摘要
本研究模拟CO_(2)连续激光器抛光Ti6Al4V材料的工艺过程,利用可移动的高斯热源模拟激光源,建立有限元三位数值瞬态模型进行模拟实验,来模拟TC4材料表面轮廓的融化与凝固过程,该数值模型耦合了温度场与速度场,研究由于表面张力温度系数而产生的表面张力对抛光熔池的影响,通过改变高斯光源的不同功率强度、扫描速度,来分析对抛光过程中形成的熔池的影响,模拟结果表明:当激光热源功率过大时,易造成熔池尺寸过大,不利于降低材料表面的粗糙度,适当降低扫描速度能有效的降低轮廓峰值的温度梯度大小,从而降低表面张力的作用大小,进而改善熔池尺寸与形状。通过实际抛光实验得出:激光的最佳扫描速度维持在20 mm/s左右,扫描速度过小或者过大都会使抛光样品的表面粗糙度值[WTBX]Ra增加,从而达不到理想抛光效果,且通过实验测试值与数值模型计算值相比较,发现两者数据大致吻合,从而证明了该数学模型的准确性。
This study simulates the process of CO 2 continuous laser polishing Ti6Al4V material,using the movable Gaussian heat source analog laser source,establishing a finite three-digit numerical transient model for simulation experiments,to simulate the melting and freezing process of the surface profile of the TC4 material,which coupled the temperature field with the velocity field,and studied the surface tension of the polished melting pool due to the surface tension temperature coefficient.The effect,by changing the different power strength of Gaussian light source,scanning speed,to analyze the impact on the melting pool formed in the polishing process,the simulation results show that:when the laser heat source power is too large,easy to cause the melt pool size is too large,is not conducive to reducing the roughness of the material surface,appropriately reduce the scanning speed can effectively reduce the height of the peak of the contour,thereby reducing the effect of surface tension,and thus improve the melting pool size and shape.Through the actual polishing experiment,it is concluded that the optimal scanning speed of the laser is maintained at about 20 mm/s,the scanning speed is too small or too large metropolis makes the surface roughness value of the polished sample increase,so as not to achieve the ideal polishing effect,and the experimental test value is compared with the numerical model calculation value,and the data of the two data are roughly consistent,thus proving the accuracy of the mathematical model.
作者
贺国阳
王涛
HE Guo-yang;WANG Tao(College of Mechanical Engineering,Hebei University of Technology,Tianjin 300312,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2021年第5期575-583,共9页
Laser & Infrared
关键词
激光抛光
高斯热源
熔池
温度场
表面张力温度系数
laser polishing
Gaussian heat source
melting pool
temperature field
surface tension temperature coefficient
作者简介
贺国阳(1995-),男,硕士,主要从事激光应用方面的研究工作。E-mail:2060817247@qq.com;通讯作者:王涛(1963-),男,教授,硕士生导师,博士后,主要从事机电设备一体化工作。E-mail:wtao_1@163.com。
