摘要
在激光热成形中工件除了产生期望的弯曲变形外,还会产生非期望变形。尽管在常规热成形中可以不予考虑,但对于成形精度要求较高的工件,这些成形误差不仅会影响工件的装配精度,也会严重影响工件的使用寿命。为了减小成形工件的非期望变形,探讨优化的成形工艺,在分析激光热成形中温度分布与不同位置冷态材料对加热区域约束力变化的基础上,揭示出非期望变形的产生机制,并提出两种新的扫描策略。研究结果表明,选用不同的扫描策略,板材的非期望变形量不同。因此,在实际的工业应用中,需要针对不同的成形要求,选用不同的激光扫描策略,以提高工件的成形精度。
In laser forming, except for the desirable bending deformation, the undesirable deformation is also produced. The undesirable deformation can be ignored in the conventional laser forming, however, for the high precision workpieee, these inaccuracies influence not only the assembly accuracy, but also the operational life. To reduce the undesirable deformation of the forming workpiece and seek for the optimal process technology, the temperature distribution of laser forming and restraining force variation of the surrounding cold material on the heated area are analyzed, the undesirable deformation mechanism is disclosed, and two new scanning strategies are proposed. The results show that the metal plates have the different undesirable deformation under the different scanning strategies. In real industrial applications, the different scanning strategies should he chosen according to the different forming requirements.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2008年第11期1825-1829,共5页
Chinese Journal of Lasers
基金
山东省自然科学基金(Y2007F76)
中国石油大学博士科研基金(Y070306)资助项目
关键词
激光技术
激光热成形
非期望变形
数值模拟
扫描策略
成形精度
laser technique
laser forming
undesirable deformation
numerical simulation, scanning strategy
forming accuracy
