PMMA激光融化三维瞬态温度场数值模拟  

Numerical Simulation of Three-Dimensional Transient Temperature Field for Laser Melting PMMA

作　　者：谭文胜[1,2] 周建忠[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]常州信息职业技术学院,江苏常州213164

出　　处：《中国激光》2015年第B09期102-109,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金（51175236）、江苏省普通高校研究生科研创新计划资助项目（1011110008）、江苏省第四期“333工程”资助项目、常州市科技计划应用基础研究项目（CJ20140003）

摘　　要：为了预测和控制激光融化成型过程的聚合物温度变化，基于热传递和能量守恒原理，建立CO2激光扫描辐照聚甲基丙烯酸甲酯（PMMA）有限元分析模型，模拟低功率CO2激光扫描辐照的PMMA试样融化过程，分析激光功率、扫描时间、扫描速度和光斑直径等激光参数对试样三维瞬态温度场影响，研究激光参数和试样温度变化之间的内在关系。模拟结果表明，试样最高温度呈波浪式增长，最低温度呈近似线性增长，随扫描时间增加温度差增大；选择适当激光参数，试样基体能够控制在软化或融化温度范围，模拟结果与激光融化成型实验相符合，为聚合物激光融化机制及其成型工艺研究提供了参考依据。In order to predict and control the polymer temperature field of laser melting molding process, the finite element analysis model of CO2 laser scanning irradiation polymethylmethacrylate （PMMA） is built based on the principles of heat transfer and energy balance. Numerical simulation of the laser melting process of the sample is carried out at low power CO2 laser scanning irradiation, the effects of laser parameters such as laser power, scanning time, scanning speed and spot diameter on samples three-dimensional transient temperature field are investigated, and the intrinsic relationship between laser parameters and sample temperature is analyzed. Simulation results show that the highest temperature of the sample wavily increases and the minimum temperature linearly increases, the temperature difference increases with scanning time increasing, and the sample substrate can be controlled at softening temperature or melting range to select appropriate parameters of the laser. The simulation results are in good agreement with the experimental research of the laser melting and molding, which can provide a reference to study the mechanism of polymer laser melting and molding process embodiments.

关 键 词：激光技术 CO2激光 扫描辐照 PMMA融化温度 数值模拟 

分 类 号：TN249[电子电信—物理电子学]