温仪验证分析结论,并就连续和脉冲工艺进行再制造成形对比试验验证。分析和试验结果表明:脉冲模式优化工艺参数为激光功率1.2 k W,光斑直径3 mm,扫描速度5 mm/s,单道成形层宽度3.2 mm,脉冲激光脉宽10 ms,占空比1:1;相同成形工艺和散热条件下,连续输出模式下多层成形层熔池温度最大值约为1400℃,较脉冲模式约高出170℃,且具有更大的热输入及热影响区范围,相关工艺及方法为叶轮叶片激光再制造提供分析和借鉴。The forming course of laser remanufacture was simulated dynamically in the method of finite element analysis in order to reduce the heat input of the forming course and control the distribution of heat-affected zone as well as the stress distribution of the forming layers. The temperature field of the laser remanufacture for CW/pulsed laser was analyzed,and the non-contacting infrared thermometer was taken to validate the result of the analysis. The related CW/pulsed laser process was compared and validated by the experiment of laser remanufacture forming. The results show that the optimized process parameters of laser remanufacture for pulsed laser are 1.2 k W laser power,3 mm spot diameter,5 mm/s scanning speed,3.2 mm width of the forming layer,10 ms pulse width,and 1：1 duty ratio. Under the same condition of forming and heat dissipation,the temperature maximum of laser remanufacture molten pool is about 1400 °C,which is 170 °C higher than that of the pulsed laser. The heat input and heat-affected zone for CW laser remanufacture is bigger than the pulsed laser remanufacture＇s. The related process could be taken as reference for the remanufacture of impeller blades.

关 键 词：脉冲激光 温度场 有限元分析 激光再制造 

分 类 号：TN249[电子电信—物理电子学]