摘要
研究了6 mm和9 mm两种厚度的钢板在不同激光工艺参数下扫描次数对激光弯曲成形过程的影响。利用三维热力耦合有限元(FEM)模型模拟计算了激光多次扫描弯曲成形过程的温度场、应力场和弯曲角度的变化。测量了成形过程中温度和弯曲角度的变化,模拟结果与实验结果符合较好。模拟结果表明,每次扫描过程中温度场变化基本相同,残余应力和钢板弯曲角度随激光扫描次数的增加而增大。随着扫描次数的增加,6 mm厚钢板的弯曲角度增量减小,而9 mm厚钢板的弯曲角度呈线性增大。激光工艺参数影响钢板下表面的应变强化程度,在不同的激光工艺参数下不同厚度钢板的弯曲角度随扫描次数的增加变化规律不同。
The influence of scanning passes on laser bending process was studied for the plates with 6 mm and 9 mm thickness at different laser parameters. A three-dimensional coupled thermo-mechanical finite element method （FEM） model was developed to calculate the variation of temperature field, stress field and bending angle during multiple-irradiation laser bending process. Real-time temperature and bending angle were measured. The simulation results were in agreement with the experimental results well. The simulation results showed that the temperature distribution was similar between each irradiation. Residual stresses and bending angle were increasing with the increase of laser scanning passes. The bending angle of 6 mm thickness plate decreased as the irradiation number increasing, while that of 9 mm thickness plate increased linearly. Laser parameters affected the extent of strain hardening on the underside of the steel plate. Under different laser parameters, the bending angle of various thickness plates has dissimilar relationship with the laser scanning passes.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2007年第12期1721-1725,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(50075013)资助项目
关键词
激光技术
激光弯曲成形
数值模拟
扫描次数
laser technique
laser bending
numerical simulation
scanning passes
