板料激光弯曲的屈曲机理的研究

摘要

介绍了激光弯曲的三种成形机理：温度梯度机理、增厚机理、屈曲机理。由于不进行预弯曲板料经激光束扫描后，仍可产生背向激光束的弯曲变形，针对这一现象，用有限元方法分析了其成形过程中温度场、应变场的变化，提出其成形机理仍属于屈曲机理，并作出了相应解释。通过实验与计算的方法，研究了反向弯曲角度与光束扫描速度的关系。%Three laser bending mechanisms,temperature mec ha nism,bucklingmechanism and upsetting mechanism,are introduced.After being scanned,the sheet that isn’t pre-bent can still obtain the bending towards the laser beam.Aiming at this phenomenon,temperature fields and strain fields in laser bending are numerically analyzed by finite element method,it is preserted that its forming mechanism still belongs to buckling mechanism,and the reason is explained.The relationship between bending angles and scanning velocity of the laser beam is studied numerically and experimentally.